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. 08, 2002
Filed:
Jan. 31, 2002
Hiroki Akaoka, Iwata-gun, JP;
Mineba Co., Ltd., Kitasaku-Gun, JP;
Abstract
In a spread illuminating apparatus including a transparent substrate which has a light reflection pattern with grooves formed to be inclined with respect to an optical axis of a light source, an optical path conversion means comprising grooves and flat portions is formed on a side surface of a light conductive member, where the depth of the grooves increases in proportion to the increase in distance from either of spot-like light sources toward a deepest groove formed at a predetermined position. The deepest groove is formed at a position off the center of the light conductive member by a predetermined distance toward either of the spot-like light sources, whereby the distribution of the amount of light emitted from the light conductive member toward the transparent substrate can be appropriately modified so as to level off the unevenness in brightness on the screen.