US5579095A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Charging device
Assignee: Canon Inc
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Filing: 1995-06-20
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Granted: 1996-11-26
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Expires: 2015-06-20
Abstract
Abstract A charging device for charging a member to be charged, includes a charging material for charging the member to be charged, the charging material including a layer of particles capable of being supplied with a voltage and contactable to the member to be charged, wherein the particle layer comprises first particles having a volume resistivity of not less than 6.0×10 3 Ohm.cm and less than 1.0×10 5 Ohm.cm and second particles having a volume resistivity of not less than 6.3×10 5 Ohm.cm mixed with the first particles.
Inventors
- 👤 Hideyuki Yano
- 👤 Harumi Ishiyama
- 👤 Tadashi Furuya
- 👤 Seiji Mashimo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:59
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0208; G03G15/0241; G03G5/00; G03G2215/00; G03G2215/02; G03G2215/021; G03G2215/022; G03G2221/00; G03G2221/16; G03G2221/18; G03G2221/183
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
85 words
A charging device for charging a member to be charged, comprising: charging material for charging the member to be charged, said charging material including a layer of particles capable of being supplied with a voltage and contactable to the member to be charged, said particle layer comprising first particles having a volume resistivity of not less than 6.0×10 3 Ohm.cm and less than 1.0×10 5 Ohm.cm and second particles having a volume resistivity of not less than 6.3×10 5 Ohm.cm mixed with said first particles.
Claim 2
Dependent Claim
85 words
A charging device for charging a member to be charged, comprising: charging material for charging the member to be charged, said charging material including a layer of particles capable of being supplied with a voltage and contactable to the member to be charged, said particle layer comprising first particles having a volume resistivity of not less than 6.0×10 3 Ohm.cm and less than 1.0×10 5 Ohm.cm and second particles having a volume resistivity of not less than 6.3×10 5 Ohm.cm mixed with said first particles.
Claim 3
Dependent Claim
30 words
A device according to claim 1, wherein a content of said first particles is not more than 40% by weight on the basis of the weight of the particle layer.
Claim 4
Dependent Claim
28 words
A device according to claim 1 or 2, wherein an average particle size of said first particles is smaller than an average particle size of the second particles.
Claim 5
Dependent Claim
20 words
A device according to claim 3, wherein the first particles have an average particle size of less than 30 microns.
Claim 6
Dependent Claim
22 words
A device according to claim 1 or 2, wherein said second particles have a volume resistivity of less than 1.0×10 10 Ohm.cm.
Claim 7
Dependent Claim
34 words
A device according to claim 1 or 2, wherein said charging material is movable, and a peripheral speed of said charging member is different from a peripheral speed of the member to be charged.
Claim 8
Dependent Claim
24 words
A device according to claim 1 or 2, wherein the first particles are made of magnetite, and the second particles are made of ferrite.
Claim 9
Dependent Claim
29 words
A device according to claim 1 or 2, wherein the member to be charged comprises a charge injection layer having a volume resistivity of 1.0×10 8 -1.0×10 15 Ohm.cm.
Claim 10
Dependent Claim
26 words
A device according to claim 1 or 2, wherein a content of the first particles is not less than 5% by weight of the particle layer.
Claim 11
Dependent Claim
34 words
A device according to claim 1, wherein a volume resistivity×Ohm.cm. of the first particles and a weight ratio y of the first particles relative to that of the particle layer, satisfy: y≦15+2.5 log.sub.10 x.
Claim 12
Dependent Claim
39 words
A device according to claim 8, wherein the member to be charged comprises a photosensitive layer inside the charge injection layer, and said charge injection layer transmits light and comprises an insulative binder and electroconductive fine particles dispersed therein.
Claim 13
Dependent Claim
16 words
A device according to claim 11, wherein the charge injection layer comprises lubricant particles dispersed therein.
Claim 14
Dependent Claim
21 words
A device according to claim 12, wherein the lubricant particles are made of fluorine resin, polyolefine resin or silicone resin material.
Claim 15
Independent Claim
24 words
A device according to any one of claims 1, 2, 10 and 12, wherein said first particles and said second particles are magnetic particles.
Claim 16
Dependent Claim
17 words
A device according to claim 1, wherein the member to be charged is an electrophotographic photosensitive member.
Claim 17
Dependent Claim
33 words
A device according to claim 15, wherein the member to be charged and said charging device are disposed in a process cartridge detachably mountable to a main assembly of an image forming apparatus.
Claim 18
Dependent Claim
17 words
A device according to claim 3, wherein said first particles and said second particles are magnetic particles.
Claim 19
Dependent Claim
17 words
A device according to claim 4, wherein said first particles and said second particles are magnetic particles.
Claim 20
Dependent Claim
17 words
A device according to claim 5, wherein said first particles and said second particles are magnetic particles.
Claim 21
Dependent Claim
17 words
A device according to claim 7, wherein said first particles and said second particles are magnetic particles.
Claim 22
Dependent Claim
17 words
A device according to claim 8, wherein said first particles and said second particles are magnetic particles.
Claim 23
Dependent Claim
17 words
A device according to claim 9, wherein said first particles and said second particles are magnetic particles.
Claim 24
Dependent Claim
17 words
A device according to claim 11, wherein said first particles and said second particles are magnetic particles.
Claim 25
Dependent Claim
33 words
A device according to claim 17, wherein the member to be charged and said charging device are disposed in a process cartridge detachably mountable to a main assembly of an image forming apparatus.
Claim 26
Dependent Claim
33 words
A device according to claim 18, wherein the member to be charged and said charging device are disposed in a process cartridge detachably mountable to a main assembly of an image forming apparatus.
Claim 27
Dependent Claim
33 words
A device according to claim 19, wherein the member to be charged and said charging device are disposed in a process cartridge detachably mountable to a main assembly of an image forming apparatus.
Claim 28
Dependent Claim
33 words
A device according to claim 20, wherein the member to be charged and said charging device are disposed in a process cartridge detachably mountable to a main assembly of an image forming apparatus.
Claim 29
Dependent Claim
33 words
A device according to claim 21, wherein the member to be charged and said charging device are disposed in a process cartridge detachably mountable to a main assembly of an image forming apparatus.
Claim 30
Dependent Claim
33 words
A device according to claim 22, wherein the member to be charged and said charging device are disposed in a process cartridge detachably mountable to a main assembly of an image forming apparatus.
Claim 31
Dependent Claim
33 words
A device according to claim 23, wherein the member to be charged and said charging device are disposed in a process cartridge detachably mountable to a main assembly of an image forming apparatus.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-11-26 | 2000-05-27 | 2000-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-11-26 | 2004-05-27 | 2004-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-11-26 | 2008-05-27 | 2008-11-26 | $7700.00 | Window Closed / Lapsed |