JP2015210872A - Semiconductor light emitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a semiconductor light emitting device which comprises a combination of a laser light source and an optical fiber, and can form a donut-shape (annular) irradiation pattern which scarcely has luminance unevenness and color unevenness.SOLUTION: A semiconductor light emitting device comprises: a laser light source 2; a condensing/collimating lens 3 which is arranged frontward in a laser light radiation direction of the laser light source 2, and condenses or collimates laser light which is radiated from the laser light source 2; an optical finer 10 which is arranged at an emission face side of the lens 3, and light-guides the laser light which is condensed or collimated by the lens 3; and a fluorescent body plate 30 which is light-guided in the optical fiber 10, and irradiated with the emitted emission laser light. The optical fiber 10 has a core 11 whose cross section shape vertical to longitudinal direction is rectangular, and is routed while being applied with a bend not smaller than 90° and torsion not smaller than 90°.

Description

  The present invention relates to a semiconductor light emitting device, and more particularly to a semiconductor light emitting device in which laser light emitted from a laser light source such as a semiconductor laser enters an optical fiber and the emitted light forms a desired irradiation pattern.

  Conventionally, as an optical fiber used in this type of semiconductor light emitting device, for example, there is a configuration disclosed in Patent Document 1 (see FIG. 14).

  It has a configuration in which a quartz core 81 having a rectangular cross section is covered with a resin-made clad 82 having a circular outer cross section, and the clad 82 is covered with a cylindrical protective layer 83. By making the laser light emitted from the laser light source incident on the optical fiber 80 having this configuration, the laser light emitted by being guided through the core 81 having a rectangular cross section of the optical fiber 80 has a uniform irradiation intensity. It is supposed to have.

JP 2009-168914 A

  Incidentally, the optical fiber 80 does not always require uniform irradiation intensity over the entire irradiation range with respect to the emitted laser light, and various irradiation intensity distributions are required depending on the use of the emitted light. There is a case.

  Specifically, a donut-shaped (annular) irradiation pattern may be required for the laser beam emitted from the optical fiber 80.

  As a method of obtaining a donut-shaped irradiation pattern by combining a laser light source and an optical fiber, for example, laser light emitted from one laser light source is branched into a plurality of optical fibers and arranged in a circular shape. A method of forming a donut-shaped irradiation pattern with the light emitted from the respective emission ends, or a laser beam emitted from each of a plurality of laser light sources is incident on each of a plurality of optical fibers and arranged in a circle There is a method of forming a donut-shaped irradiation pattern with the emitted light from each of the emitted light ends.

  However, in any of the above methods, the light emitted from each of the plurality of optical fibers forms a dot pattern, and the annular irradiation pattern is composed of a collection of dot patterns. Therefore, the irradiation pattern has luminance unevenness and color unevenness.

  Therefore, the present invention was devised in view of the above problems, and its object is to provide a combination of a laser light source and an optical fiber, and donut-shaped (annular) irradiation with almost no luminance unevenness and color unevenness. An object of the present invention is to provide a semiconductor light emitting device capable of forming a pattern.

  In order to solve the above-described problem, the invention described in claim 1 of the present invention includes a laser light source that emits laser light, and a laser light source arranged in front of the laser light emitting direction of the laser light source to collect the laser light. A collimating condensing / collimating lens, and an incident end located on the opposite side of the condensing / collimating lens from the laser light source, and laser light condensed or collimated by the condensing / collimating lens from the incident end. The optical fiber includes an optical fiber that is incident and guided, and the optical fiber has a core having a rectangular cross section perpendicular to the length direction, and is pulled by being bent by 90 ° or more and twisted by 90 ° or more. It is characterized by being turned.

  According to a second aspect of the present invention, in the first aspect of the present invention, the outgoing laser light guided in the optical fiber and emitted from the outgoing end is forward of the outgoing end of the optical fiber. It is characterized by having a wavelength conversion unit to be irradiated.

