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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.:

US 5064276 B1

PDFFull Text
Date of Patent:
Nov. 12, 1991

Filed:

Jun. 30, 1989

Light source for planar illumination in liquid crystal device

Applicant:
Inventors:

Syuusuke Endo, Mobara, JP;

Naofumi Aoyama, Mobara, JP;

Toshihiko Yabuuchi, Mobara, JP;

Teruo Seki, Mobara, JP;

Assignee:

Hitachi, Ltd., Tokyo, JP;

Attorney:

Antonelli, Terry, Stout & Kraus

Primary Examiner:

Rolf Hille

Assistant Examiner:

S V Clark

Int. Cl.
CPC ...
G02F / ; F21V / ;
U.S. Cl.
CPC ...
359 49 ; 362 31 ; 362347 ;
Abstract

A light source device disposing light sources at both end faces of the transparent plate in which a surface of the transparent plate in the side of an observer (front surface) is formed as the inclined and curved surface in view of limiting reduction in quantity of light per unit area at the observing area being far from the light source within a certain level, the one surface of the transparent plate is formed as the rough surface to diffuse the incident light, the other surface of the transparent plate is formed as a mirror-surface, and a reflecting layer having a high lightness is disposed at the lower side of the transparent plate in order to provide sufficient luminance for observers.

Find Patent Forward Citations

Endo, Syuusuke. (1991). Light source for planar illumination in liquid crystal device (U.S. Patent No. 5064276). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5064276

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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