Filming attenuation correcting toner concentration sensor assemb

Electrophotography – Diagnostics – Consumable

Patent

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Details

118691, 356436, G03G 2100

Patent

active

056781261

ABSTRACT:
A filming attenuation correcting toner concentration sensor assembly and method of controlling in a container, a concentration of a mixture that includes a light absorbing substance and a clear liquid carrier in solution, while correcting the effects of container filming. The method includes the steps of splitting light from a single light source having a controllable intensity, into a first light beam and a separate second light beam; focusing the first light beam through a first quantity of the mixture contained in a first light transmitting container made of a first material and having a first thickness, as well as focusing the second light beam through a second quantity of the mixture contained in a second light transmitting container made of the first material and having a second thickness greater than the first thickness of the first light transmitting container; generating a first proportional output signal by sensing with a first photodiode, a first attenuated light transmitted from the first light beam through the first light transmitting container and through the first quantity of the mixture; generating a second proportional output signal by sensing with a second photodiode, a second attenuated light transmitted from the second light beam through the second light transmitting container and through the second quantity of the mixture; maintaining the second proportional output signal at a constant level by adjusting the controllable intensity of the single light source; and adjusting the concentration of the light absorbing substance in the mixture such that a filming-effect independent ratio that is equal to the first proportional output signal divided by the second proportional output signal, is also maintained as a constant, thereby achieving a toner concentration of the mixed developer material that is maintained at a desired level, without the undesirable effects of filming of optical surfaces.

REFERENCES:
patent: 4551004 (1985-11-01), Paraskevopoulos
patent: 4950905 (1990-08-01), Butler et al.
patent: 4980727 (1990-12-01), Stelter
patent: 4981362 (1991-01-01), de Jong et al.
patent: 5083165 (1992-01-01), Landa
patent: 5119132 (1992-06-01), Butler
patent: 5208637 (1993-05-01), Landa

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