JPS62211801A - Projector type head lamp for automobile - Google Patents
Projector type head lamp for automobileInfo
- Publication number
- JPS62211801A JPS62211801A JP61053662A JP5366286A JPS62211801A JP S62211801 A JPS62211801 A JP S62211801A JP 61053662 A JP61053662 A JP 61053662A JP 5366286 A JP5366286 A JP 5366286A JP S62211801 A JPS62211801 A JP S62211801A
- Authority
- JP
- Japan
- Prior art keywords
- concave mirror
- light
- focal point
- reflective surface
- filament
- 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.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 claims description 11
- 230000004907 flux Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 8
- 102100030334 Friend leukemia integration 1 transcription factor Human genes 0.000 description 4
- 101001062996 Homo sapiens Friend leukemia integration 1 transcription factor Proteins 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
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- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はプロジェクタ型の自動車用前照灯に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a projector type automobile headlamp.
第１０図は従来のプロジェクタ型前照灯の１例を示す側
面図、第１１図は同じくＴ面図、第１２図は同じく正面
図である。FIG. 10 is a side view showing an example of a conventional projector type headlamp, FIG. 11 is a T-side view, and FIG. 12 is a front view.
ｌは凹面鏡、Ｚ−Ｚはその光軸、Ｆはその焦点である。l is a concave mirror, Z-Z is its optical axis, and F is its focal point.
該焦点付近に光源バルブ２が設置される。A light source bulb 2 is installed near the focal point.
前記の凹面鏡１と光軸を一致せしめて凸レンズ３が設け
られる。第１１図に示したｉ−ｊは凸レンズ３のメリジ
オナル像面を示しており、光源バルブ２から出射して凹
面鏡１で反射された光は上記メリジオナル像面に入射す
る。A convex lens 3 is provided with its optical axis aligned with the concave mirror 1 described above. 11 indicates the meridional image plane of the convex lens 3, and the light emitted from the light source bulb 2 and reflected by the concave mirror 1 enters the meridional image plane.
上記の入射光は凸レンズ３で調光されて、前方（第１０
図、第１１図において右方）に投射される。The above incident light is modulated by the convex lens 3 and is directed forward (10th
11).
前記メリジオナル像面の付近にスクリーンを設けて等照
度曲線を描くと第１３図のようになる。Ｈ−Ｈはスクリ
ーン上の水平線、■−■は同じく垂直線である。If a screen is provided near the meridional image plane and an isoluminance curve is drawn, the result will be as shown in FIG. 13. HH is a horizontal line on the screen, and ■-■ is also a vertical line.
第１０図〜第１２図に示すように、メリジオナル像面に
沿ってシェード４を設ける。第１２図に示したようにメ
リジオナル像面ｉ−ｊから退くようにカットライン４ａ
が形成されている。As shown in FIGS. 10 to 12, a shade 4 is provided along the meridional image plane. As shown in FIG. 12, the cut line 4a is moved away from the meridional image plane i-j.
is formed.
このようにして、シェード４によって部分的に覆われた
光束は、メリジオナル像面近傍に集光して交差するので
、前照灯の前方にスクリーンを置いて等照度曲線を描く
と、第１４図に示すように、第１３図を反転させた形の
配光パターンが得られる。In this way, the light flux partially covered by the shade 4 converges near the meridional image plane and intersects, so if a screen is placed in front of the headlight and an isoluminous curve is drawn, as shown in Figure 14. As shown in FIG. 13, a light distribution pattern that is an inversion of FIG. 13 is obtained.
この従来例の左側通行用に構成されたものであり、右側
通行用の場合は第１２図乃至第１４図が左右勝手違いと
なるように構成される。This conventional example is constructed for left-hand traffic, and in the case of right-hand traffic, the left and right hands of FIGS. 12 to 14 are different.
上に述べたように、プロジェクタ型前照灯によれば第１
４図の如（、対向車に眩惑を与える虞れ無く、自己走行
車線前方を照明することが出来るが、第１３図について
説明したように光束の半分近くをシェードで遮られるの
で光束の有効利用率が低い。As mentioned above, according to the projector type headlight, the first
As shown in Figure 4, it is possible to illuminate the area in front of the vehicle's lane without the risk of dazzling oncoming vehicles, but as explained in Figure 13, nearly half of the luminous flux is blocked by the shade, so the luminous flux cannot be used effectively. rate is low.
しかし、従来技術においては対向車に眩惑を与えないよ
う、Ｈ−Ｈラインよりも上方に投光しない形の配光パタ
ーン（例えば第１４図）を得るには、光束の半分近くを
シェードで覆い遮らざるを得なかった。However, in the conventional technology, in order to obtain a light distribution pattern that does not project light above the H-H line (for example, Fig. 14) so as not to dazzle oncoming vehicles, nearly half of the luminous flux is covered with a shade. I had no choice but to interrupt.
