Signal pickup device in rotary recording medium reproducing appa

Details Signal pickup device in rotary recording medium reproducing appa Signal pickup device in rotary recording medium reproducing appa

1981-04-14

1983-05-03

Konick, Bernard

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

369139, 369221, 358907, G11B 338, G11B 2110

Patent

active

043822932

ABSTRACT:
A signal pickup device in a rotary recording medium reproducing apparatus comprises a cantilever having at a free distal end thereof a reproducing element for reproducing recorded signals from tracks of a rotary recording medium, a permanent magnet magnetized in an axial direction of the cantilever and fixed to the cantilever at proximal end thereof, an elastic support member extending perpendicular to a longitudinal direction of said tracks and supporting the proximal end of the cantilever so that the cantilever is rotatable, accompanied by elastic deformation of the elastic support member, and tracking control coil device supplied with a tracking control current to attract and repulse the permanent magnet to cause the cantilever to rotate. The reproducing element is displaced in a direction perpendicular to the longitudinal direction of the recording tracks of the rotary recording medium to tracks. The tracking control coil device comprises at least a single rear-side tracking coil disposed at a position opposite to the reproducing element with respect to the elastic support member to confront a magnetic pole of the permanent magnet and at least a single front-side tracking coil disposed at a position toward the reproducing element with respect to the elastic support member to confront an opposite magnetic pole of the permanent magnet, with axes of the rear-side and front-side tracking coils being arranged in a direction perpendicular to an axial direction of the cantilever.

REFERENCES:
patent: 3992017 (1976-11-01), Mori et al.
patent: 4075418 (1978-02-01), Nemoto et al.
patent: 4160268 (1979-07-01), Goto et al.
patent: 4170783 (1979-10-01), Tajima

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