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:
Sep. 16, 2008
Filed:
Nov. 16, 2004
Motoyasu Terao, Hinode, JP;
Harukazu Miyamoto, Higashimurayama, JP;
Toshimichi Shintani, Kodaira, JP;
Kyoko Kojima, Kunitachi, JP;
Yuko Tsuchiya, Tokorozawa, JP;
Motoyasu Terao, Hinode, JP;
Harukazu Miyamoto, Higashimurayama, JP;
Toshimichi Shintani, Kodaira, JP;
Kyoko Kojima, Kunitachi, JP;
Yuko Tsuchiya, Tokorozawa, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Disclosed herewith is a method for enabling fast and high density recording of information. A voltage is applied to a recording layer formed between a pair of electrodes. The distance between the pair of electrodes is set wider at one of land and groove areas of a subject optical disk and narrower at the other or the distance is set so that light absorption occurs only in either of the land and groove areas. The optical disk is also provided with a layer of which light absorption spectrum changes according to the application of an electric current, thereby absorbing the light. The new layer may be the recording layer itself or a layer adjacent to the recording layer. Because a heat generates only from a small area of the optical disk at the time of recording, the disk can be turned rapidly and permissively to the auto focusing and tracking offsets, thereby enabling fast and high density recording. The disk can thus be formed with easily selectable multiple layers.