Victor Company of Japan, Limited

Hideaki Miyatake

Osamu Tajima

Kunio Goto

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.

Signal pickup device for capacitance disk records

A signal pickup device comprises a reproducing stylus for tracing a track on a rotary recording medium thereby to reproduce the information signal recorded thereon, a cantilever provided at a free distal end thereof with the reproducing stylus, means for supporting the cantilever so as to be rotatable about substantially proximal root end thereof and movable in an longitudinal direction thereof, coil means including at least two movable coils fixed to the support means, means for generating a control signal current in response to deviation of the tracing position of the reproducing stylus from a track to be traced, and supplying the control signal to the coils, and magnetic field forming means secured at a predetermined position of a main body of the device and adapted to apply to the coils a magnetic field in a direction parallel with the rotary recording medium. The coils undergo a motion due to a mutual interaction between the magnetic field and the current flowing therethrough, whereby the reproducing stylus is displaced by way of the cantilever at least in the width of the track and is thereby tracking controlled.

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Yamato, Japan

Hideaki Miyatake