TW201932791A - Light source device and distance measuring sensor provided with same - Google Patents

Abstract

A light source device (10) is provided with: a light source unit (11) that outputs laser light; a condenser lens (12); and a translucent fluorescent body (13). The condenser lens (12) collects the laser light outputted from the light source unit (11). The translucent fluorescent body (13) outputs fluorescence when irradiated with the laser light thus collected by the condenser lens (12).

Description

Light source device and distance measuring sensor provided therewith

The present invention relates to a light source device and a distance measuring sensor provided therewith.

In recent years, a light source device that combines a light source portion that emits blue laser light and a phosphor that is excited by blue laser light and emits fluorescence is used.
For example, Patent Document 1 discloses a light source device that emits laser light emitted from a plurality of semiconductor lasers and condensed by a condensing lens to emit wavelengths in order to achieve miniaturization and high luminance of the light source device. The plurality of phosphors of the same fluorescent light are configured such that the light-emitting points of the respective semiconductor lasers and the respective phosphors are conjugated to each other via the collecting lens.
[Prior Art Literature]
[Patent Literature]
[Patent Document 1] Japanese Patent Laid-Open Publication No. 2013-120735
[Patent Document 2] Japanese Patent No. 5649202
[Patent Document 3] Japanese Patent Laid-Open Publication No. 2007-148418

