Noncontact type magnetic head for detecting rate-of-wear in a ro

Details Noncontact type magnetic head for detecting rate-of-wear in a ro Noncontact type magnetic head for detecting rate-of-wear in a ro

1996-09-09

1998-03-17

Snow, Walter E.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324210, 360137, G11B 500, G01R 3312, G01N 2772

Patent

active

057291330

ABSTRACT:
A magnetic sensor is disposed in an opposing relationship to a rotating magnetic head device with a magnetic head mounted thereon and placed in noncontact therewith so as to fall outside a lap angle .alpha. of a magnetic tape. The magnetic sensor is used as a part of oscillating elements of an oscillator circuit. By noting that a magnetic resistance of a magnetic circuit at a rotational position where the magnetic head faces the magnetic sensor changes according to the degree of extension of the magnetic head from the surface of a drum, and taking the change in magnetic resistance as a variation in oscillating frequency, the rate of wear of the magnetic head is measured. Since the change in magnetic resistance is taken as the variation in oscillating frequency, the degree of extension of the magnetic head, i.e., the rate of wear of the magnetic head can be measured with high accuracy. Since an apparatus for measuring the rate of wear of the magnetic head is a noncontact type, there is no risk that the magnetic head to be measured will be damaged. Owing to the above construction, the rate of wear of the magnetic head can be measured in the noncontact state and with high accuracy.

REFERENCES:
patent: 3938193 (1976-02-01), Sargunar

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