JP4565603B2 - Vehicle headlamp - Google Patents

Vehicle headlamp Download PDF

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Publication number
JP4565603B2
JP4565603B2 JP2001272464A JP2001272464A JP4565603B2 JP 4565603 B2 JP4565603 B2 JP 4565603B2 JP 2001272464 A JP2001272464 A JP 2001272464A JP 2001272464 A JP2001272464 A JP 2001272464A JP 4565603 B2 JP4565603 B2 JP 4565603B2
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Prior art keywords
light
reflecting surface
vehicle headlamp
elliptical reflecting
focal point
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JP2003086009A (en
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均 谷内
輝夫 小池
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Stanley Electric Co Ltd
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Stanley Electric Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/322—Optical layout thereof the reflector using total internal reflection
    • 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
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/24—Light guides

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、ヘッドランプ、フォグランプなど車両用前照灯の構成に関するものであり、詳細にはプロジェクタ型を基本構成とし、光源に対する光束利用率を向上させて、一層に明るい車両用前照灯の実現を可能とする構成の提供を目的とするものである。
【０００２】
【従来の技術】
従来のこの種の車両用前照灯９０の構成をプロジェクタ式の例で示すものが図６であり、この車両用前照灯９０は、光源９１と、この光源９１に第一焦点を一致させる楕円反射面９２と、前記楕円反射面９２の第二焦点ｆ２の近傍に設置されるシャッタ９３と、投影レンズ９４とから構成されている。
【０００３】
上記のように構成された車両用前照灯９０においては、光源９１からの光の内の楕円反射面９２に反射した光は第二焦点ｆ２に収束するものとなり、その収束途上で略下半部がシャッタ９３により遮蔽され、投影レンズ９４で照射方向に投射が行われるときに上向き光となる成分が取り除かれる。よって、この車両用前照灯９０からの照射光には、基本的に上向き光を含むことのないすれ違い配光が得られるものとなる。
【０００４】
尚、図示は省略するが上記楕円反射面９２に換えて回転放物面など放物反射面を採用した構成の車両用前照灯も存在するが、光源９１に対する光束捕捉率は、一般的には楕円反射面９２を採用した車両用前照灯９０の方が高く、より明るい車両用前照灯の実現が可能であると言われている。
【０００５】
【発明が解決しようとする課題】
しかしながら、上記した従来の構成の車両用前照灯９０においては、前記楕円反射面９２の光源９１に対する光束捕捉率は６５％程度であり、また、前記シャッタ９３ではほぼ半分の光量が遮蔽されものであるので、投影レンズ９４には光源９１からの光の内の約３５％が達するに過ぎない。また、上記に加えて楕円反射面９２の反射効率（約８５％）、前記投影レンズ９４の透過効率（約７５％）なども影響するので、実際に照射光として使用されるのは、光源９１からの光の内の僅かに２３％程度に過ぎず、あまりに低効率に過ぎるという問題点を生じている。
【０００６】
【課題を解決するための手段】
本発明は上記した従来の課題を解決するための具体的手段として、光源と、この光源に第一焦点を有する楕円反射面と、前記楕円反射面の第二焦点の近傍に配置されるシャッタと、前記シャッタの近傍に焦点を有する投影レンズとから成るプロジェクタユニットを有する車両用前照灯であり、前記楕円反射面の照射方向前方であり、前記楕円反射面およびこの楕円反射面からの反射光が第二焦点に収束する光路、前記シャッタ、前記投影レンズとに干渉を生じない位置には、前記楕円反射面に補足されない前記光源からの直射光を受光し略平行光線に変換して内部に取り込む受光レンズ部と、前記受光レンズ部からの光をこの車両用前照灯の照射方向に向けて内面反射する内面反射部と、前記内面反射部からの反射光をこの車両用前照灯の照射方向に向かう光として外部に射出する出射面部とが一体の透明部材で形成された補助レンズユニットが前記プロジェクタユニットを取り囲むようにして設けられ、前記受光レンズ部は前記プロジェクタユニットの光軸に対し少なくとも一つの傾き角を有する略コーン状の平行光線を前記内面反射部に向かわせる略リング状であることを特徴とする車両用前照灯を提供することで課題を解決するものである。
