JP2009266437A - Lighting fixture for vehicle - Google Patents

Lighting fixture for vehicle Download PDF

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Publication number
JP2009266437A
JP2009266437A JP2008111818A JP2008111818A JP2009266437A JP 2009266437 A JP2009266437 A JP 2009266437A JP 2008111818 A JP2008111818 A JP 2008111818A JP 2008111818 A JP2008111818 A JP 2008111818A JP 2009266437 A JP2009266437 A JP 2009266437A
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Prior art keywords
phosphor
light
emitting element
light emitting
selection filter
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JP2008111818A
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JP5271590B2 (en
Inventor
Yoshitaka Sasaki
祥敬 佐々木
Hisayoshi Daicho
久芳 大長
Yasuaki Tsutsumi
康章 堤
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Koito Manufacturing Co Ltd
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Koito Manufacturing Co Ltd
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Priority to JP2008111818A priority Critical patent/JP5271590B2/en
Priority to PCT/JP2009/057930 priority patent/WO2009131126A1/en
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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
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
    • F21S41/148—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device the main emission direction of the LED being perpendicular to the optical axis
    • 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
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/151—Light emitting diodes [LED] arranged in one or more lines
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/20—Dichroic filters, i.e. devices operating on the principle of wave interference to pass specific ranges of wavelengths while cancelling others
    • 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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/323—Optical layout thereof the reflector having two perpendicular cross sections having regular geometrical curves of a distinct nature
    • 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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/36—Combinations of two or more separate reflectors
    • F21S41/365—Combinations of two or more separate reflectors successively reflecting the light
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting fixture for a vehicle, which can improve utilization efficiency of light. <P>SOLUTION: The lighting fixture 10 for the vehicle includes a semiconductor light-emitting element 32, a phosphor 40 which emits light having a different wavelength from irradiation light by being irradiated from the outside, a wavelength selection filter 42 which is installed between the semiconductor light-emitting element 32 and the phosphor 40 and transmits light from the semiconductor light-emitting element 32 and reflects the light emitted from the phosphor 40, and an irradiation optical system 16 which radiates light emitted directly from the phosphor 40 and the light reflected by the wavelength selection filter 42 in a prescribed radiation direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、半導体発光素子を光源とする車両用灯具に関する。   The present invention relates to a vehicular lamp using a semiconductor light emitting element as a light source.

従来、ＬＥＤ（Ｌｉｇｈｔ Ｅｍｉｔｔｉｎｇ Ｄｉｏｄｅ）等の半導体発光素子を用いた車両用灯具が知られている。近年では、半導体発光素子を用いた車両用灯具を車両用前照灯（ヘッドライド）として用いることが検討されている（たとえば特許文献１参照）。車両用前照灯においては、自動車用前照灯規格（ＪＩＳ Ｄ５５００）で規定される白色光領域の白色光を照射する必要がある。   Conventionally, a vehicular lamp using a semiconductor light emitting element such as an LED (Light Emitting Diode) is known. In recent years, it has been studied to use a vehicular lamp using a semiconductor light emitting element as a vehicular headlamp (for example, see Patent Document 1). In a vehicle headlamp, it is necessary to irradiate white light in a white light region defined by the automotive headlamp standard (JIS D5500).

半導体発光素子を用いて白色光を発生させる方法としては、蛍光体を用いる方法が多く採用されている。たとえば、青色ＬＥＤから出射された青色光を励起光としてＹＡＧ蛍光物質により形成された蛍光体に照射すると、蛍光として得られた黄色光と、蛍光体を透過した青色光とが合わさり、白色光を得ることができる。
特開２００４−２４１１４２号公報 As a method for generating white light using a semiconductor light emitting element, a method using a phosphor is often employed. For example, when blue light emitted from a blue LED is irradiated as an excitation light to a phosphor formed of a YAG fluorescent material, the yellow light obtained as fluorescence and the blue light transmitted through the phosphor are combined to produce white light. Obtainable.
JP 2004-241142 A

ところで、半導体発光素子から蛍光体に励起光を照射した場合、蛍光は蛍光体から等方的に放射される。従って、蛍光の一部は所定の照射方向に放射されず、車両用灯具から有効に取り出すことができていなかった。   By the way, when the phosphor is irradiated with the excitation light from the semiconductor light emitting element, the fluorescence is isotropically radiated from the phosphor. Therefore, a part of the fluorescent light is not emitted in the predetermined irradiation direction and cannot be effectively extracted from the vehicle lamp.

本発明はこうした状況に鑑みてなされたものであり、その目的は、光の利用効率を向上できる車両用灯具を提供することにある。   This invention is made | formed in view of such a condition, The objective is to provide the vehicle lamp which can improve the utilization efficiency of light.

上記課題を解決するために、本発明のある態様の車両用灯具は、半導体発光素子と、外部から光を照射されることにより、照射光とは異なる波長を有する光を発する蛍光体と、半導体発光素子と蛍光体との間に設けられ、半導体発光素子からの光を透過して、蛍光体から発せられた光を反射する波長選択フィルタと、蛍光体から直接発せられた光および波長選択フィルタにより反射された光を、所定の照射方向に照射する照射光学系とを備える。   In order to solve the above problems, a vehicular lamp according to an aspect of the present invention includes a semiconductor light emitting element, a phosphor that emits light having a wavelength different from the irradiated light when irradiated with light from the outside, and a semiconductor. A wavelength selection filter that is provided between the light emitting element and the phosphor, transmits light from the semiconductor light emitting element, and reflects light emitted from the phosphor, and light and wavelength selection filter directly emitted from the phosphor And an irradiation optical system that irradiates the light reflected by the light in a predetermined irradiation direction.

ここで、半導体発光素子と蛍光体との「間」とは、半導体発光素子から蛍光体に照射された光の光路における「間」を意味する。また、蛍光体から直接発せられた光は、半導体発光素子から出射された後、そのまま蛍光体を透過した光と、蛍光体が励起されて発生した光とを含む。   Here, “between” the semiconductor light emitting element and the phosphor means “between” in the optical path of the light emitted from the semiconductor light emitting element to the phosphor. The light directly emitted from the phosphor includes light that is emitted from the semiconductor light emitting element and then passes through the phosphor as it is, and light that is generated when the phosphor is excited.