However, the prior light source device has problems as shown below.
In other words, in the light source device disclosed in the publication, the phosphor is formed by being mixed into a binder such as a resin. Therefore, when the laser light emitted from the semiconductor laser is irradiated to the phosphor, the laser light is irradiated onto the phosphor. Scattering occurs inside. Therefore, when the fluorescence is emitted in a specific direction, the fluorescence emitted from the phosphor cannot be efficiently derived, and it is difficult to obtain a light source having a sufficiently high luminance.
Further, in Patent Document 2, a light source device using a single crystal phosphor having no binder such as a resin is described. However, when only a single-crystal phosphor is irradiated with laser light, it is difficult to obtain a light source that is sufficiently brightened.
An object of the present invention is to provide a light source device that can obtain a light source having a higher brightness than before, and a distance measuring sensor including the same.
[Means for solving the problem]
The light source device according to the first aspect of the invention includes a light source unit that emits laser light, a collecting lens, and a light transmitting phosphor. The condensing lens condenses the laser light irradiated from the light source unit. The translucent phosphor is irradiated with laser light collected by a collecting lens to emit fluorescence.
Here, the light-transmitting phosphor is irradiated with laser light that is irradiated from the light source unit and collected by the collecting lens, and the fluorescent light excited by the laser light in the light-transmitting phosphor is used as the light source.
Here, as the light source unit, for example, a semiconductor laser (Laser Diode (LD)) that emits blue laser light or the like can be used.
The condensing lens is not particularly limited as long as it has a function of collecting laser light to the light-transmitting phosphor. Further, it is preferable that the condensing lens is disposed such that the condensing point is provided on the surface or inside of the light-transmitting phosphor.
The light-transmitting phosphor is, for example, a block-shaped phosphor such as a polyhedron or a spherical shape, and includes a single crystal phosphor, a translucent ceramic phosphor, and the like. Further, the light transmissivity is such that there is almost no scattering of light inside the phosphor irradiated by the laser light (including the characteristic of no scattering), and it means that a light collecting point is formed inside the phosphor ( Scattering characteristics of the extent of the spot).
Thereby, a portion of the light-transmitting phosphor that is irradiated with the laser light collected by the collecting lens forms a fluorescent light source portion that emits fluorescence excited by the laser light in the direction in which the laser light propagates, and By the characteristics of the light-transmitting phosphor, the emitted fluorescent light can be derived without scattering the laser light.
As a result, the fluorescent light emitted from the fluorescent light source unit formed of the light-transmitting phosphor can be efficiently derived, so that a light source having a higher brightness than the previous one can be obtained.
In the light source device according to the first aspect of the invention, the light-transmitting phosphor has a fluorescent light source unit, and the fluorescent light source unit is formed in a portion where the laser beam is collected by the collecting lens. .
Here, for example, in a bulk translucent phosphor having a rectangular parallelepiped shape, a fluorescent light source portion that is excited by laser light and emits fluorescence is formed in a portion where the laser light is collected.
Here, the fluorescent light source unit is formed along a direction in which the laser light in the light-transmitting phosphor propagates, and emits light in a portion irradiated with the laser light.
Thereby, since the laser light is irradiated to the light-transmitting phosphor with little scattering, the power of the fluorescent light generated per unit volume of the fluorescent light source unit can be increased. Thereby a light source with a higher brightness than before can be obtained.
In the light source device according to the second aspect of the invention, the fluorescent light source unit has a long substantially cylindrical shape in a propagation direction of the laser light irradiated from the light source unit.
Here, the fluorescent light source portion formed in the irradiation portion of the laser light in the inside of the light-transmitting phosphor is formed in a substantially cylindrical shape formed along the propagation direction of the laser light.
Thereby, the fluorescent light can be emitted from the substantially cylindrical fluorescent light source unit formed inside the light-transmitting phosphor.
In the light source device according to any one of the first to third aspects of the invention, the laser light is collected by the condensing lens to the surface or inside of the light-transmitting phosphor.
Here, the laser light is condensed to the surface or inside of the light-transmitting phosphor.
Thereby, in the translucent phosphor, a fluorescent light source portion that is excited to emit fluorescence is formed in a portion where the laser light is collected. Further, since the laser light is hardly scattered from the surface to the inside of the light-transmitting phosphor, the emitted fluorescent light can be efficiently derived from a desired direction.
In the light source device according to any one of the first to fourth aspects of the invention, the light source device of the present invention further includes the introduction lens, and the introduction lens performs the fluorescence emitted from the translucent phosphor. Spotlight.
Here, an introduction lens that guides fluorescence emitted from a portion (fluorescent light source unit) irradiated by the laser light in the inside of the light-transmitting phosphor is provided.
Thereby, the fluorescence emitted from the light-transmitting phosphor is led out to the outside from the direction of the introduction lens in the light-transmitting phosphor.
Thereby, a light source higher than the previous brightness can be obtained.
In the light source device according to the fifth aspect of the invention, the introduction lens is configured such that the lens central axis and the central axis of the laser light propagating through the light-transmitting fluorescent body are aligned.
Here, the introduction lens is disposed such that the central axis of the lens and the light-emitting portion (fluorescent light source portion) formed in the direction in which the laser light propagates in the inside of the light-transmitting phosphor are propagated by laser light. The center axis is consistent.
With this configuration, the central axis of the introduction lens is aligned with the central axis of the fluorescent light-emitting portion (fluorescent light source portion) formed inside the light-transmitting phosphor, so that the light-transmitting fluorescent can be efficiently derived. Fluorescence emitted in the light body. Thereby, a light source higher than the previous brightness can be obtained.
In addition, since the central axis of the introduction lens is arranged in alignment with the central axis of the fluorescent light-emitting portion (fluorescent light source unit) formed inside the light-transmitting phosphor, the downstream side of the light source unit can be disposed. The optical system (concentrating lens, introduction lens) is placed on a straight line. Thereby, the optical axis adjustment can be easily performed, and the optical system can be miniaturized.
According to a light source device of a fifth aspect of the invention, in the light source device of the fifth aspect of the invention, the optical fiber device further includes an optical fiber, wherein the optical fiber is irradiated with the fluorescent light collected by the introduction lens at the first end surface, and The second end surface on the opposite side of the end surface emits fluorescence.
Here, on the downstream side of the lens for introducing the fluorescent light emitted from the inside of the light-transmitting phosphor, the opposite side to the incident side (first end face) of the fluorescent light incident from the introduction lens is disposed. 2 end face) fiber that exits.
Thereby, the light in the depth of field of the fluorescent light source unit can be introduced into the optical fiber. Therefore, the fluorescent light can be introduced from the first end surface of the optical fiber, and the high-intensity light can be emitted from the second end surface.
In addition, the depth of field generally means a range in which the amount of blurring is allowed with respect to the image plane of the lens, and the front and back of the in-focus position on the object surface side are regarded as a range in which the focus is practically focused. In the present invention, when the core diameter in the end surface of the optical fiber is the diameter of the perforated aperture in the image plane of the lens, the depth of field formed on the object surface is formed by the introduction lens.
Here, the end face of the optical fiber refers to a cross section in the end portion of the optical fiber into which the light collected by the introduction lens is incident. In addition, the core diameter refers to the inner diameter of a cylindrical core portion that transmits light in the optical fiber.
The light source device according to any one of the first to seventh aspects of the invention, wherein the light-transmitting phosphor is in an incident surface on which the laser light is incident and an exit surface on which the fluorescent light is emitted. At least one of them has a convex curved surface.
Here, at least one side of the side on which the laser light is incident on the light-transmitting phosphor and the side on which the light is emitted is a convex curved surface.
In this case, when the convex curved surface is provided on the incident side, for example, the size of the concave mirror or the like provided between the condensing lens and the light-transmitting phosphor can be reduced in size in the radial direction.
On the other hand, when the convex curved surface is provided on the emission side, the divergence of light due to the refraction at the interface between the translucent phosphor and the air can be suppressed, and for example, the introduction can be performed on the downstream side. The diameter of the lens is miniaturized.
Further, when the convex curved surface is provided on both sides of the incident side and the outgoing side, both the effect on the incident side and the effect on the exit side can be obtained.
The light source device according to any one of the first to eighth aspects of the invention, wherein the light-transmitting phosphor is a single crystal phosphor.
Here, a single crystal phosphor is used as the translucent phosphor.
As a result, the laser light collected by the collecting lens is less likely to propagate in the inside of the phosphor than the phosphor including the binder such as a resin, so that the fluorescent light can be efficiently emitted. Thereby, a light source higher than the previous brightness can be obtained.
In the light source device according to any one of the first to ninth aspects of the invention, the light source device further includes a concave mirror disposed on the incident surface side of the light-transmitting phosphor to illuminate the light source portion The laser light transmitted through the light-transmitting phosphor and reflected on the incident surface side is reflected toward the light-transmitting phosphor side.
Here, a concave mirror that transmits the laser light and reflects the fluorescent light is disposed on the incident surface side of the light-transmitting phosphor, that is, between the condensing lens and the light-transmitting phosphor.
Here, a dichroic mirror or a perforated mirror having an opening through which laser light passes may be used in the concave mirror.
Thereby, the laser light collected by the condensing lens can be transmitted to the light-transmitting phosphor, and the light emitted from the light-transmitting phosphor can be radiated to the light-transmitting property by the concave mirror. The fluorescent light on the incident surface side of the phosphor is reflected in the direction of the fluorescent light emission position.
As a result, the fluorescent light emitted from the light-transmitting phosphor can be efficiently extracted by the concave mirror, and thus a light source which is further brightened can be obtained.
In the light source device according to any one of the first to ninth aspects of the invention, the light source device further includes a concave mirror that is disposed on the emission surface side of the light-transmitting phosphor and that is irradiated from the light source unit Further, the laser light emitted from the translucent phosphor is reflected by the laser light emitted from the translucent phosphor, and the fluorescent light emitted to the exit surface side is transmitted.
Here, a concave mirror that reflects the laser light and transmits the fluorescent light is disposed on the emission surface side of the light-transmitting phosphor.
Here, a dichroic mirror or a perforated mirror having an opening through which the fluorescent light passes may be used in the concave mirror.
Thereby, the fluorescent light emitted from the light-transmitting phosphor can be transmitted, and the laser light collected by the collecting lens and transmitted through the light-transmitting fluorescent body can be reflected by the concave mirror in the direction of the fluorescent light-emitting position.
As a result, the laser light transmitted through the light-transmitting phosphor is again reflected toward the light-transmitting phosphor by the concave mirror, whereby the fluorescent light can be efficiently extracted, and thus a light source which is further brightened can be obtained. .
A light source device according to a tenth aspect of the invention, wherein the concave mirror has a spherical surface or an aspherical curved surface centering on a light collecting point of the laser light collected by the collecting lens.
Here, the concave curved surface of the concave mirror is formed so as to be a spherical surface or an aspherical surface centering on the condensed point of the laser light collected by the condensing lens.
With this configuration, a concave curved surface can be arranged with the fluorescent light emitting portion (fluorescent light source portion) excited by the laser light condensed into the light-transmitting phosphor as a center, so that fluorescent or thunder can be used. The light emission efficiency is reflected to the side of the light emission position of the fluorescent light.
The light source device according to any one of the tenth to twelfth aspects, wherein the concave mirror is a dichroic mirror.
In the concave mirror provided on the incident surface side of the laser light provided in the light-transmitting phosphor, the laser light can be transmitted, and the light-emitting phosphor can be emitted and emitted to the incident surface side. The light is reflected toward the light-emitting position in the light-transmitting phosphor.
Alternatively, in the concave mirror provided on the exit surface side of the light-transmitting phosphor, the fluorescent light emitted from the light-transmitting phosphor can be transmitted, and the laser light transmitted through the light-transmitting phosphor can be directed toward The light-emitting position direction of the light-transmitting phosphor is reflected.
As a result, a light source that is further brightened can be obtained.
The distance measuring sensor according to a fourteenth aspect of the invention, comprising the light source device, the light receiving unit, and the measuring unit. The light receiving unit receives the reflected light of the light irradiated from the light source device. The measuring unit measures the distance from the object based on the amount of light received by the light receiving unit.
Here, the distance sensor is constructed using the light source device.
Thereby, a light source which is higher in brightness than before can be used, and therefore an effect of improving measurement accuracy and improving response speed can be obtained.
The ranging sensor of the 15th invention is the distance measuring sensor of the 14th invention, wherein the light source device emits fluorescence including a plurality of wavelengths, and the distance measuring sensor further has a fluorescent light to thereby pass The way the chromatic aberration focus lens is constructed. The light receiving unit receives the reflected light of the fluorescent light that is irradiated onto the object via the chromatic aberration focus lens. The measuring unit measures the distance from the object based on the wavelength of the fluorescent light whose maximum light receiving amount in the light receiving unit is the maximum.
Here, a confocal type ranging sensor is constructed in which a chromatic aberration focus lens is used to separate fluorescence according to a wavelength (by color), and a peak of light of each wavelength is detected, thereby measuring The distance from the object.
Thereby, as described above, the distance measuring sensor is constructed using a light source device that illuminates the fluorescent light that has been previously brightened, so that a high-performance confocal type ranging sensor can be obtained.
[Effects of the Invention]
According to the light source device of the present invention, a light source having a higher brightness than the previous one can be obtained.

