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:
Feb. 03, 2009
Filed:
Jun. 02, 2005
Shingo Harada, Kanagawa, JP;
Shingo Harada, Kanagawa, JP;
Sony Corporation, , JP;
Abstract
A tracking error detector receives laser light that is irradiated onto tracks on a disc surface and that is reflected from the tracks by using a light-receiving device having divided portions, binarizes signals output from the light-receiving device having divided portions in accordance with the amount of tracking error by using a signal processing circuit including a binarization circuit, and outputs a tracking error signal for tracking control on the basis of a phase difference between the binarized signals. The tracking error detector includes an inter-signal amplitude difference adjustment circuit for determining an amplitude difference between signals output from the light-receiving device, for adjusting the amplitude difference between the signals, the amplitude difference being binarized by the signal processing circuit, for equalizing the phase offset of each of the signals, and for suppressing the phase offset with respect to the tracking error signal.