Browse Prior Art Database

Device for Fast Access of Multiple Recording Tracks of Magnetic Disk Drives

IP.com Disclosure Number: IPCOM000106431D
Original Publication Date: 1993-Nov-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Hinkel, H: AUTHOR [+2]

Abstract

Disclosed is an active piezo access device (PAD) placed between the head slider and the R/W element. The PAD is a cantilever beam integrated into the head slider and produced by micromechanical manufacturing techniques. Slider suspension assembly and an actuator are conventional. The active piezo access device is driven by an applied voltage as to result in a lateral movement of the beam carrying the R/W element.

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Device for Fast Access of Multiple Recording Tracks of Magnetic Disk Drives

      Disclosed is an active piezo access device (PAD) placed between
the head slider and the R/W element.  The PAD is a cantilever beam
integrated into the head slider and produced by micromechanical
manufacturing techniques.  Slider suspension assembly and an actuator
are conventional.  The active piezo access device is driven by an
applied voltage as to result in a lateral movement of the beam
carrying the R/W element.

      The PAD is activated once the conventional actuator has been
servoed over the target track and data are required from adjacent
tracks.  The piezo access is independent of the conventional actuator
and servoing by piezo is embedded into the conventional servo (piggy
back servo), i.e., the output signal of the R/W element (moved by
piezo force) is fed into the conventional feedback electronics.

      The cantilever beam 1 (which consists for example of silicon)
has a piezo-active layer on top.  The R/W element and its electrical
wiring in the X/Z plane is attached to its front side, per pendicular
to the air bearing surface 2.

      The high access speed (0.01 - 0.1 msec) from track to track is
achieved by electrically activated movement of the beam thanks to its
extremely low mass of approximately 1 &mu.g moved.  Electrical
driving voltages are below 100 volts.

      In case of several heads on one actuator, the various R/W
elements can be positio...