TWI608222B - Optical measuring device - Google Patents

Description

Optical measuring device

The present invention relates to an optical measuring device.

Patent Document 1 discloses an inspection apparatus for performing optical inspection of a plurality of LEDs (Light Emitting Diodes).

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2013-11542

However, in the device disclosed in Patent Document 1, there is a case where light emitted from other LEDs due to light emission of the LED to be inspected is detected, and therefore there is still room for improvement in measurement accuracy.

The present invention has been made in view of the above circumstances as a problem. That is, an object of the present invention is to provide an optical measuring apparatus capable of measuring the optical characteristics of a light-emitting element with high precision with a simple structure.

An optical measuring apparatus according to claim 1 of the present invention includes: a light receiving element that detects light emitted from a light emitting element arranged adjacent to another light emitting element, wherein the light receiving element detects that the light is supplied to the light emitting element Light emitted by a light-emitting element without detecting the light Light emitted by a light-emitting element causes light emitted by the other light-emitting element and light reflected from the other light-emitting element among light emitted by the light-emitting element.

3‧‧‧Optical measuring device

101‧‧‧Lighting elements

101a‧‧‧Lighting surface

101b‧‧‧Generation Department

101c‧‧‧wavelength conversion unit

103‧‧‧Loading table

103a‧‧‧glass table

103b‧‧‧cutting piece

105‧‧‧Photodetector

105a‧‧‧Light-receiving components

105b‧‧‧ gap

108‧‧·score ball

108a‧‧‧ inner wall

108b‧‧‧take entrance

108c‧‧‧Export

109‧‧‧Probe

111‧‧‧Signal line

113‧‧‧Amplifier

117‧‧‧ fiber optic

117a‧‧‧Fiber head

117b‧‧‧Light transmission path

117c‧‧‧ entrance port

117d‧‧‧First path

117e‧‧‧second path

118‧‧‧Bundle fiber

118c‧‧‧ entrance port

119‧‧‧Bundle fiber

119c‧‧‧ entrance port

120‧‧‧Light Guide

121‧‧‧Spectroscope

121a‧‧‧Light-receiving components

122‧‧‧Light quantity regulator

125‧‧‧Electrical Characteristics Measurement Department

151‧‧‧Control Department

153‧‧‧HV unit

155‧‧‧ESD unit

157‧‧‧Switch unit

159‧‧‧ Positioning unit

163‧‧‧Output Department

201‧‧‧ aperture

201a‧‧‧ Opening

202‧‧‧ lens

203‧‧‧ lenticular lens array

203a‧‧‧ lenticular lens

204‧‧‧Microlens array

204a‧‧‧through hole

205‧‧‧ tube

205a‧‧‧ openings

206‧‧‧Shielding board

206a‧‧‧ Opening

207‧‧‧ reflector

A‧‧‧Distance from the center of the light-emitting element 101 to be measured to the outer edge

A‧‧‧ Distance from the center of the light-emitting element 101 to be measured to the outer edge of the generating portion 101b

B‧‧‧Distance between adjacent light-emitting elements 101

D‧‧‧ The distance from the center of the light-emitting element 101 to the outer edge of the range S ₀ when the range S _{0 is} projected onto the light-emitting element 101

L‧‧‧ Distance between the light-emitting element 101 and the optical fiber 117 to be measured

LCA‧‧‧Lighting Center Shaft

S10‧‧‧ steps

S20‧‧‧ steps

S30‧‧‧ steps

S40‧‧‧ steps

S50‧‧ steps

S60‧‧ steps

S70‧‧‧ steps

S80‧‧‧ steps

S ₀ ‧‧‧The range indicated by the numerical aperture NA

The range indicated by the numerical aperture of the S ₁ ‧‧‧ bundled fiber 118

The range indicated by the numerical aperture of the S ₂ ‧‧‧ bundled fiber 119

X‧‧‧ Distance from the center of the light-emitting element 101 to be measured to the outer edge of the light-emitting element 101 adjacent to the light-emitting element 101 to be measured

A‧‧‧Maximum angle of incidence of light obtained by total reflection in fiber 117

β‧‧‧An angle formed by the line connecting the periphery of the opening 205a and the entrance port 117c to the center axis of illumination LCA

Θ‧‧‧ When the Φ is fixed, it will be angled with the central axis of the illumination LCA

Φ‧‧‧ When the direction including the plane of the light-emitting surface 101a is taken as the reference axis (X-axis), and the angle from the X-axis on the plane is rotated counterclockwise

Only a few embodiments of the present invention will be described below with reference to the drawings.

Fig. 1 (a) to (c) show the measurement of the light emission state of the light-emitting element by an optical measuring device.

Fig. 2 is a view schematically showing the configuration of an optical measuring device.

Fig. 3A is an enlarged view of an optical fiber and a light-emitting element included in the optical measuring device.

Fig. 3B is a view showing the light-emitting element shown in Fig. 3A viewed from the direction of the central axis of the light emission.

Fig. 4 is a view for explaining an example 1 of an adjustment unit of the optical measuring device.

Fig. 5 is a view for explaining another example 2 of the adjustment unit of the optical measuring device.

Fig. 6 is a view for explaining measurement conditions when optical characteristics of a light-emitting element are measured by an optical measuring device.

Fig. 7A is a measurement result relating to the chromaticity of the light-emitting element shown in Fig. 6, showing the chromaticity coordinate x in the CIE-XYZ color system.

Fig. 7B is a measurement result relating to the chromaticity of the light-emitting element shown in Fig. 6, showing the chromaticity coordinate y in the CIE-XYZ color system.

Fig. 8 shows the measurement results relating to the amount of light of the light-emitting element shown in Fig. 6.

9A is a view for explaining an optical measuring apparatus for simultaneously measuring optical characteristics of a plurality of arranged light-emitting elements by a plurality of light-emitting elements.

Fig. 9B is a view showing the light-emitting element shown in Fig. 9A viewed from the direction of the central axis of the light emission.

Fig. 10A is a view for explaining a first modification of the optical measuring device.

Fig. 10B is a view showing the light-emitting element and the bundled optical fiber shown in Fig. 10A as seen from the direction of the central axis of the light emission.

Figure 10C is a view showing other cross-sectional shapes of the bundled optical fibers shown in Figures 10A and 10B. Figure.

Fig. 11 is a view for explaining a second modification of the optical measuring device.

Fig. 12A is a view for explaining a third modification of the optical measuring apparatus.

Fig. 12B is a view for explaining light refraction in the lens shown in Fig. 12A.

Fig. 13A is a view for explaining a fourth modification of the optical measuring apparatus.

Fig. 13B is a view showing the light-emitting element and the bundled optical fiber shown in Fig. 13A as seen from the direction of the central axis of the light emission.

Fig. 14A is a view for explaining a fifth modification of the optical measuring apparatus.

FIG. 14B is a view for explaining another example 1 in the fifth modification of the optical measuring apparatus.

Fig. 14C is a view for explaining another example 2 in the fifth modification of the optical measuring apparatus.

Fig. 15A is a view for explaining a sixth modification of the optical measuring apparatus.

Fig. 15B is a view showing the light receiving element of the photodetector shown in Fig. 15A viewed from the direction of the central axis of the light emission.

Fig. 16 is a view for explaining a modification 7 of the optical measuring apparatus.

Fig. 17 is a view for explaining a modification 8 of the optical measuring apparatus.

Fig. 18 is a view for explaining a modification 9 of the optical measuring apparatus.

19A is a view for explaining a modification 10 of the optical measuring device.

Fig. 19B is a view showing the shielding plate and the light-emitting element shown in Fig. 19A as seen from the direction of the central axis of the light emission.

FIG. 20 is a view for explaining another example of Modification 10 of the optical measuring apparatus.

FIG. 21 is a view for explaining a modification 11 of the optical measuring apparatus 3.

Fig. 22 is a flowchart for explaining processing performed when the control unit 151 shown in Fig. 21 performs optical characteristic measurement.

Fig. 23 is a view for explaining another example of the eleventh modification of the optical measuring apparatus.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. the following The embodiments described are only a few examples of the invention, and the invention is not limited by the contents thereof. In addition, all the structures and operations described in the respective embodiments are not essential structures or operations of the present invention. In addition, the same components are denoted by the same reference numerals, and the duplicated description is omitted.

<Lighting condition of light-emitting element>

The state of light emission of the light-emitting element 101 measured by the optical measuring device 3 will be described with reference to Fig. 1 .

Fig. 1 shows the measurement of the light-emitting state of the light-emitting element 101 by the optical measuring device 3.

The light-emitting element 101 includes at least an electrode and a light-emitting portion, which is an element that emits light of a specific wavelength range when power is supplied. The light emitting element 101 can be, for example, a light emitting diode.

As shown in FIG. 1(a), the light emitted from the light-emitting surface 101a of the light-emitting element 101 is radially formed.

The light emitting surface 101a is located on the surface of the light emitting element 101. The normal line of the light-emitting surface 101a of the light-emitting element 101 is referred to as an emission center axis LCA. In Fig. 1(a), the light-emitting surface 101a is a surface of the light-emitting element 101 on the positive side of the light-emitting central axis LCA.

When a direction on the plane including the light-emitting surface 101a is taken as the reference axis (x-axis), the angle rotated counterclockwise from the x-axis on the plane is defined as Φ. Further, when Φ is fixed, the angle with the center axis of illumination LCA is defined as θ.

When the light-emitting element 101 emits light, the intensity of light emitted from the light-emitting surface 101a differs depending on the angle θ or the like between the light-emitting central axis LCA.

The amount of light is such that the value of Φ is from 0° to 360°, and the value of θ is from 0° to 90°, and the light intensity is calculated for the back side of the light-emitting element 101, and two of them are calculated. The total value of the person.

By knowing the amount of light, it is possible to check whether or not the light-emitting element 101 is suitable for various modes of use.

The value of the light intensity emitted from the light-emitting element 101 differs depending on the different θ and Φ. for The light intensity is visually expressed and described using a graph as shown in Fig. 1(b).

In Fig. 1(b), the intersection of the x-axis and the y-axis is represented by θ = 0°. Each point on the circle represents the position of each Φ of θ = 90°.

Figure 1 (c) is a cross-sectional view of the Φ value at a fixed position.

Here, the light intensity is defined as the light distribution intensity E(θ) at the same distance from the light-emitting element 101 and at an angle θ with respect to the light-emitting central axis LCA. The light distribution intensity E(θ) corresponds to the light distribution intensity distribution of each θ as shown in the figure.

Further, once the light distribution intensity distribution is known, the amount of light of the light-emitting element 101 can be obtained in accordance with the next step.

That is, the light distribution intensity E(θ) is integrated by the circumference around the light emission center axis LCA (integrally from Φ=0° to 360°), and the circumferential light distribution intensity J(θ) is obtained. The circumferential light intensity J(θ) is J(θ)=E(θ). 2πr. Sin θ is expressed. By integrating θ=0° to θ° of the circumferential light distribution intensity J(θ), the amount of light K(θ) on the surface side of the light-emitting element 101 can be obtained.

Further, by multiplying K(θ) by the fixed coefficient κ, the amount of light on the back side of the light-emitting element 101 can be calculated.

Next, the amount of light K (θ) on the surface side is added to the amount of light K (θ) on the back side. κ, the amount of light of the light-emitting element 101 can be calculated.

In addition, it is understood that the light-emitting element 101 manufactured by the same process has a substantially constant difference between the amount of light on the surface side of the light-emitting element 101 and the amount of light on the back side. Therefore, as long as the amount of light of one light-emitting element 101 is actually measured and the coefficient κ is obtained, the other light-emitting elements 101 can also apply this value.

In the description of Fig. 1, it is assumed that the light-emitting element 101 can be regarded as one point, assuming that the measurement is made far enough from the light-emitting element 101. In general, the light-emitting element 101 is extremely small compared to the photodetector 105 (see FIG. 2), and thus such an assumption can be established. Unless otherwise stated in the description of FIG. 2 and subsequent steps, the same is true.

<Configuration of Optical Measuring Device>

The structure of the optical measuring device 3 will be described with reference to Fig. 2 .

FIG. 2 schematically shows the configuration of the optical measuring device 3.

The optical measuring device 3 is a device that measures the optical characteristics of light emitted from the light-emitting element 101. The optical characteristics measured by the optical measuring device 3 include at least the amount of light, the wavelength, and the chromaticity of the light emitted from the light-emitting element 101.

Further, the optical measuring device 3 can be applied to an inspection device used in an inspection step included in the process of the light-emitting element 101. The optical measuring device 3 can measure the electrical characteristics in addition to the optical characteristics of the light-emitting element 101.

The optical measuring apparatus 3 includes at least a mounting table 103, a probe 109, an optical fiber 117, a signal line 111, a photodetector 105, an amplifier 113, a spectroscope 121, an electrical characteristic measuring unit 125, a control unit 151, and an output unit 163.

The mounting table 103 is a measurement sample stage on which the light-emitting element 101 to be measured is placed.

The placing table 103 has a substantially uniform flat shape and is provided to be substantially horizontal.

The mounting table 103 and the light-emitting elements 101 mounted thereon are substantially parallel to each other.

The mounting table 103 has at least a glass table 103a and a dicing sheet 103b.

