Patent ID: 6462821
Filing Date: 2002-10-08
Classification: G01N,G03G

Abstract:
In an optical developability sensing system with an optical sensor for measuring the density of imaging material on an imaging surface of a printer, wherein said optical sensor includes an illumination source for directing illumination to an imaging material sample on said imaging surface and a photosensor system for measuring the amount of reflected illumination therefrom,the improvement in said optical developability sensing system optical sensor wherein; said imaging material is partially specularly reflective and said reflected illumination from said imaging material sample has both specularly and diffusely reflected illumination, said photosensor system includes a first lens system with a first optical axis relative to said imaging material sample and a first photosensor optically associated with said first lens system receiving both said specularly and diffusely reflected illumination from said imaging material sample, a separate lenslet system positioned outside of said first lens system and substantially laterally optically offset at a substantially greater angle from said first optical axis of said first lens system relative to said imaging material sample, a separate second photosensor optically associated with said separate lenslet system, said separate lenslet system and said optically associated separate second photosensor being optically adapted to only receive diffusely reflected light from said imaging material sample on said imaging surface, even though said reflected illumination from said imaging material sample has both specularly and diffusely reflected illumination from said partially specularly reflective imaging material.