JP5891858B2 - Light emitting device and vehicle lamp - Google Patents

Light emitting device and vehicle lamp Download PDF

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JP5891858B2
JP5891858B2 JP2012051973A JP2012051973A JP5891858B2 JP 5891858 B2 JP5891858 B2 JP 5891858B2 JP 2012051973 A JP2012051973 A JP 2012051973A JP 2012051973 A JP2012051973 A JP 2012051973A JP 5891858 B2 JP5891858 B2 JP 5891858B2
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wavelength conversion
conversion member
excitation light
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JP2013187406A (en
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智鵬 袁
智鵬 袁
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Stanley Electric Co Ltd
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本発明は、発光装置及びこれを用いた車両用灯具に係り、特に、波長変換部材を用いた発光装置及びこれを用いた車両用灯具に関する。   The present invention relates to a light emitting device and a vehicle lamp using the same, and more particularly to a light emitting device using a wavelength conversion member and a vehicle lamp using the same.

従来、励起光源と波長変換部材とを組み合わせた発光装置が提案されている（例えば、特許文献１参照）。   Conventionally, a light-emitting device that combines an excitation light source and a wavelength conversion member has been proposed (see, for example, Patent Document 1).

図４は、特許文献１に記載の発光装置２００の縦断面図である。   FIG. 4 is a longitudinal sectional view of the light emitting device 200 described in Patent Document 1. As shown in FIG.

図４に示すように、特許文献１に記載の発光装置２００は、励起光源２１０（レーザーダイオード）と励起光源２１０からの光を受光するように配置された波長変換部材２２０（蛍光体組成物）、波長変換部材２２０が発する光が透過するレンズ２３０等を備えている。   As shown in FIG. 4, the light emitting device 200 described in Patent Document 1 includes an excitation light source 210 (laser diode) and a wavelength conversion member 220 (phosphor composition) arranged to receive light from the excitation light source 210. In addition, a lens 230 or the like through which light emitted from the wavelength conversion member 220 passes is provided.

特許文献１に記載の発光装置２００においては、励起光源２１０からの励起光（レーザー光）が照射された波長変換部材２２０は、励起光源２１０からの励起光により励起される光と波長変換部材２２０透過する励起光源２１０からの励起光との混色による白色光を発する。   In the light emitting device 200 described in Patent Document 1, the wavelength conversion member 220 irradiated with the excitation light (laser light) from the excitation light source 210 is the light that is excited by the excitation light from the excitation light source 210 and the wavelength conversion member 220. White light is emitted by mixing the excitation light from the transmitted excitation light source 210.

特開２００５−２００１０号公報Japanese Patent Laid-Open No. 2005-20010

しかしながら、特許文献１に記載の発光装置２００においては、励起光源２１０からの励起光の照射方向と波長変換部材２２０からの光の取り出し方向とが一致しているため、波長変換部材２２０が何らの理由で脱落（又は破損等）すると、励起光源２１０からの励起光（レーザー光）が外部に漏れ出すという問題がある。   However, in the light emitting device 200 described in Patent Literature 1, the irradiation direction of the excitation light from the excitation light source 210 and the extraction direction of the light from the wavelength conversion member 220 are the same. If it is dropped (or damaged) for the reason, there is a problem that excitation light (laser light) from the excitation light source 210 leaks to the outside.

本発明は、このような事情に鑑みてなされたものであり、波長変換部材が脱落（又は破損等）した場合、励起光源からの励起光が外部に漏れ出ない発光装置及びこれを用いた車両用灯具を提供することを目的とする。   The present invention has been made in view of such circumstances, and a light-emitting device in which excitation light from an excitation light source does not leak to the outside when a wavelength conversion member is dropped (or damaged) and a vehicle using the same The purpose is to provide lighting equipment.

上記目的を達成するため、本発明は、励起光を吸収し、波長変換して所定の波長域の光を放出する波長変換部材と、前記波長変換部材を保持する波長変換部材保持部と、励起光源と、前記励起光源からの励起光を集光して前記波長変換部材保持部に保持された前記波長変換部材に照射するレンズと、を備えており、前記波長変換部材保持部は、前記レンズで集光された前記励起光源からの励起光が通過する位置に第１開口が形成された第１保持部と、前記第１開口を通過した前記レンズにより集光された前記励起光源からの励起光が通過する位置に第２開口が形成された第２保持部と、を含んでおり、前記波長変換部材は、前記第１保持部と前記第２保持部との間に保持されており、前記波長変換部材のうち、前記レンズで集光された前記励起光源からの励起光の照射方向に交差する方向に位置する部分が、光取り出し部とされ、前記レンズの焦点は、前記第２開口近傍に設定されており、前記第２開口は、前記第１開口より小サイズとされていることを特徴とする。 In order to achieve the above object, the present invention provides a wavelength conversion member that absorbs excitation light, converts the wavelength and emits light in a predetermined wavelength range, a wavelength conversion member holding portion that holds the wavelength conversion member, and excitation A light source, and a lens that collects the excitation light from the excitation light source and irradiates the wavelength conversion member held by the wavelength conversion member holding unit, and the wavelength conversion member holding unit includes the lens Excitation from the excitation light source condensed by the first holding portion in which the first opening is formed at a position where the excitation light from the excitation light source condensed in the passage passes, and the lens passing through the first opening. A second holding part in which a second opening is formed at a position where light passes, and the wavelength conversion member is held between the first holding part and the second holding part, Of the wavelength conversion member, the excitation light collected by the lens. Portion positioned in a direction crossing the direction of irradiation of excitation light from the light source, is the light extraction portion, the focus of the lens is set to the second opening near said second opening, said first The size is smaller than the opening .

本発明によれば、波長変換部材のうち、レンズで集光された励起光源からの励起光の照射方向に交差する方向に位置する部分が光取り出し部とされているため（すなわち、励起光源からの励起光の照射方向と波長変換部材からの光の取り出し方向とが一致していないため）、波長変換部材が波長変換部材保持部から脱落した場合（又は破損した場合）、励起光源からの励起光は、第１開口及び第２開口を通過することとなり、光取り出し部の方向へは照射されない。 According to the present invention, the portion of the wavelength conversion member located in the direction intersecting the irradiation direction of the excitation light from the excitation light source collected by the lens is the light extraction portion (that is, from the excitation light source). When the wavelength conversion member falls off (or breaks) from the wavelength conversion member holding portion, the excitation light from the excitation light source is excited. The light passes through the first opening and the second opening, and is not irradiated in the direction of the light extraction unit.

