Electro-conductive roll and image-forming apparatus using the same
First Claim
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1. An electro-conductive roll that makes contact with a body to be charged in a state in which a voltage is applied to the roll, and charges the body to be charged, wherein a surface of the electro-conductive roll satisfies the following conditions (a) and (b):
- (a) the surface of the electro-conductive roll has a 10-point average roughness of 5 μ
m or less; and
(b) the surface of the electro-conductive roll has a dynamic ultra-microhardness in the range of 0.04 to 0.5; and
whereinthe electro-conductive roll includes, on an electro-conductive substrate, at least two electro-conductive layers comprised of at least an electro-conductive elastic layer and an electro-conductive surface layer, and the electro-conductive elastic layer is formed by dispersing an electro-conductive agent in a rubber material; and
the electro-conductive elastic layer and the electro-conductive surface layer satisfy the following relationship (c);
(c) (Rz of a surface of the electro-conductive elastic layer)×
0.5≦
thickness of the electro-conductive surface layer≦
(Rz of a surface of the elastic layer)×
2.
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Abstract
An electro-conductive roll is provided that makes contact with a body to be charged in a state in which a voltage is applied thereto, and charges the body to be charged, a surface of the electro-conductive roll satisfying the following conditions (a) and (b):
- (a) the surface of the electro-conductive roll has a 10-point average roughness of 5 μm or less; and
- (b) the surface of the electro-conductive roll has a dynamic ultra-microhardness in the range of 0.04 to 0.5.
8 Citations
18 Claims
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1. An electro-conductive roll that makes contact with a body to be charged in a state in which a voltage is applied to the roll, and charges the body to be charged, wherein a surface of the electro-conductive roll satisfies the following conditions (a) and (b):
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(a) the surface of the electro-conductive roll has a 10-point average roughness of 5 μ
m or less; and(b) the surface of the electro-conductive roll has a dynamic ultra-microhardness in the range of 0.04 to 0.5; and
whereinthe electro-conductive roll includes, on an electro-conductive substrate, at least two electro-conductive layers comprised of at least an electro-conductive elastic layer and an electro-conductive surface layer, and the electro-conductive elastic layer is formed by dispersing an electro-conductive agent in a rubber material; and
the electro-conductive elastic layer and the electro-conductive surface layer satisfy the following relationship (c);(c) (Rz of a surface of the electro-conductive elastic layer)×
0.5≦
thickness of the electro-conductive surface layer≦
(Rz of a surface of the elastic layer)×
2. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An electro-conductive roll that makes contact with a body to be charged in a state in which a voltage is applied to the roll, and charges the body to be charged, wherein a surface of the electro-conductive roll satisfies the following conditions (a) and (b):
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(a) the surface of the electro-conductive roll has a 10-point average roughness of 5 μ
m or less;(b) the surface of the electro-conductive roll has a dynamic ultra-microhardness in the range of 0.04 to 0.5; and wherein the electro-conductive roll includes, on an electro-conductive substrate, at least two electro-conductive layers comprised of at least an electro-conductive elastic layer and an electro-conductive surface layer, and the electro-conductive elastic layer is formed by dispersing an electro-conductive agent in a rubber material; and
the electro-conductive elastic layer and the electro-conductive surface layer satisfy the following relationship (c);(c) (Rz of a surface of the electro-conductive elastic layer)×
0.5≦
thickness of the electro-conductive surface layer≦
(Rz of a surface of the elastic layer)×
2;the surface layer includes at least one type of polymer material selected from the group consisting of polyamide, polyurethane, polyvinylidene fluoride, ethylene tetrafluoride copolymer, polyester, polyimide, silicone resin, acrylic resin, polyvinyl butyral, ethylene tetrafluoroethylene copolymer, melamine resin, fluoro rubber, epoxy resin, polycarbonate, polyvinyl alcohol, cellulose, polyvinylidene chloride, polyvinyl chloride, polyethylene, and ethylene-vinyl acetate copolymer; and the surface layer includes at least one type of electrically conductive material selected from the group consisting of fine grains of an electronic conductive agent, and an ionic conductive agent; wherein the electro-conductive roll is a charging roll.
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9. An electro-conductive roll that makes contact with a body to be charged in a state in which a voltage is applied to the roll, and charges the body to be charged, wherein a surface of the electro-conductive roll satisfies the following conditions (a) and (b):
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(a) the surface of the electro-conductive roll has a 10-point average roughness of 5 μ
m or less; and(b) the surface of the electro-conductive roll has a dynamic ultra-microhardness in the range of 0.04 to 0.5; and wherein the electro-conductive roll is a transfer roll.
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10. An electro-conductive roll that makes contact with a body to be charged in a state in which a voltage is applied to the roll, and charges the body to be charged, wherein a surface of the electro-conductive roll satisfies the following conditions (a) and (b):
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(a) the surface of the electro-conductive roll has a 10-point average roughness of 5 μ
m or less;(b) the surface of the electro-conductive roll has a dynamic ultra-microhardness in the range of 0.04 to 0.5; and wherein the electro-conductive roll includes, on an electro-conductive substrate, at least two electro-conductive layers comprised of at least an electro-conductive elastic layer and an electro-conductive surface layer, and the electro-conductive elastic layer is formed by dispersing an electro-conductive agent in a rubber material; and
the electro-conductive elastic layer and the electro-conductive surface layer satisfy the following relationship (c);(c) (Rz of a surface of the electro-conductive elastic layer)×
0.5≦
thickness of the electro-conductive surface layer≦
(Rz of a surface of the elastic layer)×
2;the surface layer includes at least one type of polymer material selected from the group consisting of polyamide, polyurethane, polyvinylidene fluoride, ethylene tetrafluoride copolymer, polyester, polyimide, silicone resin, acrylic resin, polyvinyl butyral, ethylene tetrafluoroethylene copolymer, melamine resin, fluoro rubber, epoxy resin, polycarbonate, polyvinyl alcohol, cellulose, polyvinylidene chloride, polyvinyl chloride, polyethylene, and ethylene-vinyl acetate copolymer; and the surface layer includes at least one type of electrically conductive material selected from the group consisting of fine grains of an electronic conductive agent, and an ionic conductive agent; wherein the electro-conductive roll is a transfer roll.