  Further, in the invention described in claim 3 of the present invention, in claim 1 or 2, the optical axis of the laser light source is shifted in parallel and shifted with respect to the central axis of the incident end of the core. It is arranged in a state or inclined with respect to the central axis.

  Further, in the invention described in claim 4 of the present invention, in claim 2 or claim 3, the wavelength converter is disposed at a position where a projected image by the emitted laser light is formed in a donut shape, The luminance distribution in the projected image is characterized in that the maximum luminance is twice or more the minimum luminance.

  The invention described in claim 5 of the present invention is characterized in that, in claim 4, distance variable means is provided so that the distance between the emission end and the wavelength conversion section can be varied. It is.

  Further, in the invention described in claim 6 of the present invention, in claim 5, the distance varying means is configured such that the projected image in the wavelength conversion unit indicates the distance between the wavelength conversion unit and the output end of the optical fiber. The distance between the donut shape and the distance at which the projected image in the wavelength conversion unit has a shape other than the donut shape is changed.

  According to a seventh aspect of the present invention, in the first aspect, the laser beam emitted from the emission end after being guided in the optical fiber is emitted in front of the emission end of the optical fiber. Reflecting means for reflecting is provided, and a wavelength conversion unit is provided at a position where the reflected laser beam reflected by the reflecting means is irradiated.

  Moreover, the invention described in claim 8 of the present invention is any one of claims 2 to 7, wherein the wavelength converter has either phosphor or a mixture of phosphor and light diffusing material. It is characterized by.

  The invention described in claim 9 of the present invention is the optical fiber according to any one of claims 1 to 8, wherein the optical fiber uses fixing means for holding the bending and twisting. It is what.

  The semiconductor light-emitting device of the present invention uses an optical fiber having a core whose cross-sectional shape perpendicular to the length direction is rectangular as an optical fiber that guides and emits laser light emitted from a laser light source. Was routed in a state where bending of 90 ° or more and twisting of 90 ° or more were applied.

  As a result, the laser beam emitted from the emission end of the optical fiber has a substantially heart-shaped directivity, and a donut shape (annular) reflecting the substantially heart-shaped directivity at a position more than a predetermined distance from the emission end. The irradiation pattern is formed.

It is explanatory drawing of the basic composition of a semiconductor light-emitting device. It is AA sectional drawing of FIG. It is explanatory drawing which shows the relationship between an optical fiber and a projection image. It is a figure which shows the directivity characteristic of the radiation laser beam from a laser light source. It is a figure which shows the directivity characteristic of the emitted laser beam from the output end of an optical fiber. It is explanatory drawing which prescribes | regulates the magnitude | size of a projection image. It is a graph which shows the relationship between the distance from the output end of an optical fiber, and the magnitude | size of a projection image. It is a figure which shows the directional characteristic of the drawing | extracting state of the core of an optical fiber, and the emitted laser beam from an output end. Similarly, it is a figure which shows the directional characteristic of the extraction | drawer state of the core of an optical fiber, and the emitted laser beam from an output end. Similarly, it is a figure which shows the directional characteristic of the extraction | drawer state of the core of an optical fiber, and the emitted laser beam from an output end. It is a block diagram of a reflective illumination lamp. It is a block diagram of the illumination lamp for cameras. It is a block diagram of a portable illuminating device. It is explanatory drawing of a prior art example. It is a photograph of the projection image of an emitted laser beam.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 1 to 13 and FIG. 15 (the same reference numerals are given to the same portions). The embodiments described below are preferable specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention particularly limits the present invention in the following description. Unless stated to the effect, the present invention is not limited to these embodiments.