(Embodiment 1)
A light source device 10 according to an embodiment of the present invention and a confocal measurement device (ranging sensor) 50 including the light source device 10 will be described below with reference to FIGS. 1 to 4 .
(Co-focus measuring device 50)
As shown in FIG. 1 , the confocal measurement device 50 on which the light source device 10 of the present embodiment is mounted is a measurement device that measures the displacement of the measurement target T by the confocal optical system. For example, a cell gap or the like of the liquid crystal display panel exists in the measurement target T measured by the confocal measurement device 50.
As shown in FIG. 1, the confocal measurement device 50 includes a head portion 51 having an optical system of a confocal point, a controller unit 53 optically connected via an optical fiber 52, and a monitor 54 displaying the output from the controller unit 53. Signal.
The head portion 51 has a diffraction lens (chromatic aberration focus lens) 51a in the cylindrical frame portion, an objective lens 51b disposed on the measurement object T side of the diffraction lens 51a, and an optical fiber 52 and a diffraction lens. Condenser lens 51c between 51a.
The diffractive lens 51a generates chromatic aberration in the optical axis direction from light emitted from a light source (for example, a white light source) that emits light of a plurality of wavelengths, which will be described later. The diffraction lens 51a is periodically formed with a fine undulating shape such as a Kinoform shape or a binary shape (step shape, step shape) on the surface of the lens. Further, the shape of the diffractive lens 51a is not limited to the above configuration.
The objective lens 51b condenses light having chromatic aberration generated in the diffraction lens 51a to the measurement object T.
The condenser lens 51c is disposed between the optical fiber 52 and the diffractive lens 51a such that the numerical aperture of the optical fiber 52 coincides with the numerical aperture of the diffractive lens 51a.
The reason for this is that light emitted from the white light source is guided to the head portion 51 via the optical fiber 52, and in order to effectively utilize the light emitted from the optical fiber 52 by the diffraction lens 51a, it is necessary to make the numerical aperture of the optical fiber 52 (NA: numerical) The aperture) coincides with the numerical aperture of the diffractive lens 51a.
The optical fiber 52 is an optical path from the head 51 to the controller portion 53, and also functions as a pinhole. In other words, among the light collected by the objective lens 51b, the light focused at the measuring object T is focused at the opening of the optical fiber 52. Therefore, the optical fiber 52 functions as a pinhole that blocks light that is not focused at the measurement target T and that passes light that is focused at the measurement object T.
The confocal measurement device 50 may be configured such that the optical fiber 52 is not used in the optical path from the head 51 to the controller portion 53. However, since the optical fiber 52 is used in the optical path, the head portion 51 can be made relative to the controller portion 53. Flexible to move. In addition, when the configuration in which the optical fiber 52 is not used in the optical path from the head 51 to the controller unit 53 is required, the confocal measurement device 50 needs to have a pinhole. However, in the case where the optical fiber 52 is used, the confocal point is used. The measuring device 50 does not need to have a pinhole.
The controller unit 53 is internally provided with a light source device 10 as a white light source, a branch fiber 56, a beam splitter 57, an imaging element (light receiving unit) 58, and a control circuit unit (measurement unit) 59. Furthermore, the detailed configuration of the light source device 10 will be described in detail in the following paragraphs.
The branch fiber 56 has one optical fiber 55a on the side of connection with the optical fiber 52 formed from the head 51 to the optical path of the controller portion 53, and has two optical fibers 15 and 55b on the opposite side of the connection side. Furthermore, the optical fiber 15 constitutes a part of the light source device 10 to be described later. The optical fiber 55b is connected to the spectroscope 57 to introduce light collected by the spectroscope 57 from the end surface.
Therefore, the branch fiber 56 guides the light emitted from the light source device 10 to the optical fiber 52, and irradiates the measurement object T from the head 51. Further, the branch fiber 56 guides the light reflected by the surface of the measuring object T to the spectroscope 57 via the optical fiber 52 and the head portion 51.
The spectroscope 57 has a concave mirror 57a for reflecting reflected light returned via the head 51, a diffraction grating 57b for incident light reflected by the concave mirror 57a, and a collecting lens 57c for self-diffusing grating The light emitted by 57b is concentrated. Further, the spectroscope 57 can be any combination of the Czerny-Turner type and the Littrow type, as long as the reflected light returned through the head 51 can be distinguished according to the wavelength. .
The imaging element 58 is a line complementary metal oxide semiconductor (CMOS) or a charge coupled device (CCD) that measures the intensity of light emitted from the spectroscope 57. Here, in the confocal measurement device 50, the spectroscope 57 and the imaging element 58 constitute a measurement unit that measures the intensity of the reflected light returned via the head 51 in accordance with the wavelength.
In addition, the measurement unit may be configured to measure the intensity of light returned from the head portion 51 in accordance with the wavelength, and may be configured by a single element of the imaging element 58 such as a CCD. In addition, the imaging element 58 may be a two-dimensional CMOS or a two-dimensional CCD.
The control circuit unit 59 controls the operation of the light source device 10 or the image sensor 58. Further, although not shown, the control circuit unit 59 has an input interface, an output interface, and the like, and the input interface inputs a signal for adjusting the operation of the light source device 10 or the imaging device 58 and the like, and the output interface outputs the imaging element. 58 signal.
The monitor 54 displays the signal output from the imaging element 58. For example, the monitor 54 traces the spectral waveform of the light returned from the head 51 and displays the displacement of the measurement object.
In the confocal measurement device 50 of the present embodiment, a light source having high luminance can be obtained by mounting the following light source device 10.
As a result, as the measuring device, it is possible to obtain an effect that the measurement distance can be extended and the responsiveness can be improved.
The configuration of the light source device 10 will be described in detail below.
(Light source device 10)
The light source device 10 of the present embodiment is mounted as a light source of the confocal measurement device 50, and includes a light source unit 11, a condensing lens 12, a translucent phosphor 13, an introduction lens 14, and Optical fiber 15.
The light source unit 11 is, for example, a semiconductor laser that emits laser light having a peak wavelength of about 450 nm, and irradiates the laser light in the direction of the condensing lens 12 as excitation light for emitting fluorescence in the light-transmitting phosphor 13 . .
The condensing lens 12 is a lens in which both the incident surface and the exit surface are convex, and condenses the laser light irradiated from the light source unit into the inside of the light-transmitting phosphor 13 .
The light-transmitting phosphor 13 is, for example, a single crystal phosphor of yttrium aluminum garnet (YAG) doped with Ce ions, and has an incident surface 13a disposed along a plane perpendicular to the laser propagation direction. And an exit surface 13b. Further, the translucent phosphor 13 emits fluorescence having a wavelength in the range of 480 nm to 750 nm in a portion irradiated with the laser beam condensed by the condensing lens 12 from the light source unit 11.
Further, as shown in FIG. 3, in the translucent phosphor 13, a long substantially cylindrical fluorescent light source unit 20 is formed along the propagation direction of the laser light in a portion irradiated with the laser light.
The fluorescent light source unit 20 is formed in a portion where the laser light passes through the inside of the translucent phosphor 13, and has a long substantially cylindrical shape in the laser propagation direction as shown in FIGS. 3 and 4 .
Further, since the fluorescent light source unit 20 emits fluorescence toward all directions in each portion, it can be regarded as a light source formed inside the light-transmitting phosphor 13. Specifically, as shown in FIG. 4, the fluorescent light source unit 20 has a reduced diameter portion in which the radius of the cross-sectional circle becomes smaller at the central portion in the longitudinal direction along the propagation direction of the laser light, and has a profile toward both ends. A substantially cylindrical shape in which the radius of the circle becomes large.
In other words, the fluorescent light source unit 20 is formed such that the light collecting point of the laser light is located on the reduced diameter portion cross section 20b. Further, the fluorescent light source unit 20 is formed such that the cross-sectional area of the incident side cross section 20a and the exit side cross section 20c becomes larger than the diameter reducing portion cross section 20b in accordance with the convergence and diffusion of the laser light.
