Method to control introduction of diffracted beam by means of di

Details Method to control introduction of diffracted beam by means of di Method to control introduction of diffracted beam by means of di

1978-09-29

1980-08-05

Wintercorn, Richard A.

Photocopying

Contact printing

Light boxes

350 9619, 354 55, 354 56, 355 1, G03B 100

Patent

active

042159245

ABSTRACT:
According to the present invention in the image forming light path a direction-selective diffraction element is provided in such a manner that the image forming beam having entered into said diffraction element is diffracted by means of the diffraction grating structure of said diffraction element and devided into a plurality of beams, whereby at least one of the diffracted beams is led to a photo detecting device while the not diffracted beam is made use of as the image forming beam.

REFERENCES:
patent: 3458702 (1969-07-01), Dryden

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