  FIG. 1 is an explanatory diagram of a basic configuration of a semiconductor light emitting device of the present invention. The semiconductor light-emitting device 1 includes one laser light source (for example, a semiconductor laser) 2 serving as a light source, and condenses or collimates the laser light emitted from the laser light source 2 disposed in front of the laser light source 2 in the laser light emission direction. A condensing / collimating lens (hereinafter abbreviated as “lens”) 3, an optical fiber 10 disposed on the exit surface side of the lens 3 to guide the laser light condensed or collimated by the lens 3; A phosphor plate (wavelength conversion unit) 30 to which the emitted laser light guided and emitted through the optical fiber 10 is irradiated is provided.

  Among them, the laser light source 2 has a configuration in which a laser diode element having an emission wavelength in a blue wavelength region (for example, 450 nm), a near ultraviolet wavelength region (for example, 405 nm) or other wavelength region is mounted on a CAN type package. Yes. Among them, GaN or the like is used as an element material for a laser diode element that emits laser light in a blue wavelength region having an emission wavelength of 450 nm.

  The optical fiber 10 (see FIG. 2 (AA sectional view in FIG. 1)) has a rectangular cross section perpendicular to the length direction (square or rectangular) and a core 11 having a cross section perpendicular to the length direction. The clad 12 is covered with a circular clad 12, and the clad 12 has a configuration in which a cross section perpendicular to the longitudinal direction is covered with a circular clad layer 13. The material of the core 11 is preferably quartz, the material of the clad 12 may be quartz or resin, and the material of the coating layer 13 is made of acrylic resin, for example.

  The phosphor plate 30 is formed by dispersing phosphor particles in a binder and forming a predetermined shape, or by firing as a ceramic phosphor.

  In the case of using laser light in a blue wavelength region having a wavelength of 450 nm, the phosphor is a yellow phosphor that is excited by blue light and wavelength-converted to yellow light. The phosphor plate 30 emits from the laser light source 2. Light of a hue close to that of white light is emitted by additive color mixing of part of the blue light that has been wavelength-converted by exciting the yellow phosphor and part of the blue light emitted from the laser light source. The For example, Ce-doped YAG is used as the yellow phosphor. In order to form white light, a green phosphor and a red phosphor can be used in combination.

  When using laser light in the near-ultraviolet wavelength region with a wavelength of 405 nm, the red phosphor, green phosphor, and blue phosphor that are excited by the near-ultraviolet light and converted into red light, green light, and blue light, respectively. A mixed phosphor is used, and from the phosphor plate 30, a part of the blue light emitted from the laser light source 2 is wavelength-converted by exciting the red phosphor, and a part of the blue light is green. White light is emitted by additive color mixture of green light wavelength-converted by exciting the phosphor and blue light wavelength-converted by part of the blue light exciting the blue phosphor. In order to form white light, a blue phosphor and a yellow phosphor can be used in combination.

  The phosphor plate 30 can have a diffusion function of diffusing the irradiated laser beam simultaneously with the wavelength conversion function of the phosphor described above. In that case, the phosphor plate 30 may be formed by dispersing phosphor particles of the wavelength converting material and, for example, alumina particles of the diffusing material in a binder. For example, a diffusion plate obtained by firing alumina into a plate shape and YAG: Ce. The phosphor plate 30 may be formed by pasting the phosphor plate fired into a plate shape with a translucent resin or glass. Further, the phosphor plate 30 may be formed by bonding a diffusion plate obtained by firing alumina into a plate shape and a fluorescent plate obtained by firing YAG: Ce into a plate shape by firing through alumina or the like.

  In addition, it is also possible to arrange a reflection light shielding member on the side surface of the phosphor plate 30. The arrangement of the reflection / shielding member is an effective means for preventing light leakage from the side surface of the phosphor plate 30 and improving the light use efficiency. As the reflection / shielding member, for example, a white resin in which titanium oxide particles are dispersed in a resin can be used.