For example, the end face of the fluorescent light source unit 20 on the incident side of the laser light (incidence side cross section 20a), the reduced diameter portion of the substantially cylindrical central portion (the reduced diameter portion cross section 20b), and the end surface of the exit side of the laser light (the outgoing side) In section 20c), fluorescence is emitted toward all directions.
In the fluorescent light emitted from the fluorescent light source unit 20, the fluorescent light emitted in the depth of field is introduced by the introduction lens 14 and condensed to the end surface (first surface) of the optical fiber 15.
In addition, the depth of field generally refers to a range of blurring that can be tolerated with respect to the image plane of the lens, and the front and back of the in-focus position on the object surface side are practically focused. In the present embodiment, when the core diameter in the end surface of the optical fiber 15 is the diameter of the perforated aperture in the image plane of the lens, the depth of field of the object surface is formed by the introduction lens 14.
Here, the end surface of the optical fiber 15 is a cross section in the end portion of the optical fiber 15 into which the light collected by the introduction lens 14 is incident. In addition, the core diameter means an inner diameter of a cylindrical core portion that transmits light in the optical fiber 15.
In the same manner as the condensing lens 12, the introduction lens 14 is a lens having a convex surface on both the incident surface and the emission surface, and is disposed on the downstream side of the laser light propagation direction in the light-transmitting phosphor 13 . Further, the introduction lens 14 condenses the fluorescence emitted from the inside of the translucent phosphor 13 (the fluorescent light source unit 20) to the end surface of the optical fiber 15.
In addition, as shown in FIG. 3, the introduction lens 14 is disposed such that the central axis A1 of the laser light in the inside of the translucent phosphor 13 is coaxial (on the same straight line) with respect to the lens central axis A2. In this manner, by arranging the central axis A1 of the laser beam and the lens central axis A2 of the introduction lens 14 so as to be coaxial with each other, the fluorescent light emitted from the fluorescent light source unit 20 can be efficiently transmitted from the first surface 15a. The fiber 15 is incident inside.
The optical fiber 15 is an optical fiber constituting the branch fiber 56 of the confocal measurement device 50, and internally forms an optical path of light irradiated from the head 51 of the confocal measurement device 50.
In addition, as shown in FIG. 3, the optical fiber 15 has an end surface (first surface 15a) on which the fluorescent light collected by the introduction lens 14 is incident, and an end surface (second surface 15b) on the emission side opposite to the end surface.
Thereby, the optical fiber 15 can emit light incident from the first surface 15a from the second surface 15b.
In the light source device 10 of the present embodiment, as described above, as shown in FIG. 2, the excitation laser light irradiated from the light source unit 11 is condensed by the condensing lens 12 to the light-transmitting fluorescing light. The inside of the light body 13. Further, as shown in FIG. 3, the fluorescent light generated by the condensing portion of the laser light in the inside of the light-transmitting phosphor 13 is condensed to the first surface 15a of the optical fiber 15 by the introduction lens 14.
Here, in the light source device 10 of the present embodiment, the inside of the single crystal phosphor (translucent phosphor 13) is irradiated with the laser light collected by the collecting lens 12 as described above.
At this time, when the laser beam is incident on the single-crystal phosphor (translucent phosphor 13), the inside of the phosphor is transmitted while the light is excited without being diffused in the phosphor.
In other words, in the light source device 10 of the present embodiment, a single crystal phosphor (translucent phosphor) that hardly scatters laser light incident inside is used. Therefore, compared with the conventional phosphor which is reinforced by using a binder such as a resin, the fluorescent light emitted by the laser light incident inside can be efficiently derived, and therefore, a light source having a higher brightness than the previous one can be obtained.
(Embodiment 2)
The light source device according to Embodiment 2 of the present invention will be described below with reference to Figs. 5 to 7 .
The light source device 110 of the present embodiment is different from the above-described first embodiment in that a concave mirror 116 is provided between the collecting lens 12 and the translucent phosphor 13 as shown in FIG.
The other configuration of the light source device 110 is the same as that of the light source device 10 of the first embodiment, and therefore the same reference numerals will be given thereto, and detailed description thereof will be omitted.
As shown in FIG. 5, the light source device 110 of the present embodiment includes a light source unit 11, a condensing lens 12, a concave mirror 116, a translucent phosphor 13, an introduction lens 14, and an optical fiber 15.
The concave mirror 116 is disposed between the condensing lens 12 and the translucent phosphor 13 and has a concave reflecting surface on the surface on the side of the translucent phosphor 13 . Further, the concave mirror 116 has a characteristic of transmitting the laser light collected by the collecting lens 12 and reflecting the fluorescent light emitted from the inside of the light-transmitting fluorescent body 13.
Thereby, the laser beam irradiated from the light source unit 11 and condensed by the condensing lens 12 can be irradiated to the translucent phosphor 13 without being blocked by the concave mirror 116. Further, as shown in FIG. 6, the fluorescent light source unit 120 formed inside the light-transmitting phosphor 13 is radiated to the condensing lens 12 side by the fluorescent light emitted from all the directions. The fluorescent reflection is returned to the side of the light-transmitting phosphor 13 .
As a result, in the introduction lens 14, more fluorescence than the fluorescence introduced in the first embodiment can be introduced and collected on the first surface 15a of the optical fiber 15, so that further high brightness can be obtained. Light source.
Further, the concave mirror 116 is disposed such that the center of the concave curved surface appears on the central axis A1 of the fluorescent light source unit 120.
Thereby, the reflected fluorescent light can be condensed at the position of the portion (fluorescent light source portion 120) that emits fluorescence.
As a result, in the introduction lens 14, more fluorescence than the fluorescence introduced in the first embodiment can be introduced and collected on the first surface 15a of the optical fiber 15, so that higher brightness can be obtained more effectively. Light source.
Further, the concave mirror 116 preferably has a spherical or aspherical shape centering on a light collecting point of the laser light collected by the collecting lens 12 into the light transmitting fluorescent body 13.
Thereby, the reflected fluorescent light can be collected by the fluorescent portion (fluorescent light source unit 120).
As a result, in the introduction lens 14, more fluorescence than the fluorescence introduced in the first embodiment can be introduced and collected on the first surface 15a of the optical fiber 15, so that higher brightness can be obtained more effectively. Light source.
Further, as the concave mirror 116, a dichroic mirror or a lens in which a reflective film that reflects fluorescence is vapor-deposited on a concave surface of a meniscus lens may be used, and an opening may be formed in a portion through which the laser light passes. A perforated mirror that reflects fluorescence in the surface of the shape.
For example, in the case where a dichroic mirror is used as the concave mirror 116, as shown in FIG. 7, by transmitting light of a wavelength of about 480 nm or less and reflecting light of a wavelength of more than about 480 nm, it is possible to make The laser light is transmitted while reflecting the fluorescent light.
(Embodiment 3)
A light source device according to Embodiment 3 of the present invention will be described below with reference to Figs. 8 and 9 .
The light source device 210 of the present embodiment is different from the first embodiment in which the plate-shaped light-transmitting phosphor 13 is used. As shown in FIG. 8, the light-transmitting fluorescent light having a convex shape on the side of the emitting surface 213b is used. Light body 213.
The other configuration of the light source device 210 is the same as that of the light source device 10 of the first embodiment, and therefore the same reference numerals will be given thereto, and detailed description thereof will be omitted.
As shown in FIG. 8 , the light source device 210 of the present embodiment includes a light source unit 11 , a collecting lens 12 , a light transmitting fluorescent body 213 , an introduction lens 14 , and an optical fiber 15 .
As shown in FIG. 9, the light-transmitting phosphor 213 has an incident surface 213a and an exit surface 213b. Further, in the translucent phosphor 213, a fluorescent light source unit 220 that emits fluorescence is formed in a portion where the laser light collected by the collecting lens 12 passes.
