JP3760865B2

JP3760865B2 - Vehicle headlamp

Info

Publication number: JP3760865B2
Application number: JP2002001430A
Authority: JP
Inventors: 哲小宮
Original assignee: Nissan Motor Co Ltd
Current assignee: Nissan Motor Co Ltd
Priority date: 2002-01-08
Filing date: 2002-01-08
Publication date: 2006-03-29
Anticipated expiration: 2022-01-08
Also published as: JP2003203508A

Description

【０００１】
【発明の属する技術分野】
本発明は車両用前照灯に関する。
【０００２】
【従来の技術】
従来の車両用前照灯には、ハウジングと、このハウジングに組み付けられて該ハウジングとの間に灯室を形成するアウターレンズと、前記灯室内に設けられ光源バルブの照射光を所定配光方向に反射するリフレクタと、前記ハウジングと前記リフレクタとの間の隙間を隠すインナーパネルと、を備えて構成されるものがある。
【０００３】
【発明が解決しようとする課題】
近年、この種の車両用前照灯は車両前端から車両側方または車両上方への回り込み量が大きくなる傾向にあり、これに伴ってインナーパネルの回り込み量も大きくなる傾向にある。このインナーパネルの回り込み部は光源バルブからの直接光が届かない範囲であるため、従来の車両用前照灯にあっては発光面であるリフレクタに対して非発光である回り込み部の割合いが大きくなり、灯具全体としてみると有効発光面積の割合が小さくなってしまう。
【０００４】
本発明はこのような従来技術を背景に為されたものであって、インナーパネルが回り込み部を備える構造において有効発光面積を拡大できる車両用前照灯を提供することを目的とする。
【０００５】
【課題を解決するための手段】
請求項１記載の発明にあっては、ハウジングとアウターレンズとにより形成された灯室に、光源バルブと、該光源バルブの照射光を所定配光方向に反射するリフレクタと、前記リフレクタとハウジングとの間を隠すインナーパネルと、を備え、前記インナーパネルは前記リフレクタの前面周縁から車両側方または車両上方に回り込むように車両後方へ延在された回り込み部を有する構造の車両用前照灯において、少なくとも前記インナーパネルの回り込み部を導光部材で構成し、前記リフレクタに、前記光源バルブの照射光を前記インナーパネルの回り込み部の前端部に向けて反射して導光させる導光用反射部を設けることで、前記回り込み部を発光可能とし、前記インナーパネルの回り込み部の前端部に、該回り込み部の前端部に導光された光を該回り込み部の後部側に向けて反射させる反射層を設け、前記回り込み部の前端部の裏面側に、該回り込み部の後部側に向けて指向する補助光源を設けたことを特徴とするものである。
【０００７】
請求項２記載の発明にあっては、請求項１記載の車両用前照灯であって、前記補助光源を前記反射層の車両後方側に配置したことを特徴とする。
【０００８】
請求項３記載の発明にあっては、請求項１または２記載の車両用前照灯において、前記導光用反射部を前記リフレクタの反射面の基本配光面内に部分的に設けたことを特徴とするものである。
【０００９】
請求項４記載の発明にあっては、請求項１または２記載の車両用前照灯において、前記光源バルブの照射光の一部を遮断して前記リフレクタの反射面に非照射範囲を形成するシェードを備える構造であって、前記非照射範囲内に前記導光用反射部を設け、前記シェードに前記光源バルブの照射光を前記導光用反射部のみへ透過させるスリットを設けたことを特徴とするものである。
【００１０】
請求項５記載の発明にあっては、請求項１〜４のいずれか１項記載の車両用前照灯において、前記インナーパネルの回り込み部に裏面反射層を設けたことを特徴とするものである。
【００１１】
なお、本明細書中において回り込み部の前端部とは、回り込み部の前端から中間部までの回り込み部の前端近傍部分を意味する。
【００１２】
【発明の効果】
請求項１記載の発明によれば、導光部材で構成されるインナーパネルの回り込み部に導光用反射部を介して積極的に導光して、該回り込み部を発光させることができる。つまり、構造上、光源バルブの直接が届かずに影となってしまうインナーパネルの回り込み部が発光面となり、有効発光面積が拡大する。
【００１３】
また、回り込み部の前端部の反射層の存在により、回り込み部に前端部に導光された光が該前端部からそのまま漏洩して回り込み部の前端部と後部での明暗ができてしまうようなことを防止でき、回り込み部でのより均一な発光を実現できる。また、必要に応じて補助光源によってインナーパネルの回り込み部の輝度を調整できる。このとき、補助光源が回り込み部の前端部に配設されているので、補助光源の照射光を反射層を介して回り込み部の後部側に向かう光と略同一方向へ照射でき、回り込み部の形状設計が容易となる。しかも、補助光源は回り込み部の裏面側に設けられているため外部から視認しにくく、灯具の見栄えが向上する。
【００１４】