従って、本発明によれば、波長変換部材が波長変換部材保持部から脱落した場合（又は破損した場合）、励起光源からの励起光が、照射方向に交差する方向（光の取り出し方向）へ放出され、外部に漏れ出るのを防止することが可能となる。 Therefore, according to the present invention, when the wavelength conversion member falls off (or breaks) from the wavelength conversion member holding part, the excitation light from the excitation light source is emitted in a direction intersecting the irradiation direction (light extraction direction). It is possible to prevent leakage to the outside.

本発明によれば、レンズの焦点を第２開口近傍に設定することで、凸レンズにより集光された励起光源からの励起光が通過する第２開口を、第１開口より小サイズにすることが可能となる。その結果、波長変換部材が発する光のうち第２開口から漏れる光が少なくなるため、波長変換部材の光取り出し部から放出される光の取り出し効率を高めることが可能となる。 According to the present invention, by setting the focal point of the lens in the vicinity of the second aperture, the second aperture through which the excitation light from the excitation light source condensed by the convex lens passes can be made smaller than the first aperture. It becomes possible. As a result, light leaking from the second opening among the light emitted from the wavelength conversion member is reduced, and it is possible to increase the extraction efficiency of light emitted from the light extraction portion of the wavelength conversion member.

本発明は、本発明の発光装置と、前記光取り出し部からの光を車両前方に照射して所定配光パターンを形成するように構成された光学系と、を備えることを特徴とする。 The present invention includes the light-emitting device of the present invention , and an optical system configured to form a predetermined light distribution pattern by irradiating light from the light extraction unit forward of the vehicle.

本発明によれば、波長変換部材が保持部から脱落した場合（又は破損した場合）、励起光源からの励起光が、車両前方に照射されない車両用灯具を構成することが可能となる。 ADVANTAGE OF THE INVENTION According to this invention, when the wavelength conversion member falls from a holding | maintenance part (or when it breaks), it becomes possible to comprise the vehicle lamp with which the excitation light from an excitation light source is not irradiated ahead of a vehicle.

本発明によれば、波長変換部材が脱落した場合（又は破損した場合）、励起光源からの励起光が外部に漏れ出ない発光装置及びこれを用いた車両用灯具を提供することが可能となる。   ADVANTAGE OF THE INVENTION According to this invention, when a wavelength conversion member falls off (or when it breaks), it becomes possible to provide the light-emitting device from which the excitation light from an excitation light source does not leak outside, and a vehicle lamp using the same. .

（ａ）本発明の一実施形態である発光装置１０の縦断面図（波長変換部材１８有り）、（ｂ）発光装置１０の縦断面図（波長変換部材１８無し）である。(A) The longitudinal cross-sectional view (with the wavelength conversion member 18) of the light-emitting device 10 which is one Embodiment of this invention, (b) The longitudinal cross-sectional view (without the wavelength conversion member 18) of the light-emitting device 10. （ａ）発光装置１０を用いた車両用灯具ユニット３６Ａの縦断面図、（ｂ）発光装置１０を用いた車両用灯具ユニット３６Ｂの縦断面図である。(A) A longitudinal sectional view of a vehicle lamp unit 36A using the light emitting device 10, and (b) a longitudinal sectional view of a vehicle lamp unit 36B using the light emitting device 10. （ａ）変形例である発光装置１０Ａの断面図（波長変換部材１８有り）、（ｂ）発光装置１０Ａの断面図（波長変換部材１８無し）である。(A) It is sectional drawing (with the wavelength conversion member 18) of 10 A of light-emitting devices which are modifications, (b) It is sectional drawing (without the wavelength conversion member 18) of 10 A of light-emitting devices. 特許文献１に記載の発光装置２００の縦断面図である。2 is a longitudinal sectional view of a light emitting device 200 described in Patent Document 1. FIG.

以下、本発明の一実施形態である発光装置について、図面を参照しながら説明する。   Hereinafter, a light emitting device according to an embodiment of the present invention will be described with reference to the drawings.

図１（ａ）は本発明の一実施形態である発光装置１０の断面図（波長変換部材１８有り）、図１（ｂ）は発光装置１０の断面図（波長変換部材１８無し）である。   1A is a cross-sectional view of the light-emitting device 10 according to an embodiment of the present invention (with the wavelength conversion member 18), and FIG. 1B is a cross-sectional view of the light-emitting device 10 (without the wavelength conversion member 18).

図１（ａ）に示すように、本実施形態の発光装置１０は、ホルダー１２、励起光源１４、レンズ１６、波長変換部材１８等を備えている。   As shown in FIG. 1A, the light emitting device 10 of this embodiment includes a holder 12, an excitation light source 14, a lens 16, a wavelength conversion member 18, and the like.

ホルダー１２は、ホルダー本体２０と波長変換部材保持部２２とを含んでいる。   The holder 12 includes a holder main body 20 and a wavelength conversion member holding part 22.

ホルダー本体２０は、励起光源１４及びレンズ１６を保持する部分であり、例えば、アルミ等の金属製円筒型部材である。   The holder body 20 is a portion that holds the excitation light source 14 and the lens 16 and is, for example, a metal cylindrical member such as aluminum.

図１（ａ）に示すように、ホルダー本体２０は横向きに配置されており、その下部側面には、冷却装置としてのペルチェ素子２４を間に挟んでヒートシンク等の放熱部材２６が固定されている。発光装置１０（励起光源１４や波長変換部材１８等）の発熱は、ペルチェ素子２４、放熱部材２６を通過し、放熱部材２６（例えばヒートシンクの放熱フィン）から周辺空気へ放出される。   As shown in FIG. 1A, the holder main body 20 is disposed sideways, and a heat radiating member 26 such as a heat sink is fixed to a lower side surface of the holder main body 20 with a Peltier element 24 as a cooling device interposed therebetween. . Heat generated by the light emitting device 10 (excitation light source 14, wavelength conversion member 18, etc.) passes through the Peltier element 24 and the heat radiating member 26 and is released from the heat radiating member 26 (for example, heat radiating fins of the heat sink) to the surrounding air.

