Developer sensing system and control

Details Developer sensing system and control Developer sensing system and control

1977-02-03

1979-05-22

Corbin, John K.

Optics: measuring and testing

By particle light scattering

With photocell detection

118646, 355 3DD, 356445, G01N 2100

Patent

active

041556526

ABSTRACT:
A system is disclosed which will sense the image-development state of toner in the development subsystem of an electrophotographic copier apparatus. This image-development state is related to both toner concentration and the charge-to-mass ratio (q/m) existing on toner particles. The sensing system employs an optical fiber bundle having both transmitting and receiving fibers. At one end, herein referred to as the common end, and transmitting and receiving fibers are interspersed. This common end is positioned flush with the inside chamber wall on a developer housing. At the other end, the transmitting and receiving fibers are bifurcated. The transmitting fibers of the optical bundle are used to guide light from a light source to the common end, and part of the transmitted light is backscattered and guided through the receiving fibers to an optical sensor. The signal received is inversely proportional to the amount of toner deposited on the end of the bundle and the toner on the surface of carrier particles. This signal can be used to control the amount of toner added to the developer subsystem at any given time.

REFERENCES:
patent: 3610205 (1971-10-01), Rarey et al.
patent: 3784309 (1974-01-01), Brelot et al.
Birth, "A Fiber Optics Reflectance Attachment", Agricultural Engineering, pp. 448, 449, Aug., 1967.

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