  The phosphor plate 30 is disposed at a position away from the emission end of the optical fiber by a predetermined distance. Specifically, it is arranged at a position where a donut-shaped (annular) projected image 4 is formed on the phosphor plate 30. The donut shape in the semiconductor light emitting device of the present invention means that the maximum luminance (peak) in the luminance distribution of the projected image becomes twice or more the minimum luminance as shown in FIG. Here, the optical fiber 10 (particularly, the core 11 having a rectangular cross section) is subjected to predetermined bending and twisting as shown in FIG. 1, whereby the outgoing laser light emitted from the outgoing end of the optical fiber 10. It is possible to control the directivity and the irradiation pattern (projected image) formed by the emitted laser beam.

  Below, the present inventors have newly found the state of the optical fiber 10 having the core 11 having a rectangular cross-sectional shape perpendicular to the length direction, and the outgoing laser light emitted from the emission end of the optical fiber 10. The relationship between the directivity and the irradiation pattern (projected image) formed by the emitted laser beam will be described.

  First, as shown in FIG. 3, the lens 3 is disposed in front of the laser light source 2 in the laser light emission direction, and the optical fiber 10 is disposed on the opposite side (outgoing surface side) of the lens 3 from the laser light source 2. Projection screens (A) and (B) are arranged in the near field and the far field in front of the far field in front of the emission end 10b. The optical fiber 10 has been subjected to predetermined bending and twisting.

  Then, the laser light source 2 is driven to cause the laser light emitted from the laser light source 2 to be incident on the optical fiber 10 through the lens 3, and is guided through the optical fiber 10 and emitted from the emission end 10 b. Light was applied to the projection screen (A) located in the far field of Farfield and the projection screen (B) located in the far field of Farfield. As a result, projection images such as photographs shown in FIGS. 3 and 15 were obtained.

  As shown in FIG. 15, the emitted laser light emitted from the emission end of the optical fiber 10 and applied to the projection screen (A) located in the near field of the far field is the shape of the emission end 10 b of the core 11 of the optical fiber 10. A rectangular projection image 40 (FIG. 3) is formed as is (see FIG. 15A). On the other hand, the outgoing laser light irradiated on the projection screen (B) located in the far field of the far field is donut-shaped (annular) reflecting the substantially heart-shaped directivity characteristic of the outgoing laser light at the outgoing end of the optical fiber 10. A projection image 41 (FIG. 3) was formed (see FIG. 15B).

  At this time, it has been confirmed that the emitted laser light of the laser light source 2 has directivity characteristics as shown in FIG. 4 by directivity simulation. The confirmed directivity has a substantially fan-shaped directivity so that the luminous intensity shows a substantially uniform peak value in a range of about ± 25 ° with respect to the central axis X (0 °) of the laser light source 2. Yes.

  On the other hand, it was confirmed that the outgoing laser light guided through the optical fiber 10 and emitted from the outgoing end similarly has directivity characteristics as shown in FIG. 5 by directivity simulation. The confirmed directivity is a substantially heart-shaped directivity in which the luminous intensity has peak values in two directions of about + 17 ° and about −17 ° with respect to the central axis x (0 °) of the core 11 of the optical fiber 10. It has characteristics.

  Further, as shown in FIG. 6, in the luminance distribution of the projected image 41 projected on the screen, if the distance D between the two peak values is the size of the projected image, the distance L from the emission end 10b of the optical fiber 10 And the size D of the projected image projected onto the position of the distance varies depending on the NA of the core 11 as shown in the graph of FIG.

  That is, the distance from the emission end of the optical fiber required until the emission laser light emitted from the emission end of the optical fiber 10 forms the donut-shaped projection image 41 is the same as the length of the optical fiber 10. The shorter the NA of the core 11, the shorter the cross-sectional area of the core 11.

  Specifically, when the distance from the output end 10b of the optical fiber 10 is set to a predetermined distance, in other words, when the screen is disposed at a position away from the output end 10b of the optical fiber 10 by a predetermined distance, On the top, a larger donut-shaped projection image is formed as the NA of the core 11 of the optical fiber 10 increases.

