Patent US774048A successfully refreshed from Google Patents.
Patent US5331385A successfully refreshed from Google Patents.
US5331385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fixing rotatable member having conductive parting layer and fixing apparatus using same
Assignee: Canon Inc
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Filing: 1991-05-15
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Granted: 1994-07-19
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Expires: 2011-05-15
Abstract
Abstract An image fixing rotatable member and an image fixing apparatus using the rotatable member as a pressing rotatable member, having a fluorine resin tube over a rubber layer, wherein the volume resistivity of the rubber layer is lower than that of the fluorine resin tube so as to avoid charge build-up on the fluorine resin tube.
Inventors
- 👤 Yasumasa Ohtsuka
- 👤 Akihiko Takeuchi
- 👤 Koichi Tanigawa
- 👤 Hideo Nanataki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:53
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/206; G03G15/2017; G03G15/2025
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
140 words
An image forming apparatus comprising: an image bearing member for carrying an unfixed image; image transfer means for electrostatically transferring the unfixed image from said image bearing member onto a recording material; a fixing rotatable member contactable with that surface of the recording material which carries the unfixed image; and a pressing rotatable member cooperative with said fixing rotatable member to form a nip therebetween, said pressing rotatable member being contactable to that surface of said recording material which has received electric charge from said image transfer means, wherein said pressing rotatable member comprises a conductive core member, a rubber layer on said core member and a surface fluorine resin layer having a lower volume resistivity than said rubber layer, wherein resistance between the core member of said pressing rotatable member and the nip is 10 8 -10 12 ohm.cm.
Claim 2
Dependent Claim
140 words
An image forming apparatus comprising: an image bearing member for carrying an unfixed image; image transfer means for electrostatically transferring the unfixed image from said image bearing member onto a recording material; a fixing rotatable member contactable with that surface of the recording material which carries the unfixed image; and a pressing rotatable member cooperative with said fixing rotatable member to form a nip therebetween, said pressing rotatable member being contactable to that surface of said recording material which has received electric charge from said image transfer means, wherein said pressing rotatable member comprises a conductive core member, a rubber layer on said core member and a surface fluorine resin layer having a lower volume resistivity than said rubber layer, wherein resistance between the core member of said pressing rotatable member and the nip is 10 8 -10 12 ohm.cm.
Claim 3
Dependent Claim
19 words
An apparatus according to claim 1, wherein said rubber layer and said surface resin layer contain low resistance material.
Claim 4
Dependent Claim
19 words
An apparatus according to claim 1, wherein said surface fluorine resin layer is in the form of a tube.
Claim 5
Dependent Claim
15 words
An apparatus according to claim 3, wherein the tube has a thickness of 30-50 microns.
Claim 6
Dependent Claim
21 words
An apparatus according to claim 3, wherein said tube has a thickness which is smaller than that of said rubber layer.
Claim 7
Dependent Claim
19 words
An apparatus according to claim 3, wherein said tube is bonded to said rubber layer with a conductive adhesive.
Claim 8
Dependent Claim
12 words
An apparatus according to claim 1, wherein said core member is grounded.
Claim 9
Dependent Claim
16 words
An apparatus according to claim 1, wherein said fixing rotatable member has an insulative surface layer.
References Cited (Backward Citations)
US3809854A
Cited
US3988817A
Cited
US4179601A
Cited
US4347277A
Cited
US4257699A
Cited
US4272179A
Cited
US4320714A
Cited
US4329565A
Cited
JPS5990874A
Cited
US4719489A
Cited
US4796046A
Cited
JPS6194074A
Cited
US4842944A
Cited
US4829931A
Cited
US4819020A
Cited
US5011401A
Cited
US5045891A
Cited
JPS6424284A
Cited
US4763158A
Cited
US4887340A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-07-18 | 1998-01-17 | 1998-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-18 | 2002-01-17 | 2002-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-18 | 2006-01-17 | 2006-07-19 | $7700.00 | Window Closed / Lapsed |