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:
Jun. 11, 1991
Filed:
Nov. 28, 1988
Aki Ueda, Yokohama, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An optical disc system typically includes an optical disc and an optical pick-up for projecting a light beam for recording information. The optical pick-up or at least its objective lens is provided to be movable relative to the optical disc in a predetermined direction. The optical pick-up uses two light beams, one of which is for recording information on the disc and the other of which is for reproducing the information recorded on the disc immediately after it has been recorded for confirmation. In accordance with the present invention, it is so structured that a tracking error of the confirmation light beam on the disc is monitored and the light intensity of the confirmation light beam emitted from the light source is varied in accordance with the detected tracking error of the confirmation light beam on the disc.