CN100510518C - Illumination unit and illumination apparatus - Google Patents

Abstract

Provided are a lighting device by which a lighting area having a constant flat illuminance distribution is obtained under high illuminance while saving electric power, and which can extend an irradiation distance, and a lighting device including the lighting unit. A lighting unit 100 using a light emitting diode 17 as a light source is provided with a light emitting unit having a plurality of light emitting diodes 17 on a base 19; a reflective member 25 which reflects the light from the light emitting diode 17 toward the direction of the light-emitting side to be substantially parallel-corrected; and a pair of second reflective members arranged on the light-emitting side of the first reflective member , the second reflective member reflects the light from the light emitting diode 17 that is not incident on the first reflective member 25 toward the direction of the light emitting side to be substantially parallel-corrected.

Description

Lighting units and lighting equipment

technical field

The present invention relates to a lighting unit using an LED as a light source and a lighting device including the lighting unit.

Background technique

As conventional lighting equipment, various types of lighting sources such as fluorescent lamps, incandescent lamps, and spotlights are used. However, the illuminating light from such an illuminating light source includes ultraviolet rays that damage an irradiated target, or the illuminating light source has installation restrictions due to heat generation. Considering environmental issues such as _CO2 reduction, it is desirable for light sources to have as little power consumption as possible. Recently, an LED light source that generates a small amount of heat and has low power consumption has attracted considerable attention, and also provides a white LED with high luminance. Therefore, the use of LED light sources in general lighting equipment is increasing. Since LED has high brightness and high calorific value, it is suitable for power consumption. However, since LEDs contain no ultraviolet or infrared light, it does little damage to the illuminated target. An example of such a lighting device is disclosed in JP-A-2000-021209.

[Patent Document 1] JP-A-2000-021209

Contents of the invention

Problems solved by the present invention

However, even though the LED has high directivity, the illuminance distribution of direct light obtained by the LED becomes wider as the irradiation distance increases. Furthermore, since the irradiated area is excessively enlarged, the illuminance becomes insufficient. FIG. 34A shows the illuminance distribution on the surface at a predetermined distance when the LED 81 emitting light as a single body is not provided with a reflective surface. When the LED 81 as a single body emits light on the surface at a predetermined distance, a wide light distribution is obtained at low luminance, as shown in FIG. 34A. Therefore, a structure in which a reflective surface is provided in an LED light source has been proposed. However, although the reflective surface returns light directed to the side or back of the LED light source to the front side, it is difficult to say that the reflective surface has excellent light focusing characteristics. In addition, the illuminance distribution may also be broadened, and unnecessary areas may be illuminated. Because of this environment, light sources with high brightness are used to obtain the required and sufficient illuminance. In order to limit the area to be irradiated, unnecessary light is cut off by a light shielding member such as a louver.

However, a high-brightness light source uses a large amount of electric power, and is also large in size. Therefore, the light source has many constraints when mounted on lighting equipment, and its application range is limited. In addition, light-shielding members such as louvers may reduce light use efficiency, thus still leaving many problems to be solved.

Generally, as an illumination light source, a light source is required by which an illumination area with a flat illuminance distribution is obtained under high illuminance. As shown in FIG. 34B , a reflection plate 83 having a concave parabolic surface is provided in the side (or rear side) of the LED 81. Then, the light from the LED 81 is collimated by the reflection plate 83, thereby increasing the luminous flux density. The reachable distance of the light can also be extended by means of the reflector. Furthermore, although the light component emitted to the LED 81 side is deflected by the reflective plate 83 , the light component 86 not irradiated on the reflective plate 83 proceeds to the front side of the optical path while being scattered. Therefore, although the illuminance distribution of illuminance is improved by the reflection plate 83 , a wide distribution is shown, and an illumination area having a flat illuminance distribution is not sufficiently obtained at a high illuminance required for illumination. In addition, when the LED 81 emits light at a small illumination angle such as 10°, the light emitted from the LED 81 is not irradiated on the reflective plate 83, and the substantially undeflected component increases, so that improvement in illuminance cannot be expected.

Consider using lenses to extend the reachable distance of light. However, arranging lenses increases the number of parts, thereby increasing costs, degrading assembly performance, and requiring additional operations such as adjusting the optical axis. Thus, there are many difficulties in realizing lighting devices at low cost.

The advantage of the present invention is that it provides a lighting unit by which a lighting area with a constant flat illuminance distribution is obtained at high illuminance while saving electric power and the light irradiation distance can be extended without producing colors in the lighting area dimming or shadowing, and a lighting device comprising the lighting unit is provided.

way of solving the problem

(1) According to the first aspect of the present invention, a lighting unit using a light emitting diode as a light source includes a light emitting unit having a plurality of light emitting diodes arranged on a base; A first reflective part provided with a light emitting diode, each first reflective part has a parabolic surface, the focal position of the parabolic surface is the light emitting surface of the light emitting diode; and a pair of second reflective parts, parallel to the first light passing through the light emitting diode The light emitting diodes on the light emitting side of the reflective member are arranged in the direction in which the light emitting diodes are arranged, and each second reflective member has a plate-shaped reflective surface that reflects light from the light emitting diodes toward the light emitting side.

According to the lighting unit, the first reflection member reflects the light from the light emitting diode toward the light emitting side, and the second reflection member reflects the light from the light emitting diode toward the light emitting side. Then, while electric power is saved, uniform illuminance distribution can be obtained under high illuminance, and the irradiation distance can be extended.

When the light from the light emitting diode is reflected by the first reflective part, the reflective section of the first reflective part is a parabolic surface, which can generate parallel light with high precision, thereby improving the illuminance.

When the light from the light emitting diode is reflected by the second reflective member, the reflective portion of the second reflective member is formed in a plate shape, and the boundary of the irradiation range of the reflected light can be made clear.

In addition, the plate-shaped reflective faces are arranged in a direction perpendicular to the arrangement direction of the light emitting diodes crossing the first reflective part, so that light from the two reflective faces is concentrated to increase illuminance.

(2), in the lighting unit of (1), when the boundary line between the luminous flux from the light-emitting diode emitted from the first reflective part and its shadow on the second reflective part is set as the first boundary line, and from When the boundary line between the luminous flux of other LEDs adjacent to the LED and its shadow on the second reflective member is set as the second boundary line, the height at which the second reflective member protrudes into the light-emitting side is set as Above the point on the second reflective member where the first and second boundary lines intersect for the first time.

According to the lighting unit, the height of the second reflective part is set higher than the first boundary line between the luminous flux emitted from the first reflective part and its shadow on the second reflective part and the light from another adjacent LED. The point at which the second boundary line between the luminous flux and its shadow on the second reflective part first crosses. Then, when the light flux from the light emitting diode is not irradiated on the second reflective part arranged in the surface of the second reflective part, a shadow is generated, which does not reach (spread) on the light emitting side beyond the second reflective part. As a result, darkening or shadowing of the illumination light produced when the shadow is output together with the luminous flux does not occur.

(3) According to the second aspect of the present invention, a lighting unit using light-emitting diodes as a light source includes a light-emitting unit with a plurality of light-emitting diodes arranged on a base; The first reflective parts provided by the light-emitting diodes, each first reflective part is formed by a parabolic surface, the focal position of which is the light-emitting surface of the light-emitting diode; A reflective member, the plate-shaped reflective surface reflects the light from the light-emitting diode toward the direction of the light-emitting side. When the boundary line between the luminous flux from the light-emitting diode emitted from the first reflective part and its shadow on the second reflective part is set as the first boundary line, and the luminous flux from other light-emitting diodes adjacent to the light-emitting diode and the When the boundary line between the shadows on the second reflective part is set as the second boundary line, the height of the second reflective part protruding into the light-emitting side is set higher than the first and second boundary lines among them for the first time Point of intersection on the second reflective component.

