JPH0368302U

JPH0368302U -

Info

Publication number: JPH0368302U
Application number: JP12787789U
Authority: JP
Priority date: 1989-11-02
Filing date: 1989-11-02
Publication date: 1991-07-04
Anticipated expiration: 2004-11-02
Also published as: JPH076562Y2

Description

[Brief explanation of the drawing]

第１図はレンズを取り外した状態の本考案の一
実施例であるヘツドランプの斜視図、第２図はヘ
ツドランプの縦断面図、第３図はリフレクターの
反射放物面を示す正面図、第４図ａ，ｂはそれぞ
れ反射放物面と放電部との配置の一例を示す図、
第５図は第４図ａ，ｂに示すリフレクター形状に
おけるサブビームの配光パターンを示す図、第６
図ａ，ｂは第４図ａ，ｂに示すリフレクター形状
におけるメインビームの配光パターンを示す図、
第７図ａ，ｂは本考案の他の実施例の要部である
リフレクターの縦断面形状を示す図、第８図ａ，
ｂは第７図ａ，ｂに示すリフレクター形状におけ
るメインビームの配光パターンを示す図、第９図
は本考案の他の実施例の要部であるリフレクター
の反射放物面を示す平面図、第１０図及び第１１
図はリフレクターの縦断面形状を示す図で、それ
ぞれ第９図に示す線−、線ＸＩ−ＸＩに沿う
断面図、第１２図及び第１３図は同リフレクター
によるサブビーム及びメインビームの配光パター
ンを示す図、第１４図は本考案の他の実施例の要
部であるリフレクターの反射放物面を示す正面図
、第１５図は第１４図に示す線−に沿う
断面図、第１６図は第９図及び第１４図に示すリ
フレクターにおいて使用されるシエード部材の要
部斜視図、第１７図はシエード部材のさらに他の
実施例の要部斜視図、第１８図及び第１９図はそ
れぞれシエード部材スライド機構の他の実施例を
示す図、第２０図ａ〜ｂはそれぞれリフレクター
と放電バルブ発光部との位置関係を示す図、第２
１図ａ〜ｃは第２０図ａ〜ｃに示すそれぞれの場
合におけるメインビームの配光パターンを示す図
、第２２図ａ〜ｃは第２０図ａ〜ｂに示すそれぞ
れ場合におけるサブビームの配光パターンを示す
図である。１０……ランプボデイ、１２……リフレクター
、２０……放電バルブ、２１……放電部、３０…
…シエード部材、３２……シエード本体、１２Ａ
……上側反射放物面、１２Ｂ……下側反射放物面
、Ｐ_１……上側反射放物面の焦点位置、Ｐ_２，Ｐ
_３……下側反射放物面の焦点位置。 Fig. 1 is a perspective view of a headlamp, which is an embodiment of the present invention, with the lens removed; Fig. 2 is a longitudinal sectional view of the headlamp; Fig. 3 is a front view showing the reflective paraboloid of the reflector; Figures a and b are diagrams each showing an example of the arrangement of the reflective paraboloid and the discharge part,
Figure 5 is a diagram showing the light distribution pattern of sub-beams in the reflector shapes shown in Figures 4a and b;
Figures a and b are diagrams showing the light distribution pattern of the main beam in the reflector shape shown in Figure 4 a and b,
FIGS. 7a and 7b are views showing the longitudinal cross-sectional shape of a reflector that is the main part of another embodiment of the present invention, and FIGS.
b is a diagram showing the light distribution pattern of the main beam in the reflector shape shown in FIGS. 7a and b; FIG. 9 is a plan view showing the reflection paraboloid of the reflector, which is the main part of another embodiment of the present invention; Figures 10 and 11
The figure shows the longitudinal cross-sectional shape of the reflector, and the cross-sectional views taken along lines - and XI-XI shown in Figure 9, respectively. Figures 12 and 13 show the light distribution patterns of the sub beam and main beam by the reflector. 14 is a front view showing a reflective paraboloid of a reflector which is a main part of another embodiment of the present invention, FIG. 15 is a sectional view taken along the line shown in FIG. 14, and FIG. FIG. 9 and FIG. 14 are perspective views of essential parts of a shade member used in the reflector, FIG. 17 is a perspective view of essential parts of yet another embodiment of the shade member, and FIGS. 18 and 19 are respectively Figures 20a to 20b are diagrams showing other embodiments of the member sliding mechanism, and Figures 20a and 20b are diagrams showing the positional relationship between the reflector and the discharge bulb light emitting section, respectively.
Figures 1 a to c are diagrams showing the light distribution patterns of the main beam in each case shown in Figures 20 a to c, and Figures 22 a to c are diagrams showing the light distribution of the sub beams in each case shown in Figures 20 a to b. It is a figure showing a pattern. DESCRIPTION OF SYMBOLS 10... Lamp body, 12... Reflector, 20... Discharge bulb, 21... Discharge part, 30...
...shade member, 32...shade body, 12A
... Upper reflecting paraboloid, 12B... Lower reflecting paraboloid, P ₁ ... Focal position of upper reflecting paraboloid, P ₂ , P
₃ ... Focal position of the lower reflective paraboloid.

Claims

[Claims for Utility Model Registration] (1) A parabolic reflector formed within a lamp body, a discharge bulb arranged so that a discharge portion serving as a light emission source is located near the focal point of the reflector; A headlamp for an automobile, characterized in that the shade member is provided in front of the reflector so as to be slidable in the optical axis direction, and forms a sub-beam by blocking part of the light directed from the discharge part of the discharge bulb toward the reflector. (2) The reflector is formed of an upper reflecting paraboloid for the sub and main beams and a lower reflecting paraboloid for the main beam, both of which have the same focal length, and the upper reflecting paraboloid is located closer to the rear end of the discharge section. The lower reflecting paraboloid is a reflecting paraboloid with a focal point located slightly backward, and the lower reflecting paraboloid moves the paraboloid in parallel forward in the optical axis direction to place a focal point between the rear end and the center of the discharge part. 2. The automobile headlamp according to claim 1, wherein the headlamp has a reflective paraboloid shape. (3) The reflector is formed of an upper reflecting paraboloid for sub and main beams, and a lower reflecting paraboloid for the main beam having a focal length shorter than the focal length of the upper reflecting paraboloid, and The reflective paraboloid is a reflective paraboloid whose focal point is located slightly behind the rear end of the discharge part, and the lower reflective paraboloid is a paraboloid that is translated forward in the optical axis direction. 2. The automobile headlamp according to claim 1, wherein the headlamp is a reflective paraboloid whose focal point is located between the rear end and the center of the discharge portion.