JP5994537B2 - Luminescent bulb and vehicle lamp - Google Patents

Luminescent bulb and vehicle lamp Download PDF

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JP5994537B2
JP5994537B2 JP2012216385A JP2012216385A JP5994537B2 JP 5994537 B2 JP5994537 B2 JP 5994537B2 JP 2012216385 A JP2012216385 A JP 2012216385A JP 2012216385 A JP2012216385 A JP 2012216385A JP 5994537 B2 JP5994537 B2 JP 5994537B2
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light
lens
semiconductor laser
laser element
translucent member
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JP2014072010A (en
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須永　義則
義則 須永
寛史 坂口
寛史 坂口
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Hitachi Metals Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/16—Laser light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/176—Light sources where the light is generated by photoluminescent material spaced from a primary light generating element

Description

本発明は、半導体レーザ素子を備えた発光バルブ、及びこの発光バルブを備えた車両用灯具に関する。   The present invention relates to a light-emitting bulb provided with a semiconductor laser element, and a vehicular lamp provided with the light-emitting bulb.

従来、例えば車両の前照灯に用いられるＬＥＤ（Light Emitting Diode）を光源としたＬＥＤバルブが知られている（特許文献１参照）。   Conventionally, for example, an LED bulb using a light emitting diode (LED) used for a vehicle headlamp as a light source is known (see Patent Document 1).

特許文献１に記載のＬＥＤバルブは、既存のフィラメントバルブとの互換性を確保するように構成され、熱伝導性を有する材料からなる円筒状のバルブ本体と、このバルブ本体の一端部に配設され、発光面から指向性を有した光を発するパワーＬＥＤ等のＬＥＤ発光体素子と、ＬＥＤ発光体素子からの出射光を反射する反射部材と、反射部材をバルブ本体に連結する複数の支柱と、反射部材に設けられた第１ヒートシンクと、バルブ本体の他端部に設けられた第２ヒートシンクとを備えている。   The LED bulb described in Patent Document 1 is configured to ensure compatibility with existing filament bulbs, and is provided at a cylindrical bulb body made of a material having thermal conductivity and at one end of the bulb body. An LED light emitter element such as a power LED that emits light having directivity from the light emitting surface, a reflective member that reflects light emitted from the LED light emitter element, and a plurality of pillars that connect the reflective member to the bulb body And a first heat sink provided on the reflecting member, and a second heat sink provided on the other end of the valve body.

反射部材は、フィラメントバルブを装着可能な前照灯のソケット部に、フィラメントバルブに替えてＬＥＤバルブを装着した場合の光の出射方向が、フィラメントバルブの光の出射方向と略同じになるように、ＬＥＤ発光体素子の発光面に向かって突出する円錐状に形成されている。ＬＥＤ発光体素子から出射された光は、反射部材の反射面で反射し、凹状反射鏡の内面でさらに反射して車両の前方を照射する。ＬＥＤ発光体素子で発生する熱は、複数の支柱及び反射部材に伝導して第１ヒートシンクから放熱されると共に、バルブ本体を伝導して第２ヒートシンクから放熱される。   The reflecting member is arranged so that the light emission direction when the LED bulb is attached to the socket portion of the headlamp to which the filament bulb can be attached is substantially the same as the light emission direction of the filament bulb. The LED light emitter element is formed in a conical shape protruding toward the light emitting surface. The light emitted from the LED light emitting element is reflected by the reflecting surface of the reflecting member and further reflected by the inner surface of the concave reflecting mirror to irradiate the front of the vehicle. The heat generated in the LED light emitter element is conducted to the plurality of support columns and the reflecting member and is radiated from the first heat sink, and is conducted from the bulb body to be radiated from the second heat sink.

特開２０１１−２１０６９５号公報JP 2011-210695A

車両の前照灯は、その発光色が白色であることが定められており（「道路運送車両の保安基準」参照）、この基準に適合すべく、例えば青色の光を発するＬＥＤの出射光と、この出射光によって励起される蛍光体が発する黄色光との混色により、白色の発光を得ることが行われている。また、紫色の光又は紫外光を発するＬＥＤの出射光によって励起され、赤・青・緑の蛍光を発する３種の蛍光体を用いて白色の発光を得る場合もある。このような白色光を発するＬＥＤバルブは、車両の前照灯のみならず、例えば室内の照明等にも広く用いられるようになっている。   Vehicle headlamps are stipulated to emit white light (see “Safety Standards for Road Transport Vehicles”), and in order to comply with this standard, for example, emitted light from an LED emitting blue light A white light emission is obtained by mixing with yellow light emitted from a phosphor excited by the emitted light. In some cases, white light emission may be obtained using three kinds of phosphors that are excited by light emitted from LEDs emitting purple light or ultraviolet light and emit red, blue, and green fluorescence. Such LED bulbs that emit white light are widely used not only for vehicle headlamps but also for indoor lighting, for example.

このようなＬＥＤバルブに用いられる蛍光体は、高温状態におかれると、特性が劣化して蛍光が弱くなることがある。蛍光体の特性が劣化すると、使用開始当初は白色光を発していても、長時間の使用によって色味が変化してしまう。   When the phosphor used in such an LED bulb is placed in a high temperature state, the characteristics may deteriorate and the fluorescence may weaken. When the characteristics of the phosphor are deteriorated, even if white light is emitted at the beginning of use, the color changes due to long-term use.

特許文献１に記載のＬＥＤバルブでは、ＬＥＤ発光体素子として光量の大きなパワーＬＥＤが用いられているが、このようなパワーＬＥＤでは、半導体発光素子と蛍光体を含む樹脂又はガラスとが近接又は接触して配置されたものが一般的である。このため、半導体発光素子が発する熱によって蛍光体が高熱となり、その特性が劣化するおそれがあった。また、ハイパワーなＬＥＤを棒状のヒートシンクの先端に置いただけでは、その放熱性が不十分であり、半導体発光素子の発光効率が低下するとともに寿命が短くなってしまうおそれがあった。   In the LED bulb described in Patent Document 1, a power LED having a large amount of light is used as an LED light emitter element. In such a power LED, a semiconductor light emitting element and a resin or glass containing a phosphor are close to or in contact with each other. Are generally arranged. For this reason, the phosphor is heated by heat generated by the semiconductor light emitting element, and there is a possibility that the characteristics of the phosphor deteriorate. Further, if a high-power LED is simply placed at the tip of a rod-shaped heat sink, the heat dissipation property is insufficient, and the light emission efficiency of the semiconductor light emitting element may be lowered and the lifetime may be shortened.

そこで、本発明は、半導体レーザ素子を光源として備え、この半導体レーザ素子の光によって励起される蛍光体の熱による特性の劣化、及び半導体レーザ素子自身の熱による半導体レーザ素子の劣化を抑制することが可能な発光バルブ及び車両用灯具を提供することを目的とする。   Therefore, the present invention includes a semiconductor laser element as a light source, and suppresses deterioration of characteristics of the phosphor excited by light of the semiconductor laser element due to heat and deterioration of the semiconductor laser element due to heat of the semiconductor laser element itself. An object of the present invention is to provide a light emitting bulb and a vehicular lamp that can be used.

本発明は、上記課題を解決することを目的として、半導体レーザ素子と、前記半導体レーザ素子が発する光の配光角を絞るレンズと、前記レンズを通過した前記半導体レーザ素子の光を励起光として蛍光を発する蛍光体を含む透光性部材と、前記半導体レーザ素子を支持する支持部、及び前記支持部から前記半導体レーザ素子の熱を放熱する放熱部を有する基台と、前記レンズの光軸に沿って配置され、前記透光性部材を前記半導体レーザ素子から離間させて前記基台に支持する支持部材とを備えた発光バルブを提供する。   In order to solve the above problems, the present invention provides a semiconductor laser element, a lens for narrowing a light distribution angle of light emitted from the semiconductor laser element, and light from the semiconductor laser element that has passed through the lens as excitation light. A translucent member including a fluorescent material that emits fluorescence; a support part that supports the semiconductor laser element; a base that includes a heat dissipation part that dissipates heat of the semiconductor laser element from the support part; and an optical axis of the lens The light emitting bulb is provided with a supporting member that is disposed along the support member and that supports the light-transmitting member on the base while being spaced apart from the semiconductor laser element.