励起光源１４は、励起光を発生する励起光源であり、ホルダー本体２０の基端部側に固定されている。本実施形態では、励起光源１４として、発光波長が４３０〜４６０ｎｍ程度のＬＤ（レーザーダイオード等の半導体レーザー光源）を用いている。   The excitation light source 14 is an excitation light source that generates excitation light, and is fixed to the base end side of the holder body 20. In the present embodiment, an LD (semiconductor laser light source such as a laser diode) having an emission wavelength of about 430 to 460 nm is used as the excitation light source 14.

レンズ１６は、励起光源１４からの励起光Ｒａｙ１（レーザー光）を集光して波長変換部材保持部２２に保持された波長変換部材１８に照射するレンズ（例えば、凸レンズ）であり、ホルダー本体２０に固定されて、励起光源１４と波長変換部材保持部２２との間に配置されている。   The lens 16 is a lens (for example, a convex lens) that collects the excitation light Ray1 (laser light) from the excitation light source 14 and irradiates the wavelength conversion member 18 held by the wavelength conversion member holding portion 22. And is arranged between the excitation light source 14 and the wavelength conversion member holding part 22.

波長変換部材保持部２２は、波長変換部材１８を保持する部分であり、例えば、励起光源１４からの励起光Ｒａｙ１の照射方向ＡＸ（励起光源１４の光軸）に交差する方向（図１（ａ）中照射方向ＡＸに直交する上下方向）に延びた有底の凹部である。波長変換部材保持部２２は、ホルダー本体２０の先端部に連続して設けられている。波長変換部材１８は、波長変換部材保持部２２（凹部）に挿入され、その上面１８ａ以外の面が取り囲まれた状態で波長変換部材保持部２２により保持されている。   The wavelength conversion member holding part 22 is a part that holds the wavelength conversion member 18, and is, for example, a direction that intersects the irradiation direction AX of the excitation light Ray1 from the excitation light source 14 (the optical axis of the excitation light source 14) (FIG. ) A bottomed recess extending in the vertical direction perpendicular to the middle irradiation direction AX. The wavelength conversion member holding part 22 is provided continuously at the tip of the holder body 20. The wavelength conversion member 18 is inserted into the wavelength conversion member holding portion 22 (concave portion), and is held by the wavelength conversion member holding portion 22 in a state in which a surface other than the upper surface 18a is surrounded.

波長変換部材保持部２２（凹部）は、波長変換部材１８の上面１８ａ以外の面を取り囲む面として、少なくとも、レンズ１６で集光された励起光源１４からの励起光Ｒａｙ１が通過する位置に第１開口２８ａが形成された第１保持部と、第１開口２８ａを通過したレンズ１６により集光された励起光源１４からの励起光Ｒａｙ１が通過する位置に第２開口３０ａが形成された第２保持部３０と、底面３２と、を含んでいる。波長変換部材１８は、波長変換部材保持部２２（凹部）に挿入され、第１保持部２８と第２保持部３０との間に保持されている（図１（ａ）参照）。   The wavelength conversion member holding portion 22 (concave portion) is a surface surrounding the surface other than the upper surface 18a of the wavelength conversion member 18, and is at least at a position where the excitation light Ray1 from the excitation light source 14 collected by the lens 16 passes. A second holding unit in which the second opening 30a is formed at a position through which the first holding part in which the opening 28a is formed and the excitation light Ray1 from the excitation light source 14 collected by the lens 16 that has passed through the first opening 28a passes. A portion 30 and a bottom surface 32 are included. The wavelength conversion member 18 is inserted into the wavelength conversion member holding portion 22 (concave portion), and is held between the first holding portion 28 and the second holding portion 30 (see FIG. 1A).

波長変換部材保持部２２（凹部）の内壁には、アルミや銀等の金属蒸着を施すことで反射面３４を形成するのが望ましい。このようにすれば、波長変換部材１８が発する光のうち波長変換部材１８の上面１８ａ以外の面から出射しようとする光が、反射面３４で反射されて波長変換部材１８側に戻されることとなるため、波長変換部材１８の上面１８ａから放出される光の取り出し効率を高めることが可能となる。   It is desirable to form the reflective surface 34 on the inner wall of the wavelength conversion member holding part 22 (concave part) by performing metal vapor deposition such as aluminum or silver. If it does in this way, the light which is going to be radiate | emitted from surfaces other than the upper surface 18a of the wavelength conversion member 18 among the lights which the wavelength conversion member 18 emits is reflected by the reflective surface 34, and is returned to the wavelength conversion member 18 side. Therefore, the extraction efficiency of light emitted from the upper surface 18a of the wavelength conversion member 18 can be increased.

レンズ１６の焦点Ｆは第２開口３０ａ近傍に設定されている。このようにレンズ１６の焦点Ｆを第２開口３０ａ近傍に設定することで、レンズ１６により集光された励起光源１４からの励起光Ｒａｙ１が通過する第２開口３０ａを、第１開口２８ａより小サイズにすることが可能となる。その結果、波長変換部材１８が発する光のうち第２開口３０ａから漏れる光が少なくなるため、波長変換部材１８の上面１８ａから放出される光の取り出し効率を高めることが可能となる。   The focal point F of the lens 16 is set in the vicinity of the second opening 30a. By setting the focal point F of the lens 16 in the vicinity of the second opening 30a in this way, the second opening 30a through which the excitation light Ray1 from the excitation light source 14 collected by the lens 16 passes is smaller than the first opening 28a. It becomes possible to make it into a size. As a result, light leaking from the second opening 30a out of the light emitted from the wavelength conversion member 18 is reduced, so that the extraction efficiency of light emitted from the upper surface 18a of the wavelength conversion member 18 can be increased.

波長変換部材１８は、励起光Ｒａｙ１を吸収し、波長変換して所定の波長域の光を放出する波長変換部材である。本実施形態では、波長変換部材１８として、波長変換部材保持部２２（凹部）と略同サイズの板状の蛍光体（例えば、ＹＡＧ等の黄色蛍光体）を用いている。   The wavelength conversion member 18 is a wavelength conversion member that absorbs the excitation light Ray1, converts the wavelength, and emits light in a predetermined wavelength range. In the present embodiment, a plate-like phosphor (for example, a yellow phosphor such as YAG) having substantially the same size as the wavelength conversion member holding portion 22 (concave portion) is used as the wavelength conversion member 18.

