JPH0472404U

JPH0472404U -

Info

Publication number: JPH0472404U
Application number: JP10108190U
Authority: JP
Priority date: 1990-06-19
Filing date: 1990-09-28
Publication date: 1992-06-25
Anticipated expiration: 2005-09-28
Also published as: JPH084643Y2

Description

[Brief explanation of the drawing]

第１図は本考案に係る自動車用前照灯の一実施
例を示し、第１図Ａは前面レンズを取り外して描
いた正面図、第１図ＢはそのＢ−Ｂ断面図、第１
図Ｃは同じくＣ−Ｃ断面図である。第２図Ａは上
記実施例の正面図、第２図Ｂは同じくステツププ
リズムの断面図、第２図Ｃは同じく素通しレンズ
の断面図である。第３図は上記実施例の配光パタ
ーンを示す平面図であつて、第３図Ａは前面レン
ズを取り外した状態を表わし、第３図Ｂは前面レ
ンズを装着した状態を表わしている。第４図は前
記実施例の作用、効果を説明するために示したも
ので、第４図Ａはスクリーン上の配光を表わした
図表、第４図Ｂは水平断面図に光路図を付記した
図である。第５図及び第６図は、それぞれ従来例
の前照灯を示す断面図である。第７図Ａ，Ｂ，Ｃ
、第８図Ａ，Ｂ、第９図および第１０図はそれぞ
れ先願の発明に係る自動車用前照灯の説明図であ
る。１……ランプハウジング、１ａ……上記ランプ
ハウジングの内面に設けられた反射面、２，２′
……光源バルブ、３……プリズムレンズによつて
構成された前面レンズ、４……従来例の、リフレ
クタ拡散形前照灯のリフレクタ、５……素通し形
の前面レンズ、６……側方に存在する障害物、７
……先願の発明の実施例におけるリフレクタ、１
１……ランプハウジング、１２……前面レンズ、
１２ａ……平行光束反射面、１２ｂ……拡散光束
反射面、１３……フイラメント、１４……前面レ
ンズ、１４ａ……ステツププリズム部、１４ｂ…
…素通しに近い単純拡散プリズム部、１４ｃ……
ステツププリズム部、Ｆ……光源位置、Ｚ……光
軸、Ｘ……水平座標軸、Ｙ……垂直座標軸。 Fig. 1 shows an embodiment of an automobile headlamp according to the present invention, Fig. 1A is a front view with the front lens removed, Fig. 1B is a sectional view taken along line B-B, and Fig.
Figure C is also a CC sectional view. FIG. 2A is a front view of the above embodiment, FIG. 2B is a sectional view of the step prism, and FIG. 2C is a sectional view of the transparent lens. FIG. 3 is a plan view showing the light distribution pattern of the above embodiment, in which FIG. 3A shows the state with the front lens removed, and FIG. 3B shows the state with the front lens attached. Fig. 4 is shown to explain the function and effect of the above embodiment, Fig. 4A is a diagram showing the light distribution on the screen, and Fig. 4B is a horizontal sectional view with an optical path diagram added. It is a diagram. FIGS. 5 and 6 are cross-sectional views showing conventional headlights, respectively. Figure 7 A, B, C
, FIGS. 8A and 8B, FIGS. 9 and 10 are explanatory diagrams of the automobile headlamp according to the invention of the earlier application, respectively. 1... Lamp housing, 1a... Reflective surface provided on the inner surface of the lamp housing, 2, 2'
...Light source bulb, 3...Front lens constituted by a prism lens, 4...Reflector of a conventional reflector diffused headlamp, 5...Through-through front lens, 6...On the side Obstacles that exist, 7
...Reflector in the embodiment of the invention of the prior application, 1
1...Lamp housing, 12...Front lens,
12a... Parallel light flux reflecting surface, 12b... Diffused light flux reflecting surface, 13... Filament, 14... Front lens, 14a... Step prism portion, 14b...
...Simple diffusion prism section that is almost transparent, 14c...
Step prism section, F...Light source position, Z...Optical axis, X...Horizontal coordinate axis, Y...Vertical coordinate axis.

Claims

[Scope of Claim for Utility Model Registration] An automobile headlamp having a structure in which a light source bulb is installed near the focal point of a concave mirror, and a front lens is provided to cover the front opening of the concave mirror, wherein the filament of the light source bulb is , disposed in a horizontal direction perpendicular to the optical axis of the concave mirror, and by a radial boundary passing near the filament, the reflecting surface of the concave mirror is divided into a parallel light beam reflecting surface and a diffused light beam reflecting surface. The parallel light beam reflecting surface is constituted by a paraboloid of revolution whose focal point is aligned near the center of the filament, and the diffused light beam reflecting surface is configured to reflect light incident from the filament. At least a portion of the light is diffused and reflected from side to side in a substantially horizontal direction;
Further, the diffused light beam reflecting surface is configured so that the closer to the center it is, the stronger the diffusivity is, and the area where the parallel light beam reflected by the parallel light beam reflecting surface passes through the front lens has horizontally incident light. a step prism that refracts the light upward; a step prism similar to or similar to the step prism is provided in a part of the area where the light beam including the diffused light reflected by the diffused light beam reflection surface passes through the front lens; An automobile headlamp characterized in that the remaining portion thereof is provided with a prism having no steps.