Optical disc players

Details Optical disc players Optical disc players

G - Physics

11

B

352/32.2

G11B 7/095 (2006.01) G11B 7/09 (2006.01)

Patent

CA 1206613

OPTICAL DISC PLAYERS ABSTRACT OF THE DISCLOSURE In an optical disc player in which a reading light beam is caused to impinge on an optical disc having a record track formed with an alignment of geometric variations such as a plurality of pits provided in response to information to be modulated in intensity by the record track and a photodetector is provided for detecting the reading light beam coming from the optical disc to generate an output varying in response to the variations in intensity of the detected reading light beam; there are provided first circuit means for producing a reproduced information signal having level variations representing the geometric variations and a tracking error signal which may have level variations depending on the size of each segment of the geometric variations on the strength of the output of the photodetector, second circuit means for detecting the duration of a portion corresponding to each segment of the geometric variations of the reproduced information signal or output of the photodetector and extracting selectively the level of the tracking error signal whenever the detected duration is measured within a predetermined time range so as to produce a modified tracking error signal having the extracted level, and control means for performing tracking control in relation to the reading light beam in response to the modified tracking error signal.

431828

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