Damping vibrations in voice coil actuator

Details Damping vibrations in voice coil actuator Damping vibrations in voice coil actuator

G - Physics

11

B

352/30.1

G11B 5/00 (2006.01) G11B 5/55 (2006.01) H02K 41/035 (2006.01)

Patent

CA 1109556

DAMPING VIBRATIONS IN VOICE COIL ACTUATOR Abstract of the Disclosure An actuator for a disk file comprises a carriage/arm assembly secured to a coil and movable longitudinally upon energization of said coil. To minimize the amplitude of longitudinal resonance vibration in the actuator upon energiza- tion of the coil, the coil is secured to the outer of two concentric overlapping members and the carriage is secured to the inner member. Elastomeric material is disposed radially between and adhered to said concentric members to act as a combination damping means and primary stiffening means for transmitting the major proportion of shear force between said members, and hence, between said coil and carriage. Because stiffness of the elastomeric material varies significantly over the temperature range over which the disk file operates, auxiliary stiffening means is desirably included, preferably in the form of beams which act as springs restraining longitudinal motion between the outer member (and hence the coil) and the carriage. These beams are formed by providing a series of arcuate slots equally spaced circumferentially adjacent that end of the outer member remote from the coil. Each beam is thus defined by that arcuate segment of the outer ring which is between said remote end and the slot. This remaining portion of the shear force is transmitted via the beams which are nested in notches in the carriage.

304088

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