また、前記透光性部材には、前記レンズの光軸に沿って前記半導体レーザ素子の光を導入する空間が形成されているとよい。   Further, the light transmissive member may be formed with a space for introducing light of the semiconductor laser element along the optical axis of the lens.

また、前記透光性部材は、前記レンズから離れるにつれてテーパ状に前記空間の内径が縮小する領域を含むとよい。   The translucent member may include a region in which the inner diameter of the space decreases in a tapered shape as the distance from the lens increases.

また、前記透光性部材は、有底筒状に形成され、前記透光性部材の底部における外面に反射面を接触させて配置された反射部材をさらに備えるとよい。   Moreover, the said translucent member is good to further be provided with the reflecting member formed in the shape of a bottomed cylinder, and arrange | positioning a reflecting surface in contact with the outer surface in the bottom part of the said translucent member.

また、前記透光性部材の前記空間に配置され、前記レンズの光軸に対して傾斜した反射面を有し、前記レンズを通過した前記半導体レーザ素子の光を前記空間の内面に反射する反射部材をさらに備えるとよい。   A reflection member disposed in the space of the translucent member, having a reflection surface inclined with respect to the optical axis of the lens, and reflecting light of the semiconductor laser element that has passed through the lens to an inner surface of the space; It is good to further provide a member.

また、前記反射部材には、前記反射面が前記レンズの光軸に沿って離間した複数箇所に形成されているとよい。   Further, the reflecting member may be formed with a plurality of reflecting surfaces separated along the optical axis of the lens.

また、本発明は、上記課題を解決することを目的として、前記発光バルブと、前記発光バルブの前記基台が奥部に取り付けられる凹面反射鏡とを備えた車両用灯具を提供する。   Moreover, this invention provides the vehicle lamp provided with the said light-emitting bulb and the concave reflecting mirror to which the said base of the said light-emitting bulb is attached to the back part for the purpose of solving the said subject.

本発明に係る発光バルブ及び車両用灯具によれば、半導体レーザ素子の光によって励起される蛍光体の熱による特性の劣化を抑制することが可能となる。   According to the light emitting bulb and the vehicular lamp according to the present invention, it is possible to suppress deterioration of characteristics due to heat of the phosphor excited by light of the semiconductor laser element.

本発明の第１の実施の形態に係る発光バルブ、及びこの発光バルブを備えた車両用灯具としてのヘッドライトの構成例を示す断面図である。It is sectional drawing which shows the structural example of the light-emitting bulb which concerns on the 1st Embodiment of this invention, and the headlight as a vehicle lamp provided with this light-emitting bulb. 発光バルブの構成例を示す断面図である。It is sectional drawing which shows the structural example of a light emission bulb | ball. 透光性部材を示し、（ａ）は斜視図、（ｂ）は下面図、（ｃ）は中心軸に沿った断面図である。The translucent member is shown, (a) is a perspective view, (b) is a bottom view, and (c) is a cross-sectional view along the central axis. ハロゲンバルブを示す概略図である。It is the schematic which shows a halogen bulb. 比較例として示す透光性部材を示す断面図である。It is sectional drawing which shows the translucent member shown as a comparative example. 第２の実施の形態に係る発光バルブを示す断面図である。It is sectional drawing which shows the light emission bulb | bulb which concerns on 2nd Embodiment. 第３の実施の形態に係る発光バルブを示し、（ａ）は全体断面図、（ｂ）は透光性部材及び反射部材の拡大図である。The light emission bulb | bulb which concerns on 3rd Embodiment is shown, (a) is whole sectional drawing, (b) is an enlarged view of a translucent member and a reflection member. 第４の実施の形態に係る発光バルブを示し、（ａ）は全体断面図、（ｂ）は透光性部材及び反射部材の拡大図である。The light emission bulb | bulb which concerns on 4th Embodiment is shown, (a) is whole sectional drawing, (b) is an enlarged view of a translucent member and a reflection member.

［第１の実施の形態］
図１は、本発明の第１の実施の形態に係る発光バルブ、及びこの発光バルブを備えた車両用灯具としてのヘッドライトの構成例を示す断面図である。図２は、発光バルブの構成例を示す断面図である。 [First Embodiment]
FIG. 1 is a cross-sectional view showing a configuration example of a light emitting bulb according to a first embodiment of the present invention and a headlight as a vehicular lamp including the light emitting bulb. FIG. 2 is a cross-sectional view illustrating a configuration example of a light emitting bulb.

（ヘッドライトの構成）
ヘッドライト１は、発光バルブ１０と、凹面反射鏡１１と、アウタレンズ１２と、放熱板１３とを備えている。このヘッドライト１は、車両の前照灯として用いられ、発光バルブ１０の発光部１００から放射された光を凹面反射鏡１１の反射面１１ａによってアウタレンズ１２側に反射し、車両の前方を照射する。 (Headlight structure)
The headlight 1 includes a light emitting bulb 10, a concave reflecting mirror 11, an outer lens 12, and a heat radiating plate 13. The headlight 1 is used as a headlamp of a vehicle, reflects light emitted from the light emitting unit 100 of the light emitting bulb 10 to the outer lens 12 side by the reflecting surface 11a of the concave reflecting mirror 11, and irradiates the front of the vehicle. .

発光バルブ１０は、凹面反射鏡１１の奥部１１０に形成された挿通孔１１１を挿通して、発光部１００を含む一端部が凹面反射鏡１１の内部に挿入される。発光バルブ１０の他端部は、放熱板１３に接触した状態で固定される。放熱板１３は、発光バルブ１０の熱を例えば車体（図示せず）に熱伝導させて放熱する。発光部１００は、凹面反射鏡１１の奥部１１０からの距離がｄ１からｄ２の範囲に亘って配置される。 The light emitting bulb 10 is inserted through the insertion hole 111 formed in the back part 110 of the concave reflecting mirror 11, and one end including the light emitting part 100 is inserted into the concave reflecting mirror 11. The other end of the light emitting bulb 10 is fixed in contact with the heat radiating plate 13. The heat radiating plate 13 radiates heat by conducting heat of the light emitting bulb 10 to, for example, a vehicle body (not shown). The light emitting unit 100 is arranged so that the distance from the back part 110 of the concave reflecting mirror 11 ranges from d 1 to d 2 .

（発光バルブの構成）
図２に示すように、発光バルブ１０は、複数の半導体レーザ素子２０と、半導体レーザ素子２０が発する光の配光角を絞るレンズ３と、レンズ３を通過した半導体レーザ素子２０の光を励起光として蛍光を発する蛍光体４ａを含む透光性部材４と、半導体レーザ素子２０を支持する支持部５１、及び支持部５１から半導体レーザ素子２０の熱を放熱する放熱部５２を有する基台５と、レンズ３の光軸Ｌに沿って配置され、透光性部材４を半導体レーザ素子２０から離間させて基台５に支持する支持部材６と、透光性部材４の外面に配置された反射部材７とを備えている。 (Configuration of luminous bulb)
As shown in FIG. 2, the light emitting bulb 10 excites a plurality of semiconductor laser elements 20, a lens 3 for narrowing a light distribution angle of light emitted from the semiconductor laser elements 20, and light of the semiconductor laser element 20 that has passed through the lens 3. A base 5 having a translucent member 4 including a phosphor 4a that emits fluorescence as light, a support 51 that supports the semiconductor laser element 20, and a heat dissipation part 52 that dissipates heat of the semiconductor laser element 20 from the support 51. And a support member 6 that is disposed along the optical axis L of the lens 3 and is spaced from the semiconductor laser element 20 and supported by the base 5, and is disposed on the outer surface of the translucent member 4. And a reflection member 7.

