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:
Aug. 26, 2003
Filed:
Mar. 22, 2001
Byung-in Ma, Suwon, KR;
Chong-sam Chung, Suwon, KR;
In-sik Park, Suwon, KR;
Byoung-ho Choi, Suwon, KR;
Tae-yong Doh, Suwon, KR;
Samsung Electronics Co., Ltd., Suwon, KR;
Abstract
An error signal detecting apparatus for an optical recording/reproducing apparatus, the error signal detecting apparatus including a photodetector to receive light reflected and diffracted by a recording medium, and a signal processor to detect an error signal by calculating a detection signal of the photodetector. The photodetector includes a plurality of light receiving areas to independently receive light of a light area in which the profile of the light changes to the opposite profile according to the tangential tilt of the recording medium. The signal processor detects a tangential tilt error signal from detection signals of the light receiving areas. Thus, a signal output from the error signal detecting apparatus does not change when a shift is generated in the objective lens or the distance between the objective lens and the disc is deviated from the on-focus position. Also, a change in the profile of the light beam according to a relative tangential tilt with respect to the objective lens of a recording medium in land/groove format can be properly detected so that an accurate tangential tilt error signal can be detected.