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:
Aug. 23, 1988
Filed:
May. 13, 1987
Applicant:
Inventors:
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01J / ;
U.S. Cl.
CPC ...
250205 ; 350401 ;
Abstract
An optical information system includes an optical source emitting light. An information recording member is exposed to the emitted light. A beam splitter disposed between the light emitting source and the information recording member separates light reflected by the information recording member and light traveling from the light emitting source to the information recording member. A device detects intensity of the separated reflected light. A birefringence plate is movably disposed between the light emitting source and the information recording member. The birefringence plate is moved in accordance with the detected intensity of the separated reflected light.