Pickup cartridge with moving magnet armature

Details Pickup cartridge with moving magnet armature Pickup cartridge with moving magnet armature

1975-12-03

1978-07-25

Konick, Bernard

Undertaking

17910041K, 274 37, H04R 1112

Patent

active

041031164

ABSTRACT:
A pickup cartridge of the moving magnet type. The vibration center of its vibrating system is stabilized by being concentrated at a certain point without appreciable fluctuations, regardless of the vibration amplitude of the vibrating system. Also, it has a very high conversion efficiency of its displacement-magnetism converting system for converting the positional changes of this vibrating system to changes in magnetism. This conversion efficiency is almost constant regardless of the vibration amplitude of the vibrating system.
A damping member is interposed between an armature magnet and a member for supporting this armature magnet. A cantilever attached to the magnet is pulled, jointly with the armature magnet, by a tension wire connected to the base of this cantilever, toward the supporting member in the axial direction of the cantilever. The base end of the cantilever is positioned substantially at the center of that surface of the armature magnet which faces the supporting member via the damping member. The other surface of the armature magnet faced by the pole pieces of the displacement-magnetism converting system is a plane having a substantially constant radius of curvature centering around the base of the cantilever.

REFERENCES:
patent: 2379782 (1945-07-01), Bobb
patent: 3576955 (1971-05-01), Obata
patent: 3614332 (1971-10-01), Nagasaki
patent: 3627931 (1971-12-01), Matsuda
patent: 3694586 (1972-09-01), Grado
patent: 3700829 (1972-10-01), Anneberg
patent: 3760125 (1973-09-01), Laue
patent: 3904837 (1975-09-01), Sugimoto

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