In addition, the fluorescent light source unit 220 has substantially the same shape and function as the fluorescent light source unit 20 of the first embodiment.
The incident surface 213a is a surface on the side of the collecting lens 12, and is disposed along a plane perpendicular to the propagation direction of the laser light.
The exit surface 213b is a surface on the side of the introduction lens 14 and has a curved surface that is convex toward the introduction lens 14.
Thereby, the fluorescence excited by the laser light irradiated to the light-transmitting phosphor 213 is in the exit surface 213b, and the refractive index difference in the interface between the light-transmitting phosphor 213 (YAG refractive index ≒ 1.8) and air is obtained. The generated divergence is suppressed and introduced into the introduction lens 14.
As a result, the size of the introduction lens 14 can be made small, and the size of the light source device 210 can be reduced.
Alternatively, even when the size of the introduction lens 14 is fixed, the degree of diffusion of the emitted fluorescent light is suppressed, so that the amount of fluorescence to be introduced can be increased.
Thereby, a light source that is more efficiently brightened can be obtained.
(Embodiment 4)
A light source device according to Embodiment 4 of the present invention will be described below with reference to Figs. 10 and 11 .
The light source device 310 of the present embodiment is different from the first embodiment in that a concave mirror 316 is provided between the collecting lens 12 and the translucent phosphor 313 as shown in FIG. 10, and an incident surface is provided. Both of the exit surfaces have a convex curved surface translucent phosphor 313.
The other configuration of the light source device 310 is the same as that of the light source device 10 of the first embodiment, and therefore the same reference numerals will be given thereto, and detailed description thereof will be omitted.
As shown in FIG. 10, the light source device 310 of the present embodiment includes a light source unit 11, a collecting lens 12, a concave mirror 316, a translucent phosphor 313, an introduction lens 14, and an optical fiber 15.
The concave mirror 316 is disposed between the condensing lens 12 and the translucent phosphor 313, and has a concave reflecting surface on the surface on the side of the translucent phosphor 313. Further, the concave mirror 316 has a characteristic of transmitting the laser light condensed by the condensing lens 12 and reflecting the fluorescent light emitted from the inside of the light-transmitting phosphor 313 as shown in FIG.
Thereby, the laser light irradiated from the light source unit 11 and condensed by the condensing lens 12 can be irradiated to the translucent phosphor 313 without being blocked by the concave mirror 316. Further, as shown in FIG. 11, the fluorescent light source unit 320 formed inside the light-transmitting phosphor 313 is radiated to the condensing lens 12 side by the fluorescent light source unit 320 formed inside the light-transmitting phosphor 313. The fluorescent reflection is returned to the side of the light-transmitting phosphor 313.
As a result, in the introduction lens 14, more fluorescence than the fluorescence introduced in the first embodiment can be introduced and collected on the first surface 15a of the optical fiber 15, so that further high brightness can be obtained. Light source.
Further, as shown in FIG. 11, the concave mirror 316 is disposed such that the center of the concave curved surface appears on the central axis A1 of the fluorescent light source unit 320.
Thereby, the reflected fluorescent light can be collected at the position of the portion (fluorescent light source portion 320) that emits fluorescence.
As a result, in the introduction lens 14, more fluorescence than the fluorescence introduced in the first embodiment can be introduced and collected on the first surface 15a of the optical fiber 15, so that higher brightness can be obtained more effectively. Light source.
Further, the concave mirror 316 preferably has a spherical or aspherical shape centering on a condensed point of the laser light condensed by the condensing lens 12 into the light-transmitting phosphor 313.
Thereby, the reflected fluorescent light can be collected by the fluorescent portion (fluorescent light source portion 320).
As a result, in the introduction lens 14, more fluorescence than the fluorescence introduced in the first embodiment can be introduced and collected on the first surface 15a of the optical fiber 15, so that higher brightness can be obtained more effectively. Light source.
Further, as the concave mirror 316, similarly to the concave mirror 116 of the second embodiment, a dichroic mirror or a lens in which a reflective film that reflects fluorescence is vapor-deposited on a concave surface of a meniscus lens can be used. A perforated mirror having an opening in the portion through which the laser light passes and reflecting the fluorescent light in the concave surface.
As shown in FIG. 11, the light-transmitting phosphor 313 has an incident surface 313a and an exit surface 313b.
The incident surface 313a is a surface on the side of the condensing lens 12, and has a curved surface that is convex toward the condensing lens 12.
Thereby, the fluorescence excited by the laser light irradiated to the light-transmitting phosphor 313 is incident on the incident surface 313a, and the refractive index difference at the interface between the light-transmitting phosphor 313 (YAG refractive index ≒1.8) and the air is obtained. The occurrence of divergence is suppressed and is introduced into the concave mirror 316.
As a result, the size of the concave mirror 316 can be reduced, and the size of the light source device 310 can be reduced.
Alternatively, even when the size of the concave mirror 316 is fixed, the degree of diffusion of the emitted fluorescent light can be suppressed, so that the amount of reflected fluorescent light in the concave mirror 316 can be increased.
Thereby, the fluorescent light can be more efficiently reflected by the concave mirror 316 to obtain a high-luminance light source.
On the other hand, the exit surface 313b is a surface on the side of the introduction lens 14 and has a curved surface that is convex toward the introduction lens 14.
Thereby, the fluorescence excited by the laser light irradiated to the translucent phosphor 313 is on the emission surface 313b, and the refractive index difference in the interface between the translucent phosphor 313 (YAG refractive index ≒1.8) and the air The generated diffusion is suppressed and introduced into the introduction lens 14.
As a result, the size of the introduction lens 14 can be reduced, and the size of the light source device 310 can be reduced.
Alternatively, even when the size of the introduction lens 14 is fixed, the degree of diffusion of the emitted fluorescent light is suppressed, so that the amount of fluorescence to be introduced can be increased.
Thereby, a light source that is more efficiently brightened can be obtained.
(Embodiment 5)
A light source device according to Embodiment 5 of the present invention will be described below with reference to Figs. 12 and 13 .
The light source device 410 of the present embodiment is different from the above-described first embodiment in that a concave mirror 416 is provided between the collecting lens 12 and the translucent phosphor 413 as shown in FIG. 12, and an incident surface is provided. A translucent phosphor 413 having a convex curved surface.
The other configuration of the light source device 410 is the same as that of the light source device 10 of the first embodiment, and therefore the same reference numerals will be given thereto, and detailed description thereof will be omitted.
As shown in FIG. 12, the light source device 410 of the present embodiment includes a light source unit 11, a collecting lens 12, a concave mirror 416, a translucent phosphor 413, an introduction lens 14, and an optical fiber 15.
The concave mirror 416 is disposed between the condensing lens 12 and the translucent phosphor 413, and has a concave reflecting surface on the surface on the side of the translucent phosphor 413. Further, the concave mirror 416 has a characteristic of transmitting the laser light condensed by the condensing lens 12 and reflecting the fluorescent light emitted from the inside of the light-transmitting phosphor 413 as shown in FIG.
Thereby, the laser light irradiated from the light source unit 11 and condensed by the condensing lens 12 can be irradiated to the translucent phosphor 413 without being blocked by the concave mirror 416. Further, as shown in FIG. 13, the fluorescent light source unit 420 formed inside the light-transmitting phosphor 413 is radiated to the collecting lens 12 side by the fluorescent light emitted from all the directions. The fluorescent reflection is returned to the side of the light-transmitting phosphor 413.
As a result, in the introduction lens 14, more fluorescence than the fluorescence introduced in the first embodiment can be introduced and collected on the first surface 15a of the optical fiber 15, so that further high brightness can be obtained. Light source.
Further, as shown in FIG. 13, the concave mirror 416 is disposed such that the center of the concave curved surface appears on the central axis A1 of the fluorescent light source unit 420.
Thereby, the reflected fluorescent light can be collected at the position of the fluorescent portion (fluorescent light source portion 420).
