Browse Prior Art Database

Position and Force Control of a Magnetic Head

IP.com Disclosure Number: IPCOM000081572D
Original Publication Date: 1974-Jun-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Kendall, FT: AUTHOR [+2]

Abstract

In the illustrated laminate configuration of corotating flexible storage discs the motion of discs D can be varied by insertion of a not shown probe member, to make room for conformal placement of independently suspended head H adjacent the path of revolution of a disc D confronting the opening made by the probe. It is advantageous to place (cement) a strain gauge E on one of the cantilevered beam spring arms C which support the head H.

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Position and Force Control of a Magnetic Head

In the illustrated laminate configuration of corotating flexible storage discs the motion of discs D can be varied by insertion of a not shown probe member, to make room for conformal placement of independently suspended head H adjacent the path of revolution of a disc D confronting the opening made by the probe. It is advantageous to place (cement) a strain gauge E on one of the cantilevered beam spring arms C which support the head H.

The strain gauge E serves to provide an indication of the tension between the head H and the interfacing discs D, which is useful in establishing optimum tension requisite to the formation of a conformal hydrodynamic lubrication relationship, with minimal gap between the head H and interfacing discs. The minimized gap allows higher track density with repeatable track location. The dual-cantilevered suspension C maintains the head attitude constant relative to the orbit of the discs D (i.e., maintains center line I perpendicular to the disc path).

The strain gauge output can be used either dynamically in a servo feedback loop, or "statically" in an initial adjustment, to control tension of the head suspension. In the dynamic application the strain gauge output feeds bridge circuit BR, which controls servomotor G to rotate lead screw L to move the head suspension parallel to the axis of disc rotation. The tension on the head suspension will be a function of the position of the suspension...