Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1978-04-10
1979-12-11
Braun, Fred L.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
356448, G03G 1500
Patent
active
041780957
ABSTRACT:
A system for checking copy quality variables within the image area of an electrophotographic machine. During a test cycle, quality is checked by producing sample test areas within the photoconductor image area ordinarily used for producing copies. Reflectance measurements are made on the sample test areas and compared to a dynamically floating reference achieved by a reflectance measurement from a cleaned portion within the image area of the photoconductor. The testing circuit is balanced so that the same reflectance voltage should be generated whether the single reflectivity-sensing device is viewing a sample test area or a cleaned reference area. The system checks for quality variables such as toner concentration, image voltage, and an abnormally low reflectance photoconductor and provides a partial check on its own fault-free condition during periods when it is not in use.
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Smith, G. L., "Toner Concentration Control", IBM Technical Disclosure Bulletin; vol. 19, No. 11; Apr. 1977, pp. 4078 and 4079.
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Champion James R.
Seigal Steven D.
Braun Fred L.
International Business Machines - Corporation
Rohrer Charles E.
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