ELECTROSTATIC CHARGING MEMBER, PROCESS CARTRIDGE AND IMAGE FORMING DEVICE

Japanese Patent JP3080125

B2

PURPOSE: To prevent the unequal electrostatic charge of the contact electrostatic charging member and to eliminate image defects.
CONSTITUTION: An arbor 2a is enclosed by an elastic material 2B laminated, successively from an inner side, with a foamed member 2b, a tube 2c, a conductive layer 2d, a middle resistance layer 2e and an protective layer 2f, thereby a electrostatic charging roller 2 is constituted. Both ends of this arbor 2a are pressed by pressurizing springs to press the electrostatic charging roller 2 to an image carrying member 1 and an electrostatic bias is impressed to the arbor 2a by a power source 4, by which the surface of the image carrying member 1 is uniformly electrostatically charged via the elastic material 2B. Both ends (only the one end is shown in Fig.) of the tube 2c are provided with tapered parts 2c' (angle α) converging toward the arbor 2a on the inner side. As a result, the relief of the pressure of foaming from the apertures at both ends is prevented at the time of foaming of the foamed member 2b. The hardness and volumetric resistivity of the foamed member 2b are uniformalized over the entire area in the longitudinal direction of the electrostatic charging roller 2, by which the unequal electrostatic charge is eliminated.

Hiroshi Sato
Kazushige Sakurai
Junichi Kato
Kouichi Suwa
Satoshi Inami
Masaki Ojima
Tetsuya Sano

JP20881093A

August 21, 2000

July 30, 1993

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Canon Inc

G03G21/16; G03G15/02; G03G21/18; (IPC1-7): G03G15/02

JP1191880A
JP1134477A
JP5131569A
JP592466A

Kazuo Chikajima

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