Charging member for electrophotographic imaging apparatus
Provided are a charging member coupleable to an electrophotographic imaging apparatus. The charging member includes an electrically-conductive support body, an electrically-conductive elastomer layer stacked on a surface of the electrically-conductive support body, and an electrically-conductive resin layer stacked as an outermost layer on the electrically-conductive elastomer layer. The electrically-conductive resin layer includes a binder resin and particles comprising at least one type of particles selected from resin particles and inorganic particles, wherein a relative dielectric constant (εr1) of the binder resin is greater than or about equal to a relative dielectric constant (εr2) of at least one type of particles.
1. A charging member coupleable to an electrophotographic imaging apparatus, the charging member comprising:
an electrically-conductive support body;
an electrically-conductive elastomer layer stacked on a surface of the electrically-conductive support body; and
an electrically-conductive resin layer stacked as an outermost layer on the electrically-conductive elastomer layer, the electrically-conductive resin layer including
a binder resin, and
particles comprising a type of particles selected from resin particles and inorganic particles,
wherein a relative dielectric constant (εr1) of the binder resin is greater than or about equal to a relative dielectric constant (εr2) of the type of particles.
2. The charging member of claim 1 , wherein εr2 is in a range of about 1.5 to about 4.0.
3. The charging member of claim 1 , wherein a thickness of the electrically-conductive resin layer is in a range of about 0.5 μm to about 5.0 μm.
4. The charging member of claim 1 , wherein
a 10-point average roughness (RzJIS) of the electrically-conductive resin layer is in a range of about 5.0 μm to about 25.0 μm, and
an interparticle distance (Sm) of the particles is in a range of about 50 μm to about 250 μm.
5. The charging member of claim 1 , wherein an average particle diameter of the particles is in a range of about 5.0 μm to about 25.0 μm.
6. The charging member of claim 1 , wherein an amount of the particles included in the electrically-conductive resin layer is in a range of about 10 parts to about 50 parts by weight per 100 parts by weight of the binder resin.
7. The charging member of claim 1 , wherein the resin particles are olefin-based resin particles, and the inorganic particles are silica particles.
8. The charging member of claim 1 , wherein the inorganic particles have a porous structure.
9. The charging member of claim 1 , wherein an oil adsorption amount of the inorganic particles is in a range of about 30 ml/100 g to about 300 ml/100 g.
10. The charging member of claim 1 , wherein the resin particles include ultra-high-molecular-weight polyethylene.
11. An electrophotographic imaging apparatus comprising:
an electrophotographic photoconductor;
a charging member to charge the electrophotographic photoconductor, the charging member including:
an electrically-conductive support body;
an electrically-conductive elastomer layer stacked on a surface of the electrically-conductive support body; and
an electrically-conductive resin layer stacked as an outermost layer on the electrically-conductive elastomer layer,
the electrically-conductive resin layer includes
a binder resin, and
particles comprising a type of particles selected from resin particles and inorganic particles,
wherein a relative dielectric constant (εr1) of the binder resin is greater than or about equal to a relative dielectric constant (εr2) of the type of particles.
12. The electrophotographic imaging apparatus of claim 11 , wherein εr2 is about 1.5 to about 4.0.
13. The electrophotographic imaging apparatus of claim 11 , wherein a thickness of the electrically-conductive resin layer is in a range of about 0.5 μm to about 5.0 μm.
14. The electrophotographic imaging apparatus of claim 11 , wherein
a 10-point average roughness (RzJIS) of the electrically-conductive resin layer is a range of about 5.0 μm to about 25.0 μm, and
an interparticle distance (Sm) of the particles is in a range of about 50 μm to about 250 μm.
15. The electrophotographic imaging apparatus of claim 11 , wherein
an average particle diameter of the particles is in a range of about 5.0 μm to about 25.0 μm;
an amount of the particles included in the electrically-conductive resin layer is in a range of about 10 parts to about 50 parts by weight per 100 parts by weight of the binder resin;
the resin particles are olefin-based resin particles, and the inorganic particles are silica particles;
the inorganic particles have a porous structure;
an oil adsorption amount of the inorganic particles is in a range of about 30 ml/100 g to about 300 ml/100 g; and/or
a direct current voltage is applied to the charging member.