Automatic compensation for densitometer imbalance

Details Automatic compensation for densitometer imbalance Automatic compensation for densitometer imbalance

1974-07-23

1976-07-20

McGraw, Vincent P.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

250559, 356206, 356212, G01J 346, G01N 2148

Patent

active

039703932

ABSTRACT:
A method for compensating measurements of optical density of ink printed by a printing press in which amounts of light reflected from a printed test patch area and from an adjacent unprinted reference area are measured. The measurement sensitivity of sensing apparatus for measuring light from the printed test area need not be equal to the measurement sensitivity of sensing apparatus for measuring light from the unprinted reference area because the relative sensitivities of the two sensing apparatuses are ascertained before the press starts printing. The relative sensitivities are ascertained by making preliminary measurements of light from areas known to have equal reflection densities, for example unprinted paper. The results of these preliminary measurements are stored in a memory and employed later automatically to compensate density measurements based on readings made by the two sensing apparatuses while the press is printing.

REFERENCES:
patent: 3748046 (1973-07-01), Murray
patent: 3756725 (1973-09-01), Manring

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