The glass table 103a uses a light-transmitting material such as sapphire or glass to form a substantially uniform flat plate shape.

The surface of the dicing sheet 103b has adhesiveness and is laminated on the glass table 103a. The light-emitting element 101 is placed on this dicing sheet 103b.

The mounting table 103 having the dicing sheet 103b can easily transfer the light-emitting element 101 to the mounting table 103 at the time of measurement, and suppress the displacement thereof.

Further, in the process of the light-emitting element 101, when a plurality of light-emitting elements 101 are arranged in advance on the dicing sheet 103b, the light-emitting element 101 and the dicing sheet 103b may be placed together on the glass table 103a.

The probe 109 supplies electric power to the light emitting element 101 to cause the light emitting element 101 to emit light. The probe 109 is substantially parallel to the light emitting surface 101a of the light emitting element 101 along the normal to the light emitting element 101. Radially extending in a right angle.

The probe 109 of FIG. 2, when measuring the optical characteristics of the light-emitting element 101, contacts the electrode of the light-emitting element 101 and applies a voltage thereto. Further, the probe 109 is connected to the electrical characteristic measuring unit 125, and the electrical characteristics of the light-emitting element 101 can be simultaneously measured. The probe 109 is disposed on the upper surface, the lower surface, or the upper and lower surfaces of the light-emitting element 101 in accordance with the electrode position of the light-emitting element 101.

When the probe 109 is brought into contact with the light-emitting element 101, the probe 109 can be moved while the mounting table 103 and the light-emitting element 101 are fixed. Conversely, the mounting table 103 and the light-emitting element 101 may be moved while the probe 109 is stationary.

The optical fiber 117 takes in light emitted from the light-emitting element 101 and conducts light to the photodetector 105 and the spectroscope 121. The optical fiber 117 takes in light using a predetermined numerical aperture.

The optical fiber 117 includes a fiber tip 117a, an optical transmission path 117b, and an entrance port 117c.

The optical fiber head 117a is a portion that takes in light.

The optical fiber head 117a is formed in a cylindrical shape. The tip end of the optical fiber head 117a is provided with an opening for allowing light to enter, that is, an entrance port 117c. The optical fiber head 117a is disposed such that the entrance port 117c faces the light emitting surface 101a of the light emitting element 101. The central axis of the entrance port 117c is substantially the same as the central axis of illumination LCA of the light-emitting element 101 to be measured. The central axis of the fiber tip 117a is substantially the same as the central axis of the entrance port 117c.

The entrance port 117c makes light incident in a range corresponding to the numerical aperture of the predetermined optical fiber 117.

The optical transmission path 117b is optically connected to the optical fiber head 117a at the end opposite to the distal end of the entrance port 117c, the photodetector 105, and the spectroscope 121.

The light transmission path 117b guides light incident from the entrance port 117c to the photodetector 105 and the beam splitter 121. The light transmission path 117b totally reflects the light incident from the entrance port 117c therein, and reduces the transmission loss as much as possible, and guides the light to the photodetector 105 and the spectroscope 121.

The photodetector 105 detects the light emitted from the light-emitting element 101 via the optical fiber 117 and the light-receiving element 105a, and measures the optical characteristics.

Among the optical characteristics measured by the photodetector 105, at least the amount of light emitted by the light-emitting element 101 is included.

When light is incident on the light receiving element 105a, charges corresponding to the incident light are generated by photoelectric conversion. The light receiving element 105a can be, for example, a photodiode or the like.

The photodetector 105 collects all the light intensities of the incident light incident on the light receiving element 105a, and obtains the amount of incident light. The photodetector 105 generates an electrical signal corresponding to the determined amount of light. The photodetector 105 outputs the generated electrical signal to the amplifier 113 via the signal line 111. This electrical signal corresponds to the amount of light information measured by the photodetector 105.

The amplifier 113 amplifies the electric signal output from the photodetector 105 and outputs it to the control unit 151.

The spectroscope 121 detects the light emitted from the light-emitting element 101 via the optical fiber 117 and the light-receiving element 121a, and measures the optical characteristics.

Among the optical characteristics measured by the spectroscope 121, at least the amount of light, the wavelength, and the chromaticity of the light emitted from the light-emitting element 101 are included.

When light is incident on the light receiving element 121a, electric charges corresponding to the incident light are generated by photoelectric conversion. The light receiving element 121a can be, for example, a CCD (Charge Coupled Device) or a photodiode array.

The spectroscope 121 wavelength-divides the incident light incident on the light-receiving element 121a, and obtains the light intensity of each wavelength after dispersion. The light intensity at each wavelength corresponds to the wavelength spectrum information of the incident light. The spectroscope 121 calculates the component ratios of the red (R), green (G), and blue (B) tristimulus values from the wavelength spectrum information, and obtains the chromaticity of the incident light. Further, the spectroscope 121 accumulates the light intensities of the respective wavelengths after dispersion, and obtains the amount of incident light. The beam splitter 121 can find other optical characteristics as needed.

The beam splitter 121 produces electrical signals corresponding to the various optical characteristics found. The spectroscope 121 outputs the generated electric signal to the control unit 151 via the signal line 111. The electrical signal is equivalent to the wavelength spectrum information, the chrominance information, and the light quantity information measured by the beam splitter 121. Wait.

The electrical characteristic measurement unit 125 includes at least a positioning unit 159, an HV unit 153, an ESD unit 155, and a switching unit 157.

The positioning unit 159 positions and fixes the probe 109. Specifically, in the form in which the placement table 103 moves, the positioning unit 159 has a function of holding the tip end position of the probe 109 at a fixed position. Conversely, in the form in which the probe 109 is moved, the positioning unit 159 has a predetermined position at which the tip end position of the probe 109 is moved to the mounting table 103 on which the light-emitting element 101 is placed, and thereafter held therein. The function of the location.

The HV unit 153 has a function of applying a rated voltage and detecting various electrical characteristics of the light-emitting element 101 of the rated voltage.

Normally, the light emitted from the light-emitting element 101 is measured by the photodetector 105 and the spectroscope 121 in a state where the voltage from the HV unit 153 is applied.

The various characteristic messages detected by the HV unit 153 are output to the control unit 151.

The ESD unit 155 is a unit that applies an instantaneous large voltage to the light-emitting element 101 to cause electrostatic discharge and checks whether it is subjected to electrostatic breakdown or the like.

The static electricity destruction information detected by the ESD unit 155 is output to the control unit 151.

The switching unit 157 performs switching of the HV unit 153 and the ESD unit 155.

The voltage applied to the light emitting element 101 by the probe 109 is changed by the switching unit 157. Then, by this change, the inspection items of the light-emitting element 101 can be changed to detect various characteristics at the rated voltage, respectively, or to detect whether they are damaged by static electricity.

The control unit 151 generally controls the operation of the optical measurement device 3.

The light amount information measured by the photodetector 105 is input to the control unit 151.

The wavelength spectrum information, the chromaticity information, and the light amount information measured by the spectroscope 121 are input to the control unit 151. The various electrical characteristic information output by the HV unit 153 is input to the control unit 151. The electrostatic breakdown information detected by the ESD unit 155 is also input to the control unit 151.

The control unit 151 classifies and analyzes various characteristics of the light-emitting element 101 by these inputs. After analyzing various characteristics, the control unit 151 outputs the analysis result by the output unit 163 for information such as video output. Further, based on the analysis result, the control unit 151 controls each component of the optical measurement device 3 as needed.

<Configuration of Light-emitting Element>

The structure of the light-emitting element 101 of the present embodiment will be described with reference to FIGS. 3A and 3B.

3A is an enlarged view of the optical fiber 117 and the light-emitting element 101 included in the optical measuring device 3. Fig. 3B is a view showing the light-emitting element 101 shown in Fig. 3A viewed from the direction of the light-emitting central axis LCA.

As described above, the light-emitting element 101 is an element that can emit light of a specific wavelength range when power is supplied. Light of a particular wavelength range exhibits a particular color.

The light-emitting element 101 of the present embodiment generates light of a specific color, and converts the generated light into a light of another color, and then emits it to the outside. That is, the light-emitting element 101 of the present embodiment emits light of a different color from the light generated therefrom. The light-emitting element 101 can be, for example, a pseudo-white light-emitting diode that covers a yellow phosphor on a blue light-emitting diode.

The light-emitting element 101 of the present embodiment includes at least a generating unit 101b and a wavelength converting unit 101c.

When power is supplied to the generating portion 101b, light of a specific wavelength range is generated. The generating unit 101b emits the generated light.

The generating portion 101b may be a member that utilizes an electroluminescence phenomenon. The generating portion 101b can be, for example, a light emitting diode. The generating portion 101b may be, for example, a blue light emitting diode.

The wavelength conversion unit 101c converts the wavelength of the incident light. The wavelength conversion unit 101c emits light that has undergone wavelength conversion.

The wavelength converting portion 101c may be a member that utilizes a photoluminescence phenomenon. The wavelength conversion unit 101c can be, for example, a phosphor. The wavelength converting portion 101c can be, for example, a yellow phosphor.

The wavelength conversion unit 101c is provided to cover the surface of the generation unit 101b. At this time, the light emitted from the generating unit 101b is incident on the wavelength conversion unit 101c. The wavelength conversion unit 101c performs wavelength conversion on the incident light and emits it to the outside. The light emitted from the wavelength conversion unit 101c to the outside is different from the color of the light emitted from the generating unit 101b.

When the generating unit 101b is a blue light emitting diode and the wavelength converting unit 101c is a yellow phosphor, the blue light emitted from the generating unit 101b is incident on the wavelength converting unit 101c. The wavelength conversion unit 101c absorbs a part of the incident blue light to be in an excited state, and emits yellow light when it is transferred to the ground state. Next, the wavelength conversion unit 101c emits white light in which the yellow light and the unabsorbed blue light are mixed to the outside. That is, the light emitted from the light-emitting element 101 is the light emitted from the wavelength conversion portion 101c.

<Arrangement pattern of light-emitting elements in the inspection step>

In the inspection step which is one of the processes of the light-emitting element 101, as shown in FIGS. 3A and 3B, the light-emitting elements 101 are arranged in a lattice pattern of a plurality of arrays. The light-emitting element 101 is fabricated by cutting a semiconductor wafer attached to a dicing sheet into a plurality of wafers. The light-emitting element 101 after the dicing is in a state in which a plurality of dicing sheets are arranged in a lattice shape.

The optical measuring device 3 measures the optical characteristics and electrical characteristics of the light-emitting elements 101 in a plurality of arranged states, and checks whether or not they have desired performance. At the time of inspection, the light-emitting elements 101 are transferred in a state in which a plurality of light-emitting elements 101 are arranged on the mounting table 103 of the optical measuring device 3. The optical measuring device 3 sequentially supplies electric power to each of the plurality of light-emitting elements 101 in an array state, and measures optical characteristics and electrical characteristics. When the light-emitting element 101 to be measured is supplied with electric power, most of the light emitted from the light-emitting element 101 is incident on the optical fiber 117. On the other hand, a part of the light emitted from the light-emitting element 101 to be measured is incident on the light-emitting element 101 other than the measurement target.

As described above, the light incident on a part of the light-emitting element 101 other than the measurement target is absorbed by the wavelength conversion unit 101c of the light-emitting element 101 other than the measurement target, and the light-emitting element 101 other than the measurement target is caused to emit light. In addition, a light-emitting element that is incident on the outside of the measurement target A part of the light of 101 is reflected by the light-emitting element 101 other than the measurement target, and is emitted from the light-emitting element 101 other than the measurement target. The light emitted from the light-emitting element 101 other than the measurement target and the light reflected by the light-emitting element 101 other than the measurement target are "the light-emitting element 101 other than the measurement target caused by the light emission of the light-emitting element 101 to be measured. The light that is emitted."

The "light emitted from the light-emitting element 101 other than the measurement target due to the light emission of the light-emitting element 101 to be measured" is light that is not expected by the measurer. Therefore, in the present embodiment, the "light emitted from the light-emitting element 101 other than the measurement target due to the light emission of the light-emitting element 101 to be measured" is also referred to as "the light emitted from the light-emitting element 101 other than the measurement target". Unexpected light."

In other words, in the present embodiment, the light emitted from the light-emitting element 101 other than the measurement target caused by the incidence of the light emitted from the light-emitting element 101 to be measured, and the light emitted from the light-emitting element 101 as the measurement target The light reflected by the light-emitting element 101 other than the measurement target is referred to as "unexpected light emitted from the light-emitting element 101 other than the measurement target".

The "unintended light emitted from the light-emitting element 101 other than the measurement target" is also incident on the optical fiber 117 disposed to face the light-emitting element 101 to be measured. When the "unintended light emitted from the light-emitting element 101 other than the measurement target" is incident on the optical fiber 117, the optical characteristics of the light-emitting element 101 to be measured cannot be accurately measured.

In particular, when the light-emitting element 101 is a pseudo-white light-emitting diode, it is more difficult to measure its chromaticity with higher precision. In other words, the white light emitted from the light-emitting element 101 to be measured is incident on the wavelength conversion unit 101c which is a yellow phosphor of the light-emitting element 101 other than the measurement target. As a result, the light-emitting element 101 other than the measurement target emits yellow light. On the other hand, the yellow light is incident on the optical fiber 117 arranged to measure the chromaticity of the light-emitting element 101 to be measured.

