Browse Prior Art Database

Piezoelectric Actuator for Small Hard Disk Drive

IP.com Disclosure Number: IPCOM000103938D
Original Publication Date: 1993-Feb-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 2 page(s) / 63K

Publishing Venue

IBM

Related People

Iwasaki, K: AUTHOR [+3]

Abstract

Disclosed is a piezoelectric actuator for a small hard disk drive of 1.8 inches or less in disk diameter. The actuator here is solely made of piezoelectric elements instead of voice coil motor of conventional actuator. The actuator operates with two piezo elements; one for long stroke movement and the other for fine movement. The long stroke can be realized by expanding a small piezo displacement (10&mu.m) to a large one(10&mu.m) using two steps enlarging mechanism. A hard disk drive is made of two or more actuators. Disk surface is divided into multiple zones, and each actuator is allocated to each zone. Thus large memory capacity and high access speed are realized by zone bit recording using multiple piezoelectric actuators.

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Piezoelectric Actuator for Small Hard Disk Drive

      Disclosed is a piezoelectric actuator for a small hard disk
drive of 1.8 inches or less in disk diameter.  The actuator here is
solely made of piezoelectric elements instead of voice coil motor of
conventional actuator.  The actuator operates with two piezo
elements; one for long stroke movement and the other for fine
movement.  The long stroke can be realized by expanding a small piezo
displacement (10&mu.m) to a large one(10&mu.m) using two steps
enlarging mechanism.  A hard disk drive is made of two or more
actuators.  Disk surface is divided into multiple zones, and each
actuator is allocated to each zone.  Thus large memory capacity and
high access speed are realized by zone bit recording using multiple
piezoelectric actuators.

      Fig. 1 shows an example of the piezoelectric actuator.  Two
piezo elements are used; one (noted A) is for long stroke movement
and the other (noted B) is for fine movement.  When a certain voltage
is applied to the piezo A, it expands and pushes the arms.  The tip
of the right arm then moves to right direction and that of the left
arm to left direction.  These movements are then transferred to
torque around the pivot and cause rotation of the stage.  The
suspension fixed on the stage rotates around the pivot in accordance
with stage movement.  At the tip of the suspension the head is
attached.  Long stroke of the head is thus achieved by the piezo A.
For example,...