【０００７】
【発明の実施の形態】
つぎに、本発明を図に示す実施形態に基づいて詳細に説明する。図１及び図２に符号１で示すものは本発明に係る車両用前照灯であり、この車両用前照灯１は、光源２と、この光源２に第一焦点を一致させている楕円反射面３と、前記楕円反射面３の第二焦点ｆ２の近傍に設けられるシャッタ４と、シャッタ４の近傍に焦点を有する投影レンズ５とからなるプロジェクタユニット６と、補助レンズユニット７とから構成されている。
【０００８】
尚、前記プロジェクタユニット６については、従来例で説明したのとほぼ同様な構成であるので、本発明における特有な構成の部分を除いては、その詳細な説明を省略する。本発明では前記プロジェクタユニット６の前記楕円反射面３は中心軸Ｘ方向への深さを浅く設定され、従来例のものが光源２からの光量を６５％程度捕捉するものとされていたのに対し、本発明では３０〜５０％程度捕捉するものとされている。
【０００９】
ここで、前記楕円反射面３からの反射光が第二焦点ｆ２に収束するときの状態を光源２の大きさを無視して考察すれば、その光束は第二焦点ｆ２を頂点とし、楕円反射面３の外径を底面とする円錐状である。このときに楕円反射面３の深さを浅くしていくと、前記した円錐状の頂角は狭くなる。
【００１０】
上記の円錐状の頂角が狭くなるということを、図２に示す状態で考察すれば、第二焦点ｆ２に収束するときの上向き光の角度が減じるということであり、即ち、車両用前照灯１としての照射光中から上向き光の成分が減ることとなる。よって、楕円反射面３の深さを減らしたことで、シャッタ４により遮蔽を行わざるを得ない上向き光の割合が減じ、楕円反射面３からの反射光に対し、照射光として利用できる割合が増えるものとなる。
【００１１】
ちなみに、従来のプロジェクタ型の楕円反射面では、上記にも説明したように光源からの光の６５％を捕捉するものとし、その約半分をシャッタにより遮蔽していたので、約３６％が照射光として利用されるものとなっていたが、本発明により楕円反射面３を浅く設定し捕捉率を５０％、或いは、それ以下（例えば３０％）と設定したことでシャッタ４による遮蔽率は約３０％に低減し、捕捉率が５０％の場合約３５％が、捕捉率が３０％の場合でも約２２％が照射光として利用されるものとなった。但し、上記の数値は、何れも楕円反射面３の反射効率（約８５％）、投影レンズ５の透過効率（約７５％）は除いてある。
【００１２】
即ち、本発明によれば楕円反射面３を浅く設定したにもかかわらず、プロジェクタユニット６の投影レンズ５から照射方向に投射される光量は従来のものからそれ程に低下していないものとなる。同時に前記楕円反射面３を浅く設定したことで、光源２からの光の楕円反射面３に捕捉されないものの割合が増えるので、本発明では、楕円反射面３に捕捉されない光を補助レンズユニット７で回収し照射光として使用するのである。
【００１３】
前記補助レンズユニット７は、前記楕円反射面３の照射方向前方に設けられるものであり、このときには、楕円反射面３からの反射光が第二焦点ｆ２に収束する光路と干渉することがなく、また、シャッタ４、投影レンズ５と位置的な干渉を生じないように設けられる。
【００１４】
そして、補助レンズユニット７には、光源２からの直射光を受光し、この補助レンズユニット７が形成された部材の内部で所定の方向へ向かう平行光線に変換する受光レンズ部７１と、前記受光レンズ部７１からの光の進行方向側に設けられ、この光の進路を車両用前照灯１の照射方向に変換する内面反射部７２と、前記内面反射部７２を灯具外部に射出する出射面部７３とが設けられている。
【００１５】
即ち、この補助レンズユニット７は、受光レンズ部７１から出射面部７３までが一体の透明部材で形成され、上記した平行光線の内面反射部７２での反射は補助レンズユニット７が形成された樹脂など高屈折部材（屈折率＝略１．５）と大気（屈折率＝１．０）との境界面で行われている。
【００１６】
ここで、前記補助レンズユニット７の全体形状について説明を行えば、光源２は基本的には全方位に光を発しているものであるので、図２に断面で示した形状を車両用前照灯１の中心軸Ｘを軸として回転させた形状が、光源２に対しての光束捕捉率を高く設定できるものとなる。よって、本発明でも前記の形状として補助レンズユニット７を形成している。
【００１７】
以上の説明のように本発明により、１つの光源２に対して楕円反射面３と補助レンズユニット７とを設けたことで、両者３、７に適宜な割合で光を配分する必要が生じる。ここで、発明者の検討の結果によると、プロジェクタユニット６と補助レンズユニット７とは、シャッタ４が設けられないこともあり補助レンズユニット７の方が光効率であることが確認された。
【００１８】
よって、本発明では、当初の目的であるできるだけ明るい車両用前照灯１の実現に沿うべく、光源２からの光の配布割合を、プロジェクタユニット６＝３０％、補助レンズユニット７＝６５％と設定した。尚、本発明は上記の配布割合を限定するものではなく、例えば、配光の形状を重視するなど車両用前照灯１に期待する目的により自由に設定することが可能である。
