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:
Apr. 17, 2012
Filed:
Oct. 17, 2006
Tomoya Hoshi, Fujisawa, JP;
Atsushi Yamada, Saitama, JP;
Tooru Kawashima, Funabashi, JP;
Mitsuhiro Nishidate, Sagamihara, JP;
Tsuyoshi Toda, Kodaira, JP;
Koichiro Nishimura, Yokohama, JP;
Tomoya Hoshi, Fujisawa, JP;
Atsushi Yamada, Saitama, JP;
Tooru Kawashima, Funabashi, JP;
Mitsuhiro Nishidate, Sagamihara, JP;
Tsuyoshi Toda, Kodaira, JP;
Koichiro Nishimura, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi-LG Data Storage, Inc., Tokyo, JP;
Abstract
It is to provide an optical disc recording apparatus and a recording power control method that are adapted to high-speed recording and can set an optimal erasing power with high accuracy. A test writing signal detector reproduces a test writing signal of a predetermined mark length or space length with varied power, and detects the number of error mark signals and an amplitude value of an envelope. A controller obtains a first threshold Peof the erasing power based on the number of error mark signals in a region where laser power is low, and obtains a second threshold Peof the erasing power based on the amplitude value in a region where the laser power is high. Then, the controller sets an optimal value of the erasing power from an average value of the first and second thresholds.