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Browse Prior Art Database

Biometal Actuated Actuator Latch

IP.com Disclosure Number: IPCOM000103784D
Original Publication Date: 1993-Jan-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 1 page(s) / 55K

Publishing Venue

IBM

Related People

Reidenbach, JR: AUTHOR

Abstract

Described is a mechanism suitable for latching a hard disk drive actuator in its home position. Actuators are typically restricted from moving to protect the integrity of the magnetic media recording surfaces when power is not being provided to a disk drive. Featured is a mechanism that requires only a small amount of power to change states from latched to unlatched, and vice versa, and consumes no power at all during normal file operation. It is actuated by use of a material called BIOMETAL* which possesses the characteristic of contracting in length when electrical current is passed through it. (*BIOMETAL is a tradename of Tokiamerica Technologies Inc. Irvine CA.).

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 92% of the total text.

Biometal Actuated Actuator Latch

      Described is a mechanism suitable for latching a hard disk
drive actuator in its home position.  Actuators are typically
restricted from moving to protect the integrity of the magnetic media
recording surfaces when power is not being provided to a disk drive.
Featured is a mechanism that requires only a small amount of power to
change states from latched to unlatched, and vice versa, and consumes
no power at all during normal file operation.  It is actuated by use
of a material called BIOMETAL* which possesses the characteristic of
contracting in length when electrical current is passed through it.
(*BIOMETAL is a tradename of Tokiamerica Technologies Inc. Irvine
CA.).

      Illustrated in the figure is a bistable lever 1 that pivots
about a shaft 2 and is held in its extreme positions against
stop-posts 3 and 4 by an overcenter spring 5.  At one extreme
position, the tip of the lever engages a disk drive actuator (not
shown) and restricts it from moving.  When moved to its other extreme
position, the lever disengages from the actuator.  Two BIOMETAL wires
6 and 7 are, respectively, anchored to the stop-posts and are also
attached to opposite sides of the lever near the pivot shaft.  When
electrical current is passed through the BIOMETAL wire on the left,
for example, it contracts in length and causes the lever to pivot
toward the stop-post on the right, and vice versa.  Once against a
stop-post, current is discontinued...