Patent US2477527A successfully refreshed from Google Patents.
Patent US5126913A successfully refreshed from Google Patents.
US5126913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Charging device with contactable charging means and an image forming apparatus having the charging means and a detachable process unit
Assignee: Canon Inc
•
Filing: 1991-08-29
•
Granted: 1992-06-30
•
Expires: 2011-08-29
Abstract
Abstract A charging device for charging a moving member to be charged includes charging device for being contacted to the member to be charged to charge the member; a voltage source for applying a vibratory voltage to the charging device; wherein the charging device includes a first layer contactable to the member to be charged, a second layer adjacent thereto wherein the first layer is a dielectric layer having a volume resistivity larger than that of the second layer.
Inventors
- 👤 Junji Araya
- 👤 Masanobu Saito
- 👤 Hiroki Kisu
- 👤 Yohji Tomoyuki
- 👤 Shunji Nakamura
- 👤 Noribumi Koitabashi
- 👤 Hiroyuki Adachi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:20
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0208; G03G15/0216; G03G15/0233
Claims Analysis
Total Claims: 88
Claim 1
Independent Claim
101 words
A charging device for charging a moving member to be charged, comprising: charging means for being contacted to the member to be charged to charge the member; means for applying a voltage to said charging means, wherein the voltage has a peak-to-peak voltage which is not less than twice of an absolute value of a charge starting voltage relative to the member; wherein said charging means includes a first layer contactable to the member to be charged, a second layer adjacent thereto wherein the first layer is a dielectric layer having a volume resistivity larger than that of the second layer.
Claim 2
Dependent Claim
101 words
A charging device for charging a moving member to be charged, comprising: charging means for being contacted to the member to be charged to charge the member; means for applying a voltage to said charging means, wherein the voltage has a peak-to-peak voltage which is not less than twice of an absolute value of a charge starting voltage relative to the member; wherein said charging means includes a first layer contactable to the member to be charged, a second layer adjacent thereto wherein the first layer is a dielectric layer having a volume resistivity larger than that of the second layer.
Claim 3
Dependent Claim
15 words
A device according to claim 1, wherein the voltage is superposed DC and AC voltage.
Claim 4
Dependent Claim
18 words
A device according to claim 1, wherein said charging means is in the form of a rotatable roller.
Claim 5
Dependent Claim
17 words
A device according to claim 1, wherein said charging means is in the form of a blade.
Claim 6
Dependent Claim
16 words
A device according to claim 3, wherein said charging means rotates following movement of the member.
Claim 7
Dependent Claim
18 words
A device according to claim 1, wherein the second layer of said charging means is a rubber layer.
Claim 8
Dependent Claim
20 words
A device according to claim 1 or 6, wherein the first layer of said charging means is a resin layer.
Claim 9
Dependent Claim
18 words
A device according to claim 7, wherein the first layer of said charging means is of nylon resin.
Claim 10
Dependent Claim
18 words
A device according to claim 6, wherein the first layer of said charging means is a rubber layer.
Claim 11
Dependent Claim
20 words
A device according to claim 6, wherein a core member is provided inside the second layer of said charging means.
Claim 12
Dependent Claim
18 words
A device according to claim 1, wherein the second layer of said charging means is a core member.
Claim 13
Dependent Claim
18 words
A device according to claim 11, wherein the first layer of said charging means is a rubber layer.
Claim 14
Dependent Claim
28 words
A device according to claim 1, wherein an impedance component of an electrostatic capacity of said charging means is smaller than an impedance component of a resistance thereof.
Claim 15
Dependent Claim
26 words
A device according to claim 13, wherein the electrostatic capacity of said charging means is larger than the electrostatic capacity of the member to be charged.
Claim 16
Dependent Claim
17 words
A device according to claim 1, wherein the member to be charged is an image bearing member.
Claim 17
Dependent Claim
15 words
A device according to claim 15, wherein said image bearing member is a photosensitive member.
Claim 18
Dependent Claim
75 words
A charging device for charging a moving member to be charged, comprising: charging means for being contacted to the member to be charged to charge the member; means for applying a vibratory voltage to the charging means; wherein said charging means includes a surface dielectric layer at a contact portion with the member, and the impedance component of the electrostatic capacity of said charging means is smaller than the impedance component of the resistance thereof.
Claim 19
Dependent Claim
75 words
A charging device for charging a moving member to be charged, comprising: charging means for being contacted to the member to be charged to charge the member; means for applying a vibratory voltage to the charging means; wherein said charging means includes a surface dielectric layer at a contact portion with the member, and the impedance component of the electrostatic capacity of said charging means is smaller than the impedance component of the resistance thereof.
