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:
Oct. 19, 2004
Filed:
Sep. 17, 2002
Yasuyuki Amano, Shizuoka, JP;
Koito Manufacturing Co., Ltd., Tokyo, JP;
Abstract
A vehicular lamp radiating light emitted by LED light sources through indirect illumination and having uniform brightness. Light from LED light sources is directed upward into parallel beams by Fresnel lenses. The parallel beams are reflected in a frontward direction. A reflector is divided into sub reflectors that differ in height and angle of forward inclination The distance between each LED light source and a corresponding Fresnel lens increases in proportion to a decrease in height of a corresponding sub reflectors, and the intensity of the luminous flux impinging on each Fresnel lens decreases in proportion to a decrease in height of a corresponding sub reflectors. The intensity of luminous flux impinging on each sub reflectors decreases in proportion to a decrease in projected area in a forward direction of the lamp. The sub reflectors have uniform luminance and the entire reflecting surface appears uniform in brightness.