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. 05, 2004
Filed:
Jan. 23, 2003
Kozo Ida, Kawasaki, JP;
Muneo Yoneda, Nagoya, JP;
Mitsubishi Rayon Co., Ltd., Tokyo, JP;
Abstract
A surface illuminant device for illuminating a short-distance observation picture plane, capable of easily being enlarged in area without inviting a non-uniformity in visibility, the device comprising a light guide ( ), a light reflection member ( ), a linear light source disposed to extend in a Y-direction along a light incident end face in a Y-Z plane of the light guide ( ), and a prism sheet ( ) for converting a light advancing direction. The light guide ( ) has a light outgoing mechanism of a fine unevenness structure for emitting from a light outgoing surface ( - ) an incident light from the linear source, and a light focusing means for acting on the light passed through the light guide ( ) and the prism sheet ( ) to allow it to leave in a focused status. The light focusing means is formed so that a prism apex angle &agr;, an inclination &bgr; with respect to a normal to the prism sheet, a change rate &ggr; of &bgr; with respect to a prism arraying direction, and a prism arraying pitch P satisfy 55 deg.≦&agr;≦75 deg., −20 deg.≦&bgr;≦+20 deg., 0.2 deg./cm≦&ggr;≦1.5 deg./cm, 10 &mgr;m ≦P≦1000 &mgr;m.