Record player having a device for damping vibrations of a tone a

Details Record player having a device for damping vibrations of a tone a Record player having a device for damping vibrations of a tone a

1977-06-08

1978-10-24

Aegerter, Richard E.

Undertaking

G11B 310

Patent

active

041218370

ABSTRACT:
A record player comprises a tone arm provided at the distal end thereof with a pickup cartridge, and a vibration damping device for damping a resonance of the tone arm. The damping device comprises a damping member made of an electrically conductive material and provided at the tone arm in a manner to vibrate unitarily therewith, and a damping unit inclusive of permanent magnet means for forming a magnetic field with respect to the damping member. Eddy currents are generated in the damping member when the damping member vibrates in the magnetic field, whereby damping of the vibration of the damping member and the tone arm is accomplished. The damping device may further comprise an elastic member supported at one end thereof at the tone arm and having another free end and a weight secured to the free end of the elastic member.

REFERENCES:
patent: 1212692 (1917-01-01), Ruckgaber
patent: 2924461 (1960-02-01), Bobb et al.
patent: 2983516 (1961-05-01), Bauer et al.
patent: 3366382 (1968-01-01), Haddy

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