Image density control apparatus for copying machines

Details Image density control apparatus for copying machines Image density control apparatus for copying machines

1984-07-13

1986-02-25

Moses, R. L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 55, 355 3R, G03G 1500

Patent

active

045726531

ABSTRACT:
There is disclosed an image density control apparatus for copying machines in which an area of a pattern image that is formed by projecting a reference pattern through an optical system is limited to a constant area irrespective of the copy magnification. Then the pattern image is developed and its toner density is detected to serve for controlling the image density. Accordingly, the image density is controlled with accuracy, irrespective of the copy magnification.

REFERENCES:
patent: 3901593 (1975-08-01), Kogiso et al.
patent: 3967896 (1976-07-01), Looney et al.
patent: 4348100 (1982-09-01), Snelling
patent: 4416535 (1983-11-01), Tottori

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