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ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC APPARATUS

  • US 20080304864A1
  • Filed: 07/24/2008
  • Published: 12/11/2008
  • Est. Priority Date: 03/27/2007
  • Status: Active Grant
First Claim
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1. An electrophotographic photosensitive member comprising a photosensitive layer on a support, whereinthe electrophotographic photosensitive member has 100 or more depressed portions which are independent from one another per unit area (100 μ



  • 100 μ

    m) over the whole surface of a surface layer;

    where the minor axis diameter of the depressed portions is Rpc and the depth indicating the distance between the innermost part of a depressed portion and the opening surface thereof is Rdv, the depressed portions have a ratio of depth to minor axis diameter (Rdv/Rpc) of 1.0 or less; and

    the photosensitive layer comprises a hole transporting material with an ionization potential of 4.5 eV or more and 5.3 eV or less.

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