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. 02, 2007
Filed:
Feb. 20, 2002
Hiromichi Ishibashi, Osaka, JP;
Katsuya Watanabe, Nara, JP;
Kenji Fujiune, Osaka, JP;
Shinichi Yamada, Osaka, JP;
Yuuichi Kuze, Osaka, JP;
Hiromichi Ishibashi, Osaka, JP;
Katsuya Watanabe, Nara, JP;
Kenji Fujiune, Osaka, JP;
Shinichi Yamada, Osaka, JP;
Yuuichi Kuze, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Kadoma, JP;
Abstract
An optical disc unitcomprises: reflective surface detection meansfor detecting a reflective surface; focus control means (and) for performing focus control to a reflective surface so that the distance between the focal point of an optical beam applied to an optical discand the reflective surface is within a predetermined error limit; shift meansfor shifting the focal point of the optical beam in a direction perpendicular to the optical disc; and control meansfor controlling the focus control means and the shift means.