Circuit for detecting defects of a magnetic recording head
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United States of America Patent
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-
Aug 29, 1989
Grant Date -
N/A
app pub date -
Apr 26, 1988
filing date -
May 7, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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