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Image forming apparatus using a contact or a proximity type of charging system

  • US 20040213600A1
  • Filed: 02/03/2004
  • Published: 10/28/2004
  • Est. Priority Date: 02/18/2003
  • Status: Active Grant
First Claim
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1. An image forming apparatus comprising:

  • a movable body to be charged; and

    a charger comprising a charging member contacting or adjoining said body to be charged and configured to apply a voltage, including an AC component, to said charging member for thereby charging said body;

    wherein a protection substance for protecting a surface of said body from deterioration ascribable to charging is caused to exist on said body, and wherein a ratio (%) of a number of particular elements, contained in the protection substance and detected by an X-ray photon spectral analyzer (XPS) in a zone where said charging member charges said body, to a total number of all elements constituting an outermost surface of said body and detected by said XPS is expressed as;

    1.52×

    10

    4
    ×

    {Vpp−



    Vth}×

    f/v×

    N
    α

    where Vpp denotes a peak-to-peak voltage (V) of an AC voltage, f denotes a frequency (Hz) of the AC component applied to said charging member, v denotes a moving speed (mm/sec) of the surface of said body, N denotes the number of, among elements constituting the protection substance, the particular elements in a single molecule, and Vth denotes a discharge start voltage produced by;

    Vth=312+6.2×

    (d/ε

    opc+Gp/ε

    air)+{square root}(77.37.6×

    d/ε

    opc) where d denotes a film thickness (μ

    m) of said body, ε

    opc denotes a specific dielectric constant of said body, ε

    air denotes a specific dielectric constant of a space between said body and said charging member, and Gp denotes a smallest distance (μ

    m) between a surface of said charging member and the surface of said body.

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