JP2004039458A - Vehicular lamp - Google Patents

Vehicular lamp Download PDF

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Publication number
JP2004039458A
JP2004039458A JP2002195348A JP2002195348A JP2004039458A JP 2004039458 A JP2004039458 A JP 2004039458A JP 2002195348 A JP2002195348 A JP 2002195348A JP 2002195348 A JP2002195348 A JP 2002195348A JP 2004039458 A JP2004039458 A JP 2004039458A
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JP
Japan
Prior art keywords
lamp
led light
outer lens
light sources
reflector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
JP2002195348A
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Japanese (ja)
Inventor
Masaya Ookawato
大河戸 昌也
Ryujiro Ikuta
生田 龍治郎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ichikoh Industries Ltd
Original Assignee
Ichikoh Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ichikoh Industries Ltd filed Critical Ichikoh Industries Ltd
Priority to JP2002195348A priority Critical patent/JP2004039458A/en
Publication of JP2004039458A publication Critical patent/JP2004039458A/en
Abandoned legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60QARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/26Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
    • B60Q1/2607Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic comprising at least two indicating lamps
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60QARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/0029Spatial arrangement
    • B60Q1/0041Spatial arrangement of several lamps in relation to each other
    • B60Q1/0052Spatial arrangement of several lamps in relation to each other concentric
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/13Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
    • F21S43/14Light emitting diodes [LED]
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235Light guides
    • F21S43/236Light guides characterised by the shape of the light guide
    • F21S43/237Light guides characterised by the shape of the light guide rod-shaped
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235Light guides
    • F21S43/242Light guides characterised by the emission area
    • F21S43/243Light guides characterised by the emission area emitting light from one or more of its extremities
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235Light guides
    • F21S43/247Light guides with a single light source being coupled into the light guide
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235Light guides
    • F21S43/251Light guides the light guides being used to transmit light from remote light sources
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/40Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the combination of reflectors and refractors