請求項２記載の発明によれば、請求項１記載の発明の効果に加え、補助光源を反射層の車両後方側に配置したため、補助光源が確実に反射層の後ろに隠れる。
【００１５】
請求項３記載の発明によれば、リフレクタの基本配光面内に部分的に導光用反射部を設けたため、フード部を備えずリフレクタの反射面全面を利用して配光するような場合であっても、請求項１または２の発明を具現化することができる。
【００１６】
請求項４記載の発明によれば、前記光源バルブの照射光の一部を遮断して前記リフレクタの反射面内に非照射範囲を形成するシェードを設けた構造、例えば、ロービーム用にリフレクタの反射面内に非照射範囲を形成しなくてはならない構造であっても、非照射範囲内の導光用反射部およびシェードのスリットによって請求項１〜３記載の発明を具現化することができる。このとき、非照射範囲を利用して回り込み部に導光するため、従来不使用であった光を有効に利用回収でき、同一光源で高輝度を達成できる。
【００１７】
請求項５記載の発明によれば、請求項１〜４のいずれか１項記載の発明の効果に加え、消灯時には裏面反射層がダミー反射面として回り込み部の裏側を透視不可能とする一方、点灯時には裏面反射層が回り込み部に導光された光を裏側に漏洩するを防止する。そのため、消灯時には回り込み部の見栄えが向上するとともに、点灯時には回り込み部の輝度がさらに高まる。
【００１８】
なお、消灯時に回り込み部の裏側を視認不可能とするためには、この請求項６記載の発明の他に、▲１▼アウターレンズの裏面にインナーパネルからの光を拡散する拡散手段を設ける、▲２▼アウターレンズとインナーパネルとの間にインナーパネルからの光を拡散する拡散手段を有するインナーレンズを設ける、▲３▼インナーパネルの表面に所定方向に偏向配光するプリズムシートを貼る、▲４▼インナーパネルを不透明な導光部材として構成する、などの例がありデザインなどの要求に合わせて適宜選択可能であるが、特に、請求項６記載の発明にあっては、裏面反射層がダミー反射面として機能することで、奥行感、透明感を備える商品価値の高い灯具を提供できる。
【００１９】
【発明の実施の形態】
以下、本発明の実施形態を図面をもとに説明する。
【００２０】
第１実施形態：図１〜図３は本発明の車両用前照灯の第１実施形態を示すものである。この車両用前照灯１０は、車体前端部に取り付けられる図示せぬハウジングと、該ハウジングに組み合わされて該ハウジングとの間に灯室１１を形成するアウターレンズ１２と、灯室１１内に配される光源バルブ１３およびリフレクタ１４およびインナーパネル１５を備えて構成されている。
【００２１】
アウターレンズ１２は、素通しレンズで構成され、配光機能はリフレクタ１４に付与されている。なお、リフレクタ１４に配光機能が付与されない場合にはアウターレンズ１２の裏面にレンズカット部を設けて配光してもよい。
【００２２】
リフレクタ１４は、図示せぬ玉継手および上下エイミング手段および左右エイミング手段からなるエイミング機構を介してハウジングに支持されており、これにより車体組付時にはリフレクタ１４の光軸を調節できるようになっている。
【００２３】
このリフレクタ１４の反射面１８は、回転楕円面または自由曲面などで形成され光源バルブ１３からの照射光を所定配光方向（この例ではハイビーム配光方向）に向けて反射する基本配光面１８ａと、フード部１６の内面の補助反射面１８ｂと、を備えて構成されている。
【００２４】
インナーパネル１５は、リフレクタ１４とハウジングとの隙間を隠す基本機能を有するものであり、車両後方に向けて上傾斜した灯室形状に合わせて、リフレクタ１４の前面下縁から車両前方に延在する前方突出部２１と、リフレクタ１４の前面上縁から車両上方側に回り込んで車両後方に延在する回り込み部２２と、を備えている。
【００２５】
そして、この実施形態のインナーパネル１５は、上記基本機能に加えて回り込み部２２を発光させるべく透明なアクリル樹脂などの導光部材として構成されていて、少なくともリフレクタ１４の反射面１８に臨んで位置することとなる回り込み部２２の前端部２２ａから導光して、該回り込み部２２が発光するようになっている。なお、インナーパネル１５には、アルミ蒸着または銀色塗装などによる裏面反射層２３が設けられ、この裏面反射層２３がダミー反射面としてインナーパネル１５の裏側を隠している。
【００２６】
リフレクタ１４の下フード部１６ｂは、回り込み部２２の前端部２２ａから積極的に導光するために、光源バルブ１３の照射光を回り込み部２２の前端部２２ａに向けて反射すべく角度設定されてその内面全体が導光用反射部２４となっている。
【００２７】
回り込み部２２の前端部２２ａには、該導光用反射部２４からの反射光をより導光しやすくすべく前記導光用反射部２４からの反射光の入射角がより直角に近づくように面設定された導光面２５が設けられている。また、同じく回り込み部２２の前端部２２ａには、導光面２５から回り込み部２２前端部２２ａに導光された光を漏洩させることなく効率的に回り込み部２２後部２２ｂ側に向けて変向させるべく前端反射層２６が設けられている。
【００２８】
そして、前端反射層２６で反射された光は、回り込み部２２の前端部２２ａから後部２２ｂに向けて導かれ、回り込み部２２の表面に形成された複数のレンズカット面２７、２７、２７・・で車両前方の所定配光方向に向けて反射するようになっている。
【００２９】
