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:
Sep. 13, 1994
Filed:
Nov. 18, 1993
Osamu Koyama, Kawasaki, JP;
Tadashi Kato, Kawasaki, JP;
Masayuki Usui, Yokohama, JP;
Yoshihiko Watanabe, Yokohama, JP;
Hisatoshi Baba, Yokohama, JP;
Hirotake Ando, Tokyo, JP;
Hideo Nakajima, Yokohama, JP;
Shinji Sakai, Yokohama, JP;
Kenji Tamaki, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An optical information processing apparatus includes a light source for radiating a light beam onto an optical information recording medium. A first photosensor is provided for partially receiving the light beam emitted from the light source and generating an output, and a second photosensor is provided for receiving either a light beam reflected by the recording medium or a light beam transmitted through the recording medium and generating an output. A control circuit controls power of the light beam emitted from the light source using the output from the first photosensor, and a correction circuit automatically corrects linearity of the output of the first photosensor with respect to the power of the light beam emitted from the light source in accordance with the output from the second photosensor.