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular lamp allowing different illumination functions on a light emitting surface of one outer lens to be easily distinguished from one another, while keeping small thickness of a lamp body, and preventing degradation of its appearance. <P>SOLUTION: This vehicular lamp is equipped with: the outer lens 13 for closing an front opening 12a of a lamp housing 12; a plurality of LED light sources 15a-15j disposed in a lamp chamber 14 formed with the lamp housing 12 and the outer lens 13; a Fresnel lens 16 for converting light generated by lighting the respective light sources 15a-15j; an obliquely installed reflector 17 having a surface formed into a stepped shape so as to reflect nearly parallel luminous flux toward the outer lens 13 and disposed in an inclined form in the lamp chamber 14; recessed reflectors 17c each formed at a part of the reflector 17; and light guide members 21 for guiding the light generated from at least one light source 15c out of the plurality of light sources 15a-15j to the recessed reflector 17c. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、発光面積の拡大を図りつつ灯具本体の薄型化を実現した車両用灯具に関する。
【0002】
【従来の技術】
従来から、車両用灯具には、その光源としてLED光源を用いたものが知られている。
【0003】
図8(A)は、このような車両用灯具1を示し、前面開口2aを有するランプハウジング2と、前面開口2aを閉成するアウターレンズ3と、ランプハウジング2とアウターレンズ3とで形成された灯室4に配置の複数の(図7では一つのみ図示)LED光源5と、LED光源5の点灯に伴う発生光をアウターレンズ3に向けて平行光束とするフレネルレンズ6とを備えている。
【0004】
このような車両用灯具1では、発光面積の小さいLED光源5をフレネルレンズ6の焦点面に配設し、LED光源5の点灯に伴う発生光をフレネルレンズ6のレンズ作用によって拡大して平行光束としてアウターレンズ3から外部に向けて照明光束として出射させるようにしている。
【0005】
【発明が解決しようとする課題】
しかしながら、このような従来の車両用灯具1では、発光面積を広く確保しようとすると、フレネルレンズ6の焦点距離を長くしなければならず、ランプハウジング2の奥行きTが長くなり、灯具全体の薄型化を図りがたいという不都合がある。
【0006】
また、車両用灯具1を前方から視認したとき、アウターレンズ3の外形形状は正方形とは限らないことから、図8(B)に示すように、長方形状を基本としたデザインとした場合には、フレネルレンズ6の形状もそれに合わせた長方形状としなければならない。
【0007】
そして、フレネルレンズ6をアウターレンズ3の形状に合わせた長方形状とすると、LED光源5の発生光の拡散領域に対して、照明光束として使用されない領域R1,R2ができてしまい、光の利用効率が低下するという問題も生じていた。
【0008】
このような利用効率の低下は、照明光束の光量(輝度)を確保しようとする場合には、LED光源5の数を増やす必要があり、車両用灯具1の全体の価格が高騰するという問題にもなってしまう。
【0009】
そこで、図7に示すように、ランプハウジング2を薄型化し、LED光源5並びにフレネルレンズ6を灯室4の端部(図示下方)に接近して設けると共に、灯室4内にアウターレンズ3に対して斜めになるようにレンズリフレクター7を設け、このレンズリフレクター7に、LED光源5からの発生光をフレネルレンズ6で平行光束とした上でアウターレンズ3に向けて反射する反射面7aを段差状に設ける構成とした車両用灯具8とすることが考えられる。
【0010】
一方、このような車両用灯具8を使用して、一つのアウターレンズ3で異なった照明機能を具備させる場合、例えば、テールランプ機能とストップランプ機能とを具備させる場合には、テールランプ機能時のLED光源5の光量(輝度)とストップランプ機能時のLED光源5の光量(輝度)とを異ならせる必要が生じる。
【0011】
そこで、このような場合には、テールランプ機能時のLED光源5の電圧とストップランプ機能時のLED光源5の電圧とを変えたり、テールランプ機能時のLED光源5の点灯数をストップランプ機能時のLED光源5の点灯数よりも少なくする必要がある。
【0012】
しかしながら、このような電圧変換や点灯数の切り替えでは、一つのアウターレンズ3の発光面全体の輝度がテールランプ機能時とストップランプ機能時とで異なるのみであって、一つのアウターレンズ3での発光面上で異なった照明機能を同時に提示することはできなかった。
【0013】
尚、一つのアウターレンズ3の発光面上で異なった照明機能を同時に提示するものとしては、例えば、クリアランスランプ機能とターンシグナルランプ機能とを具備した車両用灯具が知られているが、このような場合、ターンシグナルランプ機能用としての照明色を確保するために、光源を有色キャップで覆ったり、光源自体に有色塗装を施すなどの処理を行っているため、非点灯時であっても外部から有色キャップや有色光源が見えてしまって見栄えを損なうという問題が生じる。
【0014】
本発明は、上記の事情に鑑みて為されたもので、その目的とするところは、灯具本体の薄型化を維持しつつ、一つのアウターレンズの発光面上での異なった照明機能を容易に区別可能とすることができ、しかも、見栄えを損なうことを防止することができる車両用灯具を提供することにある。
【0015】
【課題を解決するための手段】
その目的を達成するため、請求項1に記載の車両用灯具は、ランプハウジングの前面開口を閉成するアウターレンズと、前記ランプハウジングと前記アウターレンズとによって形成された灯室内に配置の複数のLED光源と、該各LED光源の点灯に伴う発生光を略平行光束に変換する光源部と、前記略平行光束を前記アウターレンズに向けて反射するように表面が段差状に形成され且つ前記灯室内に傾斜状態で配置された斜設リフレクターと、該斜設リフレクターの一部に形成された凹状リフレクターと、前記複数のLED光源のうちの少なくとも一つのLED光源からの発生光を前記凹状リフレクターに導く導光部材とを備えていることを特徴とする。
【0016】
また、請求項2に記載の車両用灯具は、前記斜設リフレクターで反射された照明色と前記凹状リフレクターで反射された照明色とは、その色合いが異なることを特徴とする。
【0017】
また、請求項3に記載の車両用灯具は、前記複数のLED光源のうちの前記少なくとも一つのLED光源は、前記複数のLED光源の他のLED光源と独立して点灯することを特徴とする。
【0018】
さらに、請求項4に記載の車両用灯具は、前記複数のLED光源の点灯に伴う発生光を前記導光部材に導びかないようにする切替機構を有することを特徴とする。
【0019】
【発明の実施の形態】
次に、本発明の車両用灯具の実施の形態を、リヤコンビネーションランプとしてのテールランプとストップランプとを具備させた場合に適用し、図面に基づいて説明する。
【0020】
