Electricity: measuring and testing – Magnetic – Displacement
Patent
1986-06-25
1988-09-06
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Displacement
307358, 324102, 324225, 328110, G01B 730, H03K 5153, H03K 522, G11B 1500
Patent
active
047695978
ABSTRACT:
This invention relates to an index signal generator for a magnetic disk drive. The peak of the magnetic field from the magnet during rotation in association with the rotation of the spindle is detected by a peak detecting circuit. A detection pulse signal output circuit outputs a detection pulse signal synchronously with the peak of the magnetic field on the basis of the result of the detection of the peak detecting circuit. A memory for storing adjustment data is provided. This adjustment data corresponds to the time after the detection pulse signal was output until the index pulse signal is output. An index pulse signal output circuit outputs the index pulse signal on the basis of the adjustment data stored in the memory after an expiration of a period of time corresponding to the adjustment data from the output of the detection pulse signal.
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patent: 4535289 (1985-08-01), Abe et al.
patent: 4609869 (1986-09-01), Metcalf
patent: 4694200 (1987-09-01), Hetyei
Kabushiki Kaisha Toshiba
Strecker Gerard R.
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