また、回り込み部２２の前端部２２ａには、光路を遮らない位置に、回り込み部２２の後部２２側に指向する補助光源としてのＬＥＤ２８が複数配設されていて、このＬＥＤ２８が回り込み部２２の発光量を補完している。ここで、このＬＥＤ２８は、回り込み部２２の裏面側に位置することで外部から視認しにくくなっていて、しかも、前端反射層２６の後方に位置することで前端反射層２６の後ろに隠れるようになっている。
【００３０】
以下、このように構成された第１実施形態の車両用前照灯１０の作用を光路に沿って説明する。
【００３１】
光源バルブ１３の照射光の大部分は、リフレクタ１４の反射面１８の基本配光面１８ａで反射されて車両前方の所定配光方向に向かい、光源バルブ１３の照射光の一部は、直接または導光用反射部２４で反射され、導光面２５から回り込み部２２の前端部２２ａに導光される。
【００３２】
導光面２５から導光された光は、前端反射層２６で反射された後、ＬＥＤ２８の照射光と共に回り込み部２２の前端２２ａから後部２２ｂに向けて導びかれ、さらにレンズカット面２７、２７、２７・・・で反射されて車両前方の所定配光方向に向かう。
【００３３】
以上のようにこの第１実施形態の車両用前照灯１０によれば、インナーパネル１５が回り込み部２２を有する構造において、前記インナーパネル１５を導光部材で構成し、光源バルブ１３の照射光を回り込み部２２の前端部２２ａに向けて反射して導光させる導光用反射部２４を設けたため、回り込み部２２に光源バルブ１３の照射光を積極的に導光して該回り込み部２２を発光させることができる。つまり、構造上、光源バルブ１３からの直接光が届かずに影となってしまう回り込み部２２が発光面となり、図１に示すように、灯具全体に対する有効発光面積を拡大することができる。これに伴い、対向車および歩行車からの視認性に優れた灯具となる。
【００３４】
また、この実施形態では、リフレクタ１４のフード部１６ｂを利用して導光用反射部２４を形成したため、従来は利用していなかった光を有効に回収利用できる。そのため、同一光源を用いても灯具として高輝度化することができる。
【００３５】
また、この第１実施形態の車両用前照灯１０によれば、回り込み部２２の前端部２２ａの前端反射層２６が、前端部２２ａから光がそのまま漏洩して前端部２２ａと後部２２ｂと間に明暗ができてしまうようなことを防止するため、回り込み部２２での均一な発光を実現できる。
【００３６】
また、この第１実施形態の車両用前照灯１０によれば、回り込み部２２の前端部２２ａに補助光源としてのＬＥＤ２８を設けたことで、回り込み部２２の輝度を調整できる。このとき、ＬＥＤ２８が回り込み部２２の前端部２２ａに配設されることで、ＬＥＤ２８の照射光を前端反射層２６から回り込み部２２後部２２ｂに向かう反射光と略同一方向に設定できるため、回り込み部２２のレンズカット面２７、２７、２７、・・・の形状設計が容易となる。そして、そのような構造でありながらも、ＬＥＤ２８は回り込み部２２の裏面側に位置するので外部から視認しにくく、灯具の見栄えを損なわない。
【００３７】
しかも、この第１実施形態の車両用前照灯１０によれば、ＬＥＤ２８が前端反射層２６の後方に位置するため、車両前方からある程度距離をおいて灯具を見た場合にはＬＥＤ２８は完全に前端反射層２６に隠れ、灯具の見栄え向上につながる。
【００３８】
また、この第１実施形態の車両用前照灯１０によれば、裏面反射層２３が、消灯時にはダミー反射面として回り込み部２２裏側を透視不可能とする一方、点灯時には回り込み部２２裏側への光の漏洩を防止する。そのため、消灯時には回り込み部２２の見栄えが向上し、点灯時には回り込み部２２の輝度が向上する。
【００３９】
なお、インナーパネル１５の回り込み部２２からの発光をより均一にしたい場合には、アウターレンズ１２の裏面の回り込み部２２に対応する位置に回り込み部２２からの照射を拡散する拡散部を設けたり、または、アウターレンズ１２と回り込み部２２との間に、回り込み部２２からの照射を拡散する拡散部を有するインナーレンズを設けてもよいものとする。
【００４０】
第２実施形態：図４および図５は第２実施形態を示すものである。なお、第１実施形態と同様の構成については同一の符号を付し、構成・作用効果の説明を省略する。
【００４１】
第２実施形態の車両用前照灯３０は、リフレクタ１４の反射面１８の基本配光面１８ａ内に部分的に複数の導光用反射部３１、３１を設けた点で第１実施形態と異なっている。この導光用反射部３１は、図５に示すように基本配光面１８ａに設けられた凹部３２の底面として形成されていて、該凹部３２の側面３３はグレア光を生成しないように光源バルブ１３の直射光に対して影となるように反り傾斜している。
【００４２】
このような第２実施形態の車両用前照灯３０によれば、リフレクタ１４の反射面１８全面を利用して配光するような場合、つまり、ハイビーム配光のような場合であっても、第１実施形態と同様の効果を得ることができる。
【００４３】
また、この第２実施形態の車両用前照灯３０によれば、リフレクタ１４の外縁形状を変更することなく導光用反射部３１を形成できるため、リフレクタ１４外縁形状および該リフレクタ１４外縁形状に合わせて設計されるインナーパネル１５の外縁形状を変更する必要がなく、既存のデザインの車両用前照灯をそのまま流用して本発明の車両用前照灯に比較的低コストで変更できる。
【００４４】
