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:
Dec. 07, 1993
Filed:
Feb. 25, 1993
Applicant:
Inventors:
Makoto Tachikawa, Hitachi, JP;
Noboru Azusawa, Katsuta, JP;
Tadahiko Hashimoto, Katsuta, JP;
Kuniyuki Igari, Hitachi, JP;
Toru Ishikawa, Hitachiohta, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02F / ;
U.S. Cl.
CPC ...
359 43 ; 359 40 ; 359 86 ; 345 10 ;
Abstract
The liquid crystal is written with a laser beam. The laser beam generated by a laser source is applied through an optical control unit such as galvanometer mirrors to the liquid crystal. To erase a part of the data written in the previous time completely, the liquid crystal is irradiated with the laser beam slightly wider than the portion that was thermally written on the liquid crystal in the previous time.