According to the lighting unit, the first reflection member reflects the light from the light emitting diode toward the light emitting side, and the second reflection member reflects the light from the light emitting diode toward the light emitting side. Then, while electric power is saved, uniform illuminance distribution can be obtained under high illuminance, and the irradiation distance can be extended. In addition, the height of the second reflective part is set higher than the first boundary line between the luminous flux emitted from the first reflective part and its shadow on the second reflective part and the luminous flux from another adjacent LED and at the The point on the second reflective part where the second boundary lines between its shadows first intersect. Then, the shadow produced when the light flux from the LED is not irradiated on the second reflective part arranged in the surface of the second reflective part does not reach (spread) beyond the light emitting side of the second reflective part. As a result, darkening or shadowing of the illumination light produced when the shadow is output together with the luminous flux does not occur.

(4), in the lighting unit of (3), a plurality of light emitting diodes are arranged in a plurality of rows, and in both outer sides of the arrangement direction of the plurality of light emitting diode rows, relative to the arrangement of the light emitting diodes in the row of light emitting diodes The second reflective member pairs are arranged in parallel.

According to the lighting unit, the light directly incident on the second reflective member from the light emitting diode is focused by the two reflective surfaces in the second reflective member pair, so as to increase the illuminance.

(5) In the lighting unit of (4), the rows of light emitting diodes are arranged in a zigzag pattern, and in the row direction between adjacent rows of light emitting diodes, the arrangement pitch of the first reflective members in the rows of light emitting diodes is changed by 1/2 spacing.

According to the lighting unit, the first reflective members are arranged in a zigzag pattern between adjacent rows of light emitting diodes. Therefore, it is possible to arrange the first light emitting units in positions close to each other, in which shadows not illuminated by light emitted from the first reflection member are reduced, and darkening or shadowing of illumination light caused by the shadows is suppressed.

(6) In the lighting unit of (4) or (5), between a row of light emitting diodes and another row of light emitting diodes adjacent thereto, in the direction of light emission, the light emitting diodes between each row have steps.

According to the lighting unit, the boundary line (for example, the first boundary line) of one side crossing the top corner is parallel to the direction of the light emitting diode through the step of one adjacent light emitting diode (step in the receding direction on the side opposite to the light emitting direction) moved, thereby reducing the substantially triangular shadow sandwiched between the first and second boundary lines to be formed on the surface of the second reflective member. That is, as shading is reduced, darkening of the color of illumination light or generation of shading is suppressed.

(7) In the lighting unit of any one of (1) to (6), the reflection surfaces of the first and second reflection members are formed of mirror surfaces coated by evaporation.

According to this lighting unit, the reflective surface is processed by an evaporative coating process, for example, by a sputter plating process. The sputter plating process includes application of an undercoat of a special primer, aluminum evaporation in a vacuum, and clear coating of urethane into the aluminum evaporation surface. Even on a complex surface to be deposited, such as a parabolic surface of a resin product, a uniform mirror surface can be formed, and a reflective surface with high reflectivity can be formed.

(8). In the lighting unit according to any one of (1) to (6), at least one reflective surface of the first and second reflective members is smooth processed.

According to this lighting unit, light reflected by the smooth-processed reflective surface appears to be specular reflection in a wide perspective view, but is diffuse reflection in a microscopic perspective view. As a result, light of different frequency (waveform) components dispersed to separate colors is mixed.

(9), in the lighting unit of any one of (1) to (8), the light-emitting diode is a white light-emitting diode with a blue light-emitting diode and a phosphor that converts the blue light component from the blue light-emitting diode into a yellow light component .

According to the lighting unit, if the blue light emitted from the blue light diode is absorbed by the phosphor, the phosphor emits yellow light, and the yellow light is mixed with the non-absorbed blue light. Then, the emitted light from the LED becomes white light.

(10) According to a third aspect of the present invention, a lighting device comprising the lighting unit according to any one of (1) to (9); and a driving unit providing electric power for driving the light emitting diode to emit light.

According to the lighting device, if commercial power is supplied to the driving unit, the driving unit supplies driving power to the light emitting diodes. Then, the light emitting diodes are driven to emit light at high illuminance and at uniform illuminance distribution while electric power is saved.

Advantages of the invention

According to the lighting unit and lighting apparatus, electric power can be saved, a lighting area having a constant flat illuminance distribution can be obtained under high illuminance, and the irradiation distance can be extended. Therefore, the energy efficiency of light can be improved, thereby significantly reducing the emission of CO ₂ which has an impact on the environment. In addition, darkening of the color of illumination light or generation of shadows can be prevented, so that uniform illumination with high quality can be performed.

Description of drawings

Fig. 1 shows a structural diagram of a first embodiment of a lighting device according to the present invention.

Fig. 2A illustrates a side view of the lighting unit, and Fig. 2B is a bottom view thereof.

Fig. 3 illustrates an exploded perspective view of a light emitting unit.

Fig. 4 is a cross-sectional view of the lighting unit shown in Fig. 2, taken along the line A-A.

Figure 5 shows a graph of the lighting distribution through the lighting unit.

FIG. 6 is an explanatory view showing the state of the reflector member seen from the light emitting side when the LED is turned on.

7 is a conceptual graph for examining the relationship between the emission luminance of a light source and the distance of the light source passing through the lighting unit according to the presence or absence of a reflective surface or its kind.

Fig. 8 shows the correlation curve between the relative intensity of the relative spectral distribution and the waveform.

Fig. 9 shows a cross-sectional view of the height at which the second reflective part protrudes into the light-emitting side.

FIG. 10 shows a schematic view of a surface illuminated by a lighting unit with a second reflective part, the height of which is set to H _M of FIG. 9 .

FIG. 11A schematically shows an explanatory view of irradiation light of the present invention, and FIGS. 11B and 11C schematically show explanatory views of irradiation light of comparative examples.

Fig. 12 is a perspective view of a lighting unit according to a second embodiment, wherein the reflective surface is formed of a smooth machined surface.

FIG. 13 illustrates a cross-sectional view of the reflector member shown in FIG. 10 .

Fig. 14 shows an explanatory view of the distribution of illumination through a lighting unit, the reflective surface of which is formed by a smooth machined surface.

Fig. 15 shows an explanatory view of a situation where an adjacent location is illuminated by a lighting device.

Fig. 16 is an explanatory view showing a plurality of arranged lighting units and illuminance distribution through the lighting units according to the third embodiment.

FIG. 17A illustrates a cross-sectional view of a donut-shaped lighting unit according to a fifth embodiment, and FIG. 17B illustrates a bottom view of the donut-shaped lighting unit.

Fig. 18 shows cross-sectional views of structural examples of reflector members having different cross-sectional structures.

19A is a plan view illustrating a lighting unit in which light emitting diodes are arranged in two rows, and FIG. 19B illustrates a cross-sectional view of the light emitting unit, along line B-B thereof.

FIG. 20A illustrates a plan view of a modified example in which the lighting units shown in FIG. 19 are arranged in rows, and FIG. 20B illustrates a cross-sectional view of the modified example along line C-C.

21A illustrates a plan view of a lighting unit in which light emitting diodes are arranged in three rows, and FIG. 21B illustrates a cross-sectional view of the light emitting unit along line D-D.

Fig. 22 illustrates an illustrative view of a lighting unit having a plurality of light emitting diodes in a different arrangement.

FIG. 23 is a graph showing the measurement results of the illuminance distribution of Comparative Example 1-1.

FIG. 24 is a graph showing the measurement results of the illuminance distribution of Comparative Example 1-2.

Fig. 25 is a graph showing the measurement results of the illuminance distribution of Example 1-1.

