Unisys Corporation

Unisys Corporation (Formerly Burroughs Corp.)

Whitney B Kroetz

Frank Ivan Morris

A disk drive actuator is described including automatic eddy-current braking capability, enhanced by simple modifications of coil-mount structure, such as split damping ring and spaced-rib array.

Adjustable brake for magnetic actuator

A disk drive actuator includes automatic eddy-current braking capability, enhanced by simple modifications of coil-mount structure, such as a split damping ring and spaced-rib array to produce intentional eddy current drag at unacceptably high actuation speeds, e.g., above 75 ips.

Controlled-drag voice coil magnetic actuator

A disk drive actuator includes automatic eddy-current braking capability, enhanced by simple modifications of coil-mount structure, such as a split damping ring DR and spaced-rib array DR-R.

Eddy current brake with N impedence gaps

A disk drive actuator including automatic eddy-current braking capability, enhanced by simple modifications of coil-mount structure, such as split damping ring DR and spaced-rib array, this array shown for example in FIG. 12 (see DR-R).

Controlled drag for magnet actuator

A voice-coil linear actuator is embodied wherein the coil-driving structure is coupled to the driven structure (carriage) via a visco-elastic couple member (e.g., elastomeric bonding tape) that changes from an efficient motion-transmitter, at 'operating' coil-generated vibration frequencies, to a poor motion-transmitter/good isolator (mechanical filter) at high frequencies, corresponding to resonant or other deleterious vibration.

Growing community of inventors

Sunnyvale, CA, United States of America

Whitney B Kroetz