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:
Oct. 16, 2012
Filed:
Oct. 12, 2007
Koichiro Nishimura, Ebina, JP;
Masaaki Kurebayashi, Ebina, JP;
Tsuyoshi Toda, Kodaira, JP;
Hiroyuki Minemura, Kokubunji, JP;
Koichiro Nishimura, Ebina, JP;
Masaaki Kurebayashi, Ebina, JP;
Tsuyoshi Toda, Kodaira, JP;
Hiroyuki Minemura, Kokubunji, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Recording parameters are decided so that the time control information on at least the front edge and the rear edge of a parameter forming a mark of twice size or above of the laser spot diameter focused on the recording medium is substantially proportional to the recording linear velocity. The mark is recorded and reproduced at a predetermined linear velocity to obtain an electric signal waveform having a time width Tm. A parameter is decided so as to control the laser pulse for recording information so that a voltage value change amount at two points at a distance Ts (Ts<Tm/2) in the time axis direction before and after the time position Tm/2 from the front edge of the waveform is substantially constant for the recording linear velocity change. Identification information indicating the parameter is described on the recording medium.