Single-filament headlamp unit capable of throwing both upper and

Details Single-filament headlamp unit capable of throwing both upper and Single-filament headlamp unit capable of throwing both upper and

1987-08-31

1989-08-15

Griffin, Robert L.

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Reflector

362 61, H01K 130

Patent

active

048577944

ABSTRACT:
A lamp unit having a single-filament bulb disposed at a first focus of an ellipsoidal or like reflector which has a second focus disposed farther away therefrom than is the first focus. Disposed opposite the reflector, a converging lens has its focus in the vicinity of the second focus of the reflector. A lower beam shade is also disposed adjacent the second focus of the reflector for cutting off the rays that have been reflected from the bottom half of the reflector, so that the rays reflected from the top half of the reflector are allowed to impinge on the converging lens thereby to be thrown as a lower beam. In order to enable this lamp unit to emit an upper beam of optimum intensity distribution as well, the converging lens is made tiltable, or linearly movable, upwardly to an extent necessary to permit all the rays reflected by the reflector to fall on the converging lens. The shade may be displaced downwardly in step with the upward displacement of the lens.

REFERENCES:
patent: 1389291 (1921-01-01), Bone
patent: 1660699 (1928-07-01), Wood
patent: 1928431 (1933-11-01), Morshead et al.
patent: 4432040 (1984-02-01), Matsuura et al.

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