Method of forming images of sensor patterns in effecting image d

Details Method of forming images of sensor patterns in effecting image d Method of forming images of sensor patterns in effecting image d

1983-04-14

1985-11-05

Prescott, A. C.

Photocopying

Including fiber optics

355 3DD, 355 14D, 355 14E, 355 55, G03G 1500

Patent

active

045510059

ABSTRACT:
Forming a visible image of a sensor pattern on a photosensitive member for use in controlling image density of copies, wherein the sensor pattern of a reference density is placed substantially flush with a surface on which a document to be copied is placed; the surface of the photosensitive member is exposed to an optical image of the sensor pattern to form a latent image of the sensor pattern in a region of the photosensitive member outside a document image forming region; and the latent image is developed to obtain a visible image of the sensor pattern. The density sensed by a sensor element produces an electric signal used for controlling the density of an image. The region of the latent image of the sensor pattern is restricted to within a region of the surface of the photosensitive member on which an image of the sensor pattern would be formed when copying is performed at a minimum rate of reduction, by means of erasing an electric charge from the surface of the photosensitive member excepting the document image forming region and the region of the latent image of the sensor pattern by irradiation performed between the step of electrically charging and the step of developing. By this feature, it is possible to obtain pattern images of the same size both in an equal image size copying mode and an unequal image size copying mode to thereby eliminate errors that might otherwise be committed by the sensor element.

REFERENCES:
patent: 3649262 (1972-03-01), Cade et al.
patent: 4017170 (1977-04-01), Komori et al.
patent: 4313671 (1982-02-01), Kuru

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