(実施の形態1)
図1乃至図5は、本発明の車両用灯具の実施の形態1を示す。
【0021】
図1乃至図3において、車両用灯具11は、前面開口12aを有するランプハウジング12と、前面開口12aを閉成するアウターレンズ13と、ランプハウジング12とアウターレンズ13とで形成された灯室14に配置の複数個のLED光源15a〜15jと、LED光源15a〜15jの前方に配置された光源部としてのフレネルレンズ16と、灯室14内にアウターレンズ13に対して斜めに設けられた斜設リフレクター17とを備えている。
【0022】
アウターレンズ13は、ここでは、透明レンズであり、その内面(灯室14側)にシリンドリカルレンズ、或いは、格子状や多角形状等のプリズムを設けることができる。また、アウターレンズ13の図示下方には、LED光源15a〜15j並びにフレネルレンズ16が外部から透けて見えないように塗装膜13aが設けられている。
【0023】
尚、この塗装膜13aの替わりにローレット加工や再帰プリズム加工を施すなどの他の処理や部材を設けることによって外部から見えないようにすることもでき、従来技術で説明したターンシグナルランプ用の光源のような直射光の照明方式を採用していないことから、LED光源15a〜15jが有色であっても外部から透けて見えることが無いようにすることの容易化が図られている。
【0024】
LED光源15a〜15jは、本実施の形態では赤色LEDが用いられ、灯室14の隅寄り(図示下方)に幅方向並びに奥行き方向に配列されている。また、アウターレンズ13寄りの中央の一つのLED光源15cは、その他のLED光源15a,15b,15d〜15jとは独立して点灯する。符号18は、これらLED光源15a〜15jの点灯を制御する回路素子が配列された回路基板である。
【0025】
フレネルレンズ16は、LED光源15a,15b,15d〜15jの点灯に伴う発生光を平行光束とする。尚、フレネルレンズ16に替えて、図4(A)に示すように、導光性を有するレンズ部材19に反射面19aを設けたものを光源部としたり、或いは、図4(B)に示すように、リフレクタ20を光源部とするなど、LED光源15a,15b,15d〜15jの点灯に伴う発生光を平行光束とすることができれば良いので、特に限定されるものではない。
【0026】
斜設リフレクター17は、図5(A)に拡大して示すように、その表面側に平行光束を反射する反射面17aと、平行光束と略平行な平行面17bとが交互に形成され、これにより段差状とされている。また、斜設リフレクター17の一部(図示上下二箇所)には、凹状リフレクター17cが形成されている。
【0027】
尚、図5(B)に示すように、斜設リフレクター17の背面に反射皮膜17dを設け(例えば、塗装やアルミの真空蒸着)、この反射皮膜17dにより平行光束を反射させても良い。このような反射皮膜17dを設けた場合、反射面17aは入射面、平行面17bは出射面となる。また、これら入出射面をプリズム(シリンドリカルや格子状)としたり、入反射面又は反射皮膜17dの反射率や屈折率を異ならせて配光規制を施すことも可能である。
【0028】
凹状リフレクター17cには、一端面(入射面)がLED光源15cと対向する光ファイバー素材等から形成された導光部材21の他端面(出射面)が臨んでおり、これによりLED光源15cの点灯に伴う発生光をアウターレンズ13に向けて平行光束として反射する。尚、この凹状リフレクター17cは、斜設リフレクター17の灯室14内での傾斜設置により凹状リフレクター17の背面に形成される空間を利用することができるので、ランプハウジング12の薄型化を犠牲にすることなく形成することができる。
【0029】
ところで、凹状リフレクター17cの形状は真円形状に限定されるものではなく、舟形状や多角形状等でもよい。また、その反射機能としては、導光部材21の他端面から出射されたLED光源15cからの発生光をアウターレンズ13に向けて反射すれば平行光束に限定されるものではなく、使用される照明機能を満足するように、回転放物面、自由曲面、双曲面、楕円曲面から形成することも可能である。また、反射面を分割しても良い。
【0030】
上記の構成において、例えば、夜間走行におけるテールランプ機能として使用する場合には、図2に示すように、LED光源15a,15b,15d〜15jを点灯させることにより、その発生光がフレネルレンズ16により平行光束とされた後、反射面17aにより反射され、アウターレンズ13の所定箇所を除いた面が均一に発光した照明光束とすることができる。
【0031】
また、昼間走行におけるブレーキペダルの踏み込みに連動したブレーキランプ機能として使用する場合には、図3に示すように、LED光源15cを点灯させることにより、その発生光が導光部材21を経由して出射面から出射された後、凹状リフレクター17cにより反射され、アウターレンズ13の所定箇所が集中的に発光した照明光束とすることができる。
【0032】
さらに、夜間走行におけるブレーキペダルの踏み込み時においては、図1に示すように、LED光源15a,15b,15d〜15jの点灯に伴うアウターレンズ13の所定箇所を除いた面の均一発光と、LED光源15cの点灯に伴うアウターレンズ13の所定箇所の集中的発光とを同時に行うことができる。
【0033】
この際、LED光源15cの発生光を凹状リフレクタ17cに集中させることにより、LED光源15a,15b,15d〜15jの点灯に伴うアウターレンズ13の所定箇所を除いた面の発光量(輝度)に対して、LED光源15cの点灯に伴うアウターレンズ13の所定箇所での集中発光量(輝度)を多くすることができ、識別性、即ち、同系色でありながら明るさ(色合い)の異なる照明色により容易に区別することができる。
【0034】
(実施の形態2)
図6は本発明の車両用灯具の実施の形態2を示す。尚、この図6に示した車両用灯具31において、上記実施の形態1と機能的に同一の構成には、同一の符号を付してその説明を省略する。この実施の形態2では、上記実施の形態1が縦長の矩形の外形であったのに対し、真円の外形としたものである。
【0035】
図6において、LED光源15a,15b,15cは灯室14の略中心に配置されている。尚、LED光源15a,15b,15c以外の配置は図示を省略するが、回路基板18を円柱状若しくは角柱状とすることにより放射状の発生光とすることができる。
【0036】
アウターレンズ13の中心寄りの裏面には、リフレックスリフレクタ(公知の再帰反射レンズ)22が設けられている。このリフレックスリフレクタ22は、LED光源15a,15b,15c並びに回路基板18が外部から透けて見えないようにする機能を兼ねている。
【0037】
そして、このような構成においても、LED光源15a,15bを点灯させた際にはアウターレンズ13の所定箇所並びにリフレックスリフレクタ22を除いた面が均一に発光する。また、LED光源15cを点灯させた際にはアウターレンズ13の凹状リフレクタ17cに対応した部位が凹状リフレクタ17cの形状に合わせて集中的に発光する。さらに、LED光源15a,15b,15cを点灯させた際には、LED光源15a,15bの点灯によるアウターレンズ13の所定箇所並びにリフレックスリフレクタ22を除いた面の均一発光と、LED光源15cの点灯によるアウターレンズ13の凹状リフレクタ17cに対応した部位の集中的発光とを区別可能な光量(色合い)で提示することができる。
