Beam position detection system for use in an optical scanning sy

Details Beam position detection system for use in an optical scanning sy Beam position detection system for use in an optical scanning sy

1982-09-27

1984-10-16

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250235, 350 65, 355 8, 358285, G02B 2717, H01J 314

Patent

active

044777272

ABSTRACT:
An incremental optical position sensing system utilizes a single laser beam and an out of focus grating which is between a pair of lenses whose focal planes coincide. The scanning laser beam passes through the first lens, scans the grating, passes through the second lens and impinges upon a pair of sensors. The phase correlation between the signals from the sensors is used to determine the direction of motion of the laser beam and an up/down counter is utilized to accumulate the absolute position of the beam.

REFERENCES:
patent: 4178064 (1979-12-01), Mrdjen
patent: 4216378 (1980-08-01), Monette
patent: 4256959 (1981-03-01), Monette
patent: 4279472 (1981-07-01), Street
patent: 4424589 (1984-01-01), Thomas et al.

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