半導体レーザ素子２０は、例えばピーク波長が４３０ｎｍ以上４７０ｎｍ以下である青色の光を発するレーザダイオードである。この半導体レーザ素子２０は、基台５に立設された電極５３から電流の供給を受け、レンズ３に向かって青色のレーザ光を出射する。本実施の形態では、複数の半導体レーザ素子２０によって光源２が構成されている。ただし、必要な光量が得られるのであれば、単一の半導体レーザ素子２０によって光源２を構成してもよい。   The semiconductor laser element 20 is a laser diode that emits blue light having a peak wavelength of, for example, 430 nm or more and 470 nm or less. The semiconductor laser element 20 is supplied with a current from an electrode 53 erected on the base 5 and emits blue laser light toward the lens 3. In the present embodiment, the light source 2 is constituted by a plurality of semiconductor laser elements 20. However, the light source 2 may be constituted by the single semiconductor laser element 20 as long as the necessary light quantity can be obtained.

レンズ３は、ガラスや樹脂等の透光性を有する材料からなる凸レンズであり、光源２と透光性部材４との間に配置されている。本実施の形態では、基台５に固定された環状支持部材５４によってレンズ３が支持されている。レンズ３は、環状支持部材５４の中心部における窓部５４０を通過した半導体レーザ素子２０の光を入射し、光軸Ｌ上の焦点に向かって集光する。図２では、レンズ３の前後における光束の外縁を二点鎖線で示している。   The lens 3 is a convex lens made of a translucent material such as glass or resin, and is disposed between the light source 2 and the translucent member 4. In the present embodiment, the lens 3 is supported by the annular support member 54 fixed to the base 5. The lens 3 receives the light of the semiconductor laser element 20 that has passed through the window 540 at the center of the annular support member 54 and collects the light toward the focal point on the optical axis L. In FIG. 2, the outer edge of the light beam before and after the lens 3 is indicated by a two-dot chain line.

透光性部材４は、有底筒状の本体部４１と、本体部４１の外周面４１ａから外方に突出した環状の鍔部４２とを一体に有している。本実施の形態では、透光性部材４が蛍光体４ａと共に光拡散材４ｂを含み、蛍光体４ａ及び光拡散材４ｂが透光性の基材４ｃ中に分散している。透光性部材４は、例えば基材４ｃとなるガラス粉末に粉状の蛍光体４ａ及び光拡散材４ｂを混合して焼成することにより得ることができる。蛍光体４ａとしては、青色の光を受けて黄色の蛍光を発するＹＡＧ（イットリウム・アルミニウム・ガーネット）系の蛍光体を用いることができる。光拡散材４ｂとしては、例えば粒子状の二酸化ケイ素やセラミック等を用いることができる。なお、図２では、説明のため、蛍光体４ａ及び光拡散材４ｂの大きさを誇張して示している。   The translucent member 4 integrally includes a bottomed cylindrical main body 41 and an annular flange 42 protruding outward from the outer peripheral surface 41 a of the main body 41. In the present embodiment, translucent member 4 includes light diffusing material 4b together with phosphor 4a, and phosphor 4a and light diffusing material 4b are dispersed in translucent substrate 4c. The translucent member 4 can be obtained, for example, by mixing and baking a powdery phosphor 4a and a light diffusing material 4b in a glass powder to be a base material 4c. As the phosphor 4a, a YAG (yttrium, aluminum, garnet) phosphor that emits yellow fluorescence when receiving blue light can be used. As the light diffusing material 4b, for example, particulate silicon dioxide or ceramic can be used. In FIG. 2, the sizes of the phosphor 4a and the light diffusing material 4b are exaggerated for explanation.

基台５は、例えばアルミニウム等の熱伝導性に優れた金属からなり、支持部５１と放熱部５２とを一体に有している。支持部５１は、レンズ３の光軸Ｌに中心軸が一致するように形成された柱状であり、その外周に複数の半導体レーザ素子２０が固定されている。放熱部５２は、支持部５１よりも大径の円盤状であり、その底面５１ａから一対の電源端子５５が突出している。より詳細には、放熱部５２は、支持部５１側の小径部５２１及び電源端子５５側の大径部５２２からなり、小径部５２１と大径部５２２との境目には段差部５２３が形成されている。   The base 5 is made of a metal having excellent thermal conductivity such as aluminum, for example, and integrally includes a support portion 51 and a heat radiating portion 52. The support portion 51 has a columnar shape formed so that the central axis coincides with the optical axis L of the lens 3, and a plurality of semiconductor laser elements 20 are fixed to the outer periphery thereof. The heat dissipating part 52 has a disk shape larger in diameter than the support part 51, and a pair of power supply terminals 55 protrudes from the bottom surface 51a. More specifically, the heat radiating portion 52 includes a small diameter portion 521 on the support portion 51 side and a large diameter portion 522 on the power supply terminal 55 side, and a step portion 523 is formed at the boundary between the small diameter portion 521 and the large diameter portion 522. ing.

小径部５２１の上面５２１ａ（支持部５１側の面）には、複数の電極５３が立設されると共に、環状支持部材５４が固定されている。大径部５２２の外周面５２２ａは、放熱板１３に接触している。なお、大径部５２２の外周面５２２ａと放熱板１３との間に熱伝導率の高い熱伝達部材を介在させてもよい。つまり、大径部５２２から放熱板１３に熱が伝わるように熱的に結合されていればよい。   A plurality of electrodes 53 are erected on the upper surface 521a (surface on the support portion 51 side) of the small diameter portion 521, and an annular support member 54 is fixed. An outer peripheral surface 522 a of the large diameter portion 522 is in contact with the heat sink 13. A heat transfer member having a high thermal conductivity may be interposed between the outer peripheral surface 522a of the large diameter portion 522 and the heat radiating plate 13. That is, it is only necessary to be thermally coupled so that heat is transmitted from the large diameter portion 522 to the heat radiating plate 13.

支持部５１は、半導体レーザ素子２０で発生した熱を吸収し、半導体レーザ素子２０の過熱を抑制する。支持部５１で吸収された熱は、放熱部５２に熱伝導し、さらに放熱部５２から放熱板１３に熱伝導して放熱される。   The support part 51 absorbs heat generated in the semiconductor laser element 20 and suppresses overheating of the semiconductor laser element 20. The heat absorbed by the support portion 51 is thermally conducted to the heat radiating portion 52, and is further conducted from the heat radiating portion 52 to the heat radiating plate 13 to be radiated.

支持部材６は、中空の円筒状であり、例えばアルミニウム等の金属からなる。支持部材６は、その一端部が基台５の段差部５２３に例えば溶接によって固定され、他端部には透光性部材４の鍔部４２が例えば加締めによって取り付けられている。支持部材６の一端部は放熱板１３に接している。図２に示す例では、支持部材６の外径及び内径が一端部から他端部に向かって徐々に縮径しているが、支持部材６の外径及び内径は均一であってもよい。また、複数の棒状の支持部材によって透光性部材４を基台５に支持してもよい。   The support member 6 has a hollow cylindrical shape and is made of a metal such as aluminum. One end of the support member 6 is fixed to the step portion 523 of the base 5 by, for example, welding, and the flange portion 42 of the translucent member 4 is attached to the other end by, for example, caulking. One end of the support member 6 is in contact with the heat sink 13. In the example shown in FIG. 2, the outer diameter and inner diameter of the support member 6 are gradually reduced from one end to the other end, but the outer diameter and inner diameter of the support member 6 may be uniform. Further, the translucent member 4 may be supported on the base 5 by a plurality of rod-shaped support members.

反射部材７は、鏡面加工された反射面７ａを有するアルミニウムやステンレス鋼等の金属板からなる。この反射部材７は、レンズ３の光軸Ｌに沿って直進する光がそのままヘッドライト１の外部に放射されることを防止している。   The reflecting member 7 is made of a metal plate such as aluminum or stainless steel having a mirror-finished reflecting surface 7a. The reflecting member 7 prevents light traveling straight along the optical axis L of the lens 3 from being radiated to the outside of the headlight 1 as it is.

（透光性部材の構成）
次に、透光性部材４の詳細な構成について図３を参照して説明する。図３は、透光性部材４を示し、（ａ）は斜視図、（ｂ）は下面図、（ｃ）は中心軸Ｃに沿った断面図である。 (Configuration of translucent member)
Next, the detailed structure of the translucent member 4 will be described with reference to FIG. FIG. 3 shows the translucent member 4, where (a) is a perspective view, (b) is a bottom view, and (c) is a cross-sectional view along the central axis C.

