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:
Nov. 06, 2007
Filed:
Aug. 01, 2006
Yasuyuki Amano, Shizuoka, JP;
Tsutomu Machida, Shizuoka, JP;
Yasuyuki Amano, Shizuoka, JP;
Tsutomu Machida, Shizuoka, JP;
Koito Manufacturing Co., Ltd., Tokyo, JP;
Abstract
A vehicular lamp including a light-emitting elementthat emits light at a greater diffusion angle in the lateral direction than in the vertical direction, thus enabling the light to be incident on the rear faceof a horizontally elongated inner lenswith high efficiency. The rear facehas a cylindrical surface that extends in the lateral direction, and the curvature of a convex curve, which forms the cross-sectional shape of the cylindrical surface taken along the vertical plane parallel to the optical axis Ax, gradually reduces according to the increase in the distance from the optical axis Ax in the lateral direction, thus allowing the curvature of the convex curve to be maintained at a substantially constant value in the lateral direction and further preventing the diffusion angle of the light into the lens in the vertical direction from increasing in the lateral direction.