As a result, in the introduction lens 14, more fluorescence than the fluorescence introduced in the first embodiment can be introduced and collected on the first surface 15a of the optical fiber 15, so that higher brightness can be obtained more effectively. Light source.
Further, the concave mirror 416 preferably has a spherical or aspherical shape centering on a light collecting point of the laser light condensed by the collecting lens 12 into the light transmitting phosphor 413.
Thereby, the reflected fluorescent light can be collected by the fluorescent portion (fluorescent light source portion 420).
As a result, in the introduction lens 14, more fluorescence than the fluorescence introduced in the first embodiment can be introduced and collected on the first surface 15a of the optical fiber 15, so that higher brightness can be obtained more effectively. Light source.
Further, as the concave mirror 416, similarly to the concave mirror 116 of the second embodiment, a dichroic mirror or a lens in which a reflective film that reflects fluorescence is vapor-deposited on a concave surface of a meniscus lens can be used. A perforated mirror having an opening in the portion through which the laser light passes and reflecting the fluorescent light in the concave surface.
As shown in FIG. 13, the translucent phosphor 413 has an incident surface 413a and an exit surface 413b.
The incident surface 413a is a surface on the side of the condensing lens 12, and has a curved surface that is convex toward the condensing lens 12.
The exit surface 413b is a surface on the side of the introduction lens 14 and is disposed along a plane perpendicular to the propagation direction of the laser light.
Thereby, the fluorescent light emitted from all the azimuths excited by the laser light irradiated to the translucent phosphor 413 is incident on the incident surface 413a, and the interface between the translucent phosphor 413 (YAG refractive index ≒ 1.8) and the air is formed. The divergence occurring in the difference in refractive index is suppressed, and is introduced into the concave mirror 416.
As a result, the size of the concave mirror 416 can be reduced to achieve miniaturization of the light source device 410.
Alternatively, even when the size of the concave mirror 416 is fixed, the degree of diffusion of the emitted fluorescent light can be suppressed, so that the amount of reflected fluorescent light in the concave mirror 416 can be increased.
Thereby, the fluorescent light can be more efficiently reflected by the concave mirror 416 to obtain a light source having a high luminance.
(Embodiment 6)
A light source device according to Embodiment 6 of the present invention will be described below with reference to Figs. 14 to 16 .
The light source device 510 of the present embodiment is different from the above-described first embodiment in that a concave mirror 516 is provided between the translucent phosphor 13 and the introduction lens 14 as shown in FIG.
The other configuration of the light source device 510 is the same as that of the light source device 10 of the first embodiment, and therefore the same reference numerals will be given thereto, and detailed description thereof will be omitted.
As shown in FIG. 14 , the light source device 510 of the present embodiment includes a light source unit 11 , a condensing lens 12 , a translucent phosphor 13 , a concave mirror 516 , an introduction lens 14 , and an optical fiber 15 .
The concave mirror 516 is disposed between the light-transmitting phosphor 13 and the introduction lens 14 and has a concave reflecting surface on the incident surface on the side of the light-transmitting phosphor 13 . Further, the concave mirror 516 has a characteristic of transmitting the fluorescent light excited by the light-transmitting phosphor 13 and reflecting the laser light transmitted through the light-transmitting fluorescent body 13.
By this, the fluorescent light source unit 120 formed inside the light-transmitting phosphor 13 can be introduced into the introduction lens 14 without being irradiated to the introduction lens 14 in the fluorescence emitted from all directions. It will be blocked by the concave mirror 516.
Further, as shown in FIG. 15, the laser beam that is not absorbed and transmitted through the translucent phosphor 13 can be reflected by the concave mirror 516 and returned to the side of the translucent phosphor 13 .
As a result, in the light-transmitting phosphor 13, more excitation light than the laser light irradiated in the first embodiment can be introduced to excite the fluorescent light, and thus a light source which is further brightened more than before can be obtained.
Further, as shown in FIG. 15, the concave mirror 516 is disposed such that the center of the concave curved surface appears on the central axis A1 of the fluorescent light source unit 520.
Thereby, the reflected laser light can be collected again at the position of the portion (fluorescent light source portion 520) that emits fluorescence.
As a result, in the light-transmitting phosphor 13, more excitation light than the laser light irradiated in the first embodiment can be introduced to excite the fluorescent light, and thus a light source which is further brightened more than before can be obtained.
Further, the concave mirror 516 preferably has a spherical or aspherical shape centering on a condensed point of the laser light condensed by the condensing lens 12 into the light-transmitting phosphor 13.
Thereby, the reflected laser light can be collected again by the portion (fluorescent light source portion 520) that emits fluorescence.
As a result, in the introduction lens 14, more fluorescence than the fluorescence introduced in the first embodiment can be introduced and collected on the first surface 15a of the optical fiber 15, so that higher brightness can be obtained more effectively. Light source.
Further, as the concave mirror 516, a dichroic mirror or a lens in which a reflective film that reflects laser light is vapor-deposited on a concave surface of a meniscus lens can be used.
For example, in the case where a dichroic mirror is used as the concave mirror 516, as shown in FIG. 16, by reflecting light of a wavelength of about 480 nm or less and transmitting light of a wavelength of more than about 480 nm, it is possible to make The fluorescent light is transmitted while reflecting the laser light.
[Other embodiments]
The embodiment of the present invention has been described above, but the present invention is not limited to the embodiment, and various modifications can be made without departing from the spirit and scope of the invention.
(A)
In the fourth embodiment and the like, the light source device has been described as an example in which the light source device uses a translucent phosphor having a convex curved surface on at least one of an incident surface and an emission surface side. . However, the present invention is not limited to this.
For example, as shown in FIGS. 17( a ) and 17 ( b ), the translucent phosphor 613 may be used: the translucent phosphor 613 includes an incident surface 613 a and an exit surface 613 b. The incident surface 613a has a convex curved surface portion 613aa only at a portion where the laser light passes, and the outgoing surface 613b has a convex curved surface portion 613ba only at a portion where the fluorescent light passes.
(B)
In the above-described embodiment, an example in which the condensing lens is disposed so as to condense the laser light into the inside of the light-transmitting phosphor has been described. However, the present invention is not limited to this.
For example, the condensing lens may be disposed such that the laser light is condensed onto the surface of the light-transmitting phosphor.
In this case, the same effect as that of the above embodiment can be obtained by forming a substantially cylindrical fluorescent light source portion from the light collecting point on the surface of the light-transmitting phosphor to the inside.
Further, in consideration of the fact that the fluorescent light source portion is formed in front and rear with the focus point in the propagation direction of the laser light, it is preferably a light-transmitting phosphor that condenses the laser light by the collecting lens. The position is closer to the inside than the surface of the light-transmitting phosphor.
(C)
In the above-described embodiment, an example in which a single-crystal phosphor is used as the light-transmitting phosphor mounted on the light source device 10 has been described. However, the present invention is not limited to this.
For example, a translucent ceramic phosphor may be used instead of the single crystal phosphor.
(D)
In the above-described embodiment, the light source device 10 including the introduction lens and the optical fiber as a configuration has been described as an example. However, the present invention is not limited to this.
For example, a configuration in which the introduction lens or the optical fiber is not provided may be used as the light source device of the present invention.
(E)
In the above embodiment, an example in which the present invention is applied to the light source device 10 of the confocal measurement device (ranging sensor) 50 has been described. However, the present invention is not limited to this.
For example, the distance measuring sensor in which the light source device of the present invention is mounted is not limited to a distance measuring sensor such as a confocal measuring device, and other ranging sensors may be used.
Further, as a light source device, the present invention can also be applied to a headlight or a light source device of an endoscope.
[Industrial availability]

