Cleaning blade, process cartridge, and electrophotographic apparatus
AssigneeCanon Kabushiki Kaisha
InventorsMasanobu Nakajima, Norihiko Kubo, Hisataka Hisakuni, Masaya Kawada, Kenji Karashima
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Abstract
A cleaning blade includes an image region and a non-image region in which Young's moduli at positions separated by a distance of L μm from an edge portion in contact with an photosensitive drum are respectively defined as YL and Y′L, Y0 and Y′0 are 10 mgf/μm2 or more and 400 mgf/μm2 or less, Y50/Y0 is 0.5 or less, [{(Y0−Y20)/Y0}/(20−0)] is equal to or more than [{(Y20−Y50)/Y0}/(50−20)] and, the Young's modulus Y50 ≦the Young's modulus Y′L where L satisfies 0≦L ≦100 μm.
Claims16
A cleaning blade that is formed of urethane rubber and is in contact with an image-carrying member carrying a toner image to clean the image-carrying member, the cleaning blade comprising:
- a first surface that faces the image-carrying member and is orthogonal to a thickness direction of the cleaning blade;
- and
- a second surface that forms, together with the first surface, an edge portion that is in contact with the image-carrying member,
- wherein at least a portion of the second surface is cured so as to satisfy relationships below:
- 10 mgf/μm2≦Y0≦400 mgf/μm2
- 0<Y50/Y0≦0.5
- {(Y20−Y50)/Y0}/(50−20)≦{(Y0−Y20)/Y0}/(20−0)
- 10 mgf/μm2≦Y′0≦400 mgf/μm2
- Y50≦Y′L where with respect to all Ls satisfying 0≦L≦100 μm
- where
- Y0:
- Young's modulus of the edge portion in a region of the second surface, the region corresponding to an image-forming region in which an image is formed in the image-carrying member in a direction orthogonal to a direction that the image-carrying member conveys a toner image
- Y50:
- Young's modulus at a position 50 μm separated from the edge portion in a region of the second surface, the region corresponding to the image-forming region
- Y20:
- Young's modulus at a position 20 μm separated from the edge portion in a region of the second surface, the region corresponding to the image-forming region
- Y′0:
- Young's modulus of the edge portion in a region of the second surface, the region is in an edge portion side than the image-forming region and corresponding to a non-image-forming region in which no image is formed in the image-carrying member in a direction orthogonal to a direction that the image-carrying member conveys a toner image
- L:
- distance from the edge portion of the second surface
- Y′L:
- Young's modulus at a position L μm separated from the edge portion in a region of the second surface, the region corresponding to the non-image-forming region.
A cleaning blade that is formed of urethane rubber and is in contact with an image-carrying member carrying a toner image to clean the image-carrying member, the cleaning blade comprising:
- a first surface that faces the image-carrying member and is orthogonal to a thickness direction of the cleaning blade;
- and
- a second surface that forms, together with the first surface, an edge portion that is in contact with the image-carrying member,
- wherein at least a portion of the first surface is cured so as to satisfy relationships below:
- 10 mgf/μm2≦Yc0≦400 mgf/μm2
- 0<Yc50/Yc0≦0.5
- {(Yc20−Yc50)/Yc0}/(50−20)≦{(Yc0−Yc20)/Yc0}/(20−0)
- Yc100<Yc′100
- where
- Yc0:
- Young's modulus of the edge portion in a region of the first surface, the region corresponding to an image-forming region in which an image is formed in the image-carrying member in a direction orthogonal to a direction that the image-carrying member conveys a toner image
- Yc50:
- Young's modulus at a position 50 μm separated from the edge portion in a region of the first surface, the region corresponding to the image-forming region
- Yc20:
- Young's modulus at a position 20 μm separated from the edge portion in a region of the first surface, the region corresponding to the image-forming region
- Yc100:
- Young's modulus at a position 100 μm separated from the edge portion in a region of the first surface, the region corresponding to the image-forming region
- Yc'100:
- Young's modulus at a position 100 μm separated from the edge portion in a region of the first surface, the region is in an edge portion side than the image-forming region and corresponding to a non-image-forming region in which no image is formed in the image-carrying member in a direction orthogonal to a direction that the image-carrying member conveys a toner image.
Dependencies are inferred from the claim text.