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:
Jan. 26, 2010
Filed:
Feb. 15, 2005
Kiyoshi Nakamori, Osaka, JP;
Kiyoshi Nakamori, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
In a circuit for detecting a recorded area of an optical disk, when unnecessary noise is superimposed on the space portion of the digitized signal (RF) of an RF signal from the optical disk, a counter () for detecting a space portion detects the noise and resets a counter () for detecting a recorded area with an output signal Stherefrom. This prevents the counter () for detecting a recorded area from erroneously outputting a recorded area detection signal (S) due to the noise. As a result, a counter () for detecting an unrecorded area outputs an unrecorded area detection signal (S) with high accuracy to bring a recorded area signal (RECD) from a flip-flop circuit () to the L level. Accordingly, an unrecorded area can be detected as it is inherently with high accuracy without being erroneously recognized as a portion in which a mark portion has been recorded.