JP2011054759A - Wavelength converting member-holding member and method of manufacturing the same, heat radiation structure of the wavelength converting member, and light-emitting device - Google Patents

Wavelength converting member-holding member and method of manufacturing the same, heat radiation structure of the wavelength converting member, and light-emitting device Download PDF

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JP2011054759A
JP2011054759A JP2009202360A JP2009202360A JP2011054759A JP 2011054759 A JP2011054759 A JP 2011054759A JP 2009202360 A JP2009202360 A JP 2009202360A JP 2009202360 A JP2009202360 A JP 2009202360A JP 2011054759 A JP2011054759 A JP 2011054759A
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light
holding
wavelength conversion
heat
emitting device
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Katsuhiko Kishimoto
克彦 岸本
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Sharp Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To promote cost reduction by simplifying a heat radiation structure of a wavelength conversion member by causing a holding member to function to conduct heat. <P>SOLUTION: The holding member 5 holds the wavelength conversion member 5 which is irradiated with laser light to convert it into light of a different wavelength and to radiate it and includes a holding part 6a holding the wavelength conversion member 5, and a plurality of fitting support parts 6b extended outward from the holding part 6a. The holding part 6a is integrated with the fitting support members 6b with a favorable heat conductive material. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

この発明は、レーザ光の照射を受けて異なる波長の光に変換して放射する波長変換部材の保持部材とその製造方法、波長変換部材の放熱構造、発光装置に関する。   The present invention relates to a holding member for a wavelength conversion member that receives a laser beam and converts it into light of a different wavelength and emits it, a method for manufacturing the same, a heat dissipation structure for the wavelength conversion member, and a light emitting device.

従来、半導体レーザ素子(LD)と、このレーザ光を導光する屈曲可能な光ファイバと、この光ファイバに導光されたレーザ光の照射を受けて異なる波長の光に変換して放射する波長変換部材とを有する発光装置であって、この光ファイバの端部に波長変換部材を保持する保持部材を備えた発光装置が知られている(特許文献1参照)。   Conventionally, a semiconductor laser element (LD), a bendable optical fiber that guides the laser light, and a wavelength that is irradiated with the laser light guided to the optical fiber and converted into light of a different wavelength and emitted. 2. Description of the Related Art A light-emitting device that includes a conversion member and includes a holding member that holds a wavelength conversion member at the end of the optical fiber is known (see Patent Document 1).

この発光装置では、光源として半導体レーザ素子を用いているので、光源として、例えば、ハロゲンランプなどを用いる場合に比べて、光源から出射される光の輝度を高くすることが可能である。   In this light emitting device, since the semiconductor laser element is used as the light source, the luminance of the light emitted from the light source can be increased as compared with the case where a halogen lamp or the like is used as the light source.

しかしながら、波長変換部材でレーザ光の波長が変換される際に一部熱エネルギーにも変換され、レーザ光の照射された部分で局所的に発熱し、波長変換部材が劣化(変色や変形)する場合がある。このため、波長変換部材の熱を放熱しないと発光装置の寿命が短くなるという問題点がある。   However, when the wavelength of the laser beam is converted by the wavelength conversion member, it is also partially converted into thermal energy, and heat is locally generated in the portion irradiated with the laser beam, and the wavelength conversion member is deteriorated (discolored or deformed). There is a case. For this reason, there is a problem that the lifetime of the light emitting device is shortened unless the heat of the wavelength conversion member is dissipated.

そこで、上記特許文献1では、保持部材に、ワイヤ状やパイプ状の熱伝導部材の一端を熱的に接続し、この熱伝導部材を、光ファイバに沿って延伸することにより、波長変換部材で発生した熱を熱伝導部材を介して搬送し、放熱するようにした放熱構造が開示されている。   Therefore, in Patent Document 1 described above, one end of a wire-like or pipe-like heat conducting member is thermally connected to the holding member, and the heat conducting member is stretched along the optical fiber, so that the wavelength converting member is used. A heat dissipating structure is disclosed in which generated heat is conveyed through a heat conducting member to dissipate heat.

特開2007−335514号公報(請求項1、請求項4、図1等参照)JP 2007-335514 A (refer to claim 1, claim 4, FIG. 1 etc.)

しかし、上記特許文献1の放熱構造は、熱伝導部材が保持部材とは別体で構成されたものであるため、部品点数が多く、構造が複雑となる問題があった。また、熱伝導部材は屈曲可能な光ファイバに沿って放熱側に導かれるので、構造上にも制限があり、波長変換部材の発熱量が大きくなると、充分な放熱が出来なくなるという問題がある。   However, the heat dissipation structure of Patent Document 1 has a problem in that the number of parts is large and the structure is complicated because the heat conducting member is formed separately from the holding member. Further, since the heat conducting member is guided to the heat radiating side along the bendable optical fiber, there is a limitation on the structure, and there is a problem that sufficient heat radiation cannot be performed when the heat generation amount of the wavelength conversion member increases.

本発明は、上記問題に鑑み、波長変換部材の保持部材に、当該波長変換部材を所定位置に取り付ける取付部材の機能と、放熱部材への熱伝導部材の機能を兼ねさせることで、波長変換部材の放熱構造を簡素化すると共に放熱効果の向上を図ることを目的とする。   In view of the above problems, the present invention allows the wavelength conversion member holding member to have both the function of the mounting member for attaching the wavelength conversion member to a predetermined position and the function of the heat conduction member to the heat radiating member. An object of the present invention is to simplify the heat dissipation structure and improve the heat dissipation effect.

上記目的を達成するために、本発明は、レーザ光の照射を受けて異なる波長の光に変換して放射する波長変換部材を保持する保持部材であって、前記波長変換部材を保持する保持部と、該保持部から、前記レーザ光の照射光軸の外周方向に突設された取付支持部とを有し、前記保持部と前記取付支持部とが良熱伝導材料により一体に形成されたことを特徴としている。   In order to achieve the above object, the present invention provides a holding member for holding a wavelength conversion member that receives a laser beam and converts it into light of a different wavelength and emits it, and holds the wavelength conversion member. And a mounting support portion protruding from the holding portion in the outer peripheral direction of the laser light irradiation optical axis, and the holding portion and the mounting support portion are integrally formed of a heat-conductive material. It is characterized by that.

この構成によると、保持部材の保持部と取付支持部とが良熱伝導材料により一体に形成されているので、波長変換部材で発生した熱は、保持部に直接伝達され、一体に形成した取付支持部内を伝熱するので、熱伝導部材が保持部材とは別体で構成されたものに比べて、構造が簡単な上、放熱効率が向上する。従って、波長変換部材の大部分に放熱用の部材を接合する必要がなく、最低限の面積を接合面とすれば良いので、小さい発光点を実現する場合に好適となる。   According to this configuration, since the holding portion of the holding member and the mounting support portion are integrally formed of a good heat conductive material, the heat generated by the wavelength conversion member is directly transmitted to the holding portion, and the integrally formed mounting Since heat is transferred in the support portion, the structure is simple and the heat dissipation efficiency is improved as compared with the case where the heat conducting member is formed separately from the holding member. Therefore, it is not necessary to join a heat radiating member to most of the wavelength conversion member, and a minimum area may be used as the joining surface, which is suitable for realizing a small light emitting point.

また、前記取付支持部をもって、放熱部材に取り付けた場合には、波長変換部材を所定場所に位置させると同時にこの波長変換部材の放熱構造が得られ、前記取付支持部を介して効果的な放熱を行うことができる。   In addition, when the mounting support portion is attached to the heat radiating member, the wavelength conversion member is positioned at a predetermined place, and at the same time, a heat radiating structure of the wavelength conversion member is obtained, and effective heat dissipation is achieved via the mounting support portion. It can be performed.

しかも、取付支持部間は空間となるので、重量が重く成らず、波長変換された光が保持部材を通過する構造とした場合でもにあまり光の通過の妨げにならず、発光装置にも好適となる。また、波長変換部材の発熱量が大きい場合には、取付支持部の径を少し太くしたり、取付支持部の数を増やすことにより、容易に対応することができる。   In addition, since the space between the mounting support portions becomes a space, the weight does not increase, and even when the wavelength-converted light passes through the holding member, it does not hinder the passage of light so much and is suitable for the light emitting device. It becomes. Moreover, when the calorific value of the wavelength conversion member is large, it can be easily handled by slightly increasing the diameter of the mounting support part or increasing the number of mounting support parts.

