Pickup arm device dynamically damped

Details Pickup arm device dynamically damped Pickup arm device dynamically damped

1976-12-15

1978-03-21

Phillips, Charles E.

Undertaking

G11B 316, G11B 318

Patent

active

040799433

ABSTRACT:
A phonograph pickup arm device wherein one end of a balance weight is connected to one end of an arm through a spring, and a first magnet is supported at the other end of the weight and is immersed in a viscous oil. A second magnet is disposed for displacement toward or away from the first magnet for adjusting the magnetic force acting therebetween so that the compliance of the device which is related to the arm resonance frequency, may be changed and consequently the arm resonance amplitude may be substantially reduced.

REFERENCES:
patent: 3156472 (1964-11-01), Brock
patent: 3623734 (1971-11-01), Sakamoto
patent: 3836155 (1974-09-01), Joannou
patent: 3926440 (1975-12-01), Wren

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