本発明は上述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、対向車に眩惑を与える虞れ無く、しか
も光束の有効利用率の高いプロジェクタ型の自動車用前
照灯を提供しようとするものである。The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide a projector-type automobile headlamp that does not cause dazzling to oncoming vehicles and has a high luminous flux efficiency. This is what I am trying to do.
上記の目的を達成する為、本発明に係るプロジェクタ型
前照灯は、凹面鏡の焦点の近傍に光源バルブを設置し、
上記の光源バルブから出射した光が凹面鏡で反射されて
カットラインを有するシェード近傍で焦点を結び、上記
の反射光を凸レンズによって投射するプロジェクタ型自
動車用前照灯において、前記の凹面鏡を上下の区域に分
割して、上方区域の反射面と下方区域の反射面との光軸
を共有せしめると共に、光源バルブのフィラメントの長
手方向を上記の光軸に沿わせて設置し、かつ、前記上方
区域の反射面の焦点をフィラメントの中心よりも前方寄
りに位置せしめ、下方区域の反射面の焦点をフィラメン
トの中心より後方寄りに位置せしめたことを特徴とする
。In order to achieve the above object, the projector type headlamp according to the present invention includes a light source bulb installed near the focal point of the concave mirror,
In a projector type automobile headlamp, the light emitted from the light source bulb is reflected by a concave mirror and focused near a shade having a cut line, and the reflected light is projected by a convex lens. The reflective surface of the upper area and the reflective surface of the lower area share the optical axis, and the longitudinal direction of the filament of the light source bulb is installed along the optical axis, and the reflective surface of the upper area is divided into It is characterized in that the focal point of the reflective surface is located closer to the front than the center of the filament, and the focal point of the reflective surface in the lower area is located closer to the rear than the center of the filament.
上記のように構成したプロジェクタ型前照灯においては
、上方区域の反射光も下方区域の反射光も、メリジオナ
ル像面付近において主として光軸の上方に集光され、投
射光束の配光パターンは主としてＨ−Ｈラインの下方に
形成され、シェードに遮られることなく、対向車に眩惑
を与えない。In the projector-type headlamp configured as described above, both the reflected light in the upper area and the reflected light in the lower area are mainly focused above the optical axis in the vicinity of the meridional image plane, and the light distribution pattern of the projected light flux is mainly It is formed below the H-H line and is not obstructed by the shade and does not dazzle oncoming vehicles.
第１図は本発明の１実施例を示す、同図（Ａ）は模式的
に描いた側面図で、１１は凹面鏡、１３は凸レンズであ
る。凹面鏡１１の正面図を模式的に描くと同図（Ｂ）に
示す如くである。FIG. 1 shows one embodiment of the present invention. FIG. 1A is a schematic side view, in which 11 is a concave mirror and 13 is a convex lens. A schematic front view of the concave mirror 11 is shown in FIG.
凹面鏡１１を上半部１１ｕと下半部１１ｏとに区分する
。The concave mirror 11 is divided into an upper half 11u and a lower half 11o.
本実施例においては、上半部１１ｕと下半部１１ｏとを
、それぞれ光軸Ｚ−Ｚを共有する回転放物面に構成しで
ある。In this embodiment, the upper half part 11u and the lower half part 11o are configured as paraboloids of revolution that share the optical axis Z-Z.
光源バルブのフィラメント２ａの長手方向を光軸Ｚ−Ｚ
に沿わせるように、光源バルブ２を配設する。The longitudinal direction of the filament 2a of the light source bulb is the optical axis Z-Z.
The light source bulb 2 is arranged along the
凹面鏡の上半部１１ｕの反射面の第１焦点ＦＬＩ−１は
、フィラメント２ａの中心よりも前方寄りに位置せしめ
、その第２焦点Ｆ２は凸レンズ１３のメリジオナル像面
１４上に位置せしめる。The first focal point FLI-1 of the reflective surface of the upper half 11u of the concave mirror is located closer to the front than the center of the filament 2a, and the second focal point F2 is located on the meridional image plane 14 of the convex lens 13.
また、下半部１１．の反射面の第１焦点Ｆ０−１はフイ
ラメン）２ａの後端付近に位置せしめ、第２焦点は前記
の点Ｆ２と一致せしめる。In addition, the lower half 11. The first focal point F0-1 of the reflecting surface is located near the rear end of the filament 2a, and the second focal point is coincident with the aforementioned point F2.