また、本発明では、上記構成の保持部材が伝熱異方性材料から成り、前記取付支持部の方向を伝熱異方性材料の熱伝導性の高い方向に合致させたことを特徴としている。これによると、保持部に伝えられた波長変換部材の熱は、保持部から、取付支持部の突出方向に速やかに伝熱され、突出方向とは直交する方向には熱が伝わりにくくなる。従って、取付支持部の部分で空気が暖められることによる通過する光のゆらぎを少なくすることができる。   In the present invention, the holding member having the above-described structure is made of a heat transfer anisotropic material, and the direction of the mounting support portion is matched with the direction of high heat conductivity of the heat transfer anisotropic material. . According to this, the heat of the wavelength conversion member transmitted to the holding portion is quickly transferred from the holding portion in the protruding direction of the mounting support portion, and the heat is hardly transferred in the direction orthogonal to the protruding direction. Therefore, it is possible to reduce the fluctuation of the light passing through the warming of the air at the mounting support portion.

なお、伝熱異方性材料としては、グラファイトを好適に使用することができる。グラファイトの熱伝導率は非常に大きいので、取付支持部の径を細くすることができる。ひいては軽量化が可能で発光装置の軽量化に寄与する。その場合、グラファイトブロックのXY面内で切り出すことにより、取付支持部の突出方向を伝熱異方性材料の熱伝導性の高い方向に合致した保持部材を容易に製造できる。グラファイトは錆などによる経時劣化の影響が少なく、保持部材としての強度も備えるため好適な伝熱異方性材料である。   Note that graphite can be suitably used as the heat transfer anisotropic material. Since the thermal conductivity of graphite is very large, the diameter of the mounting support portion can be reduced. As a result, the weight can be reduced, which contributes to the weight reduction of the light emitting device. In that case, by cutting out in the XY plane of the graphite block, it is possible to easily manufacture a holding member that matches the protruding direction of the mounting support portion with the direction of high thermal conductivity of the heat transfer anisotropic material. Graphite is a suitable heat transfer anisotropic material because it is less affected by aging due to rust and the like and has strength as a holding member.

また、本発明の波長変換部材の放熱構造は、上記の保持部材の取付支持部の端部を、放熱部材に熱的に接合したことを特徴としている。この放熱構造によると、波長変換部材で発生した熱は、保持部材の保持部で吸熱され、取付支持部を伝熱し、放熱部材で放熱される。つまり、保持部材が熱伝導部材の機能を兼ねるので、熱伝導部材が保持部材とは別体で構成されたものに比べて、波長変換部材の放熱構造を簡素化することができる。   Moreover, the heat dissipation structure for a wavelength conversion member of the present invention is characterized in that the end portion of the mounting support portion of the holding member is thermally joined to the heat dissipation member. According to this heat dissipation structure, the heat generated by the wavelength conversion member is absorbed by the holding portion of the holding member, is transferred to the mounting support portion, and is radiated by the heat dissipation member. That is, since the holding member also functions as a heat conducting member, the heat dissipation structure of the wavelength conversion member can be simplified as compared with the heat conducting member configured separately from the holding member.

そして、上記の放熱構造を有する本発明の発光装置は、波長変換部材が放射する光を外部の所定方向に出射する反射部材を備えており、前記放熱部材として、前記反射部材を用いたことを特徴としている。これによると、保持部材の取付支持部は反射部材に熱的に接合される。つまり、反射部材が放熱部材を兼ねるので、反射部材とは別に放熱部材を用意する場合に比べてコスト削減が図られる。また、反射部材は広い面積を有するので、放熱面積が大きく効率が良い。   The light emitting device of the present invention having the above heat dissipation structure includes a reflective member that emits light emitted from the wavelength conversion member in a predetermined external direction, and the reflective member is used as the heat dissipation member. It is a feature. According to this, the attachment support part of the holding member is thermally joined to the reflecting member. That is, since the reflecting member also serves as the heat radiating member, the cost can be reduced as compared with the case where the heat radiating member is prepared separately from the reflecting member. Moreover, since the reflecting member has a large area, the heat radiation area is large and the efficiency is good.

また、上記の放熱構造を有する本発明の発光装置は、波長変換部材が放射する光を外部の所定方向に出射する反射部材を備えており、前記放熱部材は、前記反射部材の外周形状に合致する放熱リングとし、反射部材の外周に固定したことを特徴としている。これによると、反射部材が放熱部材の固定用の部材を兼ねるので、放熱部材の固定構造を簡素化することができる。しかも、放熱部材である放熱リングは反射部材の外周に整合するので、発光装置のデザイン性を悪くすることがない。   Further, the light emitting device of the present invention having the above heat dissipation structure includes a reflection member that emits light emitted from the wavelength conversion member in a predetermined external direction, and the heat dissipation member matches the outer peripheral shape of the reflection member. The heat dissipating ring is fixed to the outer periphery of the reflecting member. According to this, since the reflecting member also serves as a member for fixing the heat radiating member, the structure for fixing the heat radiating member can be simplified. In addition, since the heat dissipating ring as the heat dissipating member is aligned with the outer periphery of the reflecting member, the design of the light emitting device is not deteriorated.

この場合、前記波長変換部材を保持した前記保持部材を前記放熱リングに圧入することで、取付支持部の端部を容易に放熱部材に熱的に接合することができる。   In this case, the end of the mounting support portion can be easily thermally bonded to the heat dissipation member by press-fitting the holding member holding the wavelength conversion member into the heat dissipation ring.

なお、上記のように反射部材を備える本発明の発光装置では、波長変換部材の外側方向(周囲)には保持部材の複数の取付支持部が突出しており、反射部材により出射された光は一部取付支持部に遮光され、出射光の輝度が幾分犠牲になることが考えられる。しかし、取付支持部の機能を発揮できる必要最小限の数や太さに設定し、隣接する取付支持部のなす角を均等な中心角(取付支持部が3本の場合は中心角120°)に設定しておけば、発光装置としての出射光の輝度は十分確保できる。   In the light emitting device of the present invention having the reflecting member as described above, a plurality of mounting support portions of the holding member protrude in the outer direction (periphery) of the wavelength conversion member, and the light emitted by the reflecting member is one. It is conceivable that the brightness of the emitted light is somewhat sacrificed by being shielded by the part mounting support part. However, it is set to the minimum number and thickness necessary to exhibit the function of the mounting support part, and the angle formed by the adjacent mounting support parts is a uniform central angle (in the case of three mounting support parts, the central angle is 120 °). If set to, the luminance of the emitted light as the light emitting device can be sufficiently secured.

また、本発明の発光装置は、上記構成の発光装置において、前記波長変換部材は、前記反射部材の中央部から出射するレーザ光が背面に照射されることを特徴としている。これによると、反射部材8からの光の出射効率を最大となり、発光装置としての性能が良くなる。   Moreover, the light emitting device of the present invention is characterized in that, in the light emitting device configured as described above, the wavelength converting member is irradiated with a laser beam emitted from a central portion of the reflecting member. According to this, the light emission efficiency from the reflecting member 8 is maximized, and the performance as a light emitting device is improved.

前記反射部材の反射面は放物面であり、前記反射部材の放物面の焦点位置に、前記保持部材により前記波長変換部材を保持した。これによると、波長変換部材から出射される光は反射部材で平行光として反射されるため、発光装置を前照灯として利用することができる。   The reflection surface of the reflection member is a paraboloid, and the wavelength conversion member is held by the holding member at a focal position of the paraboloid of the reflection member. According to this, since the light emitted from the wavelength conversion member is reflected as parallel light by the reflecting member, the light emitting device can be used as a headlamp.

本発明によると、保持部材の保持部と取付支持部とが良熱伝導材料により一体に形成されているので、波長変換部材で発生した熱は、保持部に直接伝達され、一体に形成した取付支持部内を伝熱するので、熱伝導部材が保持部材とは別体で構成されたものに比べて、構造が簡単な上、放熱効率が向上する。従って、波長変換部材の大部分に放熱用の部材を接合する必要がなく、最低限の面積を接合面とすれば良いので、小さい発光点を実現する場合に好適となる。   According to the present invention, since the holding portion of the holding member and the mounting support portion are integrally formed of a good heat conductive material, the heat generated by the wavelength conversion member is directly transmitted to the holding portion and is integrally formed. Since heat is transferred in the support portion, the structure is simple and the heat dissipation efficiency is improved as compared with the case where the heat conducting member is formed separately from the holding member. Therefore, it is not necessary to join a heat radiating member to most of the wavelength conversion member, and a minimum area may be used as the joining surface, which is suitable for realizing a small light emitting point.

また、前記取付支持部をもって、放熱部材に取り付けた場合には、波長変換部材を所定場所に位置させると同時にこの波長変換部材の放熱構造が得られ、前記取付支持部を介して効果的な放熱を行うことが出来る。   In addition, when the mounting support portion is attached to the heat radiating member, the wavelength conversion member is positioned at a predetermined place, and at the same time, a heat radiating structure of the wavelength conversion member is obtained, and effective heat dissipation is achieved via the mounting support portion. Can be done.

