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Browse Prior Art Database

Optical Construction for Dynamic Flying Height Measurement

IP.com Disclosure Number: IPCOM000116554D
Original Publication Date: 1995-Oct-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Fukuzawa, T: AUTHOR [+3]

Abstract

Disclosed is an optical construction to add dynamic measurement capability on a profile measurement type flying height tester based on (1,2).

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 72% of the total text.

Optical Construction for Dynamic Flying Height Measurement

      Disclosed is an optical construction to add dynamic measurement
capability on a profile measurement type flying height tester based
on (1,2).

      The Figure shows an embodiment of this disclosure.  In the
Figure, the illuminating light generated by light source (4) is
guided to the beam splitter (10) through lenses (5), (6) and (8), the
mirror (7), and the polarizer (9).  The light is, then, reflected by
the beam splitter (10) to reach the magnetic head (1) through
objective lenses (11)-(13), quarter lambda plate (14), and the quartz
disk (3).  The reflected light is detected by the color TV camera
(20) through quartz disk (3), quarter lambda plate (14), objective
lenses (13), (15), (16), beam splitter (17), polarity detector (18),
and depolarizer (19).  Flying height profile of the slider (1) is
determined using the two dimensional data obtained by the color TV
camera (20).  This configuration gives an accurate flying height
profile measurement but is not capable of analyzing high frequency
vibrations of the slider (1) dynamically.

      Components (21) through (24) are the added portion for dynamic
measurement capability.  The split light from the beam splitter (17)
is detected by the photo-detector (23) through the polarity detector
(21), the aperture (22), and the color filter (25).  The aperture
(22) is used to locate the slider portion to be analyzed.  The color
filter (25) is to...