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, 1996
Filed:
Nov. 02, 1994
Toyoaki Takeuchi, Sagamihara, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
An optical information reproducing apparatus for reproducing information from an optical recording medium that has a recording and reproducing and information-rewritable track region, which is composed of a header region having information, such as a sector start mark, track number and sector number, in a pit shape formed when the recording medium has been manufactured and a recording and reproducing user data region that has no pit and enables information to be recorded and reproduced, the optical information reproducing apparatus having a semiconductor laser output control circuit for controlling a quantity of a semiconductor laser beam to be emitted to a predetermined value such that a detected quantity of an emitted semiconductor laser beam is obtained in only the user data region when the quantity of the laser beam emitted by a semiconductor laser that irradiates the recording medium with a semiconductor laser beam is detected.