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. 16, 1992
Filed:
Sep. 04, 1991
Applicant:
Inventors:
Kiyoshi Iizuka, Yokohama, JP;
Masahiro Fushimi, Yokohama, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02F / ; G02F / ; G02F / ;
U.S. Cl.
CPC ...
359 54 ; 359 79 ; 359 89 ; 359 94 ; 359 95 ;
Abstract
A focusing plate comprising two base plates, a liquid crystal layer held between the two base plates, and an electrode pattern which is formed on each of the two base plates for the purpose of rotating the liquid crystal molecules in the liquid crystal layer by applying an electrical field to the liquid crystal layer; the electrode pattern being so formed that, when the electrical field is applied, the liquid crystal molecules are rotated by the leakage electrical fields from the electrode pattern to form a phase-type diffraction grating in the liquid crystal layer.