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:
Mar. 08, 1994
Filed:
Jul. 12, 1993
Takao Rokutan, Higashimurayama, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
In a track control circuit for an optical car recording/reproducing apparatus, a light beam for optically recording or reproducing information is incident on a desired track of an optical card having a plurality of tracks through a focusing lens. A beam reflected by a desired track of the optical card is detected by a photosensor, and a track error signal is generated as a signal representing a deviation of the reflected beam. A track actuator moves the focusing lens in horizontal and vertical directions so as to position the focusing lens on the track of the optical card in accordance with a track error signal gain-controlled by a variable gain amplifier. The variable gain amplifier receives a control signal from a CPU so as to change the gain of the track error signal in accordance with the amplitude of the generated track error signal.