Position detecting device for use by switching plural alternatin

Details Position detecting device for use by switching plural alternatin Position detecting device for use by switching plural alternatin

1989-04-06

1991-11-19

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4435, 369 48, 369 4425, 360 7811, G11B 700

Patent

active

050671189

ABSTRACT:
A position detecting device includes a: generator for generating a plurality of phase-shifted signals which are alternately changed in accordance with changes in position or angle of a movable member; a selector for selecting one of the plurality of signals; supplier for supplying a variable level signal; adder for adding a signal selected by the selector and the variable level signal from the signal supplier and outputting a sum signal as a position detection signal; a detector for detecting a phase of the selected signal; and a controller for switching the signal selected by the selector and changing a level of the variable level signal from the signal supplier in accordance with an output from the phase detector.

REFERENCES:
patent: 4416002 (1983-09-01), Oguino et al.
patent: 4443869 (1984-04-01), Ammon
patent: 4464689 (1984-08-01), Propst
patent: 4510537 (1985-04-01), Yoshida et al.
patent: 4590527 (1986-05-01), Waner
patent: 4878135 (1989-10-01), Makino et al.

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