【００１９】
このようにしたことで、前記プロジェクタユニット６は光源２からの光の約１４％を照射光として投射するものとなり、補助レンズユニット７は光源２からの光の約４９％を照射光として投射するものとなり、合計では６３％の光が照射光として利用されるものとなった。これを、従来例の車両用前照灯の効率２３％と比較すれば、本願発明の車両用前照灯は２．５倍以上明るいものとなり、視認性の向上に顕著な効果を奏するものである。
【００２０】
図３は本発明に係る車両用前照灯１における配光特性（すれ違い配光）Ｄの例を示すものであり、例えば左側通行における左側の路側を照射するための１５゜左上がりの傾斜として形成されるエルボ部分などは、シャッタ４を有して自在に配光形状を設定できるプロジェクタユニット６の側からの配光Ｄ６で形成し、そして水平方向に広い範囲を照射する路面照射の部分は光量の多いよる補助レンズユニット７の側の配光Ｄ７で形成している。
【００２１】
尚、補助レンズユニット７からの光で配光Ｄ７を形成するためには左右方向に拡散を行わなければならないものとなるので、前記補助レンズユニット７の出射面部７３に拡散カット７４（図１参照）が設けられている。また、実際の実施に当たり補助レンズユニット７からの光に上向き光を含まないものとするために、前記拡散カット７４に加えて下向きに光を屈折させるプリズムカットを重複させるなどは自在である。
【００２２】
図４は本発明に係る車両用前照灯１の別な実施形態であり、前の実施形態では前記補助レンズユニット７における受光レンズ部７１は１つの方向へ向かう平行光線を発生させるための１つの曲面で形成されていたが、本発明はこれを限定するものではなく、受光レンズ部７１ａと受光レンズ部７１ｂのように２つの方向に向かう平行光線を発生させる２つの曲面など、複数の曲面で構成しても良いものである。そして、この場合には、当然に車両用前照灯１の照射方向へ光を反射するものとなる内面反射部７２も、受光レンズ部７１ａ、７１ｂに対応し、内面反射部７２ａ、７２ｂの複数となる。
【００２３】
図５は本発明の更に別の実施形態であり、前記補助レンズユニット７の出射面部７３は外部から観視される部位であり、即ち、この車両用前照灯１のデザインに関与する部位である。よって、この出射面部７３にデザインを整えるための装飾用レンズカット７５を設けることも自在であるが、このときには前記出射面部７３から放射される光に無用な屈折を生じさせないことが、配光特性の形成の面から必要となる。
【００２４】
よって、この実施形態においては、前記車両用前照灯１の中心軸Ｘに対して直交する面で装飾用レンズカット７５が形成されている。尚、この装飾用レンズカット７５は、図示のように水平方向への溝状として設けられても良く、垂直方向への溝状、斜め方向への溝状、或いは、同心円の溝状などとしても良いものである。また、前記拡散カット７４との重複も自在である。
【００２５】
【発明の効果】
以上に説明したように本発明により、光源と、この光源に第一焦点を有する楕円反射面と、前記楕円反射面の第二焦点の近傍に配置されるシャッタと、前記シャッタの近傍に焦点を有する投影レンズとから成るプロジェクタユニットを有する車両用前照灯であり、前記楕円反射面の照射方向前方であり、前記楕円反射面およびこの反射面からの反射光、前記シャッタ、前記投影レンズとに干渉を生じない位置には、前記光源からの直射光を受光し略平行光線に変換して内部に取り込む受光レンズ部と、前記受光レンズ部からの光をこの車両用前照灯の照射方向に向けて内面反射する内面反射部と、前記内面反射部からの反射光をこの車両用前照灯の照射方向に向かう光として外部に射出する出射面部とが一体の透明部材で形成された補助レンズユニットが前記プロジェクタユニットを取り囲むようにして設けられている車両用前照灯としたことで、補助レンズユニットで光源からの直射光も回収できるものとして従来のこの種の車両用前照灯に対して光束利用率を２．５倍以上と格段に向上させ、視認性の向上など性能の向上に極めて優れた効果を奏するものである。
【図面の簡単な説明】
【図１】 本発明に係る車両用前照灯の実施形態を示す正面図である。
【図２】 図１のＡ−Ａ線に沿う断面図である。
【図３】 本発明に係る車両用前照灯の配光特性を示す説明図である。
【図４】 同じく本発明に係る車両用前照灯の別の実施形態を要部で示す断面図である。
【図５】 同じく本発明に係る車両用前照灯の更に別の実施形態を要部で示す斜視図である。
【図６】 従来例を示す断面図である。
【符号の説明】
１……車両用前照灯
２……光源
３……楕円反射面
４……シャッタ
５……投影レンズ
６……プロジェクタユニット
７……補助レンズユニット
７１……受光レンズ部
７２……内面反射部
７３……出射面部
７４……拡散カット
７５……装飾用レンズカット[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a configuration of a vehicle headlamp such as a headlamp and a fog lamp. Specifically, the projector has a basic configuration as a basic configuration, and improves a luminous flux utilization rate with respect to a light source. The object is to provide a configuration that can be realized.
