US5235386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Charging device having charging member, process cartridge and image forming apparatus
Assignee: Canon Inc
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Filing: 1992-02-21
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Granted: 1993-08-10
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Expires: 2012-02-21
Abstract
Abstract A charging device including a movable member to be charged, and a charging member which is contactable to the member to be charged so as to charge the member to be charged, wherein the coefficient of dynamic friction between the member to be charged and a surface of the charging member contactable to the member to be charged is not lower than 0.4.
Inventors
- 👤 Hideyuki Yano
- 👤 Koichi Tanigawa
- 👤 Akihiko Takeuchi
- 👤 Hiroshi Sasame
- 👤 Yasumasa Ohtsuka
- 👤 Takayasu Yuminamochi
- 👤 Hiroto Hasegawa
- 👤 Hideo Nanataki
- 👤 Kazuaki Ono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:18
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0208; G03G15/0216; G03G15/0233
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
63 words
A charging device, comprising: a movable member to be charged, and a charging member which is contactable to the member to be charged so as to charge the member to be charged, wherein the coefficient of dynamic friction between the member to be charged and a surface of the charging member contactable to the member to be charged is not lower than 0.4.
Claim 2
Dependent Claim
63 words
A charging device, comprising: a movable member to be charged, and a charging member which is contactable to the member to be charged so as to charge the member to be charged, wherein the coefficient of dynamic friction between the member to be charged and a surface of the charging member contactable to the member to be charged is not lower than 0.4.
Claim 3
Dependent Claim
66 words
A process cartridge detachably mountable to an image forming apparatus, the process cartridge comprising: a movable image bearing member, and a charging member which is contactable to the image bearing member to charge the image bearing member, wherein the coefficient of dynamic friction between the image bearing member and a surface of the charging member contactable to the image bearing member is not lower than 0.4.
Claim 4
Dependent Claim
66 words
A process cartridge detachably mountable to an image forming apparatus, the process cartridge comprising: a movable image bearing member, and a charging member which is contactable to the image bearing member to charge the image bearing member, wherein the coefficient of dynamic friction between the image bearing member and a surface of the charging member contactable to the image bearing member is not lower than 0.4.
Claim 5
Dependent Claim
69 words
An image forming apparatus, comprising: a movable image bearing member, image forming means for forming an image on the image bearing member, and a charging member which is contactable to the image bearing member to charge the image bearing member; wherein the coefficient of dynamic friction between the image bearing member and a surface of the charging member contactable to the image bearing member is not lower than 0.4.
Claim 6
Dependent Claim
69 words
An image forming apparatus, comprising: a movable image bearing member, image forming means for forming an image on the image bearing member, and a charging member which is contactable to the image bearing member to charge the image bearing member; wherein the coefficient of dynamic friction between the image bearing member and a surface of the charging member contactable to the image bearing member is not lower than 0.4.
Claim 7
Dependent Claim
27 words
An image forming apparatus according to claim 3, which further comprises voltage application means for applying a voltage between the image bearing member and the charging member.
Claim 8
Dependent Claim
14 words
An image forming apparatus according to claim 4, wherein the voltage is periodically changed.
Claim 9
Dependent Claim
22 words
An image forming apparatus according to claim 5, wherein the voltage comprises a superposition comprising an AC voltage and a DC voltage.
Claim 10
Dependent Claim
28 words
An image forming apparatus according to claim 3, wherein the surface of the charging member contactable to the image bearing member comprises a surface of a resin layer.
Claim 11
Dependent Claim
18 words
An image forming apparatus according to claim 7, wherein the resin layer contains an electroconductive substance dispersed therein.
Claim 12
Dependent Claim
25 words
An image forming apparatus according to claim 7, wherein the resin layer comprises a nylon resin, and TiO 2 is dispersed in the nylon resin.
Claim 13
Dependent Claim
19 words
An apparatus according to claim 7, 8 or 9, wherein said charging member is crowned in its longitudinal direction.
Claim 14
Dependent Claim
16 words
An image forming apparatus according to claim 3, wherein the charging member has a roller shape.
Claim 15
Dependent Claim
23 words
An image forming apparatus according to claim 3, wherein the image forming means and the charging member are provided in a common unit.
Claim 16
Dependent Claim
17 words
An image forming apparatus according to claim 3, wherein the image bearing member comprises a photosensitive member.
Claim 17
Dependent Claim
19 words
An image forming apparatus according to claim 13, wherein the photosensitive member comprises a layer of an organic photoconductor.
Claim 18
Dependent Claim
20 words
An image forming apparatus according to claim 3, wherein the coefficient of the dynamic friction is not higher than 2.0.
Claim 19
Dependent Claim
37 words
An image forming apparatus according to claim 3, wherein the image forming means comprises developing means for developing an image formed on the image bearing member with a developer, and the developer comprises a polymethyl methacrylate resin.
Claim 20
Dependent Claim
30 words
An image forming apparatus according to claim 3 or 5, wherein the surface of the charging member contactable to the image bearing member is coated with a polymethyl methacrylate resin.
Claim 21
Dependent Claim
16 words
An apparatus according to claim 17, wherein said charging member is crowned in its longitudinal direction.
Claim 22
Dependent Claim
16 words
An apparatus according to claim 3, wherein the dynamic friction coefficient is not less than 0.6.
Claim 23
Dependent Claim
25 words
An apparatus according to claim 3, wherein a total pressure between said charging member and the image bearing member is not less than 400 g.
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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) | 1996-08-09 | 1997-02-08 | 1997-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-09 | 2001-02-08 | 2001-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-09 | 2005-02-08 | 2005-08-10 | $7700.00 | Window Closed / Lapsed |