Fig. 26 shows a graph of the lighting performance of Example 3-1.

Fig. 27 is a graph showing the light distribution performance of Example 3-1.

Fig. 28 shows a graph of the illuminance performance of Example 3-2.

Fig. 29 is a graph showing the light distribution performance of Example 3-2.

Figure 30 shows a graph of the illuminance performance of Example 3-3.

Fig. 31 shows a graph of the light distribution performance of Example 3-3.

Fig. 32 is a graph showing the lighting performance of Comparative Example 3-1.

Fig. 33 is a graph showing the light distribution performance of Comparative Example 3-1.

34A and 34B illustrate schematic views of a lighting device according to the related art.

reference number

11 drive unit

17 LED (Light Emitting Diode)

21 luminous parts

25 first reflective part

25a Parabolic mirror (parabolic surface)

25b parabolic mirror (smooth machined surface)

27 Second reflective part

27a flat mirror (plate-shaped reflective surface)

27b flat mirror (smooth processing reflective surface)

45 First boundary line

47 Second boundary line

51 shades

100, 300, 400, 500, 600, 700, 700A, 700B, 700C lighting unit

200 lighting equipment

G steps

HM Height of the second reflective part protruding into the light-emitting side

Detailed ways

Hereinafter, preferred embodiments of a lighting unit and a lighting apparatus according to the present invention will be described with reference to the accompanying drawings.

(first embodiment)

Fig. 1 is a drawing illustrating an overall structure of a first embodiment of a lighting device according to the present invention.

The lighting device 200 according to the first embodiment of the present invention includes a lighting unit 100 and a driving unit 11 .

The driving unit 11 provides light-emitting driving power to the lighting unit 100, and a full-range transformer may be used as the driving unit. The driving unit 11 is connected to a commercial power supply to convert electric power in the range of AC110 to 220V/50Hz to 60Hz into a driving voltage of DC 12V (any voltage that can be used, such as DC 6V or DC 24V or alternating current), and then converts the converted driving The voltage is supplied to the lighting unit 100 .

The lighting unit 100 includes a back plate 15, a light emitting unit 21 having a plurality of light emitting diodes (LEDs) 17 arranged in a line on a wiring substrate 19 serving as a base, and a reflector member 23. The back plate 15 may be separately assembled to the reflector member 23 with the wiring substrate 19 interposed therebetween.

The LED 17 has a blue light diode and a phosphor that converts the blue light component from the blue light diode into a yellow light component. In the LED 17, when the blue light component emitted from the blue light diode is absorbed by the phosphor, the phosphor emits a yellow light component. When the unabsorbed blue light component is mixed with the yellow light component, a white light component is emitted as an output light component.

FIG. 2A illustrates a side view of the lighting unit, FIG. 2B is a bottom view thereof, and FIG. 3 is an exploded perspective view thereof.

As shown in FIGS. 2A and 2B , the lighting unit 100 has a height H in a state where the back plate 15 is assembled to the reflective member 23 . In this embodiment, the height H is about 20 mm, which is much smaller than the case of using a heat-emitting bulb or a fluorescent lamp as a light source. When the height H is excessively small, the deflection performance of the reflector member 23 is impaired. When the height H is excessively large, the degree of freedom in arrangement of the lighting unit 100 is reduced because an installation space is required. Therefore, the height H is preferably set within a range of 15 to 30 mm, or more preferably within a range of 20 to 23 mm.

The reflector member 23 is integrally provided with a long-plate-shaped mounting base 24 (refer to FIG. 3 ), to which the first reflecting member 25 is attached, as shown in FIG. 2B , and has a plurality (in this embodiment Among them, sixteen) reflective surfaces (parabolic mirrors) 25a, each reflective surface is constituted by a parabolic surface, and has an opening in the center so that the light-emitting side is opened, and a second reflective member 27 is provided on the first reflective member 25 on the light-emitting side of the parabolic mirror 25a, and has a plate-shaped reflective surface (flat mirror) 27a parallel to the arrangement direction of the parabolic mirror 25a. Since the flat mirror pair 27a is formed in a direction perpendicular to the arrangement direction of the parabolic mirror 25a, in the arrangement direction, each side of the second reflection member 27 is connected to the parabolic wall 27, wherein the parabola mirror of the first reflection member 25 is extend. In resin molding in which the reflector member 23 is integrally molded by injection molding, the reflective surfaces of the first and second reflector members 25 and 27 are subjected to a coating process by at least electroplating or an aluminum evaporation method. Not limited to these, other common devices can be used as the reflective surface.

The reflection surfaces of the first and second reflection members 25 and 27 (parabolic mirror 25a and flat mirror 27a) are processed by an evaporation coating process, for example, a sputter plating process. The sputter plating process includes the application of a base coat using a proprietary primer, aluminum evaporation in vacuum, and urethane clear coating onto the aluminum evaporated surface. Even on an irregular surface to be deposited, such as a parabolic surface of a resin product, a uniform mirror surface can be formed, and a reflective surface with high reflectivity can be formed.

As shown in FIG. 3, the back plate 15 includes an umbrella member 29 having a V-shaped cross-sectional surface, ribs 30 are arranged in the inner surface of the umbrella member 29 so as to support the back surface of the wiring substrate 19, and in the inner surface of the umbrella member 29 Lock hooks 31 are arranged at a plurality of positions (in this embodiment, five) in the longitudinal direction so as to engage with the reflector member 23 . The locking hook 31 is formed in a hook shape having a U-shaped sectional surface.

The wiring substrate 19 is, for example, a printed circuit board having a plurality (in the embodiment, sixteen) of LEDs 17 mounted in line so as to correspond to the respective parabolic mirrors 25a in the longitudinal direction of the reflector member 23. The lead wire 33 is pulled out from the side to be connected to the drive unit 11 (refer to FIG. 1 ). Since the wiring substrate 19 is a one-side mounted module, when an abnormality occurs, it is easy to find a problem, and its maintainability is excellent.

In the reflector member 23, a bracket 37 for fixing the lighting unit 100 is formed in both sides of the long-plate-shaped mounting base 24, and is provided with the back plate 15 in the upper and lower directions of the mounting base 524 in FIG. The locking hook 31 engages the engaging part 39 . The engaging part 39 is detachably coupled with the hook 31 of the back plate 15 by a snap action, with the wiring substrate 19 interposed between the engaging part 39 and the back plate 15 .

When the reflector member 23, the wiring substrate 19, and the back plate 15 are combined with each other, the light emitting surface of the LED 17 is placed in the focal position of the parabolic mirror of the first reflector member 25. In other words, in the reflector member 23 , the adjoining surfaces are separately arranged on the surface of the wiring substrate 19 . The abutment surface is formed to have such a height that the light-emitting surface of the LED 17 is disposed in the focal position of the parabolic mirror. Further, the ribs 30 of the back plate 15 are set to have a height at which the wiring substrate 19 is pressed on the abutment surface when the wiring substrate 19 is arranged in the substrate storage position formed in the reflector member 23 .

Thereby, when the reflector member 23, the wiring substrate 19, and the back plate 15 are simply bonded to each other, the focus position of the parabolic mirror and the position of the light emitting surface of the LED 17 coincide with each other with high precision. This structure allows the above elements to be simply joined to each other without using a reinforcement method such as screws used. Therefore, the number of parts is reduced and the number of processes for assembling or is reduced, so that productivity is improved.

Next, optical characteristics of the lighting unit 100 having such a structure will be described.

Fig. 4 is a cross-sectional view of the lighting unit shown in Fig. 2, taken along the line A-A.