[0002]
[Prior art]
FIG. 6 shows a configuration of a conventional vehicle headlamp 90 of this type as an example of a projector type. The vehicle headlamp 90 has a light source 91 and a first focal point coincided with the light source 91. An elliptical reflecting surface 92, a shutter 93 installed near the second focal point f <b> 2 of the elliptical reflecting surface 92, and a projection lens 94 are configured.
[0003]
In the vehicle headlamp 90 configured as described above, the light reflected by the elliptical reflecting surface 92 out of the light from the light source 91 converges to the second focal point f2, and is substantially in the middle of the convergence. The part is shielded by the shutter 93, and the component that becomes upward light when the projection lens 94 projects in the irradiation direction is removed. Therefore, the light emitted from the vehicle headlamp 90 basically provides a passing light distribution that does not include upward light.
[0004]
Although not shown in the drawings, there is a vehicle headlamp that employs a parabolic reflecting surface such as a rotating parabolic surface instead of the elliptical reflecting surface 92, but the light flux capturing rate with respect to the light source 91 is generally It is said that the vehicular headlamp 90 employing the elliptical reflecting surface 92 is higher, and a brighter vehicular headlamp can be realized.
[0005]
[Problems to be solved by the invention]
However, in the vehicle headlamp 90 having the conventional configuration described above, the luminous flux capture rate of the elliptical reflecting surface 92 with respect to the light source 91 is about 65%, and the shutter 93 shields almost half of the light amount. Therefore, only about 35% of the light from the light source 91 reaches the projection lens 94. In addition to the above, the reflection efficiency (about 85%) of the elliptical reflecting surface 92, the transmission efficiency (about 75%) of the projection lens 94, and the like also affect the light source 91. The problem is that it is only about 23% of the light from the light source and is too low in efficiency.
