Angle position transducer

Optics: measuring and testing – Angle measuring or angular axial alignment – With photodetection remote from measured angle

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Details

356141, 358206, 358285, G01B 1126, H04N 104

Patent

active

044102704

ABSTRACT:
An angle position transducer is shown which is utilized within an optical scanning system that projects a rotating beam of light from a single point and reflects that light from a radial reflector back toward the point. The transducer includes a wedge shaped mask which is arranged between a pair of photodetectors mounted to the left and right of the mask. A second mask limits the amount of light which lands upon the photodetectors during the extreme left or right-hand rotation of the light beam. The output of the photodetectors is combined in an add and subtract circuit to produce a linear output signal which indicates the position of the rotating light beam from its far right to its far left-hand rotational position.

REFERENCES:
patent: 3533699 (1970-10-01), Hopkins et al.
patent: 3617131 (1971-11-01), Taguchi
patent: 3671126 (1972-06-01), Erb
patent: 3963352 (1976-06-01), Rishoud et al.
patent: 4159169 (1979-06-01), Sato

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