The yellow light emitted from the light-emitting element 101 other than the measurement object is incident on the optical fiber once incident 117, the yellow light is guided to the photodetector 105 and the spectroscope 121, and detected by the light receiving element 105a and the light receiving element 121a. Eventually, the ratio of the yellow component in the measurement result of the chromaticity of the light-emitting element 101 to be measured is increased. On the other hand, the increase in the ratio of the yellow component means that the chromaticity of the light-emitting element 101 to be measured cannot be measured with high precision.

Therefore, it is necessary to accurately measure the optical characteristics of the light-emitting element 101 to be measured in the plurality of arranged light-emitting elements 101.

<Light detection range in optical measuring device>

The optical measurement device 3 of the present embodiment is configured to detect light emitted from the light-emitting element 101 to be measured among the plurality of light-emitting elements 101 arranged in a plurality of rows, and does not detect the non-emission of the light-emitting element 101 other than the measurement target. The construction of the expected light.

In FIGS. 3A and 3B, the light-emitting element 101 disposed at the center is used as a measurement target. The light-emitting element 101 disposed around the light-emitting element 101 is a light-emitting element 101 other than the measurement target.

When the optical characteristics of the light-emitting element 101 to be measured are measured, the optical measuring device 3 faces the light-emitting element 101 of the optical fiber 117 with respect to the light-emitting element 101 to be measured. Preferably, the optical measuring device 3 makes the central axis of the light-emitting central axis LCA and the entrance opening 117c of the light-emitting element 101 to be measured substantially the same, and opposes the two.

Here, as shown in FIG. 3A, the distance between the light-emitting element 101 to be measured and the optical fiber 117 is defined as L. The distance from the center to the outer edge of the light-emitting element 101 to be measured is defined as A. The distance between adjacent light-emitting elements 101 is defined as B. The distance from the center of the light-emitting element 101 to be measured to the outer edge of the light-emitting element 101 adjacent to the light-emitting element 101 to be measured is defined as X.

Further, the maximum value of the incident angle of the light obtained by total reflection in the optical fiber 117 is defined as α. The medium between the optical fiber 117 and the light-emitting element 101 is defined as air, and its refractive index = 1 is defined. The numerical aperture of the optical fiber 117 is defined as NA, and the range indicated by the numerical aperture NA is defined as S ₀ . The distance from the center of the light-emitting element 101 to the outer edge of the range S ₀ when the range S _{0 is} projected onto the light-emitting element 101 is defined as D.

At this time, the numerical aperture NA is NA = sinα. The distance X is X=A+B. The distance D is D = Ltan α.

When the light-emitting element 101 is present in the range S ₀ indicated by the numerical aperture NA, the light emitted from the light-emitting element 101 is totally reflected in the optical fiber 117, and is guided to the photodetector 105 and the spectroscope 121. On the other hand, if the light-emitting element 101 does not exist in the range S ₀ , the light emitted from the light-emitting element 101 cannot be guided to the photodetector 105 and the spectroscope 121.

Therefore, the range S ₀ indicated by the numerical aperture NA corresponds to a range in which light can be detected by the light receiving element 105a included in the photodetector 105 and the light receiving element 121a included in the spectroscope 121.

In the present embodiment, the range in which the light is detected by the light receiving element 105a and the light receiving element 121a may be referred to as a "detection range".

Further, the detection ranges of the light receiving element 105a and the light receiving element 121a correspond to the range of light in which the optical measuring device 3 can measure optical characteristics.

The optical measuring device 3 adjusts the detection range of the light receiving element 105a and the light receiving element 121a so as not to detect the unintended light emitted from the light emitting element 101 other than the measurement target while detecting the light emitted from the light emitting element 101 to be measured. .

The detection range of the light receiving element 105a and the light receiving element 121a can be adjusted, for example, by adjusting the distance L between the light emitting element 101 and the optical fiber 117 to be measured.

In order to detect the light emitted from the light-emitting element 101 to be measured, the optical measuring device 3 does not detect the unexpected light emitted from the light-emitting element 101 other than the measurement target, and adjusts the distance L as follows. In other words, the optical measuring device 3 adjusts the distance L so that the light-emitting element 101 to be measured is located in the range S ₀ and the light-emitting element 101 other than the measurement target is not located in the range S ₀ .

As long as the distance D is equal to or greater than the distance A, the condition that the light-emitting element 101 to be measured is within the range S ₀ is satisfied. The distance L when the distance D is a distance D is L ≧ A / tan α. In order to position the light-emitting element 101 to be measured within the range S ₀ , the optical measuring device 3 may adjust the distance L so as to satisfy the relationship of L ≧ A / tan α. When the relationship is satisfied, the light emitted from the light-emitting element 101 to be measured is guided to the light-receiving element 105a and the light-receiving element 121a and detected.

On the other hand, as long as the distance D is equal to or less than the distance X, the condition that the light-emitting element 101 other than the measurement target is not located in the range S ₀ is satisfied. The distance L when the distance D is distance X is L≦X/tanα. In order to prevent the light-emitting element 101 other than the measurement target from being located within the range S ₀ , the optical measuring device 3 may adjust the distance L so as to satisfy the relationship of L ≦ X / tan α. As long as the relationship is satisfied, the unintended light emitted from the light-emitting element 101 other than the measurement target is not guided to the light-receiving element 105a and the light-receiving element 121a and is not detected.

In other words, the optical measuring device 3 adjusts the distance L so as to satisfy the relationship of the following equation so that the light-emitting element 101 to be measured is located in the range S ₀ and the light-emitting element 101 other than the measurement target is not located in the range S ₀ .

A/tanα≦L≦X/tanα

In the state where the plurality of light-emitting elements 101 are arranged, the optical measuring device 3 does not detect the unexpected light emitted from the light-emitting element 101 other than the measurement target, and only detects the light-emitting element as the measurement target. The light emitted by 101.

In addition, measurement of the optical characteristics, even if the light-emitting element may be measured as the generating unit 101b and 101c of the wavelength conversion portion 101 is not located within the entire range S _0, can be sufficiently ensure the measurement accuracy thereof.

For example, the light-emitting element may be measured as long as the generating unit 101b 101 can be positioned to ensure that measurement accuracy is in the range of S _0. In this case, the distance from the center of the light-emitting element 101 to be measured to the outer edge of the generating portion 101b is defined as a (<A), and the optical measuring device 3 adjusts the distance L to satisfy the relationship of the following formula.

a/tanα≦L≦X/tanα

In either case, the optical measuring device 3 only needs to adjust the distance L to at least satisfy the relationship of L ≦ X / tan α.

<Adjustment section of optical measuring device>

The adjustment unit provided in the optical measurement device 3 will be described with reference to FIGS. 4 and 5 .

FIG. 4 is a view for explaining an example 1 of the adjustment unit of the optical measurement device 3. FIG. 5 is a view for explaining another example 2 of the adjustment unit of the optical measuring apparatus 3.

The adjustment unit is a mechanism for adjusting the detection range of the range of light detected by the light receiving element 105a and the light receiving element 121a.

As described above, the detection ranges of the light receiving element 105a and the light receiving element 121a are adjusted by adjusting the distance L between the light emitting element 101 and the optical fiber 117 to be measured.

The optical measuring device 3 includes an adjustment mechanism such as a distance L as an adjustment unit for adjusting the detection ranges of the light receiving element 105a and the light receiving element 121a.

The adjustment mechanism of the distance L can be constituted by, for example, an actuator (not shown) mounted on the optical fiber 117. As shown in FIG. 4, the adjustment mechanism of the distance L causes the optical fiber 117 to move along the central axis of illumination LCA. Therefore, even if the optical fiber 117 is moved by the adjustment mechanism of the distance L, the incident port 117c of the optical fiber 117, the light-emitting element 101, and the mounting table 103 can be placed in an arrangement relationship substantially parallel to each other.

Once the optical fiber 117 is moved by the adjustment mechanism, the entrance port 117c of the optical fiber 117 approaches or moves away from the light-emitting element 101, thereby changing the distance L. Thereby, the light incident on the optical fiber 117 is restricted, and the detection ranges of the light receiving element 105a and the light receiving element 121a are adjusted.

Further, the adjustment mechanism of the distance L may move the mounting table 103 on which the light-emitting element 101 is placed without moving the optical fiber 117, and may move both the mounting table 103 and the optical fiber 117.

Further, the detection range of the light receiving element 105a and the light receiving element 121a can be adjusted by adjusting the distance L between the light emitting element 101 and the optical fiber 117 which are measurement targets.

The optical measuring device 3 can block the light incident on the optical fiber 117 by blocking a part of the light emitted from the light-emitting element 101 to be measured, and adjust the detection range of the light-receiving element 105a and the light-receiving element 121a.

As shown in FIG. 5, the optical measurement device 3 may include, for example, a diaphragm 201 as an adjustment unit for adjusting the detection ranges of the light receiving element 105a and the light receiving element 121a.

The aperture 201 is disposed between the light-emitting element 101 to be measured and the optical fiber 117. The aperture 201 is formed in a substantially disk shape with the central axis of illumination LCA as a central axis. The aperture 201 has an opening portion 201a at the center which can be changed in size.

In the optical measuring apparatus 3 of Fig. 5, the position of the optical fiber 117 is fixed at a position where the light-emitting element 101 other than the measurement target is not included in the range S ₀ . That is, the position of the optical fiber 117 is fixed at a position where the distance L is adjusted to L = X / tan α. Further, the aperture 201 is designed such that the range S ₀ of the optical fiber 117 fixed at this position falls within the opening 201a.

When the size of the opening 201a of the aperture 201 is changed, the blocking range of the light emitted by the light-emitting element 101 to be measured can be changed. Thereby, the light incident on the optical fiber 117 is restricted, and the detection ranges of the light receiving element 105a and the light receiving element 121a are adjusted.

<Measurement result>

The measurement results of the optical characteristics of the light-emitting element 101 measured by the optical measuring device 3 will be described with reference to Figs. 6 to 8 .

First, the measurement conditions will be described using FIG.

FIG. 6 is a view for explaining measurement conditions when the optical characteristics of the light-emitting element 101 are measured by the optical measuring device 3.

In FIG. 6, the light-emitting element 101 as a measurement target is shown in black, and the light-emitting element 101 other than the measurement target is shown in white.

The measurement conditions when the optical characteristics of the light-emitting element 101 are measured by the optical measuring device 3 are defined as measurement conditions 1 to 4. The arrangement patterns of the light-emitting elements 101 in the measurement conditions 1 to 4 are different.

The common conditions of the measurement conditions 1 to 4 are as follows.

The light-emitting elements 101 to be measured and the light-emitting elements 101 other than the measurement target in the measurement conditions 1 to 4 are the same light-emitting elements 101 including the generation unit 101b and the wavelength conversion unit 101c. The light-emitting element 101 is defined as a pseudo-white light-emitting diode in which the generating portion 101b is a blue light-emitting diode and the wavelength converting portion 101c is a yellow phosphor. Further, the light-emitting element 101 is formed into a square shape having a side length of 1 mm.

The distance between adjacent light-emitting elements 101 in the measurement conditions 1 to 4 was 0.3 mm.

In each of the measurement conditions 1 to 4, one light-emitting element 101 is used as a measurement target, and electric power is supplied to emit light, and the chromaticity and the amount of light are measured.

In the measurement conditions 1 to 4, the measurement was performed using the optical measurement device 3 of the present embodiment and a conventional measurement device. In the adjustment portion of the optical measurement device 3 of the present embodiment, the adjustment portion of the example 2 shown in Fig. 5 is used.

The other conditions in the measurement conditions 1 to 4 are also the same.

The conditions for the measurement conditions 1 to 4 are as follows.

One light-emitting element 101 was used under the measurement condition 1. The arrangement pattern of the measurement condition 1 is a configuration in which only one single-piece state of the light-emitting element 101 to be measured is placed. The total length of the arrangement of the light-emitting elements 101 is 1 mm.

Five light-emitting elements 101 were used under the measurement condition 2. The arrangement pattern of the measurement condition 2 is a configuration in which the light-emitting element 101 to be measured is placed at the center, and four adjacent light-emitting elements 101 other than the measurement target are disposed around the light-emitting element 101. The total length of the arrangement of the light-emitting elements 101 is 3.6 mm.

Nine light-emitting elements 101 were used under the measurement condition 3. The arrangement pattern of the measurement condition 3 is a configuration in which the light-emitting element 101 to be measured is placed at the center, and the light-emitting elements 101 other than the eight adjacent measurement targets are disposed around the light-emitting element 101. The total length of the arrangement of the light-emitting elements 101 is 3.6 mm.

25 light-emitting elements 101 were used under the measurement condition 4. The arrangement pattern of the measurement condition 4 is The light-emitting element 101 to be measured is placed at the center, and the shape of the light-emitting elements 101 other than the 24 adjacent measurement targets is disposed around the light-emitting element 101. The total length of the arrangement of the light-emitting elements 101 is 6.2 mm.

Next, the measurement results of the chromaticity correlation will be described using FIG. 7A and FIG. 7B.