The light source device of the present invention has an effect of obtaining a light source having a higher brightness than the previous one, and thus can be widely applied to various light source devices.

10‧‧‧Light source device

11‧‧‧Light source department

12‧‧‧ Concentrating lens

13‧‧‧Translucent phosphor

13a‧‧‧Incoming surface

13b‧‧‧Outlet

14‧‧‧Introduction lens

15‧‧‧Fiber

15a‧‧‧1st

15b‧‧‧2nd

20‧‧‧Fluorescent light source department

20a‧‧‧Injection side profile

20b‧‧‧Reducing section

20c‧‧‧ outgoing side profile

50‧‧‧Common focus measuring device (ranging sensor)

51‧‧‧ head

51a‧‧·Diffractive lens (chromatic aberration focus lens)

51b‧‧‧ objective lens

51c‧‧‧ Concentrating lens

52‧‧‧Fiber

53‧‧‧Controller Department

54‧‧‧ monitor

55a, 55b‧‧‧ fiber

56‧‧‧Branch fiber

57‧‧‧ Spectroscope

57a‧‧‧ concave mirror

57b‧‧‧Diffraction grating

57c‧‧‧ Condenser lens

58‧‧‧Image sensor (light receiving unit)

59‧‧‧Control circuit unit (measurement unit)

