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:
Mar. 13, 1990
Filed:
Nov. 09, 1988
Yutaka Fukuda, Tokorozawa-shi, Saitama-ken, JP;
Koji Minagawa, Chiba-shi, Chiba-ken, JP;
Hiroichi Nabeshima, Hidakamachi, Iruma-gun, Saitama-ken, JP;
Koichiro Muneki, Hino-shi, Tokyo, JP;
Yoshikatsu Asano, Shiki-shi, Saitama-ken, JP;
Kazuo Aoki, Hachiohji-shi, Tokyo, JP;
Yutaka Ishizaka, Setagaya-ku, Tokyo, JP;
Other;
Abstract
A method and apparatus for determining or adjusting a projecting direction of a light beam emitted from an automobile headlight is provided. In a first aspect of the present invention, the peripheral region of a light beam is used in determining its projecting direction. In particular, a region definable in a light pattern of the projected beam having a proportionality relation between log S and I, where S indicates the value of an area having light intensity I or above, is determined and its outer contour or any predetermined point in the contour is used in determining the projecting direction. In a second aspect, apparatus for determining a projecting direction of a light beam emitted from an automobile headlight includes an indicator which automatically indicates a predetermined position of a light pattern of the light beam projected. In a third aspect, there is provided a system for automatically adjusting a projecting direction of a light beam if it deviates from a predetermined direction using a motor engageable with a mounting structure of the headlight.