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:
Dec. 15, 2009
Filed:
Feb. 17, 2006
Katsuhiro Oyama, Gunma, JP;
Yoshikazu Sato, Gunma, JP;
Tetsuharu Kubo, Gunma, JP;
Ryuichi Sunagawa, Gunma, JP;
Katsuhiro Oyama, Gunma, JP;
Yoshikazu Sato, Gunma, JP;
Tetsuharu Kubo, Gunma, JP;
Ryuichi Sunagawa, Gunma, JP;
Taiyo Yuden Co., Ltd., Tokyo, JP;
Abstract
An optical information recording apparatus corrects a recording condition for an optical medium having a difference in recording property between the inner and outer peripheries in real time. The optical information recording apparatus obtains an RF signal by using a playback sub beam and retrieves a portion of the RF signal corresponding to a constant output zone of a recording pulse using a gate signal. An average value of the retrieved signal is computed so as to set a reference position in real time. A difference between the top peak value of the retrieved signal and the average value and a difference between the bottom peak value of the retrieved signal and the average value are computed so as to obtain a β value in real time from the on-and-off RF signal affected by the recording pulse that turns on and off.