Photocopying – Contact printing – Light boxes
Patent
1988-04-18
1989-05-09
Moses, R. L.
Photocopying
Contact printing
Light boxes
355214, 118689, G03G 1506
Patent
active
048293369
ABSTRACT:
A patch sensing toner concentration control method and apparatus is provided in which the optical density of reproduction output can be changed without changing the quantity of toner that is deposited on the photoconductor's test patch area. The test patch area receives toner as the patch area passes through a developer station under the influence of a patch development electrical field or vector. Light that is reflected from a bare photoconductor area is compared to light that is reflected from a toned test patch area. The ratio of these two reflected light intensities is used to control the addition of toner to the developer station. Optical density of the reproduction output is changed by changing the toner concentration in the developer station. The toner concentration control method and apparatus of the invention is constructed and arranged to require a fixed or constant ratio of light reflection as an indication of proper toner concentration, independent of the absolute value of toner concentration. Toner concentration, and thereby optical density of reproduction output, is changed by changing the magnitude of the patch development vector, while maintaining the reproduction development vector constant.
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Champion James R.
Sartin Darrel E.
International Business Machines - Corporation
Moses R. L.
Rohrer Charles E.
Sirr Francis A.
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