Signal generator for raster type scanners

Details Signal generator for raster type scanners Signal generator for raster type scanners

1977-03-02

1978-07-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, 356170, G01D 530

Patent

active

041004086

ABSTRACT:
A signal generating apparatus driven by the reference beam of an image scanning system is disclosed. The apparatus includes an apertured codeplate across which the reference beam sweeps, light from the beam triggering a photodetector to produce a signal pulse output. A grating is inserted into the beam path to split the reference beam into a plurality of spaced apart beams effective to offset blockage or irregularity of one or more of the codeplate apertures.

REFERENCES:
patent: 2886718 (1959-05-01), Shepherd et al.
patent: 3096441 (1963-07-01), Burkhardt
patent: 3867035 (1975-02-01), Kaul

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