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:
Jul. 23, 2002
Filed:
Aug. 11, 1997
Makoto Kawamura, Kanagawa, JP;
Yoshiyuki Akiyama, Kanagawa, JP;
Yasushi Fujinami, Kanagawa, JP;
Jun Yonemitsu, Kanagawa, JP;
Tomihiro Nakagawa, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
High-speed access to a multi-layered disk is to be realized. Each layer on a multi-layered disk includes an inside guard area , program area , and outer guard area which are located in uniform radial positions in all layers. The uppermost layer has the recording direction from the inner side to the outer side of the disk, and the next layer has the recording direction from the outer side to the inner side of the disk such that opposite recording directions appear alternately. The radial position of the recording terminal end on the uppermost first layer coincides with the radial position of the start of record on the next second layer.