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:
Nov. 04, 2008
Filed:
May. 26, 2005
Tomo Kishigami, Tokyo, JP;
Yoshihiro Kiyose, Tokyo, JP;
Nobuo Takeshita, Tokyo, JP;
Toru Yoshihara, Tokyo, JP;
Masaharu Ogawa, Tokyo, JP;
Tomo Kishigami, Tokyo, JP;
Yoshihiro Kiyose, Tokyo, JP;
Nobuo Takeshita, Tokyo, JP;
Toru Yoshihara, Tokyo, JP;
Masaharu Ogawa, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
An optical disc on which information can be recorded by recording light has a first recording layer () and a second recording layer () disposed behind the first recording layer as viewed by the recording light; the first recording layer and the second recording layer have respective power adjustment areas (P, P) that are used to adjust the power of the recording light to the optimal recording power at the time of recording of information on each recording layer; a prewrite area (PW) is provided in correspondence to the power adjustment area (P) used for optimal power adjustment in the second recording layer and restricted areas (A, A) on both sides of that power adjustment area (P). The restricted areas (A, A) allow for the diameter of the recording light beam and for lamination misalignment. This configuration enables stable test recording to be carried out in a short time on an optical disc having multiple recording layers.