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:
Apr. 23, 1991
Filed:
Aug. 29, 1989
Masahiko Enari, Yokohama, JP;
Satoshi Shikichi, Tokyo, JP;
Fumiaki Kawaguchi, Tokyo, JP;
Kenichi Suzuki, Yokohama, JP;
Masayuki Usui, Yokohama, JP;
Hiroshi Matsuoka, Kawasaki, JP;
Kazuhiko Matsuoka, Yokohama, JP;
Hideki Hosoya, Yokohama, JP;
Akio Aoki, Tokyo, JP;
Kazuo Minoura, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
There is disclosed an optical card recorder-reader, in which erroneous signal recording, caused by a low-level light beam when it is stopped at a position for a prolonged period between writing and/or reading operation, either by interruping the irradiation, or by reducing the power of irradiation, or by placing the light beam outside the recording area, when the recording or reading operation is not in progress.