しかも、取付支持部間は空間となるので、重量が重く成らず、波長変換された光が保持部材を通過する構造とした場合でもにあまり光の通過の妨げにならず、発光装置にも好適となる。また、波長変換部材の発熱量が大きい場合には、取付支持部の径を少し太くしたり、取付支持部の数を増やすことにより、容易に対応することができる。   In addition, since the space between the mounting support portions becomes a space, the weight does not increase, and even when the wavelength-converted light passes through the holding member, it does not hinder the passage of light so much and is suitable for the light emitting device. It becomes. Moreover, when the calorific value of the wavelength conversion member is large, it can be easily handled by slightly increasing the diameter of the mounting support part or increasing the number of mounting support parts.

本発明の一実施形態による発光装置を用いた照明装置の構造を概略的に示した図である。It is the figure which showed schematically the structure of the illuminating device using the light-emitting device by one Embodiment of this invention. 図1に示した本発明の一実施形態による発光装置の半導体レーザ装置の構造を示した断面図である。It is sectional drawing which showed the structure of the semiconductor laser apparatus of the light-emitting device by one Embodiment of this invention shown in FIG. 図1に示した本発明の一実施形態による発光装置の半導体レーザ装置および放熱部材の構造を示した断面図である。It is sectional drawing which showed the structure of the semiconductor laser apparatus and heat radiating member of the light-emitting device by one Embodiment of this invention shown in FIG. 図1に示した本発明の一実施形態による発光装置の波長変換部材と光ファイバの位置関係を示した断面図である。It is sectional drawing which showed the positional relationship of the wavelength conversion member and optical fiber of the light-emitting device by one Embodiment of this invention shown in FIG. 図1に示した本発明の一実施形態による発光装置の放熱部材の構造を示した断面図である。It is sectional drawing which showed the structure of the heat radiating member of the light-emitting device by one Embodiment of this invention shown in FIG. 本発明の第1変形例による発光装置の波長変換部材周辺の構造を示した断面図である。It is sectional drawing which showed the structure of the wavelength conversion member periphery of the light-emitting device by the 1st modification of this invention. 本発明の第2変形例による発光装置の波長変換部材周辺の構造を示した断面図である。It is sectional drawing which showed the structure of the wavelength conversion member periphery of the light-emitting device by the 2nd modification of this invention. 本発明の第3変形例による発光装置の波長変換部材周辺の構造を示した断面図である。It is sectional drawing which showed the structure of the wavelength conversion member periphery of the light-emitting device by the 3rd modification of this invention. 本発明の第4変形例による発光装置の波長変換部材周辺の構造を示した断面図である。It is sectional drawing which showed the structure of the wavelength conversion member periphery of the light-emitting device by the 4th modification of this invention.

以下に本発明の実施形態を図面を参照して説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図1〜図5を参照して、本発明の一実施形態による発光装置の構造について説明する。   With reference to FIGS. 1-5, the structure of the light-emitting device by one Embodiment of this invention is demonstrated.

本発明の一実施形態による発光装置1は、図1に示すように、半導体レーザ素子2a(図2参照)を含む半導体レーザ装置2と、半導体レーザ装置2(半導体レーザ素子2a)で発生した熱を放熱するための放熱部材3と、半導体レーザ素子2aから出射(発振)された光を導光する光ファイバ4と、光ファイバ4により導光された光が照射される波長変換部材5と、波長変換部材5を保持するとともに波長変換部材で発生する熱を放熱するための保持部材6と、保持部材6の熱を放熱するための放熱部材7とを備えている。反射部材8は、波長変換部材5により変換された光を特定方向に反射する凹部8aを有するもので、例えば金属製の放物面鏡である。また、反射部材8の焦点位置に波長変換部材5が配置されている。この発光装置1は、例えば、車両用前照灯などに用いられる。   As shown in FIG. 1, a light emitting device 1 according to an embodiment of the present invention includes a semiconductor laser device 2 including a semiconductor laser element 2a (see FIG. 2) and heat generated in the semiconductor laser device 2 (semiconductor laser element 2a). A heat radiating member 3 for radiating heat, an optical fiber 4 for guiding light emitted (oscillated) from the semiconductor laser element 2a, a wavelength converting member 5 to which light guided by the optical fiber 4 is irradiated, A holding member 6 for holding the wavelength conversion member 5 and radiating heat generated by the wavelength conversion member, and a heat radiating member 7 for radiating heat of the holding member 6 are provided. The reflection member 8 has a concave portion 8a that reflects light converted by the wavelength conversion member 5 in a specific direction, and is, for example, a metal parabolic mirror. Further, the wavelength conversion member 5 is disposed at the focal position of the reflection member 8. The light emitting device 1 is used, for example, for a vehicle headlamp.

半導体レーザ装置2は、図2に示すように、光源として機能する半導体レーザ素子2aと、半導体レーザ素子2aが搭載されるステム2bと、ステム2bに固定された2つの外部端子2cと、ステム2b上に取り付けられた金属製の円筒部2dと、半導体レーザ素子2aから出射された光(レーザ光)を集光する集光レンズ2eと、円筒部2dの開口部に取り付けられた蓋部材2fとによって構成されている。   As shown in FIG. 2, the semiconductor laser device 2 includes a semiconductor laser element 2a functioning as a light source, a stem 2b on which the semiconductor laser element 2a is mounted, two external terminals 2c fixed to the stem 2b, and a stem 2b. A metal cylindrical portion 2d attached on top, a condensing lens 2e for condensing light (laser light) emitted from the semiconductor laser element 2a, and a lid member 2f attached to the opening of the cylindrical portion 2d It is constituted by.

半導体レーザ素子2aの裏面は、導電性を有する接着剤(図示せず)により、ステム2bに固定されている。そして、半導体レーザ素子2aの裏面は、導電性を有する接着剤(図示せず)を介して、一方の外部端子2cに電気的に接続されている。また、半導体レーザ素子2aの上面は、金属線(図示せず)を介して、他方の外部端子2cに電気的に接続されている。   The back surface of the semiconductor laser element 2a is fixed to the stem 2b with a conductive adhesive (not shown). The back surface of the semiconductor laser element 2a is electrically connected to one external terminal 2c via a conductive adhesive (not shown). The upper surface of the semiconductor laser element 2a is electrically connected to the other external terminal 2c through a metal wire (not shown).

また、半導体レーザ素子2aは、例えば約450nm以下の波長を有する光(レーザ光)を発振する。具体的には、半導体レーザ素子2aは、例えば青色光、青紫色光または紫外光のレーザ光を発振する機能を有する。なお、青色光のレーザ光は、約450nmの中心波長を有するレーザ光であり、青紫色光のレーザ光は、約405nmの中心波長を有するレーザ光である。また、紫外光のレーザ光は、約10nm以上約380nm(約360nm〜約400nm)以下のいずれかに中心波長を有するレーザ光である。   The semiconductor laser element 2a oscillates light (laser light) having a wavelength of about 450 nm or less, for example. Specifically, the semiconductor laser element 2a has a function of oscillating, for example, blue light, blue violet light, or ultraviolet laser light. The blue laser beam is a laser beam having a center wavelength of about 450 nm, and the blue-violet laser beam is a laser beam having a center wavelength of about 405 nm. Further, the ultraviolet laser beam is a laser beam having a central wavelength in the range of about 10 nm to about 380 nm (about 360 nm to about 400 nm).

ステム2bは、円筒部2dよりも大きい直径(外径)を有する。また、ステム2bは図3に示すように、金属板9と放熱部材3とに挟み込まれた状態で、ネジ20を用いて、放熱部材3に固定されている。また、外部端子2c(図2参照)は、放熱部材3の端子ソケット(図示せず)に挿入されている。   The stem 2b has a larger diameter (outer diameter) than the cylindrical portion 2d. Further, as shown in FIG. 3, the stem 2 b is fixed to the heat radiating member 3 using screws 20 while being sandwiched between the metal plate 9 and the heat radiating member 3. The external terminal 2c (see FIG. 2) is inserted into a terminal socket (not shown) of the heat radiating member 3.

このような構造においては、ステム2bと放熱部材3との間に、放熱グリース(図示せず)を塗布しておいてもよい。このように構成すれば、半導体レーザ装置2(半導体レーザ素子2a)の放熱性をより向上させることが可能である。   In such a structure, heat radiation grease (not shown) may be applied between the stem 2 b and the heat radiation member 3. If comprised in this way, it is possible to improve the heat dissipation of the semiconductor laser apparatus 2 (semiconductor laser element 2a) more.

また、放熱部材3は、例えば、放熱フィン、放熱板(放熱ブロック)およびペルチェ素子などを用いてもよい。   Moreover, the heat radiating member 3 may use, for example, a heat radiating fin, a heat radiating plate (heat radiating block), a Peltier element, or the like.

