Rotary encoding device with polygonal reflector and centroid det

Details Rotary encoding device with polygonal reflector and centroid det Rotary encoding device with polygonal reflector and centroid det

1993-02-25

1994-07-12

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023118, G01D 534

Patent

active

053291212

ABSTRACT:
A device for positioning encoding of a rotating shaft in which a polygonal mirror having a number of facets is mounted to the shaft and a light beam is directed towards the facets. The facets of the polygonal mirror reflect the light beam such that a light spot is created on a linear array detector. An analog-to-digital converter is connected to the linear array detector for reading the position of the spot on the spots on the linear array detector. A microprocessor with memory is connected to the analog-to-digital converter to hold and manipulate the data provided by the analog-to-digital converter on the position of the spot and to compute the position of the shaft based upon the data from the analog-to-digital converter.

REFERENCES:
patent: 5103090 (1992-04-01), Weiner et al.
patent: 5126561 (1992-06-01), Nakazawa et al.
patent: 5247173 (1993-09-01), Benchetrit et al.

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