EP0615177A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Charging device, process cartridge and image forming apparatus
Assignee: Canon Inc
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Filing: 1994-03-01
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Granted: —
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Expires: 2014-03-01
Abstract
Abstract A charging device includes a movable member to be charged having a surface charge injection layer with a volume resistivity of 1x10¹⁰ - 1x10¹⁴ Ωcm; a charging member for charging the member to be charged, the charging member including movable charging brush contactable with the member to be charged and supplied with a voltage; and wherein N(Vb-Vk)/Vk ≧ 4, where Vk (mm/sec) is a movement speed of the surface of the member to be charged, Vb (mm/sec) is a movement speed of an outer peripheral of the charging brush, and N (mm) is a contact width between the member to be charged and the charging brush, measured in a movement direction of the member to be charged.
Inventors
- 👤 Hideyuki C/O Canon Kabushiki Kaisha Yano
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 03:35
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0208; G03G15/0216; G03G2215/00; G03G2215/02; G03G2215/021; G03G2215/022
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
117 words
A charging device comprising: a movable member to be charged having a surface charge injection layer with a volume resistivity of 1x10¹⁰ - 1x10¹⁴ Ωcm; a charging member for charging said member to be charged, said charging member including movable charging brush contactable with said member to be charged and supplied with a voltage; and wherein N(Vb-Vk)/Vk ≧ 4, where Vk (mm/sec) is a movement speed of the surface of said member to be charged, Vb (mm/sec) is a movement speed of an outer peripheral of said charging brush, and N (mm) is a contact width between said member to be charged and said charging brush, measured in a movement direction of said member to be charged.
Claim 2
Dependent Claim
38 words
A device according to Claim 1, wherein the following is satisfied: (1/√R-D) x 80 < N(Vb-Vk)/Vk where R (fibers/mm²) is fiber density of the charging brush, and D (mm) is a diameter of fibers of the charging brush.
Claim 3
Dependent Claim
21 words
A device according to Claim 2 wherein the following is satisfied: 10 ≦ R ≦ 800 0.005 ≦ D ≦ 0.250.
Claim 4
Dependent Claim
134 words
A process cartridge detachably mountable relative to an image forming apparatus, comprising: a movable member to be charged having a surface charge injection layer with a volume resistivity of 1x10¹⁰ - 1x10¹⁴ Ωcm, said surface layer being capable of bearing an image; a charging member for charging said member to be charged, said charging member including movable charging brush contactable with said member to be charged and supplied with a voltage; and wherein N(Vb-Vk)/Vk ≧ 4, where Vk (mm/sec) is a movement speed of the surface of said member to be charged, Vb (mm/sec) is a movement speed of an outer peripheral of said charging brush, and N (mm) is a contact width between said member to be charged and said charging brush, measured in a movement direction of said member to be charged.
Claim 5
Dependent Claim
41 words
A process cartridge according to Claim 4 or 5, wherein the following is satisfied: (1/√R-D) x 80 < N(Vb-Vk)/Vk where R (fibers/mm²) is fiber density of the charging brush, and D (mm) is a diameter of fibers of the charging brush.
Claim 6
Dependent Claim
138 words
An image forming apparatus comprising: a movable member to be charged having a surface charge injection layer with a volume resistivity of 1x10¹⁰ - 1x10¹⁴ Ωcm, said surface layer being capable of bearing an image; a charging member for charging said member to be charged, said charging member including movable charging brush contactable with said member to be charged and supplied with a voltage; and image forming means for forming an image on said surface layer; wherein N(Vb-Vk)/Vk ≧ 4, where Vk (mm/sec) is a movement speed of the surface of said member to be charged, Vb (mm/sec) is a movement speed of an outer peripheral of said charging brush, and N (mm) is a contact width between said member to be charged and said charging brush, measured in a movement direction of said member to be charged.
Claim 7
Dependent Claim
38 words
An apparatus according to Claim 6, wherein the following is satisfied: (1/√R-D) x 80 < N(Vb-Vk)/Vk where R (fibers/mm²) is fiber density of the charging brush, and D (mm) is a diameter of fibers of the charging brush.
