Electrophotography – Image formation – Development
Patent
1997-12-18
1999-12-28
Braun, Fred L.
Electrophotography
Image formation
Development
399 29, G03G 1501
Patent
active
060092939
ABSTRACT:
An image forming apparatus having a revolving type developing device including a plurality of monochrome developing members for developing a latent image formed on an image carrier with monochrome developer and a plurality of toner storing members for separately storing different toners. The apparatus includes a plurality of toner supplying members disposed in the revolving type developing device for supplying toner from one of the toner storing members to a corresponding one of the plurality of monochrome developing members. A plurality of density sensors are separately disposed in each of the monochrome developing members for sensing density of monochrome developer and generating a signal indicative of density of the monochrome developer. A light beam generating member is disposed inside the revolving type developing device for generating and irradiating a light beam with a density signal obtained by one of the density sensors. A light beam receiving member receives the light beam from the light beam generating member and is disposed at a portion of a body of the image forming apparatus in which the light beam receiving member faces the light beam generating member. A controller controls one of the toner supplying members to supply toner to a corresponding monochrome developing member facing the image carrier to keep a density of the monochrome developer stored in the monochrome developing member within a predetermined range based upon the signal received by the light beam receiving member.
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Braun Fred L.
Ricoh & Company, Ltd.
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