Coded disc for an optoelectronic displacement or angle...

Details Coded disc for an optoelectronic displacement or angle... Coded disc for an optoelectronic displacement or angle...

2005-05-03

2005-05-03

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S234000, C250S23700G

Reexamination Certificate

active

06888126

ABSTRACT:
An optoelectronic position measuring device includes an encoder disk having a coding with a digital code and an analog coded track. The analog track includes segments which are in a series and whose width changes. An illuminator images the coding onto a sensor having transducers. The sensor determines the width of the analog track at a given position of the disk relative to the sensor as a function of the number of transducers upon which the analog track is optically imaged onto. The analog track is part of a continuous reference code track which has central symmetry in which the segments have a code length corresponding to the smallest resolution step of the digital coding. The layout of the segments and the resolving power of the sensor are matched such that movement of the disk along the code length is resolvable into at least two defined steps.

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