Electromagnetic transducers for converting mechanically acoustic

Details Electromagnetic transducers for converting mechanically acoustic Electromagnetic transducers for converting mechanically acoustic

1980-05-12

1983-01-04

Cardillo, Jr., Raymond F.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Mechanical modification or sensing of storage medium

369149, H04R 1112

Patent

active

043675441

ABSTRACT:
An electromagnetic transducer for converting mechanical or recorded acoustic events into alternating voltages particularly for tracing stereo signals recorded on plate shaped supports comprises a substantially cylindrical permanent magnet which is radially magnetized and disposed around four pole rods each of which has a coil winding therearound and whose axes are arranged substantially at corner points of a square in a plane perpendicular to the axes of the rods. A pickup stylus has a soft iron element which is driven by the stylus and which is disposed adjacent one end of the pole rods. The stylus is mounted for swinging movement about its center point, on the central axis of the transducer system. The soft iron element is directly included in the magnetic circuit at one end of the permanent magnet.

REFERENCES:
patent: Re29252 (1977-05-01), Anneberg et al.
patent: 3441688 (1969-04-01), Shaper
patent: 4103117 (1978-07-01), Moninaga
patent: 4124782 (1978-11-01), Schon
patent: 4161631 (1979-07-01), Matsuda

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