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:
Feb. 01, 2005
Filed:
Aug. 08, 2002
Shigeki Yamazaki, Hitachinaka, JP;
Hiroyuki Minamura, Kokubunji, JP;
Hisataka Sugiyama, Kodaira, JP;
Tetsuya Fushimi, Hitachinaka, JP;
Makoto Itagaki, Yokohama, JP;
Shigeki Yamazaki, Hitachinaka, JP;
Hiroyuki Minamura, Kokubunji, JP;
Hisataka Sugiyama, Kodaira, JP;
Tetsuya Fushimi, Hitachinaka, JP;
Makoto Itagaki, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Softwear Engineering Co., Ltd., Yokohama, JP;
Abstract
An optical disc apparatus and method for recording and reproducing information to/from an optical disc, including discrimination of the optical disc, reading control information in an un-recordable area formed in an inner periphery of the optical disc, conducting focus control based on a focus error signal in a recordable area formed outside of the un-recordable area, and determining an optimum offset value of the focus error signal in the recordable area. Further, adjustment in amplitude of a reproduced signal from an inner periphery of the recordable area is conducted, test-writing in the inner periphery of the recordable area is conducted, test-writing in an outer periphery of the recordable area is conducted, and adjustment in amplitude of a reproduced signal from the outer periphery of the recordable area is conducted. The respective operations are conducted sequentially so as to make the optical disc in a reproducible and recordable condition.