Signal pickup device for capacitance disk records

Details Signal pickup device for capacitance disk records Signal pickup device for capacitance disk records

1981-09-16

1984-10-23

McElheny, Jr., Donald E.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

369170, G11B 906, G11B 1700

Patent

active

044792085

ABSTRACT:
A signal pickup device for capacitance disk records comprises within a housing a stylus control unit responsive to a control signal to counteract the jitter movement of a capacitance detection stylus and to keep it on the right track while the record is spinning at high speeds. The stylus control unit is positioned so that its stylus moving element is movable in longitudinal and transverse directions parallel to the surface of the record. The stylus control unit includes a pivot member to which the stylus cantilever is magnetically secured by a permanent magnet to provide a pivotal movement in response to the control signal, whereby the stylus is rendered movable exclusively in horizontal directions. The device housing is formed with an opening at the bottom thereof to permit the stylus control unit to be secured therein in order to locate it in a lower position with respect to the record surface. This causes the cantilever to be tilted at a small angle to the record surface and reduces undesirable downward pressure which might occur as a result of the surface variations of the spinning record.

REFERENCES:
patent: 3997716 (1976-12-01), Taylor
patent: 4160268 (1979-07-01), Goto et al.
patent: 4170783 (1979-10-01), Tajima
patent: 4320487 (1982-03-01), Guarracini et al.

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