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:
Oct. 02, 2007
Filed:
Mar. 22, 2004
Katsuya Watanabe, Nara, JP;
Takashi Kishimoto, Nara, JP;
Rie Takahashi, Osaka, JP;
Masayoshi Shioya, Itami, JP;
Katsuya Watanabe, Nara, JP;
Takashi Kishimoto, Nara, JP;
Rie Takahashi, Osaka, JP;
Masayoshi Shioya, Itami, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A method for recognizing at least two types of optical discs, which are associated with multiple different numerical apertures, includes the step of setting the numerical aperture of a focusing mechanism equal to a first one of the multiple different numerical apertures. The focusing mechanism is used to focus a light beam on a data storage layer of a given optical disc. The first numerical aperture is smaller than any of the other numerical apertures. The method further includes the step of recognizing the type of the given optical disc by the first numerical aperture that has been selected in the step of setting the numerical aperture.