Browse Prior Art Database

New Head Alignment Tester

IP.com Disclosure Number: IPCOM000123077D
Original Publication Date: 1998-May-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Fujiwara, T: AUTHOR [+4]

Abstract

Disclosed is a system to measure alignment of Sliders on an HSA (Head Stuck Assembly) by applying the ability of laser to measure distance. The New Alignment Tester can measure alignment of each Slider by shooting a beam of laser onto them directly while the HSA is moving in the direction right angle to the beam. Old way like shooting beam of light onto the HSA from the vertical direction against the HGA's face and measuring the gap between the outer and the inner shadow of the Marginal Lips (Fig.1) is not enough to measure alignment of each Slider. And moreover, it only means measuring alignment of the Marginal Lips instead of that of the Sliders themselves.

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New Head Alignment Tester

   Disclosed is a system to measure alignment of Sliders on
an HSA (Head Stuck Assembly) by applying the ability of laser to
measure distance.  The New Alignment Tester can measure alignment of
each Slider by shooting a beam of laser onto them directly while the
HSA is moving in the direction right angle to the beam.  Old way like
shooting beam of light onto the HSA from the vertical direction
against the HGA's face and measuring the gap between the outer and
the inner shadow of the Marginal Lips (Fig.1) is not enough to
measure alignment of each Slider.  And moreover, it only means
measuring alignment of the Marginal Lips instead of that of the
Sliders themselves.

   The detail procedure of this Tester is as follows.  First,
the laser obtains data of the HSA's shape by scanning its upper-side
level which  is set in a way the beam is vertical both against the
direction of the HGA's face and that of the Marginal Lip (Fig. 2).
Next, the Computer processes it to find the positions of each Slider.
In that, an algorithm is used in order that the Computer can find
them as correctly as possible; that is, the Computer has series of
numerical information which defines the horizontal position and the
width of window of all the Sliders' edges, within which each of them
is supposed to exist, so that the Computer can search for them only
within the expected windows respectively, and can identify the
sliders' numbers with their positions without mistake....