Index signal generating circuit

Details Index signal generating circuit Index signal generating circuit

1997-05-28

1999-11-30

Tran, Thang V.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

318254, 318560, G11B 1906

Patent

active

059953144

ABSTRACT:
An index signal generating circuit for generating a precise index signal free from time shifting even under ambient temperature changes. An index signal generating circuit includes a magnet attached onto the circumference of the rotor of a spindle motor, a magnetic flux detecting device for detecting magnetic flux of the magnet when the magnet moves past the magnetic flux detecting device, a Hall effect device for switching a current in the driving coil of the spindle motor, a first waveform shaping circuit for shaping the detected output of the magnetic flux detecting device into a rectangular-wave signal, a second waveform shaping circuit for shaping the output of the Hall effect device into a rectangular-wave signal, and a logic circuit for ANDing the output rectangular-wave signals from the first and second waveform shaping circuits, wherein an index signal is generated at the timing of a transition of the AND output of the logic circuit.

REFERENCES:
patent: 4430603 (1984-02-01), Muller
patent: 4651241 (1987-03-01), von der Heide et al.
patent: 5408153 (1995-04-01), Imai et al.

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