US5606401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Charging device including movable charging brush contactable to member to be charged, and image forming apparatus using same
Assignee: Canon Inc
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Filing: 1995-11-13
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Granted: 1997-02-25
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Expires: 2015-11-13
Abstract
Abstract A charging device includes a movable member to be charged having a surface charge injection layer with a volume resistivity of 1×10 10 -1×10 14 Ωcm, and a charging member for charging the member to be charged, the charging member including a movable charging brush contactable with the member to be charged and supplied with a voltage. The movable member is driven such that the following relationship is satisfied, N(Vk-Vb)/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 surface 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. The charging member may include a movable conductive particle layer instead of a charging brush.
Inventors
- 👤 Hideyuki Yano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:27
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: 60
Claim 1
Independent Claim
132 words
A charging device comprising: a movable member to be charged having a surface charge injection layer with a volume resistivity of 1×10 10 -1×10 14 Ωcm; a charging member for charging said member to be charged, said charging member including a movable charging brush comprising fibers contactable with said member to be charged and supplied with a voltage; and wherein said movable member is driven such that the following relationship is satisfied: N(Vk-Vb)/Vb>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 surface 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
132 words
A charging device comprising: a movable member to be charged having a surface charge injection layer with a volume resistivity of 1×10 10 -1×10 14 Ωcm; a charging member for charging said member to be charged, said charging member including a movable charging brush comprising fibers contactable with said member to be charged and supplied with a voltage; and wherein said movable member is driven such that the following relationship is satisfied: N(Vk-Vb)/Vb>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 surface 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 3
Dependent Claim
21 words
A device according to claim 1, wherein said charge injection layer comprises an insulative binder and conductive fine particles dispersed therein.
Claim 4
Dependent Claim
13 words
A device according to claim 2, wherein the conductive fine particles are light-transmissive.
Claim 5
Dependent Claim
15 words
A device according to claim 2, wherein said conductive fine particles comprise SnO 2 .
Claim 6
Dependent Claim
38 words
A device according to claim 1, wherein the following relationship is satisfied: ##EQU1## where R (fibers/mm 2 ) is a fiber density of the charging brush, and D (mm) is a diameter of fibers of the charging brush.
Claim 7
Dependent Claim
13 words
A device according to claim 5, wherein the following is satisfied: 10≦R≦800 0.005≦D≦0.250.
Claim 8
Dependent Claim
19 words
A device according to claim 1, wherein said. charging member has a resistance of 1×10 4 -1×10 7 Ω.
Claim 9
Dependent Claim
13 words
A device according to claim 1, wherein the voltage is a DC voltage.
Claim 10
Dependent Claim
148 words
A process cartridge detachably mountable to an image forming apparatus, comprising: a movable member to be charged having a surface charge injection layer with a volume resistivity of 1×10 10 -1×10 14 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 charging brush comprising fibers contactable with said member to be charged and supplied with a voltage; and wherein said movable member is driven such that the following relationship is satisfied: N(Vk-Vb)/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 surface 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 11
Dependent Claim
148 words
A process cartridge detachably mountable to an image forming apparatus, comprising: a movable member to be charged having a surface charge injection layer with a volume resistivity of 1×10 10 -1×10 14 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 charging brush comprising fibers contactable with said member to be charged and supplied with a voltage; and wherein said movable member is driven such that the following relationship is satisfied: N(Vk-Vb)/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 surface 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 12
Dependent Claim
21 words
A process cartridge according to claim 9, further comprising a developing device for developing the member to be charged with toner.
Claim 13
Dependent Claim
40 words
A process cartridge according to claim 9 or 10, wherein the following is satisfied: ##EQU2## where R (fibers/mm 2 ) is a fiber density of the charging brush, and D (mm) is a diameter of fibers of the charging brush.
Claim 14
Dependent Claim
153 words
An image forming apparatus comprising: a movable member to be charged having a surface charge injection layer with a volume resistivity of 1×10 10 -1×10 14 Ωcm, said surface layer being capable of bearing an image; a charging member for charging said member to be charged, said charging member inducing a movable charging brush comprising fibers 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 said movable member is driven such that the following relationship is satisfied: N(Vk-Vb)/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 surface 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 15
Dependent Claim
153 words
An image forming apparatus comprising: a movable member to be charged having a surface charge injection layer with a volume resistivity of 1×10 10 -1×10 14 Ωcm, said surface layer being capable of bearing an image; a charging member for charging said member to be charged, said charging member inducing a movable charging brush comprising fibers 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 said movable member is driven such that the following relationship is satisfied: N(Vk-Vb)/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 surface 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 16
Dependent Claim
43 words
An apparatus according to claim 12, wherein said charging brush comprises fibers and the following is satisfied: ##EQU3## where R (fibers/mm 2 ) is a fiber density of the charging brush, and D (mm) is a diameter of fibers of the charging brush.
