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. 18, 1996
Filed:
May. 16, 1995
Yasuhiro Koike, Yokohama, JP;
Kayoko Watai, Hasuda, JP;
Enplas Corporation, Kawaguchi, JP;
Abstract
A corner supply type plane light source device having a simple structure and capable of forming a uniform luminescent part with a small power consumption is disclosed. The corner supply type plane light source device comprises a flat-plate light-scattering light guide 1, diffusion reflective sheets 2, 4, and LEDs 3 disposed at corners. The light-scattering light guide 1 is composed of a material provided with a uniform scattering power, and the effective scattering irradiation parameter E and the correlation distance a satisfy the conditions of 9.ltoreq.E[cm.sup.-1 ].ltoreq.100 and 0.06.ltoreq.a[.mu.m].ltoreq.35. Turning on the LEDs 3, light is supplied from each corner. The LED radiation light having directivity immediately undergoes the scattering in the light-scattering light guide 1 and the propagation direction is expanded in the lateral and vertical directions, and also undergoes the internal reflection on the bottom 12 and sides 13, and diffusion reflection by the diffusion reflective sheets 2, 4. As a result, the light propagates throughout the entire light-scattering light guide 1. The light surpassing the critical conditions on the light exit surface 11 through this process is emitted from the light exit surface 11 to provide a light flux F. (Representative drawing) FIG. 4