Charging member, charging device and manufacture of charging roller
First Claim
1. A charging member for charging a body to be charged by bringing said charging member into contact with said body to be charged and impressing a voltage between said charging member and said body to be charged, wherein said charging member comprises an elastic layer, a resistance regulation layer provided on said elastic layer, and a skin layer provided on said resistance regulation layer, and said resistance regulation layer is formed from a resin composition prepared by blending an ion conductive substance having a molecular weight of 30 to 800 as a conductive agent in a low-resistance resin matrix having a resistance of 1×
- 104 to 1×
1010 Ω
·
cm.
1 Assignment
0 Petitions
Accused Products
Abstract
In order to obtain a charging member which is free of problems such as bleeding of a conductive agent and environment dependency, has little voltage dependency, and can be preferably used in a charging system of impressing only a DC voltage, there is provided a charging member comprising an elastic layer, a resistance regulation layer provided on the elastic layer, and a skin layer provided on the resistance regulation layer, wherein the resistance regulation layer is formed by use of a resin composition prepared by blending an ion conductive substance having a molecular weight of 30 to 800 as a conductive agent into a low-resistance resin matrix having a resistance of 1×104 to 1×1010 Ω·cm.
In the case of obtaining a charging roller by dipping rollers in a coating material to form coating films on the surfaces of the rollers, {circle over (1)} the temperature of the coating material at the time of a dipping treatment is appropriately controlled, {circle over (2)} the temperatures of the rollers at the time of the dipping treatment are appropriately controlled, or {circle over (3)} air-blowing conditions in blowing air to the rollers to dry the coating films are appropriately controlled, whereby a charging roller with high quality can be obtained securely and stably without generating problems on a production basis such as liquid sag of the coating material and unevenness of coating film thickness.
24 Citations
26 Claims
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1. A charging member for charging a body to be charged by bringing said charging member into contact with said body to be charged and impressing a voltage between said charging member and said body to be charged, wherein
said charging member comprises an elastic layer, a resistance regulation layer provided on said elastic layer, and a skin layer provided on said resistance regulation layer, and said resistance regulation layer is formed from a resin composition prepared by blending an ion conductive substance having a molecular weight of 30 to 800 as a conductive agent in a low-resistance resin matrix having a resistance of 1× - 104 to 1×
1010 Ω
·
cm. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- 104 to 1×
- 8. A method of manufacturing a charging roller comprising a step of dipping a roller in a coating material to form a coating film on the surface of the roller, wherein the dipping treatment is conducted while said coating material is kept at a substantially constant predetermined temperature in the range of 25 to 35°
- 14. A method of manufacturing a charging roller comprising a step of simultaneously dipping a plurality of rollers in a coating material to thereby form a coating on the surface of each roller, wherein the temperatures of said plurality of rollers immediately before dipping are kept to be substantially uniform over all said rollers.
- 22. A method of manufacturing a charging roller comprising a step of dipping rollers in a coating material to form a coating film on the surface of each roller, wherein said plurality of rollers provided on their surfaces with said coating films by the dipping operation are hung in substantially vertical direction, and air is blown from the lower side to the upper side of said rollers to thereby dry said coating films.
Specification