Pickup cartridge having means for producing magnetic fields of o

Details Pickup cartridge having means for producing magnetic fields of o Pickup cartridge having means for producing magnetic fields of o

1978-10-20

1981-02-17

Hecker, Stuart M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Mechanical modification or sensing of storage medium

369147, H04R 916

Patent

active

042516951

ABSTRACT:
A moving-coil type pickup cartridge comprises a vibration system including a stylus for tracing a sound groove of a record disc, at least one coil plate adapted to vibrate in response to vibration of the stylus of the vibration system, and an arrangement for producing magnetic fields with respect to the coil plate. The coil plate has at least one coil formed by thin film in a spirally-shaped pattern. The magnetic field producing arrangement has at least one permanent magnet for producing magnetic fields wherein are produced magnetic fluxes of mutually opposite directions respectively in regions of the coil resulting from substantially halving of the coil in the vibration direction thereof.

REFERENCES:
patent: 2034872 (1936-03-01), Keller
patent: 3139490 (1964-06-01), Lyons
patent: 3207857 (1965-09-01), Poutot
patent: 3360616 (1967-12-01), Shiga et al.
patent: 3618124 (1971-11-01), Dreisbach
patent: 3648264 (1972-03-01), Gruczelak et al.
patent: 3679843 (1972-07-01), Cho
patent: 3903594 (1975-09-01), Koneval
patent: 3932827 (1976-01-01), Buhrer
patent: 4093833 (1978-06-01), Tsukamoto
patent: 4124783 (1978-11-01), Nemoto

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