[0006]
[Means for Solving the Problems]
As specific means for solving the above-described conventional problems, the present invention provides a light source, an elliptical reflecting surface having a first focal point on the light source, and a shutter disposed in the vicinity of the second focal point of the elliptical reflecting surface. A vehicular headlamp having a projector unit including a projection lens having a focal point in the vicinity of the shutter, being in front of the elliptical reflecting surface in the irradiation direction, and the reflected light from the elliptical reflecting surface and the elliptical reflecting surface In a position where no interference occurs with the optical path that converges to the second focal point, the shutter, and the projection lens, direct light from the light source that is not captured by the elliptical reflecting surface is received and converted into a substantially parallel light beam. A light receiving lens portion to be taken in, an inner surface reflecting portion that internally reflects light from the light receiving lens portion in an irradiation direction of the vehicle headlamp, and reflected light from the inner surface reflecting portion of the vehicle headlamp. Light Auxiliary lens unit and emitting surface for emitting to the outside as light directed in direction is formed by a transparent member integrally provided so as to surround the projector unit, the light receiving lens unit at least with respect to the optical axis of the projector unit The problem is solved by providing a vehicular headlamp characterized by having a substantially ring shape that directs a substantially cone-shaped parallel light beam having one inclination angle to the inner surface reflection portion .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Below, this invention is demonstrated in detail based on embodiment shown in a figure. 1 and 2 indicate a vehicle headlamp according to the present invention. The vehicle headlamp 1 includes a light source 2 and an ellipse whose first focus coincides with the light source 2. The projector unit 6 includes a reflecting surface 3, a shutter 4 provided near the second focal point f <b> 2 of the elliptical reflecting surface 3, a projection lens 5 having a focal point near the shutter 4, and an auxiliary lens unit 7. Has been.
[0008]
The projector unit 6 has substantially the same configuration as that described in the conventional example, and the detailed description thereof will be omitted except for the specific configuration in the present invention. In the present invention, the elliptical reflecting surface 3 of the projector unit 6 is set to have a shallow depth in the central axis X direction, and the conventional example captures about 65% of the light quantity from the light source 2. On the other hand, in the present invention, about 30 to 50% is captured.
[0009]
Here, if the state when the reflected light from the elliptical reflecting surface 3 converges on the second focal point f2 is considered, ignoring the size of the light source 2, the luminous flux has the second focal point f2 as an apex and is elliptically reflected. It has a conical shape with the outer diameter of the surface 3 as the bottom surface. At this time, if the depth of the elliptical reflecting surface 3 is reduced, the above-mentioned conical apex angle becomes narrower.
[0010]
Considering that the above-mentioned conical apex angle is narrowed in the state shown in FIG. 2, the angle of the upward light when converging to the second focal point f2 is reduced, that is, the vehicle headlight. The upward light component decreases from the irradiation light as the lamp 1. Therefore, by reducing the depth of the elliptical reflecting surface 3, the ratio of upward light that must be shielded by the shutter 4 is reduced, and the ratio that can be used as irradiation light with respect to the reflected light from the elliptical reflecting surface 3. It will increase.
[0011]
Incidentally, the conventional projector-type elliptical reflecting surface captures 65% of the light from the light source as described above, and about half of the light is shielded by the shutter, so about 36% is irradiated light. However, according to the present invention, the elliptical reflecting surface 3 is set shallow and the capture rate is set to 50% or less (for example, 30%), so that the shielding rate by the shutter 4 is about 30. When the capture rate is 50%, approximately 35% is used as irradiation light, and even when the capture rate is 30%, approximately 22% is used as irradiation light. However, the above numerical values exclude the reflection efficiency (about 85%) of the elliptical reflecting surface 3 and the transmission efficiency (about 75%) of the projection lens 5.