この態様によると、半導体発光素子から出射された光は、波長選択フィルタを透過して蛍光体に照射され、照射光とは異なる波長を有する光が等方的に放射される。蛍光体から放射された光のうち、波長選択フィルタの方向に放射された光は、波長選択フィルタにおいて反射され、再び蛍光体へと向かい、蛍光体から直接発せられた光とともに、照射光学系により所定の照射方向に照射される。従って、蛍光体から波長選択フィルタの方向に放射された光を取り出すことができるようになるので、光の利用効率を向上することができる。   According to this aspect, the light emitted from the semiconductor light emitting element is transmitted to the phosphor through the wavelength selection filter, and light having a wavelength different from the irradiation light is emitted isotropically. Of the light emitted from the phosphor, the light emitted in the direction of the wavelength selection filter is reflected by the wavelength selection filter, travels again toward the phosphor, and is emitted directly from the phosphor by the irradiation optical system. Irradiation is performed in a predetermined irradiation direction. Accordingly, light emitted from the phosphor in the direction of the wavelength selection filter can be taken out, so that the light use efficiency can be improved.

半導体発光素子は、波長選択フィルタから離間して設けられており、半導体発光素子からの光を波長選択フィルタに集光する集光光学部材をさらに備えてもよい。この場合、半導体発光素子の発生した熱が蛍光体に伝わり難くなるので、蛍光体の熱による劣化を抑制できる。また、蛍光体の温度上昇により起こる発光輝度の低下を抑制できるので、車両用灯具の輝度を高めることができる。   The semiconductor light emitting element may be further provided with a condensing optical member that is provided apart from the wavelength selection filter and collects light from the semiconductor light emitting element on the wavelength selection filter. In this case, since the heat generated by the semiconductor light emitting element is difficult to be transmitted to the phosphor, deterioration of the phosphor due to heat can be suppressed. Moreover, since the fall of the light emission brightness which arises with the temperature rise of fluorescent substance can be suppressed, the brightness | luminance of a vehicle lamp can be raised.

複数の半導体発光素子と、複数の半導体発光素子に対応して設けられた複数の集光光学部材とを備え、複数の集光光学部材のそれぞれは、対応する半導体発光素子が発生する光を、波長選択フィルタに集光してもよい。この場合、複数の半導体発光素子が発生する光を波長選択フィルタに集光することにより、車両用灯具の輝度を高めることができる。   A plurality of semiconductor light emitting elements, and a plurality of condensing optical members provided corresponding to the plurality of semiconductor light emitting elements, and each of the plurality of condensing optical members emits light generated by the corresponding semiconductor light emitting element, The light may be condensed on the wavelength selection filter. In this case, the brightness | luminance of a vehicle lamp can be raised by condensing the light which a several semiconductor light-emitting device generate | occur | produces on a wavelength selection filter.

集光光学部材は、楕円鏡であって、楕円鏡の第１焦点に半導体発光素子を設け、楕円鏡の第２焦点に波長選択フィルタを設けてもよい。この場合、好適に半導体発光素子と蛍光体とを離間させた車両用灯具を構成することができる。   The condensing optical member may be an elliptical mirror, in which a semiconductor light emitting element is provided at the first focal point of the elliptical mirror, and a wavelength selection filter is provided at the second focal point of the elliptical mirror. In this case, it is possible to configure a vehicular lamp in which the semiconductor light emitting element and the phosphor are preferably separated.

本発明によれば、光の利用効率を向上できる車両用灯具を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the vehicle lamp which can improve the utilization efficiency of light can be provided.

以下、図面を参照して本発明の実施の形態について詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図１は、本発明の実施の形態に係る車両用灯具１０を示す側断面図である。図１に示すように、車両用灯具１０は、支持部材２６と、ＬＥＤモジュール１２と、楕円鏡１４と、蛍光体モジュール３０と、照射光学系１６とを備える。   FIG. 1 is a side sectional view showing a vehicular lamp 10 according to an embodiment of the present invention. As shown in FIG. 1, the vehicular lamp 10 includes a support member 26, an LED module 12, an elliptical mirror 14, a phosphor module 30, and an irradiation optical system 16.

車両用灯具１０は、車両用前照灯の一部として組み込まれた状態で用いられる所謂プロジェクタ型の灯具ユニットであって、車両用前照灯に組み込まれた状態では、その光軸Ａｘが車両前後方向に対して０．５〜０．６°程度下向きの方向に延びた状態で配置されるようになっている。   The vehicular lamp 10 is a so-called projector-type lamp unit used in a state of being incorporated as a part of a vehicular headlamp. In the state of being incorporated in a vehicular headlamp, the optical axis Ax is the vehicle. It arrange | positions in the state extended in the downward direction about 0.5-0.6 degree with respect to the front-back direction.

支持部材２６は、ＬＥＤモジュール１２、楕円鏡１４、蛍光体モジュール３０、照射光学系１６等を支持する板状の部材である。支持部材２６の後方側の下面には、ＬＥＤモジュール１２が固定されている。本実施の形態において、ＬＥＤモジュール１２は、鉛直下方向に最も強度の高い光を照射するように配置されている。   The support member 26 is a plate-like member that supports the LED module 12, the elliptical mirror 14, the phosphor module 30, the irradiation optical system 16, and the like. The LED module 12 is fixed to the lower surface of the support member 26 on the rear side. In this Embodiment, the LED module 12 is arrange | positioned so that light with the highest intensity | strength may be irradiated to the perpendicular downward direction.

ＬＥＤモジュール１２は、半導体発光素子３２と、基板３４と、封止部材３６とを有する。本実施の形態において、半導体発光素子３２は、蛍光体モジュール３０から離間して設けられている。半導体発光素子３２は、配線パターンが形成された基板３４上に固定されている。   The LED module 12 includes a semiconductor light emitting element 32, a substrate 34, and a sealing member 36. In the present embodiment, the semiconductor light emitting element 32 is provided apart from the phosphor module 30. The semiconductor light emitting element 32 is fixed on a substrate 34 on which a wiring pattern is formed.

本実施の形態において、半導体発光素子３２は、波長４００〜４８５ｎｍ程度の青色光を照射する青色ＬＥＤである。封止部材３６は、ＬＥＤモジュール１２における樹脂モールドであり、たとえば透明樹脂等により形成され、半導体発光素子３２を封止する。また、封止部材３６は、半導体発光素子３２が発生する青色光を楕円鏡１４に向かって透過させる。   In the present embodiment, the semiconductor light emitting element 32 is a blue LED that emits blue light having a wavelength of about 400 to 485 nm. The sealing member 36 is a resin mold in the LED module 12 and is formed of, for example, a transparent resin and seals the semiconductor light emitting element 32. Further, the sealing member 36 transmits the blue light generated by the semiconductor light emitting element 32 toward the elliptical mirror 14.

