Optics: measuring and testing – With plural diverse test or art
Patent
1996-05-30
1997-09-09
Font, Frank G.
Optics: measuring and testing
With plural diverse test or art
356448, 356445, 399 9, 399 53, 399 74, G01N 2155, G03G 2100
Patent
active
056661940
ABSTRACT:
An apparatus which detects a mass of marking material developed on a test patch recorded on a photoconductive surface. The apparatus includes a densitometer, a capacitor sensor and a controller. The densitometer is spaced from and adjacent to the photoconductive surface. The capacitor sensor is also positioned adjacent to the photoconductive surface and spaced therefrom. In operation, the densitometer generates a first signal proportional to the specular component of the total reflectivity of the material deposited on the test patch developed on the photoconductive surface. The capacitor sensor generates a second signal proportional to the mass of material developed on the test patch recorded on the surface. In response to these signals, the controller generates a first control signal as a function of the first signal received from the densitometer in response to the mass of material deposited on the test patch being less than a preselected mass. When the mass deposited on the test patch is greater than the preselected mass, the controller generates a second control signal as a function of the second signal received from the capacitor sensor. In this way, a continuous signal is transmitted from the controller independent of the color of the material developed on the test patch.
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Beck J. E.
Fleischer H.
Font Frank G.
Stafira Michael P.
Xerox Corporation
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