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:
Jun. 11, 2013
Filed:
May. 16, 2012
Futoshi Takeda, Osaka, JP;
Futoshi Takeda, Osaka, JP;
Funai Electric Co., Ltd., Osaka, JP;
Abstract
Even when a first differentiation value is equal to or greater than a first threshold value, this optical disc device does not confirm 'CD' to be the differentiation result, as long as a first focus error signal FEor a first focus sum signal FSis less than a second threshold value; and even when the first differentiation value is equal to or greater than a second differentiation value, this optical disc device does not confirm 'CD' to be the differentiation result, as long as the signal FEis less than a second focus error signal FE, or as long as the signal FSis less than a second focus sum signal FS. The signals FEand FSare obtained when a CD laser beam is directed onto an optical disc. The signals FEand FSare obtained when a DVD laser beam is directed onto the disc.