楕円鏡１４は、ＬＥＤモジュール１２の下方を覆うように支持部材２６に取り付けられており、ＬＥＤモジュール１２から出射された青色光を上方に反射させる回転楕円面で構成された反射面１４ａを有している。反射面１４ａは、その第１焦点に半導体発光素子３２の発光中心が位置し、第２焦点に蛍光体モジュール３０の中心が位置するように設けられる。このように形成された楕円鏡１４は、第１焦点の位置に配置された半導体発光素子３２から出射された青色光を、第２焦点の位置に配置された蛍光体モジュール３０に集光する。   The elliptical mirror 14 is attached to the support member 26 so as to cover the lower side of the LED module 12, and has a reflection surface 14 a formed of a spheroidal surface that reflects blue light emitted from the LED module 12 upward. ing. The reflection surface 14a is provided such that the light emission center of the semiconductor light emitting element 32 is located at the first focus and the center of the phosphor module 30 is located at the second focus. The elliptical mirror 14 thus formed condenses the blue light emitted from the semiconductor light emitting element 32 disposed at the first focal position on the phosphor module 30 disposed at the second focal position.

蛍光体モジュール３０は、支持部材２６に形成された開口部２６ａに埋設されている。蛍光体モジュール３０は、蛍光体４０と、蛍光体４０の下面に形成された波長選択フィルタ４２と、蛍光体４０および波長選択フィルタ４２を支持して支持部材２６に取り付けるための支持部材３８とを含む。蛍光体モジュール３０は、ＬＥＤモジュール１２により出射された青色光の照射により、白色光を生成して上方へ向けて出射させる。   The phosphor module 30 is embedded in an opening 26 a formed in the support member 26. The phosphor module 30 includes a phosphor 40, a wavelength selection filter 42 formed on the lower surface of the phosphor 40, and a support member 38 for supporting the phosphor 40 and the wavelength selection filter 42 and attaching to the support member 26. Including. The phosphor module 30 generates white light by emitting blue light emitted from the LED module 12 and emits the light upward.

蛍光体４０は、外部から光を照射されることにより、照射光とは異なる波長を有する光を発する。本実施の形態では、蛍光体４０は、イットリウム、アルミニウム、ガーネット系（ＹＡＧ）からなるＹＡＧ蛍光物質により形成される蛍光体である。この蛍光体４０にＬＥＤモジュール１２から発せられた青色光が照射されると、蛍光体４０は、その青色光の補色である黄色光を発生する。蛍光体４０は、略正方形状の支持部材３８の中央に形成された孔部に、蛍光材料とバインダー材を混合したものを入れて、印刷法により平面状に形成される。支持部材３８は、熱伝導率の高いたとえばアルミニウム等の金属により形成されることが好ましい。この場合、支持部材３８は蛍光体４０に発生した熱を放熱する放熱部材として機能し、蛍光体４０の熱による劣化を抑制できる。また、蛍光体４０の温度上昇による発光輝度の低下を回避できる。   The phosphor 40 emits light having a wavelength different from the irradiated light when irradiated with light from the outside. In the present embodiment, the phosphor 40 is a phosphor formed of a YAG phosphor material made of yttrium, aluminum, and garnet (YAG). When the phosphor 40 is irradiated with blue light emitted from the LED module 12, the phosphor 40 generates yellow light which is a complementary color of the blue light. The phosphor 40 is formed in a planar shape by a printing method by putting a mixture of a fluorescent material and a binder material into a hole formed in the center of a substantially square support member 38. The support member 38 is preferably formed of a metal having a high thermal conductivity such as aluminum. In this case, the support member 38 functions as a heat radiating member that radiates heat generated in the phosphor 40, and can suppress deterioration of the phosphor 40 due to heat. Further, it is possible to avoid a decrease in light emission luminance due to a temperature rise of the phosphor 40.

波長選択フィルタ４２は、ＬＥＤモジュール１２の半導体発光素子３２と蛍光体４０との間に設けられる。ここでいう半導体発光素子３２と蛍光体４０の「間」とは、半導体発光素子３２から蛍光体４０へと向かう光の光路における「間」である。本実施の形態では、波長選択フィルタ４２は、蛍光体４０の下面に、たとえば蒸着により形成された誘電体多層膜である。   The wavelength selection filter 42 is provided between the semiconductor light emitting element 32 of the LED module 12 and the phosphor 40. The “between” of the semiconductor light emitting element 32 and the phosphor 40 here is “between” in the optical path of light traveling from the semiconductor light emitting element 32 to the phosphor 40. In the present embodiment, the wavelength selection filter 42 is a dielectric multilayer film formed on the lower surface of the phosphor 40 by, for example, vapor deposition.

本実施の形態において、波長選択フィルタ４２は、ＬＥＤモジュール１２からの青色光を透過して、蛍光体４０から発せられた黄色光を反射するよう形成される。誘電体多層膜は、屈折率の異なる誘電体物質を交互に多層に積層した薄膜であり、多重反射と多重干渉の効果により、ある所定の波長帯域の光を略１００％透過し、他の所定の波長を略１００％反射するように設計することができる。本実施の形態では、波長選択フィルタ４２は、波長４００〜４８５ｎｍの青色光を略１００％透過し、波長４８６〜８００ｎｍの光を略１００％反射するよう形成される。また、ＬＥＤモジュール１２から発せられた光が近紫外光の場合、波長選択フィルタ４２は、近紫外光を透過して、可視光を反射する特性を持つ。このとき、波長選択フィルタ４２は、波長３７０〜４３０ｎｍの近紫外光を略１００％透過し、波長４３１〜７８０ｎｍの光を略１００％反射するよう形成される。   In the present embodiment, the wavelength selection filter 42 is formed so as to transmit blue light from the LED module 12 and reflect yellow light emitted from the phosphor 40. A dielectric multilayer film is a thin film in which dielectric materials having different refractive indexes are alternately laminated in multiple layers. Due to the effects of multiple reflection and multiple interference, the dielectric multilayer film transmits substantially 100% of light in a predetermined wavelength band and other predetermined wavelengths. Can be designed to reflect almost 100% of the wavelength. In the present embodiment, the wavelength selection filter 42 is formed to transmit approximately 100% of blue light having a wavelength of 400 to 485 nm and reflect approximately 100% of light having a wavelength of 486 to 800 nm. Further, when the light emitted from the LED module 12 is near-ultraviolet light, the wavelength selection filter 42 has a characteristic of transmitting near-ultraviolet light and reflecting visible light. At this time, the wavelength selection filter 42 is formed so as to transmit approximately 100% of near-ultraviolet light having a wavelength of 370 to 430 nm and reflect approximately 100% of light having a wavelength of 431 to 780 nm.

