Track position correction device

Abstract

Abstract PURPOSE:To suppress minimizingly the position shift of a head due to thermal expansion by providing an expanding/contracting mechanism having an electrostriction element or a magnetostriction element to at least one of a head support member and a torque transmission mechanism, applying an electric signal to the said element and correcting the head position. CONSTITUTION:The expanding/contracting mechanism having the electrostriction element or the magnetostriction element to at least one of notches 8, 9 formed on the way of the actuator arm 3 and the head arm 5 is provided. In the figure, 11 is a U-shaped elastic body whose both ends are inserted to the notch 8 and the electrostriction elements 10, 10' are clipped between them. When an electric field is applied to the electrostriction elements 10, 10', a strain is produced, and this strain is expanded and delivered to the actuator arm 3. The correcting control of track shift is as follows: Assuming that the head position at high/low temperatures is shifted by delta, when a signal is written and read while providing in advance a displacement larger than the delta by the expanding/contracting mechanism, the track shift of the head is corrected by applying a voltage to the expanding/contracting mechanism so that the signal output of the average value of its envelope is maximized.

Inventors

• 👤 Tamotsu Matsumura
• 👤 保 松村

Bibliographic Details