Densitometer for an electrophotographic printer using focused an

Details Densitometer for an electrophotographic printer using focused an Densitometer for an electrophotographic printer using focused an

1992-05-18

1993-04-20

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356448, G01N 2186

Patent

active

052045382

ABSTRACT:
An apparatus measures the reflectivity of a selected region of a surface. A first light beam is reflected from the selected region and substantially focused on a photodetector. A second light beam is reflected from the selected region and is substantially unfocused on the photodetector. A signal is derived representative of the direct reflectance of light reflected from the surface onto the photodetector as a function of the intensities of the focused light beam and the unfocused light beam detected by the photodetector.

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patent: 5122672 (1992-06-01), Mansour

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