[0012]
That is, according to the present invention, the amount of light projected in the irradiation direction from the projection lens 5 of the projector unit 6 does not decrease so much from the conventional one, although the elliptical reflecting surface 3 is set shallow. At the same time, since the elliptical reflection surface 3 is set shallow, the ratio of light that is not captured by the elliptical reflection surface 3 of the light source 2 increases. Therefore, in the present invention, light that is not captured by the elliptical reflection surface 3 is transmitted by the auxiliary lens unit 7. It is collected and used as irradiation light.
[0013]
The auxiliary lens unit 7 is provided in front of the elliptical reflecting surface 3 in the irradiation direction. At this time, the reflected light from the elliptical reflecting surface 3 does not interfere with the optical path that converges on the second focal point f2, Further, it is provided so as not to cause positional interference with the shutter 4 and the projection lens 5.
[0014]
The auxiliary lens unit 7 receives direct light from the light source 2 and converts the light into a parallel light beam directed in a predetermined direction inside the member on which the auxiliary lens unit 7 is formed, and the light receiving unit. An inner surface reflection portion 72 that is provided on the traveling direction side of the light from the lens portion 71 and converts the path of the light to the irradiation direction of the vehicle headlamp 1 and an emission surface portion that emits the inner surface reflection portion 72 to the outside of the lamp 73 is provided.
[0015]
That is, the auxiliary lens unit 7 is formed of an integral transparent member from the light receiving lens portion 71 to the emission surface portion 73, and the reflection of the parallel light beam at the inner surface reflection portion 72 is a resin on which the auxiliary lens unit 7 is formed. It is performed at the interface between the high refractive member (refractive index = approximately 1.5) and the atmosphere (refractive index = 1.0).
[0016]
Here, the overall shape of the auxiliary lens unit 7 will be described. Since the light source 2 basically emits light in all directions, the shape shown in cross section in FIG. The shape rotated around the central axis X of the lamp 1 can set a high light flux capturing rate for the light source 2. Therefore, also in the present invention, the auxiliary lens unit 7 is formed as the shape described above.
[0017]
As described above, by providing the elliptical reflecting surface 3 and the auxiliary lens unit 7 for one light source 2 according to the present invention, it is necessary to distribute the light to the both 3 and 7 at an appropriate ratio. Here, according to the result of examination by the inventors, it was confirmed that the projector unit 6 and the auxiliary lens unit 7 are not provided with the shutter 4 and that the auxiliary lens unit 7 is more light efficient.
[0018]
Therefore, in the present invention, the distribution ratio of the light from the light source 2 is as follows: the projector unit 6 = 30% and the auxiliary lens unit 7 = 65% in order to achieve the vehicle headlamp 1 that is as bright as possible, which is the original purpose. Set. The present invention does not limit the distribution ratio described above, and can be freely set depending on the purpose expected of the vehicle headlamp 1 such as emphasizing the shape of light distribution.
[0019]
By doing so, the projector unit 6 projects about 14% of the light from the light source 2 as irradiation light, and the auxiliary lens unit 7 projects about 49% of the light from the light source 2 as irradiation light. In total, 63% of light was used as irradiation light. If this is compared with the efficiency 23% of the vehicle headlamp of the conventional example, the vehicle headlamp of the present invention is 2.5 times or more brighter, which has a remarkable effect on improving the visibility. is there.
[0020]
FIG. 3 shows an example of a light distribution characteristic (passing light distribution) D in the vehicle headlamp 1 according to the present invention. For example, as a 15 ° upward slope for illuminating the left roadside in left-hand traffic The elbow portion to be formed is formed by the light distribution D6 from the side of the projector unit 6 which has the shutter 4 and can freely set the light distribution shape, and the road surface irradiation portion which irradiates a wide range in the horizontal direction is The light distribution D7 on the side of the auxiliary lens unit 7 with a large amount of light is used.
[0021]
In addition, in order to form the light distribution D7 with the light from the auxiliary lens unit 7, it is necessary to perform diffusion in the left-right direction. Therefore, a diffusion cut 74 (see FIG. 1) is formed on the emission surface portion 73 of the auxiliary lens unit 7. ) Is provided. In actual implementation, in order to prevent the light from the auxiliary lens unit 7 from including upward light, it is possible to overlap a prism cut that refracts light downward in addition to the diffusion cut 74.