The reflector part 23 of the lighting unit 100 has first and second reflective parts 25 and 27 formed continuously to each other. In the base end portion of the first reflecting member 25, an opening 41 is provided in which the light emitting surface of the LED is arranged in the focal position of the parabolic mirror 25a. The parabolic mirror 25a of the first reflective member 25 has a reflective surface having a parabolic surface in which the focal point position is set as the light-emitting surface of the LED 17, and reflects light from the LED 17 toward the direction of the light-emitting side so that the light from the LED 17 is reflected in a wide In the perspective view, it is basically aligned parallel.

The second reflective member 27 provided on the light emitting side of the first reflective member 25 has a flat mirror 27a arranged in parallel with respect to the arrangement direction of the parabolic mirror 25a, that is, with respect to the arrangement direction of the LED 17. The second reflective member 27 receives the light from the LED 17 that is not irradiated on the first reflective member 25 to reflect the light toward the direction of the light emitting side to be substantially collimated. The first reflective part 25 has a predetermined reflective surface area M1, and the second reflective part 27 has a predetermined reflective surface area M2 continuous to the reflective surface area M1. Therefore, in a wide perspective, the light reflected by the first and second reflection members 25 and 27 becomes a large amount of parallel light to be irradiated on the object.

With respect to the optical axis of the LED 17, the inclination angle of the flat mirror 27a is set to an angle at which the luminous flux from the LED 17 that is not irradiated on the first reflecting member 25 is collimated in parallel. In the case of this embodiment, the tilt angle is set in the range of 20° to 27° with respect to the optical axis of the LED.

Here, the LED 17 has a wide illumination angle, such as 120°. Although the number of optical components emitted toward the side increases among the emitted light, this light component is captured by the first and second reflection members 25 and 27, thereby contributing to parallel correction of the light. Thereby, the illuminance distribution can be further uniformed.

Next, the illuminance distribution through the lighting unit 100 will be described

Fig. 5 shows a graph of the illuminance distribution through the lighting unit.

As shown in FIG. 5 , the amount of light in the range W1 formed by the light component directly irradiated from the LED 17 and the light component arriving through the reflection of the first and second reflection members 25 and 27 is larger than other areas, and the boundary thereof clearly appears. . This is because the light is focused and the luminous flux is substantially parallel-corrected in the range W1 so that the range W1 becomes a state where the emitted illuminance is high.

Fig. 6 is an explanatory view showing the state of the reflector member seen from the light emitting side when the LED emits light.

As shown in FIG. 6, the light emitting surface 17a of the LED 17 is the center of the LED element 17. The light emitting surface 17 a projects an image on the entire surface of the parabolic mirror 25 a of the first reflection member 25 . In addition, the image of the light emitting surface 17 a is also projected onto the flat mirrors 27 a and 27 a of the second reflection member 27 . That is, due to its diffusion, only the first reflective member 25 diffuses the light component directly irradiated from the LED 17, but the plate mirror 27a of the second reflective member 27 diffuses the scattered light component to be deflected to be Parallel correction. This action increases the emitted illuminance of the luminous flux to be obtained and allows a precise homogenization of the illuminance distribution within the range W1. As a result, the boundary of the range W1 is clearly seen.

Next, the range of light from the lighting unit 100 will be described.

7 is a conceptual graph examining the relationship between the emission luminance of the light source and the distance from the light source by the lighting unit in the embodiment according to the presence or absence of a reflective surface or its kind.

When a target is set at a long distance from a light source such as a street lamp, or when constituting a distance for a warning light or the like to notify the position of a light source, the reachable distance of light determines the performance of the lighting device. For example, Figure 7 shows that the range of light from a light source varies depending on the reflective surface.

As shown in FIG. 7 , the extreme range of emitted brightness is indicated by oblique lines, in which the position of the light source can be identified. When the reflector is not provided, the brightness becomes insufficient beyond the distance Ln. When only the parabolic mirror is provided, at the distance Ln the lighting unit has an allowable emission brightness, but beyond the distance Lp the brightness becomes insufficient. On the other hand, when the parabolic mirror 25a and the flat mirror 27a are provided as in the present invention, the lighting device has sufficient brightness up to the distance Lpp away from the distances Ln and Lp. Such a structure according to the present invention can remarkably extend the light range by the synergistic effect between the parabolic mirror 25a and the flat mirror 27a. For example, when the total flux of the light source is set at 42.81 m, a brightness of 1200 lx is obtained at a distance Ln of 15 cm, a brightness of 1000 lx is obtained at a distance Lp of 30 cm, and even a brightness of 2 lx is obtained at a distance of 30 m.

Fig. 8 shows the correlation curve between the relative intensity of the relative spectral distribution and the waveform.

In the relative spectral distribution, light with high intensity is obtained in the wave region of 450 to 480 nm, and light in the wave region of around 560 nm is obtained. The apex around the waveform at 440nm represents light emitted from the blue light diode, and the broad peak around the waveform at 560nm represents light emitted from the phosphor. Furthermore, since the light of the wave region between 365 nm to 410 nm preferred by insects is not included in the spectral distribution, the lighting device 200 can realize that no harmful insects such as moths and mosquitos fly.

Next, the projection height of the second reflection member will be described.

Fig. 9 is a cross-sectional view showing the height at which the second reflective member protrudes into the light emitting side. FIG. 10 is a schematic view showing a surface irradiated by the lighting unit having the second reflective member, the height of which is set as H _M of FIG. 9 . FIG. 11A is an explanatory view schematically showing irradiation light of the present invention, and FIGS. 11B and 11C are explanatory views schematically showing irradiation light of comparative examples.

Thus, in the lighting unit 100, the height _HM at which the second reflective member 27 protrudes into the light emitting side is defined as a predetermined height. That is, when the boundary line between the luminous flux from the LED 17 and its shadow on the surface (flat mirror 27a) of the second reflection member 27 is set as the first boundary line 45, the luminous flux from the LED 17 is reflected from the first Part 25 emission, and the boundary line between the luminous flux from other LED 17 adjacent to LED 17 and its shadow on the surface (flat mirror 27a) of second reflection part 27 is set as second boundary line 47, the second The height H _M of the reflective member 27 protruding into the light-emitting side is set to be greater than the height H _s of the point 49 on the second reflective member 27 where the first boundary line 45 and the second boundary line 47 intersect for the first time, as shown in FIG. 9 shown.

In other words, the height H _M of the second reflective member 27 protruding into the light emitting side is set so that the shadow 51 generated in the second reflective member 27 can be maintained without reaching beyond the second reflective member 27 on the light emitting side. height, as shown in Figure 10. When the luminous flux from the LED 17 is not irradiated on the second reflective member 27 , a shadow 51 is generated, and the luminous flux from the LED 17 is emitted from the first reflective member 25 .

As shown in FIG. 11A, the height _HM of the second reflection member 27 is defined as such a value. When the luminous flux from the LED 17 is not irradiated on the second reflective part 27, the shadow 51 generated on the second reflective part 27 is arranged within the surface of the second reflective part 27 and does not propagate beyond the light emitting side of the second reflective part 27. . Therefore, the influence of the shadow 51 that makes the uneven distribution of light is reduced, and uniform illumination light with high quality is obtained.

On the other hand, when the height H _M of the second reflective part deviates from the range defined above, as shown in FIG. 11B, or when the second reflective part does not exist, as shown in FIG. A darkened or meshed shade 51a of the illuminating light is produced. As a result, the illumination light becomes uneven.