【0038】
ところで、LED光源15a〜15jの数や配列、設置位置(例えば、図示上下の二箇所)などは限定されるものではない。
【0039】
また、上記実施の形態1では、テールランプとストップランプとして説明したが、LED光源15a〜15jの色は照明機能に応じて赤色、橙色、青色、緑色等の公知のものを単独若しくは複数の加色等、適宜のものを使用することができる。また、LED光源15a〜15jの色のみではなく、アウターレンズ13、フレネルレンズ16、導光部材21の端面(LED光源15c側)を有色とし、これらの加色や補色により所望の照明色を確保することも可能である。
【0040】
例えば、LED光源15a,15b,15d〜15jに白色LEDを用いると共にアウターレンズ13を白色透明としてバックランプとし、LED光源15cに橙色LEDを用いてターンシグナルランプとする。或いは、LED光源15a〜15jに白色LEDを用いると共にアウターレンズ13を白色透明、フレネルレンズ16を橙色透明としてLED光源15a,15b,15d〜15jからの発生光はターンシグナルランプとし、LED光源15cに白色透明を用いてその発生光はバックランプとするなどが考えられる。
【0041】
また、導光部材21の入射面をLED光源15cから退避可能(例えば、ソレノイド等を使用)とし、常時は他のLED光源15a,15b,15d〜15jと同時に点灯して均一発光用として使用すると共に、ブレーキペダルの踏み込みに連動して導光部材21の入射面をLED光源15cに対向させて集中発光用として使用する等の切り替えも可能である。尚、このような切替機構はシャッター等でも良い。
【0042】
さらに、上記実施の形態1では、一つのLED光源15cに対して二つの導光部材21を使用したが、これらを対としてもよい。この際、それぞれを独立させることにより三つの照明機能を具備させることもできる。
【0043】
また、上記実施の形態1,2では、単純な長方形若しくは真円形としたものを開示したが、楕円形や矩形・異形等のデザイン上の変形に容易に対応することができることは勿論である。
【0044】
【発明の効果】
本発明に係わる車両用灯具は、以上説明したように構成したので、灯具本体の薄型化を維持しつつ、一つのアウターレンズの発光面上での異なった照明機能を容易に区別可能とすることができ、しかも、見栄えを損なうことを防止することができる。
【図面の簡単な説明】
【図1】本発明に係わる車両用灯具の実施の形態1を示し、(A)は二つの照明機能を同時に使用している状態の車両用灯具の正面図、(B)は二つの照明機能を同時に使用している状態の車両用灯具の縦断面図である。
【図2】本発明に係わる車両用灯具の実施の形態1を示し、(A)は一方の照明機能を使用している状態の車両用灯具の正面図、(B)は一方の照明機能を使用している状態の車両用灯具の縦断面図である。
【図3】本発明に係わる車両用灯具の実施の形態1を示し、(A)は他方の照明機能を使用している状態の車両用灯具の正面図、(B)は他方の照明機能を使用している状態の車両用灯具の縦断面図である。
【図4】(A)はLED光源からの発生光を平行光束とする変形例の断面図、(B)はLED光源からの発生光を平行光束とする他の変形例の断面図である。
【図5】(A)は斜設リフレクターの要部の拡大断面図、(B)は斜設リフレクターの他例の要部の拡大断面図である。
【図6】本発明に係わる車両用灯具の実施の形態2を示し、(A)は二つの照明機能を同時に使用している状態の車両用灯具の断面図、(B)は二つの照明機能を同時に使用している状態の車両用灯具の正面図である。
【図7】従来の車両用灯具を示し、(A)は車両用灯具の縦断面図、(B)は照明光束の利用領域を説明するための説明図である。
【図8】従来の車両用灯具の構成の他の例を示す縦断面図である。
【符号の説明】
11…車両用灯具
12…ランプハウジング
12a…前面開口
13…アウターレンズ
14…灯室
15a〜15j…LED光源
16…フレネルレンズ(光源部)
17…斜設リフレクター
17c…凹状リフレクター
21…導光部材
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicular lamp that achieves a reduction in the thickness of a lamp body while increasing an emission area.
[0002]
[Prior art]
Conventionally, a vehicular lamp using an LED light source as its light source is known.
[0003]
FIG. 8A shows such a vehicular lamp 1, which is formed by a lamp housing 2 having a front opening 2a, an outer lens 3 closing the front opening 2a, and the lamp housing 2 and the outer lens 3. A plurality of (only one is shown in FIG. 7) LED light sources 5 arranged in the lamp room 4 and a Fresnel lens 6 that converts light generated by lighting of the LED light sources 5 into a parallel light beam toward the outer lens 3. I have.
[0004]
In such a vehicle lamp 1, the LED light source 5 having a small light emitting area is disposed on the focal plane of the Fresnel lens 6, and the light generated by the lighting of the LED light source 5 is enlarged by the lens function of the Fresnel lens 6 to generate a parallel light flux. The light is emitted from the outer lens 3 to the outside as an illumination light flux.
[0005]
[Problems to be solved by the invention]
However, in such a conventional vehicle lamp 1, in order to secure a large light emitting area, the focal length of the Fresnel lens 6 must be increased, the depth T of the lamp housing 2 increases, and the overall thickness of the lamp decreases. There is an inconvenience that it is difficult to achieve this.
