Colored toner optical developability sensor with improved sensin

Radiant energy – Invisible radiant energy responsive electric signalling – With means to inspect passive solid objects

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250341, 355246, 356446, G03G 1500

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active

049509055

ABSTRACT:
A non-black colored toner DMA sensor arrangement includes a light emitting device for illuminating a toner/surface substrate with light of a wavelength to which colored toners are non-absorbing, and to which the imaging surface is either partially absorbing or transmissive. Light is reflected from the toner predominantly by either scattering or multiple reflections to produce a significant component of diffusely reflected light. A sensor is arranged for detection of the diffusely reflected light, at an angle that does not detect the specularly reflected component of reflected light. An increasing level of diffusely reflected light indicates an increased density of toner coverage per unit area.

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