Original reading apparatus

Details Original reading apparatus Original reading apparatus

1987-12-17

1990-03-06

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358464, H04M 140

Patent

active

049070975

ABSTRACT:
A document reading apparatus incorporating shading correction features has an illumination device for illuminating a document. Drive components move the document relative to the illumination device. Image pickup circuitry converts the image of the document irradiated by the illumination device into an electrical signal. A first stationary reference member is disposed on a reverse side with respect to the document and provides a first reference light to the image pickup circuitry when irradiated by the illumination device. A second stationary reference member is disposed on a front side with respect to the document and provides a second reference light to the image pickup circuitry when irradiated by the illumination device. Control circuitry corrects the electrical signal of the document image from the pickup circuitry in accordance with one of the first and second reference lights picked up by the pickup circuitry.

REFERENCES:
patent: 4578711 (1986-03-01), White et al.
patent: 4622594 (1986-11-01), Honjo et al.
patent: 4717963 (1988-01-01), Koizijmi

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