Pickup arm

Details Pickup arm Pickup arm

1979-03-13

1981-04-28

Haroian, Harry N.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Mechanism condition or storage medium responsive control

369252, G11B 310

Patent

active

042640784

ABSTRACT:
A pickup arm for use in phonographs or the like having a contactless inside-force cancelling device and/or a contactless stylus-force application device; the contactless inside-force cancelling device having a rotatable control magnet, a stationary control magnet, a cylindrical magnet fixed around the vertical pivot of the pickup arm, the rotatable and stationary control magnets combinedly forming a magnetic field in which the cylindrical magnet is rotatably placed, wherein rotation of the rotatable control magnet changes the magnetic flux density of the magnetic field to give the vertical pivot a torque sufficient to cancel the inside force of the stylus; the contactless stylus-force application device having a rotatable control magnet, a stationary control magnet, a cylindrical magnet fixedly provided on a horizontal axle fixed between the prongs of a forked end provided on the vertical pivot, the rotatable and stationary control magnets combinedly forming a magnetic field in which the cylindrical magnet is rotatably placed, wherein rotation of the rotatable control magnet changes the magnetic flux density of the magnetic field to give the vertical pivot a torque corresponding to the stylus force.

REFERENCES:
patent: 3292935 (1966-12-01), Cooper
patent: 3731938 (1973-05-01), Wren
patent: 4066267 (1978-01-01), Kagata

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