Claim 20
Dependent Claim
24 words
A device according to claim 17, wherein the electrostatic capacity of said charging means is larger than that of the member to be charged.
Claim 21
Dependent Claim
17 words
A device according to claim 17, wherein the vibratory voltage is a superposed DC and AC voltage.
Claim 22
Dependent Claim
34 words
A device according to claim 17, wherein a peak-to-peak voltage of the vibratory voltage is not less than twice the absolute value of the charge starting voltage relative to the member to be charged.
Claim 23
Dependent Claim
18 words
A device according to claim 17, wherein said charging means is in the form of a rotatable roller.
Claim 24
Dependent Claim
17 words
A device according to claim 17, wherein said charging means is in the form of a blade.
Claim 25
Dependent Claim
19 words
A device according to claim 21, wherein said charging means rotates following movement of the member to be charged.
Claim 26
Dependent Claim
21 words
A device according to claim 17, wherein a layer behind the surface layer at the contact portion is a rubber layer.
Claim 27
Dependent Claim
20 words
A device according to claim 17 or 24, wherein the surface layer of said charging means is a resin layer.
Claim 28
Dependent Claim
19 words
A device according to claim 25, wherein the surface layer of said charging means is a nylon resin layer.
Claim 29
Dependent Claim
24 words
A device according to claim 24, wherein the surface layer at the contact portion with the member to be charged is a rubber layer.
Claim 30
Dependent Claim
16 words
A device according to claim 24, wherein a core member is provided behind the rubber layer.
Claim 31
Dependent Claim
17 words
A device according to claim 17, wherein the layer behind the surface layer is a core member.
Claim 32
Dependent Claim
18 words
A device according to claim 29, wherein the surface layer of said charging means is a rubber layer.
Claim 33
Dependent Claim
17 words
A device according to claim 17, wherein the member to be charged is an image bearing member.
Claim 34
Dependent Claim
15 words
A device according to claim 31, wherein said image bearing member is a photosensitive member.
Claim 35
Dependent Claim
113 words
A charging device for charging a moving member to be charged, comprising: charging means for being contacted to the member to be charged to charge the member; means for applying a voltage to said charging wherein said charging means includes a high resistance layer at a portion where it is contacted to the member to be charged, and the following is satisfied: ρl>E.sup.2 ×(0.1×10.sup.-3).sup.2 /P (ohm.m.sup.2) where ρ is a volume resistivity (ohm.m) of the high resistance layer, l (m) is a thickness of the high resistance layer, E is the voltage (V) applied by said voltage applying means, P is a capacity (W) of a voltage source of said voltage applying means.
Claim 36
Dependent Claim
113 words
A charging device for charging a moving member to be charged, comprising: charging means for being contacted to the member to be charged to charge the member; means for applying a voltage to said charging wherein said charging means includes a high resistance layer at a portion where it is contacted to the member to be charged, and the following is satisfied: ρl>E.sup.2 ×(0.1×10.sup.-3).sup.2 /P (ohm.m.sup.2) where ρ is a volume resistivity (ohm.m) of the high resistance layer, l (m) is a thickness of the high resistance layer, E is the voltage (V) applied by said voltage applying means, P is a capacity (W) of a voltage source of said voltage applying means.
Claim 37
Dependent Claim
13 words
A device according to claim 33, wherein said voltage is a vibratory voltage.
Claim 38
Dependent Claim
16 words
A device according to claim 34, wherein the voltage is a superposed DC and AC voltage.
Claim 39
Dependent Claim
18 words
A device according to claim 33, wherein said charging means is in the form of a rotatable roller.
Claim 40
Dependent Claim
19 words
A device according to claim 36, wherein said charging means rotates following movement of the member to be charged.
Claim 41
Dependent Claim
19 words
A device according to claim 33, wherein the high resistance layer of said charging means is a resin layer.
Claim 42
Dependent Claim
23 words
A device according to claim 33 or 38, wherein a rubber layer is provided behind the high resistance layer of said charging means.
Claim 43
Dependent Claim
20 words
A device according to claim 39, wherein a core member is provided behind the rubber layer of said charging means.
Claim 44
Dependent Claim
38 words
A device according to claim 33, wherein the high resistance layer of said charging means includes a resin layer at a portion of contact with the member to be charged, and a rubber layer behind the resin layer.