照射光学系１６は、蛍光体モジュール３０から出射された白色光を配光制御して灯具前方へ向けて照射する。照射光学系１６は、蛍光体モジュール３０の後方、側方および上方を囲むように設けられ、蛍光体モジュール３０から出射された白色光を灯具前方へ向けて光軸Ａｘ寄りに反射させるよう構成されたリフレクタ２４と、このリフレクタ２４からの反射光の一部を上方側へ反射させるよう、支持部材２６の上面に形成された反射面２６ｂと、リフレクタ２４および反射面２６ｂに対して車両前方に設けられ、リフレクタ２４または反射面２６ｂが反射する白色光を透過して前方の照射方向に照射する投影レンズ２２とを含む。   The irradiation optical system 16 controls the light distribution of the white light emitted from the phosphor module 30 and irradiates it forward of the lamp. The irradiation optical system 16 is provided so as to surround the rear side, the side, and the upper side of the phosphor module 30, and is configured to reflect white light emitted from the phosphor module 30 toward the front of the lamp toward the optical axis Ax. The reflector 24, a reflecting surface 26b formed on the upper surface of the support member 26 so as to reflect a part of the reflected light from the reflector 24 upward, and the reflector 24 and the reflecting surface 26b are provided in front of the vehicle. And a projection lens 22 that transmits the white light reflected by the reflector 24 or the reflection surface 26b and irradiates it in the front irradiation direction.

投影レンズ２２は、前方側表面が凸面で後方側表面が平面の平凸レンズからなり、その後側焦点Ｆを含む焦点面上の像を反転像として灯具前方の仮想鉛直スクリーン上に投影する。この投影レンズ２２は、レンズホルダ１８に支持されている。そして、このレンズホルダ１８は、支持部材２６の前端に設けられたブラケット部２６ｃに支持されている。   The projection lens 22 is a plano-convex lens having a convex front surface and a flat rear surface, and projects an image on the focal plane including the rear focal point F onto the virtual vertical screen in front of the lamp as an inverted image. The projection lens 22 is supported by the lens holder 18. The lens holder 18 is supported by a bracket portion 26 c provided at the front end of the support member 26.

リフレクタ２４の反射面２４ａは、光軸Ａｘと同軸の長軸を有するとともに、蛍光体モジュール３０の中心点を第１焦点とする略楕円面状の曲面で構成されている。反射面２４ａは、その光軸Ａｘに沿った鉛直断面形状が後側焦点Ｆを第２焦点とする楕円形状に設定されており、その離心率が鉛直断面から水平断面へ向けて徐々に大きくなるように設定されている。   The reflecting surface 24a of the reflector 24 has a long axis that is coaxial with the optical axis Ax, and is configured by a substantially elliptical curved surface having the central point of the phosphor module 30 as a first focal point. The reflecting surface 24a is set to have an elliptical shape in which the vertical cross section along the optical axis Ax has the rear focal point F as the second focal point, and the eccentricity gradually increases from the vertical cross section toward the horizontal cross section. Is set to

支持部材２６の反射面２６ｂは、支持部材２６の上面にアルミニウム蒸着等による鏡面処理を施すことにより形成されている。反射面２６ｂは、リフレクタ２４の反射面２４ａから投影レンズ２２へ向かう反射光の一部を上向きに反射させて投影レンズ２２に入射させ、投影レンズ２２から出射させるようになっている。   The reflection surface 26b of the support member 26 is formed by performing a mirror surface treatment such as aluminum deposition on the upper surface of the support member 26. The reflection surface 26 b reflects a part of the reflected light directed from the reflection surface 24 a of the reflector 24 toward the projection lens 22 so as to be incident on the projection lens 22 and emitted from the projection lens 22.

図２は、本発明の実施の形態に係る車両用灯具の作用を説明するための図である。図２では、説明を簡易にするために、ＬＥＤモジュール１２から出射された青色光５０が、楕円鏡１４を介さず蛍光体モジュール３０に直接入射するように表している。また、蛍光体モジュール３０の蛍光体４０と波長選択フィルタ４２を離間するように表している。   FIG. 2 is a diagram for explaining the operation of the vehicular lamp according to the embodiment of the present invention. In FIG. 2, for simplicity of explanation, the blue light 50 emitted from the LED module 12 is shown to be directly incident on the phosphor module 30 without passing through the elliptical mirror 14. In addition, the phosphor 40 of the phosphor module 30 and the wavelength selection filter 42 are shown to be separated from each other.

ＬＥＤモジュール１２の半導体発光素子３２が発生した青色光５０は、波長選択フィルタ４２の下面に入射する。波長選択フィルタ４２に入射した青色光５０は、略全て波長選択フィルタ４２を透過し、蛍光体４０の下面に入射する。   The blue light 50 generated by the semiconductor light emitting element 32 of the LED module 12 is incident on the lower surface of the wavelength selection filter 42. The blue light 50 that has entered the wavelength selection filter 42 passes through the wavelength selection filter 42 and enters the lower surface of the phosphor 40.

青色光５０が蛍光体４０に入射すると、蛍光体４０におけるＹＡＧ蛍光物質は青色光５０の一部により励起され、黄色光を発生する。この黄色光５２は、蛍光体４０から等方的に放射されるため、一部は蛍光体４０の上方に直接放射される（黄色光５２と表す）が、一部は蛍光体４０の下方に放射される（黄色光５４と表す）。蛍光体４０の下方に向けて放射された黄色光５４は、波長選択フィルタ４２の上面に入射するが、波長選択フィルタ４２は、黄色光を反射するように形成されているため、略全ての黄色光５４が波長選択フィルタ４２により反射されて、蛍光体４０の下面に入射し、蛍光体４０の上面から出射される（黄色光５４’と表す）。また、蛍光体４０の上面からは、蛍光体４０を励起せずに蛍光体４０を透過する青色光５０’も出射される。   When the blue light 50 is incident on the phosphor 40, the YAG fluorescent material in the phosphor 40 is excited by a part of the blue light 50 to generate yellow light. Since this yellow light 52 is emitted isotropically from the phosphor 40, a part is directly emitted above the phosphor 40 (referred to as yellow light 52), but a part is below the phosphor 40. Emitted (represented as yellow light 54). The yellow light 54 emitted toward the lower side of the phosphor 40 is incident on the upper surface of the wavelength selection filter 42. However, since the wavelength selection filter 42 is formed so as to reflect yellow light, almost all yellow light is emitted. The light 54 is reflected by the wavelength selection filter 42, enters the lower surface of the phosphor 40, and is emitted from the upper surface of the phosphor 40 (represented as yellow light 54 ′). Further, blue light 50 ′ that passes through the phosphor 40 without exciting the phosphor 40 is also emitted from the upper surface of the phosphor 40.

