Browse Prior Art Database

Head/Suspension Assembly Static Pitch/Roll Angle Tester

IP.com Disclosure Number: IPCOM000112514D
Original Publication Date: 1994-May-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 83K

Publishing Venue

IBM

Related People

Lee, CK: AUTHOR [+3]

Abstract

The disclosed device is a tester that measures the static pitch/roll angles of slider air-bearing surface after it is mounted on the suspension and has applications in both manufacturing and and development process of the direct access storage device industry. A device as disclosed can be used to further reduce the manufacturing tolerance in order to meet the ever increasing demand on improving the direct access storage devices performance.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Head/Suspension Assembly Static Pitch/Roll Angle Tester

      The disclosed device is a tester that measures the static
pitch/roll angles of slider air-bearing surface after it  is mounted
on the suspension and has applications in both manufacturing and and
development process of the direct access storage device industry.  A
device as disclosed can be used to further reduce the manufacturing
tolerance in order to meet the ever increasing demand on improving
the direct access storage devices performance.

      The schematics of the disclosed system is shown in the Figure.
A collimated laser beam is split by a beam splitter which can be
polarization sensitive or insensitive depending on the reflection
property of the slider air-bearing surface and the complexity of the
system desired.  The two quarter waveplates are also optional that
can be removed from the design if a non-polarizing beam splitter is
used.  To simplify the understanding of the principle behind the
disclosed device shown in the Figure, the beam splitter will be
assumed to be a non-polarization beam splitter and psosess equal
efficiency for transmitted and reflected beams.  The two quarter
waveplates will also assume to be absent.  Since the head/suspension
assembly specifications measure the static pitch and roll angle of
mounted air-bearing surfaces from the back of the suspension mounting
plate, the reference surface R sub 1 is designed to be the top
surface of the mounting fixture.  A reflecting surface, which can be
generated by either evaporating a 100 nm aluminum thin film or by
precisely mounting a flat mirror, is placed on top of the slider
mounting fixture.  The two beam spots, one reflected from the slider
air-bearing surface and the other reflected from the reference
reflector, was focused by a focal lens.  By observing the images in
the focal plane turns the incoming light propagation angles
differenc...