  By the way, the inventors added bending and twisting to an optical fiber having a core with a rectangular cross section until the emitted laser light emitted from the emission end of the optical fiber forms a donut-shaped projection image. It was confirmed that the required distance from the output end of the optical fiber can be shortened.

  FIG. 8 to FIG. 10 respectively show the drawn state (a) of the core 11 having a rectangular cross section of the optical fiber and the directivity characteristic (b) of the outgoing laser light emitted from the outgoing end of the optical fiber 10 at that time. ing.

  When the core 11 has a bend of 90 ° with an appropriate radius of curvature (see FIG. 8A), the directivity is in a fixed direction, specifically about −8 ° with respect to the central axis x of the core 11. In such a direction, the light intensity has a biased characteristic (see FIG. 8B) so as to show a peak value. Therefore, in this case, the projected image in the far field of the outgoing laser light emitted from the outgoing end of the optical fiber does not become a donut shape. In this case, the optical fiber is not twisted. That is, by applying at least 90 ° bending to the optical fiber, that is, by adding 90 ° or more bending, it is possible to obtain a directional characteristic in which the main peak is unevenly distributed (exist on the center axis).

  When the core 11 has a bend of 90 ° and a twist of 90 ° with an appropriate radius of curvature (see FIG. 9A), the directivity is about + 8 ° with respect to the central axis x (0 °) of the core 11. It has a substantially heart-shaped characteristic (see FIG. 9B) such that the luminous intensity shows a peak value in two directions of −3 °. Accordingly, in this case, the projected image in the far field of the emitted laser light emitted from the emission end of the optical fiber has a donut shape. This is presumably because the four reflecting surfaces along the core central axis, which are formed by the interface between the core and the clad having a rectangular cross section, are inclined by twisting the optical fiber. That is, by applying a twist of at least 90 °, that is, by applying a twist of 90 ° or more, it is possible to obtain directivity characteristics that two peaks have on the left and right sides of the central axis.

  When the core 11 has 2.5 turns with an appropriate radius of curvature and 90 ° twist (see FIG. 10A), the directivity is about ± with respect to the central axis x (0 °) of the core 11. It has a substantially heart-shaped characteristic (see FIG. 10B) in which the luminous intensity shows a peak value in two directions of 20 °. Accordingly, in this case, the projected image in the far field of the emitted laser light emitted from the emission end of the optical fiber has a donut shape. From the above results, it is understood that by applying a bend of at least 90 ° to the optical fiber, that is, by applying a bend of 90 ° or more (2.5 turns corresponds to 900 ° bend), It has been confirmed that a projected image can be obtained.

  As described above, when the core 11 has a 90 ° bend and a 90 ° twist with an appropriate radius of curvature, and when the core 11 has a 2.5 turn and a 90 ° twist with an appropriate radius of curvature. In both cases, the directivity characteristics of the emitted laser light emitted from the emission end 10b of the core 11 having a rectangular cross section of the optical fiber 10 has a substantially heart-shaped characteristic.

  However, when comparing the two having a substantially heart-shaped directivity, the core 11 is more likely to be centered on the central axis x (0 °) of the core 11 when the winding of the core 11 is applied than when only bending is performed. On the other hand, the angle indicating the peak value of the luminous intensity is large, and the angle range indicating the luminous intensity close to the peak value is wide. In other words, in the substantially heart-shaped directivity characteristic, when the winding of the core 11 is applied as compared with the case of bending only, the two convex portions are directed to the central axis x (0 °) of the core 11. The angle is large and the width is wide.

  Due to such directivity, the projected image formed in the far field becomes a donut shape having a large diameter and a wide width by being wound and drawn around a core having a rectangular cross section.

  Therefore, when the size of the donut-shaped projection image is set to a predetermined size, the emitted laser light emitted from the output end of the optical fiber having a core having a rectangular cross section is projected into the donut-shaped projection having the predetermined size. The distance from the output end of the optical fiber necessary for forming an image can be shortened as the bending is performed in the bending and twisting processes. The bending angle, the number of turns, and the radius of curvature are preferably designed as appropriate in consideration of optical loss due to bending.