集光レンズ2eは、半導体レーザ素子2aから出射された光(レーザ光)を光ファイバ4の光入力端面4aに集光する機能を有する形状であればよい。すなわち、集光レンズ2eは、例えば、両面(光入射面および光出射面)が凸状であってもよいし、片面(光入射面または光出射面)のみが凸状であってもよい。なお、集光レンズ2eを設けることによって、半導体レーザ素子2aから出射される光の利用効率を向上させることが可能である。   The condensing lens 2 e may have a shape having a function of condensing light (laser light) emitted from the semiconductor laser element 2 a onto the light input end face 4 a of the optical fiber 4. That is, for example, the condensing lens 2e may be convex on both surfaces (light incident surface and light emitting surface), or only one surface (light incident surface or light emitting surface) may be convex. In addition, by using the condensing lens 2e, it is possible to improve the utilization efficiency of the light emitted from the semiconductor laser element 2a.

また、集光レンズ2eは、半導体レーザ素子2aおよび光ファイバ4から離れた状態で配置してもよいし、半導体レーザ素子2aまたは光ファイバ4に接触するように配置してもよい。   Further, the condenser lens 2e may be disposed in a state of being separated from the semiconductor laser element 2a and the optical fiber 4, or may be disposed so as to contact the semiconductor laser element 2a or the optical fiber 4.

蓋部材2fには、光ファイバ4が挿入される挿入孔2gが形成されている。そして、蓋部材2fにより、光ファイバ4の光入射端面4a側の部分が保持されている。   An insertion hole 2g into which the optical fiber 4 is inserted is formed in the lid member 2f. The portion on the light incident end face 4a side of the optical fiber 4 is held by the lid member 2f.

なお、図2および図3に示した光ファイバ4の半導体レーザ装置2に対する取付構造は、ピグテイル型と呼ばれる構造であり、光ファイバ4と半導体レーザ装置2とが一体的に形成されている。   The attachment structure of the optical fiber 4 to the semiconductor laser device 2 shown in FIGS. 2 and 3 is a structure called a pigtail type, and the optical fiber 4 and the semiconductor laser device 2 are integrally formed.

図1に示すように、光ファイバ4は、例えばプラスチックなどにより形成されており、湾曲可能である。なお、光ファイバ4は、例えば石英ガラスを用いて形成されていてもよい。また、光ファイバ4は、例えば、約0.2mm〜約1.0mmの直径(D1)(図2参照)を有する。   As shown in FIG. 1, the optical fiber 4 is formed of, for example, plastic and can be bent. The optical fiber 4 may be formed using, for example, quartz glass. The optical fiber 4 has a diameter (D1) (see FIG. 2) of about 0.2 mm to about 1.0 mm, for example.

また、光ファイバ4は、図2に示すように、中心部に配置されるコア4bと、コア4bの周囲を覆うクラッド4cと、クラッド4cの周囲を覆う被覆層4dとによって構成されている。   As shown in FIG. 2, the optical fiber 4 includes a core 4b disposed at the center, a clad 4c covering the periphery of the core 4b, and a coating layer 4d covering the periphery of the clad 4c.

波長変換部材5は、図4に示すように、光ファイバ4の光出射端面4eが臨設している。波長変換部材5は、光ファイバ4の直径(D1)よりも大きな直径(D2)を有する、例えば円柱形状に形成されている。また、波長変換部材5は、光出射端面4eから出射された光(レーザ光)が背面の略中央部分から略直角に照射する位置に配置されている。なお、臨設には、光出射面4eが波長変換部材5と接して設けられる構成も含まれる。   As shown in FIG. 4, the wavelength conversion member 5 is provided with a light emission end face 4 e of the optical fiber 4. The wavelength conversion member 5 has a diameter (D2) larger than the diameter (D1) of the optical fiber 4, for example, is formed in a cylindrical shape. Further, the wavelength conversion member 5 is disposed at a position where light (laser light) emitted from the light emitting end face 4e is irradiated at a substantially right angle from a substantially central portion on the back surface. The temporary installation includes a configuration in which the light emitting surface 4 e is provided in contact with the wavelength conversion member 5.

保持部材6は、図1および図5に示すように、波長変換部材5を保持する保持部6aと、保持部6aから、レーザ光の照射光軸の外周方向に突設された複数の取付支持部6bとを有し、保持部6aと取付支持部6bとが良熱伝導材料(本実施形態では、後述するように伝熱異方性材料)により一体に形成されたものである。本実施形態では、レーザ光の照射光軸は、光ファイバ4の光出射端面4eの中心を通って該面4eに直交する線となり、その外周方向は波長変換部材5の軸線を中心とした放射方向となる。   As shown in FIGS. 1 and 5, the holding member 6 includes a holding portion 6 a that holds the wavelength conversion member 5, and a plurality of attachment supports that protrude from the holding portion 6 a in the outer peripheral direction of the laser light irradiation optical axis. The holding portion 6a and the mounting support portion 6b are integrally formed of a good heat conductive material (in this embodiment, a heat transfer anisotropic material as will be described later). In this embodiment, the irradiation optical axis of the laser light passes through the center of the light emitting end surface 4e of the optical fiber 4 and becomes a line orthogonal to the surface 4e, and the outer peripheral direction is a radiation centered on the axis of the wavelength conversion member 5 Direction.

保持部6aは、波長変換部材5の直径(D2)とほぼ同じ内径を有する、例えば円筒形状に形成されている。保持部6aの内周に、波長変換部材5が嵌着されている。波長変換部材5の光ファイバ4側は、光照射領域Sに近く発熱が激しいので、少なくともこの部分の近傍の外周部が覆われるように保持部6aを配置するのが放熱効率の面で好ましい。保持部6aの長さは、波長変換部材5から放出される光が大幅に減殺されないように、波長変換部材5の長さよりも短く設定する必要がある。保持部6aの厚みは、吸熱量と材料コストを考慮して適当な寸法に選ばれる。   The holding portion 6a is formed in, for example, a cylindrical shape having an inner diameter substantially the same as the diameter (D2) of the wavelength conversion member 5. The wavelength conversion member 5 is fitted on the inner periphery of the holding portion 6a. The optical fiber 4 side of the wavelength conversion member 5 is close to the light irradiation region S and generates a lot of heat. Therefore, it is preferable in terms of heat dissipation efficiency to arrange the holding portion 6a so that at least the outer peripheral portion in the vicinity of this portion is covered. The length of the holding portion 6a needs to be set shorter than the length of the wavelength conversion member 5 so that the light emitted from the wavelength conversion member 5 is not significantly diminished. The thickness of the holding part 6a is selected to an appropriate dimension in consideration of the amount of heat absorption and the material cost.

取付支持部6bは、例えば、角棒状であり、図5に示すように、保持部6bの中心を中心として放射状に3本突設されている。隣接する取付支持部6b、6bのなす角は均等な中心角の120°に設定されている。よって、取付支持部6b、6b間は空間となる。   The attachment support portion 6b has, for example, a rectangular bar shape, and three protrusions are provided radially from the center of the holding portion 6b as shown in FIG. The angle formed by the adjacent mounting support portions 6b, 6b is set to an equal central angle of 120 °. Therefore, a space is provided between the attachment support portions 6b and 6b.

本実施形態では、保持部材6の材料である良熱伝導材料として、グラファイトなどの伝熱異方性材料を用いている。次の表1は、伝熱異方性材料の一例であるグラファイト、非熱伝導材料の一例であるシリコーンラバー、等法的な熱伝導性を示す良熱伝導材料の一例である銅、アルミニウムの熱伝導率の値を示すものである。表1に示すように、グラファイトは、xy方向に関しては良熱伝導材料の代表である銅、アルミニウムなどの金属よりも1桁大きい極めて高い熱伝導率を示す一方、z方向に関しては非熱伝導材料の代表であるシリコーンラバーに匹敵するほど小さな熱伝導率を有し、熱伝導率の方向依存性が高い材料であることが理解される。   In the present embodiment, a heat transfer anisotropic material such as graphite is used as the good heat conductive material that is the material of the holding member 6. The following Table 1 shows an example of graphite, which is an example of a heat transfer anisotropic material, silicone rubber, which is an example of a non-thermal conductive material, copper, aluminum, which is an example of a good heat conductive material showing legal thermal conductivity. The value of thermal conductivity is shown. As shown in Table 1, graphite exhibits extremely high thermal conductivity that is an order of magnitude higher than that of metals such as copper and aluminum, which are representative of good heat conductive materials, in the xy direction, while non-heat conductive material in the z direction. It is understood that this is a material having a low thermal conductivity comparable to that of silicone rubber, which is representative of the above, and having a high direction dependency of the thermal conductivity.

