Photocopying – Contact printing – Light boxes
Patent
1977-07-05
1979-10-30
Wintercorn, Richard A.
Photocopying
Contact printing
Light boxes
354 60L, 355 1, G03B 1720
Patent
active
041726464
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 divided 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: 3280714 (1966-10-01), Gunther et al.
patent: 3521542 (1970-07-01), De Goederen
Canon Kabushiki Kaisha
Wintercorn Richard A.
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