Dynamic information storage or retrieval – With servo positioning of transducer assembly over track...
Patent
1981-09-11
1983-08-30
Richardson, Robert L.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
358312, 358342, 358907, 360 102, 369 44, H04N 576, G11B 310, G11B 2102
Patent
active
044020708
ABSTRACT:
A transfer control device for a reproducing transducer in a rotary recording medium reproducing apparatus having a reproducing transducer for reproducing recorded signals from a rotary recording medium and a driving motor for transferring said reproducing transducer on said rotary recording medium comprises a micro-computer having first and second output ports, where the first output port produces a signal of a pulse form which repeats high-level and low-level periods during a normal-speed transferring mode, and the second output port produces a continuous high-level or low-level signal according to the transferring mode so that a combination of a predetermined level is obtained between the output signal from the first output port, a square wave signal generating circuit applied with the output signal from the first output port of the micro-computer, where the square wave signal generating circuit is triggered to produce a predetermined square wave signal when applied with the signal of a pulse form and not triggered when applied with other signals of constant level, and a switching circuit applied with the output signal from the first and second output ports of the micro-computer, to switch over a plurality of input terminals according to the levels of the applied signals and pass the input terminal voltage through to an output side as an output voltage. The switching circuit supplies the output voltage thus obtained to the driving motor.
REFERENCES:
patent: 3993863 (1976-11-01), Leedom et al.
patent: 4310914 (1982-01-01), Riddle
patent: 4321622 (1982-03-01), Jerome et al.
Abe Ryozo
Kaneda Isami
Sakakibara Susumu
Sano Yasushi
Sugiyama Hiroyuki
Bernat Louis
Richardson Robert L.
Victor Company of Japan Ltd.
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