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Vibration Damping Voice Coil Motor

IP.com Disclosure Number: IPCOM000116703D
Original Publication Date: 1995-Oct-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Kai, K: AUTHOR [+3]

Abstract

This article discloses a design to minimize acoustic emission during a seek operation in a Hard Disk Drive. A Voice Coil Motor (VCM) is often used to drive the head arm of the device. Yokes, or backing iron is used to control the magnetic flux of the permanent magnets. Vibration of the yoke is a major source of acoustic noise. By providing two plates per yoke bonded together with an adhesive, vibration is effectively damped.

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Vibration Damping Voice Coil Motor

      This article discloses a design to minimize acoustic emission
during a seek operation in a Hard Disk Drive.  A Voice Coil Motor
(VCM) is often used to drive the head arm of the device.  Yokes, or
backing iron is used to control the magnetic flux of the permanent
magnets.  Vibration of the yoke is a major source of acoustic noise.
By providing two plates per yoke bonded together with an adhesive,
vibration is effectively damped.

      In the Figure, Yoke Plate (1) and Yoke Plate (2) are bonded
together with adhesive (3) and form a backing iron.  The adhesive
between the two sheets damp out vibration.  By creating a VCM in this
manner, entire height of the VCM is not affected.  This design can be
used for low-profile VCM's also.

      By effectively damping vibration of the VCM, acoustic noise and
performance of the Hard Disk Drive can be improved.