Drive circuit for feeding a reproducing element across a rotary

Details Drive circuit for feeding a reproducing element across a rotary Drive circuit for feeding a reproducing element across a rotary

1982-01-29

1984-12-04

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

369 43, H04N 576, G11B 2110

Patent

active

044867905

ABSTRACT:
A reproducing element feeding and driving circuit is provided in a rotary recording medium reproducing apparatus consisting of a signal pickup device having a reproducing element for reproducing recorded signals from a rotary recording medium, a feeding mechanism for feeding the signal pickup device, and a tracking error signal obtaining circuit for obtaining a tracking error signal so as to perform tracking control with respect to the reproducing element. The feeding and driving circuit comprises a sampling circuit for sampling the tracking error signal when the reproducing element is reproducing a point on the rotary recording medium corresponding to one of a plurality of pairs of points on the rotary recording medium, where the pairs of points are points which are at symmetrical positions along a diametrical direction of the rotary recording medium with respect to a center of the rotary recording medium, averaging circuit for averaging a value sampled by the sampling circuit and obtaining a signal substantially corresponding to a DC component of the tracking error signal, and a feed pulse applying circuit for obtaining a feed pulse having a pulse width which is in accordance with the DC component obtained from the averaging circuit and applying the feed pulse thus obtained to the feeding mechanism.

REFERENCES:
patent: 3919697 (1975-11-01), Walker
patent: 4315283 (1982-02-01), Kinjo et al.

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