Variable pitch position encoder

Details Variable pitch position encoder Variable pitch position encoder

1991-11-04

1993-08-31

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

341 13, G01D 538

Patent

active

052411729

ABSTRACT:
The invention provides an optical encoder for use with various density code wheels. The encoder provides a geometric offset for a photodetector that is fully illuminated. A circuit offset is provided for a photodetector that is not illuminated. The encoder comprises a light source; a principal photodetector; a pair of secondary photodetectors on opposite edges, respectively, of the principal photodetector; and a code wheel having plural alternating windows and spokes which respectively transmit or block light from the light source. The code wheel is mounted between the light source and the photodetector. The principal photodetector has a unit width and a first length. The secondary photodetectors each have a half-unit width and a second length; the second length is less than the first length. The encoder also includes a circuit biased for producing one logic level when all photodetectors are illuminated and producing the opposite logic level when only the secondary photodetectors are illuminated or when no photodetectors are illuminated.

REFERENCES:
patent: 4259570 (1981-03-01), Leonard
patent: 4266125 (1981-05-01), Epstein
patent: 4423958 (1984-01-01), Schmitt
patent: 4451731 (1984-05-01), Leonard
patent: 4691101 (1987-09-01), Leonard
patent: 4963733 (1990-10-01), Spaulding
patent: 4988865 (1991-01-01), Schmidt et al.

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