Charge roller of developing device for image forming apparatus

Details Charge roller of developing device for image forming apparatus Charge roller of developing device for image forming apparatus

2005-09-13

2005-09-13

Jimenez, Marc (Department: 3726)

Roll or roller

Concentric layered annulus

Specific composition

C492S059000, C492S048000

Reexamination Certificate

active

06942607

ABSTRACT:
A charge roller utilizes a foam rubber substance where epichlorohydrin oxide rubber and an acrylonitrile butadiene rubber are mixed at a ratio of5:95, or utilizing a crosslinking rubber substance made of epichlorohydrin oxide rubber and acrylonitrile butadiene rubber having a polar low molecular polymeric characteristic, thus allowing the charge roller to maintain a low volume resistivity of 107Ω cm to 108Ω cm. As a result, the surface of a photosensitive drum can be charged by a minimum charging voltage, to thereby significantly reduce an amount of ozone. Since a non-crosslinked low molecular polymeric substance existing at a resilient rubber is significantly reduced, the low molecular polymeric substance of the charge roller may not be migrated onto a surface of the photosensitive drum even if the charge roller is in contact with a photosensitive drum for a long time period during a stoppage of operation of an image forming apparatus. As a result, the charge roller may not cause an abnormal phenomenon on the surface of the photosensitive drum.

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