波長変換部材１８は、波長変換部材保持部２２（凹部）に挿入され、その上面１８ａ以外の面が取り囲まれた状態で波長変換部材保持部２２（凹部）により保持されている。波長変換部材１８と波長変換部材保持部２２（凹部）とは、公知の接着剤等の手段を用いて固定されている。波長変換部材１８の上面１８ａは、波長変換部材保持部２２（凹部）上端開口から露出して、光取り出し部を構成している。   The wavelength conversion member 18 is inserted into the wavelength conversion member holding portion 22 (recessed portion), and is held by the wavelength conversion member holding portion 22 (recessed portion) in a state where the surface other than the upper surface 18a is surrounded. The wavelength conversion member 18 and the wavelength conversion member holding portion 22 (concave portion) are fixed using a known means such as an adhesive. The upper surface 18a of the wavelength conversion member 18 is exposed from the upper end opening of the wavelength conversion member holding portion 22 (concave portion), and constitutes a light extraction portion.

すなわち、波長変換部材１８のうち、レンズ１６で集光された励起光源１４からの励起光Ｒａｙ１の照射方向ＡＸに交差する方向（図１（ａ）中照射方向ＡＸに直交する上方向）に位置する部分（波長変換部材１８の上面１８ａ）が、光取り出し部とされている。   That is, the wavelength conversion member 18 is positioned in a direction intersecting the irradiation direction AX of the excitation light Ray1 from the excitation light source 14 collected by the lens 16 (upward direction orthogonal to the irradiation direction AX in FIG. 1A). The part to be performed (the upper surface 18a of the wavelength conversion member 18) is a light extraction portion.

上記構成の発光装置１０によれば、波長変換部材１８が波長変換部材保持部２２（凹部）に保持されている場合、励起光源１４からの励起光Ｒａｙ１は、次の光路を辿る。   According to the light emitting device 10 having the above configuration, when the wavelength conversion member 18 is held by the wavelength conversion member holding portion 22 (concave portion), the excitation light Ray1 from the excitation light source 14 follows the next optical path.

すなわち、波長変換部材１８が波長変換部材保持部２２（凹部）に保持されている場合、励起光源１４からの励起光Ｒａｙ１は、図１（ａ）に示すように、レンズ１６で集光され、第１開口２８ａを通過し、波長変換部材保持部２２（凹部）に保持された波長変換部材１８を照射する。   That is, when the wavelength conversion member 18 is held in the wavelength conversion member holding portion 22 (concave portion), the excitation light Ray1 from the excitation light source 14 is condensed by the lens 16 as shown in FIG. The wavelength conversion member 18 that passes through the first opening 28a and is held by the wavelength conversion member holding portion 22 (concave portion) is irradiated.

励起光源１４からの励起光Ｒａｙ１が照射された波長変換部材１８は、励起光源１４からの励起光Ｒａｙ１により励起される光と波長変換部材１８を（内部散乱等して）透過する励起光源１４からの励起光Ｒａｙ１との混色による白色光を発する。   The wavelength conversion member 18 irradiated with the excitation light Ray1 from the excitation light source 14 is transmitted from the excitation light source 14 that transmits the light converted by the excitation light Ray1 from the excitation light source 14 and the wavelength conversion member 18 (by internal scattering or the like). Emits white light by mixing with the excitation light Ray1.

波長変換部材１８が発する白色光は、波長変換部材保持部２２（凹部）の内壁に形成された反射面３４で反射されて（又は反射面３４で反射されることなく直接）、波長変換部材１８の上面１８ａ（光取り出し部）から放出される。   The white light emitted from the wavelength conversion member 18 is reflected by the reflection surface 34 formed on the inner wall of the wavelength conversion member holding portion 22 (concave portion) (or directly without being reflected by the reflection surface 34), and the wavelength conversion member 18. From the upper surface 18a (light extraction portion).

一方、何らかの理由で（例えば、発光装置１０が搭載された車両の振動等の影響で）、波長変換部材１８が波長変換部材保持部２２（凹部）から脱落した場合（又は破損した場合）、励起光源１４からの励起光Ｒａｙ１は、次の光路を辿る。   On the other hand, when for some reason (for example, due to the influence of vibration of the vehicle on which the light emitting device 10 is mounted), the wavelength conversion member 18 is dropped (or damaged) from the wavelength conversion member holding portion 22 (concave portion), excitation is performed. The excitation light Ray1 from the light source 14 follows the next optical path.

すなわち、本実施形態では、波長変換部材１８のうち、レンズ１６で集光された励起光源１４からの励起光Ｒａｙ１の照射方向ＡＸに交差する方向（図１（ａ）中照射方向ＡＸに直交する上方向）に位置する部分（波長変換部材１８の上面１８ａ）が光取り出し部とされているため（すなわち、励起光源１４からの励起光Ｒａｙ１の照射方向ＡＸと波長変換部材１８からの光の取り出し方向とが一致していないため）、波長変換部材１８が波長変換部材保持部２２から脱落した場合（又は破損した場合）、励起光源１４からの励起光Ｒａｙ１は、図１（ｂ）に示すように、第１開口２８ａ及び第２開口３０ａを通過することとなり、光取り出し部（波長変換部材１８の上面１８ａ）の方向へは照射されない。   That is, in the present embodiment, in the wavelength conversion member 18, the direction intersecting the irradiation direction AX of the excitation light Ray1 from the excitation light source 14 collected by the lens 16 (perpendicular to the irradiation direction AX in FIG. 1A). The portion located in the upward direction (the upper surface 18a of the wavelength conversion member 18) serves as a light extraction portion (that is, the irradiation direction AX of the excitation light Ray1 from the excitation light source 14 and the extraction of light from the wavelength conversion member 18). When the wavelength conversion member 18 falls off (or breaks) from the wavelength conversion member holding portion 22, the excitation light Ray 1 from the excitation light source 14 is as shown in FIG. In addition, the light passes through the first opening 28a and the second opening 30a and is not irradiated in the direction of the light extraction portion (the upper surface 18a of the wavelength conversion member 18).