Figure 2011054759
Figure 2011054759

保持部材6の材料として伝熱異方性材料を用いる場合は、取付支持部6bの突出方向を伝熱異方性材料の熱伝導性の高い方向に合致させるようにすると、保持部6aに伝えられた波長変換部材5の熱は、保持部6aから、取付支持部6bの突出方向に速やかに伝熱され、突出方向とは直交する方向には熱が伝わりにくくなる。従って、取付支持部の部分で空気が暖められることによる通過する光のゆらぎを少なくすることができる。   When a heat transfer anisotropic material is used as the material of the holding member 6, if the protruding direction of the mounting support portion 6b is matched with the direction of high heat conductivity of the heat transfer anisotropic material, the heat transfer anisotropic material is transmitted to the holding portion 6a. The heat of the obtained wavelength conversion member 5 is quickly transferred from the holding portion 6a to the protruding direction of the mounting support portion 6b, and the heat is hardly transferred in the direction orthogonal to the protruding direction. Therefore, it is possible to reduce the fluctuation of the light passing through the warming of the air at the mounting support portion.

グラファイトの熱伝導率は非常に大きいので、取付支持部の径を細くすることができる。ひいては軽量化が可能で発光装置の軽量化に寄与する。その場合、グラファイトブロックのXY面内で切り出すことにより、取付支持部6bの突出方向を伝熱異方性材料の熱伝導性の高い方向に合致した保持部材6を容易に製造できる。グラファイトは錆などによる経時劣化の影響が少なく、保持部材としての強度も備えるため好適な伝熱異方性材料である。伝熱異方性材料としては、グラファイトの他、例えば、水晶のように、六方晶系の結晶構造を有する材料を使用することができる。   Since the thermal conductivity of graphite is very large, the diameter of the mounting support portion can be reduced. As a result, the weight can be reduced, which contributes to the weight reduction of the light emitting device. In that case, by cutting out in the XY plane of the graphite block, it is possible to easily manufacture the holding member 6 in which the protruding direction of the mounting support portion 6b matches the direction of high heat conductivity of the heat transfer anisotropic material. Graphite is a suitable heat transfer anisotropic material because it is less affected by aging due to rust and the like and has strength as a holding member. As the heat transfer anisotropic material, in addition to graphite, a material having a hexagonal crystal structure such as quartz can be used.

放熱部材7は、図1に示すように、反射部材8の外周形状に合致する放熱リングであり、反射部材8の外周に固定されている。具体的には、放熱部材7の一端にはボルト孔を有するフランジ7aが形成されており、フランジ7aに対応して反射部材8の外周に形成されたボルト孔を有するフランジ8cが合わされ、ボルト21とナット22で締結される。これによると、反射部材8が放熱部材7の固定用の部材を兼ねるので、放熱部材7の固定構造を簡素化することができる。しかも、放熱部材7である放熱リングは反射部材8の外周に整合するので、発光装置1のデザイン性を悪くすることがない。   As shown in FIG. 1, the heat dissipating member 7 is a heat dissipating ring that matches the outer peripheral shape of the reflecting member 8, and is fixed to the outer periphery of the reflecting member 8. Specifically, a flange 7a having a bolt hole is formed at one end of the heat radiating member 7, and a flange 8c having a bolt hole formed on the outer periphery of the reflecting member 8 corresponding to the flange 7a is combined. And a nut 22. According to this, since the reflecting member 8 also serves as a member for fixing the heat radiating member 7, the fixing structure of the heat radiating member 7 can be simplified. Moreover, since the heat dissipation ring as the heat dissipation member 7 is aligned with the outer periphery of the reflection member 8, the design of the light emitting device 1 is not deteriorated.

保持部材6の3本の取付支持部6bの突出方向の長さは等しい長さに設定されている。つまり、3本の取付支持部6bの端は、保持部6aの中心を中心とする同一円周上に位置する。この円の直径は、放熱部材(放熱リング)7の内周の直径(D3)と同程度か若干大きい寸法に設定されている。よって、波長変換部材5を保持部6aに保持した保持部材6を放熱部材7に圧入するだけで、取付支持部6bの端部を容易に放熱部材7に熱的に接合することができる。   The length of the three attachment support portions 6b of the holding member 6 in the protruding direction is set to be equal. That is, the ends of the three attachment support portions 6b are located on the same circumference with the center of the holding portion 6a as the center. The diameter of this circle is set to a size that is the same as or slightly larger than the diameter (D3) of the inner periphery of the heat radiating member (heat radiating ring) 7. Therefore, the end portion of the mounting support portion 6b can be easily thermally bonded to the heat radiating member 7 simply by press-fitting the holding member 6 holding the wavelength conversion member 5 to the holding portion 6a into the heat radiating member 7.

波長変換部材5は、半導体レーザ素子2aから出射された光ファイバ4により導光された光(レーザ光)の少なくとも一部を、異なる波長を有する光に変換し出射(発光)する機能を有する。具体的には、波長変換部材5は、半導体レーザ素子2aからの光の一部を、黄色光や、青色光、赤色光および緑色光などに変換し出射する機能を有する。そして、波長変換部材5から出射される光が混色されることによって、例えば白色光が得られる。   The wavelength converting member 5 has a function of converting at least part of light (laser light) guided by the optical fiber 4 emitted from the semiconductor laser element 2a into light having a different wavelength and emitting (emitting) light. Specifically, the wavelength conversion member 5 has a function of converting a part of the light from the semiconductor laser element 2a into yellow light, blue light, red light, green light, and the like and emitting the light. And the light radiate | emitted from the wavelength conversion member 5 is mixed, for example, white light is obtained.

このような波長変換部材5は、例えば、透光性部材と、透光性部材内に分散された粒子状の蛍光体とにより形成することが可能である。この透光性部材は、例えば樹脂により形成してもよい。   Such a wavelength conversion member 5 can be formed of, for example, a translucent member and a particulate phosphor dispersed in the translucent member. This translucent member may be formed of a resin, for example.

また、蛍光体は、半導体レーザ素子2aからの光の少なくとも一部を異なる波長を有する光に変換することが可能であれば特に限定されないが、サイアロンなどの酸窒化物系の材料により形成することが好ましい。蛍光体をサイアロンなどの酸窒化物系の材料により形成すれば、蛍光体(波長変換部材5)の耐熱性を向上させることが可能であるので、蛍光体(波長変換部材5)が熱により劣化(変色や変形)するのを抑制することが可能である。   The phosphor is not particularly limited as long as at least a part of the light from the semiconductor laser element 2a can be converted into light having a different wavelength. However, the phosphor is formed of an oxynitride material such as sialon. Is preferred. If the phosphor is formed of an oxynitride material such as sialon, it is possible to improve the heat resistance of the phosphor (wavelength conversion member 5), so that the phosphor (wavelength conversion member 5) is deteriorated by heat. It is possible to suppress (discoloration or deformation).

蛍光体の別の好適な例としては、III−V族の化合物半導体からなるナノメータサイズの粒子を用いた半導体ナノ粒子蛍光体を用いることもできる。同一の化合物半導体(例えばインジウムリン:InP)を用いても、その粒子径を変更させることにより、量子サイズ効果によって発光色を変化させうることが半導体ナノ粒子蛍光体の特徴の一つである。なお、照射する光の波長は、当該半導体ナノ粒子蛍光体の吸収のピーク波長よりも短ければ良いので、上記青紫光に限られず紫外光でも良い。また、赤色に発光する半導体ナノ粒子蛍光体に対しては、青色光でも緑色光でも良い。   As another suitable example of the phosphor, a semiconductor nanoparticle phosphor using nanometer-sized particles made of a III-V compound semiconductor can also be used. One feature of the semiconductor nanoparticle phosphor is that even when the same compound semiconductor (for example, indium phosphide: InP) is used, the emission color can be changed by the quantum size effect by changing the particle diameter. In addition, since the wavelength of the light to irradiate should just be shorter than the absorption peak wavelength of the said semiconductor nanoparticle fluorescent substance, it is not restricted to the said blue-violet light, An ultraviolet light may be sufficient. For semiconductor nanoparticle phosphors that emit red light, blue light or green light may be used.