従って、蛍光体４０の上面からは、蛍光体４０を透過した青色光５０’と、蛍光体４０から直接放射された黄色光５２と、波長選択フィルタ４２により反射された黄色光５４’とが出射され、これらの光が合わさることにより、白色光５６が生成される。生成された白色光５６は、上述した照射光学系１６により配光制御され、灯具前方に向けて照射される。   Accordingly, from the upper surface of the phosphor 40, blue light 50 ′ transmitted through the phosphor 40, yellow light 52 directly emitted from the phosphor 40, and yellow light 54 ′ reflected by the wavelength selection filter 42 are emitted. When these lights are combined, white light 56 is generated. The generated white light 56 is subjected to light distribution control by the irradiation optical system 16 described above, and is irradiated toward the front of the lamp.

このように、本実施の形態に係る車両用灯具１０によれば、蛍光体４０から等方的に放射された黄色光のうち、波長選択フィルタ４２の方向に放射された黄色光は、波長選択フィルタ４２により反射され、蛍光体４０の上方へと出射される。本実施の形態のように、波長選択フィルタ４２を設けない場合、蛍光体４０から下方向に放射された光は、照射光学系１６に入射されず、車両用灯具から取り出すことができない。本実施の形態のようにＬＥＤモジュール１２と蛍光体４０の間に波長選択フィルタ４２を設けることにより、蛍光体４０から波長選択フィルタ４２の方向に放射された黄色光を照射光学系１６に入射させることができるので、光の利用効率が向上され、車両用灯具１０の輝度を高めることができる。   As described above, according to the vehicular lamp 10 according to the present embodiment, among the yellow light emitted isotropically from the phosphor 40, the yellow light emitted in the direction of the wavelength selection filter 42 is wavelength selected. The light is reflected by the filter 42 and emitted upward from the phosphor 40. When the wavelength selection filter 42 is not provided as in the present embodiment, the light emitted downward from the phosphor 40 is not incident on the irradiation optical system 16 and cannot be extracted from the vehicular lamp. By providing the wavelength selection filter 42 between the LED module 12 and the phosphor 40 as in the present embodiment, yellow light emitted from the phosphor 40 in the direction of the wavelength selection filter 42 is incident on the irradiation optical system 16. Therefore, the light use efficiency is improved, and the brightness of the vehicular lamp 10 can be increased.

また、本実施の形態に係る車両用灯具１０では、ＬＥＤモジュール１２の半導体発光素子３２から出射された青色光が楕円鏡１４により集光されて蛍光体モジュール３０の蛍光体４０に入射する構成となっている。従って、蛍光体４０と半導体発光素子３２とが離間して設けられているので、半導体発光素子３２の発生した熱が蛍光体４０に伝わり難くなり、蛍光体４０の熱による劣化を抑制できる。また、蛍光体４０の温度上昇により起こる発光輝度の低下を抑制できるので、車両用灯具１０の輝度を高めることができる。   Further, in the vehicular lamp 10 according to the present embodiment, the blue light emitted from the semiconductor light emitting element 32 of the LED module 12 is collected by the elliptical mirror 14 and is incident on the phosphor 40 of the phosphor module 30. It has become. Accordingly, since the phosphor 40 and the semiconductor light emitting element 32 are provided apart from each other, the heat generated by the semiconductor light emitting element 32 is difficult to be transmitted to the phosphor 40, and deterioration of the phosphor 40 due to heat can be suppressed. Moreover, since the fall of the light emission brightness which arises with the temperature rise of the fluorescent substance 40 can be suppressed, the brightness | luminance of the vehicle lamp 10 can be raised.

図３は、本発明の別の実施の形態に係る車両用灯具３００の側断面図である。図３に示す車両用灯具３００において、図１に示す車両用灯具１０と同一または対応する構成要素については、同一の符号を用いるとともに、適宜説明を省略する。   FIG. 3 is a side sectional view of a vehicular lamp 300 according to another embodiment of the present invention. In the vehicular lamp 300 shown in FIG. 3, the same or corresponding components as those in the vehicular lamp 10 shown in FIG.

本実施の形態に係る車両用灯具３００は、蛍光体モジュール３０を中心にして分配配置された、第１ＬＥＤモジュール３１２ａ、第２ＬＥＤモジュール３１２ｂ、第３ＬＥＤモジュール３１２ｃ、第４ＬＥＤモジュール（図示せず）の４つのＬＥＤモジュールを備えている。以下、第１〜第４ＬＥＤモジュールを総称する場合は、単に「ＬＥＤモジュール３１２」と呼ぶ。   The vehicular lamp 300 according to the present embodiment includes four of a first LED module 312a, a second LED module 312b, a third LED module 312c, and a fourth LED module (not shown) that are distributed around the phosphor module 30. There are two LED modules. Hereinafter, the first to fourth LED modules are collectively referred to as “LED module 312”.

第１ＬＥＤモジュール３１２ａおよび第２ＬＥＤモジュール３１２ｂは、蛍光体モジュール３０を中央に挟んで車両前後方向に並んで設けられている。第３ＬＥＤモジュール３１２ｃおよび第４ＬＥＤモジュールは、蛍光体モジュール３０を中央に挟んで車両左右方向に並んで設けられている。各ＬＥＤモジュール３１２は、図１に示す車両用灯具１０と同様に、青色光を出射する半導体発光素子３２を有する。各ＬＥＤモジュール３１２は、鉛直下方向に最も強度の高い光を照射するように配置されている。   The first LED module 312a and the second LED module 312b are provided side by side in the vehicle front-rear direction with the phosphor module 30 in between. The third LED module 312c and the fourth LED module are provided side by side in the vehicle left-right direction with the phosphor module 30 in between. Each LED module 312 has a semiconductor light emitting element 32 that emits blue light, similarly to the vehicular lamp 10 shown in FIG. Each LED module 312 is arranged so as to irradiate light with the highest intensity in the vertically downward direction.

