Ink concentration measuring and control and control circuit

Details Ink concentration measuring and control and control circuit Ink concentration measuring and control and control circuit

1993-05-04

1994-12-13

Rosenberger, Richard A.

Optics: measuring and testing

For light transmission or absorption

By comparison

356436, G01N 2159

Patent

active

053733665

ABSTRACT:
In an ink concentration measuring circuit, a light emitting diode emits light toward an ink cell. A first photo diode receives reflected light from the ink cell and provides a reference signal and a second photo diode receives direct light through the ink cell and provides an ink signal. A ratio of the reference signal to the ink signal is then calculated and used to determine a concentration of ink in the ink cell. Since changes in the ink temperature affect the ink concentration, the ink temperature may be measured and the result used to modify the ratio, compensating for the changes in ink temperature. Also, ink pressure may be measured and used to modify the ratio, compensating for changes in the dimensions of the ink cell.

REFERENCES:
patent: 3743430 (1973-07-01), Riggs
patent: 4224405 (1980-09-01), Hijikata
patent: 4337468 (1982-06-01), Mizuno
patent: 4776693 (1988-10-01), Imamura et al.
patent: 5241189 (1993-08-01), Vandagriff et al.

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