  In addition, the laser emitted from the laser light source in a state where the optical axis of the laser light source is parallel and shifted with respect to the central axis of the incident end of the core having a rectangular cross section or the optical axis of the laser light source is inclined. By making the light enter the optical fiber through the incident end, the distance required for the emitted laser light emitted from the emission end to form a donut-shaped projection image of a predetermined size can be further shortened. It becomes possible.

  Moreover, it is preferable to provide a fixing means for holding the shape of the optical fiber that has been bent and twisted. For example, fixing means such as filling and fixing the optical fiber with an appropriate material such as silicone resin or providing a guide along the optical fiber can be provided.

  Furthermore, distance variable means that can change the distance between the wavelength conversion section and the output end of the optical fiber can be provided according to the application of the semiconductor light emitting device. The distance variable means may be a means for moving the position of the wavelength conversion section, a means for moving the position of the output end of the optical fiber, or a means for moving both the position of the wavelength conversion section and the position of the output end of the optical fiber. Good. The distance variable means can change the distance between the wavelength conversion unit and the output end of the optical fiber so that the size of the donut-shaped projection image in the wavelength conversion unit changes. Further, by the distance varying means, the distance between the wavelength conversion unit and the output end of the optical fiber is set between the distance at which the projection image at the wavelength conversion unit has a donut shape and the distance at which the projection image has a shape other than the donut shape. It can also be changed.

  Next, a practical example based on the basic configuration will be described.

  FIG. 11 is a configuration diagram of a ceiling-hanging type reflective illumination lamp 50.

  In this illuminating lamp 50, a pair of laser light sources 2 that emit blue light (emission wavelength is 445 nm, for example) are connected to a pair of controller / power supply units 52 that are connected to a power supply hook 51, respectively. A lens 3 is disposed in front of the radiation direction and includes a pair of optical fibers 10 having a core with a rectangular cross section and extending from the opposite side of the lens 3. Each optical fiber 10 is twisted at the same time as being wound in multiple layers.

  A substantially conical mirror 54 is arranged in front of the end 53 of the optical fiber 10 in the emission direction. The mirror 54 includes a convex mirror part 54a and a concave mirror part 54b. A phosphor portion (wavelength conversion portion) 55 is disposed on the oblique side of the mirror 54. In the phosphor portion 55, for example, a yellow phosphor layer made of YAG: Ce is provided on a uniform diffuse reflection member made of a titanium oxide diffusion resin and a white alumina film.

  Therefore, the blue laser light emitted from the laser light source 2 is collected by the lens 3 and is incident on the optical fiber (multiple mode) 10. The laser light entering the optical fiber 10 is refracted while being multiplexed and simultaneously refracted through the twisted optical fiber 10 (at this time, coherency is also reduced). The emitted laser light emitted from the end portion 53 of the optical fiber 10 has a donut-shaped luminance distribution in the vicinity of a point 10 to 20 times longer than the core diameter (short side reference) having a rectangular cross section due to multiple refraction during light guide. . At this position, a mirror 54 composed of a convex mirror portion 54a and a concave mirror portion 54b is arranged, and the emitted laser light irradiated to the convex mirror portion 54a widens the irradiation range and enters the phosphor portion 55a. The outgoing laser beam reflected (enlarged reflected) toward the concave mirror part 54b is reflected (reduced reflection) toward the phosphor part 55b with the irradiation range narrowed.

  The donut-shaped blue irradiation light irradiated to the phosphor portion 55a and the donut-shaped blue irradiation light irradiated to the phosphor portion 55b are incident on the phosphor portion 55a and the phosphor portion 55b, respectively, and a part thereof is yellow. Excitation of the phosphor converts the wavelength to yellow light, part of the light reaches the uniform diffuse reflection member and is uniformly reflected, and a part of the reflected light is converted to yellow light by exciting the yellow phosphor. At the same time, a part is emitted as it is. Thereby, light having a hue close to white light is emitted by additive color mixture of the diffusely reflected blue laser light and the yellow light wavelength-converted by the phosphor.