Fig. 7A is a measurement result relating to the chromaticity of the light-emitting element 101 shown in Fig. 6, showing the chromaticity coordinate x in the CIE-XYZ color system. Fig. 7B is a measurement result relating to the chromaticity of the light-emitting element 101 shown in Fig. 6, showing the chromaticity coordinates y in the CIE-XYZ color system.

As described above, the white light emitted by the light-emitting element 101 to be measured is incident on the wavelength conversion unit 101c of the light-emitting element 101 other than the measurement target, and the wavelength conversion unit 101c of the light-emitting element 101 other than the measurement target emits yellow. Light.

As shown in FIG. 7A and FIG. 7B, when the chromaticity is measured using a conventional measuring device, the measurement result of the measurement condition 1 and the measurement results of the measurement conditions 2 to 4 are greatly different.

Under the measurement condition 1, the arrangement pattern of the light-emitting elements 101 is in a single-chip state. The measurement result of the measurement condition 1 is an ideal result that is not affected by the unintended light emitted from the light-emitting element 101 other than the measurement target.

In the measurement conditions 2 to 4, the arrangement pattern of the plurality of light-emitting elements 101 other than the measurement target adjacent to the light-emitting element 101 to be measured is disposed. The reason why the measurement conditions 2 to 4 differ greatly from the measurement result of the measurement condition 1 is that it is affected by unintended light emitted from the light-emitting element 101 other than the measurement target. For example, the reason is that the yellow light emitted from the wavelength conversion portion 101c of the light-emitting element 101 other than the measurement target is incident on the optical fiber 117, is detected by the light-receiving element 121a, and the chromaticity is measured by the spectroscope 121.

In other words, in the chromaticity measurement of the plurality of arranged light-emitting elements 101, the measurement result of the conventional measuring device is affected by unintended light emitted from the light-emitting element 101 other than the measurement target, and the measurement accuracy is lowered.

Further, as shown in FIG. 7A and FIG. 7B, with the order of measurement condition 1, measurement condition 2, measurement condition 3, and measurement condition 4, the chromaticity coordinate value increases, and the chromaticity coordinate close to yellow is obtained. (x≒0.4, y≒0.5).

The reason for this is that the larger the number of light-emitting elements 101 other than the measurement target, the more the yellow light emitted by the light-emitting element 101 other than the measurement target increases, and the ratio of the yellow light component detected by the light-receiving element 121a. increase.

In other words, when the chromaticity of the plurality of light-emitting elements 101 is measured, the number of light-emitting elements 101 other than the measurement target is larger, and the measurement result of the conventional measurement device is more likely to be affected by the measurement target. The influence of unintended light emitted by the light-emitting element 101. Therefore, the larger the number of the light-emitting elements 101 other than the measurement target, the more easily the measurement accuracy of the measurement result of the conventional measurement device is lowered.

On the other hand, as shown in FIG. 7A and FIG. 7B, when the chromaticity is measured using the optical measuring device 3 of the present embodiment, the measurement results under the measurement conditions 1 to 4 are substantially the same.

This is because the optical measuring device 3 of the present embodiment includes the above-described adjustment unit, so that unintended light emitted from the light-emitting element 101 other than the measurement target can be prevented from entering the optical fiber 117 or being received by the light-receiving element 121a. detected.

In the chromaticity measurement of the light-emitting elements 101 of the plurality of arrays, the measurement result of the optical measurement device 3 of the present embodiment is not affected by the unintended light emitted from the light-emitting element 101 other than the measurement target, and The same high measurement accuracy as the measurement result in the single piece state was obtained.

Next, the measurement result of the light amount correlation will be described using FIG.

Fig. 8 shows the measurement results relating to the amount of light of the light-emitting element 101 shown in Fig. 6.

As shown in FIG. 8, when the amount of light is measured using a conventional measuring device, the measurement result of the measurement condition 1 and the measurement results of the measurement conditions 2 to 4 are greatly different. Further, with the order of measurement conditions 1, measurement conditions 2, measurement conditions 3, and measurement conditions 4, the amount of light increases.

The reason for this is that the larger the number of light-emitting elements 101 other than the measurement target, the more the yellow light emitted by the light-emitting element 101 other than the measurement target increases, and the light-receiving element 105a is more easily detected and measured by the photodetector 105. The amount of light will also increase.

In the measurement of the light amount of the plurality of light-emitting elements 101, the number of light-emitting elements 101 other than the measurement target is larger, and the measurement result of the conventional measurement device is more likely to be emitted outside the measurement target. The effect of unintended light emitted by element 101. Therefore, the larger the number of the light-emitting elements 101 other than the measurement target, the more easily the measurement accuracy of the measurement result of the conventional measurement device is lowered.

On the other hand, as shown in FIG. 8, when the amount of light is measured by the optical measuring device 3 of the present embodiment, the measurement results under the measurement conditions 1 to 4 are substantially the same.

This is because the optical measuring device 3 of the present embodiment includes the above-described adjustment unit, so that unexpected light emitted from the light-emitting element 101 other than the measurement target can be prevented from entering the optical fiber 117 or being received by the light-receiving element 105a. detected.

In the measurement of the light amount of the plurality of light-emitting elements 101, the measurement result of the optical measuring device 3 of the present embodiment is not affected by the unintended light emitted from the light-emitting element 101 other than the measurement target, and can be obtained. The same high measurement accuracy as the measurement result in the single piece state.

In this way, regardless of the arrangement pattern of the light-emitting elements 101, the optical measuring apparatus 3 of the present embodiment can measure the optical characteristics of the light-emitting element 101 with the same high measurement accuracy as the measurement in the single-chip state.

In the measurement results shown in FIG. 7A to FIG. 8 , in the state in which the plurality of light-emitting elements 101 are arranged, the light-emitting element 101 to be measured is one light-emitting element 101 . In other words, the optical measuring device 3 supplies electric power to one of the light-emitting elements 101 as a measurement target, and emits light to measure the optical characteristics.

However, the optical measuring device 3 may simultaneously measure the plurality of light-emitting elements 101 in a state in which the plurality of light-emitting elements 101 are arranged. In other words, the optical measuring device 3 may supply a plurality of light-emitting elements 101 as measurement targets, supply electric power to emit light, and measure optical characteristics.

9A is a view for explaining the simultaneous measurement of a plurality of arrangements of light rays by a plurality of light-emitting elements 101 A diagram of the optical measuring device 3 of the optical characteristics of the element 101. Fig. 9B is a view showing the light-emitting element 101 shown in Fig. 9A viewed from the direction of the light-emitting central axis LCA.

In the optical measurement device 3 that simultaneously measures the plurality of light-emitting elements 101 as measurement targets, a plurality of probes 109 and a plurality of optical fibers 117 are provided in advance. Further, in the optical measuring device 3, a photodetector 105, an amplifier 113, a spectroscope 121, an electrical property measuring unit 125, and a control unit 151 capable of simultaneously measuring a plurality of light-emitting elements 101 are designed in advance.

Further, the optical measuring device 3 is provided with a plurality of optical fibers 117 opposed to the plurality of light-emitting elements 101 to be measured. Further, the probes 109 in the optical measuring device 3 are respectively in contact with the electrodes of the plurality of light-emitting elements 101 to be measured. The optical measuring device 3 simultaneously supplies electric power to a plurality of light-emitting elements 101 to be measured to emit light, and simultaneously measures the optical characteristics of the light-emitting elements 101.

However, the optical measuring device 3 determines the distance between the light-emitting elements 101 to be measured, so that the light emitted from the light-emitting elements 101 of the other measurement target does not enter the optical fiber 117 disposed opposite to one of the light-emitting elements 101 to be measured. .

For example, as shown in FIG. 9A and FIG. 9B, each of the light-emitting elements 101 is formed in a square shape having an angle of 1 mm, and when the adjacent light-emitting elements 101 are arranged at intervals of 0.3 mm, the light-emitting elements 101 to be measured are mutually connected. The interval is set to 6.2 mm. The interval of 6.2 mm corresponds to the interval in which there are four light-emitting elements 101 to be measured. The size of this interval is such that the unexpected light emitted from the light-emitting element 101 other than the measurement target is not incident on the optical fiber 117. At the same time, the size of the interval is such that the light emitted from the light-emitting element 101 to be measured is not incident on the other light-emitting element 101 to be measured.

The optical measuring device 3 can simultaneously measure the plurality of light-emitting elements 101 separated by the interval, and can obtain the same measurement accuracy as when the plurality of light-emitting elements 101 are sequentially measured one by one.

<Modification of Optical Measuring Device>

A modification of the optical measuring device 3 will be described with reference to Figs. 10A to 23 .

In the configuration of the optical measuring device 3 shown in FIGS. 10A to 23, the same as FIG. 2 to FIG. Description of the same configuration of the optical measuring device 3 shown in FIG.

Modification 1 of the optical measuring device 3 will be described with reference to Figs. 10A to 10C.

FIG. 10A is a view for explaining a first modification of the optical measuring device 3. Fig. 10B is a view showing the light-emitting element 101 and the bundled optical fiber 118 shown in Fig. 10A as seen from the direction of the light-emitting central axis LCA. Fig. 10C is a view for explaining another cross-sectional shape of the bundled optical fiber 118 shown in Figs. 10A and 10B.

The optical measuring device 3 of the first modification includes a bundled optical fiber 118.

The bundled optical fiber 118 is composed of a bundle of a plurality of optical fibers 117.

The entrance port 118c of the bundled optical fiber 118 is disposed to face the light-emitting surface 101a of the light-emitting element 101 to be measured. The optical fiber 117 on the central axis of the bundled optical fiber 118 has substantially the same central axis as the light-emitting central axis LCA of the light-emitting element 101 to be measured.

Although not shown, the plurality of optical fibers 117 constituting the bundled optical fiber 118 are connected to the photodetector 105 and the spectroscope 121, respectively.

As shown in FIG. 10A and FIG. 10B, the cross-section of the bundled optical fiber 118 perpendicular to the central axis of the light emission LCA can be larger than the light-emitting surface 101a of the light-emitting element 101 to be measured. However, as shown in FIG. 10A and FIG. 10B, the size of the cross section is such that it does not cover the light-emitting element 101 adjacent to the light-emitting element 101 to be measured.

Further, the shape of the cross section of the bundled optical fiber 118 perpendicular to the central axis of illumination LCA may be a rectangle as shown in FIG. 10B or a circular shape as shown in FIG. 10C.

Modification Example 1 of the optical measuring device 3 is fixed to the bundle of fiber 118 so that the numerical aperture of the optical fiber bundle 118 is shown within the range S does not include the light emitting element ₁ than the position of the measurement object 101.

The range S ₁ indicated by the numerical aperture of the bundled fiber 118 is larger than the range S ₀ indicated by the numerical aperture NA of one of the fibers 117 included in the bundled fiber 118.

Therefore, the position of the bundled optical fiber 118 can be closer to the position of the light-emitting element 101 to be measured than the position of the optical fiber 117 when one optical fiber 117 is used. So, measure Unexpected light emitted from the light-emitting element 101 other than the fixed object is hard to be incident on the bundled optical fiber 118. As a result, the optical measuring device 3 of the first modification does not detect the unintended light emitted from the light-emitting element 101 other than the measurement target, and the light-emitting element 101 can be detected by the light-receiving element 105a and the light-receiving element 121a. The light emitted.

3 range of the device S ₁ of S ₀ greater than the range of a modification of the optical measurement, therefore, the object of the light emitting element 101 is emitted from the optical fiber bundle is incident to the measurement as 118, more than one optical fiber 117 during use. Therefore, in the optical measuring device 3 of the first modification, the light receiving element 105a and the light receiving element 121a can detect more light, and the amount of light can be measured with higher precision. It is also easy to perform alignment work of the bundled optical fiber 118 or the like.

Further, in the optical measuring device 3 of the first modification, the photodetector 105 and the spectroscope 121 are connected to the plurality of optical fibers 117 constituting the bundled optical fiber 118, and therefore, the light-emitting surface 101a of the light-emitting element 101 to be measured can be measured. Light intensity distribution and chromaticity distribution, etc.

Further, the optical measuring device 3 of Modification 1 can change the number of the plurality of optical fibers 117 constituting the bundled optical fiber 118. Once the number of fibers 117 constituting the bundled fiber 118 is changed, the range S ₁ indicated by the numerical aperture of the bundled fiber 118 also changes. Thereby, the optical measuring device 3 of the first modification can restrict the light incident on the bundled optical fiber 118 and adjust the detection range of the light receiving element 105a and the light receiving element 121a.

The adjustment unit included in the optical measuring device 3 of the first modification is configured such that the number of the plurality of optical fibers 117 constituting the bundled optical fiber 118 is changed.

Alternatively, the optical measuring device 3 according to the first modification may include a switch that switches the respective connections between the plurality of optical fibers 117 constituting the bundled optical fiber 118 and the light receiving element 105a and the light receiving element 121a to be effective or ineffective. Further, the optical measuring device 3 of the first modification may change the range S ₁ indicated by the numerical aperture of the bundled optical fiber 118 by controlling the switch. Thereby, the optical measuring apparatus 3 of the modification 1 can adjust the detection range of the light receiving element 105a and the light receiving element 121a.