図３（ｃ）に示すように、有底円筒状の本体部４１は、底部４１０、第１筒部４１１、及び第２筒部４１２によって構成されている。第２筒部４１２はレンズ３側に配置され、第２筒部４１２と底部４１０との間に第１筒部４１１が形成されている。第１筒部４１１及び第２筒部４１２の中心部には、レンズ３の光軸Ｌに沿って光源２の光を導入する空間４０が形成されている。蛍光体４ａは、この空間４０に導入された光源２の光を励起光として、光源２の光とは異なる波長の蛍光（黄色光）を発する。   As shown in FIG. 3C, the bottomed cylindrical main body 41 includes a bottom portion 410, a first tube portion 411, and a second tube portion 412. The second cylinder part 412 is disposed on the lens 3 side, and a first cylinder part 411 is formed between the second cylinder part 412 and the bottom part 410. A space 40 for introducing the light of the light source 2 along the optical axis L of the lens 3 is formed at the center of the first tube portion 411 and the second tube portion 412. The phosphor 4a emits fluorescence (yellow light) having a wavelength different from that of the light of the light source 2 using the light of the light source 2 introduced into the space 40 as excitation light.

第１筒部４１１における空間４０の内面４０ａは、底部４１０に向かうにつれて、すなわちレンズ３から離れるにつれて、テーパ状に内径が縮小する円錐内面として形成されている。つまり、第１筒部４１１は、レンズ３から離れるにつれて内径がテーパ状に縮小する筒状の領域として形成されている。第２筒部４１２における空間４０の内面は、内径が均一な円筒内面として形成されている。   The inner surface 40a of the space 40 in the first cylindrical portion 411 is formed as a conical inner surface whose inner diameter decreases in a tapered shape toward the bottom portion 410, that is, away from the lens 3. That is, the first cylindrical portion 411 is formed as a cylindrical region whose inner diameter decreases in a tapered shape as the distance from the lens 3 increases. The inner surface of the space 40 in the second cylindrical portion 412 is formed as a cylindrical inner surface having a uniform inner diameter.

鍔部４２は、第２筒部４１２における第１筒部４１１とは反対側の端部に形成されている。鍔部４２には、レンズ３側を小径とする段部４２１が設けられ、この段部４２１に支持部材６が嵌合する。透光性部材４は、その中心軸Ｃがレンズ３の光軸Ｌと一致するように、支持部材６によって支持される。   The collar portion 42 is formed at the end of the second cylinder portion 412 opposite to the first cylinder portion 411. The collar portion 42 is provided with a step portion 421 having a small diameter on the lens 3 side, and the support member 6 is fitted to the step portion 421. The translucent member 4 is supported by the support member 6 so that the central axis C thereof coincides with the optical axis L of the lens 3.

レンズ３によって集光された光源２の光は、主として空間４０の内面４０ａから透光性部材４に入射する。透光性部材４に入射した光の一部は蛍光体４ａに当たって蛍光体４ａを励起する。また、透光性部材４に入射した光の他の一部は光拡散材４ｂに当たって拡散される。光拡散材４ｂによって拡散された光の一部は蛍光体４ａに当たり、他の一部は本体部４１の外周面４１ａから透光性部材４の外部に放射される。   The light of the light source 2 collected by the lens 3 is incident on the translucent member 4 mainly from the inner surface 40 a of the space 40. Part of the light incident on the translucent member 4 strikes the phosphor 4a and excites the phosphor 4a. Further, another part of the light incident on the translucent member 4 strikes the light diffusing material 4b and is diffused. Part of the light diffused by the light diffusing material 4 b hits the phosphor 4 a, and the other part is radiated from the outer peripheral surface 41 a of the main body 41 to the outside of the translucent member 4.

底部４１０における透光性部材４の外面４１０ａは、中心軸Ｃに対して直交する平坦な面として形成されている。反射部材７（図２に示す）は、外面４１０ａに反射面７ａを接触させて配置されている。反射部材７は、外面４１０ａから出射する方向の光を反射面７ａによって透光性部材４の内部に反射する。   The outer surface 410 a of the translucent member 4 at the bottom 410 is formed as a flat surface orthogonal to the central axis C. The reflecting member 7 (shown in FIG. 2) is arranged with the reflecting surface 7a in contact with the outer surface 410a. The reflecting member 7 reflects light in the direction emitted from the outer surface 410a to the inside of the translucent member 4 by the reflecting surface 7a.

透光性部材４は、蛍光体４ａによって波長変換された黄色光、及び蛍光体４ａによって波長変換されていない青色光（半導体レーザ素子２０の発光光）を本体部４１の外周面４１ａから放射する。黄色と青色とは、互いに補色関係にあるので、黄色光と青色光の混色により、白色光が得られる。すなわち、透光性部材４は発光バルブ１０の発光部１００（図１に示す）として機能し、その透光性部材４から放射された白色光が凹面反射鏡１１の反射面１１ａで反射してアウタレンズ１２から出射される。   The translucent member 4 emits yellow light whose wavelength has been converted by the phosphor 4 a and blue light (the light emitted from the semiconductor laser element 20) which has not been wavelength-converted by the phosphor 4 a from the outer peripheral surface 41 a of the main body 41. . Since yellow and blue are complementary to each other, white light can be obtained by mixing yellow light and blue light. That is, the translucent member 4 functions as the light emitting unit 100 (shown in FIG. 1) of the light emitting bulb 10, and the white light emitted from the translucent member 4 is reflected by the reflecting surface 11 a of the concave reflecting mirror 11. The light is emitted from the outer lens 12.

図４は、従来のヘッドランプに広く用いられるハロゲンバルブ（Ｈ−７バルブ）８を示す概略図である。   FIG. 4 is a schematic diagram showing a halogen bulb (H-7 bulb) 8 widely used in conventional headlamps.

ハロゲンバルブ８は、口金８１と、中空筒状のガラス殻８２と、ガラス殻８２の頂部に設けられたシェード（遮光部）８３と、発光部としてのフィラメント８４と、一対の電源端子８５と、ステム８６とを備えている。フィラメント８４は、単コイルまたは二重コイルからなり、ガラス殻８２の中心軸に沿って線状に配置されている。   The halogen bulb 8 includes a base 81, a hollow cylindrical glass shell 82, a shade (light shielding portion) 83 provided on the top of the glass shell 82, a filament 84 as a light emitting portion, a pair of power terminals 85, Stem 86. The filament 84 is composed of a single coil or a double coil, and is arranged linearly along the central axis of the glass shell 82.

本実施の形態に係る発光バルブ１０は、凹面反射鏡１１の奥部１１０にハロゲンバルブ８を取り付けた際にフィラメント８４が位置する部位に透光性部材４（発光部１００）の少なくとも一部が配置されるように構成されている。つまり、凹面反射鏡１１にハロゲンバルブ８を取り付けた場合には、凹面反射鏡１１の奥部１１０からの距離がｄ１からｄ２の範囲（図１参照）にフィラメント８４の少なくとも一部が配置される。この透光性部材４の位置の調整は、例えば支持部材６の長さを調節することによって可能である。 In the light emitting bulb 10 according to the present embodiment, at least a part of the translucent member 4 (the light emitting unit 100) is located at a portion where the filament 84 is located when the halogen bulb 8 is attached to the back portion 110 of the concave reflecting mirror 11. It is configured to be arranged. That is, when the concave reflector 11 fitted with a halogen bulb 8 is at least partially disposed in the filament 84 in the range distances from d 1 of d 2 from the inner part 110 (see FIG. 1) of the concave reflector 11 Is done. The position of the translucent member 4 can be adjusted, for example, by adjusting the length of the support member 6.

このように発光バルブ１０が構成されていることにより、凹面反射鏡１１としては、ハロゲンバルブ８を適用することを前提に設計された既存構成のものを用いることができる。   Since the light emitting bulb 10 is configured as described above, the concave reflecting mirror 11 having an existing configuration designed on the assumption that the halogen bulb 8 is applied can be used.