[0006]
Further, when the vehicle lamp 1 is viewed from the front, the outer shape of the outer lens 3 is not necessarily a square. Therefore, as shown in FIG. , The shape of the Fresnel lens 6 must also be rectangular.
[0007]
When the Fresnel lens 6 has a rectangular shape that matches the shape of the outer lens 3, regions R1 and R2 that are not used as an illumination light flux are formed with respect to a diffusion region of light generated by the LED light source 5, and light use efficiency is increased. However, there has also been a problem in that the number of the components decreases.
[0008]
Such a decrease in utilization efficiency is caused by the problem that the number of LED light sources 5 needs to be increased in order to secure the light amount (luminance) of the illumination light flux, and the overall price of the vehicle lamp 1 rises. Will also be.
[0009]
Therefore, as shown in FIG. 7, the lamp housing 2 is made thinner, and the LED light source 5 and the Fresnel lens 6 are provided close to the end of the lamp chamber 4 (downward in the figure). A lens reflector 7 is provided so as to be oblique to the lens reflector 7, and a reflection surface 7 a that reflects the light generated from the LED light source 5 into a parallel light beam by the Fresnel lens 6 and reflects toward the outer lens 3 is provided on the lens reflector 7. It is conceivable that the vehicular lamp 8 has a configuration provided in the shape of a circle.
[0010]
On the other hand, when such a vehicle lamp 8 is used to provide different illumination functions with one outer lens 3, for example, when a tail lamp function and a stop lamp function are provided, an LED for the tail lamp function is used. It is necessary to make the light amount (luminance) of the light source 5 different from the light amount (luminance) of the LED light source 5 at the time of the stop lamp function.
[0011]
Therefore, in such a case, the voltage of the LED light source 5 at the time of the tail lamp function and the voltage of the LED light source 5 at the time of the stop lamp function are changed, or the lighting number of the LED light source 5 at the time of the tail lamp function is changed. It is necessary to reduce the number of lighting of the LED light source 5.
[0012]
However, in such voltage conversion and switching of the number of lights, only the brightness of the entire light emitting surface of one outer lens 3 differs between the time of the tail lamp function and the time of the stop lamp function. Different lighting functions could not be presented simultaneously on the surface.
[0013]
As a device that simultaneously presents different lighting functions on the light emitting surface of one outer lens 3, for example, a vehicular lamp having a clearance lamp function and a turn signal lamp function is known. In such a case, the light source is covered with a colored cap or colored light is applied to the light source itself in order to secure the illumination color for the turn signal lamp function. This causes a problem in that the colored cap or the colored light source is seen from the camera and the appearance is impaired.
[0014]
The present invention has been made in view of the above circumstances, and an object thereof is to easily realize different lighting functions on the light emitting surface of one outer lens while maintaining the thinning of the lamp body. An object of the present invention is to provide a vehicular lamp that can be distinguished and that can prevent the appearance from being impaired.
[0015]
[Means for Solving the Problems]
In order to achieve the object, a vehicle lamp according to claim 1 includes an outer lens that closes a front opening of a lamp housing, and a plurality of lamps disposed in a lamp chamber formed by the lamp housing and the outer lens. An LED light source; a light source unit for converting light generated by lighting of each LED light source into a substantially parallel light beam; and a stepped surface formed so as to reflect the substantially parallel light beam toward the outer lens and the light source. An oblique reflector that is arranged in an inclined state in a room, a concave reflector formed on a part of the oblique reflector, and light generated from at least one LED light source of the plurality of LED light sources is transmitted to the concave reflector. And a light guide member for guiding the light.
[0016]
In the vehicle lighting device according to the second aspect, the illumination color reflected by the oblique reflector and the illumination color reflected by the concave reflector have different shades.
[0017]
Further, the vehicle lighting device according to claim 3 is characterized in that the at least one LED light source of the plurality of LED light sources is turned on independently of other LED light sources of the plurality of LED light sources. .
[0018]
Further, the vehicle lighting device according to the fourth aspect is characterized in that the vehicle lighting device has a switching mechanism that prevents generated light accompanying the lighting of the plurality of LED light sources from being guided to the light guide member.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of a vehicular lamp according to the present invention will be described with reference to the drawings, which is applied to a case where a tail lamp and a stop lamp as rear combination lamps are provided.
[0020]
(Embodiment 1)
1 to 5 show Embodiment 1 of a vehicle lamp according to the present invention.
[0021]
1 to 3, a vehicular lamp 11 includes a lamp housing 12 having a front opening 12a, an outer lens 13 for closing the front opening 12a, and a lamp chamber 14 formed by the lamp housing 12 and the outer lens 13. , A Fresnel lens 16 as a light source section disposed in front of the LED light sources 15a to 15j, and an obliquely provided obliquely with respect to the outer lens 13 in the lamp chamber 14. And a setting reflector 17.
[0022]
Here, the outer lens 13 is a transparent lens, and a cylindrical lens or a prism having a lattice shape or a polygonal shape can be provided on the inner surface (on the lamp room 14 side). Further, a coating film 13a is provided below the outer lens 13 so that the LED light sources 15a to 15j and the Fresnel lens 16 cannot be seen through from the outside.
