Toner concentration sensor

Details Toner concentration sensor Toner concentration sensor

G - Physics

03

G

314/37

G03G 15/06 (2006.01) G03G 15/08 (2006.01)

Patent

CA 1160278

ABSTRACT The present invention is an apparatus for monitoring toner concen- tration on a photoreceptor surface. The apparatus includes a light emitting diode, the phototransistor, a beam splitter, and a lens disposed between the beam splitter and the photoreceptor surface to collimate the light beam between the lens and the photoreceptor surface. A portion of the light emitted from the LED is transmitted through the beam splitter and the lens to the photoreceptor surface. Collimated light is reflected from the photoreceptor surface back through the lens and reflected from the beam splitter to the phototransistor. The output signal from the phototransistor because of the incident and reflected collimated light is independent of the distance of the lens from the photoreceptor surface. Alternately, a second lens is disposed between the beam splitter and the phototransistor to enhance overall resolution.

386768

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