  Note that the white light emitted from the phosphor portion 55a irradiated with the emitted laser beam whose irradiation range is widened by the convex mirror portion 54a is reduced in luminance, and the emission laser whose irradiation range is narrowed by the concave mirror portion 54b. White light emitted from the phosphor portion 55b irradiated with the light is increased in luminance. When a plane mirror is used for the mirror part, the intermediate brightness is obtained.

  FIG. 12 is a configuration diagram of the camera illumination lamp 60.

  The camera illumination lamp 60 is provided with an annular phosphor part (wavelength conversion part) 62 so as to surround an imaging part 61 of the camera. The phosphor part 62 is a mixture of YAG: Ce and an alumina sintered body. An end 63 of the optical fiber 10 is located immediately above the imaging unit 61, and the optical fiber 10 has the lens 3 disposed in front of the laser light emission direction of the laser light source 2 that emits blue light (emission wavelength is 445 nm, for example). Then, it is wound in multiple directions from the opposite side of the lens 3 and twisted and drawn.

  Reference numerals 64 to 67 denote a holding glass for the phosphor portion, a laser control portion, an image sensor control portion, and a power source, respectively.

  Therefore, the blue laser light emitted from the laser light source 2 is collected by the lens 3 and is incident on the optical fiber (multiple mode) 10. The laser light entering the optical fiber 10 is refracted while being multiplexed and simultaneously refracted through the twisted optical fiber 10 (at this time, coherency is also reduced). The emitted laser light emitted from the end 63 of the optical fiber 10 has a donut-shaped luminous intensity distribution in the vicinity of a point 10 to 20 times longer than the core diameter (short side reference) having a rectangular cross section due to multiple refraction during light guide. . At this position, a phosphor portion 62 having substantially the same shape and dimension as the donut-shaped luminance distribution is provided, and the blue irradiation light irradiated to the phosphor portion 62 is incident on the phosphor portion 62 and a part thereof Is converted into yellow light by exciting the yellow phosphor, and a part of the light is diffused by the alumina sintered body. Therefore, white light is added by additive color mixture of the yellow wavelength converted light and the blue diffuse transmission laser light. Diffuse light with a hue close to is emitted.

  In order to obtain white light having high color rendering properties, a mixed phosphor in which a phosphor light source is mixed with a red phosphor, a green phosphor and a blue phosphor using a laser light source in the near ultraviolet wavelength region having an emission wavelength of 405 nm. Alternatively, a laminated phosphor in which each color phosphor is laminated can be used.

  FIG. 13 is a configuration diagram of the portable lighting device 70.

  The portable lighting device 70 includes a cylindrical main body 71 having a laser light source 2, a lens 3 positioned in front of the laser light source 2 in the laser light emission direction, and a core having a rectangular cross section extending from the opposite side of the lens 3. The optical fiber 10 is fixed. The optical fiber 10 is twisted at the same time as being wound multiple times.

  In front of the end portion 72 of the optical fiber 10, a flange 74 that holds a phosphor portion (wavelength conversion portion) 73 that is movable toward and away from the end portion 72 is provided. A lens 77 is provided. The flange 74 can be moved via the connecting stay 76 (in the S and W directions) by moving a position lever 75 provided outside the main body portion 71 in the longitudinal direction (PS and PW directions) of the main body portion 71.

  Reference numerals 78 and 79 denote a battery and a lighting control unit, respectively.

  Therefore, when the position lever 75 is set to the PS position, the flange 74 is set to the S position approaching the end portion 72 of the optical fiber 10. At this position, the projection image irradiated onto the phosphor portion 73 is rectangular and small and has high luminance, and the light source projection image transmitted through the lens 77 is also small and has high luminance.

