The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 15, 1989
Filed:
Aug. 31, 1987
Saburo Watanabe, Shizuoka, JP;
Koito Seisakusho Co., Ltd., Tokyo, JP;
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.