[0022]
FIG. 4 shows another embodiment of the vehicular headlamp 1 according to the present invention. In the previous embodiment, the light receiving lens portion 71 in the auxiliary lens unit 7 generates 1 parallel light beams in one direction. However, the present invention is not limited to this, and a plurality of curved surfaces such as two curved surfaces that generate parallel light beams in two directions as in the light receiving lens portion 71a and the light receiving lens portion 71b. It may be configured with. In this case, the internal reflection part 72 that naturally reflects light in the irradiation direction of the vehicle headlamp 1 also corresponds to the light receiving lens parts 71a and 71b, and a plurality of internal reflection parts 72a and 72b. It becomes.
[0023]
FIG. 5 shows still another embodiment of the present invention. The exit surface portion 73 of the auxiliary lens unit 7 is a part viewed from the outside, that is, a part related to the design of the vehicle headlamp 1. is there. Therefore, it is possible to provide a decorative lens cut 75 for adjusting the design on the exit surface portion 73. At this time, it is possible to prevent unnecessary refraction from occurring in the light emitted from the exit surface portion 73. It is necessary from the aspect of formation.
[0024]
Therefore, in this embodiment, the decorative lens cut 75 is formed on a surface orthogonal to the central axis X of the vehicle headlamp 1. The decorative lens cut 75 may be provided as a horizontal groove as shown in the figure, or may be provided as a vertical groove, a diagonal groove, or a concentric groove. It ’s good. Moreover, the overlap with the diffusion cut 74 is also free.
[0025]
【The invention's effect】
As described above, according to the present invention, the light source, the elliptical reflecting surface having the first focal point on the light source, the shutter disposed in the vicinity of the second focal point of the elliptical reflecting surface, and the focal point in the vicinity of the shutter. A headlamp for a vehicle having a projector unit comprising a projection lens having a projection unit, the front of the elliptical reflection surface in the irradiation direction, the reflected light from the elliptical reflection surface and the reflection surface, the shutter, and the projection lens In a position where interference does not occur, a light receiving lens unit that receives direct light from the light source, converts it into a substantially parallel light beam, and takes it in, and light from the light receiving lens unit in the direction of irradiation of the vehicle headlamp An auxiliary lens in which an inner surface reflecting portion that reflects the inner surface toward the inner surface and an exit surface portion that emits the reflected light from the inner surface reflecting portion to the outside as light directed in the irradiation direction of the vehicular headlamp are formed of an integral transparent member. Since the vehicle headlamp is provided so that the unit surrounds the projector unit, the auxiliary lens unit can also collect direct light from the light source. Thus, the luminous flux utilization rate is remarkably improved to 2.5 times or more, and an extremely excellent effect for improving the performance such as visibility is obtained.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of a vehicle headlamp according to the present invention.
FIG. 2 is a cross-sectional view taken along the line AA in FIG.
FIG. 3 is an explanatory diagram showing light distribution characteristics of the vehicle headlamp according to the present invention.
FIG. 4 is a cross-sectional view showing a main part of another embodiment of a vehicle headlamp according to the present invention.
FIG. 5 is a perspective view showing a main part of still another embodiment of the vehicle headlamp according to the present invention.