第３実施形態：図６〜図７は第３実施形態を示すものである。なお、第１，第２実施形態と同様の構成については同一符号を付し説明を省略する。この第３実施形態の車両用前照灯４０は、ロービーム用に、光源バルブ１３からの下方照射を遮断してリフレクタ１４の反射面１８の下部を非照射範囲とする下方照射遮断部４２を有するシェード４１を備えた例である。
【００４５】
この実施形態では、リフレクタ１４の非照射範囲に導光用反射部４４、４４が設けられており、シェード４１の下方照射遮断部４２に光源バルブ１３の照射光を各導光用反射部４４、４４にのみに透過させるスリット４３、４３が設けられている。また、この実施形態では、反射面１８と導光用反射部４４との面形状差をによる見栄え低下を防ぐべくこれら反射面１８と導光用反射部４４とを滑らかに繋ぐ除変部４５が設けられている。
【００４６】
この第３実施形態によれば、シェード４１でリフレクタ１４の反射面１８下部への照射を遮るロービーム用の構造であっても、非照射範囲の導光用反射部４４、４４およびシェード４１のスリット４３、４３によって第１，２実施形態と同様の効果を得られる。このとき、非照射範囲を利用するため、従来不使用であった光を有効に利用回収でき、同一光源で高輝度を達成できる。
【００４７】
また、この第３実施形態によれば、スリット４３によって導光用反射部４４の近傍には照射光が及ばないため、グレア光を発生させることなく反射面１８と導光用反射部４４とを滑らかに繋ぐ除変部４５を設けることができ、見栄えをさらに向上させることができる。
【００４８】
なお、シェードのスリットは、この実施形態のように光源バルブ４３と別体でシェード４１が設けられた例に限られず、Ｈ４バルブなどのように光源バルブ自体にシェードが設けらたものであっても適用できる。
【図面の簡単な説明】
【図１】本発明の第１実施形態の車両用前照灯の概略縦断面図。
【図２】同車両用前照灯のインナーパネルの概略形状を示す斜視図。
【図３】同車両用前照灯の要部を示す拡大断面図。
【図４】本発明の第２実施形態の車両用前照灯の要部斜視図。
【図５】図４中Ａ−Ａ線に沿う断面図。
【図６】本発明の第３実施形態の車両用前照灯の要部断面図。
【図７】同車両用前照灯に用いるシェードの下面図。
【符号の説明】
１０車両用前照灯
１１灯室
１２アウターレンズ
１３光源バルブ
１４リフレクタ
１５インナーパネル
１８反射面
１８ａ基本配光面
２２回り込み部
２２ａ回り込み部の前端部
２２ｂ回り込み部の後部
２３裏面反射層
２４導光用反射部
２６前端反射層（反射層）
２８ＬＥＤ（補助光源）
３０車両用前照灯
３１導光用反射部
４０車両用前照灯
４１シェード
４３スリット
４４導光用反射部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle headlamp.
[0002]
[Prior art]
In a conventional vehicle headlamp, a housing, an outer lens that is assembled to the housing and forms a lamp chamber, and light emitted from a light source bulb provided in the lamp chamber is distributed in a predetermined light distribution direction. There is a configuration including a reflector that reflects light and an inner panel that conceals a gap between the housing and the reflector.
[0003]
[Problems to be solved by the invention]
In recent years, this type of vehicle headlamp tends to increase the amount of wraparound from the front end of the vehicle to the side of the vehicle or above the vehicle, and accordingly, the amount of wraparound of the inner panel also tends to increase. Since the wraparound portion of the inner panel is in a range where direct light from the light source bulb does not reach, the ratio of the wraparound portion that does not emit light with respect to the reflector that is the light emitting surface in the conventional vehicle headlamp The ratio of the effective light emitting area becomes small when the lamp is increased as a whole.
