Torsion transducer for magnetic storage disk drives

Details Torsion transducer for magnetic storage disk drives Torsion transducer for magnetic storage disk drives

1988-02-05

1990-02-27

Faber, Alan

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7703, 360 7811, 310333, 338 47, 318646, 7386233, 7386235, G11B 555, G01L 310

Patent

active

049051075

ABSTRACT:
A torsion transducer for providing electrical position and angular velocity signals for a device driven in a bidirectional partial rotational mode, such as commonly found in the rotary actuator arm of a disc drive for rotating computer memories. The torsion transducer comprises a torsion bar in the form of a wire, with one end attached to the rotating element of the actuator arm and the other to a piezoelectric transducer operating in the shear mode, which is anchored to the stationary frame of the device. As the torsion bar is twisted by the angular motion of the rotary element, torque is applied to the piezoelectric transducer, which then generates an electrical signal that can be processed to represent position and angular velocity of the rotary elements of the actuator arm.

REFERENCES:
patent: 3757257 (1973-09-01), Knitter
patent: 4396959 (1983-08-01), Harrison et al.
patent: 4652786 (1987-03-01), Mishiro

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