Tracking control for a video disc player
AssigneeSharp Kabushiki Kaisha
InventorKazuo Mimasu
Life of this patent
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Abstract
A linear tracking control system for a video disc player comprising a playback transducer drive motor in addition to a turntable drive motor. A high voltage forward signal is applied to the playback transducer drive motor for performing a fast forward movement of the playback transducer. A high voltage reverse signal having a polarity opposite to the forward signal is applied to the playback transducer drive motor for achieving the fast reverse movement. A playback tracking control signal is intermittently applied to the playback transducer drive motor upon every four rounds of the turntable in order to intermittently advance the playback transducer in the playback operation.
Claims11
A disc player system comprising:
- support means for supporting a disc which carries information recorded thereon;
- first motor means for rotating said support means;
- first sensor means for detecting the number of rotations of said support means and developing an output in accordance therewith;
- playback transducer means for reading out the information recorded on said disc;
- drive means for shifting said playback transducer means on said disc;
- second motor means having a rotatable drive shaft for activating said drive means;
- second sensor means for detecting the number of rotations of said drive shaft and developing an output in accordance therewith;
- and
- control circuit means responsive to said output from said first and second sensor means for selectively activating said second motor at at least two different modes, said two different modes comprising:
- a fast rotation mode for shifting said playback transducer means at a high speed;
- and
- a slow rotation mode for shifting said playback transducer at a low speed for performing a playback operation.
Dependencies are inferred from the claim text.