Magnetic disk for measuring the azimuth of a transducer head

Details Magnetic disk for measuring the azimuth of a transducer head Magnetic disk for measuring the azimuth of a transducer head

1986-03-12

1987-08-11

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

360 76, G11B 2020, G11B 2110, G01B 730

Patent

active

046864709

ABSTRACT:
A magnetic disk includes a pair of azimuth test tracks of relatively narrow trackwise width located adjacent each other so that a magnetic head, the azimuth of which is to be measured, straddles both tracks at the same time. Each test track includes a recording pattern comprising a series of separate, uniformly spaced magnetic domains of alternating orientation, the recording pattern on one track being in a particular phase relative to the recording pattern on the other track. Upon playback, the magnetic head produces a composite playback signal comprising a series of localized peaks, the time between adjacent peaks being functionally related to head azimuth.

REFERENCES:
patent: 2938962 (1960-05-01), Konins et al.
patent: 3900888 (1975-08-01), Uchikoshi et al.
patent: 4254440 (1981-03-01), Martin
patent: 4519006 (1985-05-01), Nakamichi
patent: 4589038 (1986-05-01), Radtke
patent: 4616281 (1986-10-01), Nakamura

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