System for measuring lengths or angles with a high-velocity mova

Details System for measuring lengths or angles with a high-velocity mova System for measuring lengths or angles with a high-velocity mova

1992-08-17

1994-03-15

Messinger, Michael

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023118, 250237G, G01D 534

Patent

active

052947939

ABSTRACT:
A system for measuring lengths or angles comprises a scale member provided with absolutely coded scale elements and incremental scale elements, a movable scanning unit generating position-dependent signals in response to the reading of the scale elements, and an evaluating unit for determining the absolute position of the scanning unit relative to the scale member in response to the position-dependent signals. The coded scale elements consist of different code words arranged according to a serial code and are read by a multiline detector which, in any position of the scanning unit relative to the scale member, reads at least an entire code word. The evaluating unit is adapted to detect the position of the beginning of the detected code word relative to the detector and to read each code word so as to determine the instantaneous absolute position in coarse steps and is also adapted to detect the position-dependent signals generated in response to the scanning of the incremental scale elements and to coordinate them with the signals from said detector for a determination of the instantaneous absolute position in fine steps.

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