Read head adjusting motor assembly

Details Read head adjusting motor assembly Read head adjusting motor assembly

1986-12-22

1988-10-18

McElheny, Jr., Donald

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369112, 369 44, G11B 7095

Patent

active

047792540

ABSTRACT:
A motor assembly incorporated in an optical read head to effect tracking or focusing movement of an optical element comprises a generally horseshoe-shaped field assembly having two slotted pole pieces magnetized with opposite polarity of a permanent magnet to provide two pairs of field poles confronting corresponding poles of a moveable armature. A single coil is wound through the slots of the pole pieces around the inner field poles. The direction and intensity of the current flowing in the field coil determines the degree to which the permanent magnetism is reinforced in one pole of each pole piece and counteracted in the other pole of each pole piece, thereby causing corresponding movement of the armature.

REFERENCES:
patent: 4479051 (1984-10-01), Musha
patent: 4633456 (1986-12-01), Luecke

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