各ＬＥＤモジュール３１２から出射された青色光は、楕円鏡３１４により上方に反射され、蛍光体モジュール３０の波長選択フィルタ４２に入射される。楕円鏡３１４は、各ＬＥＤモジュール３１２の半導体発光素子３２の発光中心を第１焦点とするとともに、蛍光体モジュール３０の中心を第２焦点とする回転楕円面で構成された４つの反射面を有している。すなわち、楕円鏡１４は、第１ＬＥＤモジュール３１２ａから出射された青色光を蛍光体モジュール３０に集光する第１反射面３１４ａと、第２ＬＥＤモジュール３１２ｂから出射された青色光を蛍光体モジュール３０に集光する第２反射面３１４ｂと、第３ＬＥＤモジュール３１２ｃから出射された青色光を蛍光体モジュール３０に集光する第３反射面３１４ｃと、第４ＬＥＤモジュールから出射された青色光を蛍光体モジュール３０に集光する第４反射面（図示せず）を有している。   Blue light emitted from each LED module 312 is reflected upward by the elliptical mirror 314 and is incident on the wavelength selection filter 42 of the phosphor module 30. The elliptical mirror 314 has four reflecting surfaces formed of a spheroid with the light emission center of the semiconductor light emitting element 32 of each LED module 312 as the first focus and the center of the phosphor module 30 as the second focus. is doing. That is, the elliptical mirror 14 collects the blue light emitted from the first LED module 312a on the phosphor module 30 and the blue light emitted from the second LED module 312b on the phosphor module 30. The second reflecting surface 314b that emits light, the third reflecting surface 314c that condenses the blue light emitted from the third LED module 312c on the phosphor module 30, and the blue light emitted from the fourth LED module to the phosphor module 30. It has the 4th reflective surface (not shown) which condenses.

各ＬＥＤモジュール３１２から出射され、それぞれ対応する反射面により反射されて蛍光体モジュール３０に集光された青色光は、蛍光体４０を励起させ、白色光が生成される。このとき、蛍光体４０の下面に波長選択フィルタ４２を設けたことにより、蛍光体４０から波長選択フィルタ４２の方向に放射された黄色光を蛍光体４０の上方に取り出すことができることは、図２において説明した車両用灯具１０の作用と同様である。   The blue light emitted from each LED module 312 and reflected by the corresponding reflecting surface and condensed on the phosphor module 30 excites the phosphor 40 to generate white light. At this time, by providing the wavelength selection filter 42 on the lower surface of the phosphor 40, yellow light emitted from the phosphor 40 in the direction of the wavelength selection filter 42 can be taken out above the phosphor 40. FIG. This is the same as the operation of the vehicular lamp 10 described in FIG.

また、本実施の形態に係る車両用灯具３００では、４つのＬＥＤモジュール３１２から出射された青色光を蛍光体モジュール３０に集光させ、白色光を生成しているので、車両用灯具３００が照射する照射光の輝度を高めることができる。   Further, in the vehicle lamp 300 according to the present embodiment, the blue light emitted from the four LED modules 312 is condensed on the phosphor module 30 to generate white light. The brightness of the irradiated light can be increased.

また、車両用灯具３００では、４つのＬＥＤモジュール３１２の半導体発光素子３２から出射された青色光が楕円鏡３１４により集光されて蛍光体モジュール３０の蛍光体４０に入射する構成となっている。従って、蛍光体４０と各ＬＥＤモジュール３１２の半導体発光素子３２とが離間して設けられているので、半導体発光素子３２の発生した熱が蛍光体４０に伝わり難くなり、蛍光体４０の熱による劣化を抑制できる。また、蛍光体４０の温度上昇により起こる発光輝度の低下を抑制できるので、車両用灯具３００のが照射する照射光の輝度をより高めることができる。   Further, the vehicular lamp 300 is configured such that the blue light emitted from the semiconductor light emitting elements 32 of the four LED modules 312 is collected by the elliptical mirror 314 and enters the phosphor 40 of the phosphor module 30. Accordingly, since the phosphor 40 and the semiconductor light emitting element 32 of each LED module 312 are provided apart from each other, the heat generated by the semiconductor light emitting element 32 is difficult to be transmitted to the phosphor 40 and the phosphor 40 is deteriorated by heat. Can be suppressed. Moreover, since the fall of the light emission brightness which arises by the temperature rise of the fluorescent substance 40 can be suppressed, the brightness | luminance of the irradiation light which the vehicle lamp 300 irradiates can be raised more.

図４は、本発明のさらに別の実施の形態に係る車両用灯具４００の側断面図である。図４に示す車両用灯具４００において、図１に示す車両用灯具１０と同一または対応する構成要素については、同一の符号を用いるとともに、適宜説明を省略する。   FIG. 4 is a side sectional view of a vehicular lamp 400 according to still another embodiment of the present invention. In the vehicular lamp 400 shown in FIG. 4, the same or corresponding components as those in the vehicular lamp 10 shown in FIG.

本実施の形態に係る車両用灯具４００もまた、図１に示す車両用灯具１０と同様にプロジェクト型の灯具ユニットであるが、本実施の形態に係る車両用灯具４００では、ＬＥＤモジュール４１２が鉛直上方向に光を照射するように構成されている点が図１に示す車両用灯具１０と異なる。ＬＥＤモジュール４１２は、照射光学系１６におけるリフレクタ２４の第１焦点にその発光中心が位置するように、支持部材２６の上面に固定されている。また、車両用灯具４００では、ＬＥＤモジュール４１２は、半導体発光素子、波長選択フィルタおよび蛍光体を有しており、白色光を出射する。ＬＥＤモジュール４１２の詳細な構成については後述する。   The vehicle lamp 400 according to the present embodiment is also a project-type lamp unit similar to the vehicle lamp 10 shown in FIG. 1, but in the vehicle lamp 400 according to the present embodiment, the LED module 412 is vertical. The vehicle lamp 10 shown in FIG. 1 is different from the vehicle lamp 10 in that light is emitted upward. The LED module 412 is fixed to the upper surface of the support member 26 so that the light emission center is located at the first focal point of the reflector 24 in the irradiation optical system 16. In the vehicle lamp 400, the LED module 412 includes a semiconductor light emitting element, a wavelength selection filter, and a phosphor, and emits white light. The detailed configuration of the LED module 412 will be described later.