従って、波長変換部材１８が波長変換部材保持部２２（凹部）から脱落した場合（又は破損した場合）、励起光源１４からの励起光Ｒａｙ１が、照射方向ＡＸに交差する方向（図１（ｂ）中照射方向ＡＸに直交する上方向。すなわち、光の取り出し方向。）へ放出され、外部に漏れ出るのを防止することが可能となる。   Therefore, when the wavelength conversion member 18 falls off (or breaks) from the wavelength conversion member holding portion 22 (concave portion), the excitation light Ray1 from the excitation light source 14 intersects the irradiation direction AX (FIG. 1B). It is possible to prevent the light from being emitted to the outside and leaking out to the outside.

次に、上記構成の発光装置１０を用いた車両用灯具（車両用灯具ユニット）の構成例を説明する。   Next, a configuration example of a vehicle lamp (vehicle lamp unit) using the light emitting device 10 having the above configuration will be described.

図２（ａ）は、発光装置１０を用いた車両用灯具ユニット３６Ａの縦断面図である。   FIG. 2A is a longitudinal sectional view of a vehicle lamp unit 36A using the light emitting device 10. FIG.

図２（ａ）に示すように、車両用灯具ユニット３６Ａは、プロジェクタ型の灯具ユニットであり、投影レンズ３８、発光装置１０、反射面４０、シェード４２等を備えている。   As shown in FIG. 2A, the vehicular lamp unit 36A is a projector-type lamp unit, and includes a projection lens 38, a light emitting device 10, a reflecting surface 40, a shade 42, and the like.

投影レンズ３８は、レンズホルダ（図示せず）等に保持されて、車両前後方向に延びる光軸ＡＸ３６Ａ上に配置されている。 The projection lens 38 is held on a lens holder (not shown) or the like, and is disposed on an optical axis AX 36A that extends in the vehicle front-rear direction.

投影レンズ３８は、例えば、車両前方側表面が凸面で車両後方側表面が平面の平凸非球面の投影レンズである。   The projection lens 38 is, for example, a planoconvex aspherical projection lens having a convex surface on the front side of the vehicle and a flat surface on the rear side of the vehicle.

発光装置１０は、波長変換部材１８の上面１８ａ（光取り出し部）を上向きとし、かつ波長変換部材１８の上面１８ａ（光取り出し部）を、投影レンズ３８の後側焦点Ｆ３８より後方側かつ光軸ＡＸ３６Ａ近傍に位置させた状態で配置されている。 In the light emitting device 10, the upper surface 18 a (light extraction portion) of the wavelength conversion member 18 faces upward, and the upper surface 18 a (light extraction portion) of the wavelength conversion member 18 is positioned behind the rear focal point F 38 of the projection lens 38 and light. It arrange | positions in the state located in the shaft AX36A vicinity.

反射面４０は、第１焦点Ｆ１４０が波長変換部材１８の上面１８ａ（光取り出し部）近傍に設定され、第２焦点Ｆ２４０が投影レンズ３８の後側焦点Ｆ３８近傍に設定された回転楕円系の反射面（回転楕円面又はこれに類する自由曲面等）である。 The reflecting surface 40, the first focal point F1 40 is set on the upper surface 18a (light extraction part) near the wavelength conversion member 18, the rotational ellipsoid second focal point F2 40 is set near the side focal point F 38 of the projection lens 38 It is a reflection surface of the system (spheroid surface or similar free-form surface).

反射面４０は、発光装置１０（波長変換部材１８の上面１８ａ（光取り出し部））から上向きに放射される光が入射するように、発光装置１０の側方（図２（ａ）中、車両後方側の側方）から発光装置１０の上方を通って投影レンズ３８に向かって延びて、発光装置１０の上方を覆っている。   The reflecting surface 40 is disposed on the side of the light emitting device 10 (see FIG. 2A) so that light emitted upward from the light emitting device 10 (the upper surface 18a (light extraction portion) of the wavelength conversion member 18) is incident. It extends from above the light emitting device 10 toward the projection lens 38 and covers the light emitting device 10.

シェード４２は、発光装置１０からの光の一部を遮光する遮光部材であり、その上端縁を投影レンズ３８の後側焦点Ｆ３８近傍に位置させた状態で、投影レンズ３８と発光装置１０との間に配置されている。 The shade 42 is a light blocking member that blocks a part of the light from the light emitting device 10, and the projection lens 38, the light emitting device 10, and the upper end edge thereof are positioned in the vicinity of the rear focal point F 38 of the projection lens 38. It is arranged between.

上記構成の車両用灯具ユニット３６Ａにおいては、波長変換部材１８が波長変換部材保持部２２（凹部）に保持されている場合、波長変換部材１８の上面１８ａ（光取り出し部）から放出された白色光は、次の光路を辿る。   In the vehicular lamp unit 36A having the above configuration, when the wavelength conversion member 18 is held by the wavelength conversion member holding portion 22 (concave portion), white light emitted from the upper surface 18a (light extraction portion) of the wavelength conversion member 18 is obtained. Follows the next light path.

すなわち、波長変換部材１８が波長変換部材保持部２２（凹部）に保持されている場合、波長変換部材１８の上面１８ａ（光取り出し部）から放出された白色光Ｒａｙ２は、図２（ａ）に示すように、反射面４０で反射されて、投影レンズ３８の後側焦点Ｆ３８近傍で集光した後、投影レンズ３８を透過して前方に照射され、車両前面に正対した仮想鉛直スクリーン（例えば、車両前方約２５ｍに配置されている）上に、所定配光パターン（例えば、シェード４２により規定されるカットオフラインを上端縁に含むロービーム用配光パターン）を形成する。 That is, when the wavelength conversion member 18 is held by the wavelength conversion member holding portion 22 (concave portion), the white light Ray2 emitted from the upper surface 18a (light extraction portion) of the wavelength conversion member 18 is shown in FIG. As shown, after being reflected by the reflecting surface 40 and condensed near the rear focal point F 38 of the projection lens 38, it passes through the projection lens 38 and is irradiated forward, and a virtual vertical screen (facing to the front of the vehicle) For example, a predetermined light distribution pattern (for example, a low-beam light distribution pattern including a cut-off line defined by the shade 42 at the upper end edge) is formed on the front of the vehicle.

