Automatic image density control apparatus

Details Automatic image density control apparatus Automatic image density control apparatus

1988-03-10

1989-10-31

Hix, L. T.

Photocopying

Contact printing

Light boxes

355214, 355246, G03B 1500

Patent

active

048780820

ABSTRACT:
An automatic image density control apparatus, wherein an original placed on a document table and a reference image pattern provided on one edge of the document table and having a image portion or half-tone portion and a non-image portion are scanned, and by way of an exposure, their electrostatic latent images are formed on a photosensitive member on which the non-developing portion with no developer is also formed, and by means of a density sensor for detecting the image density, the initial image density of the non-developing portion and the image density which varies as the time elapses are detected and by the ratio of them, the image density of the image portion or half-tone portion and the non-image portion of the reference image pattern are corrected, and according to the respective preset reference values of the image portion or half-tone portion and non-image portion and their corrected image density, the image portion or half-tone portion density and the non-image portion density of an image are uniformly controlled.

REFERENCES:
patent: 4313671 (1982-02-01), Kuru
patent: 4571068 (1986-02-01), Tarumi et al.
patent: 4572654 (1986-02-01), Murai et al.

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