Claim 45
Dependent Claim
27 words
A device according to claim 41, wherein a rubber layer is provided behind the high resistance layer, and a core member is provided behind the rubber layer.
Claim 46
Dependent Claim
17 words
A device according to claim 41, wherein a core member is provided behind the high resistance layer.
Claim 47
Dependent Claim
15 words
A device according to claim 33, wherein the high resistance layer is a rubber layer.
Claim 48
Dependent Claim
27 words
A device according to claim 44, wherein a rubber layer is provided behind the high resistance layer, and a core member is provided behind the rubber layer.
Claim 49
Dependent Claim
17 words
A device according to claim 44, wherein a core member is provided behind the high resistance layer.
Claim 50
Dependent Claim
38 words
A device according to claim 33, wherein the high resistance layer is a dielectric layer, and wherein an impedance component of an electrostatic capacity of said charging means is smaller than an impedance component of a resistance thereof.
Claim 51
Dependent Claim
26 words
A device according to claim 47, wherein the electrostatic capacity of said charging means is larger than the electrostatic capacity of the member to be charged.
Claim 52
Dependent Claim
17 words
A device according to claim 33, wherein the member to be charged is an image bearing member.
Claim 53
Dependent Claim
15 words
A device according to claim 49, wherein said image bearing member is a photosensitive member.
Claim 54
Dependent Claim
237 words
A charging device for charging a moving member to be charged, comprising: charging means for being contacted to the member to be charged to charge the member; means for applying a voltage to said charging means, wherein said charging means includes a high resistance layer at a portion where it is contacted to the member to be charged, and the following is satisfied: ρl>E.sup.2 ×(0.1×10.sup.-3).sup.2 /P(ohm.m.sup.2) where in ρ is a volume resistivity (ohm.m) of the high resistance layer, l (m) is a thickness of the high resistance layer, E is the voltage (V) applied by said voltage applying means, P is a capacity (W) of the voltage source of said voltage applying means; wherein R2 of said charging means at a nip between said charging mean and the member to be charged and an electrostatic capacitance C2 of said charging means at this nip satisfy: ##EQU11## where E1-V 2 (n=∞) is a saturated voltage of said charging means, E1 is a voltage (V) applied to said charging means, C1 is a electrostatic capacity of the member to be charged at the nip, R1 is a resistance of the member to be charged at the nip, t 1 =(a width of the nip)/(a peripheral speed of said charging means) t 2 =(a peripheral length of said charging means)/(a peripheral speed of said charging means) wherein E2 is a charge starting voltage of the member to be charged.
Claim 55
Dependent Claim
237 words
A charging device for charging a moving member to be charged, comprising: charging means for being contacted to the member to be charged to charge the member; means for applying a voltage to said charging means, wherein said charging means includes a high resistance layer at a portion where it is contacted to the member to be charged, and the following is satisfied: ρl>E.sup.2 ×(0.1×10.sup.-3).sup.2 /P(ohm.m.sup.2) where in ρ is a volume resistivity (ohm.m) of the high resistance layer, l (m) is a thickness of the high resistance layer, E is the voltage (V) applied by said voltage applying means, P is a capacity (W) of the voltage source of said voltage applying means; wherein R2 of said charging means at a nip between said charging mean and the member to be charged and an electrostatic capacitance C2 of said charging means at this nip satisfy: ##EQU11## where E1-V 2 (n=∞) is a saturated voltage of said charging means, E1 is a voltage (V) applied to said charging means, C1 is a electrostatic capacity of the member to be charged at the nip, R1 is a resistance of the member to be charged at the nip, t 1 =(a width of the nip)/(a peripheral speed of said charging means) t 2 =(a peripheral length of said charging means)/(a peripheral speed of said charging means) wherein E2 is a charge starting voltage of the member to be charged.
Claim 56
Dependent Claim
13 words
A device according to claim 51, wherein said voltage is a vibratory voltage.
Claim 57
Dependent Claim
16 words
A device according to claim 52, wherein the voltage is a superposed DC and AC voltage.
Claim 58
Dependent Claim
18 words
A device according to claim 51, wherein said charging means is in the form of a rotatable roller.
Claim 59
Dependent Claim
19 words
A device according to claim 54, wherein said charging means rotates following movement of the member to be charged.
Claim 60
Dependent Claim
19 words
A device according to claim 51, wherein the high resistance layer of said charging means is a resin layer.
Claim 61
Dependent Claim
23 words
A device according to claim 51 or 56, wherein a rubber layer is provided behind the high resistance layer of said charging means.
