Device for controlling tone arm carrying moving coil type pickup

Details Device for controlling tone arm carrying moving coil type pickup Device for controlling tone arm carrying moving coil type pickup

1981-10-08

1984-01-31

Stephan, Steven L.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Having power driven transducer assembly

369 43, 369147, 369152, 369221, 369222, 369251, G11B 310, H04R 916

Patent

active

044293798

ABSTRACT:
Moving coils of a phonograph pickup are made of a substance having magnetoresistance so that the electrical resistance of the coils are detected by means of bridge circuits. The amounts of resistance variation of the coils are used to produce a vertical component output signal and a horizontal component output signal which respectively indicate the vertical and horizontal displacements of the coils from its optimum operating point with respect to the magnetic field of the pickup. The vertical and horizontal component output signals are used to control vertical and horizontal control motors which correct the attitude of the tone arm so that the moving coils are accurately positioned at the optimum operating point irrespective of the warp and/or eccentricity of the phonograph disk.

REFERENCES:
patent: 4102536 (1978-07-01), Clunis
patent: 4105961 (1978-08-01), Plummer et al.
patent: 4209670 (1980-06-01), Ona et al.
patent: 4301528 (1981-11-01), Leri
Radio Shack Dictionary of Electronics, 1974-1975, p. 344.
McGraw-Hill Dictionary of Scientific and Technical Terms, 1974, p. 893.
McGuire et al., Anisotropic Magnetoresistance in ferromagnetic Alloys, IEEE Transactions on Magnetics, vol. Mag-11, No. 4, Jul. 1975, pp. 1018-1038.

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