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Image forming apparatus

  • US 6,122,075 A
  • Filed: 10/15/1997
  • Issued: 09/19/2000
  • Est. Priority Date: 10/28/1996
  • Status: Expired due to Fees
First Claim
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1. An image forming apparatus of the electrophotographic type for performing feedback control with a plurality of electrophotographic parameters as manipulated variables so that a controlled variable for image quality becomes a target value, and for making said controlled variable stable with respect to predetermined environmental fluctuation in a predetermined stable area of a predetermined first electrophotographic parameter, and further for varying said controlled variable in said stable area of said first electrophotographic parameter by a predetermined second electrophotographic parameter, said image forming apparatus comprising:

  • means for setting said target value for said controlled variable;

    means for making a set value for said manipulated variable, variable;

    means for preparing a reference pattern while varying said first electrophotographic parameter over a range including said stable area, and varying said second electrophotographic parameter to set said controlled variable in said stable area to said target value;

    reference pattern measuring means for measuring said controlled variable for said reference pattern; and

    means for determining a value for said first electrophotographic parameter in the stable area on the basis of measured results by said reference pattern measuring means, and for further determining the value for said second parameter which causes said controlled variable in the value thus determined to correspond with said target value.

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