これにより、第１焦点ＦＬＩ−１から出射して上半部１
１．で反射した光、及び、第１焦点ＦＤ−１から出射し
て下半部ＬＩＤで反射した光は、第２焦点Ｆ２に集光す
る。As a result, the light is emitted from the first focal point FLI-1 and the upper half 1
1. The light reflected by the first focal point FD-1 and the light emitted from the first focal point FD-1 and reflected by the lower half LID are focused on the second focal point F2.
第２図に示すごとく、第１焦点ＦＬＩ−１から矢印ａの
如く出射した光は、凹面鏡上半部１１ｕで矢印すの如く
第２焦点Ｆ２に集光する。そして、第１焦点Ｆｕ−１よ
りも後方に位置するフィラメント２ａから矢印Ｃの如く
出射して上半部１１．で反射した光は矢印ｄの如く第２
焦点Ｆ２の上方を通る。As shown in FIG. 2, light emitted from the first focal point FLI-1 as indicated by the arrow a is condensed at the second focal point F2 as indicated by the arrow A at the upper half portion 11u of the concave mirror. Then, the light is emitted from the filament 2a located behind the first focal point Fu-1 as shown by the arrow C, and the upper half 11. The light reflected by the second
It passes above the focal point F2.
このようにして、比喰的に言うならば、フイラメン！−
２８の像２ｕがメリジオナル像面１４の上半部に結ばれ
る。ただし、カメラのフィルム面上における如く正確な
相似形の実像を結ぶものではなく、仮想線で示した２ｕ
の付近に集光するというほどの意味である。In this way, figuratively speaking, Firamen! −
28 images 2u are focused on the upper half of the meridional image plane 14. However, it does not form a real image of an accurate similar shape as on the film surface of a camera, but the 2u
This means that the light is concentrated near .
上記メリジオナル像面付近の光束密度の分布を等密度曲
線で示すと第３図の如くである。この光束は凸レンズ１
３で調光され、これを反転した形で第４図のような配光
パターン（前照灯前方のスクリーンを照明した場合の等
照度曲線）を形式する。The distribution of the luminous flux density in the vicinity of the meridional image plane is shown in FIG. 3 by isodensity curves. This light flux is the convex lens 1
3, and by inverting this, a light distribution pattern (isoluminance curve when the screen in front of the headlight is illuminated) as shown in FIG. 4 is formed.
第５図に示す如く、フィラメント２ａから出射して凹面
鏡下半部１１．で反射した光は、矢印Ｃ２ｇの如く、仮
想線２Ｄ付近に集光し、第６図に示す光束密度を形成し
て第７図のような配光パターンとなる。As shown in FIG. 5, light is emitted from the filament 2a and the concave mirror lower half 11. The reflected light is focused near the virtual line 2D as indicated by the arrow C2g, forming the luminous flux density shown in FIG. 6, resulting in a light distribution pattern as shown in FIG. 7.
以上の説明は、凹面鏡上、下半分のそれぞれに区分して
述べたが、実際のメリジオナル像面上での光束密度分布
は第８図の如くになり、配光パターンは第９図の如（に
なる。この第９図の配光パターンは第４図と第７図とを
重ね合わせたものに相当している。The above explanation has been made separately for the upper and lower halves of the concave mirror, but the actual luminous flux density distribution on the meridional image plane is as shown in Figure 8, and the light distribution pattern is as shown in Figure 9. The light distribution pattern in FIG. 9 corresponds to the superposition of FIG. 4 and FIG. 7.
この第９図から明らかなように、主としてＨ−Ｈライン
の下方が照明され、対向車に舷窓を与える虞れが無い。As is clear from FIG. 9, the area below the H-H line is mainly illuminated, and there is no risk of exposing the porthole to oncoming vehicles.
本例の配光パターン（第９図）はフォグランプ用に好適
な特性を有している。この配光パターンを修正するため
、補助的にシェードを設けることも可能である。The light distribution pattern of this example (FIG. 9) has characteristics suitable for fog lamps. In order to modify this light distribution pattern, it is also possible to provide an auxiliary shade.
以上詳述したように、本発明のプロジェクタ型自動車用
前照灯は、シェードを省略し得るから構成が簡単で、シ
ェードによって遮られないので光束の有効利用率が高い
。As described in detail above, the projector type automobile headlamp of the present invention has a simple structure because the shade can be omitted, and the effective utilization rate of the luminous flux is high because it is not blocked by the shade.