このように構成された車両用灯具４００において、ＬＥＤモジュール４１２から放射された白色光は、リフレクタ２４の反射面２４ａにより光軸Ａｘ寄りに集光反射された後、投影レンズ２２を介して前方に照射される。   In the vehicular lamp 400 configured as described above, the white light emitted from the LED module 412 is condensed and reflected toward the optical axis Ax by the reflecting surface 24a of the reflector 24, and then forward through the projection lens 22. Irradiated.

図５は、図４に示す車両用灯具４００に用いられるＬＥＤモジュール４１２の側断面図である。図５に示すように、ＬＥＤモジュール４１２は、基板４０２と、基板４０２上に設けられた半導体発光素子４０４と、半導体発光素子４０４上に設けられた波長選択フィルタ４０６と、波長選択フィルタ４０６上に設けられた蛍光体４０８と、半導体発光素子４０４、波長選択フィルタ４０６および蛍光体４０８を封止する封止部材４１０とを備える。   FIG. 5 is a side sectional view of the LED module 412 used in the vehicular lamp 400 shown in FIG. As shown in FIG. 5, the LED module 412 includes a substrate 402, a semiconductor light emitting element 404 provided on the substrate 402, a wavelength selection filter 406 provided on the semiconductor light emitting element 404, and a wavelength selection filter 406. A provided phosphor 408 and a sealing member 410 that seals the semiconductor light emitting element 404, the wavelength selection filter 406, and the phosphor 408 are provided.

半導体発光素子４０４は、波長４００〜４８５ｎｍ程度の青色光を照射する青色ＬＥＤである。波長選択フィルタ４０６は、半導体発光素子４０４の上面に、たとえば蒸着により形成された誘電体多層膜である。または、蛍光体４０８の下面にたとえば蒸着により誘電体多層膜を形成したものを半導体発光素子４０４上に載置してもよい。蛍光体４０８は、ＹＡＧ蛍光物質により形成される蛍光体である。   The semiconductor light emitting element 404 is a blue LED that emits blue light having a wavelength of about 400 to 485 nm. The wavelength selection filter 406 is a dielectric multilayer film formed on the upper surface of the semiconductor light emitting element 404 by, for example, vapor deposition. Or what formed the dielectric multilayer in the lower surface of the fluorescent substance 408 by vapor deposition may be mounted on the semiconductor light emitting element 404, for example. The phosphor 408 is a phosphor formed of a YAG phosphor material.

ＬＥＤモジュール４１２において、波長選択フィルタ４０６は、半導体発光素子４０４からの青色光を透過して、蛍光体４０８から発せられた黄色光を反射するよう形成される。   In the LED module 412, the wavelength selection filter 406 is formed so as to transmit blue light from the semiconductor light emitting element 404 and reflect yellow light emitted from the phosphor 408.

このように構成されたＬＥＤモジュール４１２において、半導体発光素子４０４が発生した青色光は、波長選択フィルタ４０６の下面に入射する。波長選択フィルタ４０６に入射した青色光は、略全て波長選択フィルタ４０６を透過し、蛍光体４０８の下面に入射する。   In the LED module 412 configured as described above, the blue light generated by the semiconductor light emitting element 404 is incident on the lower surface of the wavelength selection filter 406. The blue light incident on the wavelength selection filter 406 passes through the wavelength selection filter 406 and enters the lower surface of the phosphor 408.

青色光が蛍光体４０８に入射すると、蛍光体４０８におけるＹＡＧ蛍光物質は青色光の一部により励起され、黄色光を発生する。この黄色光は、蛍光体４０８から等方的に放射されるため、一部は蛍光体４０８の上方に直接放射されるが、一部は蛍光体４０８の下方に放射される。蛍光体４０８の下方に向けて放射された黄色光は、波長選択フィルタ４０６の上面に入射するが、波長選択フィルタ４０６は、黄色光を反射するように形成されているため、略全ての黄色光が波長選択フィルタ４０６により反射されて、蛍光体４０８の下面に入射し、蛍光体４０８の上面から出射される。また、蛍光体４０８の上面からは、蛍光体４０８を励起せずに透過する青色光も出射される。   When blue light is incident on the phosphor 408, the YAG phosphor in the phosphor 408 is excited by part of the blue light and generates yellow light. Since this yellow light is emitted isotropically from the phosphor 408, a part is emitted directly above the phosphor 408, but a part is emitted below the phosphor 408. Although the yellow light emitted toward the lower side of the phosphor 408 is incident on the upper surface of the wavelength selection filter 406, the wavelength selection filter 406 is formed so as to reflect the yellow light. Is reflected by the wavelength selection filter 406, enters the lower surface of the phosphor 408, and exits from the upper surface of the phosphor 408. Further, blue light that passes through the phosphor 408 without being excited is also emitted from the upper surface of the phosphor 408.

従って、蛍光体４０８の上面からは、蛍光体４０８を透過した青色光と、蛍光体４０８から直接放射された黄色光と、波長選択フィルタ４０６により反射された黄色光とが出射され、これらの光が合わさることにより、白色光が生成される。生成された白色光は、車両用灯具４００の照射光学系１６により配光制御され、灯具前方に向けて照射される。   Therefore, from the upper surface of the phosphor 408, blue light transmitted through the phosphor 408, yellow light directly emitted from the phosphor 408, and yellow light reflected by the wavelength selection filter 406 are emitted. When combined, white light is generated. The generated white light is subjected to light distribution control by the irradiation optical system 16 of the vehicular lamp 400 and irradiated toward the front of the lamp.

このように、本実施の形態に係る車両用灯具４００によれば、蛍光体４０８から等方的に放射された黄色光のうち、波長選択フィルタ４０６の方向に放射された黄色光は、波長選択フィルタ４０６により反射され、蛍光体４０８の上方へと出射される。これにより、光の利用効率が向上され、車両用灯具４００の輝度を高めることができる。   As described above, according to the vehicular lamp 400 according to the present embodiment, among the yellow light emitted isotropically from the phosphor 408, the yellow light emitted in the direction of the wavelength selection filter 406 is wavelength selected. The light is reflected by the filter 406 and emitted upward of the phosphor 408. Thereby, the utilization efficiency of light can be improved and the brightness of the vehicular lamp 400 can be increased.

