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:
Sep. 07, 2004
Filed:
Sep. 13, 2002
Applicant:
Inventor:
Shingo Suzuki, Iwata-gun, JP;
Assignee:
Minebea Co., Ltd., Kitasaku-gun, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F21V 8/00 ; F21V 7/04 ;
U.S. Cl.
CPC ...
F21V 8/00 ; F21V 7/04 ;
Abstract
In a light reflection pattern formed on a bottom surface of a light conductive plate, an inclined surface of grooves positioned at a predetermined distance or farther from a lamp includes a non-flat portion whose inclination angle varies gradually. Light rays traveling in the light conductive plate are reflected at the non-flat portion with an appropriate angle suitable for increasing a viewing field angle and exit out from a top surface of the light conductive plate. Consequently, the viewing field angle at the portion positioned at a predetermined distance or farther from the lamp can be increased.