[0004]
The present invention has been made against the background of such a conventional technique, and an object of the present invention is to provide a vehicular headlamp capable of expanding an effective light emitting area in a structure in which an inner panel includes a wraparound portion.
[0005]
[Means for Solving the Problems]
In the first aspect of the invention, a lamp chamber formed by the housing and the outer lens has a light source bulb, a reflector for reflecting light emitted from the light source bulb in a predetermined light distribution direction, the reflector and the housing, In the vehicle headlamp having a structure having a wraparound portion extending to the vehicle rear side so as to wrap around from the front peripheral edge of the reflector to the side of the vehicle or above the vehicle And a light guide reflecting portion configured to reflect and guide the light emitted from the light source bulb toward a front end portion of the wraparound portion of the inner panel at least in the wraparound portion of the inner panel by a light guide member. by providing, and capable of emitting the curved portion, the front end portion of the curved portion of the inner panel, is guided to the front end of the curved portion A reflective layer for reflecting the rear side of the curved portion of the light is provided, on the back side of the front end portion of the curved portion, characterized in that an auxiliary light source directed toward the rear side of the curved portion Is.
[0007]
The invention according to claim 2 is the vehicle headlamp according to claim 1, characterized in that the auxiliary light source is arranged on the vehicle rear side of the reflective layer.
[0008]
According to a third aspect of the present invention, in the vehicle headlamp according to the first or second aspect, the light guide reflecting portion is partially provided within a basic light distribution surface of the reflecting surface of the reflector. It is characterized by.
[0009]
According to a fourth aspect of the present invention, in the vehicle headlamp according to the first or second aspect, a part of the irradiation light of the light source bulb is blocked to form a non-irradiation range on the reflecting surface of the reflector. A structure having a shade, wherein the light guide reflection portion is provided in the non-irradiation range, and a slit is provided in the shade to transmit the light emitted from the light source bulb only to the light guide reflection portion. It is what.
[0010]
The invention according to claim 5 is characterized in that, in the vehicle headlamp according to any one of claims 1 to 4 , a back surface reflection layer is provided in a wraparound portion of the inner panel. is there.
[0011]
In the present specification, the front end portion of the wraparound portion means a portion near the front end of the wraparound portion from the front end of the wraparound portion to the intermediate portion.
[0012]
【The invention's effect】
According to the first aspect of the present invention, light can be actively guided to the wraparound portion of the inner panel formed of the light guide member via the light guide reflection portion, and the wraparound portion can be caused to emit light. That is, due to the structure, the wraparound portion of the inner panel that becomes a shadow without directly reaching the light source bulb becomes the light emitting surface, and the effective light emitting area is expanded.
[0013]
In addition, due to the presence of the reflective layer at the front end of the wraparound part, the light guided to the front end part leaks as it is from the front end part, and the front end part and the rear part of the wraparound part can be made bright and dark. Can be prevented, and more uniform light emission at the wraparound portion can be realized. Moreover, the brightness | luminance of the wraparound part of an inner panel can be adjusted with an auxiliary light source as needed. At this time, since the auxiliary light source is disposed at the front end portion of the wraparound portion, the irradiation light of the auxiliary light source can be irradiated in substantially the same direction as the light directed to the rear side of the wraparound portion via the reflective layer, and the shape of the wraparound portion Design becomes easy. Moreover, since the auxiliary light source is provided on the back side of the wraparound portion, it is difficult to visually recognize from the outside, and the appearance of the lamp is improved.
[0014]
According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, since the auxiliary light source is arranged on the vehicle rear side of the reflective layer, the auxiliary light source is surely hidden behind the reflective layer.
[0015]
According to the third aspect of the present invention, since the light guide reflecting portion is partially provided in the basic light distribution surface of the reflector, the hood portion is not provided and light is distributed using the entire reflecting surface of the reflector. Even so, the invention of claim 1 or 2 can be embodied.
[0016]
According to a fourth aspect of the present invention, there is provided a structure in which a shade that blocks a part of the irradiation light of the light source bulb and forms a non-irradiation range in the reflection surface of the reflector, for example, the reflection of the reflector for a low beam. Even if it is a structure which must form a non-irradiation range in a surface, invention of Claims 1-3 can be embodied by the reflection part for light guides in the non-irradiation range, and the slit of a shade. At this time, since the light is guided to the wraparound portion using the non-irradiation range, it is possible to effectively use and collect light that has not been used conventionally, and achieve high luminance with the same light source.
[0017]
According to the invention of claim 5 , in addition to the effect of the invention of any one of claims 1 to 4 , when turning off the light, the back surface reflection layer serves as a dummy reflection surface and the back side of the wraparound portion cannot be seen through, At the time of lighting, the back surface reflection layer prevents light guided to the wraparound portion from leaking to the back side. Therefore, the appearance of the wraparound portion is improved when the light is turned off, and the brightness of the wraparound portion is further increased when the light is turned on.
