Apparatus for reading a disk-shaped record carrier

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

H - Electricity

04

N

352/32.2

H04N 5/781 (2006.01) G11B 7/085 (2006.01) G11B 7/09 (2006.01) G11B 21/08 (2006.01)

Patent

CA 1145039

23,10.78 1 PHN 9204 ABSTRACT: "Apparatus for reading a disk-shaped record carrier." An apparatus for reading a disk-shaped record carrier, the radial scanning position being controlled with the aid of a first servo control loop, which con- trols a positioning member for the read element depending on a control signal which is read from the record carrier. If this control is disturbed a second servo control loop is rendered operative. This second servo control loop com- prises a position indicator for supplying a position sig- nal which is representative of the radial position of the positioning member, a memory circuit for storing the value of this position signal at the instant of failure of the first servo control loop, and a differential amplifier for applying a control signal to the positioning member, which signal corresponds to the difference between the instantaneous and the stored value of said position sig- nal. Furthermore, there is provided a control circuit for changing-over between the first and the second servo con- trol loop and vice versa depending on a built-in criterion.

333921

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