以上、実施の形態をもとに本発明を説明した。これらの実施形態は例示であり、各構成要素や各処理プロセスの組合せにいろいろな変形例が可能なこと、またそうした変形例も本発明の範囲にあることは当業者に理解されるところである。   The present invention has been described above based on the embodiment. It should be understood by those skilled in the art that these embodiments are exemplifications, and that various modifications can be made to the combination of each component and each processing process, and such modifications are also within the scope of the present invention.

上述の実施の形態では、半導体発光素子として青色ＬＥＤを用いたが、たとえば波長が４００ｎｍ前後程度の紫外光を照射する半導体発光素子を用いてもよい。この場合、蛍光体として、紫外光の照射により赤色光、緑色光および青色光をそれぞれ発生する蛍光物質により構成されたものを用いる。また、波長選択フィルタとして、紫外光を透過するが、赤色光、緑色光および青色光を反射する特性のものを用いる。これにより、蛍光体により放射された光のうち、波長選択フィルタ方向に放射された光を取り出すことができるので、光の利用効率を向上できる。   In the above-described embodiment, the blue LED is used as the semiconductor light emitting element. However, for example, a semiconductor light emitting element that emits ultraviolet light having a wavelength of about 400 nm may be used. In this case, a phosphor made of a fluorescent material that generates red light, green light, and blue light by irradiation with ultraviolet light is used. Further, a wavelength selection filter having a characteristic of transmitting ultraviolet light but reflecting red light, green light, and blue light is used. Thereby, since the light radiated | emitted in the wavelength selection filter direction among the lights radiated | emitted by fluorescent substance can be taken out, the utilization efficiency of light can be improved.

また、上述の実施の形態では、プロジェクタ型の照明光学系用いて車両用灯具を構成したが、照明光学系の構成としてはこれに限られない。たとえば、放物面（パラボラ）状の反射鏡を用いて蛍光体から出射された白色光を前方に照射するパラボラ型の照射光学系や、蛍光体から出射された白色光を投影レンズにより直接前方に照射する直射型の照明光学系を用いて車両用灯具を構成してもよい。   In the above-described embodiment, the vehicular lamp is configured using the projector-type illumination optical system. However, the configuration of the illumination optical system is not limited thereto. For example, a parabolic irradiation optical system that irradiates the white light emitted from the phosphor forward using a parabolic reflector, or the white light emitted from the phosphor directly in front of the projection lens. The vehicular lamp may be configured using a direct-type illumination optical system that irradiates the light.

本発明の実施の形態に係る車両用灯具を示す側断面図である。1 is a side sectional view showing a vehicular lamp according to an embodiment of the present invention. 本発明の実施の形態に係る車両用灯具の作用を説明するための図である。It is a figure for demonstrating the effect | action of the vehicle lamp which concerns on embodiment of this invention. 本発明の別の実施の形態に係る車両用灯具の側断面図である。It is a sectional side view of the vehicle lamp which concerns on another embodiment of this invention. 本発明のさらに別の実施の形態に係る車両用灯具の側断面図である。It is a sectional side view of the vehicle lamp which concerns on another embodiment of this invention. 図４に示す車両用灯具に用いられるＬＥＤモジュールの側断面図である。It is a sectional side view of the LED module used for the vehicle lamp shown in FIG.

符号の説明Explanation of symbols

１０、３００、４００ 車両用灯具、 １２、３１２、４１２ ＬＥＤモジュール、 １４、３１４ 楕円鏡、 １６ 照射光学系、 ２２ 投影レンズ、 ２４ リフレクタ、 ２６ 支持部材、 ３０ 蛍光体モジュール、 ３２、４０４ 半導体発光素子、 ４０、４０８ 蛍光体、 ４２、４０６ 波長選択フィルタ。   10, 300, 400 Vehicle lamp, 12, 312, 412 LED module, 14, 314 elliptical mirror, 16 irradiation optical system, 22 projection lens, 24 reflector, 26 support member, 30 phosphor module, 32, 404 semiconductor light emitting device , 40, 408 phosphor, 42, 406 wavelength selective filter.

Claims (4)

半導体発光素子と、
外部から光を照射されることにより、照射光とは異なる波長を有する光を発する蛍光体と、
前記半導体発光素子と前記蛍光体との間に設けられ、前記半導体発光素子からの光を透過して、前記蛍光体から発せられた光を反射する波長選択フィルタと、
前記蛍光体から直接発せられた光および前記波長選択フィルタにより反射された光を、所定の照射方向に照射する照射光学系と、
を備えることを特徴とする車両用灯具。 A semiconductor light emitting device;
A phosphor that emits light having a wavelength different from the irradiated light by being irradiated with light from the outside;
A wavelength selection filter that is provided between the semiconductor light emitting element and the phosphor, transmits light from the semiconductor light emitting element, and reflects light emitted from the phosphor;
An irradiation optical system for irradiating light emitted directly from the phosphor and light reflected by the wavelength selection filter in a predetermined irradiation direction;
A vehicular lamp characterized by comprising: 前記半導体発光素子は、前記波長選択フィルタから離間して設けられており、
前記半導体発光素子からの光を前記波長選択フィルタに集光する集光光学部材をさらに備えることを特徴とする請求項１に記載の車両用灯具。 The semiconductor light emitting element is provided apart from the wavelength selection filter,
The vehicular lamp according to claim 1, further comprising a condensing optical member that condenses light from the semiconductor light emitting element onto the wavelength selection filter. 複数の前記半導体発光素子と、複数の半導体発光素子に対応して設けられた複数の集光光学部材と、を備え、
前記複数の集光光学部材のそれぞれは、対応する半導体発光素子が発生する光を、前記波長選択フィルタに集光することを特徴とする請求項２に記載の車両用灯具。 A plurality of the semiconductor light emitting elements, and a plurality of condensing optical members provided corresponding to the plurality of semiconductor light emitting elements,
3. The vehicular lamp according to claim 2, wherein each of the plurality of condensing optical members condenses light generated by a corresponding semiconductor light emitting element on the wavelength selection filter. 前記集光光学部材は、楕円鏡であって、
前記楕円鏡の第１焦点に前記半導体発光素子を設け、前記楕円鏡の第２焦点に前記波長選択フィルタを設けることを特徴とする請求項２または３に記載の車両用灯具。 The condensing optical member is an elliptical mirror,
4. The vehicular lamp according to claim 2, wherein the semiconductor light emitting element is provided at a first focal point of the elliptical mirror, and the wavelength selection filter is provided at a second focal point of the elliptical mirror.
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