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. 19, 2010
Filed:
Jun. 01, 2007
Katsuhiro Oyama, Gunma, JP;
Mitsuo Sekiguchi, Gunma, JP;
Hiroya Kakimoto, Gunma, JP;
Fuyuki Miyazawa, Gunma, JP;
Katsuhiro Oyama, Gunma, JP;
Mitsuo Sekiguchi, Gunma, JP;
Hiroya Kakimoto, Gunma, JP;
Fuyuki Miyazawa, Gunma, JP;
Taiyo Yuden Co., Ltd., Tokyo, JP;
Abstract
An optical information recording reproduction device is disclosed which finds the correlation between the ratio of the minimum pit amplitude to the maximum pit amplitude of an RF signal obtained from the light reflected by the pits recorded on an optical disk in a tracking servo mode and spherical aberration in advance, and stores it. In recoding information on the optical disk, the optical information recording reproduction device calculates the ratio of the minimum pit amplitude to the maximum pit amplitude of the RF signal, and compares the calculation to the stored correlation, and feeds back to an aberration correction optical system and a driving mechanical system to correct the aberration into an aplanatic state.