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:
Jun. 01, 2010
Filed:
Aug. 23, 2005
Kenji Kusano, Tochigi, JP;
Masahiko Hayashi, Tokyo, JP;
Keisuke Tsukada, Tokyo, JP;
Yasunori Takahashi, Tokyo, JP;
Kenji Kusano, Tochigi, JP;
Masahiko Hayashi, Tokyo, JP;
Keisuke Tsukada, Tokyo, JP;
Yasunori Takahashi, Tokyo, JP;
Zeon Corporation, Tokyo, JP;
Abstract
A thin direct-type backlight capable of realizing high brightness uniformity is provided by a specific configuration of the direct-type backlight whereby high light beam utilization ratio is maintained while periodical unevenness of the light emitting surface is suppressed. In a direct-type backlight device having a plurality of linear light sources in parallel, a reflection plate and a light diffusion plate, at least one of main surfaces of the light diffusion plate is provided with a prismatic ridges having a sawtooth-shaped cross-section. The apex angle 'y' (degree) of the prismatic ridge of the light diffusion plate, the distance 'a' (mm) between centers of the adjacent linear light sources, and the distance “b” (mm) from a center of the linear light sources to a surface of the light diffusion plate facing the light source satisfy the relationship of 80×(b/a)+15<y<180×(b/a)+70.