一方、何らかの理由で（例えば、車両用灯具ユニット３６Ａが搭載された車両の振動等の影響で）、波長変換部材１８が波長変換部材保持部２２（凹部）から脱落した場合（又は破損した場合）、励起光源１４からの励起光Ｒａｙ１は、次の光路を辿る。   On the other hand, when the wavelength conversion member 18 falls off from the wavelength conversion member holding portion 22 (recessed portion) (or is damaged) for some reason (for example, due to the vibration of the vehicle on which the vehicle lamp unit 36A is mounted). The excitation light Ray1 from the excitation light source 14 follows the next optical path.

すなわち、波長変換部材１８が波長変換部材保持部２２（凹部）から脱落した場合（又は破損した場合）、励起光源１４からの励起光Ｒａｙ１は、図１（ｂ）に示すように、レンズ１６で集光され、第１開口２８ａ、第２開口３０ａを通過する。この各開口２８ａ、３０ａを通過した励起光Ｒａｙ１は、シェード４２により遮光される。   That is, when the wavelength conversion member 18 falls off (or breaks) from the wavelength conversion member holding portion 22 (concave portion), the excitation light Ray1 from the excitation light source 14 is transmitted through the lens 16 as shown in FIG. The light is condensed and passes through the first opening 28a and the second opening 30a. The excitation light Ray1 that has passed through the openings 28a and 30a is shielded by the shade 42.

従って、図２（ａ）に示した車両用灯具ユニット３６Ａにおいては、波長変換部材１８が波長変換部材保持部２２（凹部）から脱落した場合（又は破損した場合）、励起光源１４からの励起光Ｒａｙ１が、照射方向ＡＸに交差する方向（図１（ｂ）中照射方向ＡＸに直交する上方向）へ放出され、車両前方に照射されるのを防止することが可能となる。   Accordingly, in the vehicular lamp unit 36A shown in FIG. 2A, when the wavelength conversion member 18 is dropped (or damaged) from the wavelength conversion member holding portion 22 (recessed portion), excitation light from the excitation light source 14 is emitted. It is possible to prevent Ray1 from being emitted in a direction intersecting the irradiation direction AX (an upward direction orthogonal to the irradiation direction AX in FIG. 1B) and being irradiated to the front of the vehicle.

図２（ｂ）は、発光装置１０を用いた車両用灯具ユニット３６Ｂの縦断面図である。   FIG. 2B is a longitudinal sectional view of a vehicle lamp unit 36 </ b> B using the light emitting device 10.

図２（ｂ）に示す車両用灯具ユニット３６Ｂは、図２（ａ）に示す車両用灯具ユニット３６Ａと比べ、発光装置１０の向きが異なる点以外、車両用灯具ユニット３６Ａと同様の構成である。   The vehicle lamp unit 36B shown in FIG. 2 (b) has the same configuration as the vehicle lamp unit 36A except that the direction of the light emitting device 10 is different from that of the vehicle lamp unit 36A shown in FIG. 2 (a). .

上記構成の車両用灯具ユニット３６Ｂにおいては、波長変換部材１８が波長変換部材保持部２２（凹部）に保持されている場合、波長変換部材１８の上面１８ａ（光取り出し部）から放出された白色光Ｒａｙ２は、車両用灯具ユニット３６Ａと同様の光路を辿る（図２（ｂ）参照）。   In the vehicle lamp unit 36B having the above configuration, when the wavelength conversion member 18 is held by the wavelength conversion member holding portion 22 (recessed portion), white light emitted from the upper surface 18a (light extraction portion) of the wavelength conversion member 18 is obtained. Ray2 follows the same optical path as the vehicle lamp unit 36A (see FIG. 2B).

一方、何らかの理由で（例えば、車両用灯具ユニット３６Ｂが搭載された車両の振動等の影響で）、波長変換部材１８が波長変換部材保持部２２（凹部）から脱落した場合（又は破損した場合）、励起光源１４からの励起光Ｒａｙ１は、次の光路を辿る。   On the other hand, when the wavelength conversion member 18 falls off from the wavelength conversion member holding portion 22 (concave portion) (or is damaged) for some reason (for example, due to the vibration of the vehicle on which the vehicle lamp unit 36B is mounted). The excitation light Ray1 from the excitation light source 14 follows the next optical path.

すなわち、波長変換部材１８が波長変換部材保持部２２（凹部）から脱落した場合（又は破損した場合）、励起光源１４からの励起光Ｒａｙ１は、図１（ｂ）に示すように、レンズ１６で集光され、第１開口２８ａ、第２開口３０ａを通過する。この各開口２８ａ、３０ａを通過した励起光Ｒａｙ１は、車両後方に向けて照射される。   That is, when the wavelength conversion member 18 falls off (or breaks) from the wavelength conversion member holding portion 22 (concave portion), the excitation light Ray1 from the excitation light source 14 is transmitted through the lens 16 as shown in FIG. The light is condensed and passes through the first opening 28a and the second opening 30a. The excitation light Ray1 that has passed through the openings 28a and 30a is irradiated toward the rear of the vehicle.

従って、図２（ｂ）に示した車両用灯具ユニット３６Ｂにおいては、波長変換部材１８が波長変換部材保持部２２（凹部）から脱落した場合（又は破損した場合）、励起光源１４からの励起光Ｒａｙ１が、照射方向ＡＸに交差する方向（図１（ｂ）中照射方向ＡＸに直交する上方向）へ放出され、車両前方に照射されるのを防止することが可能となる。   Therefore, in the vehicular lamp unit 36B shown in FIG. 2B, when the wavelength conversion member 18 falls off (or breaks) from the wavelength conversion member holding portion 22 (concave portion), the excitation light from the excitation light source 14 It is possible to prevent Ray1 from being emitted in a direction intersecting the irradiation direction AX (an upward direction orthogonal to the irradiation direction AX in FIG. 1B) and being irradiated to the front of the vehicle.

