Reference mark coding system

Details Reference mark coding system Reference mark coding system

1984-02-29

1987-02-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

33125C, H01J 314

Patent

active

046459251

ABSTRACT:
A measuring system includes reference marks provided in the measuring direction alongside the graduation of the scale. These reference marks are absolutely allocated to the graduation and are used to generate reproduceable control pulses. For the identification of each reference mark there is serially allocated to each reference mark a code mark which is made up of code mark segments. The code mark segments follow one upon the other without gaps in the measuring direction, and each includes a homogeneously continuous surface or zone. These code mark segments are arranged in correspondence to their coded information, offset parallel to one another transversely to the measuring direction and are scanned by a scanning field which is integrated in the scanning field used to scan the reference marks. This gapless arrangement of the code mark segments prevents interference with the scanning of the reference marks.

REFERENCES:
patent: 4158509 (1979-06-01), Rieder et al.
patent: 4384204 (1983-05-01), Tamaki et al.
patent: 4403859 (1983-09-01), Ernst
patent: 4477189 (1984-10-01), Ernst
patent: 4491928 (1985-01-01), Reichl

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