发明名称 |
Vehicle headlamp |
摘要 |
A vehicle headlamp for producing a Z-beam pattern has a reflector provided with a reflective area lying on a surface defined by rotating an ellipse about an axis which passes through the inner focus of the ellipse and which is inclined an acute angle (1 DEG -2 DEG ) to the focal axis of the ellipse. A shielded filament for producing an inclined cut-off line to the beam is used and is orientated in the opposite sense to that in which it is orientated in a conventional headlamp for producing an inclined cut-off. Lensing at the front of the reflector splits the area of the basic beam pattern immediately below a horizontal portion of the cut-off line into parts which define upper and lower, mutually laterally displaced horizontal cut-off portions in the required Z-beam pattern. The lensing also utilizes a part-circular cut-off portion of the basic beam produced by the reflector and bulb to define an inclined portion of the Z-beam and depress and/or shifts other portions of the basic beam to reinforce other portions of the Z-beam.
|
申请公布号 |
US4246631(A) |
申请公布日期 |
1981.01.20 |
申请号 |
US19790039008 |
申请日期 |
1979.05.14 |
申请人 |
LUCAS INDUSTRIES LIMITED |
发明人 |
DRAPER, GEOFFREY R.;BIRT, DAVID A. |
分类号 |
F21S8/10;F21V5/00;F21V7/00;F21V7/08;F21V13/00;F21V14/02;F21V14/06;F21W101/10;(IPC1-7):F21V7/00 |
主分类号 |
F21S8/10 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|