As described above, according to the lighting unit 100 of this embodiment and the lighting device 200 including the lighting unit, the first reflection member 25 reflects the luminous flux from the LED 17 toward the direction of the light-emitting side to be substantially parallel-corrected, and the second The second reflective part 27 reflects the luminous flux from the LED 17 that is not incident on the first reflective part 25 toward the direction of the light emitting side to be substantially parallel-corrected so that the illuminance distribution becomes uniform. In addition, since the emitted illuminance is high, the irradiation distance of light can be extended. Since the LED 17 serving as a light source is provided at a low price, the lighting device itself can be manufactured at low cost. Since LEDs use less power than incandescent or fluorescent bulbs, overhead costs can be reduced. Specifically, because the illuminance and irradiation distance are improved by the first and second reflectors 25 and 27, the power consumption of the LED 17 is almost 1/6 times that of a neon lamp and 1/8 times that of a fluorescent lamp under the same illuminance. This power consumption can improve the energy efficiency of luminance, thereby helping to reduce the emission of _CO2 which has an impact on the environment.

Since the LED 17 is driven at low voltage, troubles such as electric shock accidents hardly occur after installation. In addition, since ultraviolet light and infrared light are substantially excluded, the irradiated object is not damaged.

Since the lighting unit 100 is provided with a reflector including the first and second reflective members 25 and 27 on the light emitting side of the LED 17, compared with the case where the reflector is provided in the back surface of the LED 17, it is possible to The thickness of the light source unit is made small. These are advantageous when storing the light source unit in a location such as a showcase where installation space is limited.

In addition, a plurality of LEDs 17 are arranged as a unit to constitute the light emitting unit 21. However, the light emitting unit 21 may include only one LED if desired brightness is obtained. The reflective surface of the parabolic mirror 25a of the first reflective part 25 may not be formed of a parabolic surface, but may be formed of a hyperbola. In any event, the reflective surface can be formed by a curved surface that approximates a parabolic surface, and in a parabolic surface a compact flat mirror can generally be formed.

In the lighting unit 100 according to this embodiment, with respect to the arrangement direction of the LEDs 17 crossing the LEDs 17, the second reflective member pair 27 is arranged in parallel, as shown in FIG. 4 . Thereby, by the two flat mirrors 27a and 27a in the second reflective member pair 27 and 27, the light directly incident on the second reflective member 27 from the LED 17 is focused, so as to obtain high illuminance.

In the lighting unit 100 provided with the first reflection member 25 having the parabolic mirror 25a and the second reflection member 27 having the flat mirror 27a, the height H _M of the surface of the second reflection member 27 is set higher than that of the first and second reflection members 27a. A point 49 on the second reflective member where the two boundary lines 45 and 47 intersect for the first time. Therefore, when the light is not irradiated on the second reflective member 27, the shadow 51 to be generated in the second reflective member 27 can be maintained without reaching the light-emitting side on the second reflective member 27, and the occurrence of the shadow 51 can be prevented. When 51 is output together with the luminous flux 53, the color dimming or shadow 51a of the illumination light is produced. As a result, uniform illumination light 55 with high quality can be obtained.

The lighting device 200 provided with the lighting unit 100 includes a driving unit 11 that supplies electric power for driving the LED 17. Therefore, when commercial electric power is supplied to the drive unit 11, uniform illuminance distribution is obtained at high illuminance while saving electric power. Furthermore, illumination light without any color dimming and shadows can be irradiated by an independent single system.

The definition of the height of the second reflection member 27 is applied to the embodiments to be described below, and uniform illumination light can be obtained more reliably.

(second embodiment)

Next, a second embodiment of the lighting unit according to the present invention will be described.

Fig. 12 illustrates a perspective view of a lighting unit whose reflective surface is formed by a smooth machined surface. FIG. 13 is a cross-sectional view illustrating the reflector member shown in FIG. 12 . Fig. 14 is an explanatory view showing distribution of illumination by a lighting unit whose reflective surface is formed of a smooth machined surface. In the following embodiments, the same reference numerals refer to the same elements as those shown in FIGS. 1 to 6 , and descriptions thereof will be omitted.

In the lighting unit 300 according to this embodiment, at least one reflective surface (the parabolic mirror 25b and the flat mirror 27b) of the first and second reflective members 25 and 27 is formed of a smooth machined surface.

As the coating process to which the above reflection surfaces (parabolic mirror 25b and flat mirror 27b) of the first and second reflection members 25 and 27 are subjected, processing by a sputter plating process is exemplified. The sputter plating process includes the application of a base coat using a proprietary primer, aluminum evaporation in a vacuum, and clear coating of urethane into the aluminum evaporated surface. Therefore, when the surface to be coated is processed in a rough state, the light emitting surface after the sputter plating process can be formed of a smooth processed surface.

Additionally, smooth finished reflective surfaces can be matte or glossy. Matte or glossy can be changed by preparing a base coat liquid for electroplating.

As shown in FIGS. 13 and 14, the number of the range W2 formed by the light component directly irradiated from the LED 17 and the light component arriving by reflection of the first and second reflection members 25 and 27 is larger than other areas, and the boundary of the range W2 is clearly. This is because the light is focused, and the luminous flux is substantially parallel-corrected in the range W2, so that the range w2 becomes a state where the emitted illuminance is high. In addition, compared with the case where the light emitting surface is formed of a mirror, although the maximum illuminance is slightly lowered, the range W2 in which the illuminance becomes uniform is widened, and a wider range of light emission can be performed by one lighting unit 300 . In addition, by changing the opening angle θ of the flat mirror 27b with respect to the optical axis of the LED 17, the deflection state of light can be adjusted. That is, when the opening angle θ increases, the illumination range can be widened. When the opening angle θ is reduced, light can be focused in a specific position. In this case, it is preferable that the first and second reflection members are separately provided without being integrally constituted, thereby freely adjusting the opening angle θ of the flat mirror 27b.

The above lighting unit 300 using the LED 17 of the polychromatic mixing type as a light source is provided, the first reflecting member 25 has a reflecting surface (parabolic mirror 25b) formed of a parabolic surface, the focal position of which is set as the light emitting surface of the LED 17, and the second The second reflective member 27 has a pair of plate-shaped reflective surfaces (flat mirror 27b) arranged in parallel on the light emitting side of the first reflective member 25 of the cross LED 17. Reflective surfaces of the first and second reflective members 25 and 27 are formed of smooth processed surfaces. Thus, light reflected by the smooth machined reflective surface appears specularly reflected in a broad perspective, but is diffusely reflected in a microscopic perspective, as indicated by arrow 43 in FIG. 13 . As a result, lights of different frequency (waveform) components whose colors are separated and dispersed are mixed. That is, the separate blue and yellow light is mixed with white light. As a result, the light of the LED can be focused with high efficiency, and uniform illumination light can be obtained without any dullness and shadow in the irradiated area even when the light of the LED is closely irradiated. Furthermore, the quality of the illumination light can be improved.

In addition, when the adjacent position is illuminated by the lighting device 84 provided with the white LED 82, as shown in FIG. , so that the blue area and the yellow area appear unevenly or produce shadows on the specific irradiation areas S1 and S2. Therefore, when the lighting device 100 is used as the lighting light on the desk, uniform lighting light is obtained without degrading the quality of the lighting light.

Furthermore, since the emitted light of the LED 17 is scattered with high efficiency, the need for having to arrange a plurality of LED elements 17 whose emission wavelengths have a small difference can be reduced. In the case of the lighting unit by specular reflection, the emitted light from each LED 17 is used as it is as the lighting light, and the difference in the emission wavelength is clearly distinguished in the lighting area. Therefore, in order to prevent locally different colors of illumination light from being dimmed, an LED element having a uniform emission wavelength is required. However, the reflective surface is formed of a smooth machined surface as described above so that specular reflection is converted to diffuse reflection. Although the emission wavelength of the LED varies, the light is diffused to become illumination light. Therefore, local shading is reduced, and changes in emission wavelengths are not clearly distinguished. Thus, when a smooth-finished reflective surface is to be formed, the light emitting performance of the LED element to be used as a light source does not need to be strictly selected. Furthermore, inexpensive LED elements can be used, thereby reducing the cost of the lighting device. Furthermore, although LED elements having large emission wavelength differences are produced through the LED element manufacturing process, the LED elements can be effectively utilized without being wasted. Therefore, when using the lighting unit of the present invention, the LED element manufacturing process also has advantages.

