发明名称 |
A METHOD OF MEASURING THE FLYING HEIGHT OF A SLIDER IN A MOVING MAGNETIC STORAGE APPARATUS |
摘要 |
<p>In a method of measuring the flying height of a slider supporting a magnetic transducer in an operational magnetic storage system, relative motion is produced between the magnetic transducer and a magnetic recording medium at a first velocity so that the resulting air bearing positions the magnetic transducer slider at a first flying height from the magnetic medium. A single signal of constant periodicity is written over a predetermined area of the recording medium by the magnetic transducer, and a readback signal is sensed from the predetermined area of the recording medium to produce a first signal. The flying height of the magnetic transducer slider is lowered to substantially zero, and a readback signal is sensed at the lowered flying height to produce a second signal. The first flying height is then calculated as the ratio, expressed in decibels, of the first and second signals times the wavelength divided by a constant. In another embodiment a plurality of signals are recorded and readback signals are simultaneously sensed at two separate wavelengths. In a further embodiment, a signal is recorded which has a spectral content comprising a plurality of different frequencies, and readback signals are simultaneously sensed at two separate wavelengths.</p> |
申请公布号 |
EP0256356(A3) |
申请公布日期 |
1989.10.18 |
申请号 |
EP19870110754 |
申请日期 |
1987.07.24 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
BROWN, BYRON RICHARD;HU, HUNG LIANG;KLAASSEN, KLAAS BEREND;LUM, JOSEPH JACK;VAN PEPPEN, JACOBUS CORNELIS LEONARDUS;WERESIN, WALTER EUGENE |
分类号 |
G01B7/00;G11B5/00;G11B5/012;G11B5/60;G11B21/21;G11B27/36;(IPC1-7):G11B5/60;G11B5/48 |
主分类号 |
G01B7/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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