Electromechanical record disk dynamic range expander

Details Electromechanical record disk dynamic range expander Electromechanical record disk dynamic range expander

1978-11-20

1980-12-23

Konick, Bernard

Undertaking

17910041K, 274 37, H04R 1112

Patent

active

042412412

ABSTRACT:
An electromechanical record disk dynamic range expander for use in a stereophonic system. The invention includes a pivotally mounted stylus-bearing shank. Received within the shank are iron inserts which are maintained opposite electromagnetic coils and extended pole pieces. A permanent magnet communicates with the iron inserts by means of a steel fulcrum, and communicates with the extended pole pieces by means of a steel canister receiving the assembly as a whole. The coils are maintained between respective pairs of extended pole pieces and iron inserts, and are wound in such a manner that the number of coil windings increases with distance from the coil centerline. A magnetic gap exists between the extended pole pieces and associated iron inserts, with the respective coils being received within such magnetic gap. Movement of the stylus in a record groove causes the magnetic gap of the associated channel to move, cutting the coil windings and inducing a signal corresponding to the stored tonal image. The coil winding technique results in amplified increases in coil signal strength for linearly increasing mechanical movement of the stylus, achieving dynamic range expansion.

REFERENCES:
patent: 3904837 (1975-09-01), Sugimoto et al.
patent: 3908096 (1975-09-01), Furuya
patent: 3988025 (1976-10-01), Nagamura
patent: 4004108 (1977-01-01), Kurata
patent: 4054758 (1977-10-01), Fidi
patent: 4075418 (1978-02-01), Nemoto et al.
patent: 4093833 (1978-06-01), Tsukamoto
patent: 4103117 (1978-07-01), Morinaga

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