Claims
- 1. A headlamp for a vehicle in which a main filament and a sub-filament are arranged in parallel to a rotational axis of a paraboloidal surface of a reflector, and the sub-filament is positioned above the main filament, wherein:
- the reflector is different in focal position of the paraboloidal surface thereof between an upper surface and a lower surface,
- the focal point on the lower surface side is positioned frontwardly more than a length of the sub-filament from the focal point on the upper surface side,
- the sub-filament is positioned between both the focal points, and
- the main filament is longer than the sub-filament and is positioned thereunder and in parallel alignment therewith to produce corresponding different illumination patterns, the main filament producing a larger illumination pattern than the sub-filament, and the illumination pattern of the sub-filament being formed on proportion to the length of the sub-filament, wherein
- the main filament is disposed so as to extend beyond the sub-filament by an interval in the range 1 to 1+L/2 such that 1 is the difference between the lengths of the main filament and the sub-filament, and L is the length of the main filament to thereby efficiently utilize luminescence to obtain a light distribution pattern of light luminous intensity and reduce the vertical dimension employed in said head lamp.
Parent Case Info
This application is a continuation of application Ser. No. 634,877, filed July 26, 1984, now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3688149 |
Pitkjaan |
Aug 1972 |
|
4140939 |
Bonazoli et al. |
Feb 1979 |
|
Foreign Referenced Citations (2)
Number |
Date |
Country |
1277850 |
Jan 1961 |
FRX |
505057 |
Dec 1954 |
ITX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
634877 |
Jul 1984 |
|