Claim 62
Dependent Claim
20 words
A device according to claim 57, wherein a core member is provided behind the rubber layer of said charging means.
Claim 63
Dependent Claim
38 words
A device according to claim 51, wherein the high resistance layer of said charging means includes a resin layer at a portion of contact with the member to be charged, and a rubber layer behind the resin layer.
Claim 64
Dependent Claim
27 words
A device according to claim 59, wherein a rubber layer is provided, behind the high resistance layer, and a core member is provided behind the rubber layer.
Claim 65
Dependent Claim
17 words
A device according to claim 59, wherein a core member is provided behind the high resistance layer.
Claim 66
Dependent Claim
15 words
A device according to claim 51, wherein the high resistance layer is a rubber layer.
Claim 67
Dependent Claim
27 words
A device according to claim 62, wherein a rubber layer is provided behind the high resistance layer, and a core member is provided behind the rubber layer.
Claim 68
Dependent Claim
17 words
A device according to claim 62, wherein a core member is provided behind the high resistance layer.
Claim 69
Dependent Claim
38 words
A device according to claim 51, wherein the high resistance layer is a dielectric layer, and wherein an impedance component of an electrostatic capacity of said charging means is smaller than an impedance component of a resistance thereof.
Claim 70
Dependent Claim
26 words
A device according to claim 65, wherein the electrostatic capacity of said charging means is larger than the electrostatic capacity of the member to be charged.
Claim 71
Dependent Claim
17 words
A device according to claim 51, wherein the member to be charged is an image bearing member.
Claim 72
Dependent Claim
15 words
A device according to claim 67, wherein said image bearing member is a photosensitive member.
Claim 73
Dependent Claim
20 words
An apparatus according to claim 16, 32, 50 or 68, wherein said photosensitive member includes an amorphous silicon photosensitive layer.
Claim 74
Dependent Claim
100 words
An image forming apparatus, comprising: a moving image bearing member; charging means for being contacted to he image bearing member to charge the image bearing member; means for applying a voltage to said charging means, wherein the voltage has a peak-to-peak voltage which is not less than twice of an absolute value of a charge starting voltage relative to the member; wherein said charging means includes a first layer contactable to the member to be charged, a second layer adjacent thereto, wherein the first layer is a dielectric layer having a volume resistivity larger than that of the second layer.
Claim 75
Dependent Claim
100 words
An image forming apparatus, comprising: a moving image bearing member; charging means for being contacted to he image bearing member to charge the image bearing member; means for applying a voltage to said charging means, wherein the voltage has a peak-to-peak voltage which is not less than twice of an absolute value of a charge starting voltage relative to the member; wherein said charging means includes a first layer contactable to the member to be charged, a second layer adjacent thereto, wherein the first layer is a dielectric layer having a volume resistivity larger than that of the second layer.
Claim 76
Dependent Claim
26 words
An apparatus according to claim 70, further comprising a process unit detachably mountable to said apparatus and containing said image bearing member and said charging means.
Claim 77
Dependent Claim
76 words
An image forming apparatus, comprising: a movable image bearing member; charging means for being contacted to said image bearing member to charge the image bearing member; means for applying a vibratory voltage to the charging means; wherein said charging means includes a surface dielectric layer at a contact portion with the image bearing member, and the impedance component of the electrostatic capacity of said charging means is smaller than the impedance component of the resistance thereof.
Claim 78
Dependent Claim
76 words
An image forming apparatus, comprising: a movable image bearing member; charging means for being contacted to said image bearing member to charge the image bearing member; means for applying a vibratory voltage to the charging means; wherein said charging means includes a surface dielectric layer at a contact portion with the image bearing member, and the impedance component of the electrostatic capacity of said charging means is smaller than the impedance component of the resistance thereof.
Claim 79
Dependent Claim
26 words
An apparatus according to claim 72, further comprising a process unit detachably mountable to said apparatus and containing said image bearing member and said charging means.
Claim 80
Dependent Claim
111 words
An image forming apparatus, comprising: a movable image bearing member; charging means for being contacted to said image bearing member to charge the image bearing member; means for applying a voltage to said charging means; wherein said charging means includes high resistance layer at a portion where it is contacted to the image bearing member, and the following is satisfied: ρl>E.sup.2 ×(0.1×10.sup.-3).sup.2 /P(ohm.m.sup.2) where in ρ is a volume resistivity (ohm.m) of the high resistance layer, l (m) is a thickness of the high resistance layer, E is the voltage (V) applied by said voltage applying means, P is a capacity (W) of the voltage source of said voltage applying means.
