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. 21, 2008
Filed:
Mar. 01, 2005
Takayuki Nomoto, Saitama, JP;
Hiroshi Nishiwaki, Saitama, JP;
Takayuki Nomoto, Saitama, JP;
Hiroshi Nishiwaki, Saitama, JP;
Pioneer Corporation, Tokyo, JP;
Abstract
A detection signal Soutputted from a light reception unit (A) of detection elements () formed by four-division light reception element is added to a detection signal Soutputted from a light reception unit (D) so as to obtain an addition signal Sand a phase difference signal Pindicating the phase difference between the addition signal Sand the detection signal SFurthermore, a phase difference signal Pindicating the phase difference between the addition signal Sand the detection signal Sis obtained. The phase difference signal Pis subtracted from the phase difference signal Pso as to generate a tracking error signal TE