The mode in which the plurality of optical fibers 117 constituting the bundled optical fiber 118 are connected to the light-receiving element 105a and the light-receiving element 121a is also configured to be tuned by the optical measuring device 3 of the first modification. Department.

Furthermore, the optical measuring apparatus 3 of the first modification may include the adjustment mechanism described with reference to FIG. 4 and the aperture 201 described with reference to FIG. 5. Further, the adjustment mechanism and the diaphragm 201 may constitute an adjustment unit included in the optical measurement device 3 of the first modification.

The other structure of the optical measuring device 3 of the first modification is the same as that of the optical measuring device 3 shown in FIGS. 2 to 9B.

Modification 2 of the optical measuring device 3 will be described with reference to Fig. 11 .

FIG. 11 is a view for explaining a second modification of the optical measuring device 3.

The optical measuring device 3 of the second modification has a larger structure of the integrating sphere 108 than the optical measuring device 3 of the first modification.

The integrating sphere 108 is formed in a hollow slightly spherical shape.

The integrating sphere 108 has an inner wall 108a, an intake port 108b, and a take-out port 108c.

The inner wall 108a forms an inner space of the integrating sphere 108. The inner wall 108a is made of a material having high reflectance and good diffusibility.

An inlet 108b and a outlet 108c are provided in the inner wall 108a.

The inlet 108b is an opening for taking in light emitted from the light-emitting element 101 to be measured.

The central axis of the opening of the inlet 108b of Fig. 11 is substantially the same as the central axis of the light emission LCA of the light-emitting element 101 to be measured. However, since the bundled optical fiber 118 can be bent, the central axis of the opening of the inlet 108b can be made different from the central axis of illumination LCA of the light-emitting element 101 to be measured.

The intake port 108b of FIG. 11 is formed in the same opening shape as the outer peripheral shape of the bundled optical fiber 118. A bundled optical fiber 118 is mounted on the intake port 108b.

Further, the outer peripheral shape of the bundled optical fiber 118 in the vicinity of the entrance port 118c may be different from the outer peripheral shape in the vicinity of the intake port 108b. For example, the outer peripheral shape of the bundled optical fiber 118 in the vicinity of its entrance opening 118c may have a rectangular shape, and it is taken The outer peripheral shape near the inlet 108b may have a circular shape.

The inlet 108b of FIG. 11 directs light guided by the bundled fiber 118 to the interior of the integrating sphere 108. The light guided from the intake port 108b to the inside of the integrating sphere 108 is repeatedly reflected on the inner wall 108a, and reaches the take-out port 108c.

The take-out port 108c is an opening for taking out the light reflected from the inner wall 108a to the outside of the integrating sphere 108.

The take-out port 108c is provided at a position different from the take-in port 108b of the inner wall 108a.

An optical fiber 117 is provided in the take-out port 108c of Fig. 11.

The take-out port 108c of FIG. 11 guides the light reflected by the inner wall 108a to the optical fiber 117. The light guided to the optical fiber 117 is incident on the optical fiber 117, and is detected by the light receiving element 105a and the light receiving element 121a, and the optical characteristics are measured by the photodetector 105 and the spectroscope 121.

The other structure of the optical measuring device 3 of the second modification is the same as that of the optical measuring device 3 of the first modification shown in FIGS. 10A to 10C.

Modification 3 of the optical measuring device 3 will be described with reference to Figs. 12A and 12B.

FIG. 12A is a view for explaining a third modification of the optical measuring apparatus 3. Fig. 12B is a view for explaining light refraction in the lens 202 shown in Fig. 12A.

The optical measuring device 3 of the third modification has more structure of the lens 202 than the optical measuring device 3 of the first modification.

The lens 202 is a lens for collecting light emitted from the light-emitting element 101 to be measured to the bundled fiber 118.

The lens 202 is constructed using, for example, a plano-convex lens.

The lens 202 is disposed between the bundled optical fiber 118 and the light-emitting element 101 to be measured, and is opposed to both of them. The lens 202 is disposed substantially in parallel with the entrance port 118c of the bundled fiber 118 and the light-emitting surface 101a of the light-emitting element 101 to be measured.

The central axis of the lens 202 is substantially the same as the central axis of illumination LCA of the light-emitting element 101 to be measured.

As shown in FIG. 12A, the cross section of the lens 202 perpendicular to the central axis of illumination LCA is the same as the cross section of the bundled optical fiber 118 perpendicular to the central axis of illumination LCA. However, as shown in FIG. 12A, the size of the cross section of the lens 202 is such a size that it does not cover the light-emitting element 101 adjacent to the light-emitting element 101 to be measured.

As shown in FIG. 12B, once the light emitted from the light-emitting element 101 to be measured is incident on the lens 202, it is refracted toward the incident port 118c of the bundled fiber 118. However, the unexpected light emitted from the light-emitting element 101 other than the measurement target is not refracted toward the entrance 118c even if it enters the lens 202. Therefore, the unexpected light emitted from the light-emitting element 101 of the measurement object is hard to be incident on the bundled optical fiber 118. In this way, the optical measuring device 3 of the third modification does not measure the unexpected light emitted from the light-emitting element 101 other than the measurement target, and the light-emitting element 101 can be measured by the light-receiving element 105a and the light-receiving element 121a. The light emitted.

Further, in the optical measuring device 3 of the third modification, the light emitted from the light-emitting element 101 to be measured is collected by the lens 202 to the bundled fiber 118. Therefore, even if the optical measuring device 3 of the third modification is displaced by the bundled optical fiber 118 or the like, the measurement accuracy can be suppressed more than when the lens 202 is not used. It is also easier to perform the alignment operation of the bundled optical fiber 118 or the like.

As described above, the optical measuring device 3 of the third modification can restrict the light incident on the bundled optical fiber 118 by using the lens 202, and adjust the detection ranges of the light receiving element 105a and the light receiving element 121a.

The lens 202 constitutes an adjustment unit included in the optical measurement device 3 of the third modification.

In addition, the optical measuring device 3 of the third modification may include a moving mechanism that moves the lens 202 in the vertical direction along the light emission center axis LCA of the light-emitting element 101 to be measured. Once the position of the lens 202 in the up and down direction is changed, the range of light that can be incident on the entrance port 118c of the bundled fiber 118 is changed. Thereby, the optical measuring apparatus 3 of the modification 3 can adjust the detection range of the light receiving element 105a and the light receiving element 121a.

The moving mechanism for moving the lens 202 along the central axis of the light emission LCA also constitutes the modification 3 An adjustment unit provided in the optical measurement device 3.

The other structure of the optical measuring device 3 of the third modification is the same as that of the optical measuring device 3 of the first modification shown in FIGS. 10A to 10C.

Modification 4 of the optical measuring device 3 will be described with reference to Figs. 13A and 13B.

FIG. 13A is a view for explaining a fourth modification of the optical measuring apparatus 3. Fig. 13B is a view showing the light-emitting element 101 and the bundled optical fiber 119 shown in Fig. 13A as seen from the direction of the light-emitting central axis LCA.

The optical measuring device 3 of the fourth modification includes the bundled optical fiber 119 having a structure different from that of the bundled optical fiber 118 included in the optical measuring device 3 of the first modification.

The bundled fiber 119 is the same as the bundled fiber 118, and is composed of a plurality of fibers 117 bundled.

The entrance port 119c of the bundled fiber 119 is disposed to face the light-emitting surface 101a of the light-emitting element 101 to be measured. The optical fiber 117 on the central axis of the bundled optical fiber 119 has substantially the same central axis as the emission central axis LCA of the light-emitting element 101 to be measured.

One or more optical fibers 117 near the central axis of the bundled fiber 119 are connected to the beam splitter 121. The photodetector 105 is connected to a plurality of optical fibers 117 other than the vicinity of the central axis of the bundled optical fiber 119.

In FIGS. 13A and 13B, one or a plurality of optical fibers 117 in the vicinity of the central axis of the bundled optical fiber 119 are shown in black, and a plurality of optical fibers 117 other than the vicinity of the central axis of the bundled optical fiber 119 are shown in white. The same is true in FIGS. 14A to 14C.

As shown in FIG. 13A and FIG. 13B, the cross-section of the bundled optical fiber 119 perpendicular to the central axis of the light emission LCA is larger than the light-emitting surface 101a of the light-emitting element 101 to be measured, and is a plurality of light-emitting elements that cover the measurement target. The size of 101 degrees.

The range S ₂ indicated by the numerical aperture of the bundled fiber 119 is larger than the range S ₁ indicated by the numerical aperture of the bundled fiber 118. In addition to the light-emitting element 101 to be measured, the light-emitting element 101 other than the measurement target is included in the range S ₂ .

Since the range S ₂ of the optical measuring apparatus 3 of the fourth modification is larger than the range S ₁ , the light emitted from the light-emitting element 101 which is incident on the bundled optical fiber 119 is larger than that when it is incident on the bundled optical fiber 118. Therefore, in the optical measuring device 3 of the fourth modification, the light receiving element 105a and the light receiving element 121a can detect more light, and the amount of light can be measured with higher precision. It is also easier to perform the alignment operation of the bundled optical fiber 119 or the like.

The central axis of the bundled optical fiber 119 of the optical measuring device 3 of the fourth modification is substantially the same as the central axis of illumination LCA of the light-emitting element 101 to be measured, and only the optical fiber 117 near the central axis of the bundled optical fiber 119 is connected to the optical splitter 121. . Therefore, the light-receiving element 121a of the spectroscope 121 that measures the chromaticity or the like does not detect the unintended light emitted from the light-emitting element 101 other than the measurement target, and can detect the light emitted from the light-emitting element 101 to be measured. . Therefore, the optical measuring device 3 of the fourth modification can measure chromaticity and the like with high precision.

In the optical measuring device 3 of the fourth modification, the plurality of optical fibers 117 other than the vicinity of the central axis of the bundled optical fiber 119 are connected to the photodetector 105, and therefore, the light of the light-emitting surface 101a of the light-emitting element 101 other than the measurement target can be measured. Intensity distribution.

Further, in the optical measuring device 3 of the fourth modification, the light-emitting element 101 other than the measurement target is also located in the range S ₂ of the bundled optical fiber 119. Therefore, the optical measuring device 3 of the fourth modification can measure the light-emitting element 101 that is opposed to the optical fiber 117 connected to the spectroscope 121 as a measurement target for measurement of chromaticity or the like, and the remaining plurality of light-emitting elements 101 can be used as measurement targets for measurement of the amount of light. . In other words, the optical measuring device 3 of the fourth modification can simultaneously measure the chromaticity and the like and measure the amount of light.

The other structure of the optical measuring device 3 of the fourth modification is the same as that of the optical measuring device 3 of the first modification shown in FIGS. 10A to 10C.

A modification 5 of the optical measuring apparatus 3 will be described with reference to Figs. 14A to 14C.

FIG. 14A is a view for explaining a fifth modification of the optical measuring apparatus 3.

FIG. 14B is a view for explaining another example 1 in the fifth modification of the optical measuring apparatus 3. 14C is a view for explaining another example 2 in the fifth modification of the optical measuring device 3.

The optical measuring device 3 of the fifth modification has a larger structure of the lenticular lens array 203 or the microlens array 204 than the optical measuring device 3 of the fourth modification.

The lenticular lens array 203 is such that a plurality of lenticular lenses 203a are arranged substantially in parallel with each other.

The lenticular lens 203a is a lens that allows light emitted from the light-emitting element 101 to be internally reflected and guided to the bundled fiber 119.

The lenticular lens 203a is configured using, for example, a lens having birefringence. The refractive index in the vicinity of the central axis of the lenticular lens 203a is larger than the refractive index in the vicinity of the outer periphery.

The lenticular lens 203a is disposed between the bundled optical fiber 119 and the light-emitting element 101. The end surface of the lenticular lens 203a faces the entrance port 119c of the bundled fiber 119 and the light-emitting surface 101a of the light-emitting element 101.

The central axis of the lenticular lens 203a is substantially parallel to the illuminating central axis LCA of the light-emitting element 101. The central axis of the lenticular lens 203a disposed at the center of the lenticular lens array 203 is substantially the same as the illuminating central axis LCA of the light-emitting element 101 to be measured.

The cross section of the lenticular lens 203a perpendicular to the central axis of the light emission LCA is smaller than the light emitting surface 101a of the light-emitting element 101.

The cross-section of the lenticular lens array 203 perpendicular to the central axis of illumination LCA is equal to or slightly larger than the cross-section of the bundled optical fiber 119 perpendicular to the central axis of illumination LCA.

Light emitted from the light-emitting element 101 to be measured is incident on the lenticular lens 203a disposed at the center of the lenticular lens array 203. The light incident on the lenticular lens 203a disposed at the center is repeatedly reflected inside the lenticular lens 203a disposed at the center. Then, the light incident on the lenticular lens 203a disposed at the center is guided toward the entrance port 117c of the optical fiber 117 near the central axis of the bundled fiber 119. However, it is difficult for the unexpected light emitted from the light-emitting element 101 other than the measurement target to enter the lenticular lens 203a disposed at the center. As a result, the optical measuring device 3 of the fifth modification does not detect the unintended light emitted from the light-emitting element 101 other than the measurement target, and can be detected by the light-receiving element 121a as a measurement pair. Light emitted by the light-emitting element 101. Therefore, the optical measuring apparatus 3 of the fifth modification shown in FIG. 14A can measure chromaticity and the like with high precision. Further, as described above, only the optical fiber 117 near the central axis of the bundled optical fiber 119 is connected to the spectroscope 121 having the light receiving element 121a.