（比較例）
図５は、比較例として示す透光性部材９を示す断面図である。 (Comparative example)
FIG. 5 is a cross-sectional view showing a translucent member 9 shown as a comparative example.

この透光性部材９は、中心部に空間が形成されておらず、中実である他は第１の実施の形態に係る透光性部材４と同様に構成されている。透光性部材９は、円柱状の本体部９１と、本体部９１の外周に突出して形成された鍔部９２とを有している。透光性部材９の基材には、透光性部材４と同様に、蛍光体及び光拡散材が分散している。   The translucent member 9 is configured in the same manner as the translucent member 4 according to the first embodiment except that a space is not formed at the center and is solid. The translucent member 9 includes a columnar main body 91 and a flange 92 formed to protrude from the outer periphery of the main body 91. Similar to the translucent member 4, the phosphor and the light diffusing material are dispersed in the base material of the translucent member 9.

この透光性部材９に入射面９ａから青色光Ｌａが入射すると、その入射光は透光性部材９の内部において光拡散材で拡散され、一部は蛍光体に当たって蛍光体を励起する。本体部９１の外周面９１ａから出射される光は、入射面９ａから遠い側における出射光Ｌｂと、比較的入射面９ａに近い側から出射される出射光Ｌｃとの間で、透光性部材９の内部を通過する距離に大きな違いが生じ、これにより色むらが発生する。   When the blue light La is incident on the light transmissive member 9 from the incident surface 9a, the incident light is diffused by the light diffusing material inside the light transmissive member 9, and a part of the light strikes the phosphor to excite the phosphor. The light emitted from the outer peripheral surface 91a of the main body 91 is a translucent member between the emitted light Lb on the side far from the incident surface 9a and the emitted light Lc emitted from the side relatively closer to the incident surface 9a. There is a great difference in the distance that passes through the interior of 9, thereby causing uneven color.

つまり、出射光Ｌｂは、透光性部材９の内部を通過する距離が出射光Ｌｃよりも長いので、蛍光体で波長変換される割合が高くなり、出射光Ｌｃに比較して黄色を帯びることとなる。したがって、この透光性部材９を透光性部材４に替えて発光バルブ１０に適用した場合には、ヘッドライト１の照射位置によって色のばらつきが大きくなる。   That is, since the outgoing light Lb has a longer distance to pass through the inside of the translucent member 9 than the outgoing light Lc, the ratio of wavelength conversion by the phosphor is high, and it is yellowish compared to the outgoing light Lc. It becomes. Therefore, when the translucent member 9 is applied to the light emitting bulb 10 in place of the translucent member 4, color variation increases depending on the irradiation position of the headlight 1.

本実施の形態では、透光性部材４の中心部に空間４０が形成されていることにより、透光性部材４から出射される光が透光性部材４の内部を通過する距離のばらつきが抑制される。つまり、第１筒部４１１における空間４０の内面４０ａから入射した光は、空気の屈折率と透光性部材４の基材４ｃの屈折率との違い（空気の屈折率＜基材４ｃの屈折率）によって屈折し、内面４０ａから外側に向かって広がるように透光性部材４内を進み、本体部４１の外周面４１ａから出射される。したがって、中実に形成された透光性部材９に比較して、出射光における黄色光の割合が均一化され、色むらが抑制される。   In the present embodiment, since the space 40 is formed in the central portion of the translucent member 4, there is a variation in the distance that the light emitted from the translucent member 4 passes through the translucent member 4. It is suppressed. That is, the light incident from the inner surface 40a of the space 40 in the first cylindrical portion 411 is different between the refractive index of air and the refractive index of the base material 4c of the translucent member 4 (the refractive index of air <the refractive index of the base material 4c). The light is refracted by the ratio, travels through the translucent member 4 so as to spread outward from the inner surface 40a, and is emitted from the outer peripheral surface 41a of the main body 41. Therefore, compared with the translucent member 9 formed solid, the ratio of yellow light in the emitted light is made uniform, and color unevenness is suppressed.

（第１の実施の形態の作用及び効果）
本実施の形態によれば、以下に示す作用及び効果が得られる。 (Operation and effect of the first embodiment)
According to the present embodiment, the following operations and effects can be obtained.

（１）透光性部材４は支持部材６によって光源２から離間して支持されているので、光源２における複数の半導体レーザ素子２０で発生した熱が透光性部材４に伝わりにくい。これにより、透光性部材４の温度上昇が抑制され、蛍光体４ａにおける熱による特性の劣化（変換効率の低下）が抑えられる。また、透光性部材４と基台５とを離間させることにより、透光性部材４を凹面反射鏡１１内の適切な位置（ハロゲンバルブ８を取り付けた場合のフィラメント８４に対応する位置）に配置しながら、光源２を放熱板１３に近い位置に配置することができ、基台５による放熱を効率的に行うことができる。またさらに、本実施の形態では、支持部材６の基台５側の一端部が放熱板１３に接しており、支持部材６の温度が放熱板１３よりも高くなることが抑制されるので、より確実に蛍光体４ａの熱による特性の劣化を抑制することが可能となる。 (1) Since the translucent member 4 is supported by being separated from the light source 2 by the support member 6, heat generated by the plurality of semiconductor laser elements 20 in the light source 2 is not easily transmitted to the translucent member 4. Thereby, the temperature rise of the translucent member 4 is suppressed, and deterioration of characteristics (decrease in conversion efficiency) due to heat in the phosphor 4a is suppressed. Further, by separating the translucent member 4 and the base 5, the translucent member 4 is placed at an appropriate position in the concave reflecting mirror 11 (a position corresponding to the filament 84 when the halogen bulb 8 is attached). While being arranged, the light source 2 can be arranged at a position close to the heat radiating plate 13, and the heat radiation by the base 5 can be efficiently performed. Furthermore, in this Embodiment, since the one end part by the side of the base 5 of the support member 6 is in contact with the heat sink 13, it is suppressed that the temperature of the support member 6 becomes higher than the heat sink 13, Therefore It is possible to reliably suppress deterioration of characteristics due to heat of the phosphor 4a.

（２）透光性部材４の中心部に空間４０が形成されているので、上記比較例に係る透光性部材９との対比によって説明したように、出射光の色むらを抑制することが可能となる。なお、本実施の形態では、レンズ３によって光源２の光が集光されるので、光源２と透光性部材４との間が離れても、空間４０の内部に光源２の光を導入することが可能である。 (2) Since the space 40 is formed in the central part of the translucent member 4, as described with reference to the translucent member 9 according to the comparative example, it is possible to suppress uneven color of the emitted light. It becomes possible. In the present embodiment, since the light from the light source 2 is collected by the lens 3, the light from the light source 2 is introduced into the space 40 even if the light source 2 and the translucent member 4 are separated from each other. It is possible.

（３）透光性部材４の空間４０における内面４０ａは、底部４１０に向かうにつれてテーパ状に内径が縮小するので、例えば中心軸Ｃに直交する平坦な面から光が入射する場合に比較して、空間４０の中心軸Ｃ方向に沿って延びる広い範囲にわたって光源２の光を入射することができる。これにより、より多くの蛍光体４ａから蛍光を発生させることができ、一部の蛍光体４ａが集中的に励起されることによって蛍光体４ａの温度が上昇して蛍光が弱くなる温度消光現象の発生を抑制することができる。 (3) The inner surface 40a in the space 40 of the translucent member 4 has a tapered inner diameter that decreases toward the bottom 410, so that, for example, light enters from a flat surface orthogonal to the central axis C. The light from the light source 2 can be incident over a wide range extending along the direction of the central axis C of the space 40. As a result, fluorescence can be generated from a larger number of phosphors 4a, and a temperature quenching phenomenon in which a part of the phosphors 4a is intensively excited to increase the temperature of the phosphors 4a and weaken the fluorescence. Occurrence can be suppressed.

