Tone arm driving apparatus

Details Tone arm driving apparatus Tone arm driving apparatus

1979-11-08

1982-01-12

Shepperd, John W.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Having power driven transducer assembly

369225, G11B 308

Patent

active

043109187

ABSTRACT:
A tone arm, designed for use with a semi- or fully automatic record player, is provided with an electromagnetic drive mechanism. The tone arm is supported by two separate shafts so as to be rotatable in both the horizontal and vertical directions. A bobbin, to which horizontal and vertical drive coils are circumferentially attached, is arranged coaxially with that shaft permitting horizontal movement. A permanent magnet is arranged facing the drive coils. Interaction between the permanent magnetic field and those generated by energization of the drive coils causes either a torque or a vertical force to be imparted to the bobbin and thus effect a corresponding movement of the tone arm.

REFERENCES:
patent: 3926440 (1975-12-01), Wren
patent: 4023130 (1977-05-01), Ridler et al.
patent: 4132935 (1979-01-01), Gaus et al.
patent: 4143879 (1979-03-01), Wren
patent: 4214756 (1980-07-01), Ohmura

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