Further, as shown in FIG. 14B, the optical measuring device 3 of the fifth modification may use the microlens array 204 instead of the lenticular lens array 203.

Further, as shown in FIG. 14C, the optical measuring device 3 of the fifth modification may be provided with a through hole 204a at the center of the microlens array 204. An optical fiber 117 near the central axis of the bundled optical fiber 119 may be inserted into the through hole 204a. Further, only the optical fiber 117 near the central axis of the bundled optical fiber 119 may be connected to the spectroscope 121 having the light receiving element 121a.

In the optical measuring device 3 of the fifth modification shown in FIG. 14C, the light emitted from the light-emitting element 101 to be measured is directly incident on the optical fiber 117 near the central axis of the bundled optical fiber 119 without passing through the microlens array 204. Therefore, the optical measuring device 3 of the fifth modification shown in FIG. 14C can measure chromaticity or the like with higher precision. Furthermore, the reproducibility of the measurement such as the chromaticity can be improved.

As described above, the optical measuring device 3 of the fifth modification can restrict the light incident on the bundled optical fiber 119 by using the lenticular lens array 203 or the microlens array 204, and adjust the detection ranges of the light receiving element 105a and the light receiving element 121a.

The lenticular lens array 203 or the microlens array 204 constitutes an adjustment unit included in the optical measurement device 3 of the fifth modification.

In addition, the optical measuring device 3 of the fifth modification may include a moving mechanism that moves the lenticular lens array 203 or the microlens array 204 in the vertical direction along the light emission center axis LCA of the light-emitting element 101 to be measured. Once the position of the lenticular lens array 203 or the microlens array 204 in the up and down direction is changed, the range of light that can be incident on the incident opening 119c of the bundled optical fiber 119 is changed. Thereby, the optical measuring apparatus 3 of the modification 5 can adjust the detection range of the light receiving element 105a and the light receiving element 121a.

Moving the lenticular lens array 203 or the microlens array 204 along the central axis of illumination LCA The moving mechanism may constitute an adjusting unit provided in the optical measuring device 3 of the fifth modification.

The other structure of the optical measuring device 3 of the fifth modification is the same as that of the optical measuring device 3 of the fourth modification shown in FIGS. 13A and 13B.

A modification 6 of the optical measuring device 3 will be described with reference to Figs. 15A and 15B.

FIG. 15A is a view for explaining a sixth modification of the optical measuring apparatus 3. Fig. 15B is a view showing the light receiving element 105a of the photodetector 105 shown in Fig. 15A viewed from the direction of the light emission center axis LCA.

The optical measuring device 3 of the sixth modification has a structure in which the light receiving element 105a of the photodetector 105 is provided around the distal end of the optical fiber head 117a of the optical fiber 117 included in the optical measuring device 3 shown in FIG.

As shown in FIG. 15B, the optical measuring apparatus 3 of the sixth modification is provided with a plurality of light receiving elements 105a, and a gap 105b is formed in the center of the plurality of light receiving elements 105a.

The optical fiber head 117a of the optical fiber 117 is inserted and fixed in the gap 105b.

The light-receiving surface of the four light-receiving elements 105a and the optical fiber 117 are arranged to face the light-emitting surface 101a of the light-emitting element 101. The size of the light receiving surface of the four light receiving elements 105a can be larger than the light emitting surface 101a of the light emitting element 101 to be measured. The size of the light receiving surface of the four light receiving elements 105a is much larger than the incident surface 117c of the optical fiber 117.

The optical fiber 117 included in the optical measuring device 3 of the modification 6 is connected only to the spectroscope 121.

A part of the light emitted from the light-emitting element 101 to be measured is incident on the optical fiber 117, is detected by the light-receiving element 121a, and the chromaticity or the like is measured by the spectroscope 121.

Further, most of the light emitted from the light-emitting element 101 to be measured, which is not incident on the optical fiber 117, is directly detected by the light-receiving element 105a without passing through the optical fiber 117, and the light amount is detected by the photodetector 105.

In the optical measuring device 3 of the sixth modification, the light emitted from the light-emitting element 101 to be measured is directly detected by the light-receiving surface of the four light-receiving elements 105a which are much larger than the entrance port 117c of the optical fiber 117. Therefore, the optical measuring device 3 of the modification 6 and the optical measuring device shown in FIG. 4 In comparison with the third aspect, it is possible to detect a larger amount of light than when the light receiving element 105a is used, and it is possible to measure the amount of light with higher accuracy.

The other structure of the optical measuring device 3 of the sixth modification is the same as that of the optical measuring device 3 shown in Fig. 4 .

A modification 7 of the optical measuring apparatus 3 will be described with reference to Fig. 16 .

FIG. 16 is a view for explaining a modification 7 of the optical measuring apparatus 3.

The optical measuring device 3 of the seventh modification has a larger structure of the integrating sphere 108 than the optical measuring device 3 of the sixth modification. Further, the optical measuring device 3 of the seventh modification has a structure in which the light receiving elements 105a of the optical measuring device according to the sixth modification are disposed at different positions.

The integrating sphere 108 of the optical measuring device 3 of the seventh modification has the same structure as the integrating sphere 108 included in the optical measuring device 3 of the second modification shown in FIG.

In the optical measuring device 3 of the seventh modification, the entrance port 117c of the optical fiber 117 is disposed on the inlet 108b of the integrating sphere 108. The inlet 108b of the integrating sphere 108 and the entrance port 117c of the optical fiber 117 are disposed to face the light-emitting surface 101a of the light-emitting element 101 to be measured. The size of the inlet 108b of the integrating sphere 108 is much larger than the entrance port 117c of the optical fiber 117.

The optical fiber 117 included in the optical measuring device 3 of the seventh modification is connected only to the spectroscope 121.

The light receiving element 105a of the optical measuring device 3 of the seventh modification is disposed on the take-out port 108c of the integrating sphere 108.

A part of the light emitted from the light-emitting element 101 to be measured is incident on the optical fiber 117, is detected by the light-receiving element 121a, and the chromaticity or the like is measured by the spectroscope 121.

Further, most of the light emitted from the light-emitting element 101 to be measured, which is not incident on the optical fiber 117, is guided from the inlet 108b to the inside of the integrating sphere 108. The light guided from the intake port 108b to the inside of the integrating sphere 108 is repeatedly reflected on the inner wall 108a, and reaches the take-out port 108c. Then, the light reaching the take-out port 108c is detected by the light-receiving element 105a, and the amount of light is measured by the photodetector 105.

The optical measuring device 3 of the seventh modification emits the light-emitting element 101 as the measurement target. The light is taken in by the inlet 108b of the integrating sphere 108 which is much larger than the entrance port 117c of the optical fiber 117. Further, the optical measuring device 3 of the seventh modification directly detects the light taken in by the integrating sphere 108 by the light receiving element 105a provided at the take-out port 108c. Therefore, the optical measuring device 3 of the seventh modification can detect the amount of light with higher accuracy than the optical measuring device 3 of the sixth modification, and can detect more light than when the light receiving element 105a is used.

The other structure of the optical measuring device 3 of the seventh modification is the same as that of the optical measuring device 3 of the sixth modification shown in FIGS. 15A and 15B.

A modification 8 of the optical measuring device 3 will be described with reference to Fig. 17 .

FIG. 17 is a view for explaining a modification 8 of the optical measuring apparatus 3.

The optical measuring device 3 of the eighth modification has a structure in place of the tube 205 of the diaphragm 201 included in the optical measuring device 3 shown in Fig. 5 .

The tube 205 is for blocking a part of the light emitted from the light-emitting element 101 to be measured, and restricts the light incident on the optical fiber 117.

The tube 205 is formed by an absorbing member that absorbs light.

The tube 205 has the fiber end 117a of the optical fiber 117 as a base end, and the distal end thereof extends toward the light-emitting element 101 to be measured. The opening 205a at the top end of the tube 205 is opposed to the light-emitting surface 101a of the light-emitting element 101 and the entrance port 117c of the optical fiber 117.

The central axis of the tube 205 and the opening 205a is substantially the same as the central axis of illumination LCA of the light-emitting element 101 to be measured.

The size of the opening 205a is equal to or slightly larger than the size of the light-emitting surface 101a of the light-emitting element 101. However, as shown in FIG. 17, the size of the opening 205a is such a size that it does not cover the light-emitting element 101 adjacent to the light-emitting element 101 to be measured.

The tube 205 is formed by the absorbing member, so that light incident on the inner peripheral surface of the tube 205 is not reflected but is directly absorbed. The light incident on the optical fiber 117 is light that is not incident on the inner circumferential surface of the tube 205 and directly from the opening 205a of the tube 205 toward the entrance port 117c. The range of the light is formed by the line connecting the periphery of the opening 205a and the line of the entrance port 117c and the center axis of illumination LCA. The size of the angle β is specified. That is, the range of light incident on the optical fiber 117 is defined by the angle β. Further, Fig. 17 shows an example in which the angle β is smaller than the angle α for specifying the numerical aperture NA of the optical fiber 117.

On the other hand, the length of the tube 205 defines the position of the opening 205a in the up and down direction. Thus, the length of the tube 205 defines the magnitude of the angle β.

Therefore, the length of the tube 205 defines the range of light incident on the optical fiber 117.

The length of the tube 205 included in the optical measuring device 3 of the eighth modification is such that the angle β is such that the light-emitting element 101 other than the measurement target is not included in the range of the light incident on the inside of the tube 205.

Therefore, unintended light emitted from the light-emitting element 101 other than the measurement target is not incident on the optical fiber 117 of the optical measuring device 3 of the eighth modification. As a result, the optical measuring device 3 of the eighth modification does not detect the unintended light emitted from the light-emitting element 101 other than the measurement target, and the light-emitting element 101 can be detected by the light-receiving element 105a and the light-receiving element 121a. The light emitted.

As described above, the optical measuring device 3 of the eighth modification can restrict the light incident on the optical fiber 117 by using the tube 205, and adjust the detection range of the light receiving element 105a and the light receiving element 121a.

The tube 205 constitutes an adjustment unit included in the optical measurement device 3 of the eighth modification.

Further, the optical measuring device 3 of the eighth modification may be provided with a mechanism for changing the length of the tube 205. Once the length of the tube 205 is changed, the angle β also changes, changing the range of light that can be incident on the fiber 117. Thereby, the optical measuring device 3 of the eighth modification can adjust the detection range of the light receiving element 105a and the light receiving element 121a.

The mechanism for changing the length of the tube 205 also constitutes an adjustment unit provided in the optical measuring device 3 of the eighth modification.

The other structure of the optical measuring device 3 of the eighth modification is the same as that of the optical measuring device 3 shown in Fig. 4 .

A modification 9 of the optical measuring device 3 will be described with reference to Fig. 18 .

FIG. 18 is a view for explaining a modification 9 of the optical measuring apparatus 3.

The optical measuring device 3 of the ninth modification has a larger structure of the integrating sphere 108 than the optical measuring device 3 of the eighth modification.

The tube 205 included in the optical measuring device 3 of the ninth embodiment is based on the inlet 108b of the integrating sphere 108, and the distal end thereof extends toward the light-emitting element 101 to be measured.

The optical fiber 117 included in the optical measuring device 3 of the modification 9 is provided on the take-out port 108c of the integrating sphere 108.

The light incident on the optical fiber 117 is light that is taken in from the intake port 108b to the inside of the integrating sphere 108. Next, the light taken into the inside of the integrating sphere 108 from the inlet 108b is the same as the optical measuring apparatus 3 of the eighth modification, and is light that directly faces the inlet 108b from the opening 205a. That is, the light incident on the optical fiber 117 is light directly from the opening 205a toward the intake port 108b. The range of the light is defined by the magnitude of the angle γ formed by the line connecting the periphery of the inlet 108b and the periphery of the opening 205a with the central axis of the light emission LCA. Further, FIG. 18 shows an example in which the angle γ is larger than the angle α for specifying the numerical aperture NA of the optical fiber 117.

The length of the tube 205 of the optical measuring device 3 of the ninth embodiment is such that the angle γ is such that the light incident on the inside of the tube 205 does not include the light-emitting element 101 other than the measurement target. The length of the light. Similarly to the optical measuring device 3 of the eighth modification, since the length of the tube 205 is defined by the angle γ, the range of light incident on the optical fiber 117 is defined.

As a result, light emitted from the light-emitting element 101 to be measured is incident on the optical fiber 117 of the optical measuring device 3 of the ninth modification, and the unexpected light incident from the light-emitting element 101 other than the measurement target is not incident. The optical fiber 117 of the optical measuring device 3 of Modification 9. As a result, the optical measuring device 3 of the ninth embodiment does not detect the unintended light emitted from the light-emitting element 101 other than the measurement target, and the light-emitting element 101 can be detected by the light-receiving element 105a and the light-receiving element 121a. The light emitted.