また、半導体ナノ粒子蛍光体は、半導体ベースであるので蛍光寿命が短く、励起光のパワーを素早く蛍光として放射できるのでハイパワーの励起光に対して耐性が強いという特徴もある。これは、上記半導体ナノ粒子蛍光体の発光寿命が、10ナノ秒程度であり、希土類を発光中心とする通常の蛍光体材料の発光寿命に比べて5桁も小さいためである。発光寿命が短いため、励起光の吸収と蛍光の発光とを素早く繰り返すことができる。その結果、強い励起光に対して高い変換効率を保つことができ、蛍光体からの発熱が低減される。よって、波長変換部材5が熱により劣化(変色や変形)するのをより抑制することができる。これにより、光の出力が高い半導体レーザ素子2aを光源として用いる場合に、発光装置1の寿命が短くなるのをより抑制することができる。   In addition, since the semiconductor nanoparticle phosphor is semiconductor-based, it has a short fluorescence lifetime and can emit the excitation light power quickly as fluorescence, and thus has a feature of high resistance to high-power excitation light. This is because the emission lifetime of the semiconductor nanoparticle phosphor is about 10 nanoseconds, which is five orders of magnitude shorter than the emission lifetime of a normal phosphor material having a rare earth-based emission center. Since the emission lifetime is short, absorption of excitation light and emission of fluorescence can be repeated quickly. As a result, high conversion efficiency can be maintained for strong excitation light, and heat generation from the phosphor is reduced. Therefore, it is possible to further suppress the wavelength conversion member 5 from being deteriorated (discolored or deformed) by heat. Thereby, when using the semiconductor laser element 2a with a high light output as a light source, it can suppress more that the lifetime of the light-emitting device 1 becomes short.

上記のような発光装置1では、波長変換部材5の光照射領域Sで発生した熱は、光照射領域S近傍周囲から保持部材6の保持部6aに伝達される。そして、その熱が取付支持部6bを伝わって放熱部材7に伝達され、放熱される。これによって、波長変換部材5で発生した熱は、継続的に放熱される。すなわち、波長変換部材5で発生した熱を放熱することができる。   In the light emitting device 1 as described above, the heat generated in the light irradiation region S of the wavelength conversion member 5 is transmitted from the vicinity of the light irradiation region S to the holding portion 6 a of the holding member 6. Then, the heat is transmitted to the heat radiating member 7 through the mounting support portion 6b and radiated. Thereby, the heat generated in the wavelength conversion member 5 is continuously dissipated. That is, the heat generated in the wavelength conversion member 5 can be radiated.

図1に示すように、反射部材8の凹部8aの反射面(内面)は、光を反射する機能を有する鏡面に形成されている。また、反射部材8の凹部8aの反射面は、例えば、放物面であてもよいし、楕円面の一部であってもよい。また、凹部8aの反射面は、上下方向や左右方向に非対称な面であってもよい。なお、反射部材8の凹部8aの反射面(内面)は、光を反射する機能を有していれば、鏡面でなくてもよい。   As shown in FIG. 1, the reflecting surface (inner surface) of the recess 8a of the reflecting member 8 is formed as a mirror surface having a function of reflecting light. Further, the reflecting surface of the concave portion 8a of the reflecting member 8 may be, for example, a parabolic surface or a part of an elliptical surface. Further, the reflection surface of the recess 8a may be a surface that is asymmetric in the vertical direction and the horizontal direction. Note that the reflection surface (inner surface) of the recess 8a of the reflection member 8 may not be a mirror surface as long as it has a function of reflecting light.

また、反射部材8は、波長変換部材5から放射された光を所定の方向に出射する(反射する)機能を有する。   The reflection member 8 has a function of emitting (reflecting) light emitted from the wavelength conversion member 5 in a predetermined direction.

また、反射部材8の凹部8aの反射面(放物面)の頂点には、光ファイバ4が挿入される挿入孔8bが形成されている。そして、光ファイバ4は、反射部材8の凹部の反射面(放物面)の頂点から反射部材8の凹部8aの内側に突出している。これにより、反射部材8の中央部からレーザ光が波長変換部材5の背面に照射されるので、反射部材8からの光の出射効率を最大にでき、発光装置としての性能が良くなる。反射部材8は、例えば、約30mmの直径を有するように形成されている。   In addition, an insertion hole 8 b into which the optical fiber 4 is inserted is formed at the apex of the reflecting surface (parabolic surface) of the concave portion 8 a of the reflecting member 8. The optical fiber 4 protrudes from the apex of the reflecting surface (parabolic surface) of the concave portion of the reflecting member 8 to the inside of the concave portion 8 a of the reflecting member 8. Thereby, since the laser beam is irradiated to the back surface of the wavelength conversion member 5 from the central part of the reflection member 8, the light emission efficiency from the reflection member 8 can be maximized, and the performance as the light emitting device is improved. The reflecting member 8 is formed to have a diameter of about 30 mm, for example.

また、反射部材8は、放熱性を有するように、金属などにより形成されていてもよいし、表面に金属層が形成された部材により形成されていてもよい。この場合、反射部材8を放熱部材7に固定または接触させることによって、波長変換部材5で発生した熱を、反射部材8からも放熱させることが可能である。   Moreover, the reflecting member 8 may be formed of a metal or the like so as to have heat dissipation properties, or may be formed of a member having a metal layer formed on the surface. In this case, the heat generated in the wavelength conversion member 5 can be dissipated from the reflecting member 8 by fixing or contacting the reflecting member 8 to the heat dissipating member 7.

本発明によると、保持部材の保持部と取付支持部とが良熱伝導材料により一体に形成されているので、波長変換部材で発生した熱は、保持部に直接伝達され、一体に形成した取付支持部内を伝熱するので、熱伝導部材が保持部材とは別体で構成されたものに比べて、構造が簡単な上、放熱効率が向上する。従って、波長変換部材の大部分に放熱用の部材を接合する必要がなく、最低限の面積を接合面とすれば良いので、小さい発光点を実現する場合に好適となる。   According to the present invention, since the holding portion of the holding member and the mounting support portion are integrally formed of a good heat conductive material, the heat generated by the wavelength conversion member is directly transmitted to the holding portion and is integrally formed. Since heat is transferred in the support portion, the structure is simple and the heat dissipation efficiency is improved as compared with the case where the heat conducting member is formed separately from the holding member. Therefore, it is not necessary to join a heat radiating member to most of the wavelength conversion member, and a minimum area may be used as the joining surface, which is suitable for realizing a small light emitting point.

また、前記取付支持部をもって、放熱部材に取り付けた場合には、波長変換部材を所定場所に位置させると同時にこの波長変換部材の放熱構造が得られ、前記取付支持部を介して効果的な放熱を行うことが出来る。   In addition, when the mounting support portion is attached to the heat radiating member, the wavelength conversion member is positioned at a predetermined place, and at the same time, a heat radiating structure of the wavelength conversion member is obtained, and effective heat dissipation is achieved via the mounting support portion. Can be done.

しかも、取付支持部間は空間となるので、重量が重く成らず、波長変換された光が保持部材を通過する構造とした場合でもにあまり光の通過の妨げにならず、発光装置にも好適となる。また、波長変換部材の発熱量が大きい場合には、取付支持部の径を少し太くしたり、取付支持部の数を増やすことにより、容易に対応することができる。   In addition, since the space between the mounting support portions becomes a space, the weight does not increase, and even when the wavelength-converted light passes through the holding member, it does not hinder the passage of light so much and is suitable for the light emitting device. It becomes. Moreover, when the calorific value of the wavelength conversion member is large, it can be easily handled by slightly increasing the diameter of the mounting support part or increasing the number of mounting support parts.

なお、今回開示された実施形態は、全ての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は、上記した実施形態の説明ではなく特許請求の範囲によって示され、さらに特許請求の範囲と均等の意味および範囲内での全ての変更が含まれる。   In addition, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes meanings equivalent to the scope of claims for patent and all modifications within the scope.

例えば、本発明の発光装置は、インジケータランプ(表示灯)、イルミネーション、プロジェクタまたはレーザポインタや、その他の各種発光装置に適用可能である。また、本発明の発光装置は、車両用前照灯以外に、表示装置用のバックライト、室内用照明装置または内視鏡用照明装置や、その他の各種照明装置にも適用可能である。   For example, the light emitting device of the present invention can be applied to an indicator lamp (indicator light), illumination, a projector or a laser pointer, and other various light emitting devices. The light emitting device of the present invention can be applied to a backlight for a display device, an indoor lighting device or an endoscope lighting device, and other various lighting devices in addition to the vehicle headlamp.

また、本発明の発光装置の半導体レーザ素子は、高出力型の半導体レーザ素子であっても、低出力型の半導体レーザ素子であってもよい。   Further, the semiconductor laser element of the light emitting device of the present invention may be a high output type semiconductor laser element or a low output type semiconductor laser element.

また、上記実施形態では、発光素子として半導体レーザ素子を用いた例について示したが、本発明はこれに限らず、発光素子として、半導体レーザ素子以外の、例えば発光ダイオードなどを用いてもよい。   In the above embodiment, an example in which a semiconductor laser element is used as a light emitting element has been described. However, the present invention is not limited to this, and a light emitting element other than the semiconductor laser element, such as a light emitting diode, may be used.