なお、第１開口２８ａ、第２開口３０ａを通過した励起光Ｒａｙ１を受光するセンサを第２開口３０ａの前方に設け、そのセンサの出力に基づいて、励起光源１４（の励起光の発生）を停止する手段を設けてもよい。   A sensor that receives the excitation light Ray1 that has passed through the first opening 28a and the second opening 30a is provided in front of the second opening 30a, and the excitation light source 14 (generation of excitation light) is provided based on the output of the sensor. Means for stopping may be provided.

以上説明したように、本実施形態の発光装置１０によれば、波長変換部材１８のうち、レンズ１６で集光された励起光源１４からの励起光Ｒａｙ１の照射方向ＡＸに交差する方向（図１（ａ）中照射方向ＡＸに直交する上方向）に位置する部分（波長変換部材１８の上面１８ａ）が光取り出し部とされているため（すなわち、励起光源１４からの励起光Ｒａｙ１の照射方向ＡＸと波長変換部材１８からの光の取り出し方向とが一致していないため）、波長変換部材１８が波長変換部材保持部２２から脱落した場合（又は破損した場合）、励起光源１４からの励起光Ｒａｙ１は、図１（ｂ）に示すように、第１開口２８ａ及び第２開口３０ａを通過することとなり、光取り出し部（波長変換部材１８の上面１８ａ）の方向へは照射されない。   As described above, according to the light emitting device 10 of the present embodiment, in the wavelength conversion member 18, the direction intersecting the irradiation direction AX of the excitation light Ray1 from the excitation light source 14 collected by the lens 16 (FIG. 1). (A) Since the portion (the upper surface 18a of the wavelength conversion member 18) located in the middle irradiation direction AX is the light extraction portion (that is, the irradiation direction AX of the excitation light Ray1 from the excitation light source 14). When the wavelength conversion member 18 falls off (or breaks) from the wavelength conversion member holding portion 22, the excitation light Ray 1 from the excitation light source 14 is not matched with the light extraction direction from the wavelength conversion member 18. 1b passes through the first opening 28a and the second opening 30a, and is not irradiated in the direction of the light extraction portion (the upper surface 18a of the wavelength conversion member 18).

従って、波長変換部材１８が波長変換部材保持部２２（凹部）から脱落した場合（又は破損した場合）、励起光源１４からの励起光Ｒａｙ１が、照射方向ＡＸに交差する方向（図１（ｂ）中照射方向ＡＸに直交する上方向。すなわち、光の取り出し方向。）へ放出され、外部に漏れ出るのを防止することが可能となる。   Therefore, when the wavelength conversion member 18 falls off (or breaks) from the wavelength conversion member holding portion 22 (concave portion), the excitation light Ray1 from the excitation light source 14 intersects the irradiation direction AX (FIG. 1B). It is possible to prevent the light from being emitted to the outside and leaking out to the outside.

次に、変形例について説明する。   Next, a modified example will be described.

図３（ａ）は発光装置１０の変形例である発光装置１０Ａの断面図（波長変換部材１８有り）、図３（ｂ）は発光装置１０Ａの断面図（波長変換部材１８無し）である。   3A is a cross-sectional view of a light-emitting device 10A that is a modification of the light-emitting device 10 (with the wavelength conversion member 18), and FIG. 3B is a cross-sectional view of the light-emitting device 10A (without the wavelength conversion member 18).

図３（ａ）に示すように、本変形例の発光装置１０Ａは、上記実施形態の発光装置１０と比べ、レンズ１６に代えて、焦点Ｆが波長変換部材１８近傍に設定され、励起光源１４からの励起光を集光して光軸ＡＸに対して平行な光とするレンズ１６Ａを用いている点、レンズ１６Ａにより集光された励起光Ｒａｙ３（光軸ＡＸに対して平行なレーザー光）が通過するように、第１開口２８ａ、第２開口３０ａが同一サイズとされている点が相違する。その他は、上記実施形態の発光装置１０と同様の構成である。   As shown in FIG. 3A, in the light emitting device 10A of this modification, the focal point F is set in the vicinity of the wavelength conversion member 18 instead of the lens 16 as compared with the light emitting device 10 of the above embodiment, and the excitation light source 14 The lens 16A is used to collect the excitation light from the lens 16 and make it parallel to the optical axis AX, and the excitation light Ray3 (laser light parallel to the optical axis AX) collected by the lens 16A Is different in that the first opening 28a and the second opening 30a have the same size. The other configuration is the same as that of the light emitting device 10 of the above embodiment.

本変形例の発光装置１０Ａによっても、上記実施形態の発光装置１０と同様の効果を奏することが可能となる。   Also with the light emitting device 10A of this modification, it is possible to achieve the same effects as the light emitting device 10 of the above embodiment.

また、本変形例の発光装置１０Ａによれば、レンズ１６と波長変換部材１８との距離の調整が不要となるため、生産性が向上する。   Further, according to the light emitting device 10A of the present modification, the adjustment of the distance between the lens 16 and the wavelength conversion member 18 is not necessary, so that productivity is improved.

上記実施形態では、励起光源１４がレーザーダイオード等の半導体レーザー光源（発光波長：４３０〜４６０ｎｍ程度）で、波長変換部材１８がＹＡＧ等の黄色蛍光体である例について説明したが、本発明はこれに限定されない。   In the above embodiment, an example in which the excitation light source 14 is a semiconductor laser light source such as a laser diode (emission wavelength: about 430 to 460 nm) and the wavelength conversion member 18 is a yellow phosphor such as YAG has been described. It is not limited to.

例えば、励起光源１４が近紫外波長（２００〜４００ｎｍ）の半導体レーザー光源、波長変換部材１８が赤緑青３色が混合された蛍光体であってもよい。   For example, the excitation light source 14 may be a semiconductor laser light source having a near ultraviolet wavelength (200 to 400 nm), and the wavelength conversion member 18 may be a phosphor in which three colors of red, green, and blue are mixed.