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11. An electro-conductive roll that makes contact with a body to be charged in a state in which a voltage is applied to the roll, and charges the body to be charged, wherein a surface of the electro-conductive roll satisfies the following conditions (a) and (b):
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(a) the surface of the electro-conductive roll has a 10-point average roughness of 5 μ
m or less; and(b) the surface of the electro-conductive roll has a dynamic ultra-microhardness in the range of 0.04 to 0.5; and
wherein the electro-conductive roll is a cleaning roll.
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12. An electro-conductive roll that makes contact with a body to be charged in a state in which a voltage is applied to the roll, and charges the body to be charged, wherein a surface of the electro-conductive roll satisfies the following conditions (a) and (b):
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(a) the surface of the electro-conductive roll has a 10-point average roughness of 5 μ
m or less;(b) the surface of the electro-conductive roll has a dynamic ultra-microhardness in the range of 0.04 to 0.5; and wherein the electro-conductive roll includes, on an electro-conductive substrate, at least two electro-conductive layers comprised of at least an electro-conductive elastic layer and an electro-conductive surface layer, and the electro-conductive elastic layer is formed by dispersing an electro-conductive agent in a rubber material; and
the electro-conductive elastic layer and the electro-conductive surface layer satisfy the following relationship (c);(c) (Rz of a surface of the electro-conductive elastic layer)×
0.5≦
thickness of the electro-conductive surface layer≦
(Rz of a surface of the elastic layer)×
2;the surface layer includes at least one type of polymer material selected from the group consisting of polyamide, polyurethane, polyvinylidene fluoride, ethylene tetrafluoride copolymer, polyester, polyimide, silicone resin, acrylic resin, polyvinyl butyral, ethylene tetrafluoroethylene copolymer, melamine resin, fluoro rubber, epoxy resin, polycarbonate, polyvinyl alcohol, cellulose, polyvinylidene chloride, polyvinyl chloride, polyethylene, and ethylene-vinyl acetate copolymer; and the surface layer includes at least one type of electrically conductive material selected from the group consisting of fine grains of an electronic conductive agent, and an ionic conductive agent; wherein the electro-conductive roll is a cleaning roll.
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13. An electro-conductive roll that makes contact with a body to be charged in a state in which a voltage is applied to the roll, and charges the body to be charged, wherein a surface of the electro-conductive roll satisfies the following conditions (a) and (b):
-
(a) the surface of the electro-conductive roll has a 10-point average roughness of 5 μ
m or less; and(b) the surface of the electro-conductive roll has a dynamic ultra-microhardness in the range of 0.04 to 0.5; and
wherein the electro-conductive roll includes, on an electro-conductive substrate, two or more electro-conductive layers comprised of at least an electro-conductive elastic layer and an electro-conductive surface layer, and the electro-conductive elastic layer and the electro-conductive surface layer satisfy the following conditions (d) and (e);(d) a surface of the electro-conductive elastic layer has an Rz of 5 μ
m or less; and(e) the electro-conductive surface layer has a film thickness of 3 μ
m to 15 μ
m. - View Dependent Claims (14, 15, 16, 17)
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18. An image forming apparatus comprising:
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a photoreceptor; a charging device that charges the photoreceptor; an exposure device that exposes the charged photoreceptor and forms an electrostatic latent image; a developing device that develops the electrostatic latent image with a toner; and a transfer device that transfers a toner image to a receiving medium; wherein the charging device, in a state where voltage is applied thereto, comes into contact with the photoreceptor, and comprises an electro-conductive roll that charges the photoreceptor, wherein a surface of the electro-conductive roll satisfies the following conditions (a) and (b); (a) the surface of the electro-conductive roll has a 10-point average roughness (Rz) of 5 μ
m or less; and(b) the surface of the electro-conductive roll has a dynamic ultra-microhardness in the range of 0.04 to 0.5; and wherein the electro-conductive roll includes, on an electro-conductive substrate, two or more electro-conductive layers comprised of at least an electro-conductive elastic layer and an electro-conductive surface layer, and the electro-conductive elastic layer and the electro-conductive surface layer satisfy the following conditions (d) and (e); (d) a surface of the electro-conductive elastic layer has an Rz of 5 μ
m or less; and(e) the electro-conductive surface layer has a film thickness of 3 μ
m to 15 μ
m.
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Specification
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Current AssigneeFuji Xerox Company Limited (Xerox Holdings Corp.)
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Original AssigneeFuji Xerox Company Limited (Xerox Holdings Corp.)
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InventorsMiura, Hiroyuki, Takayama, Hiroshi, Watanabe, Ryuji, Rokutan, Minoru, Kouda, Ryusei, Hattori, Takahiko
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Primary Examiner(s)Chen, Sophia S.
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Application NumberUS10/803,892Publication NumberTime in Patent Office837 DaysField of Search399/174, 399/168, 399/352, 399/357, 399/176, 399/313, 361/221, 361/216, 430/902, 492/28US Class Current399/176CPC Class CodesG03G 15/0233 Structure, details of the c...