また、上記実施形態では、導光部材として光ファイバを用いた例について示したが、本発明はこれに限らず、光を導光する機能を有していれば、光ファイバ以外の部材を用いてもよい。   Moreover, in the said embodiment, although the example which used the optical fiber as a light guide member was shown, this invention is not restricted to this, As long as it has the function to guide light, it uses members other than an optical fiber. May be.

また、上記実施形態では、発光素子から離れた場所に導光部材(光ファイバ)を用いて導光し波長変換部材5に照射する例について示したが、本発明はこれに限らず、導光部材を用いなくてもよい。例えば、図8に示すように、光反射部材8に設けた透孔8dを通して、発光素子2aから出射されるレーザ光を直接、波長変換部材5に照射するようにしてもよい。   In the above embodiment, an example in which light is guided to a place away from the light emitting element using a light guide member (optical fiber) and irradiated to the wavelength conversion member 5 is shown, but the present invention is not limited to this, and the light guide is provided. It is not necessary to use a member. For example, as shown in FIG. 8, the wavelength conversion member 5 may be directly irradiated with laser light emitted from the light emitting element 2 a through a through hole 8 d provided in the light reflecting member 8.

また、上記実施形態では、保持部材の保持部の内周に、波長変換部材を嵌着する例について示したが、本発明はこれに限らず、導電性接着層を用いて接着してもよい。導電性接着層は、通常、非導電性の接着層に比べて熱伝導率が高いので、波長変換部材で発生した熱を、導電性接着層を介して、より効率よく保持部に伝達させることができる。   Moreover, in the said embodiment, although the example which fits the wavelength conversion member to the inner periphery of the holding | maintenance part of a holding member was shown, this invention is not restricted to this, You may adhere using a conductive contact bonding layer. . Since the conductive adhesive layer usually has higher thermal conductivity than the non-conductive adhesive layer, the heat generated by the wavelength conversion member can be more efficiently transferred to the holding portion via the conductive adhesive layer. Can do.

また、上記実施形態では、保持部材の保持部を円筒形状に形成した例について説明したが、本発明はこれに限らず、円筒形状以外の形状に形成してもよい。例えば、図6に示すように、保持部6aを板状或いは柱状に形成して、その中心に設けた貫通孔に光ファイバ4の光出射側端部を嵌入するとともに、その一側の面に波長変換部材5を導電性接着剤10を用いて接着してもよい。これによると、保持部6aにより、光ファイバ4の光出射側端部も保持されるので、レーザ光の照射位置の精度を高めることができる。或いは、図7に示すように、円筒形状の保持部6aの一端に内向きのフランジを形成し、波長変換部材5をエッジ部分で保持する構成としてもよい。これによると、波長変換部材5の軸方向の位置決めを確実に行えるため、波長変換部材5を反射部材8の焦点位置に精度良く配置することが可能となる。   Moreover, although the said embodiment demonstrated the example which formed the holding part of the holding member in the cylindrical shape, this invention is not restricted to this, You may form in shapes other than a cylindrical shape. For example, as shown in FIG. 6, the holding portion 6 a is formed in a plate shape or a column shape, and the light emitting side end portion of the optical fiber 4 is fitted into a through hole provided in the center thereof, and on one surface thereof. The wavelength conversion member 5 may be bonded using the conductive adhesive 10. According to this, since the light emitting side end portion of the optical fiber 4 is also held by the holding portion 6a, the accuracy of the irradiation position of the laser light can be increased. Or as shown in FIG. 7, it is good also as a structure which forms an inward flange in the end of the cylindrical holding part 6a, and hold | maintains the wavelength conversion member 5 by an edge part. According to this, since the wavelength conversion member 5 can be reliably positioned in the axial direction, the wavelength conversion member 5 can be accurately arranged at the focal position of the reflection member 8.

また、上記実施形態では、保持部材の材料として伝熱異方性材料を用いる場合について説明したが、本発明はこれに限らず、伝熱異方性材料以外の良熱伝導材料を用いてもよい。例えば、良熱伝導材料の代表例である、金、銀、銅、アルミニウム、ステンレスなどの金属材料を用いてもよい。   In the above embodiment, the case where the heat transfer anisotropic material is used as the material of the holding member has been described. However, the present invention is not limited to this, and a good heat conductive material other than the heat transfer anisotropic material may be used. Good. For example, a metal material such as gold, silver, copper, aluminum, stainless steel, which is a representative example of a good heat conductive material, may be used.

また、上記実施形態では、保持部材の取付支持部を角棒状に形成した場合について示したが、本発明はこれに限らず、各棒状以外の形状に形成してもよい。例えば、取付支持部を丸棒状、フィン状などに形成してもよい。   Moreover, although the case where the attachment support part of the holding member was formed in the shape of a square bar was shown in the above embodiment, the present invention is not limited to this and may be formed in a shape other than each bar shape. For example, the attachment support portion may be formed in a round bar shape, a fin shape, or the like.

また、上記実施形態では、保持部材の取付支持部の数を3本とした場合について示したが、本発明はこれに限らず、1本あるいは2本あるいは3本より多い数としてもよい。伝熱効率と強度の面から言えば取付支持部の数は多い方が好ましいが、あまり多いと波長変換部材から放射される光および反射部材からの出射光が大幅に減殺されるため、発光装置としての機能を損なわない範囲の数とするのがよい。   Moreover, although the case where the number of attachment support portions of the holding member is three has been described in the above embodiment, the present invention is not limited to this and may be one, two, or more than three. In terms of heat transfer efficiency and strength, it is preferable to have a large number of mounting support portions. However, if the number is too large, the light emitted from the wavelength conversion member and the light emitted from the reflecting member are greatly diminished. The number should be in a range that does not impair the function.

また、上記実施形態では、図1に示すように、反射部材8とは別に放熱部材7を設ける例について説明したが、本発明はこれに限らず、放熱部材として、反射部材を用いてもよい。例えば、図9に示すように、反射部材8の凹部8aに面した内周に取付支持部6bに対応した溝孔8dを周方向に等間隔で複数設け、溝孔8dに保持部材6の取付支持部6bの端部に嵌合するようにしてもよい。これによると、保持部材6の取付支持部6bは反射部材8に熱的に接合される。つまり、反射部材8が放熱部材を兼ねるので、反射部材8とは別に放熱部材7を用意する場合に比べてコスト削減が図られる。また、反射部材8は広い面積を有するので、放熱面積が大きく効率が良い。   Moreover, in the said embodiment, as shown in FIG. 1, although the example which provides the heat radiating member 7 separately from the reflective member 8 was demonstrated, this invention is not restricted to this, You may use a reflective member as a heat radiating member. . For example, as shown in FIG. 9, a plurality of groove holes 8d corresponding to the attachment support portions 6b are provided at equal intervals in the circumferential direction on the inner periphery facing the recess 8a of the reflecting member 8, and the holding member 6 is attached to the groove hole 8d. You may make it fit in the edge part of the support part 6b. According to this, the attachment support portion 6 b of the holding member 6 is thermally joined to the reflecting member 8. That is, since the reflecting member 8 also serves as the heat radiating member, the cost can be reduced as compared with the case where the heat radiating member 7 is prepared separately from the reflecting member 8. Further, since the reflecting member 8 has a large area, the heat radiation area is large and the efficiency is good.

また、上記実施形態では、波長変換部材を円柱形状に形成した例について示したが、本発明はこれに限らず、波長変換部材を、円柱形状以外の形状に形成してもよい。例えば、波長変換部材を半球形状に形成してもよい。   Moreover, in the said embodiment, although shown about the example which formed the wavelength conversion member in the column shape, this invention is not limited to this, You may form a wavelength conversion member in shapes other than a column shape. For example, the wavelength conversion member may be formed in a hemispherical shape.

また、上記実施形態では、波長変換部材を、透光性部材と、透光性部材内に分散された蛍光体とにより形成した例について示したが、本発明はこれに限らず、波長変換部材を、蛍光体のみにより形成してもよい。   Moreover, in the said embodiment, although the example which formed the wavelength conversion member with the translucent member and the fluorescent substance disperse | distributed in the translucent member was shown, this invention is not limited to this, The wavelength conversion member May be formed of phosphor alone.

また、上記実施形態では、波長変換部材が放熱部材に固定されている場合について示したが、本発明はこれに限らず、波長変換部材は、放熱部材に固定されていなくても当接されていればよい。この場合、波長変換部材を支持する部材を別途設けてもよい。   Moreover, in the said embodiment, although the case where the wavelength conversion member was fixed to the heat radiating member was shown, this invention is not restricted to this, The wavelength conversion member is contact | abutted even if it is not fixed to the heat radiating member. Just do it. In this case, a member that supports the wavelength conversion member may be provided separately.