[0018]
In addition, in order to make the back side of the wraparound portion invisible when turned off, in addition to the invention of claim 6, a diffusion means for diffusing light from the inner panel is provided on the back surface of the outer lens. (2) An inner lens having diffusion means for diffusing light from the inner panel is provided between the outer lens and the inner panel. (3) A prism sheet that deflects light in a predetermined direction is pasted on the surface of the inner panel. 4 ▼ There is an example of configuring the inner panel as an opaque light guide member, etc., which can be appropriately selected according to the requirements of the design, etc. In particular, in the invention of claim 6, the back reflective layer is By functioning as a dummy reflecting surface, it is possible to provide a lamp with high commercial value that has a sense of depth and transparency.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0020]
First Embodiment: FIGS. 1 to 3 show a first embodiment of a vehicle headlamp according to the present invention. The vehicle headlamp 10 includes a housing (not shown) attached to the front end of the vehicle body, an outer lens 12 which is combined with the housing and forms a lamp chamber 11 between the housing, and a lamp chamber 11. The light source bulb 13, the reflector 14, and the inner panel 15 are configured.
[0021]
The outer lens 12 is constituted by a through lens, and the light distribution function is given to the reflector 14. If the light distribution function is not given to the reflector 14, a light may be distributed by providing a lens cut portion on the back surface of the outer lens 12.
[0022]
The reflector 14 is supported by the housing through an aiming mechanism including a ball joint, a vertical aiming means, and a left and right aiming means (not shown), so that the optical axis of the reflector 14 can be adjusted when the vehicle body is assembled. .
[0023]
The reflecting surface 18 of the reflector 14 is formed of a spheroidal surface, a free-form surface, or the like, and a basic light distribution surface 18a that reflects irradiation light from the light source bulb 13 toward a predetermined light distribution direction (in this example, a high beam distribution direction). And an auxiliary reflection surface 18b on the inner surface of the hood portion 16.
[0024]
The inner panel 15 has a basic function of concealing the gap between the reflector 14 and the housing, and extends from the lower front edge of the reflector 14 to the front of the vehicle in accordance with the shape of the lamp room that is inclined upward toward the rear of the vehicle. A front projecting portion 21 and a wraparound portion 22 that extends from the upper front edge of the reflector 14 toward the vehicle upper side and extends rearward of the vehicle are provided.
[0025]
The inner panel 15 of this embodiment is configured as a light guide member such as a transparent acrylic resin so as to cause the wraparound portion 22 to emit light in addition to the above basic function, and is positioned so as to face at least the reflecting surface 18 of the reflector 14. The light is guided from the front end portion 22a of the wraparound portion 22, and the wraparound portion 22 emits light. The inner panel 15 is provided with a back surface reflection layer 23 made of aluminum vapor deposition or silver paint, and the back surface reflection layer 23 hides the back side of the inner panel 15 as a dummy reflection surface.
[0026]
The lower hood portion 16 b of the reflector 14 is angled so as to reflect the irradiation light of the light source bulb 13 toward the front end portion 22 a of the wraparound portion 22 in order to actively guide the light from the front end portion 22 a of the wraparound portion 22. The entire inner surface is a light guide reflecting portion 24.
[0027]
At the front end portion 22a of the wraparound portion 22, the incident angle of the reflected light from the light guide reflection portion 24 approaches a right angle so that the reflected light from the light guide reflection portion 24 can be more easily guided. A light guide surface 25 having a set surface is provided. Similarly, the light guided from the light guide surface 25 to the front end portion 22a of the wraparound portion 22 is efficiently turned toward the front portion 22a of the wraparound portion 22 toward the rear portion 22b of the wraparound portion 22 without leaking. Accordingly, a front end reflective layer 26 is provided.
[0028]
The light reflected by the front end reflection layer 26 is guided from the front end portion 22a of the wraparound portion 22 toward the rear portion 22b, and a plurality of lens cut surfaces 27, 27, 27,. Thus, the light is reflected toward a predetermined light distribution direction in front of the vehicle.
[0029]
The front end portion 22a of the wraparound portion 22 is provided with a plurality of LEDs 28 as auxiliary light sources directed to the rear portion 22 side of the wraparound portion 22 at positions that do not block the optical path. Complements the amount. Here, the LED 28 is difficult to see from the outside by being positioned on the back surface side of the wraparound portion 22, and is hidden behind the front end reflective layer 26 by being positioned behind the front end reflective layer 26. It has become.
[0030]
Hereinafter, the operation of the vehicle headlamp 10 of the first embodiment configured as described above will be described along the optical path.
[0031]
Most of the light emitted from the light source bulb 13 is reflected by the basic light distribution surface 18a of the reflecting surface 18 of the reflector 14 and travels in a predetermined light distribution direction in front of the vehicle, and a part of the light emitted from the light source bulb 13 is directly or The light is reflected by the light guide reflection portion 24 and guided from the light guide surface 25 to the front end portion 22 a of the wraparound portion 22.
