US6002106A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fixing device
Assignee: Canon Inc
•
Filing: 1997-12-19
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Granted: 1999-12-14
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Expires: 2017-12-19
Abstract
Abstract In a fixing device, a recording material having an unfixed toner image formed thereon is inserted between a pair of rotating members, and the toner image is fixed on the recording material by heating/pressing the recording material having the unfixed toner image formed thereon. By providing the fixing device with a releasing layer, made of a PFA resin having end groups of --CF 3 , formed on a surface of a fixing rotating member, which serves as one of the pair of rotating members, contacting the unfixed toner image, and a releasing layer, having a volume resistivity of 10 13 -10 15 Ω·cm (when applying a DC voltage of 500 V) and made of a PFA resin containing a conductivity providing material, formed on a surface of a pressing rotating member, which serves the other one of the pair of rotating members, a problem of offset is solved.
Inventors
- 👤 Hiroshi Kataoka
- 👤 Masaharu Ohkubo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:41
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2053; G03G15/2057
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
140 words
A fixing device in which a recording material having an unfixed toner image formed thereon is inserted between a pair of rotating members, and the toner image is fixed on the recording material by heating/pressing the recording material having the unfixed toner image formed thereon, said device comprising: a releasing layer, made of a PFA resin having end groups of --CF 3 , formed on a surface of a fixing rotating member, which serves as one of the pair of rotating members, contacting the unfixed toner image; and a releasing layer, having a volume resistivity of 10 13 -10 15 Ω·cm (when applying a DC voltage of 500 V) and made of a PFA resin containing a conductivity providing material, formed on a surface of a pressing rotating member, which serves the other one of the pair of rotating members.
Claim 2
Dependent Claim
140 words
A fixing device in which a recording material having an unfixed toner image formed thereon is inserted between a pair of rotating members, and the toner image is fixed on the recording material by heating/pressing the recording material having the unfixed toner image formed thereon, said device comprising: a releasing layer, made of a PFA resin having end groups of --CF 3 , formed on a surface of a fixing rotating member, which serves as one of the pair of rotating members, contacting the unfixed toner image; and a releasing layer, having a volume resistivity of 10 13 -10 15 Ω·cm (when applying a DC voltage of 500 V) and made of a PFA resin containing a conductivity providing material, formed on a surface of a pressing rotating member, which serves the other one of the pair of rotating members.
Claim 3
Dependent Claim
34 words
A fixing device according to claim 1, wherein said releasing layer of the fixing rotating member has a volume resistivity of 10 14 -10 16 Ω·cm (when applying a DC voltage of 500 V).
Claim 4
Dependent Claim
20 words
A fixing device according to claim 1, wherein said releasing layer of the fixing rotating member comprises a PFA-resin tube.
Claim 5
Dependent Claim
21 words
A fixing device according to claim 1, further comprising an elastic layer under said releasing layer of the pressing rotating member.
Claim 6
Dependent Claim
54 words
A fixing device according to claim 4, wherein said elastic layer has a volume resistivity of 10 3 -10 6 Ω·cm (when applying a DC voltage of 100 V), and wherein the entire pressing rotating member has a volume resistivity of 10 10 -10 13 Ω·cm (when applying a DC voltage of 500 V).
Claim 7
Dependent Claim
21 words
A fixing device according to claim 4, wherein said releasing layer of the pressing rotating member comprises a PFA resin tube.
Claim 8
Dependent Claim
15 words
A fixing device according to claim 4, wherein said elastic layer comprises a solid rubber.
Claim 9
Dependent Claim
16 words
A fixing device according to claim 1, wherein the conductivity providing material comprises carbon fine particles.
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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) | 2002-12-13 | 2003-06-14 | 2003-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-12-13 | 2007-06-14 | 2007-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-12-13 | 2011-06-14 | 2011-12-14 | $7700.00 | Window Closed / Lapsed |