Claim 17
Dependent Claim
17 words
An apparatus according to claim 12, wherein said member to be charged comprises an organic photoconductive layer.
Claim 18
Dependent Claim
133 words
A charging device comprising: a movable member to be charged having a surface charge injection layer with a volume resistivity of 1×10 10 -1×10 14 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 said movable member is driven such that the following relationship is satisfied: N(Vk-Vb)/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 surface 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
133 words
A charging device comprising: a movable member to be charged having a surface charge injection layer with a volume resistivity of 1×10 10 -1×10 14 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 said movable member is driven such that the following relationship is satisfied: N(Vk-Vb)/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 surface 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 20
Dependent Claim
21 words
A device according to claim 15, wherein said charge injection layer comprises an insulative binder and conductive fine particles dispersed therein.
Claim 21
Dependent Claim
13 words
A device according to claim 16, wherein the conductive fine particles are light-transmissive.
Claim 22
Dependent Claim
15 words
A device according to claim 16, wherein said conductive fine particles comprise SnO 2 .
Claim 23
Dependent Claim
27 words
A device according to claim 15, wherein the following is satisfied: 0.9×D×80<N(Vk-Vb)/Vk where D (mm) is a particle size of conductive particles of said conductive particle layer.
Claim 24
Dependent Claim
8 words
A device according to claim 19, wherein 0.001≦D≦0.1.
Claim 25
Dependent Claim
18 words
A device according to claim 15 or 19, wherein conductive particles of said conductive particle layer are magnetic.
Claim 26
Dependent Claim
19 words
A device according to claim 15, wherein said charging member has a resistance of 1×10 4 -1×10 7 Ω.
Claim 27
Dependent Claim
13 words
A device according to claim 15, wherein the voltage is a DC voltage.
Claim 28
Dependent Claim
149 words
A process cartridge detachably mountable to an image forming apparatus comprising: a movable member to be charged having a surface charge injection layer with a volume resistivity of 1×10 10 -1×10 14 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 said movable member is driven such that the following relationship is satisfied: N(Vk-Vb)/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 surface 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 29
Dependent Claim
149 words
A process cartridge detachably mountable to an image forming apparatus comprising: a movable member to be charged having a surface charge injection layer with a volume resistivity of 1×10 10 -1×10 14 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 said movable member is driven such that the following relationship is satisfied: N(Vk-Vb)/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 surface 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 30
Dependent Claim
21 words
A process cartridge according to claim 24, further comprising a developing device for developing said member to be charged with toner.
Claim 31
Dependent Claim
30 words
A process cartridge according to claim 24 or 25, wherein the following is satisfied: 0.9×D×80<N(Vk-Vb)/Vk where D (mm) is a particle size of conductive particles of said conductive particle layer.
Claim 32
Dependent Claim
143 words
An image forming apparatus comprising: a movable member to be charged having a surface charge injection layer with a volume resistivity of 1×10 10 -1×10 14 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 said movable member is driven such that the following relationship is satisfied: N(Vk-Vb)/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 surface 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 33
Dependent Claim
143 words
An image forming apparatus comprising: a movable member to be charged having a surface charge injection layer with a volume resistivity of 1×10 10 -1×10 14 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 said movable member is driven such that the following relationship is satisfied: N(Vk-Vb)/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 surface 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 34
Dependent Claim
29 words
An image forming apparatus according to claim 27, wherein the following is satisfied: 0.9×D×80<N(Vk-Vb)/Vk where D (mm) is a particle size of conductive particles of said conductive particle layer.
Claim 35
Dependent Claim
16 words
An apparatus according to claim 27, wherein said member to be charged comprises an organic photoconductor.
Claim 36
Dependent Claim
116 words
A charging device comprising: a movable member to be charged; a charging member for charging said member to be charged, said charging member including a movable charging brush comprising fibers contactable with said member to be charged and supplied with a voltage; and wherein said movable member is driven such that the following relationship is satisfied: N(Vk-Vb)/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 surface 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 37
Dependent Claim
116 words
A charging device comprising: a movable member to be charged; a charging member for charging said member to be charged, said charging member including a movable charging brush comprising fibers contactable with said member to be charged and supplied with a voltage; and wherein said movable member is driven such that the following relationship is satisfied: N(Vk-Vb)/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 surface 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 38
Dependent Claim
37 words
A device according to claim 30, wherein the following is satisfied: ##EQU4## where R (fibers/mm 2 ) is a fiber density of the charging brush, and D (mm) is a diameter of fibers of the charging brush.
