Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1975-01-22
1977-01-11
Griffin, Robert L.
Facsimile and static presentation processing
Facsimile
Recording apparatus
178DIG28, 350 7, G02D 1700, H04M 584
Patent
active
040028305
ABSTRACT:
Inherent defects in the angular relationship between facets of a rotating polygonal mirror used to sequentially scan a beam of radiation are corrected by an optical reflecting or refracting element pivotally mounted in the path of the radiation. With the use of electromechanical devices energized by timed electrical signals of appropriate value, the mirror or refracting element is pivoted to correct the scanning errors caused by angular defects in the rotating mirror. The effect of variations in the angles between facets of the polygonal mirror are also corrected by an electronic circuit which includes a delay device capable of delaying the scanning by a predetermined amount. Control means for the electromechanical devices and for the delay device are pre-programmed so as to make the proper adjustments for each facet of the rotating polygonal mirror.
REFERENCES:
patent: 3461227 (1969-08-01), Perreault
patent: 3465352 (1969-09-01), Carlson
patent: 3809806 (1974-05-01), Walker
Brown John Buchanan
Gardiner Frank J.
Coles Edward L.
Griffin Robert L.
Laser Graphic Systems Corporation
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