Position displacement detecting apparatus

Details Position displacement detecting apparatus Position displacement detecting apparatus

1993-09-30

1995-04-04

Psitos, Aristotelis

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Electrical modification or sensing of storage medium

250306, G11B 900, G01N 2300

Patent

active

054043492

ABSTRACT:
An apparatus capable of detecting a displacement of a probe from a track of a recording medium caused by track fluctuations and vibrations at a recording/reproducing period. For example, a probe is maintained to vibrate at a frequency and in the direction perpendicular to a data train at a amplitude smaller than the width of the data train. In this case, the amplitude of a reproduced signal of the data train changes with the displacement between the probe and the data train. An envelope signal of the reproduced signal is phase detected using as a reference signal the vibration waveform (standard signal) at frequency f.sub.o of the probe, to obtain a signal proportional to the displacement from the data train. Using this signal, it becomes possible to feedback control the probe so as to make it trace the data train.

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patent: 4500981 (1985-02-01), Sugiyama
patent: 4835631 (1989-05-01), Miyake et al.
patent: 5059793 (1991-10-01), Miyamoto et al.
patent: 5072116 (1991-12-01), Kawade et al.
patent: 5144581 (1992-09-01), Toda et al.
patent: 5241527 (1993-08-01), Eguchi et al.
Helvetica Physica Acta, "Scanning Tunneling Microscopy", G. Binnig et al., vol. 55, 1982, pp. 726-735.

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