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:
Apr. 16, 1993
Shinichi Ohta, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An apparatus for effecting the recording and reproduction of information on an information track on a recording medium, includes a device for applying a first light spot to the information track to thereby record information, a device for applying a second light spot to the information track to thereby reproduce the information, a device for moving the recording medium relative to the first and second light spots in the lengthwise direction of the information track, a detector for detecting a tracking signal from the reflected light of the second light spot by the recording medium, a tracking controller for moving the first and second light spots in the tracking direction orthogonal to the lengthwise direction of the information track in conformity with the tracking signal, and a device for providing to the tracking signal an offset corresponding to the positional deviation between the center of the first light spot and the center of the second light spot in the tracking direction, during the recording of the information. A method of effecting the recording and reproduction of information by the use of the apparatus described above is also provided.