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:
May. 15, 2007
Filed:
Dec. 12, 2003
Rie Takahashi, Hirakata, JP;
Takeharu Yamamoto, Takatsuki, JP;
Takashi Kishimoto, Nara, JP;
Kenji Fujiune, Takatsuki, JP;
Katsuya Watanabe, Nara, JP;
Rie Takahashi, Hirakata, JP;
Takeharu Yamamoto, Takatsuki, JP;
Takashi Kishimoto, Nara, JP;
Kenji Fujiune, Takatsuki, JP;
Katsuya Watanabe, Nara, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An optical disc drive is used to read and/or write data from/on an optical disc having a data storage layer. The drive corrects electrical offset while reading and/or writing data. The drive updates a correction value based on an electrical offset detected at correcting operation or a value derived using electrical offset values that has been detected and stored, without detecting an electrical offset at correcting operation. Therefore, the optical disc drive can correct the electrical offset less often.