Device for detecting the position of an optical head

Details Device for detecting the position of an optical head Device for detecting the position of an optical head

1988-01-26

1990-07-24

McElheny, Jr., Donald

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

G11B 718

Patent

active

049431668

ABSTRACT:
A position-detecting device comprising a scale, a first photo-interrupter, and a second photo-interrupter. The scale is attached to a movable member, and has a plurality of slits arranged at regular intervals. Each photo-interrupter includes a light source and a light detector, which are located at opposing sides of said scale, respectively. The first and second photo-interrupters are spaced apart such that when the scale moves, they generate, respectively, a first signal and a second signal which have a phase difference of .pi./2. These signals are processed, thereby to determine the position of the movable member with high accuracy.

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