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Short Stroke Flexure Bearing Actuator

IP.com Disclosure Number: IPCOM000074644D
Original Publication Date: 1971-May-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 64K

Publishing Venue

IBM

Related People

Gibeau, FC: AUTHOR [+2]

Abstract

A linear actuator or voice coil motor, such as is employed in magnetic disk files with head arm assemblies for accessing the record disks, is composed of permanent magnets 10 surrounding a center pole piece 11 and an outer pole piece 12, and encompassed by end pieces 14. A cylindrical coil 16 is placed in a nonmagnetic gap formed by the center pole piece 11 and the outer pole piece 12. By application of current to the coil, the coil structure may be moved the length of the center pole piece along the coil axis.

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Short Stroke Flexure Bearing Actuator

A linear actuator or voice coil motor, such as is employed in magnetic disk files with head arm assemblies for accessing the record disks, is composed of permanent magnets 10 surrounding a center pole piece 11 and an outer pole piece 12, and encompassed by end pieces 14. A cylindrical coil 16 is placed in a nonmagnetic gap formed by the center pole piece 11 and the outer pole piece
12. By application of current to the coil, the coil structure may be moved the length of the center pole piece along the coil axis.

The coil 16 is mounted to flexures 18 which replace conventionally used roller bearings or air bearings. The flexures avoid sticking, afford rapid accessing, and increase the life of the motor.

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