Apparatus for detecting image density in an image-forming machin

Details Apparatus for detecting image density in an image-forming machin Apparatus for detecting image density in an image-forming machin

1987-03-06

1989-01-03

Grimley, A. T.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 14D, G03G 1500

Patent

active

047960655

ABSTRACT:
An apparatus for detecting image density in an image forming machine includes a first sensor for receiving mainly a regular reflecting light reflected from a reference toner image, and a second sensor for receiving mainly scattered reflecting light reflected from the reference toner image. The output signals from each sensor are compared with each other so as to produce a differential signal. Upon presetting the difference signal to be nil for a predetermined image density, an increase or a decrease of the reference toner image will invite a change of plus/minus sign of the differential signal.

REFERENCES:
patent: 4313671 (1982-02-01), Kuru
patent: 4505572 (1985-03-01), Ashida et al.
patent: 4525630 (1985-06-01), Chapman
patent: 4676653 (1987-06-01), Strohmeier et al.
patent: 4677298 (1987-06-01), Zelmanovic et al.

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