JP2005157194A5 - - Google Patents

Claims (12)

A conductive support;
A solid conductive elastic layer provided on the conductive support;
It met charging member having <br/> the conductive elastic layer a conductive resin layer provided on the outer periphery of,
Loss coefficient eta is eta> 0.1 and Do that a static-members represented by the following formula (1).

(In the above formula (1), _{E 1} is the modulus of elasticity of said solid conductive elastic layer (MPa), _{E 2} is the modulus of elasticity of the conductive resin layer (MPa), _{t 1} is the solid conductive elastic layer the thickness of the ([mu] m), _{t 2} is the thickness of the conductive resin layer (μm), tanδ ₂ shows the tan [delta (15 ℃) at a temperature 15 ℃ obtained from viscoelasticity measurement of the conductive resin layer.) The charging member according to claim 1, wherein an elastic modulus E _{1 of the} solid conductive elastic layer is 0.5 <E ₁ (MPa) <5.0. The thickness _{t 1} of the solid conductive elastic layer _{500 <t 1 (μm) <} 1500 der Ru請 Motomeko 1 or 2 charging member according to. The charging member according to any one of the conductive resin layer elastic modulus _{E 2} is 1000 _<E 2 (MPa) _<7000 der Ru請 Motomeko 1-3. The charging member according to any one of the electrically thickness _{t 2} of the conductive resin layer is _{5 <t 2 (μm) <} 50 Der Ru請 Motomeko 1-4. The charging member according to any one of tan [delta ₂ is 0.05 <tan [delta ₂ der Ru請 Motomeko 1-5 at the measuring temperature 15 ℃ obtained from viscoelasticity measurement of the conductive resin layer. The conductive resin layer has 10 to 30 mass% containing insulating particles relative to the total weight of the conductive resin layer, the weight average particle diameter on a volume basis obtained from the volume distribution of the insulating particles 5 the charging member according to any one of 25μm der Ru請 Motomeko 1-6. The charging member according to any one of the ten-point average roughness of the charging member (Rz) is 5 <Rz (μm) <25 Der Ru請 Motomeko 1-7. The insulating particles, elastic spherical particles comprising a crosslinked type A acrylic resin, or, Oh Ru請 Motomeko 1 with elastic spherical particles comprising a crosslinked type acrylic Le / styrene emissions copolymer resin The charging member according to claim 8. An electrophotographic photosensitive member, disposed in contact with the electrophotographic photosensitive member, and a belt conductive member which Ru is charging the electrophotographic photosensitive member integrally supported by applying a voltage, detachably to the main body of the electrophotographic apparatus A process cartridge comprising :
A process cartridge, wherein the charging member is the charging member according to claim 1 . Forming an electrophotographic photosensitive member, disposed in contact with the electrophotographic photosensitive member, and a static-member Ru is charging the electrophotographic photosensitive member by applying a voltage, an exposure means for forming a latent image, a toner image a developing means for, an to that electronic photographic device and a transfer means for transferring to a transfer material the toner image,
An electrophotographic apparatus, wherein the charging member is the charging member according to claim 1 . The electrophotographic apparatus according to claim 11 having a charging bias application voltage source you apply a voltage of a DC voltage only to said charging member.