Apparatus for reading a disk-shaped optical record carrier

Details Apparatus for reading a disk-shaped optical record carrier Apparatus for reading a disk-shaped optical record carrier

G - Physics

11

B

352/32.2

G11B 7/085 (2006.01) H04N 5/76 (2006.01) H04N 5/85 (2006.01)

Patent

CA 1235498

16 ABSTRACT: Apparatus for reading a disk-shaped optical record carrier. The invention relates to an apparatus for reading an optical record carrier. During a search mode an optical read unit is rapidly moved in a radial direction. By means of a control circuit a servo control loop is rendered operative and inoperative in accordance with a predetermined periodic pattern. By means of a deflection element in the optical read unit said servo control loop controls the scanning position of the read spot on the record carrier. During a fast search operation the control circuit defines the operative period of the servo control loop in such a way that the address signals recorded in the vertical fly- back periods of the video signal are read with a high reliability.

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