[0023]
It should be noted that, by providing other processing or members such as knurling or recursive prism processing in place of the coating film 13a, it can be made invisible from the outside, and the light source for the turn signal lamp described in the prior art can be used. Since the direct light illumination method as described above is not employed, even if the LED light sources 15a to 15j are colored, it is easy to prevent the LED light sources 15a to 15j from being seen through from the outside.
[0024]
The LED light sources 15a to 15j use red LEDs in the present embodiment, and are arranged in the width direction and the depth direction near the corner of the lamp room 14 (downward in the figure). The one LED light source 15c at the center near the outer lens 13 is turned on independently of the other LED light sources 15a, 15b, 15d to 15j. Reference numeral 18 denotes a circuit board on which circuit elements for controlling lighting of the LED light sources 15a to 15j are arranged.
[0025]
The Fresnel lens 16 converts light generated by lighting of the LED light sources 15a, 15b, 15d to 15j into a parallel light flux. In addition, instead of the Fresnel lens 16, as shown in FIG. 4 (A), a light guide unit provided with a reflecting surface 19a on a lens member 19 having a light guiding property, or as shown in FIG. 4 (B). As described above, the light generated by the lighting of the LED light sources 15a, 15b, and 15d to 15j can be converted into a parallel light flux, for example, by using the reflector 20 as a light source unit.
[0026]
As shown in the enlarged view of FIG. 5A, the oblique reflector 17 has a reflection surface 17a that reflects a parallel light beam and a parallel surface 17b that is substantially parallel to the parallel light beam formed alternately on its surface side. The shape is a step. In addition, a concave reflector 17c is formed in a part (two upper and lower parts in the figure) of the oblique reflector 17.
[0027]
As shown in FIG. 5B, a reflective film 17d may be provided on the back surface of the oblique reflector 17 (for example, by coating or vacuum deposition of aluminum), and the parallel light may be reflected by the reflective film 17d. When such a reflection film 17d is provided, the reflection surface 17a is an incident surface, and the parallel surface 17b is an emission surface. It is also possible to control the light distribution by making these entrance / exit surfaces into prisms (cylindrical or lattice-like), or by changing the reflectivity or refractive index of the entrance / reflection surface or the reflection film 17d.
[0028]
One end surface (incident surface) faces the concave reflector 17c, and the other end surface (outgoing surface) of the light guide member 21 made of an optical fiber material or the like facing the LED light source 15c faces the LED reflector 15c. The resulting light is reflected toward the outer lens 13 as a parallel light flux. The concave reflector 17c can utilize the space formed on the back surface of the concave reflector 17 by the inclined installation of the oblique reflector 17 in the lamp chamber 14, so that the thickness of the lamp housing 12 is sacrificed. It can be formed without any.
[0029]
The shape of the concave reflector 17c is not limited to a perfect circle, but may be a boat shape, a polygon shape, or the like. The reflection function is not limited to a parallel light beam if the generated light from the LED light source 15c emitted from the other end surface of the light guide member 21 is reflected toward the outer lens 13, and the illumination used is It is also possible to form from a paraboloid of revolution, a free-form surface, a hyperboloid, or an elliptical surface to satisfy the function. Further, the reflection surface may be divided.
[0030]
In the above configuration, for example, when used as a tail lamp function in night driving, by turning on the LED light sources 15a, 15b, 15d to 15j as shown in FIG. After being converted into a light beam, the light can be converted into an illumination light beam that is reflected by the reflection surface 17a and uniformly emits light from the surface of the outer lens 13 excluding a predetermined portion.
[0031]
When used as a brake lamp function in conjunction with the depression of the brake pedal during daytime traveling, as shown in FIG. 3, by turning on the LED light source 15c, the generated light passes through the light guide member 21. After being emitted from the emission surface, the illumination light can be reflected by the concave reflector 17c and illuminated at a predetermined location of the outer lens 13 in a concentrated manner.
[0032]
Further, when the brake pedal is depressed during night driving, as shown in FIG. 1, uniform light emission on the surface of the outer lens 13 excluding a predetermined portion due to lighting of the LED light sources 15a, 15b, 15d to 15j, and Concentrated light emission of a predetermined portion of the outer lens 13 accompanying the lighting of 15c can be performed simultaneously.
[0033]
At this time, the light generated by the LED light source 15c is concentrated on the concave reflector 17c, so that the light emission amount (luminance) of the surface of the outer lens 13 excluding a predetermined portion due to the lighting of the LED light sources 15a, 15b, 15d to 15j is reduced. As a result, the amount of concentrated light emission (luminance) at a predetermined position of the outer lens 13 due to the lighting of the LED light source 15c can be increased, and the discrimination property, that is, the illumination colors of similar colors but different in brightness (hue) can be obtained. It can be easily distinguished.
[0034]
(Embodiment 2)
FIG. 6 shows a vehicle lamp according to a second embodiment of the present invention. In the vehicle lighting device 31 shown in FIG. 6, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. In the second embodiment, the first embodiment has a vertically long rectangular outer shape, but has a perfect circular outer shape.
