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:
May. 26, 2004
Hideaki Sasaki, Gunma, JP;
Hideaki Sasaki, Gunma, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
An offset adjusting circuit for an optical disc comprises a plurality of offset-adjustment differential operational amplifiers, each of the amplifiers having an input terminal to which an output signal of an optical pickup is input and another input terminal to which a control voltage is applied, an adding circuit that adds output signals of the offset-adjustment differential operational amplifiers, an A/D converter that outputs a digital signal based on an output signal of the adding circuit, and a control voltage adjuster that varies the control voltage applied to the offset-adjustment differential operational amplifiers based on the digital signal so as to remove an offset.