(third embodiment)

Next, a third embodiment of the lighting unit according to the present invention will be described.

In this embodiment, a structure that performs wide range illumination is provided.

Fig. 16 shows an explanatory view of a lighting unit and an illuminance distribution through the lighting unit according to this embodiment.

The lighting unit 400 of this embodiment includes a plurality of lighting units 100 shown in the first embodiment, and the plurality of lighting units 100 are arranged in parallel in an array. The arrangement interval between the respective lighting units 100 is set so that the entire illuminance distribution (indicated by one dotted chain line in the figure) in which the intensity of the illumination light components from adjacent lighting units 100 is adjusted becomes flat.

According to this structure, by arranging a plurality of lighting units, the range in which the illuminance becomes uniform can be extended, and the area to be illuminated can be widened without reducing the illuminance. Also, the lighting unit 100 may be the same as the lighting unit 300 of the second embodiment, and the lighting unit 100 and the lighting unit 300 may be combined with each other. Thereby, the intensity and uniformity of illumination light can be appropriately adjusted.

(fourth embodiment)

Next, a fourth embodiment of the lighting unit according to the present invention will be described.

In this embodiment, the lighting unit is formed in a ring shape.

Fig. 17A is a cross-sectional view of a circular-annular lighting unit, and Fig. 17B is a bottom view thereof.

In the lighting unit 500 of this embodiment, a plurality of (in this embodiment, twelve) LEDs 17 are arranged in a circumferential direction on a wiring substrate 19 formed in a ring or a circular plate. Corresponding to the respective LEDs 17, first reflection members 25 are respectively arranged. Furthermore, on the light emitting side of the first reflection member 25 , a second reflection member 27 having a ring shape is formed on the inner and outer circumferences so as to cover the first reflection member 25 . Each second reflection member 27 is formed continuously in a circle.

With the lighting unit 500 having such a structure, the entire unit is formed in a ring shape. Therefore, a range in which illuminance occurs uniformly in a circular shape, and uniform illuminance can be obtained over a wide range despite the small size of the lighting unit 500 . Even in this case, the reflective surface can be smoothed, thereby improving scattering. Furthermore, when lighting units 500 having different diameters are combined with each other, a plurality of lighting units can be arranged in concentric circles, and uniform illuminance can be obtained over a wide range despite the compactness of the units.

(fifth embodiment)

Next, a fifth embodiment of the lighting unit according to the present invention will be described.

FIG. 18 illustrates cross-sectional views of structural examples of reflector members having other cross-sectional structures.

In the lighting unit 600 of the present structure, a convex mirror 47 is arranged in front of the light path of the LED 17 serving as a light source, as shown in FIG. 18 . Therefore, most of the light emitted from the LED 17 is shone on the convex mirror 47. The light irradiated on the convex mirror 47 to be reflected is corrected in parallel by the parabolic mirror 25 a of the first reflection member 25 or the plate mirror 27 a of the second reflection member 27 . In addition, some of the light not irradiated on the convex mirror 47 is parallel corrected by the plate mirror 27 a of the second reflection member 27 . Thus, the light emitted from the LED 17 must be deflected by the first and second reflection members 25 and 27 to be parallel-corrected. Then, the light becomes directed toward the front end of the optical path in a state where the emitted illuminance is high.

As in the above example, the structure of the reflector member can be appropriately modified. In addition, the following improvements can be made.

For example, the flat mirror 27a of the second reflection member 27 may be formed of a curved mirror in order to focus light (to form an image) at a predetermined distance. In addition, the deflection state of light can be adjusted by changing the opening angle θ of the flat mirror 27a (refer to FIG. 14 ) with respect to the optical axis of the LED 17. In other words, since the opening angle θ increases, the illumination range can be widened. Because the opening angle θ is reduced, light can be focused in a specific position. In this case, it is preferable that the first and second reflection members are separately provided without being integrally constituted, thereby freely adjusting the opening angle θ of the flat mirror 27b.

(sixth preferred embodiment)

Next, a sixth embodiment of the lighting unit according to the present invention will be described.

FIG. 19A is a plan view of a lighting unit in which light emitting diodes are arranged in two rows. Fig. 19B is a cross-sectional view thereof, taken along line B-B of Fig. 19A.

In the lighting unit 700 according to this embodiment, a plurality of LEDs 17 are arranged in multiple rows (in the drawing, two rows), as shown in FIG. 19a. Corresponding to each LED 17, the first reflective member 25 is provided, and each row is arranged in a zigzag pattern, wherein the arrangement interval of each row is changed to 1/2 the arrangement pitch of the first reflective member 25 in the row direction. Subsequently, two adjacent rows L1 and L2 of the LEDs 17 and the first reflective members 25 are arranged so that the first reflective members 25 are closest to or adjacent to each other, as shown in FIG. 19B . In addition, the LED 17 and the first reflection member 25 are arranged with a step G with respect to the light emitting side.

In the outer side in the arrangement direction of the plurality of light emitting diode rows, in the light emitting diode line, the second reflection member pair 27 is arranged in parallel with respect to the arrangement direction of the light emitting diodes.

In the lighting unit 700 constructed in this way, since the respective rows are adjacent to each other, the shadow 51 is reduced. In addition, the shadow 51 is also reduced by a step G (step in the descending direction on the side opposite to the light emitting direction) by an adjacent LED 17. That is, toward the direction of the LED 17 (the lower side of FIG. 9 ), move in parallel a boundary line (e.g., a first boundary line 45) that crosses the top corner (point 49) shown in FIG. One side, thereby reducing the substantially triangular shadow 51 sandwiched between the first and second boundary lines 45 and 47 formed on the surface of the second reflection member 27 . Therefore, the shadow 51 is further reduced in order to suppress darkening of the color of the illumination light or generation of shadows.

As shown in FIGS. 20A and 20B , the lighting unit 700 may be constituted by a lighting unit 700A in which two lighting units 700 are connected.

Fig. 20A is a plan view of a modified example in which the lighting units shown in Figs. 19A and 19B are arranged in parallel. Fig. 20B is its cross-sectional view along the line C-C. In this case, the second reflective member 27 that has been placed in the connection portion is removed, thus leaving only the second reflective member pair 27 on the outside, so as to sandwich the entire unit.

The lighting unit 700 according to this embodiment may be formed of a lighting unit 700B in which LEDs 17 are arranged in three rows, as shown in FIG. 21 .

Fig. 21a is a plan view of a lighting unit in which light emitting diodes are arranged in three rows, and Fig. 21B is a cross-sectional view thereof, along line D-D. In this case, the line L2 arranged at the center is arranged lower than the step G, and the lines L1 and L3 on both sides are arranged higher than the line L2. This configuration can also reduce the shadow 51 by the same action as above, so that the darkening of the illumination light and the generation of the shadow 51a can be suppressed. Also, the steps G of the LEDs 17 may be formed so that adjacent LED lines have different steps. Therefore, the concavo-convex shape between the rows can be formed with a concavo-convex shape so that the concave portion is inverted into the convex portion. In addition, the light emitting diode lines may be set to have the same length as the arrangement direction of the light emitting diode lines so as to form the second reflective part 27 in a substantially rectangular frame shape.

