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:
Mar. 13, 2007
Filed:
May. 04, 2004
Applicants:
Akihiro Shibata, Takatsuki, JP;
Dai Ichiryu, Hirakata, JP;
Takamasa Sakai, Ibaraki, JP;
Inventors:
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 7/00 (2006.01); G11B 5/09 (2006.01);
U.S. Cl.
CPC ...
Abstract
In a land pre-pit address demodulating device DM for detecting land pre-pit address information during recording to a DVD-R/RW-disc, a tracking error signal TE is muted by a first reference potential Vduring a period in which the tracking error signal TE is generated from a reflected laser beam having a power for recording a mark, an RF residual component is removed from the tracking error signal TE, and the tracking error signal TE from which the RF residual component has been removed is compared with a second reference potential V, thereby detecting a land pre-pit address signal.