第１図乃至第４図は本発明のプロジェクタ型自動車用前
照灯の１実施例を示し、第１図は模式的に描いた構成の
説明図、第２図は凹面鏡上半部の光路図、第３図及び第
４図は同じく上半部の作用を説明する為の図表、第５図
は凹面鏡下半部の光路図、第６図及び第７図は同じく下
半部の作用を説明する為の図表、第８図は凹面鏡全体の
反射光束の分布密度の図表、第９図は同じく配光パター
ンの図表である。
第１０図は従来のプロジェクタ型前照灯の１例における
側面図、第１１図は同じく平面図、第１２図は同じく正
面図である。第１３図は上記従来例の光学的機能の説明
図、第１４図は同じく配光パターン図表である。
１・・・凹面鏡、２・・・光源バルブ、２ａ・・・フィ
ラメント、３・・・凸レンズ、４・・・シェード、４ａ
・・・カットライン、１１・・・凹面鏡、ｌｌｕ・・・
凹面鏡上手部、１１゜・・・凹面鏡下半部、１３・・・
凸レンズ、１４・・・メリジオナル像面、ＦＬＩ−１・
・・凹面鏡上半部の第１焦点、Ｆ’ｏ−ｔ・・・凹面鏡
下半部の第１焦点、Ｆ、ｌ・・・凹面鏡上半部及び下半
部の第２焦点。
特許出願人 市光工業株式会社
代理人 弁理士 秋 本 正 実
疹 ３ 問
悌 ６ 図
第 ８ 図
第１０図
槃 ブ３ ｒ四1 to 4 show one embodiment of the projector type automobile headlamp of the present invention, FIG. 1 is a schematic explanatory diagram of the configuration, and FIG. 2 is an optical path diagram of the upper half of the concave mirror. , Figures 3 and 4 are diagrams for explaining the action of the upper half, Figure 5 is an optical path diagram of the lower half of the concave mirror, and Figures 6 and 7 are diagrams for explaining the action of the lower half. Figure 8 is a diagram of the distribution density of the reflected light flux of the entire concave mirror, and Figure 9 is a diagram of the light distribution pattern. FIG. 10 is a side view of an example of a conventional projector type headlamp, FIG. 11 is a plan view, and FIG. 12 is a front view. FIG. 13 is an explanatory diagram of the optical function of the conventional example, and FIG. 14 is a light distribution pattern chart. 1... Concave mirror, 2... Light source bulb, 2a... Filament, 3... Convex lens, 4... Shade, 4a
...cut line, 11...concave mirror, llu...
Upper part of concave mirror, 11°...Lower half of concave mirror, 13...
Convex lens, 14... Meridional image surface, FLI-1.
...First focus of the upper half of the concave mirror, F'o-t...First focus of the lower half of the concave mirror, F, l...Second focus of the upper and lower half of the concave mirror. Patent applicant: Ichikoh Kogyo Co., Ltd. Representative Patent attorney Tadashi Akimoto 3 Questions 6 Figure 8 Figure 10
Claims (1)
光源バルブから出射した光が凹面鏡で反射されてカット
ラインを有するシェード近傍で焦点を結び、上記の反射
光を凸レンズによって投射するプロジェクタ型自動車用
前照灯において、前記の凹面鏡を上下の区域に分割して
、上方区域の反射面と下方区域の反射面との光軸を共有
せしめると共に、光源バルブのフィラメントの長手方向
を上記の光軸に沿わせて設置し、かつ、前記上方区域の
反射面の焦点をフィラメントの中心よりも前方寄りに位
置せしめ、下方区域の反射面の焦点をフィラメントの中
心よりも後方寄りに位置せしめたことを特徴とするプロ
ジェクタ型自動車用前照灯。1. A projector type in which a light source bulb is installed near the focal point of a concave mirror, the light emitted from the light source bulb is reflected by the concave mirror and focused near a shade with a cut line, and the reflected light is projected by a convex lens. In an automobile headlamp, the concave mirror described above is divided into upper and lower regions so that the reflective surface of the upper region and the reflective surface of the lower region share the optical axis, and the longitudinal direction of the filament of the light source bulb is aligned with the above-mentioned light beam. installed along the axis, and the focal point of the reflective surface in the upper area is positioned closer to the front than the center of the filament, and the focal point of the reflective surface in the lower area is positioned closer to the rear than the center of the filament. A projector-type automobile headlamp featuring:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61053662A JPH0646523B2 (en) | 1986-03-13 | 1986-03-13 | Projector type automobile headlights |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61053662A JPH0646523B2 (en) | 1986-03-13 | 1986-03-13 | Projector type automobile headlights |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62211801A true JPS62211801A (en) | 1987-09-17 |
| JPH0646523B2 JPH0646523B2 (en) | 1994-06-15 |
Family
ID=12949063
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61053662A Expired - Lifetime JPH0646523B2 (en) | 1986-03-13 | 1986-03-13 | Projector type automobile headlights |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0646523B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0388202U (en) * | 1989-12-27 | 1991-09-10 |
-
1986
- 1986-03-13 JP JP61053662A patent/JPH0646523B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0388202U (en) * | 1989-12-27 | 1991-09-10 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0646523B2 (en) | 1994-06-15 |
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