Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorKota Mori
Life of this patent
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Abstract
An image forming apparatus includes an image bearing member configured to bear an image and a charging roller to which a direct current voltage is applied and which is configured to charge a surface of the image bearing member. The charging roller includes a shaft member, an elastic layer formed around the shaft member, and a surface layer formed around the elastic layer. Particles having particle diameters within a range of 2 μm or larger and 15 μm or smaller are dispersed in the surface layer. A maximum height Sz (μm) and an autocorrelation length Sal (μm) with respected to the surface layer of the charging roller satisfy 8≤Sz≤16 and 13≤Sal≤30.
Claims12
An image forming apparatus comprising:
- an image bearing member configured to bear an image;
- and
- a charging roller to which a direct current voltage is applied and which is configured to charge a surface of the image bearing member,
- wherein the charging roller comprises a shaft member, an elastic layer formed around the shaft member, and a surface layer formed around the elastic layer,
- wherein particles having particle diameters of 2 μm to 15 μm are dispersed in the surface layer, and
- wherein a maximum height Sz (μm) and an autocorrelation length Sal (μm) with respect to the surface layer of the charging roller satisfy 8<Sz<16 and 13<Sal <30.
An image forming apparatus comprising:
- an image bearing member configured to bear an image;
- and
- a charging roller to which a direct current voltage is applied and which is configured to charge a surface of the image bearing member,
- wherein the charging roller comprises a shaft member, an elastic layer formed around the shaft member, and a surface layer formed around the elastic layer,
- wherein first particles having an average particle diameter D1 (μm) and second particles having an average particle diameter D2 (μm) smaller than D1 are dispersed in the surface layer,
- wherein a pair (D1, D2) of the average particle diameter D1 of the first particles and the average particle diameter D2 of the second particles satisfies D1<20 and 3<D2<(D1)/2 simultaneously, and
- wherein a maximum height Sz (μm) and an autocorrelation length Sal (μm) with respect to the surface layer of the charging roller satisfy 8<Sz<16 and 13<Sal <30.
Dependencies are inferred from the claim text.