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. 02, 1998
Filed:
Feb. 26, 1996
Satoru Sanada, Yokohama, JP;
Nikon Corporation, Tokyo, JP;
Abstract
An optical disk playback and recording device has a control unit which alternately allocates sequential logical addresses between single or multiple continuous sectors on each side of a two-sided optical disk with disk regions divided into tracks having sectors. The device also has first and second playback and recording heads, one disposed on each side of the disk, playing back data from or recording data to sectors identified by the logical addresses of data for playback or recording. Such a device achieves increased data transmission speeds by allowing access to data occupying alternately located sectors on each side of the optical disk by both the first and second heads. The control unit also controls access to such an optical disk. Where the optical disk playback and recording device has a higher playback and recording frequency for tracks located toward the periphery of the disk, the device can achieve both uniform and increased data transmission speeds. The device has a control unit alternately allocating sequential logical addresses to a varying number of continuous sectors between sectors in tracks located toward the center of one side of the disk and sectors in tracks located toward the periphery of the other side of the disk. The control unit also controls access to such an optical disk.