また、上記実施形態では、発光装置１０を用いてプロジェクタ型の車両用灯具ユニットを構成する例について説明したが、本発明はこれに限定されない。例えば、発光装置１０を用いて、リフレクタ型（反射型）の車両用灯具ユニット、ダイレクトプロジェクション型（直射型）の車両用灯具ユニットを構成してもよい。また、車両用灯具ユニットに限られず、発光装置１０を用いて、表示装置、照明器具、ディスプレイ、液晶ディスプレイのバックライト光源、プロジェクタ装置、レーザディスプレイ、内視鏡等を構成してもよい。   Moreover, although the said embodiment demonstrated the example which comprises a projector-type vehicle lamp unit using the light-emitting device 10, this invention is not limited to this. For example, the light emitting device 10 may be used to constitute a reflector type (reflective) vehicle lamp unit or a direct projection type (direct-light type) vehicle lamp unit. Further, the present invention is not limited to the vehicle lamp unit, and the light emitting device 10 may be used to configure a display device, a lighting fixture, a display, a backlight light source of a liquid crystal display, a projector device, a laser display, an endoscope, and the like.

また、上記実施形態では、レンズ１６を含む発光装置１０を用いて車両用灯具ユニットを構成する例について説明したが、本発明はこれに限定されない。例えば、励起光源１４を波長変換部材１８近傍に配置し、レンズ１６を省略してもよい。   Moreover, although the said embodiment demonstrated the example which comprises a vehicle lamp unit using the light-emitting device 10 containing the lens 16, this invention is not limited to this. For example, the excitation light source 14 may be disposed near the wavelength conversion member 18 and the lens 16 may be omitted.

このようにしても、上記実施形態と同様の効果を奏することが可能となる。   Even if it does in this way, it will become possible to show an effect similar to the above-mentioned embodiment.

上記実施形態はあらゆる点で単なる例示にすぎない。これらの記載によって本発明は限定的に解釈されるものではない。本発明はその精神または主要な特徴から逸脱することなく他の様々な形で実施することができる。   The above embodiment is merely an example in all respects. The present invention is not construed as being limited to these descriptions. The present invention can be implemented in various other forms without departing from the spirit or main features thereof.

１０、１０Ａ…発光装置、１２…ホルダー、１４…励起光源、１６、１６Ａ…レンズ、１８…波長変換部材、１８ａ…上面、２０…ホルダー本体、２２…波長変換部材保持部、２４…ペルチェ素子、２６…放熱部材、２８…第１保持部、２８ａ…第１開口、３０…第２保持部、３０ａ…第２開口、３２…底面、３４…反射面、３６Ａ、３６Ｂ…車両用灯具ユニット、３８…投影レンズ、４０…反射面、４２…シェード   DESCRIPTION OF SYMBOLS 10, 10A ... Light-emitting device, 12 ... Holder, 14 ... Excitation light source, 16, 16A ... Lens, 18 ... Wavelength conversion member, 18a ... Upper surface, 20 ... Holder main body, 22 ... Wavelength conversion member holding part, 24 ... Peltier device, 26 ... Radiating member, 28 ... First holding portion, 28a ... First opening, 30 ... Second holding portion, 30a ... Second opening, 32 ... Bottom surface, 34 ... Reflecting surface, 36A, 36B ... Vehicle lamp unit, 38 ... projection lens, 40 ... reflection surface, 42 ... shade

Claims (4)

励起光を吸収し、波長変換して所定の波長域の光を放出する波長変換部材と、
前記波長変換部材を保持する波長変換部材保持部と、
励起光源と、
前記励起光源からの励起光を集光して前記波長変換部材保持部に保持された前記波長変換部材に照射するレンズと、
を備えており、
前記波長変換部材保持部は、前記レンズで集光された前記励起光源からの励起光が通過する位置に第１開口が形成された第１保持部と、前記第１開口を通過した前記レンズにより集光された前記励起光源からの励起光が通過する位置に第２開口が形成された第２保持部と、を含んでおり、
前記波長変換部材は、前記第１保持部と前記第２保持部との間に保持されており、
前記波長変換部材のうち、前記レンズで集光された前記励起光源からの励起光の照射方向に交差する方向に位置する部分が、光取り出し部とされ、
前記レンズの焦点は、前記第２開口近傍に設定されており、
前記第２開口は、前記第１開口より小サイズとされていることを特徴とする発光装置。 A wavelength conversion member that absorbs excitation light, converts the wavelength, and emits light in a predetermined wavelength range;
A wavelength conversion member holding part for holding the wavelength conversion member;
An excitation light source;
A lens that collects the excitation light from the excitation light source and irradiates the wavelength conversion member held by the wavelength conversion member holding unit;
With
The wavelength conversion member holding portion includes a first holding portion in which a first opening is formed at a position where excitation light from the excitation light source condensed by the lens passes, and the lens that has passed through the first opening. A second holding part having a second opening formed at a position through which the excitation light from the condensed excitation light source passes,
The wavelength conversion member is held between the first holding part and the second holding part,
Of the wavelength conversion member, a portion located in a direction intersecting the irradiation direction of the excitation light from the excitation light source condensed by the lens is a light extraction unit ,
The focal point of the lens is set in the vicinity of the second aperture,
The light emitting device according to claim 1, wherein the second opening is smaller in size than the first opening . 請求項１に記載の発光装置と、
前記光取り出し部からの光を車両前方に照射して所定配光パターンを形成するように構成された光学系と、
を備えることを特徴とする車両用灯具。 A light emitting device according to claim 1 ;
An optical system configured to irradiate light from the light extraction unit forward of the vehicle to form a predetermined light distribution pattern;
A vehicular lamp characterized by comprising: 請求項２に記載の車両用灯具であって、The vehicular lamp according to claim 2,
前記光学系は、前記光取り出し部から放出された光を反射する反射面を備え、The optical system includes a reflective surface that reflects light emitted from the light extraction unit,
前記反射面は、前記レンズで集光された前記励起光源からの励起光の反射方向に交差する方向に位置し、前記光取り出し部を覆っていることを特徴とする車両用灯具。The vehicular lamp, wherein the reflection surface is positioned in a direction intersecting a reflection direction of excitation light from the excitation light source collected by the lens and covers the light extraction portion. 請求項２又は３に記載の車両用灯具であって、The vehicular lamp according to claim 2 or 3,
前記レンズで集光された前記励起光源からの励起光の照射方向には、前記第２開口の前記第１開口と反対側に遮光部材もしくは受光センサを備えることを特徴とする車両用灯具。A vehicular lamp, comprising: a light shielding member or a light receiving sensor on a side opposite to the first opening of the second opening in the irradiation direction of the excitation light from the excitation light source condensed by the lens.
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