[0032]
The light guided from the light guide surface 25 is reflected by the front end reflection layer 26, and then guided from the front end 22 a of the wraparound portion 22 toward the rear portion 22 b together with the irradiation light of the LED 28, and further, the lens cut surfaces 27, 27. , 27... And reflected in a predetermined light distribution direction in front of the vehicle.
[0033]
As described above, according to the vehicle headlamp 10 of the first embodiment, the inner panel 15 includes the light guide member in the structure in which the inner panel 15 includes the wraparound portion 22, and the light emitted from the light source bulb 13 is obtained. Since the light guide reflection portion 24 that reflects and guides light toward the front end portion 22a of the wraparound portion 22 is provided, the irradiation light from the light source bulb 13 is actively guided to the wraparound portion 22 so that the wraparound portion 22 is guided. Can emit light. That is, due to the structure, the sneak portion 22 that does not receive direct light from the light source bulb 13 and becomes a shadow becomes a light emitting surface, and as shown in FIG. 1, the effective light emitting area for the entire lamp can be expanded. As a result, the lamp is excellent in visibility from oncoming vehicles and walking vehicles.
[0034]
In this embodiment, since the light guide reflection portion 24 is formed using the hood portion 16b of the reflector 14, light that has not been conventionally used can be effectively collected and used. For this reason, even if the same light source is used, the brightness of the lamp can be increased.
[0035]
Further, according to the vehicle headlamp 10 of the first embodiment, the front end reflection layer 26 of the front end portion 22a of the wraparound portion 22 leaks light from the front end portion 22a as it is, and the gap between the front end portion 22a and the rear portion 22b. Therefore, uniform light emission at the wraparound portion 22 can be realized.
[0036]
According to the vehicle headlamp 10 of the first embodiment, the luminance of the sneak portion 22 can be adjusted by providing the LED 28 as an auxiliary light source at the front end 22 a of the sneak portion 22. At this time, since the LED 28 is disposed at the front end portion 22a of the wraparound portion 22, the irradiation light of the LED 28 can be set in substantially the same direction as the reflected light from the front end reflection layer 26 toward the wraparound portion 22 rear portion 22b. The shape design of the 22 lens cut surfaces 27, 27, 27,. And although it is such a structure, since LED28 is located in the back surface side of the wraparound part 22, it is hard to visually recognize from the outside and does not impair the appearance of a lamp.
[0037]
Moreover, according to the vehicle headlamp 10 of the first embodiment, since the LED 28 is located behind the front end reflection layer 26, the LED 28 is completely displayed when the lamp is viewed at a certain distance from the front of the vehicle. It hides in the front end reflection layer 26 and leads to an improvement in the appearance of the lamp.
[0038]
Further, according to the vehicle headlamp 10 of the first embodiment, the back surface reflection layer 23 cannot be seen through the back side of the wraparound portion 22 as a dummy reflection surface when the light is extinguished. Prevent light leakage. Therefore, the appearance of the wraparound portion 22 is improved when the light is turned off, and the luminance of the wraparound portion 22 is improved when the light is turned on.
[0039]
In addition, in order to make the light emission from the wraparound portion 22 of the inner panel 15 more uniform, a diffusion portion that diffuses irradiation from the wraparound portion 22 is provided at a position corresponding to the wraparound portion 22 on the back surface of the outer lens 12, Alternatively, an inner lens having a diffusion part that diffuses irradiation from the wraparound part 22 may be provided between the outer lens 12 and the wraparound part 22.
[0040]
Second Embodiment: FIGS. 4 and 5 show a second embodiment. In addition, about the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and description of a structure and an effect is abbreviate | omitted.
[0041]
The vehicle headlamp 30 according to the second embodiment is different from that according to the first embodiment in that a plurality of light guide reflection portions 31 and 31 are partially provided in the basic light distribution surface 18 a of the reflection surface 18 of the reflector 14. Is different. As shown in FIG. 5, the light guide reflecting portion 31 is formed as a bottom surface of a concave portion 32 provided on the basic light distribution surface 18a, and the side surface 33 of the concave portion 32 does not generate glare light. 13 is warped and inclined so as to be a shadow with respect to direct light.
[0042]
According to the vehicle headlamp 30 of the second embodiment, even when light distribution is performed using the entire reflecting surface 18 of the reflector 14, that is, in the case of high beam light distribution, The same effect as in the first embodiment can be obtained.
[0043]
Further, according to the vehicle headlamp 30 of the second embodiment, since the light guide reflecting portion 31 can be formed without changing the outer edge shape of the reflector 14, the reflector 14 outer edge shape and the reflector 14 outer edge shape can be formed. It is not necessary to change the outer edge shape of the inner panel 15 designed together, and the vehicle headlamp having the existing design can be used as it is and can be changed to the vehicle headlamp of the present invention at a relatively low cost.
