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:
Sep. 10, 2002
Filed:
Aug. 01, 2000
Masaya Kuwahara, Osaka, JP;
Shinichi Yamada, Osaka, JP;
Hiroyuki Yamaguchi, Hyogo, JP;
Masuo Maruyama, Osaka, JP;
Masanari Mohri, Hyogo, JP;
Akihiro Sakaguchi, Osaka, JP;
Yasuo Nishihara, Osaka, JP;
Masayoshi Shioya, Hyogo, JP;
Matsushita Electric Industrial Co., Ltd., Kadoma, JP;
Abstract
Optical disks compliant with different standards are recorded or reproduced by a single recording/reproducing apparatus by a first step of determining a substrate thickness of the disk based on a focusing error signal, when a focusing section for bringing the light beam into a focus on the disk is moved in such a way as to approach or withdraw from the recording surface of the disk; a second step of performing any one step of determining the number of recording surfaces of the disk when the focusing section is moved in such a way as to approach or withdraw from the recording surface of the disk, and determining whether or not the disk can be recorded and reproduced using a tracking error signal detected when the light beam crosses the track.