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. 20, 1991
Filed:
Jun. 30, 1989
Kiyonobu Endo, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An information recording and/or reproducing apparatus in which a beam emitted from a light source is applied to an optical recording medium to thereby record and/or reproduce information thereon has a light projecting device for projecting a medium-detecting-light flux onto the surface of the optical recording medium, a discriminating device for detecting the level of the reflected light or the transmitted light of the medium-detecting-light flux from the optical recording medium and discriminating between optical recording mediums different in characteristic by the detected level, and an intensity changing device for changing the intensity of the beam on the surface of the optical recording medium in accordance with the determination of the discriminating device.