（４）透光性部材４の底部４１０における外面４１０ａには、反射部材７が反射面７ａを接触させて配置されているので、透光性部材４から出射した光が凹面反射鏡１１の反射面１１ａで反射することなくアウタレンズ１２から出射されることを防止できると共に、反射部材７を支持するための支持部材等を設けることなく反射部材７を配置することが可能となる。 (4) Since the reflecting member 7 is disposed on the outer surface 410a of the bottom 410 of the translucent member 4 so that the reflecting surface 7a is in contact, the light emitted from the translucent member 4 is reflected by the concave reflecting mirror 11. The reflection from the outer lens 12 without being reflected by the surface 11a can be prevented, and the reflection member 7 can be arranged without providing a support member or the like for supporting the reflection member 7.

［第２の実施の形態］
次に、本発明の第２の実施の形態について図６を参照して説明する。図６は第２の実施の形態に係る発光バルブ１０Ａを示す断面図である。 [Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 6 is a sectional view showing a light emitting bulb 10A according to the second embodiment.

この発光バルブ１０Ａは、透光性部材４Ａ及び反射部材７Ａの構成が第１の実施の形態に係る透光性部材４及び反射部材７と異なる他は、第１の実施の形態に係る発光バルブ１０と同様に構成されている。図６において、第１の実施の形態について説明したものと同様の機能を有する構成要素については同一の符号を付してその重複した説明を省略する。   This light emitting bulb 10A is the light emitting bulb according to the first embodiment, except that the translucent member 4A and the reflecting member 7A are different from the light transmitting member 4 and the reflecting member 7 according to the first embodiment. 10 is the same. In FIG. 6, components having the same functions as those described in the first embodiment are denoted by the same reference numerals, and redundant description thereof is omitted.

透光性部材４Ａは、本体部４１Ａと鍔部４２Ａとを一体に有している。本体部４１Ａと鍔部４２Ａには、蛍光体４ａ及び光拡散材４ｂが基材４ｃ中に分散して配置されている。本体部４１Ａは、その外形が円錐状であり、中心部には同じく円錐状の空間４０Ａが形成されている。本体部４１Ａにおける空間４０Ａよりも奥側における底部４１０Ａの外面４１０Ａａには、反射部材７Ａの反射面７Ａａが接している。   The translucent member 4A integrally includes a main body portion 41A and a flange portion 42A. In the main body portion 41A and the collar portion 42A, the phosphor 4a and the light diffusing material 4b are dispersed and arranged in the base material 4c. The main body 41A has a conical outer shape, and a conical space 40A is formed at the center. The reflective surface 7Aa of the reflective member 7A is in contact with the outer surface 410Aa of the bottom portion 410A on the back side of the space 40A in the main body portion 41A.

レンズ３を通過した光（図６に二点鎖線で示す）は、空間４０Ａにおける透光性部材４Ａの内面４０Ａａから本体部４１Ａ内に入射し、その一部が蛍光体４ａを励起して蛍光を発生させる。また本体部４１Ａ内に入射した光の一部は直接的に、もしくは光拡散材４ｂに拡散されて、本体部４１Ａの外周面４１Ａａから放射される。   Light that has passed through the lens 3 (indicated by a two-dot chain line in FIG. 6) enters the main body 41A from the inner surface 40Aa of the translucent member 4A in the space 40A, and a part thereof excites the phosphor 4a to fluoresce. Is generated. A part of the light incident on the main body 41A is directly or diffused into the light diffusing material 4b and emitted from the outer peripheral surface 41Aa of the main body 41A.

本実施の形態によっても、第１の実施の形態について説明したものと同様の作用及び効果が得られる。   Also according to the present embodiment, the same operations and effects as those described for the first embodiment can be obtained.

［第３の実施の形態］
次に、本発明の第３の実施の形態について図７を参照して説明する。図７は第３の実施の形態に係る発光バルブ１０Ｂを示し、（ａ）は全体断面図、（ｂ）は透光性部材４Ｂ及び反射部材７Ｂの拡大図である。この発光バルブ１０Ｂは、透光性部材４Ｂ及び反射部材７Ｂの構成が異なる他は、第１の実施の形態に係る発光バルブ１０と同様に構成されている。 [Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG. 7A and 7B show a light emitting bulb 10B according to the third embodiment, in which FIG. 7A is an overall cross-sectional view, and FIG. 7B is an enlarged view of the translucent member 4B and the reflecting member 7B. The light emitting bulb 10B is configured in the same manner as the light emitting bulb 10 according to the first embodiment, except that the translucent member 4B and the reflecting member 7B have different configurations.

透光性部材４Ｂは、本体部４１Ｂと鍔部４２Ｂとを一体に有している。本体部４１Ｂは円筒状であり、その中心部に空間４０Ｂが形成されている。本実施の形態では、本体部４１Ｂの肉厚が均一に成形されている。本体部４１Ｂは、レンズ３とは反対側の開口が反射部材７Ｂによって閉塞されている。   The translucent member 4B integrally includes a main body portion 41B and a flange portion 42B. The main body 41B is cylindrical, and a space 40B is formed at the center thereof. In the present embodiment, the thickness of the main body portion 41B is formed uniformly. In the main body 41B, the opening on the side opposite to the lens 3 is closed by the reflecting member 7B.

反射部材７Ｂは、円板状の基部７１と円錐状の反射部７２とを一体に有している。基部７１は本体部４１Ｂの開口を塞いで配置され、反射部７２は基部７１から空間４０Ｂに向かって突出している。反射部７２の外面は、鏡面加工された反射面７２ａとして形成されている。反射面７２ａは、レンズ３の光軸Ｌに対して傾斜している。   The reflecting member 7B has a disc-shaped base 71 and a conical reflecting portion 72 integrally. The base 71 is disposed so as to close the opening of the main body 41B, and the reflecting portion 72 protrudes from the base 71 toward the space 40B. The outer surface of the reflection portion 72 is formed as a reflection surface 72a that is mirror-finished. The reflection surface 72 a is inclined with respect to the optical axis L of the lens 3.

レンズ３によって集光され、空間４０Ｂに導入された光源２の光は、反射面７２ａによって反射され、空間４０Ｂにおける透光性部材４Ｂの内面４０Ｂａから透光性部材４Ｂ内に入射する。透光性部材４Ｂ内に入射した光の一部は蛍光体４ａを励起して蛍光を発生させ、他の一部は蛍光体４ａを励起させることなく、本体部４１Ｂの外周面４１Ｂａから放射される。   The light of the light source 2 collected by the lens 3 and introduced into the space 40B is reflected by the reflecting surface 72a and enters the translucent member 4B from the inner surface 40Ba of the translucent member 4B in the space 40B. Part of the light incident on the translucent member 4B excites the phosphor 4a to generate fluorescence, and the other part is emitted from the outer peripheral surface 41Ba of the main body 41B without exciting the phosphor 4a. The

本実施の形態によれば、第１の実施の形態について説明した（１）の作用及び効果と同様の作用及び効果に加え、空間４０Ｂに導入された光源２の光を反射面７２ａによって内面４０Ｂａに反射し、円筒状の本体部４１Ｂに入射させることができる。すなわち内面４０Ｂａへの光の入射角を小さくすることができ、透光性部材４Ｂの内部における光の進行方向を本体部４１Ｂの厚さ方向に近づけることができるので、外周面４１Ｂａから出射される光が透光性部材４Ｂ内を通過する距離のばらつきが抑制され、色むらがさらに抑制される。   According to the present embodiment, in addition to the operation and effect similar to the operation (1) described in the first embodiment, the light of the light source 2 introduced into the space 40B is reflected on the inner surface 40Ba by the reflection surface 72a. And can be incident on the cylindrical main body 41B. That is, the incident angle of light on the inner surface 40Ba can be reduced, and the traveling direction of light inside the translucent member 4B can be made closer to the thickness direction of the main body 41B, so that the light is emitted from the outer peripheral surface 41Ba. Variation in the distance that light passes through the translucent member 4B is suppressed, and color unevenness is further suppressed.

［第４の実施の形態］
次に、本発明の第４の実施の形態について図８を参照して説明する。図８は第４の実施の形態に係る発光バルブ１０Ｃを示し、（ａ）は全体断面図、（ｂ）は透光性部材４Ｃ及び反射部材７Ｃの拡大図である。この発光バルブ１０Ｃは、透光性部材４Ｃ及び反射部材７Ｃの構成が異なる他は、第１の実施の形態に係る発光バルブ１０と同様に構成されている。 [Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIG. 8A and 8B show a light emitting bulb 10C according to the fourth embodiment, in which FIG. 8A is an overall cross-sectional view, and FIG. 8B is an enlarged view of a translucent member 4C and a reflecting member 7C. The light emitting bulb 10C is configured in the same manner as the light emitting bulb 10 according to the first embodiment except that the translucent member 4C and the reflecting member 7C have different configurations.

