Photocopying – Contact printing – Light boxes
Patent
1990-04-02
1990-12-25
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355208, G03G 2100
Patent
active
049807277
ABSTRACT:
Apparatus and method for controlling the toner concentration of developer mixtures in electrostatographic devices. Light is reflected from the developer and the light reflectance ratio is converted to electrical signals by a two-path circuit. Both the gain and offset of a circuit amplifier are controllable to allow for optimum response to carriers of different reflectivities. The gain is set depending upon the desired sensitivity and the offset voltage is set to establish the output voltage at a predetermined point for the particular carrier and toner being used.
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Eastman Kodak Company
Grimley A. T.
Hoffman Sandra L.
Sales Milton S.
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