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. 04, 1996
Filed:
Oct. 14, 1994
Takayoshi Chiba, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
An optical disc apparatus includes a rotary encoder (14) for detecting a rotation of a spindle motor (12) that rotates an optical disc (11). A counter (16) generates a timing pulse (P.sub.3) per rotation of the optical disc (11) in synchronism with an output timing pulse (P.sub.1) of the rotary encoder (14). When the timing pulse (P.sub.3) is generated, in other words, one revolution of the optical disc (11) is specified, an optical pickup (21) is returned by one track amount in an inner peripheral direction (Ri) of the optical disc (11) in synchronism therewith. Therefore, even when an optical disc is an optical disc having tracks in which a length of one track is made different from a length of physical one round, the optical pickup (21) can be maintained in a still condition (also called on-track condition).