透光性部材４Ｃは、本体部４１Ｃと鍔部４２Ｃとを一体に有している。本体部４１Ｃは円筒状であり、その中心部に空間４０Ｃが形成されている。本体部４１Ｃの肉厚は均一であり、本体部４１Ｃの一方の開口は反射部材７Ｃによって閉塞されている。   The translucent member 4C integrally includes a main body portion 41C and a flange portion 42C. The main body 41C has a cylindrical shape, and a space 40C is formed at the center thereof. The thickness of the main body 41C is uniform, and one opening of the main body 41C is closed by the reflecting member 7C.

反射部材７Ｃは、本体部４１Ｃの開口を塞ぐ円板状の基部７３と、基部７３からレンズ３に向かって順次外径が小さくなるように形成された第１乃至第３の円筒部７４〜７６とを一体に有している。   The reflecting member 7 </ b> C includes a disk-shaped base 73 that closes the opening of the main body 41 </ b> C, and first to third cylindrical portions 74 to 76 that are formed so that the outer diameter gradually decreases from the base 73 toward the lens 3. Are integrated.

基部７３と第１の円筒部７４との間の段差部には、第１の反射面７３ａが形成されている。第１の円筒部７４と第２の円筒部７５との間の段差部には、第２の反射面７４ａが形成されている。第２の円筒部７５と第３の円筒部７６との間の段差部には、第３の反射面７５ａが形成されている。また、第３の円筒部７６の先端部には、第４の反射面７６ａが形成されている。第１乃至第４の反射面７３ａ，７４ａ，７５ａ，７６ａは、透光性部材４Ｃの中心軸Ｃを中心とする同心円状であり、それぞれがレンズ３の光軸Ｌに対して傾斜したテーパ状の反射面として形成されている。すなわち、反射部材７Ｃには、複数の反射面（第１乃至第４の反射面７３ａ，７４ａ，７５ａ，７６ａ）がレンズ３の光軸Ｌに沿って離間した複数箇所に形成されている。   A first reflective surface 73 a is formed at the step portion between the base portion 73 and the first cylindrical portion 74. A second reflecting surface 74 a is formed at the step portion between the first cylindrical portion 74 and the second cylindrical portion 75. A third reflecting surface 75 a is formed at the step between the second cylindrical portion 75 and the third cylindrical portion 76. A fourth reflective surface 76 a is formed at the tip of the third cylindrical portion 76. The first to fourth reflecting surfaces 73a, 74a, 75a, and 76a are concentric with the central axis C of the translucent member 4C as the center, and each of them is a tapered shape that is inclined with respect to the optical axis L of the lens 3. It is formed as a reflective surface. That is, the reflective member 7C has a plurality of reflective surfaces (first to fourth reflective surfaces 73a, 74a, 75a, 76a) formed at a plurality of locations separated along the optical axis L of the lens 3.

第１乃至第４の反射面７３ａ，７４ａ，７５ａ，７６ａで反射した光源２の光は、空間４０Ｃにおける透光性部材４Ｃの内面４０Ｃａから透光性部材４Ｃ内に入射する。透光性部材４Ｃ内に入射した光の一部は蛍光体４ａを励起して蛍光を発生させ、他の一部は蛍光体４ａを励起させることなく、本体部４１Ｃの外周面４１Ｃａから放射される。   The light of the light source 2 reflected by the first to fourth reflecting surfaces 73a, 74a, 75a, and 76a enters the translucent member 4C from the inner surface 40Ca of the translucent member 4C in the space 40C. Part of the light incident on the translucent member 4C excites the phosphor 4a to generate fluorescence, and the other part is emitted from the outer peripheral surface 41Ca of the main body 41C without exciting the phosphor 4a. The

本実施の形態によれば、第３の実施の形態について説明した作用及び効果に加え、光源２の光を内面４０Ｃａにおける複数箇所から分散して透光性部材４Ｃ内に入射させることができる。これにより、透光性部材４Ｃの中心軸Ｃに沿った方向の広い範囲から色むらの少ない白色光を放射させることができる。また、一部の蛍光体４ａが集中的に励起されることなく広い範囲の蛍光体４ａが励起されるため、温度消光現象の発生をより抑制することができる。   According to the present embodiment, in addition to the operations and effects described for the third embodiment, the light of the light source 2 can be dispersed from a plurality of locations on the inner surface 40Ca and incident on the translucent member 4C. Thereby, white light with little color unevenness can be emitted from a wide range in the direction along the central axis C of the translucent member 4C. In addition, since a wide range of phosphors 4a is excited without intensively exciting some of the phosphors 4a, the occurrence of a temperature quenching phenomenon can be further suppressed.

以上、本発明の実施の形態を説明したが、上記に記載した実施の形態は特許請求の範囲に係る発明を限定するものではない。また、実施の形態の中で説明した特徴の組合せの全てが発明の課題を解決するための手段に必須であるとは限らない点に留意すべきである。   While the embodiments of the present invention have been described above, the embodiments described above do not limit the invention according to the claims. In addition, it should be noted that not all the combinations of features described in the embodiments are essential to the means for solving the problems of the invention.

また、本発明は、その趣旨を逸脱しない範囲で適宜変形して実施することが可能である。例えば、上記実施の形態では、第１乃至第３の光源２１〜２３は、青色の光を発するレーザダイオードであるとしたが、紫色の光又は紫外光を発するレーザダイオードであってもよい。この場合、紫色の光又は紫外光を発するレーザダイオードの出射光によって励起され、赤・青・緑の蛍光を発する３種の蛍光体を用いて白色の発光を得る。   Further, the present invention can be appropriately modified and implemented without departing from the spirit of the present invention. For example, in the above embodiment, the first to third light sources 21 to 23 are laser diodes that emit blue light, but may be laser diodes that emit purple light or ultraviolet light. In this case, white light emission is obtained by using three kinds of phosphors that are excited by light emitted from a laser diode that emits purple light or ultraviolet light and emits red, blue, and green fluorescence.