Claim 39
Dependent Claim
13 words
A device according to claim 31, wherein the following is satisfied: 10≦R≦800 0.005≦D≦0.250.
Claim 40
Dependent Claim
19 words
A device according to claim 30, wherein said charging member has a resistance of 1×10 4 -1×10 7 Ω.
Claim 41
Dependent Claim
13 words
A device according to claim 30, wherein the voltage is a DC voltage.
Claim 42
Dependent Claim
18 words
A device according to claim 30, wherein the member to be charged is provided with a photosensitive member.
Claim 43
Dependent Claim
134 words
A process cartridge detachably mountable to an image forming apparatus, comprising: a movable member to be charged, said member to be charged being capable of bearing an image; a charging member for charging said member to be charged, said charging member including a movable charging brush comprising fibers contactable with said member to be charged and supplied with a voltage; and wherein said movable member is driven such that the following relationship is satisfied: N(Vk-Vb)/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 surface 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 44
Dependent Claim
134 words
A process cartridge detachably mountable to an image forming apparatus, comprising: a movable member to be charged, said member to be charged being capable of bearing an image; a charging member for charging said member to be charged, said charging member including a movable charging brush comprising fibers contactable with said member to be charged and supplied with a voltage; and wherein said movable member is driven such that the following relationship is satisfied: N(Vk-Vb)/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 surface 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 45
Dependent Claim
21 words
A process cartridge according to claim 36, further comprising a developing device for developing the member to be charged with toner.
Claim 46
Dependent Claim
40 words
A process cartridge according to claim 36 or 37, wherein the following is satisfied: ##EQU5## where R (fibers/mm 2 ) is a fiber density of the charging brush, and D (mm) is a diameter of fibers of the charging brush.
Claim 47
Dependent Claim
19 words
A process cartridge according to claim 36, wherein the member to be charged is provided with a photosensitive member.
Claim 48
Dependent Claim
117 words
A charging device comprising: a movable member to be charged; 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 said movable member is driven such that the following relationship is satisfied: N(Vk-Vb)/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 surface 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 49
Dependent Claim
117 words
A charging device comprising: a movable member to be charged; 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 said movable member is driven such that the following relationship is satisfied: N(Vk-Vb)/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 surface 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 50
Dependent Claim
27 words
A device according to claim 40, wherein the following is satisfied: 0.9×D×80<N(Vk--Vb)/Vk where D (mm) is a particle size of conductive particles of said conductive particle layer.
Claim 51
Dependent Claim
8 words
A device according to claim 41, wherein 0.001≦D≦0.1.
Claim 52
Dependent Claim
14 words
A device according to claim 40 or 41, wherein the conductive particles are magnetic.
Claim 53
Dependent Claim
19 words
A device according to claim 40, wherein said charging member has a resistance of 1×10 4 -1×10 7 Ω.
Claim 54
Dependent Claim
13 words
A device according to claim 40, wherein the voltage is a DC voltage.
Claim 55
Dependent Claim
18 words
A device according to claim 40, wherein the member to be charged is provided with a photosensitive member.
Claim 56
Dependent Claim
135 words
A process cartridge detachably mountable to an image forming apparatus comprising: a movable member to be charged, said member to be charged 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 said movable member is driven such that the following relationship is satisfied: N(Vk-Vb)/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 surface of said conductive particle layer, and N (m/n) 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 57
Dependent Claim
135 words
A process cartridge detachably mountable to an image forming apparatus comprising: a movable member to be charged, said member to be charged 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 said movable member is driven such that the following relationship is satisfied: N(Vk-Vb)/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 surface of said conductive particle layer, and N (m/n) 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 58
Dependent Claim
21 words
A process cartridge according to claim 47, further comprising a developing device for developing said member to be charged with toner.
Claim 59
Dependent Claim
30 words
A process cartridge according to claim 47 or 48, wherein the following is satisfied: 0.9×D×80<N(Vk-Vb)/Vk where D (mm) is a particle size of conductive particles of said conductive particle layer.
Claim 60
Dependent Claim
19 words
A process cartridge according to claim 47, wherein the member to be charged is provided with a photosensitive member.
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