Circuit for detecting defects of a magnetic recording head

Details Circuit for detecting defects of a magnetic recording head Circuit for detecting defects of a magnetic recording head

1988-04-26

1989-08-29

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Magnetic information storage element testing

G01R 3312

Patent

active

048620785

ABSTRACT:
When recording information, a write switching current of a write signal is directed through a coil of a magnetic head, whereby the information corresponding to the write signal is to be recorded on a magnetic recording medium. Hence, a back electromotive voltage is inevitably produced at the coil of the magnetic head. Based on the level of this back electromotive voltage, the quality of the magnetic head can be detected. In this case, by use of a synchronizing circuit, the detected timing of the back electromotive voltage is synchronized with a switching timing of the write switching current. Due to this synchronizing circuit, the back electromotive voltage is detected only at the switching timing of the write switching current, whereby it becomes possible to detect the back electromotive voltage, regardless of noise. Thus, it is possible to detect the quality of the magnetic head with accuracy.

REFERENCES:
patent: 4706561 (1987-11-01), Greer
Gagliano et al., "Magnetic Head Tester", IBM-TDB, vol. 6, No. 3, Aug. 1963, pp. 1-3.

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