According to the structure of this embodiment, in the third and fourth embodiments, LEDs arranged in a plurality of rows can be formed in an array or in a ring, respectively. In this case, a large amount of illumination light can be obtained. Figure 22 shows another arrangement of multiple light emitting diodes. In this case, the lighting unit 700C has a plurality of first reflection members 25 arranged in a zigzag pattern within a ring-shaped second reflection member 27 . Even in this case, the LED 17 has steps between adjacent LEDs with respect to the direction of light emission. In FIG. 22, the second reflection member 27 is formed in a hexagonal frame shape. However, not limited thereto, it may be formed in any polygonal shape or circular ring shape.

So far, the present invention has been described in detail or with reference to specific embodiments. However, it is apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the present invention.

This application is based on Japanese Patent Application No. 2004-346543 filed on November 30, 2004, Japanese Patent Application No. 2005-249986 filed on August 30, 2005, and Japanese Patent Application No. 2005-257976 filed on September 6, 2005. Its contents are included by reference.

example 1

Next, the result of calculating the light performance of the lighting device in which the lighting unit according to the present invention is used will be described.

The performance of the lighting device 200 according to the first embodiment of the present invention is shown as follows:

·Number of LEDs: 16

・Overall dimensions of reflector parts

Length: 23.8mm, Width: 264mm; Height (H): 16.25mm.

According to the lighting device 200 having such a structure, the following basic characteristics are experimentally obtained:

· Straight irradiation distance (the maximum distance obtained from the position of the light source until the position where the illuminance is greater than 1lx): more than 30m

・Illuminance under the spotlight (under the spotlight, the illuminance in a position at a distance of 2m): 48.5lx/ ^m2

· Electrical properties,

When driven at 12V (common in AC/DC): 0.09A 1.1Wh each

When driven at 24V (common in AC/DC): 0.08A 1.92Wh each

·Optical properties

Total flux (when driven at 12V): 18.81m

Total flux (when driven at 24V): 42.81m.

Here, in order to check the effect of the lighting unit 100 having such a structure, a test of illuminance distribution was performed in the following conditions.

The above lighting unit was set as Example 1-1, the lighting unit including only the light emitting unit 21 having the reflector member removed from the above lighting unit was set as Comparative Example 1-1, and only the reflector as the above lighting unit was included. The lighting unit of the first reflection member 25 of the body member was set as Comparative Example 1-2. That is, three models are provided, such as an illumination section with a combination of a parabolic mirror and a flat mirror (Example 1-1), an illumination unit with only a parabolic mirror (Comparative Example 1-1), and an illumination unit without a reflector (Comparative Example 1-1). Example 1-2).

At the time of measuring illuminance, a box of 30 cm x 35 cm x height 49 cm was prepared in a dark room, and the lighting units of the above three models were arranged in the box. The illuminance in each predetermined measurement position was measured by an illuminance measuring system (manufactured by Yokogawa Instruments Corporation, model 51002).

FIG. 23 is a graph showing the measurement results of the illuminance distribution of Comparative Example 1-1. FIG. 24 shows the measurement results of the illuminance distribution of Comparative Example 1-2. FIG. 25 shows the measurement results of the illuminance distribution of Comparative Example 1-1.

In Comparative Example 1-1, where the entire wide-angle range forms an area with an illuminance of about 100 lx, even the maximum illuminance is only 115 lx, as shown in FIG. 23 .

In Comparative Example 1-2, a bright area having an illuminance of 360 to 400 lx was formed, and the irradiation range was substantially the same as the width in the opening side of the parabolic mirror, as shown in FIG. 24 .

In contrast, in Example 1-1, a dense bright area having a substantially constant illuminance exceeding 900 lx is formed in a range substantially the same as the width of the flat mirror, as shown in FIG. 25 . Outside this bright area, the illuminance is significantly reduced to about 200 lx. The dense bright area of Example 1-1 is clearly different from the bright area whose boundary is unclear in Comparative Example 1-2, meaning that the position of this bright area can be clearly identified.

Next, the effect of reducing power consumption in this lighting device is compared. Here, in the case where a conventional lighting device using a fluorescent lamp or a bulb-type fluorescent lamp is replaced by the lighting device of the present invention so that the illuminance has the same level, the difference in power consumption between both sides is compared.

[Table 1]

The power consumption of Comparative Example 2-1 was 448W, in which an inverter type chilled wire fluorescent lamp (56W x 8) was used. In order to obtain the same illuminance as in Comparative Example 2-1, a total of 70 lighting units were prepared in Example 2-1, having the same structure as that of the first embodiment in which DC 24V-driven lighting units (LED arrays) and reflectors were combined. . Since the power consumption of each lighting unit is 1.92W under the driving voltage of DC 24V, the power consumption of 70 lighting units becomes 134W. That is, when the previous lighting device with a power consumption of 448W is changed to the lighting device of the present invention, the power consumption is reduced by 134W, which is 0.3 times.

The power consumption of Comparative Example 2-2, a lighting device EG-9818 manufactured by Endo Lighting Corporation using a fluorescent lamp EFD9EL-E17 (9W x 60) manufactured by Hitachi, Ltd., was 540W. In Example 2-2, in order to obtain the same level of illuminance, a total of 132 lighting units of the first embodiment have been prepared. Since the power consumption of each lighting is 1.92W under the driving voltage of DC 24V, the power consumption of 132 lighting units becomes 253W. That is, the power consumption in this case is reduced by 0.47 times.

The power consumption of Comparative Example 3-3, lighting equipment EG-9818 manufactured by Endo Lighting Corporation using fluorescent lamp EFD9EL-E17 (9W x 36) manufactured by Hitachi, Ltd., was 324W. In Examples 2-3, a total of 86 lighting units of the first embodiment have been prepared in order to obtain the same level of illuminance. Since the power consumption of each lighting is 1.1W under the driving voltage of DC12V, the power consumption of 86 lighting units is 4.6W. That is, the power consumption in this case is reduced by 0.29 times.

Next, tests of illuminance performance and light distribution performance were performed in the following conditions in order to check the effects of the lighting units 100 and 300 having such a structure.

In the structure of the above embodiment, the lighting unit 100 whose reflection surface is formed by a mirror surface is set as Example 3-1, and in the structure of the above embodiment, the lighting unit 300 whose reflection surface is formed by a smooth-processed glossy surface The lighting unit 300 which was set as Example 3-2, and the reflective surface whose reflective surface was formed of a smooth-processed matte surface was set as Example 3-3. A lighting unit having only the LED 17 in which the first and second reflection members 25 and 27 were not provided was set as Comparative Example 3-1.

The properties of the lighting units used in the examples and comparative examples are as follows:

·Number of LEDs: 16

The overall dimension length of the reflector member 23:

Length: 23.8mm, Width: 264mm; Height (H): 16.25mm

The smooth-finished glossy reflective surface of Example 3-2 and the smooth-finished matte reflective surface of Example 3-3 were formed by using different primer liquids in the electroplating process. That is, as the undercoat liquid of Example 3-2, "K173NP undercoat" manufactured by Toyo Kogyo Toryo Co. Ltd. was used. As the undercoat liquid of Example 3-3, "500mat28" manufactured by Hisho K.K. was used.

A glossy or matte surface quality on a reflective surface can be specified as roughness by using a large amount of sandpaper. That is, the number N ₁ of sandpapers corresponding to the surface properties of Example 3-2 is #70 ≤ _{N 1} ≤ #100, preferably, #_80 ≤ _{N 1} ≤ #90. In addition, the number N ₂ of sandpaper corresponding to the surface properties of Example 3-3 is # _60≤N2≤ #100, preferably, # _75≤N2≤ #85.