In this way, the optical measuring device 3 of Modification 9 can use the tube 205 to restrict the incidence to The light of the optical fiber 117 adjusts the detection range of the light receiving element 105a and the light receiving element 121a.

The tube 205 constitutes an adjustment unit included in the optical measuring device 3 of the ninth modification.

Further, similarly to the optical measuring device 3 of the eighth modification, the optical measuring device 3 of the modified example 9 may include a mechanism for changing the length of the tube 205.

The mechanism for changing the length of the tube 205 also constitutes an adjustment unit provided in the optical measuring device 3 of the ninth modification.

The other structure of the optical measuring apparatus 3 of the modification 9 is the same as that of the optical measuring apparatus 3 of the modification 8 shown in FIG.

A modification 10 of the optical measuring apparatus 3 will be described with reference to Figs. 19 to 20 .

19A is a view for explaining a modification 10 of the optical measuring device 3. Fig. 19B is a view showing the shielding plate 206 and the light-emitting element 101 shown in Fig. 19A as seen from the direction of the light-emitting central axis LCA. FIG. 20 is a view for explaining another example of the modification 10 of the optical measuring apparatus 3.

The optical measuring device 3 of the modification 10 is provided with a structure of the shielding plate 206 instead of the tube 205 included in the optical measuring device 3 of the modification 9.

The shielding plate 206 is a shielding member that blocks light emitted from the light-emitting element 101 to be measured from entering the light-emitting element 101 other than the measurement target.

The shielding plate 206 shown in Fig. 19 is a plate that divides the space between adjacent light-emitting elements 101 from each other.

The shielding plate 206 is disposed between the inlet 108b of the integrating sphere 108 and the light emitting element 101. The opening 206a of the shielding plate 206 is adjacent to the inlet 108b of the integrating sphere 108 and the mounting table 103 on which the light-emitting element 101 is placed. The light-emitting element 101 to be measured can be placed inside the closed space formed by the integrating sphere 108 and the shielding plate 206.

The shielding plate 206 shields the light emitted from the light-emitting element 101 that is the measurement target from the light-emitting element 101 other than the measurement target. Therefore, unintended light emitted from the light-emitting element 101 other than the measurement target does not occur. Therefore, the light incident on the optical fiber 117 is limited to The light emitted by the light-emitting element 101 of the object is measured. As a result, the optical measuring device 3 of the modification 10 does not detect the unintended light emitted from the light-emitting element 101 other than the measurement target, and can detect the light-emitting element 101 to be measured by the light-receiving element 105a and the light-receiving element 121a. The light emitted.

Further, as shown in FIG. 20, the optical measuring device 3 of Modification 10 can use the reflector 207 instead of the shielding plate 206.

The reflector 207 is a tube that divides a space between the light-emitting element 101 to be measured and the light-emitting element 101 other than the light-emitting element 101.

The reflector 207 is disposed between the inlet 108b of the integrating sphere 108 and the light-emitting element 101 to be measured. The reflector 207 is fixed to the inlet 108b of the integrating sphere 108. The distal end of the reflector 207 is adjacent to the mounting table 103 on which the light-emitting element 101 to be measured is placed. The light-emitting element 101 to be measured can be placed inside the closed space formed by the integrating sphere 108 and the reflector 207.

Therefore, the optical measuring device 3 according to the modification 10 shown in FIG. 20 restricts the light incident on the optical fiber 117 to the light emitted from the light-emitting element 101 to be measured.

Further, the reflector 207 is formed in a tubular shape whose inner diameter gradually increases toward the integrating sphere 108. The inner peripheral surface of the reflector 207 is coated with a high reflectance material. Therefore, the light emitted from the light-emitting element 101 as the measurement target can be reflected by the inner peripheral surface of the reflector 207 toward the inlet 108b of the integrating sphere 108. As a result, the optical measuring device 3 according to the modified example 10 of the reflector 207 has more light incident on the optical fiber 117 than when the shielding plate 206 is used. Therefore, the amount of light can be measured with higher precision.

As described above, the optical measuring device 3 of the modification 10 can restrict the light incident on the optical fiber 117 by using the shielding plate 206 or the reflector 207, and adjust the detection range of the light receiving element 105a and the light receiving element 121a.

The shielding plate 206 and the reflector 207 constitute an adjustment unit included in the optical measuring device 3 of the modification 10.

The other structure of the optical measuring apparatus 3 of the modification 10 is the same as that of the optical measuring apparatus 3 of the modification 9 shown in FIG. 18.

A modification 11 of the optical measuring apparatus 3 will be described with reference to Figs. 21 to 23 .

FIG. 21 is a view for explaining a modification 11 of the optical measuring apparatus 3. Fig. 22 is a flowchart for explaining processing performed when the control unit 151 shown in Fig. 21 performs optical characteristic measurement. FIG. 23 is a view for explaining another example of the eleventh modification of the optical measuring apparatus 3.

The optical measuring device 3 of the modification 11 has a larger structure of the optical waveguide 120 and the light amount adjuster 122 than the optical measuring device 3 shown in FIGS. 2 to 9B.

The optical measuring device 3 of the eleventh embodiment can branch the optical transmission path 117b of the optical fiber 117 using the optical waveguide 120.

The optical waveguide 120 branches the optical transmission path 117b into a first path 117d toward the spectroscope 121 and a second path 117e toward the photodetector 105. The first path 117d is an optical transmission path 117b connecting the optical waveguide 120 and the spectroscope 121. The second path 117e is an optical transmission path 117b connecting the optical waveguide 120 and the photodetector 105.

The optical waveguide 120 totally reflects the incident light inside thereof to suppress the transmission loss as much as possible, and branches and guides the light to the first path 117d and the second path 117e.

The light amount adjuster 122 adjusts the amount of light detected by the light receiving element 121a of the spectroscope 121.

The light amount adjuster 122 is disposed on the first path 177d that connects the optical transmission path 117b between the optical waveguide 120 and the optical splitter 121.

The light amount adjuster 122 can be constituted by a filter such as an ND filter (Neutral Density Filter) for attenuating the amount of light. Alternatively, the light amount adjuster 122 may be composed of an electro-optical element, a magneto-optical element, an acousto-optic element, or a liquid crystal optical element.

The light amount adjuster 122 is connected to the control unit 151.

Further, the light amount adjuster 122 is configured to adjust the amount of attenuation of light passing therethrough.

The amount of attenuation adjusted by the light amount adjuster 122 is set by the control unit 151.

The amount of attenuation adjusted by the light amount adjuster 122 is appropriately set in order to control the amount of incident light entering the spectroscope 121 within the dynamic range of the photoelectric conversion characteristics of the spectroscope 121. Mainly, different attenuation amounts are set in accordance with the type of the light-emitting element 101. Further, the light amount adjuster 122 also has a configuration in which the amount of attenuation is zero.

Here, the "photoelectric conversion characteristic" of the spectroscope 121 is the relationship between the amount of incident light in the spectroscope 121 and the output current.

In addition, the proportional relationship between input and output is called "linear". Furthermore, the range in which the proportional relationship between input and output is established is referred to as "dynamic range". The dynamic range is a range in which linearity is established.

The dynamic range in the photoelectric conversion characteristics of the spectroscope 121 is a range in which the proportional relationship between the incident light amount and the output current is established, and is also a range in which the photoelectric conversion characteristics are linearly established.

The dynamic range in the photoelectric conversion characteristics of the spectroscope 121 is narrower than that of the photodetector 105. Therefore, when the optical characteristics of the light-emitting element 101 are measured using the spectroscope 121, the measurement result of the spectroscope 121 may be incorrect due to the amount of incident light entering the spectroscope 121.

Therefore, there is a need for a technique capable of measuring the optical characteristics of the light-emitting element 101 with high reliability.

In addition, the light-emitting characteristics of different types of light-emitting elements 101 are often different depending on the type. Therefore, when measuring the optical characteristics of the different types of light-emitting elements 101, there is often a case where the amount of incident light entering the spectroscope 121 is different. Therefore, it is necessary to adjust the appropriate amount of incident light in accordance with each type of the light-emitting element 101. However, in order to adjust the amount of incident light entering the spectroscope 121, the measurement environment is changed depending on the respective types of the light-emitting elements 101, which causes a great burden.

Therefore, there is a need for a technique capable of measuring with high precision in the same measurement environment even when measuring optical characteristics of different types of light-emitting elements 101.

Therefore, the optical measuring device 3 of the modification 11 is provided with the light amount adjuster 122.

The control unit 151 included in the optical measuring apparatus 3 of the modification 11 will be described with reference to FIG. The processing performed when the optical characteristics were measured.

In step S10, the control unit 151 determines whether or not the light amount measurement result of the photodetector 105 and the measurement result of the spectroscope 121 have been input.

The control unit 151 waits until the light amount measurement result of the photodetector 105 and the measurement result of the spectroscope 121 are input. On the other hand, when the control unit 151 determines that the light amount measurement result of the photodetector 105 and the measurement result of the spectroscope 121 have been input, the control unit 151 stores the corresponding results in a predetermined storage area. Next, the control unit 151 executes step S20.

In step S20, the control unit 151 verifies the accuracy of the measurement result of the spectroscope 121 based on the light amount measurement result of the photodetector 105.

The control unit 151 can verify the measurement result of the spectroscope 121 using, for example, the following method.

For example, the control unit 151 confirms the light amount measurement result included in the measurement result of the spectroscope 121 input in step S10. Next, the control unit 151 obtains the difference between the light amount measurement result of the spectroscope 121 and the light amount measurement result of the photodetector 105 input in step S10. Then, the control unit 151 determines whether the difference is within a predetermined allowable range. Then, if the difference is within the predetermined allowable range, the control unit 151 determines that the measurement result of the spectroscope 121 input in step S10 is correct. On the other hand, if the difference is not within the predetermined allowable range, the control unit 151 determines that the measurement result of the spectroscope 121 input in step S10 is incorrect.

Further, for example, the control unit 151 stores in advance a range of the light amount measurement result of the spectroscope 121 acquired in the dynamic range of the photoelectric conversion characteristics of the spectroscope 121. Next, the control unit 151 determines whether or not the light amount measurement result of the photodetector 105 input in step S10 is within the range of the light amount measurement result of the spectroscope 121 stored in advance. Then, if the light amount measurement result of the photodetector 105 input in step S10 is within the range of the light amount measurement result of the spectroscope 121 stored in advance, the control unit 151 determines the spectroscope 121 input in step S10. The measurement result is correct. On the other hand, if input in step S10 When the light amount measurement result of the photodetector 105 is not within the range of the light amount measurement result of the spectroscope 121 stored in advance, the control unit 151 determines that the measurement result of the spectroscope 121 input in step S10 is incorrect.

In step S30, the control unit 151 determines whether or not the measurement result of the spectroscope 121 is correct.

When the control unit 151 determines that the measurement result of the spectroscope 121 is correct by the verification of step S20, step S40 is executed. On the other hand, when the control unit 151 determines that the measurement result of the spectroscope 121 is incorrect by the verification of step S20, step S60 is executed.

In step S40, the control unit 151 makes the measurement result of the spectroscope 121 valid.

In step S50, the control unit 151 outputs the measurement result of the spectroscope 121 to the output unit 163. Next, the control unit 151 ends the measurement of the optical characteristics.

The measurement result of the spectroscope 121 is outputted by the output unit 163.

In step S60, the control unit 151 invalidates the measurement result of the spectroscope 121.

In step S70, the control unit 151 controls the light amount adjuster 122.

The control unit 151 confirms the measurement result of the spectroscope 121 that was invalidated in step S60 and the light amount measurement result of the photodetector 105 associated with the result. Next, the control unit 151 obtains the attenuation amount adjusted by the light amount adjuster 122 based on the light amount measurement result. The control unit 151 outputs a control signal including the obtained attenuation amount to the light amount adjuster 122, and sets the attenuation amount of the light amount adjuster 122.

The control unit 151 can determine the amount of attenuation that can be adjusted by the light amount adjuster 122 using, for example, the following method.

For example, in the verification of step S20, the control unit 151 obtains the difference between the light quantity measurement result of the spectroscope 121 and the light quantity measurement result of the photodetector 105, and verifies the difference, and obtains the difference so that the difference can be controlled at the difference. The amount of attenuation within the allowable range of values.

Further, for example, when the control unit 151 performs verification in the step S20, using the range of the light amount measurement result of the spectroscope 121 acquired in the dynamic range of the photoelectric conversion characteristics of the spectroscope 121, the following method can be used. That is, the control unit 151 is based on the range of The difference between the threshold value and the light amount measurement result of the photodetector 105 is used to determine the amount of attenuation in the optical attenuator 123.

In step S80, the control unit 151 instructs the photodetector 105 and the spectroscope 121 to perform measurement again.

The control unit 151 outputs a control signal to the photodetector 105 and the spectroscope 121, and instructs the photodetector 105 and the spectroscope 121 to perform the re-measurement.

When the measurement is performed again, the spectroscope 121 can detect the light attenuated by the attenuation amount set in step S70, and measure the optical characteristics. Then, the measurement result of the spectroscope 121 measured again is input again to the control unit 151, and the verification in step S20 is performed. Thereby, the measurement results of the spectroscope 121 outputted in step S50 are all highly reliable measurements.

