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Method for inspecting quality of core material for electrophotographic ferrite carrier

  • US 7,880,483 B2
  • Filed: 03/28/2008
  • Issued: 02/01/2011
  • Est. Priority Date: 03/30/2007
  • Status: Expired due to Fees
First Claim
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1. A method for inspecting a quality of a core material for an electrophotographic ferrite carrier, comprising:

  • measuring electrical impedances of the core material for the electrophotographic ferrite carrier in a frequency range to obtain a Cole-Cole plot in which a real part of each measured impedance is arranged in an X-axis and an imaginary part of each measured impedance is arranged in a Y-axis; and

    evaluating an average surface shape of particles of the core material for the electrophotographic ferrite carrier using the Cole-Cole plot and an equivalent circuit model to which the measured impedances are applied.

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