Apparatus and method for facsimile scanning

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

1975-10-14

1977-08-02

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

350274, H04N 104

Patent

active

040400956

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 moving 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 general path of an Archemedian spiral thus providing a scanning system having improved resolutional characteristics.

REFERENCES:
patent: 1781866 (1930-11-01), Bahney
patent: 1800057 (1931-04-01), Donle
patent: 1826836 (1931-10-01), Stacho
patent: 1860967 (1932-05-01), Tate
patent: 2184525 (1939-12-01), Ives

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