Development roller
AssigneeSumitomo Rubber Industries, Ltd.
InventorDaijiro Suzuki
Life of this patent
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Abstract
Provided is a development roller which is capable of improving a black solid density and a 2-dot density simultaneously to form a satisfactory image with excellent contrast and thin line reproducibility. A development roller includes a roller body that contains a tubular inner layer consisting of an elastic material and an outer layer consisting of an elastic material, a roller resistance value R1 (Ω, an applied voltage of 400 V) in a state when there is only the inner layer satisfies formula (1): 6.5≤log R1≤9.5 (1), and a volume resistivity R2 (Ω·cm, an applied voltage of 400 V) in a state when there is only the outer layer satisfies formula (2): log R2≤9.0 (2).
Claims12
A development roller comprising a roller body, wherein the roller body comprises a tubular inner layer which consists of an elastic material and an outer layer which consists of an elastic material and is laminated on an outer periphery surface of the inner layer, the outer layer consists of a cross-linked product of a rubber composition, wherein the rubber composition of the outer layer contains an epichlorohydrin rubber and a diene rubber, and a roller resistance value R1 (Ω, an applied voltage of 400 V) in a state when there is only the inner layer satisfies formula (1):
- 6.5≤log R1≤9.5 (1),
- and a volume resistivity R2 (Ω·cm, an applied voltage of 400 V) in a state when there is only the outer layer satisfies formula (2):
- log R2≤9.0 (2).
Dependencies are inferred from the claim text.