１…ヘッドライト、２…光源、３…レンズ、４，４Ａ，４Ｂ，４Ｃ…透光性部材、４ａ…蛍光体、４ｂ…光拡散材、４ｃ…基材、５…基台、６…支持部材、７，７Ａ，７Ｂ，７Ｃ…反射部材、７ａ，７Ａａ…反射面、８…ハロゲンバルブ、９…透光性部材、９ａ…入射面、１０，１０Ａ，１０Ｂ，１０Ｃ 発光バルブ、１１…凹面反射鏡、１１ａ…反射面、１２…アウタレンズ、１３…放熱板、２０…半導体レーザ素子、４０，４０Ａ，４０Ｂ，４０Ｃ…空間、４０ａ，４０Ａａ，４０Ｂａ，４０Ｃａ…内面、４１，４１Ａ，４１Ｂ，４１Ｃ…本体部、４１ａ，４１Ａａ，４１Ｂａ，４１Ｃａ…外周面、４２，４２Ａ，４２Ｂ，４２Ｃ…鍔部、５１…支持部、５１ａ…底面、５２…放熱部、５３…電極、５４…環状支持部材、５５…電源端子、７１…基部、７２…反射部、７２ａ…反射面、７３…基部、７３ａ…第１の反射面、７４ａ…第２の反射面、７５ａ…第３の反射面、７６ａ…第４の反射面、７４…第１の円筒部、７５…第２の円筒部、７６…第３の円筒部、８１…口金、８２…ガラス殻、８４…フィラメント、８５…電源端子、８６…ステム、９１…本体部、９１ａ…外周面、９２…鍔部、１００…発光部、１１０…奥部、１１１…挿通孔、４１０，４１０Ａ…底部、４１０ａ，４１０Ａａ…外面、４１１…第１筒部、４１２…第２筒部、４２１…段部、５２１…小径部、５２１ａ…上面、５２２…大径部、５２２ａ…外周面、５２３…段差部、５４０…窓部、Ｃ…中心軸、Ｌ…光軸、Ｌａ…青色光、Ｌｂ，Ｌｃ…出射光
DESCRIPTION OF SYMBOLS 1 ... Headlight, 2 ... Light source, 3 ... Lens, 4, 4A, 4B, 4C ... Translucent member, 4a ... Phosphor, 4b ... Light diffusing material, 4c ... Base material, 5 ... Base, 6 ... Support Members, 7, 7A, 7B, 7C ... reflective members, 7a, 7Aa ... reflective surfaces, 8 ... halogen bulbs, 9 ... translucent members, 9a ... incident surfaces, 10, 10A, 10B, 10C light emitting bulbs, 11 ... concave surfaces Reflector, 11a ... reflecting surface, 12 ... outer lens, 13 ... heat sink, 20 ... semiconductor laser element, 40, 40A, 40B, 40C ... space, 40a, 40Aa, 40Ba, 40Ca ... inner surface, 41, 41A, 41B, 41C ... Body part, 41a, 41Aa, 41Ba, 41Ca ... Outer peripheral surface, 42, 42A, 42B, 42C ... Gutter part, 51 ... Support part, 51a ... Bottom face, 52 ... Heat radiation part, 53 ... Electrode, 54 ... Ring support member, 55 ... Power terminal, 71 ... base part, 72 ... reflection part, 72a ... reflection surface, 73 ... base part, 73a ... first reflection surface, 74a ... second reflection surface, 75a ... third reflection surface, 76a ... fourth reflection surface, 74: first cylindrical portion, 75: second cylindrical portion, 76: third cylindrical portion, 81: base, 82: glass shell, 84: filament, 85: power terminal, 86: stem, 91: body portion 91a ... outer peripheral surface, 92 ... collar part, 100 ... light emitting part, 110 ... back part, 111 ... insertion hole, 410, 410A ... bottom part, 410a, 410Aa ... outer surface, 411 ... first cylinder part, 412 ... second cylinder 421 ... Stepped part 521 ... Small diameter part 521a ... Upper surface 522 ... Large diameter part 522a ... Outer peripheral surface 523 ... Stepped part 540 ... Window part, C ... Central axis, L ... Optical axis, La ... Blue Light, Lb, Lc ... outgoing light

Claims (7)

半導体レーザ素子と、
前記半導体レーザ素子が発する光の配光角を絞り、光軸上の焦点に向かって集光させるレンズと、
前記レンズを通過した前記半導体レーザ素子の光を励起光として蛍光を発する蛍光体を含む透光性部材と、
前記半導体レーザ素子を支持する支持部、及び前記支持部から前記半導体レーザ素子の熱を放熱する放熱部を有する基台と、
前記レンズの光軸に沿って配置され、前記透光性部材を前記半導体レーザ素子から離間させて前記基台に支持する支持部材とを備え、
前記透光性部材には、前記レンズの光軸に沿って前記半導体レーザ素子の光を導入する空間が形成され、
前記透光性部材は、前記レンズから離れるにつれて前記空間が縮小する領域を含む、
発光バルブ。 A semiconductor laser element;
A lens for condensing said semiconductor laser element Ri down the light distribution angle of light emitted is toward the focal point on the optical axis,
A translucent member including a phosphor that emits fluorescence using the light of the semiconductor laser element that has passed through the lens as excitation light;
A base having a support part for supporting the semiconductor laser element, and a heat dissipation part for dissipating heat of the semiconductor laser element from the support part;
A support member disposed along the optical axis of the lens, and supporting the light transmissive member on the base by separating the light transmissive member from the semiconductor laser element;
The translucent member is formed with a space for introducing the light of the semiconductor laser element along the optical axis of the lens,
The translucent member includes a region where the space is reduced as the distance from the lens increases.
Luminescent bulb. 半導体レーザ素子と、
前記半導体レーザ素子が発する光の配光角を絞り、光軸上の焦点に向かって集光させるレンズと、
前記レンズを通過した前記半導体レーザ素子の光を励起光として蛍光を発する蛍光体を含む透光性部材とを備え、
前記透光性部材には、前記レンズの光軸に沿って前記半導体レーザ素子の光を導入する空間が形成され、
前記透光性部材は、前記レンズから離れるにつれて前記空間が縮小する領域を含む、
発光バルブ。 A semiconductor laser element;
A lens for condensing said semiconductor laser element Ri down the light distribution angle of light emitted is toward the focal point on the optical axis,
A translucent member including a phosphor that emits fluorescence using the light of the semiconductor laser element that has passed through the lens as excitation light, and
The translucent member is formed with a space for introducing the light of the semiconductor laser element along the optical axis of the lens,
The translucent member includes a region where the space is reduced as the distance from the lens increases.
Luminescent bulb. 前記透光性部材は、前記レンズから離れるにつれてテーパ状に前記空間の内径が縮小する領域を含む、
請求項１又は２に記載の発光バルブ。 The translucent member includes a region in which the inner diameter of the space decreases in a tapered shape as the distance from the lens increases.
The light-emitting bulb according to claim 1 or 2. 前記透光性部材は、有底筒状に形成され、
前記透光性部材の底部における外面に反射面を接触させて配置された反射部材をさらに備えた、
請求項１乃至３の何れか１項に記載の発光バルブ。 The translucent member is formed in a bottomed cylindrical shape,
A reflection member disposed such that the reflection surface is in contact with the outer surface of the bottom of the translucent member;
The light emitting bulb according to any one of claims 1 to 3. 半導体レーザ素子と、
前記半導体レーザ素子が発する光の配光角を絞るレンズと、
前記レンズを通過した前記半導体レーザ素子の光を励起光として蛍光を発する蛍光体を含む透光性部材と、
前記半導体レーザ素子を支持する支持部、及び前記支持部から前記半導体レーザ素子の熱を放熱する放熱部を有する基台と、
前記レンズの光軸に沿って配置され、前記透光性部材を前記半導体レーザ素子から離間させて前記基台に支持する支持部材とを備え、
前記透光性部材には、前記レンズの光軸に沿って前記半導体レーザ素子の光を導入する空間が形成され、
前記透光性部材は、前記レンズから離れるにつれて前記空間が縮小する領域を含み、
前記透光性部材の前記空間に配置され、前記レンズの光軸に対して傾斜した反射面を有し、前記レンズを通過した前記半導体レーザ素子の光を前記空間の内面に反射する反射部材をさらに備えた、
発光バルブ。 A semiconductor laser element;
A lens for narrowing a light distribution angle of light emitted by the semiconductor laser element;
A translucent member including a phosphor that emits fluorescence using the light of the semiconductor laser element that has passed through the lens as excitation light;
A base having a support part for supporting the semiconductor laser element, and a heat dissipation part for dissipating heat of the semiconductor laser element from the support part;
A support member that is disposed along the optical axis of the lens, and that supports the base member while separating the translucent member from the semiconductor laser element;
The translucent member is formed with a space for introducing the light of the semiconductor laser element along the optical axis of the lens,
The translucent member includes a region where the space is reduced as the distance from the lens increases.
A reflecting member disposed in the space of the translucent member, having a reflecting surface inclined with respect to the optical axis of the lens, and reflecting the light of the semiconductor laser element that has passed through the lens to the inner surface of the space; In addition,
Luminescent bulb. 前記反射部材には、前記反射面が前記レンズの光軸に沿って離間した複数箇所に形成されている、
請求項５に記載の発光バルブ。 In the reflecting member, the reflecting surface is formed at a plurality of locations separated along the optical axis of the lens.
The light emitting bulb according to claim 5. 請求項１乃至６の何れか１項に記載の発光バルブと、
前記発光バルブに取り付けられる凹面反射鏡とを備えた
車両用灯具。 The light emitting bulb according to any one of claims 1 to 6,
Vehicle lamp having a concave reflector mounted to the light emitting valves.
JP2012216385A 2012-09-28 2012-09-28 Luminescent bulb and vehicle lamp Expired - Fee Related JP5994537B2 (en)

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