[0035]
In FIG. 6, the LED light sources 15a, 15b, 15c are arranged substantially at the center of the lamp room 14. Although the arrangement other than the LED light sources 15a, 15b, and 15c is not shown, the generated light can be generated radially by forming the circuit board 18 into a cylindrical or prismatic shape.
[0036]
A reflex reflector (known retroreflective lens) 22 is provided on the back surface near the center of the outer lens 13. The reflex reflector 22 also has a function of preventing the LED light sources 15a, 15b, 15c and the circuit board 18 from being seen through from the outside.
[0037]
Then, even in such a configuration, when the LED light sources 15a and 15b are turned on, predetermined portions of the outer lens 13 and the surface excluding the reflex reflector 22 emit light uniformly. When the LED light source 15c is turned on, the portion of the outer lens 13 corresponding to the concave reflector 17c emits light in a concentrated manner according to the shape of the concave reflector 17c. Further, when the LED light sources 15a, 15b, and 15c are turned on, the uniform light emission of the surface excluding the predetermined portion of the outer lens 13 and the reflex reflector 22 by the lighting of the LED light sources 15a and 15b, and the lighting of the LED light source 15c And the concentrated light emission of the portion corresponding to the concave reflector 17c of the outer lens 13 can be presented with a light amount (color) that can be distinguished.
[0038]
Incidentally, the number and arrangement of the LED light sources 15a to 15j, the installation positions (for example, two upper and lower positions in the figure) are not limited.
[0039]
In the first embodiment, the tail lamp and the stop lamp have been described. However, the colors of the LED light sources 15a to 15j may be one or more of known colors such as red, orange, blue, and green depending on the illumination function. And the like can be used as appropriate. In addition to the colors of the LED light sources 15a to 15j, the outer lens 13, the Fresnel lens 16, and the end surface (the LED light source 15c side) of the light guide member 21 are colored, and a desired illumination color is secured by adding or complementing these colors. It is also possible.
[0040]
For example, a white LED is used for the LED light sources 15a, 15b, 15d to 15j, and the outer lens 13 is made white and transparent to be a back lamp, and an orange LED is used for the LED light source 15c to be a turn signal lamp. Alternatively, a white LED is used for the LED light sources 15a to 15j, the outer lens 13 is made white and transparent, and the Fresnel lens 16 is made orange and the light generated from the LED light sources 15a, 15b and 15d to 15j is turned signal lamps. It is conceivable that the generated light is used as a back lamp by using white and transparent.
[0041]
In addition, the incident surface of the light guide member 21 can be retracted from the LED light source 15c (for example, using a solenoid or the like), and is always turned on simultaneously with the other LED light sources 15a, 15b, 15d to 15j to be used for uniform light emission. At the same time, it is also possible to switch such that the incident surface of the light guide member 21 faces the LED light source 15c and use it for centralized light emission in conjunction with the depression of the brake pedal. Incidentally, such a switching mechanism may be a shutter or the like.
[0042]
Further, in the first embodiment, two light guide members 21 are used for one LED light source 15c, but these may be paired. At this time, three lighting functions can be provided by making each independent.
[0043]
Further, in the first and second embodiments, a simple rectangle or a perfect circle is disclosed. However, it is needless to say that it is possible to easily cope with a design deformation such as an ellipse, a rectangle, and an irregular shape.
[0044]
【The invention's effect】
Since the vehicular lamp according to the present invention is configured as described above, it is possible to easily distinguish different lighting functions on the light emitting surface of one outer lens while maintaining the thinning of the lamp body. And the appearance can be prevented from being impaired.
[Brief description of the drawings]
1A and 1B show a vehicle lamp according to a first embodiment of the present invention, wherein FIG. 1A is a front view of the vehicle lamp in a state where two lighting functions are used at the same time, and FIG. 1 is a longitudinal sectional view of a vehicular lamp in a state in which is used at the same time.
FIGS. 2A and 2B show a vehicle lamp according to a first embodiment of the present invention, wherein FIG. 2A is a front view of the vehicle lamp in a state where one of the lighting functions is used, and FIG. It is a longitudinal cross-sectional view of the vehicle lamp in use.
3A and 3B show a first embodiment of a vehicle lamp according to the present invention, in which FIG. 3A is a front view of the vehicle lamp in a state in which the other lighting function is used, and FIG. It is a longitudinal cross-sectional view of the vehicle lamp in use.
FIG. 4A is a cross-sectional view of a modification in which light generated from an LED light source is converted into a parallel light flux, and FIG. 4B is a cross-sectional view of another modification in which light generated from an LED light source is converted into a parallel light flux.
5A is an enlarged cross-sectional view of a main part of the oblique reflector, and FIG. 5B is an enlarged cross-sectional view of another main part of the oblique reflector.
FIGS. 6A and 6B show a vehicle lamp according to a second embodiment of the present invention, in which FIG. 6A is a cross-sectional view of the vehicle lamp in a state where two lighting functions are simultaneously used, and FIG. 1 is a front view of a vehicular lamp in a state in which is used at the same time.
7A and 7B show a conventional vehicular lamp, in which FIG. 7A is a longitudinal sectional view of the vehicular lamp, and FIG. 7B is an explanatory diagram for explaining a use area of the illumination light flux.
