Device for detecting a toner concentration in a developing solut

Optics: measuring and testing – For light transmission or absorption – Of fluent material

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Details

118691, 250576, 354298, 355 10, 356442, 356246, G01N 2122, G01N 2126, G01N 110, G03D 1300

Patent

active

041667026

ABSTRACT:
A device for detecting toner concentration in a developing solution for developing an electrostatic image includes a casing having a small drainage hole formed at a top portion thereof so that a certain amount of a developing solution will always be present in the casing even when a tank containing a major portion of the developing solution used is made empty for some reason. A lamp and a lightsensitive element are mounted in the casing at locations below the drainage hole so that they may remain submerged in the solution within the casing at all times, thereby to prevent toner particles in the solution from adhering to the active surface of the former and hence errors in the detection due to the adhesion of toner particles. Alternatively, a pair of light transmission members in the form of bundles of optical fibers may be submerged in the solution within the casing, instead of the lamp and element, in order to allow the latter to be disposed externally of the casing.

REFERENCES:
patent: 2324304 (1943-07-01), Katzman
patent: 3369524 (1968-02-01), Fuhrer
patent: 3560099 (1971-02-01), Boe et al.
patent: 3712203 (1973-01-01), Kishi et al.

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