Dynamic information storage or retrieval – Dynamic mechanism subsystem – Having power driven transducer assembly
Patent
1982-10-26
1984-09-25
Stephan, Steven L.
Dynamic information storage or retrieval
Dynamic mechanism subsystem
Having power driven transducer assembly
369215, 369244, G11B 308, G11B 334
Patent
active
044738986
ABSTRACT:
A pulse generator associated with a pickup arm drive motor produces a pulse train signal as the pickup arm moves inward and outward with respect to the turntable, and the number of the pulses is counted to detect the position of the pickup arm. In order to remove undesirable influence due to overshoot of the pickup arm caused by inertia of the pickup drive system, the number of the pulses is continuously counted by a counter within a microcomputer for a predetermined period of time after deenergization of the pickup arm drive motor so that the number of the pulses indicates the actual position of the pickup arm. In one embodiment, each pulse is detected by recognizing the rising edge when the pickup arm is moved in one direction, and each pulse is detected by recognizing the falling edge when the pickup arm is moved in the other direction.
REFERENCES:
patent: 4142729 (1979-03-01), McLennan
patent: 4214756 (1980-07-01), Ohmura
patent: 4230323 (1980-10-01), Tsuji et al.
patent: 4342108 (1982-07-01), Kitamura et al.
Stephan Steven L.
Victor Company of Japan , Limited
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