Dynamic information storage or retrieval – Dynamic mechanism subsystem – Mechanism condition or storage medium responsive control
Patent
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
Haroian Harry N.
K.K. Koshin Denki Seisakusho
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