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. 05, 2002
Filed:
Mar. 02, 1999
Gea-ok Cho, Suwon, KR;
Chun-sup Kim, Suwon, KR;
Samsung Electronics Co., Ltd., Suwon, KR;
Abstract
An apparatus and method for adaptively generating a tracking error signal according to a phase error generated due to a nonuniform depth of pits formed in an optical disk. The apparatus includes a first adder to output a first added signal (A+C) among optical detection signals A, B, C and D output by four elements for detecting light beams reflected from the optical disk, a second adder to output a second added signal (B+D) among the optical detection signals A, B, C and D, a multiplexer to receive the optical detection signals A, B, C and D, the first added signal (A+C), and the second added signal (B+D), and to select and output the signals (A+C) and (B+D), A and B, or C and D, a phase detector to determine a difference between the two signals output by the multiplexer, and output the difference as a tracking error signal and determine whether the tracking error signal is normal, and a selection controller to control selection of the multiplexer according to the result of the determination of the phase detector. Therefore, an optimal tracking error signal is obtained by selecting appropriate optical detection signals according to the phase error between the selected optical detection signals.