Claim 8
Dependent Claim
17 words
An apparatus according to Claim 6, wherein said member to be charged comprises an organic photoconductive layer.
Claim 9
Dependent Claim
121 words
A charging device comprising: a movable member to be charged having a surface charge injection layer with a volume resistivity of 1x10¹⁰ - 1x10¹⁴ Ωcm; a charging member for charging said member to be charged, said charging member including a movable conductive particle layer contactable with said member to be charged and supplied with a voltage; and wherein N(Vb-Vk)/Vk ≧ 0.2 where Vk (mm/sec) is a movement speed of the surface of said member to be charged, Vb (mm/sec) is a movement speed of an outer peripheral of said conductive particle layer, and N (mm) is a contact width between said member to be charged and said conductive particle layer, measured in a movement direction of said member to be charged.
Claim 10
Dependent Claim
23 words
A device according to Claim 1 or 9, wherein said charge injection layer comprises an insulative binder and conductive fine particles dispersed therein.
Claim 11
Dependent Claim
29 words
A device according to Claim 9, wherein the following is satisfied: 0.9 x D x 80 < N(Vb-Vk)/Vk where D (mm) is a particle size of the conductive particles.
Claim 12
Dependent Claim
14 words
A device according to Claim 9 or 11, wherein the conductive particles are magnetic.
Claim 13
Dependent Claim
20 words
A device according to Claim 1 or 9, wherein said charging member has a resistance of 1x10⁴ -1 x10⁷ Ω.
Claim 14
Dependent Claim
15 words
A device according to Claim 1 or 9, wherein said voltage is a DC voltage.
Claim 15
Dependent Claim
15 words
A device according to Claim 2 or 10, wherein the conductive fine particles are light-transmissive.
Claim 16
Dependent Claim
15 words
A device according to Claim 2 or 10, wherein said fine conductive particles comprise SnO₂.
Claim 17
Dependent Claim
11 words
A device according to Claim 11,wherein 0.001 ≦ D ≦ 0.1.
Claim 18
Dependent Claim
138 words
A process cartridge detachably mountable relative to an image forming apparatus comprising: a movable member to be charged having a surface charge injection layer with a volume resistivity of 1x10¹⁰ - 1x10¹⁴ Ωcm, said surface layer being capable of bearing an image; a charging member for charging said member to be charged, said charging member including a movable conductive particle layer contactable with said member to be charged and supplied with a voltage; and wherein N(Vb-Vk)/Vk ≧ 0.2 where Vk (mm/sec) is a movement speed of the surface of said member to be charged, Vb (mm/sec) is a movement speed of an outer peripheral of said conductive particle layer, and N (mm) is a contact width between said member to be charged and said conductive particle layer, measured in a movement direction of said member to be charged.
Claim 19
Dependent Claim
23 words
A process cartridge according to Claim 9 or 18, further comprising a developing device for developing said member to be charged with toner.
Claim 20
Dependent Claim
32 words
A process cartridge according to Claim 18 or 19 wherein the following is satisfied: 0.9 x D x 80 < N(Vb-Vk)/Vk where D (mm) is a particle size of the conductive particles.
Claim 21
Dependent Claim
131 words
An image forming apparatus comprising: a movable member to be charged having a surface charge injection layer with a volume resistivity of 1x10¹⁰ - 1x10¹⁴ Ωcm, said surface layer being capable of bearing an image; a charging member for charging said member to be charged, said charging member including a movable conductive particle layer contactable with said member to be charged and supplied with a voltage; and wherein N(Vb-Vk)/Vk ≧ 0.2 where Vk (mm/sec) is a movement speed of the surface of said member to be charged, Vb (mm/sec) is a movement speed of an outer peripheral of said conductive particle layer, and N (mm) is a contact width between said member to be charged and said conductive particle layer, measured in a movement direction of said member to be charged.
Claim 22
Dependent Claim
31 words
An image forming apparatus according to Claim 21, wherein the following is satisfied: 0.9 x D x 80 < N(Vb-Vk)/Vk where D (mm) is a particle size of the conductive particles.
Claim 23
Dependent Claim
16 words
An apparatus according to Claim 21, wherein said member to be charged comprises an organic photoconductor.
References Cited (Backward Citations)
No citation records indexed.
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