Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1981-04-10
1983-02-08
Stephan, Steven L.
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
369 33, 369 41, 369 65, 369 67, G11B 100, G11B 2504
Patent
active
043731996
ABSTRACT:
Disclosed is an apparatus for electromagnetically imparting stylus force for sound reproducing device comprising an inhibit circuit for shock noise of the reproducing stylus. A selected one of start switches is actuated to start a motor to drive a recorded disc. A rotary contact provided on the rotating recorded disc engage a plurality of fixed contacts arranged such that there is a predetermined positional relationship between the fixed contacts and a position toward which a pickup is lowered so that the pickup may engage the reproduction start point of a specified one of recorded grooves provided circumferentially on the recorded disc, whereby an electromagnetic actuator is actuated in accordance with the timing of engagement between the rotary contact and the specified fixe contact which corresponding to the selected start switch. When the actuator is actuated, an armature of the actuator imparts stylus force upon the pickup. The actuator is held in its actuated status by a self holding transistor circuit. A piece of magnet is provided on the tone arm. When the magnet comes near a magnetically sensitive reed switch provided at the neighbourhood of the end position of reproduction of the recorded disc, the reed switch is closed to turn off the electromagnetic actuator to thereby complete one cycle of reproduction. A pickup inhibit transistor and a capacitor is connected to the connection between the electromagnetic actuator and the actuator self holding transistor circuit so that the pickup is made inoperative during a short period of time when the electromagnetic actuator is made actuated thereby inhibiting the amplification of the shock noises of the reproduction stylus.
REFERENCES:
patent: 3748748 (1973-07-01), Beran et al.
patent: 3799556 (1974-03-01), Watanabe
patent: 4093832 (1978-06-01), Isaaoson et al.
patent: 4245404 (1981-01-01), Yoshinari
Ozen Corporation
Stephan Steven L.
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