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The effective gap length in magnetic heads can be measured more accurately and more easily by magnetic means than by conventional optical techniques.
English (United States)
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Measuring Gap Length in Magnetic Recording Heads
The effective gap length in magnetic heads can be measured more
accurately and more easily by magnetic means than by conventional optical
Magnetic disk 10 is prerecorded with a constant-frequency signal along a
spiral track 11 as disk 10 rotates at a constant low speed. Thus, the distance
between adjacent signal transitions in track 11 continuously decreases toward
the center of disk 10. The distance between the arms of spiral 11 is greater than
the width of this spiral track.
To measure gap length of recording head 12, conventional access
mechanism 13 positions it at a number of different radial distances on disk 10, so
that it describes circular paths, such as at 14. Bandpass amplifier 15 produces a
modulated output signal, having one point during the revolution of disk 1C which
produces a maximum amplitude, and a diametrically opposite point, such as 16,
having a minimum output due only to noise. As head 12 is scanned inward, a
point will be reached at which the maximum signal falls to the background noise
level because there are two transitions of track 11 within the effective gap length
of head 12. The known spacing of the transitions at this radial distance then
provides the effective length. This measurement technique uses frequency
counting and length measurement, both of which can be performed very simply
and very accurately.
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