Browse Prior Art Database

Advanced Piezoelectric Glide Channel

IP.com Disclosure Number: IPCOM000115785D
Original Publication Date: 1995-Jun-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 87K

Publishing Venue

IBM

Related People

Flechsig, KA: AUTHOR [+6]

Abstract

Magnetic recording on rigid disks is accomplished with magnetic read and write heads in close proximity (flying), or in physical contact, with the disk magnetic recording medium. The magnetic head, (i.e., read/write elements), is typically mounted on a slab of ceramic with rail surfaces defined and polished to allow the slider to fly close to the magnetic recording media. To assure the long-term reliability and data integrity of the head to disk interface, disks are mechanically certified in the manufacturing process, and/or burnished, typically with sliders flying lower than or equal to the data heads. This type of test is referred to, in the disk drive industry, as glide height testing.

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Advanced Piezoelectric Glide Channel

      Magnetic recording on rigid disks is accomplished with magnetic
read and write heads in close proximity (flying), or in physical
contact, with the disk magnetic recording medium.  The magnetic head,
(i.e., read/write elements), is typically mounted on a slab of
ceramic with rail surfaces defined and polished to allow the slider
to fly close to the magnetic recording media.  To assure the
long-term reliability and data integrity of the head to disk
interface, disks are mechanically certified in the manufacturing
process, and/or burnished, typically with sliders flying lower than
or equal to the data heads.  This type of test is referred to, in the
disk drive industry, as glide height testing.  The glide heads are
frequently instrumented with Piezoelectric (PZT) [*], mounted either
on the back of the slider, on the suspension, or on the mounting arm.

      To realize the maximum advantage of the advanced glide heads
which are suitable for ultra-low flying and contact recording file
products, advanced designs are needed.  To advance the current
state-of-the-art in PZT channels, the disclosed channel combines low
noise amplification, high common-mode noise rejection, ground-noise
isolation, and dual bandpass slider rigid and slider bending mode
selection through filtering for use with slider-mounted PZT sensors.

      Disclosed is a piezoelectric glide height sensor channel
design/configuration which provides for a monotonic sensor response
with asperity interference height for signal derived from the slider
rigid body modes, as well as selected slider bending modes.  Th...