Lawrence Adrian Wilcox

US Patent:

49624377, Oct 9, 1990

Filed:

Jan 19, 1990

Appl. No.:

7/471018

Inventors:

Lawrence A. Wilcox - Yukon OK

Assignee:

Magnetic Peripherals Inc. - Minnetonka MN

International Classification:

G11B 560
G11B 517

US Classification:

360103

Abstract:

A disc drive servo head having two thin film transducers, one of which is disabled from reading by lapping away its pole tips. The coils of the disabled transducer are oppositely wound from the usable transducer's and induce an equal and opposite signal from background noise, such as generated by adjacent data heads during write. The signals from the disabled tranducer coils are combined with the signals from the usable transducer during reading of servo data to concel background noise.

US Patent:

48686956, Sep 19, 1989

Filed:

Mar 30, 1988

Appl. No.:

7/175448

Inventors:

Robert A. Quatro - Oklahoma City OK
Lawrence A. Wilcox - Mustang OK

Assignee:

Magnetic Peripherals Inc. - Minneapolis MN

International Classification:

G11B 554

US Classification:

360104

Abstract:

A head/arm lock mechanism includes a pawl mounted to the armature of a bistable solenoid, the armature being stable in either of two rotary positions. The armature and pawl are limited to move through an angle less than that defined by the stable positions of the armature, so that the armature is biased by the magnetic circuit of the solenoid to one or the other limit positions. When the head/arm is in position to be locked, the solenoid is energized to lock against a spacer on the head/arm and the magnetic circuit continues to hold the pawl in a lock-engaging position upon de-energization of the solenoid. When the head/arm is to be unlocked, the solenoid is again energized to unlock the pawl from the spacer and the magnetic circuit continues to hold the pawl in an unlock position upon de-energization of the solenoid.

US Patent:

46527796, Mar 24, 1987

Filed:

Oct 30, 1984

Appl. No.:

6/666525

Inventors:

Lawrence A. Wilcox - Mustang OK

Assignee:

Magnetic Peripherals Inc. - Minneapolis MN

International Classification:

H02K 4100

US Classification:

310 13

Abstract:

A construction for actuator assemblies is disclosed using a material of low permeance as a structural element, included normal to the axis of coil movement to lower coil inductance by reducing reactance flux in support structures and providing a channel for eddy currents set up in response to coil reactance. The net result is enhanced coil responsiveness to energization.