Transducer arm assembly for disk play-back machines

Details Transducer arm assembly for disk play-back machines Transducer arm assembly for disk play-back machines

1984-12-06

1988-01-26

Stephan, Steven L.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Specified detail of transducer assembly support structure

369250, 369251, G11B 2116

Patent

active

047220805

ABSTRACT:
A tangential transducer arm assembly for disk play-back machines, whose pivot for movement in the plane which is parallel to the surface of a disk, is disposed upon a carriage for linear movement upon a track in a plane which exists perpendicular to said disk and which intersects the rotational axis of said disk.
One of two embodiments utilizes the frictional drag between said disk and a stylus to pull said carriage along said track, while a mass suspended in a liquid checks that movement to hold said carriage in the correct position for transducer arm tangency.
The other embodiment utilizes a stepping motor to drive said carriage along said track. Said stepping motor derives its drive signal from the misalignment of a magnet and a differential Hall effect sensor. Said magnet is part of said transducer arm and said differential Hall effect sensor is fixed to a true tangency indicating reference base, whose pivot is the same as said pivot and whose rotation is determined by a cam surface.
A lift motor, having an eccentric pulley fixed to a central magnet disk with an up and a down position, governs the start/stop of said stepping motor via said magnet disk and a stationary Hall effect switch.

REFERENCES:
patent: 2006605 (1935-07-01), Putnoky
patent: 2966360 (1960-12-01), Herve
patent: 3059934 (1962-10-01), Urmeny
patent: 3476394 (1969-11-01), Birch
patent: 4316280 (1982-02-01), Kanchev

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