また、上記実施形態では、波長変換部材が放熱部材のみにより支持されている場合について説明したが、本発明はこれに限らず、波長変換部材や放熱部材を支持する部材を別途設けてもよい。   Moreover, although the said embodiment demonstrated the case where the wavelength conversion member was supported only by the heat radiating member, this invention is not restricted to this, You may provide the member which supports a wavelength conversion member and a heat radiating member separately.

また、上記実施形態では、波長変換部材を、反射部材の凹部内に配置した例について示したが、本発明はこれに限らず、波長変換部材を、反射部材の凹部の外側に配置してもよい。   Moreover, in the said embodiment, although shown about the example which has arrange | positioned the wavelength conversion member in the recessed part of a reflection member, this invention is not limited to this, Even if it arrange | positions a wavelength conversion member in the recessed part of a reflection member. Good.

また、上記実施形態では、波長変換部材の光ファイバ側の面が、例えば平坦面に形成されている例について説明したが、本発明はこれに限らず、波長変換部材の光ファイバ側の面に凹部を設けてもよい。この場合、凹部内に光ファイバの光出射端面が位置するように、光ファイバを配置してもよい。   Moreover, although the said embodiment demonstrated the example in which the surface by the side of the optical fiber of a wavelength conversion member was formed in the flat surface, for example, this invention is not restricted to this, The surface by the side of the optical fiber of a wavelength conversion member A recess may be provided. In this case, the optical fiber may be arranged so that the light emitting end face of the optical fiber is located in the recess.

また、上記実施形態では、光ファイバと半導体レーザ装置とを、ピグテイル型に構成した例について示したが、本発明はこれに限らず、光ファイバと半導体レーザ装置とを、互いに分離可能なコネクタ型(レセプタクル型)に構成してもよい。   Moreover, in the said embodiment, although the example which comprised the optical fiber and the semiconductor laser apparatus in the pigtail type was shown, this invention is not restricted to this, The connector type which can isolate | separate an optical fiber and a semiconductor laser apparatus mutually. You may comprise (receptacle type).

また、上記実施形態では、波長変換部材から出射される光が混色されることによって白色光が得られるように、半導体レーザ素子および波長変換部材を構成する例について示したが、本発明はこれに限らず、白色光以外の光が得られるように、半導体レーザ素子および波長変換部材を構成してもよい。   Moreover, in the said embodiment, although shown about the example which comprises a semiconductor laser element and a wavelength conversion member so that white light can be obtained by mixing the light radiate | emitted from a wavelength conversion member, this invention is shown to this. However, the semiconductor laser element and the wavelength conversion member may be configured so that light other than white light is obtained.

また、上記実施形態では、約450nm以下の波長を有する光(青色光、青紫色光または紫外光のレーザ光)を出射する半導体レーザ素子を用いる例について示したが、本発明はこれに限らず、約450nmよりも大きい波長を有する光(レーザ光)を出射する半導体レーザ素子を用いてもよい。   In the above-described embodiment, an example in which a semiconductor laser element that emits light having a wavelength of about 450 nm or less (blue light, blue-violet light, or ultraviolet laser light) is used has been described, but the present invention is not limited thereto. A semiconductor laser element that emits light (laser light) having a wavelength greater than about 450 nm may be used.

また、上記実施形態では、半導体レーザ素子と光ファイバとの間に、集光レンズを設けた例について示したが、本発明はこれに限らず、半導体レーザ素子と光ファイバとの間に集光レンズを設けなくてもよい。   In the above embodiment, an example in which a condensing lens is provided between the semiconductor laser element and the optical fiber has been described. However, the present invention is not limited to this, and condensing is performed between the semiconductor laser element and the optical fiber. It is not necessary to provide a lens.

また、上記実施形態では、金属板を用いて、半導体レーザ装置を放熱部材に取り付けた例について示したが、本発明はこれに限らず、例えばステムにネジ挿入穴を設け、金属板を用いずに、半導体レーザ装置(ステム)を放熱部材に取り付けてもよい。   Moreover, in the said embodiment, although the example which attached the semiconductor laser apparatus to the heat radiating member using the metal plate was shown, this invention is not restricted to this, For example, a screw insertion hole is provided in a stem and a metal plate is not used. In addition, the semiconductor laser device (stem) may be attached to the heat radiating member.

1 発光装置(照明装置)
2a 半導体レーザ素子(発光素子)
3 放熱部材
4 光ファイバ(導光部材)
5 波長変換部材
6 保持部材
6a 保持部
6b 取付支持部
7 放熱部材
8 反射部材
S 光照射領域
1 Light-emitting device (lighting device)
2a Semiconductor laser element (light emitting element)
3 Heat dissipation member 4 Optical fiber (light guide member)
DESCRIPTION OF SYMBOLS 5 Wavelength conversion member 6 Holding member 6a Holding part 6b Mounting support part 7 Heat radiating member 8 Reflective member S Light irradiation area

Claims (10)

レーザ光の照射を受けて異なる波長の光に変換して放射する波長変換部材を保持する保持部材であって、前記波長変換部材を保持する保持部と、該保持部から、前記レーザ光の照射光軸の外周方向に突出された取付支持部とを有し、前記保持部と前記取付支持部とが良熱伝導材料により一体に形成されたことを特徴とする保持部材。   A holding member for holding a wavelength conversion member that receives and radiates laser light and converts it into light having a different wavelength, the holding portion for holding the wavelength conversion member, and irradiation of the laser light from the holding portion. A holding member having a mounting support portion protruding in an outer peripheral direction of the optical axis, wherein the holding portion and the mounting support portion are integrally formed of a heat-conductive material. 前記保持部材は伝熱異方性材料から成り、前記取付支持部の突出方向を伝熱異方性材料の熱伝導性の高い方向に合致させたことを特徴とする請求項1に記載の保持部材。   The holding member according to claim 1, wherein the holding member is made of a heat transfer anisotropic material, and a protruding direction of the mounting support portion is matched with a direction of high heat conductivity of the heat transfer anisotropic material. Element. 前記伝熱異方性材料がグラファイトであることを特徴とする請求項2に記載の保持部材。   The holding member according to claim 2, wherein the heat transfer anisotropic material is graphite. 請求項3に記載の保持部材の製造方法であって、グラファイトブロックのXY面内で切り出すことを特徴とする保持部材の製造方法。   It is a manufacturing method of the holding member of Claim 3, Comprising: It cuts out within the XY plane of a graphite block, The manufacturing method of the holding member characterized by the above-mentioned. 請求項1〜3のいずれかに記載の保持部材の取付支持部の端部を、放熱部材に熱的に接合したことを特徴とする波長変換部材の放熱構造。   A heat dissipation structure for a wavelength conversion member, wherein an end of the mounting support portion of the holding member according to claim 1 is thermally bonded to the heat dissipation member. 請求項5に記載の放熱構造を有し、波長変換部材が放射する光を反射部材により外部の所定方向に出射する発光装置において、前記放熱部材として、前記反射部材を用いたことを特徴とする発光装置。   6. A light emitting device having the heat dissipation structure according to claim 5, wherein the light emitted from the wavelength conversion member is emitted in a predetermined external direction by a reflection member, wherein the reflection member is used as the heat dissipation member. Light emitting device. 請求項5に記載の放熱構造を有し、波長変換部材が放射する光を反射部材により外部の所定方向に出射する発光装置において、前記放熱部材は、前記反射部材の外周形状に合致する放熱リングとし、前記反射部材の外周に固定したことを特徴とする発光装置。   6. A light emitting device having the heat dissipation structure according to claim 5, wherein the light radiating from the wavelength converting member is emitted in a predetermined external direction by a reflecting member, and the heat radiating member is a heat radiating ring that matches an outer peripheral shape of the reflecting member. And a light emitting device fixed to the outer periphery of the reflecting member. 前記波長変換部材を保持した前記保持部材を前記放熱リングに圧入したことを特徴とする請求項7に記載の発光装置。   The light emitting device according to claim 7, wherein the holding member holding the wavelength conversion member is press-fitted into the heat dissipation ring. 前記波長変換部材は、前記反射部材の中央部から出射するレーザ光が背面に照射されることを特徴とする請求項6〜8のいずれかに記載の発光装置。   The light emitting device according to any one of claims 6 to 8, wherein the wavelength conversion member is irradiated with a laser beam emitted from a central portion of the reflection member on a back surface. 前記反射部材の反射面は放物面であり、前記反射部材の放物面の焦点位置に、前記保持部材により前記波長変換部材を保持したことを特徴とする請求項6〜9のいずれかに記載の発光装置。   The reflection surface of the reflection member is a paraboloid, and the wavelength conversion member is held by the holding member at a focal position of the paraboloid of the reflection member. The light-emitting device of description.
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