Ink concentration sensor for maintaining dye concentration in an

Details Ink concentration sensor for maintaining dye concentration in an Ink concentration sensor for maintaining dye concentration in an

1992-05-29

1993-08-31

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356435, 346140R, G01N 2140

Patent

active

052411893

ABSTRACT:
An ink concentration sensor maintains ink concentration in an ink jet printing system. The ink concentration sensor includes a transparent fluid chamber and an infrared light source for directing a beam of IR light at the fluid chamber. A first sensor is located for receiving IR light reflected from the surface of the chamber and providing a reference signal and a second sensor is located for receiving IR light transmitted through the chamber to produce a concentration signal. A circuit receives the reference signal and generates a corrected concentration signal.

REFERENCES:
patent: 3900396 (1975-08-01), Lamadrid
patent: 4609991 (1986-09-01), Minton et al.
patent: 4884065 (1989-11-01), Crouse et al.

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