FIG. 6 is a cross-sectional view showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Vehicle headlamp 2 ... Light source 3 ... Ellipse reflection surface 4 ... Shutter 5 ... Projection lens 6 ... Projector unit 7 ... Auxiliary lens unit 71 ... Light-receiving lens part 72 ... Internal reflection part 73 …… Exit surface 74 …… Diffusion cut 75 …… Decoration lens cut

Claims (2)

光源と、この光源に第一焦点を有する楕円反射面と、前記楕円反射面の第二焦点の近傍に配置されるシャッタと、前記シャッタの近傍に焦点を有する投影レンズとから成るプロジェクタユニットを有する車両用前照灯であり、前記楕円反射面の照射方向前方であり、前記楕円反射面およびこの楕円反射面からの反射光が第二焦点に収束する光路、前記シャッタ、前記投影レンズとに干渉を生じない位置には、前記楕円反射面に補足されない前記光源からの直射光を受光し略平行光線に変換して内部に取り込む受光レンズ部と、前記受光レンズ部からの光をこの車両用前照灯の照射方向に向けて内面反射する内面反射部と、前記内面反射部からの反射光をこの車両用前照灯の照射方向に向かう光として外部に射出する出射面部とが一体の透明部材で形成された補助レンズユニットが前記プロジェクタユニットを取り囲むようにして設けられ、前記受光レンズ部は前記プロジェクタユニットの光軸に対し少なくとも一つの傾き角を有する略コーン状の平行光線を前記内面反射部に向かわせる略リング状であることを特徴とする車両用前照灯。A projector unit comprising: a light source; an elliptical reflecting surface having a first focal point on the light source; a shutter disposed in the vicinity of the second focal point of the elliptical reflecting surface; and a projection lens having a focal point in the vicinity of the shutter It is a vehicle headlamp, is in front of the elliptical reflecting surface in the irradiation direction, and interferes with the elliptical reflecting surface and an optical path in which reflected light from the elliptical reflecting surface converges to a second focal point, the shutter, and the projection lens. The light receiving lens unit that receives direct light from the light source that is not captured by the elliptical reflecting surface, converts the light into a substantially parallel light, and takes it into the interior, and the light from the light receiving lens unit in front of the vehicle. A transparent portion in which an inner surface reflecting portion that reflects the inner surface in the irradiation direction of the headlamp and an exit surface portion that emits the reflected light from the inner surface reflecting portion as light directed in the irradiation direction of the vehicle headlamp are integrated. In forming auxiliary lens unit is provided so as to surround the projector unit, the light receiving lens portion the internal reflection portion substantially cone-shaped parallel beam having at least one angle of inclination with respect to the optical axis of the projector unit A vehicular headlamp characterized by having a substantially ring shape directed toward the vehicle. 前記補助レンズユニットの出射面部にはこの車両用前照灯の配光特性を形成するため、及び／または、この車両用前照灯のデザインを整えるためのレンズカットが施されていることを特徴とする請求項１記載の車両用前照灯。The exit surface portion of the auxiliary lens unit is provided with a lens cut for forming the light distribution characteristics of the vehicle headlamp and / or for adjusting the design of the vehicle headlamp. The vehicle headlamp according to claim 1 .
JP2001272464A 2001-09-07 2001-09-07 Vehicle headlamp Expired - Fee Related JP4565603B2 (en)

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FR2856774B1 (en) * 2003-06-24 2005-09-02 Valeo Vision MOTOR VEHICLE PROJECTOR COMPRISING MEANS FOR VERTICALLY DETERMINING THE LIGHT BEAM
ITTO20030583A1 (en) * 2003-07-25 2005-01-26 Automotive Lighting Italia Spa LIGHTING DEVICE FOR VEHICLES WITH REFLECTOR
FR2878020B1 (en) 2004-11-18 2008-12-19 Valeo Vision Sa LIGHTING AND / OR SIGNALING DEVICE FOR A MOTOR VEHICLE PRODUCING A BEAM ON THE SIDE OF A MOTOR VEHICLE
JP4563912B2 (en) * 2005-10-05 2010-10-20 本田技研工業株式会社 Vehicle headlamp structure
JP5043597B2 (en) * 2007-10-24 2012-10-10 スタンレー電気株式会社 Direct projection lighting
JP2010080306A (en) * 2008-09-26 2010-04-08 Stanley Electric Co Ltd Lighting fixture unit for vehicular headlight
JP5691514B2 (en) * 2010-12-28 2015-04-01 スタンレー電気株式会社 Projector headlamps for motorcycles
CN104602997B (en) * 2012-09-07 2017-11-10 三菱电机株式会社 Vehicle headlamp apparatus
AT514217B1 (en) * 2013-05-08 2016-02-15 Zizala Lichtsysteme Gmbh Lighting device for motor vehicles

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