110‧‧‧Light source device

116‧‧‧ concave mirror

120‧‧‧Fluorescent light source department

210‧‧‧Light source device

213‧‧‧Translucent phosphor

213a‧‧‧Incoming surface

213b‧‧‧Outlet

220‧‧‧Fluorescent light source department

310‧‧‧Light source device

313‧‧‧Translucent phosphor

313a‧‧‧Incoming surface

313b‧‧‧Outlet

316‧‧‧ concave mirror

320‧‧‧Fluorescent light source department

410‧‧‧Light source device

413‧‧‧Translucent phosphor

413a‧‧‧Incoming surface

413b‧‧‧Outlet

416‧‧‧ concave mirror

420‧‧‧Fluorescent light source department

510‧‧‧Light source device

516‧‧‧ concave mirror

520‧‧‧Fluorescent light source department

613‧‧‧Translucent phosphor

613a‧‧‧Incoming surface

613aa‧‧‧Surface Department

613b‧‧‧Outlet

613ba‧‧‧Face Department

A1‧‧‧ central axis

A2‧‧‧ lens central axis

T‧‧‧Measurement object

FIG. 1 is a schematic view showing a configuration of a confocal measurement device on which a light source device according to an embodiment of the present invention is mounted.

FIG. 2 is a schematic diagram showing a configuration of a light source device mounted in the confocal measurement device of FIG. 1. FIG.

Fig. 3 is a schematic enlarged view of a main part of the light source device of Fig. 2;

Fig. 4 is a schematic view showing the shape of a fluorescent light source unit formed inside the light-transmitting phosphor of Fig. 3;

FIG. 5 is a schematic diagram showing a configuration of a light source device according to Embodiment 2 of the present invention.

Fig. 6 is a schematic enlarged view of a main part of the light source device of Fig. 5;

Fig. 7 is a graph showing wavelength characteristics of a concave mirror (dichroic mirror) included in the light source device of Fig. 5.

FIG. 8 is a schematic diagram showing a configuration of a light source device according to Embodiment 3 of the present invention.

Fig. 9 is a schematic enlarged view of a main part of the light source device of Fig. 8.

FIG. 10 is a schematic diagram showing a configuration of a light source device according to Embodiment 4 of the present invention.

Fig. 11 is a schematic enlarged view of a main part of the light source device of Fig. 10.

FIG. 12 is a schematic diagram showing a configuration of a light source device according to Embodiment 5 of the present invention.

Fig. 13 is a schematic enlarged view of a main part of the light source device of Fig. 12;

FIG. 14 is a schematic diagram showing a configuration of a light source device according to Embodiment 6 of the present invention.

Fig. 15 is a schematic enlarged view of a main part of the light source device of Fig. 14;

Fig. 16 is a graph showing wavelength characteristics of a concave mirror (dichroic mirror) included in the light source device of Fig. 14.

17(a) and 17(b) are a side view and a rear view showing the shape of a light-transmitting phosphor included in a light source device according to another embodiment of the present invention.

Claims (16)

A light source device having: a light source portion that illuminates the laser light; a collecting lens that condenses the laser light irradiated from the light source portion; a translucent phosphor that emits fluorescence by being irradiated with the laser light collected by the collecting lens. The translucent phosphor has a fluorescent light source unit, and the fluorescent light source unit is formed in a portion where the laser light is collected by the collecting lens. The fluorescent light source unit has a long substantially cylindrical shape in a propagation direction of the laser light irradiated from the light source unit, and emits the firefly at a side opposite to an incident direction of the laser light. Light. A light source device having: a light source portion that illuminates the laser light; a collecting lens that condenses the laser light irradiated from the light source portion; a translucent phosphor that emits fluorescence by being irradiated with the laser light collected by the collecting lens. The translucent phosphor has a fluorescent light source unit, and the fluorescent light source unit is formed in a portion where the laser light is collected by the collecting lens. The fluorescent light source unit has a long substantially cylindrical shape in a propagation direction of the laser light irradiated from the light source unit, and emits the firefly in a longitudinal direction of the long substantially cylindrical shape. Light. The light source device according to claim 1 or 2, Further, the optical fiber is provided, and the optical fiber is introduced with the fluorescent light emitted from the fluorescent light source unit. The light source device of claim 1 or 2, wherein The light-transmitting phosphor has a scattering property to the extent that a light-converging point is formed inside the laser light when it is irradiated. The light source device according to any one of claims 1 to 4, wherein The laser light is condensed to the surface or inside of the light-transmitting phosphor by the condensing lens. The light source device according to any one of claims 1 to 5, Further, it further includes an introduction lens that condenses the fluorescent light emitted from the translucent phosphor. The light source device of claim 6, wherein The introduction lens is disposed such that a central axis of the lens coincides with a central axis of laser propagation of the laser light passing through the translucent phosphor. The light source device according to claim 6 or 7, Further, the optical fiber is provided with the fluorescent light collected by the introduction lens at the first end surface, and the fluorescent light is emitted from the second end surface opposite to the first end surface. . The light source device according to any one of claims 1 to 8, wherein The light-transmitting phosphor has a convex curved surface in at least one of an incident surface on which the laser light is incident and an exit surface on which the fluorescent light is emitted. The light source device according to any one of claims 1 to 9, wherein The light-transmitting phosphor is a single crystal phosphor. The light source device according to any one of claims 1 to 10, Further, the concave mirror is disposed on the incident surface side of the light-transmitting phosphor, transmits the laser light irradiated from the light source portion, and emits the light emitted from the light-transmitting phosphor Among the fluorescent light, the fluorescent light emitted to the incident surface side is reflected toward the light-transmitting phosphor side. The light source device according to any one of claims 1 to 10, Further, the concave mirror is disposed on the exit surface side of the light-transmitting phosphor, and reflects the laser light that has been irradiated from the light source portion and passed through the light-transmitting phosphor, and Among the fluorescent light emitted from the light-transmitting phosphor, the fluorescent light emitted to the exit surface side is transmitted. The light source device of claim 11 or 12, wherein The concave mirror has a spherical surface or an aspherical curved surface centered on a condensed point of the laser light condensed by the condensing lens. The light source device according to any one of claims 11 to 13, wherein The concave mirror is a dichroic mirror or a perforated mirror having an opening. A distance measuring sensor having: The light source device according to any one of claims 1 to 14, a light receiving unit that receives reflected light of light irradiated by the light source device, and The measuring unit measures the distance from the object based on the amount of light received by the light receiving unit. The ranging sensor according to claim 15 of the patent application, wherein The light source device emits fluorescence including a plurality of wavelengths, and the ranging sensor further has a chromatic aberration focus lens configured to further pass the fluorescent light, The light receiving portion receives the reflected light of the fluorescent light irradiated to the object via the chromatic aberration focus lens, and The measurement unit measures the distance from the object based on the wavelength of the fluorescent light in which the light receiving amount in the light receiving unit is the largest.