Pickup arm device dynamically balanced

Details Pickup arm device dynamically balanced Pickup arm device dynamically balanced

G - Physics

11

B

181/63

G11B 3/16 (2006.01) G11B 3/14 (2006.01) G11B 3/18 (2006.01)

Patent

CA 1066631

ABSTRACT OF THE DISCLOSURE 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 there- between 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.

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