Sound pickup having plastic enveloped pole plate to pole rod jun

Details Sound pickup having plastic enveloped pole plate to pole rod jun Sound pickup having plastic enveloped pole plate to pole rod jun

1976-07-27

1978-11-07

Cardillo, Jr., Raymond F.

17910041M, 17910041Z, H04R 1112

Patent

active

041247825

ABSTRACT:
An electromagnetic or magnetodynamic transducer-sound pickup comprises a phonograph needle which is connected to either a permanent magnet or a soft iron magnetic member and which is mounted for oscillation in front of, or between a plurality of parallel spaced apart pole rods which are provided with energizing coils. The pole rods are connected at one end to a pole plate. Mechanical oscillations of the magnetic system are suppressed in the zone where the pole plate is connected to the pole rods or in the zone where the pole plate is connected to the permanent magnet by an envelope of plastic which is injection molded around the plate and the rods.

REFERENCES:
patent: 3146319 (1964-08-01), Stanton
patent: 3299219 (1967-01-01), Madsen
patent: 3349194 (1967-10-01), Shaper
patent: 3441688 (1969-04-01), Shaper
patent: 3576956 (1971-05-01), Lanooy et al.
patent: 3683128 (1972-08-01), Grado

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