  On the other hand, when the position lever 75 is set to the PW position, the flange 74 is set to the W position away from the end portion 72 of the optical fiber 10. At this position, the projection image irradiated on the phosphor portion 73 is donut-shaped and has a low luminance, and the light source projection image transmitted through the lens 77 has a large and low luminance.

  Thereby, the laser output from the illumination device 70 can be adjusted.

  If the position lever 75 and the laser output of the laser light source 2 can be controlled in conjunction with each other so that the laser output increases when the position lever 75 reaches the PW position, the lens 77 can be adjusted. Even if the transmitted light source projection image becomes large, a decrease in luminance is prevented and a predetermined luminance can be secured.

DESCRIPTION OF SYMBOLS 1 ... Semiconductor light-emitting device 2 ... Laser light source 3 ... Condensing and collimating lens 4 ... Projection image 10 ... Optical fiber 10b ... Output end 11 ... Core 12 ... Cladding 13 ... Covering layer 30 ... Phosphor plate 40 ... Projection image 41 ... Projection Image 50 ... Illuminating lamp 51 ... Feeding hook 52 ... Controller / power supply unit 53 ... End 54 ... Mirror 54a ... Convex mirror unit 54b ... Concave mirror unit 55 ... Phosphor part 55a ... Phosphor part 55b ... Phosphor part 60 Illuminating lamp 61 for camera ... Imaging unit 62 ... Phosphor portion 63 ... End portion 70 ... Portable illumination device 71 ... Main body portion 72 ... End portion 73 ... Phosphor portion 74 ... Flange 75 ... Position lever 76 ... Connecting stay 77 ... Lens 78 ... Battery 79 ... Lighting controller

Claims (9)

A laser light source that emits laser light;
A condensing / collimating lens that is disposed in front of the laser light source in the laser light emission direction and condenses or collimates the laser light;
An optical fiber in which an incident end is positioned on the opposite side of the condensing / collimating lens from the laser light source, and laser light condensed or collimated by the condensing / collimating lens is incident and guided from the incident end. With
The optical fiber has a core having a rectangular cross-section perpendicular to the length direction, and is routed by being bent by 90 ° or more and twisted by 90 ° or more. .   2. The wavelength conversion unit according to claim 1, further comprising: a wavelength conversion unit that is guided in the optical fiber and irradiated with outgoing laser light emitted from the outgoing end in front of the outgoing end of the optical fiber. Semiconductor light emitting device.   The laser light source is disposed in a state in which an optical axis thereof is parallel and shifted with respect to a central axis of the incident end of the core, or is inclined with respect to the central axis. A semiconductor light emitting device according to claim 1.   The wavelength conversion unit is disposed at a position where a projected image by the emitted laser light is formed in a donut shape, and the luminance distribution in the projected image has a maximum luminance that is twice or more a minimum luminance. The semiconductor light-emitting device of Claim 2 or Claim 3.   5. The semiconductor light emitting device according to claim 4, wherein a distance varying means is provided so that the distance between the emission end and the wavelength conversion unit can be varied.   The distance variable means includes a distance between the wavelength conversion unit and the output end of the optical fiber, a distance at which the projection image at the wavelength conversion unit has a donut shape, and a projection image at the wavelength conversion unit has a shape other than a donut shape. The semiconductor light emitting device according to claim 5, wherein the semiconductor light emitting device is changed between   Reflecting means is provided in front of the output end of the optical fiber to reflect the emitted laser light guided through the optical fiber and emitted from the output end, and the reflected laser light reflected by the reflecting means is reflected. The semiconductor light-emitting device according to claim 1, further comprising a wavelength conversion unit at an irradiation position.   The semiconductor light-emitting device according to claim 2, wherein the wavelength conversion unit includes any one of a phosphor or a mixture of a phosphor and a light diffusing material.   9. The semiconductor light emitting device according to claim 1, wherein the optical fiber uses fixing means for holding the bending and the twisting. 10.