Method of detecting toner concentration in electrophotographic c

Details Method of detecting toner concentration in electrophotographic c Method of detecting toner concentration in electrophotographic c

1979-06-05

1981-06-16

Welsh, John D.

Radiation imagery chemistry: process, composition, or product th

Including control feature responsive to a test or measurement

430120, 118691, 118665, 118653, 355 3DD, G03G 1508

Patent

active

042738431

ABSTRACT:
An apparatus and method for detecting the concentration of toner in a multi-component developer of an electrophotographic copying machine utilizes a source of illumination for projecting light onto the developer, and a receiving element for measuring the intensity of light of a predetermined wavelength reflected from the developer, the predetermined wavelength being of a value selected to maximize the intensity of reflected light in response to variations in toner concentration substantially independently of the reflection characteristics of the developer. The amount or concentration of toner in the developer is varied--by the addition of suitable amounts of toner--with the measured intensity of the received reflection of light of the predetermined wavelength.

REFERENCES:
patent: 3892672 (1975-07-01), Gawron
patent: 3897748 (1975-08-01), Hirata

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