Apparatus and method for facsimile scanning

Details Apparatus and method for facsimile scanning Apparatus and method for facsimile scanning

H - Electricity

04

N

178/3

H04N 3/04 (2006.01) H04N 1/16 (2006.01)

Patent

CA 1054945

APPARATUS AND METHOD FOR FACSIMILE SCANNING ABSTRACT A selector disc defining a single revolution spiral aperture is concentrically rotated with a scanning disc defining four nested multiturn spiral apertures. An elongated fixed slit is positioned between the discs and as the discs rotate, an exposure aperture is defined by the slit and a selected scanning spiral, the aperture mov- ing linearly across the slit. The drive ratio between the discs is such that their relative positions advance so that adjacent scan lines are defined by alternate scanning spirals. Further, each scanning spiral is composed of a series of contiguous, arcuate segments forming in the gen- eral path of an Archemedian spiral thus providing a scanning system having improved resolutional characteristics. -1-

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