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:
Jul. 16, 2002
Filed:
Dec. 11, 2000
Koito Manufacturing Co., Ltd., Tokyo, JP;
Abstract
A reflecting mirror, for a vehicle headlamp, which provides a sufficient amount of light near a slant cutoff line in downward-beam light distribution, thereby improving visibility in a long-distance region and a medium-distance region. The reflecting mirror has at least a first reflecting area and a second reflecting area. For a first reflecting area ( B—close to a horizontal reference face (x-y plane) when a reflecting face ( ) is viewed from an optical axis direction—a reference curve is set in a slant reference face inclined to the horizontal reference face at an angle equal to an angle (&thgr;col) of a slant cutoff line with a horizontal line. For a second reflecting area ( D, E)—positioned above or below the first reflecting area ( B) with respect to the horizontal reference face—a reference curve is set in a slant reference face inclined to the horizontal reference face at a second angle larger than 0° and smaller than the angle of the slant cutoff line with the horizontal line. Parabolas are then associated with planes orthogonal to the slant reference face, thereby forming a curved surface.