FIG. 8 is a longitudinal sectional view showing another example of the configuration of the conventional vehicle lamp.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Vehicle lamp 12 ... Lamp housing 12a ... Front opening 13 ... Outer lens 14 ... Light room 15a-15j ... LED light source 16 ... Fresnel lens (light source part)
17: Oblique reflector 17c: Concave reflector 21: Light guide member

Claims (4)

ランプハウジングの前面開口を閉成するアウターレンズと、前記ランプハウジングと前記アウターレンズとによって形成された灯室内に配置の複数のLED光源と、該各LED光源の点灯に伴う発生光を略平行光束に変換する光源部と、前記略平行光束を前記アウターレンズに向けて反射するように表面が段差状に形成され且つ前記灯室内に傾斜状態で配置された斜設リフレクターと、該斜設リフレクターの一部に形成された凹状リフレクターと、前記複数のLED光源のうちの少なくとも一つのLED光源からの発生光を前記凹状リフレクターに導く導光部材とを備えていることを特徴とする車両用灯具。An outer lens for closing a front opening of the lamp housing; a plurality of LED light sources disposed in a lamp chamber formed by the lamp housing and the outer lens; A light source unit, a slanted reflector whose surface is formed in a step shape so as to reflect the substantially parallel light beam toward the outer lens, and which is arranged in an inclined state in the lamp chamber; and A vehicular lamp comprising: a concave reflector formed in a part; and a light guide member for guiding light generated from at least one of the plurality of LED light sources to the concave reflector. 前記斜設リフレクターで反射された照明色と前記凹状リフレクターで反射された照明色とは、その色合いが異なることを特徴とする請求項1に記載の車両用灯具。The vehicular lamp according to claim 1, wherein the illumination color reflected by the oblique reflector and the illumination color reflected by the concave reflector have different shades. 前記複数のLED光源のうちの前記少なくとも一つのLED光源は、前記複数のLED光源の他のLED光源と独立して点灯することを特徴とする請求項1又は請求項2に記載の車両用灯具。The vehicular lamp according to claim 1 or 2, wherein the at least one LED light source of the plurality of LED light sources is turned on independently of other LED light sources of the plurality of LED light sources. . 前記複数のLED光源の点灯に伴う発生光を前記導光部材に導びかないようにする切替機構を有することを特徴とする請求項1又は請求項2に記載の車両用灯具。The vehicular lamp according to claim 1, further comprising a switching mechanism configured to prevent light generated due to lighting of the plurality of LED light sources from being guided to the light guide member. 4.
JP2002195348A 2002-07-04 2002-07-04 Vehicular lamp Abandoned JP2004039458A (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006004934A (en) * 2004-06-16 2006-01-05 Osram Sylvania Inc Light-emitting diode lamp having light pipe
KR100823702B1 (en) 2007-10-16 2008-04-18 엘이디라이텍(주) Room lamp for automobile
JP2009009745A (en) * 2007-06-26 2009-01-15 Ichikoh Ind Ltd Vehicle lamp
JP2009252465A (en) * 2008-04-04 2009-10-29 Stanley Electric Co Ltd Led lighting system
JP2013008674A (en) * 2011-06-23 2013-01-10 Visteon Global Technologies Inc Reflector signal lamp with hidden light source
CN103017056A (en) * 2011-09-26 2013-04-03 株式会社小糸制作所 Vehicular lamp
JP2014157787A (en) * 2013-02-18 2014-08-28 Ichikoh Ind Ltd Vehicular light guide member, vehicular lighting fixture
JP2015011965A (en) * 2013-07-02 2015-01-19 スタンレー電気株式会社 Lighting appliance for performance
JP2016146317A (en) * 2015-01-29 2016-08-12 技研株式会社 Optical decoration device
EP2581647A3 (en) * 2011-10-14 2017-12-13 Koito Manufacturing Co., Ltd. Vehicular lamp

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006004934A (en) * 2004-06-16 2006-01-05 Osram Sylvania Inc Light-emitting diode lamp having light pipe
KR101168429B1 (en) 2004-06-16 2012-07-25 오스람 실바니아 인코포레이티드 LED light source
JP2009009745A (en) * 2007-06-26 2009-01-15 Ichikoh Ind Ltd Vehicle lamp
KR100823702B1 (en) 2007-10-16 2008-04-18 엘이디라이텍(주) Room lamp for automobile
JP2009252465A (en) * 2008-04-04 2009-10-29 Stanley Electric Co Ltd Led lighting system
JP2013008674A (en) * 2011-06-23 2013-01-10 Visteon Global Technologies Inc Reflector signal lamp with hidden light source
CN103017056A (en) * 2011-09-26 2013-04-03 株式会社小糸制作所 Vehicular lamp
EP2581647A3 (en) * 2011-10-14 2017-12-13 Koito Manufacturing Co., Ltd. Vehicular lamp
JP2014157787A (en) * 2013-02-18 2014-08-28 Ichikoh Ind Ltd Vehicular light guide member, vehicular lighting fixture
JP2015011965A (en) * 2013-07-02 2015-01-19 スタンレー電気株式会社 Lighting appliance for performance
JP2016146317A (en) * 2015-01-29 2016-08-12 技研株式会社 Optical decoration device

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