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Electrophotographic image forming apparatus which controls developer bias based on image irregularity

  • US 5,227,842 A
  • Filed: 03/20/1992
  • Issued: 07/13/1993
  • Est. Priority Date: 03/20/1991
  • Status: Expired due to Fees
First Claim
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1. An image forming apparatus comprising:

  • an image carrier;

    latent image forming means for electrostatically forming a latent image on said image carrier;

    developing means for conveying a two-component type developer made up of a toner and a carrier to a developing region where a developer carrier faces said image carrier and transfers said developer to said image carrier, and forming a bias electric field for development having an alternating electric field in said developing region to convert said latent image to a toner image;

    reference latent image forming means for forming a predetermined reference latent image on said image carrier;

    irregularity detecting means for detecting, after said developing means has developed said reference latent image to produce a reference toner image, a degree of difference in density between an edge and a central portion of said reference toner image; and

    bias electric field control means for controlling said bias electric field in response to an output of said irregularity detecting means.

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