1977-03-31
1978-11-07
Cardillo, Jr., Raymond F.
17910041D, H04R 916
Patent
active
041247833
ABSTRACT:
A transducer comprises a body including a permanent magnet having a pair of pole pieces which define a magnetic gap therebetween, and a stylus assembly including a pair of coils which are positioned within the magnetic gap. The stylus assembly comprises a cantilever arm having a stylus tip at one end, a non-magnetic carrier secured to the other end of the cantilever arm, a pair of armatures in the form of rods of a magnetic material and carried on the carrier, each of the armatures having one of the coils disposed thereon, and support means for mounting the cantilever arm and the carrier on the body in an oscillatable manner. The coils and the associated armatures are located on the opposite sides of a first imaginary vertical plane which includes the axis of the cantilever arm and lie in a second imaginary vertical plane which is perpendicular to the first plane. Each armature has an axis which is parallel to a modulation axis of a sound groove of a record disk, as projected onto the second plane so as to intersect the axis of the cantilever arm. The point of intersection between the axes of the armatures is spaced from the axis of the arm in the second vertical plane and lies in the first vertical plane. The pair of pole pieces are located on the opposite sides of the second vertical plane in a manner such that the flux passing through the magnetic gap is substantially perpendicular to the second vertical plane. The body is provided with output terminals, and the stylus assembly include lead wires on which voltages induced across the respective coils are produced, the lead wires being connected with the output terminals.
REFERENCES:
patent: 2114471 (1938-04-01), Keller et al.
patent: 3142729 (1964-07-01), Davis
patent: 3299219 (1967-01-01), Madsen
patent: 3679843 (1972-07-01), Cho
patent: 3720796 (1973-03-01), Honma
patent: 3729596 (1973-04-01), Toth
patent: 3761647 (1973-09-01), Nemoto et al.
Cardillo, Jr. Raymond F.
Kabushiki Kaisha Audio-Technica
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