公开(公告)号：EP0256356B1

公开(公告)日：1993-09-15

申请号：EP87110754.6

申请日：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

IPC分类号： G11B5/60 ,  G11B5/48 ,  G11B5/455

CPC分类号： G11B5/012 ,  G11B5/6029 ,  G11B27/36 ,  G11B2005/001 ,  G11B2005/0013

公开(公告)号：EP0256356A3

公开(公告)日：1989-10-18

申请号：EP87110754.6

申请日：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

IPC分类号： G11B5/60 ,  G11B5/48 ,  G11B5/455

CPC分类号： G11B5/012 ,  G11B5/6029 ,  G11B27/36 ,  G11B2005/001 ,  G11B2005/0013

摘要： 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.

公开(公告)号：EP0256356A2

公开(公告)日：1988-02-24

申请号：EP87110754.6

申请日：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

IPC分类号： G11B5/60 ,  G11B5/48 ,  G11B5/455

CPC分类号： G11B5/012 ,  G11B5/6029 ,  G11B27/36 ,  G11B2005/001 ,  G11B2005/0013

摘要： 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.

摘要翻译： 在测量滑动器支持在操作磁性存储系统中的磁换能器的飞行高度的方法，相对运动的磁换能器，并以第一速度的磁性记录介质之间产生的所以没有产生的空气轴承的位置的磁换能器滑块 在从磁介质上的第一浮动高度。 恒定周期性的单个信号被写入在由磁换能器在记录介质的预定区域，和回读信号被从记录介质，以产生第一信号的预定区域感测到的。 磁换能器滑块的飞行高度降低到基本为零，和回读信号在下降飞行高度被感测以产生第二信号。 然后，第一浮动高度被计算为比率，用分贝表示，第一和第二信号时间除以常数的波长。 在另一个实施例的信号的多个被记录和回读信号在两个不同的波长同时感测。 在另一实施例中，信号被记录其中有一个频谱内容包括不同频率的多个，并且回读信号在两个不同的波长同时感测。