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. 24, 2008
Filed:
Feb. 09, 2005
Teruaki Sogawa, Osaka, JP;
Nobuyuki Kimura, Osaka, JP;
Takayuki Murakami, Osaka, JP;
Katsuichi Inoue, Osaka, JP;
Teruaki Sogawa, Osaka, JP;
Nobuyuki Kimura, Osaka, JP;
Takayuki Murakami, Osaka, JP;
Katsuichi Inoue, Osaka, JP;
Funai Electric Co., Ltd., Osaka, JP;
Abstract
In a processing section, allowable gain-value range defining unitmeasures a gain value k corresponding to a level ratio between an MPP signal and an SPP signal generated by a tracking error signal generating circuitto define an allowable range of the gain value, and eccentricity measuring unitmeasures an eccentricity of an optical disk. If the eccentricity is determined to be greater than or equal to a predetermined value by eccentricity determining unit, gain-value defining unitselects a minimum value of the gain value k to define the minimum value as a gain value k of an amplifier. On the other hand, if the eccentricity is determined to be less than the predetermined value, the gain-value defining unitselects a central value of the gain value k to define the central value as the gain value k of the amplifier