[0044]
Third Embodiment: FIGS. 6 to 7 show a third embodiment. In addition, about the structure similar to 1st, 2nd embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted. The vehicle headlamp 40 according to the third embodiment has a lower irradiation blocking portion 42 for blocking the lower irradiation from the light source bulb 13 and setting the lower portion of the reflecting surface 18 of the reflector 14 as a non-irradiation range for the low beam. This is an example including a shade 41.
[0045]
In this embodiment, the light guide reflection portions 44 and 44 are provided in the non-irradiation range of the reflector 14, and the light emitted from the light source bulb 13 is transmitted to the lower irradiation blocking portion 42 of the shade 41. Slits 43, 43 that allow only 44 to pass through are provided. Further, in this embodiment, the change-over unit 45 that smoothly connects the reflection surface 18 and the light guide reflection unit 44 to prevent appearance deterioration due to the difference in surface shape between the reflection surface 18 and the light guide reflection unit 44 is provided. Is provided.
[0046]
According to the third embodiment, the light guide reflectors 44 and 44 in the non-irradiation range and the slits of the shade 41 are used even in the low beam structure in which the shade 41 blocks the irradiation to the lower part of the reflecting surface 18 of the reflector 14. The same effects as in the first and second embodiments can be obtained by 43 and 43. At this time, since the non-irradiation range is used, light that has not been used conventionally can be used and collected effectively, and high luminance can be achieved with the same light source.
[0047]
Further, according to the third embodiment, since the irradiation light does not reach the vicinity of the light guide reflection portion 44 by the slit 43, the reflection surface 18 and the light guide reflection portion 44 are formed without generating glare light. It is possible to provide the removal / change portion 45 that smoothly connects, and the appearance can be further improved.
[0048]
The shade slit is not limited to the example in which the shade 41 is provided separately from the light source bulb 43 as in this embodiment, and the shade is provided in the light source bulb itself, such as an H4 bulb. Is also applicable.
[Brief description of the drawings]
FIG. 1 is a schematic longitudinal sectional view of a vehicle headlamp according to a first embodiment of the present invention.
FIG. 2 is a perspective view showing a schematic shape of an inner panel of the vehicle headlamp.
FIG. 3 is an enlarged cross-sectional view showing a main part of the vehicle headlamp.
FIG. 4 is a perspective view of a main part of a vehicle headlamp according to a second embodiment of the present invention.
FIG. 5 is a cross-sectional view taken along line AA in FIG.
FIG. 6 is a cross-sectional view of a main part of a vehicle headlamp according to a third embodiment of the present invention.
FIG. 7 is a bottom view of a shade used for the vehicle headlamp.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Vehicle headlamp 11 Lamp chamber 12 Outer lens 13 Light source bulb 14 Reflector 15 Inner panel 18 Reflecting surface 18a Basic light distribution surface 22 Rounding part 22a Rounding part front end part 22b Rounding part rear part 23 Back surface reflecting layer 24 Light guide Reflector 26 Front end reflective layer (reflective layer)
28 LED (auxiliary light source)
DESCRIPTION OF SYMBOLS 30 Vehicle headlamp 31 Light guide reflection part 40 Vehicle headlamp 41 Shade 43 Slit 44 Light guide reflection part

Claims

A lamp chamber formed by a housing and an outer lens includes a light source bulb, a reflector that reflects light emitted from the light source bulb in a predetermined light distribution direction, and an inner panel that hides between the reflector and the housing. In the vehicle headlamp having a structure in which the panel has a wraparound portion extending from the front peripheral edge of the reflector to the vehicle side or the vehicle rear so as to wrap around the vehicle,
At least a wraparound portion of the inner panel is formed of a light guide member, and a light guide reflection portion that guides light reflected from the light source bulb toward the front end of the wraparound portion of the inner panel is formed on the reflector. By providing, the wraparound portion can emit light ,
Provided at the front end portion of the wraparound portion of the inner panel is a reflective layer that reflects light guided to the front end portion of the wraparound portion toward the rear side of the wraparound portion ,
A vehicular headlamp characterized in that an auxiliary light source directed toward the rear side of the wraparound portion is provided on the back side of the front end portion of the wraparound portion .

The vehicle headlamp according to claim 1,
A vehicular headlamp characterized in that the auxiliary light source is disposed on the vehicle rear side of the reflective layer.

The vehicle headlamp according to claim 1 or 2 ,
A vehicular headlamp characterized in that the light guide reflecting portion is partially provided in a basic light distribution surface of a reflecting surface of the reflector.

The vehicle headlamp according to claim 1 or 2 ,
A structure including a shade that blocks a part of the irradiation light of the light source bulb to form a non-irradiation range on a reflection surface of the reflector,
The vehicular headlamp characterized in that the light guide reflecting portion is provided in the non-irradiation range, and a slit is provided in the shade to transmit the light emitted from the light source bulb only to the light guide reflecting portion.

The vehicle headlamp according to any one of claims 1 to 4 ,
A vehicular headlamp characterized in that a back surface reflection layer is provided in a wraparound portion of the inner panel.