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:
Dec. 03, 1996
Filed:
Jun. 07, 1995
Akira Onodera, Kawagoe, JP;
Koichi Yamazaki, Sakado, JP;
Nippon Conlux Co., Ltd., Tokyo, JP;
Abstract
Information is recorded and reproduced by making a light beam traverse guide tracks to reach a target track. In moving the light beam to the target track, a tracking error signal is supplied to the inverting input terminal of a comparator to compare it with a potential at the non-inverting input terminal. The comparator outputs a comparison result signal to an output terminal. This output signal is fed back to the non-inverting input terminal via a feedback element so that the potential at the non-inverting input terminal changes with the output signal of the comparator. With the operation of the potential control circuit, a large feedback signal of the feedback element is used when a tracking control off signal is supplied, so that the potential at the non-inverting input terminal is easy to change with the output signal level. When the tracking control off signal is not supplied, a small feedback signal is used to change the potential at the non-inverting input terminal with the output signal level. The signal detected by the comparator is supplied to the output circuit to reference the direction control signal and generate a track traverse detecting signal.