As a result, the optical measuring device 3 of the eleventh embodiment can selectively make the measurement result of the spectroscope 121 effective based on the measurement result of the light amount measured by the photodetector 105 having a larger dynamic range than the spectroscope 121.

Therefore, in the optical measurement device 3 of the modification 11, when the optical characteristics of the light-emitting element 101 are measured, only the measurement result with high reliability can be effectively output.

Thereby, the measurement result of the optical characteristics of the optical measuring apparatus 3 of the modification 11 can have high reliability.

Further, if the measurement result of the spectroscope 121 is incorrect, the optical measuring device 3 of Modification 11 automatically adjusts the incident light of the spectroscope 121 to an appropriate amount of light. Further, the optical measuring device 3 of Modification 11 can cause the spectroscope 121 to measure the optical characteristics of the incident light adjusted to an appropriate amount of light again.

Therefore, even when the optical measuring device 3 of the eleventh embodiment measures the optical specificity of the light-emitting element 101 having different light-emitting characteristics, it is possible to automatically maintain the plausibility of the amount of incident light entering the spectroscope 121 without changing the measurement environment.

Thereby, the optical measuring device 3 of Modification 11 can be highly accurate in the same measurement environment. The optical characteristics of the light-emitting elements 101 of different types were measured.

Further, in the optical measuring device 3 of the eleventh modification, the amount of attenuation adjusted by the light amount adjuster 122 can be set based on the measurement result of the light amount measured by the photodetector 105, as in the optical measuring device 3 shown in Figs. 21 and 22 . .

The optical measuring device 3 according to the modification 11 can set the amount of attenuation adjusted by the light amount adjuster 122 based on the light amount measurement result included in the measurement result measured by the spectroscope 121.

At this time, as shown in FIG. 23, the optical measuring apparatus 3 of the modification 11 can be configured such that the optical waveguide 120, the photodetector 105, and the amplifier 113 are omitted.

When the photodetector 105 is omitted, the control unit 151 shown in FIG. 23 can verify the accuracy of the measurement result measured by the spectroscope 121 using the following method. This verification corresponds to a part of the processing in step S20 of Fig. 22 .

The control unit 151 shown in FIG. 23 stores in advance a range of the light amount measurement result of the spectroscope 121 that can be obtained in the dynamic range of the photoelectric conversion characteristics of the spectroscope 121. Next, the control unit 151 determines whether or not the light amount measurement result measured by the spectroscope 121 is within the range of the light amount measurement result stored in advance. Then, when the light amount measurement result measured by the spectroscope 121 is within the range of the light amount measurement result stored in advance, the control unit 151 determines that the measurement result measured by the spectroscope 121 is correct. On the other hand, if the measurement result of the light amount measured by the spectroscope 121 is not within the range of the measurement result of the light amount stored in advance, the control unit 151 determines that the measurement result measured by the spectroscope 121 is incorrect.

Further, in the case where the photodetector 105 is omitted, the control unit 151 shown in FIG. 23 can obtain the amount of attenuation adjusted by the light amount adjuster 122 using the following method. The calculation of the amount of attenuation corresponds to a part of the processing in step S70 of Fig. 22 .

The control unit 151 shown in FIG. 23 determines the threshold value of the range of the light amount measurement result of the spectroscope 121 which can be obtained in the dynamic range of the photoelectric conversion characteristics of the spectroscope 121, and the measurement result of the light amount measured by the spectroscope 121. The difference is the amount of attenuation.

With this configuration, the optical measuring device 3 of Modification 11 shown in FIG. 23 even omits light. The detector 105 can also automatically adjust the incident light entering the spectroscope 121 to an appropriate amount of light based on the measurement result of the light amount measured by the spectroscope 121.

Therefore, the optical measuring apparatus 3 of the modification 11 shown in FIG. 23 can obtain a highly reliable measurement result with a simpler structure than the optical measuring apparatus 3 of the modification 11 shown in FIGS. 21 and 22.

The other structure of the optical measuring device 3 of the modification 11 is the same as that of the optical measuring device 3 shown in Figs. 2 to 9B.

In the above-described embodiments, it will be apparent to those skilled in the art that the techniques of the various embodiments including the modifications can be applied to each other.

The above description is intended to be illustrative only and not limiting. Therefore, it will be apparent to those skilled in the art that the embodiments of the invention can be modified without departing from the scope of the invention.

All terms used in this specification and the scope of the patent application are to be construed as "unqualified". For example, the terms "including" or "included" should be interpreted as "included and not limited to those described." The term "having" should be interpreted as "the possession is not limited to those described." In addition, the indefinite article “a” or “an” or “an”

<Structure and Effect of Embodiment>

The optical measuring device 3 of the present embodiment is characterized in that it includes a light receiving element 105a and a light receiving element 121a for detecting light emitted from one of the light emitting elements 101 adjacent to the other light emitting elements 101, and the light receiving element 105a and the light receiving element 121a are detected. The light emitted from one of the light-emitting elements 101 is supplied to the light-emitting element 101, and the light emitted by the other light-emitting elements 101 caused by the light emitted from the light-emitting element 101 is not detected, and a light-emitting element 101 is not detected. Among the emitted light, the light reflected from the other light-emitting elements 101.

With this configuration, regardless of the arrangement pattern of the light-emitting elements 101, the optical measuring device 3 The optical characteristics of the light-emitting element 101 can be measured with high precision with a simple configuration.

The optical measuring device 3 of the present embodiment can supply only electric power to one light-emitting element 101.

With this configuration, the optical measuring device 3 can measure the optical characteristics of the light-emitting element 101 with higher precision.

Further, the optical measuring device 3 of the present embodiment may include an adjustment unit for adjusting a detection range of a range of light detected by the light receiving element 105a and the light receiving element 121a so as to supply electric power to a light emitting element 101. The light emitted from the light-emitting element 101 is detected by the light-receiving element 105a and the light-receiving element 121a, and the light emitted by the other light-emitting element 101 due to the light emitted by one light-emitting element 101, and the light emitted by a light-emitting element 101 Light reflected from the other light-emitting elements 101 is not detected by the light-receiving element 105a and the light-receiving element 121a.

With this configuration, the optical measuring device 3 can measure the optical characteristics of the light-emitting element 101 with high precision with a simple configuration regardless of the arrangement pattern of the light-emitting elements 101.

Further, the optical measuring apparatus 3 of the present embodiment may include an optical fiber 117 for causing light emitted from one light-emitting element 101 to be incident, and guiding the incident light to the light-receiving element 105a and the light-receiving element 121a, and the adjustment section may be The light incident on the optical fiber 117 is limited to adjust the detection range.

With this configuration, the optical measuring device 3 can measure the optical characteristics of the light-emitting element 101 with a simpler configuration.

Further, each of the light-emitting elements 101 and the other light-emitting elements 101 in the optical measuring device 3 of the present embodiment may include a generating portion 101b that generates light of a specific wavelength range when power is supplied, and a wavelength converting portion 101c that is paired The wavelength of the incident light is wavelength converted. The adjustment unit can limit the light emitted by the other light-emitting elements 101 caused by the light emitted from one light-emitting element 101 to the wavelength conversion portion 101c of the other light-emitting elements 101, and the other light emitted from the light emitted by the light-emitting element 101. The light reflected by the element 101 is incident on Optical fiber 117.

With this configuration, the optical measuring device 3 can accurately measure the optical characteristics of the light-emitting element 101 including the generating portion 101b and the wavelength converting portion 101c with a simple structure regardless of the arrangement pattern of the light-emitting elements 101.

Further, in the optical measuring apparatus 3 of the present embodiment, the entrance port 117c of the optical fiber 117 on which the light emitted from the light-emitting element 101 is incident is disposed to face the light-emitting element 101. The adjusting portion can limit the light incident to the optical fiber 117 by changing the distance L between the incident opening 117c and a light emitting element 101 in accordance with the numerical aperture NA of the optical fiber 117.

With this configuration, the optical measuring device 3 can measure the optical characteristics of the light-emitting element 101 including the generating portion 101b and the wavelength converting portion 101c with a simpler structure.

Further, the optical measuring apparatus 3 of the present embodiment defines the maximum value of the incident angle of the light totally reflected in the optical fiber 117 as α, from the center of one light-emitting element 101 to the other light-emitting element 101 adjacent to one light-emitting element 101. The distance from the outer edge is defined as X, and the adjustment portion changes the distance L between the entrance port and a light-emitting element 101 so that the distance L satisfies the relationship of L ≦ X / tan α.

With this configuration, the optical measuring device 3 can measure the optical characteristics of the light-emitting element 101 including the generating portion 101b and the wavelength converting portion 101c with a simpler structure.

The incident port 117c of the optical fiber 117 through which light emitted from a light-emitting element 101 is incident is disposed opposite to a light-emitting element 101. The adjusting portion may be configured by a shielding member disposed between the incident port 117c and a light emitting element 101 for blocking light emitted from a light emitting element 101 from entering the other light emitting element 101, and the light incident on the optical fiber 117 is restricted by the shielding member. .

With this configuration, the optical measuring device 3 can measure the optical characteristics of the light-emitting element 101 including the generating portion 101b and the wavelength converting portion 101c with a simpler structure.

<define, etc.>

An example of the "one light-emitting element" of the present invention is a light-emitting element 101 that is a measurement target among a plurality of light-emitting elements 101 arranged in series.

An example of the "other light-emitting element" of the present invention is a light-emitting element 101 other than the measurement target among the plurality of light-emitting elements 101 arranged in series.

Generally, in each measurement, the light-emitting elements 101 to be measured are different. In other words, the difference between the "one light-emitting element" of the present invention and the "other light-emitting element" is only the measurement target, and the structure thereof can be substantially the same.

The light receiving element 105a and the light receiving element 121a are examples of the "light receiving element" of the present invention.

The adjustment mechanism of the distance L and the diaphragm 201 are examples of the "adjustment unit" of the present invention. Other examples have been properly described in the specification.

The optical fiber 117, the bundled optical fiber 118, and the bundled optical fiber 119 are examples of the "light guide tube" of the present invention.

The generating unit 101b is an example of the "generating unit" of the present invention.

The wavelength conversion unit 101c is an example of the "wavelength conversion unit" of the present invention.

The entrance port 117c is an example of the "incident port" of the present invention.

The shielding plate 206 and the reflector 207 are examples of the "shielding member" of the present invention.

101‧‧‧Lighting elements

101a‧‧‧Lighting surface

101b‧‧‧Generation Department

101c‧‧‧wavelength conversion unit

117‧‧‧ fiber optic

117a‧‧‧Fiber head

117b‧‧‧Light transmission path

117c‧‧‧ entrance port

A‧‧‧Distance from the center of the light-emitting element 101 to be measured to the outer edge

A‧‧‧ Distance from the center of the light-emitting element 101 to be measured to the outer edge of the generating portion 101b

B‧‧‧Distance between adjacent light-emitting elements 101

D‧‧‧ The distance from the center of the light-emitting element 101 to the outer edge of the range S ₀ when the range S _{0 is} projected onto the light-emitting element 101

L‧‧‧ Distance between the light-emitting element 101 and the optical fiber 117 to be measured

LCA‧‧‧Lighting Center Shaft

S ₀ ‧‧‧The range indicated by the numerical aperture NA

X‧‧‧ Distance from the center of the light-emitting element 101 to be measured to the outer edge of the light-emitting element 101 adjacent to the light-emitting element 101 to be measured

α‧‧‧Maximum angle of incidence of light obtained by total reflection in fiber 117

Claims (4)

An optical measuring apparatus comprising: a light receiving element that detects light emitted by a light emitting element that is adjacent to another light emitting element including a wavelength converting portion that wavelength-converts a wavelength of incident light; and a light guide tube An entrance port for allowing light emitted by the light-emitting element to be incident, and guiding light incident from the entrance port to the light-receiving element; and an adjustment portion that adjusts a distance between the entrance port and the light-emitting element, and Adjusting a range of light detected by the light receiving element, that is, a detection range; the light receiving element detects light emitted by the light emitting element by supplying electric power to the light emitting element; and the adjusting portion adjusts the distance so that only a light-emitting element is located within the detection range that is conically narrowed toward the entrance port, whereby light emitted through the light-emitting element is incident on the wavelength conversion portion of the other light-emitting element and the other light-emitting element is emitted The light reflected from the other light-emitting elements among the light emitted by the light-emitting element is not detected by the light-receiving element. The optical measuring device according to claim 1, wherein the detecting range is an outer edge of a portion corresponding to a maximum value of an incident angle of light obtained by total reflection in the light guiding tube. The optical measuring device according to claim 2, wherein an entrance of the light guiding tube to which light emitted by the light emitting element is incident is disposed opposite to the light emitting element; and the adjusting portion is configured according to the light guiding tube The numerical aperture changes the distance between the entrance port and the light-emitting element to limit the light incident on the light pipe. The optical measuring device according to any one of claims 1 to 3, wherein The maximum value of the incident angle of the light obtained by total reflection in the light pipe is defined as α, and the distance from the center of the light-emitting element to the outer edge of the other light-emitting element adjacent to the light-emitting element is defined as X, The adjustment portion changes the distance L between the entrance port and the one light-emitting element such that the distance L satisfies the relationship of L≦X/tanα.