CHARGING MEMBER, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC APPARATUS
First Claim
1. A charging member comprising an electro-conductive substrate and an electro-conductive resin layer, whereinthe electro-conductive resin layer includes a binder, a plurality of bowl-shaped resin particles, and a plurality of hollow particles;
- the charging member has a surface having recesses defined by openings of the bowl-shaped resin particles and protrusions defined by edges of the openings of the bowl-shaped resin particles; and
the electro-conductive resin layer satisfies a positional relationship between the bowl-shaped resin particles and the hollow particles defined by requirement (1);
requirement (1);
at least 4.0 hollow particles existing within a region, the region being defined by orthographic projection of the bowl-shaped resin particle from the surface of the electro-conductive resin layer toward the depth direction, and being betweenan outer wall surface of a shell forming the recess of the bowl-shaped resin particle, anda plane M2 which is parallel to the surface of the electro-conductive substrate and is passing through a point p2 at a distance d of b/(1+√
2) (μ
m) in the depth direction, from a point p1 at a deepest position of the outer wall surface of the shell, where the symbol b in “
b/(1+√
2)”
represents a particle diameter (μ
m) of the bowl-shaped resin particle by spherical approximation.
1 Assignment
0 Petitions
Accused Products
Abstract
A charging member includes an electro-conductive substrate and an electro-conductive resin layer. The electro-conductive resin layer contains a binder, a plurality of bowl-shaped resin particles, and a plurality of hollow particles. The charging member has a surface having recesses due to openings of the bowl-shaped resin particles and protrusions due to edges of the openings of the bowl-shaped resin particles, where the positional relationship between one bowl-shaped resin particle and the hollow particles lying in the vicinity of the bowl-shaped resin particle is that the number of the hollow particles being in the space under the bowl-shaped resin particle in a predetermined depth is at least four in average.
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Citations
5 Claims
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1. A charging member comprising an electro-conductive substrate and an electro-conductive resin layer, wherein
the electro-conductive resin layer includes a binder, a plurality of bowl-shaped resin particles, and a plurality of hollow particles; -
the charging member has a surface having recesses defined by openings of the bowl-shaped resin particles and protrusions defined by edges of the openings of the bowl-shaped resin particles; and the electro-conductive resin layer satisfies a positional relationship between the bowl-shaped resin particles and the hollow particles defined by requirement (1); requirement (1);
at least 4.0 hollow particles existing within a region, the region being defined by orthographic projection of the bowl-shaped resin particle from the surface of the electro-conductive resin layer toward the depth direction, and being betweenan outer wall surface of a shell forming the recess of the bowl-shaped resin particle, and a plane M2 which is parallel to the surface of the electro-conductive substrate and is passing through a point p2 at a distance d of b/(1+√
2) (μ
m) in the depth direction, from a point p1 at a deepest position of the outer wall surface of the shell, where the symbol b in “
b/(1+√
2)”
represents a particle diameter (μ
m) of the bowl-shaped resin particle by spherical approximation. - View Dependent Claims (2, 3)
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4. A process cartridge detachably attachable to a main body of an electrophotographic apparatus, comprising a charging member, wherein the charging member comprises an electro-conductive substrate and an electro-conductive resin layer, wherein
the electro-conductive resin layer includes a binder, a plurality of bowl-shaped resin particles, and a plurality of hollow particles; -
the charging member has a surface having recesses defined by openings of the bowl-shaped resin particles and protrusions defined by edges of the openings of the bowl-shaped resin particles; and the electro-conductive resin layer satisfies a positional relationship between the bowl-shaped resin particles and the hollow particles defined by requirement (1); requirement (1);
at least 4.0 hollow particles existing within a region, the region being defined by an orthographic projection of the bowl-shaped resin particle from the surface of the electro-conductive resin layer toward a depth direction, and being betweenan outer wall surface of a shell forming the recess of the bowl-shaped resin particle, and a plane M2 which is parallel to the surface of the electro-conductive substrate and is passing through a point P2 at a distance d of b/(1+√
2) (μ
m) in the depth direction, from a point p1 at a deepest position of the outer wall surface of the shell, where the symbol b in “
b/(1+√
2)”
represents a particle diameter (μ
m) of the bowl-shaped resin particle by spherical approximation.
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5. An electrophotographic apparatus comprising a charging member, an exposure device, and a developing device, wherein the charging member comprises an electro-conductive substrate and an electro-conductive resin layer, wherein
the electro-conductive resin layer contains a binder, a plurality of bowl-shaped resin particles, and a plurality of hollow particles; -
the charging member has a surface having recesses defined by openings of the bowl-shaped resin particles and protrusions defined by edges of the openings of the bowl-shaped resin particles; and the electro-conductive resin layer satisfies a positional relationship between the bowl-shaped resin particles and the hollow particles defined by requirement (1); requirement (1);
at least 4.0 hollow particles existing within a region, the region being defined by an orthographic projection of the bowl-shaped resin particle from the surface of the electro-conductive resin layer toward a depth direction, and being betweenan outer wall surface of a shell forming the recess of the bowl-shaped resin particle, and a plane M2 which is parallel to the surface of the electro-conductive substrate and is passing through a point P2 at a distance d of b/(1+√
2) (μ
m) in the depth direction, from a point p1 at the deepest position of the outer wall surface of the shell, where the symbol b in “
b/(1+√
2)”
represents a particle diameter (μ
m) of the bowl-shaped resin particle by spherical approximation.
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Specification