Claim 81
Dependent Claim
111 words
An image forming apparatus, comprising: a movable image bearing member; charging means for being contacted to said image bearing member to charge the image bearing member; means for applying a voltage to said charging means; wherein said charging means includes high resistance layer at a portion where it is contacted to the image bearing member, and the following is satisfied: ρl>E.sup.2 ×(0.1×10.sup.-3).sup.2 /P(ohm.m.sup.2) where in ρ is a volume resistivity (ohm.m) of the high resistance layer, l (m) is a thickness of the high resistance layer, E is the voltage (V) applied by said voltage applying means, P is a capacity (W) of the voltage source of said voltage applying means.
Claim 82
Dependent Claim
26 words
An apparatus according to claim 74, further comprising a process unit detachably mountable to said apparatus and containing said image bearing member and said charging means.
Claim 83
Dependent Claim
96 words
A process unit detachably mountable to an image forming apparatus, comprising: an image bearing member; charging means for being contacted to the image bearing member to charge the image bearing member, wherein a charging voltage has a peak-to-peak voltage which is not less than twice of an absolute value of a charge starting voltage relative to the member; wherein said charging means includes a first layer contactable to the image bearing member, a second layer adjacent thereto wherein the first layer is a dielectric layer having a volume resistivity larger than that of the second layer.
Claim 84
Dependent Claim
96 words
A process unit detachably mountable to an image forming apparatus, comprising: an image bearing member; charging means for being contacted to the image bearing member to charge the image bearing member, wherein a charging voltage has a peak-to-peak voltage which is not less than twice of an absolute value of a charge starting voltage relative to the member; wherein said charging means includes a first layer contactable to the image bearing member, a second layer adjacent thereto wherein the first layer is a dielectric layer having a volume resistivity larger than that of the second layer.
Claim 85
Dependent Claim
80 words
A process unit detachably mountable to an image forming apparatus, comprising: an image bearing member; charging means for being contacted to the image bearing member to charge the image bearing member, said charging means being supplied with a vibratory voltage; wherein said charging means includes a surface dielectric layer at a contact portion with the image bearing member, and the impedance components of the electrostatic capacity of said charging means is smaller than the impedance component of the resistance thereof.
Claim 86
Dependent Claim
80 words
A process unit detachably mountable to an image forming apparatus, comprising: an image bearing member; charging means for being contacted to the image bearing member to charge the image bearing member, said charging means being supplied with a vibratory voltage; wherein said charging means includes a surface dielectric layer at a contact portion with the image bearing member, and the impedance components of the electrostatic capacity of said charging means is smaller than the impedance component of the resistance thereof.
Claim 87
Dependent Claim
116 words
A process unit detachably mountable to an image forming apparatus, comprising: an image bearing member; charging means for being contacted to the image bearing member to charge the image bearing member, said charging means being supplied with a voltage; wherein said charging means include a high resistance layer at a portion wherein it is contacted to the image bearing member, and the following is satisfied: ρl>E.sup.2 ×(0.1×10.sup.-3).sup.2 /P(ohm.m.sup.2) where in ρ is a volume resistivity (ohm.m) of the high resistance layer, l (m) is a thickness of the high resistance layer, E is the voltage (V) applied by said charging means, P is a capacity (W) of a voltage source of said voltage applying the voltage.
Claim 88
Dependent Claim
116 words
A process unit detachably mountable to an image forming apparatus, comprising: an image bearing member; charging means for being contacted to the image bearing member to charge the image bearing member, said charging means being supplied with a voltage; wherein said charging means include a high resistance layer at a portion wherein it is contacted to the image bearing member, and the following is satisfied: ρl>E.sup.2 ×(0.1×10.sup.-3).sup.2 /P(ohm.m.sup.2) where in ρ is a volume resistivity (ohm.m) of the high resistance layer, l (m) is a thickness of the high resistance layer, E is the voltage (V) applied by said charging means, P is a capacity (W) of a voltage source of said voltage applying the voltage.
References Cited (Backward Citations)
US2980834A
Cited
US2934649A
Cited
US3626260A
Cited
US3778690A
Cited
DE3101678A1
Cited
US4380384A
Cited
EP0035745A2
Cited
JPS5772157A
Cited
EP0272072A2
Cited
US4851960A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-30 | 1995-12-30 | 1996-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-30 | 1999-12-30 | 2000-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-30 | 2003-12-30 | 2004-06-30 | $7700.00 | Window Closed / Lapsed |