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:
May. 21, 1996
Filed:
Jul. 15, 1994
Satoshi Itoi, Tokyo, JP;
Shigeru Araki, Tokyo, JP;
NEC Corporation, , JP;
Abstract
An optical disk recordable on first and second principal surfaces thereof rotates at a constant angular velocity. First and second optical heads positioned over the respective first and second principal surfaces are simultaneously moved along the same or different radiuses by a disk rotating unit for recording data on the optical disk. A head position detector is responsive to track addresses read by the first and second optical heads for outputting head position signals indicative of the distances from the center of the optical disk to the first and second optical heads. A control clock generator determines the ratio of linear velocities of tracks where the first and second optical heads are positioned, and generates control clock signals having respective bit rates depending on the linear velocity ratio. Based on the control clock signals, a data distributor distributes image data and non-image data such as audio and control data to the first and second optical heads.