Fig. 26 shows a graph of the lighting performance of Example 3-1. Fig. 27 is a graph showing the light distribution performance of Example 3-1. Fig. 28 shows a graph of the illuminance performance of Example 3-2. Fig. 29 is a graph showing the light distribution performance of Example 3-2. Fig. 30 shows a graph of the illuminance performance of Example 3-3. Fig. 31 shows a graph of the light distribution performance of Example 3-3. Fig. 32 is a graph showing the lighting performance of Comparative Example 3-1. FIG. 33 is a graph showing the light distribution performance of Comparative Example 3-1. In each of the graphs of FIGS. 27 , 29 , 31 and 33 , the angle of the horizontal axis represents the angle when the measuring instrument is rotated 90° symmetrically with the central axis of the light emitting surface of the lighting unit 100 as the rotation axis. Also, a solid line in each graph represents a measurement result when an axis parallel to the longitudinal direction of the lighting unit 300 is set as the rotation axis, and a dotted line represents a measurement result when an axis perpendicular to the rotation axis is set as the rotation axis.

Table 2 shows the surface properties, power supply, total flux, efficiency, maximum light intensity, 1/2 beam angle and evaluation of Examples 3-1, 3-2 and 3-3 and Comparative Example 3-1.

[Table 2]

surface properties Input voltage [v] Input current [mA] Input power [w] Total flux [lm] Efficiency [lm/w] Maximum luminous intensity [cd] 1/2 beam angle [deg] evaluate Example 3-1 mirror 12.01 89.09 1.07 42.7 34.1 96.5 11.5 O (dark color, shadow) Example 3-2 smooth finish glossy 12.01 88.78 1.07 36.4 34.1 96.5 25 o Example 3-3 smooth finish matte 12.01 88.57 1.06 38.7 36.4 53.0 44 o Comparative example 3-1 module only 11.99 88.19 1.06 43.3 41.0 14.7 11.5 X (insufficient illumination)

In Example 3-1, at an irradiation distance of 2 m, an irradiation area with an illuminance of 50 lx is formed by a horizontal distance of about 0.4 mm, as shown in FIG. 26 . Furthermore, as shown in FIG. 27 , a light intensity of 50 to about 400 cd was obtained at a light distribution angle of -10° to 10°. In a position where the irradiation distance is close, color separation (darkening of color) or shadows divided into yellow light components and blue light components are recognized. However, as the illumination distance increases, the colors darken and the shadows disappear.

In Example 3-2, in an irradiation distance of 2 m, an irradiation area with an illuminance of 10 lx is formed by a horizontal distance of about 0.8 mm, as shown in FIG. 28 . Furthermore, as shown in FIG. 29 , at a light distribution angle of −30° to 30°, a uniform light intensity of 20 to about 50 cd was obtained. The separation of light into yellow and blue light is not recognized.

In Example 3-3, in an irradiation distance of 2 m, an irradiation area with an illuminance of 10 lx is formed by a horizontal distance of about 0.8 mm, as shown in FIG. 30 . In this area, an irradiation area with an illumination of 20 lx is formed by a horizontal distance of about 0.4 mm. Furthermore, as shown in FIG. 31 , at a light distribution angle of -30° to 30°, a light intensity of 20 to about 100 cd was obtained. The separation of light into yellow and blue light is not recognized.

In Comparative Example 3-1, as shown in FIG. 32 , in an irradiation distance of 1.6 m, an irradiation area with an illuminance of 5 lx was formed by a horizontal distance of about 0.8 mm, meaning that sufficient illuminance was not ensured. However, as shown in FIG. 33, a region is formed that smoothly changes the light intensity from 0 to about 15 cd at the light distribution angle of -90° to 90°. Color separations that change to yellow and blue are not recognized.

In Example 3-2, wherein the reflective surface is formed of a smooth-processed glossy surface, and in Example 3-3, wherein the reflective surface is formed of a smooth-processed matte surface, the light of the LED can be focused with high efficiency, And there is no color dulling or shadowing. Furthermore, in each of the Examples, in which the height of the second reflective surface falls within a limited range, uniform illumination can be reliably obtained as compared with Comparative Examples 1-1, 1-2, and 3-1 in which no second reflective surface is provided. degree distribution.

Industrial Applicability

According to the invention, an illumination area with a constant flat illuminance distribution is obtained under high illuminance while saving electric power. Furthermore, the present invention can be suitably applied to lighting that can extend the irradiation distance of light.

Claims (11)

1. lighting unit that has as the light emitting diode of light source, this lighting unit comprises:

The luminescence unit of a plurality of light emitting diodes that have pedestal and on this pedestal, arrange;

Corresponding to a plurality of first reflection parts that each a plurality of light emitting diodes on the emission side of luminescence unit are provided with, each first reflection part has parabolic surface, and its focal position is the light-emitting area of this light emitting diode; And

Be parallel to a pair of second reflection part that the arranged direction of the light emitting diode on the light emission side of first reflection part that passes light emitting diode is arranged, each second reflection part has the reflecting surface of plate shape, the light of the diode of self-luminous in the future is towards the direction reflection of emission side

The reflecting surface of wherein said plate shape is shared by the light emitting diode institute more than.

2. according to the lighting unit of claim 1, wherein, when from the emission of first reflection part be set as first boundary line from the luminous flux of light emitting diode and the boundary line between its shade on second reflection part time,

Wherein, when being set as second boundary line from the luminous flux of another light emitting diode that is adjacent to this light emitting diode and the boundary line between its shade on second reflection part, second reflection part protrudes into height in the emission side and is set as the point that is higher than on second reflection part that first and second boundary lines wherein intersect for the first time.

3. lighting unit that has as the light emitting diode of light source, this lighting unit comprises:

The luminescence unit of a plurality of light emitting diodes that have pedestal and on this pedestal, arrange;

Corresponding to first reflection part that each a plurality of light emitting diodes on the light emission side of luminescence unit are provided with, each first reflection part has parabolic surface, and its focal position is the light-emitting area of light emitting diode; And

On the emission side of first reflection part, have second reflection part of plate shape reflecting surface, the light of this plate shape reflecting surface self-luminous in the future diode reflects towards the direction of emission side,

Wherein, be set as first boundary line when what launch from the luminous flux of light emitting diode and the boundary line between its shade on second reflection part from first reflection part, when being set as second boundary line from the luminous flux of another light emitting diode that is adjacent to this light emitting diode and the boundary line between its shade on second reflection part, second reflection part protrudes into height in the emission side and is set as the point that is higher than on second reflection part that first and second boundary lines wherein intersect for the first time.

4. according to the lighting unit of claim 3, wherein, arrange a plurality of light emitting diodes with multirow, and in two outsides of the arranged direction of a plurality of light emitting diode lines, the arranged direction that is parallel to the light emitting diode in the light emitting diode lines arranges that second reflection part is right.

5. according to the lighting unit of claim 4, wherein, between light emitting diode lines and another light emitting diode lines of being adjacent, in light emission direction, the light emitting diode between each row has step.

6. according to the lighting unit of claim 4, wherein, with zigzag graphical layout light emitting diode lines, wherein the arrangement pitch of each row is changed 1/2 arrangement pitches into first reflection part in the line direction.

7. according to the lighting unit of claim 6, wherein, between light emitting diode lines and another light emitting diode lines of being adjacent, in light emission direction, the light emitting diode between each row has step.

8. according to the lighting unit of claim 1, wherein, the reflecting surface of first and second reflection parts is formed by the minute surface by evaporation coating.

9. according to the lighting unit of claim 1, wherein, at least one reflecting surface of first and second reflection parts is by smooth processing.

10. according to the lighting unit of claim 1, wherein, light emitting diode is to have blue light-emitting diode and will change the white light emitting diode of the fluorescent material of gold-tinted component from the blue light components of blue light-emitting diode into.

11. a lighting apparatus comprises:

Lighting unit according to claim 1; And

Be provided for driving the driver element of the electrical power of lumination of light emitting diode.

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