US6005594A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fixing apparatus having a fixing roller with a non-adhesive surface layer
Assignee: Canon Inc
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Filing: 1995-01-23
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Granted: 1999-12-21
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Expires: 2015-01-23
Abstract
Abstract A fixing apparatus prevents the offset of toner onto a fixing roller, by forming a surface mold release layer made of pure fluororesin material on a core member of the fixing roller and by applying a bias voltage to the fixing roller.
Inventors
- 👤 Hideo Nanataki
- 👤 Koichi Tanigawa
- 👤 Yasumasa Ohtsuka
- 👤 Takayasu Yuminamochi
- 👤 Akihiko Takeuchi
- 👤 Hiroto Hasegawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:56
CPC Classifications
B; B82; B82Y; B82Y15/00; G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2064; G03G15/2053; G03G15/2057
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
172 words
A fixing device, comprising: a fixing rotary member having an electrically conductive core member and an electrically insulative non-adhesive surface layer provided thereon; voltage applying means for applying a bias voltage having the same polarity as an unfixed toner image to said conductive core member; and a back-up member forming a nip with said fixing rotary member, wherein a recording material bearing an unfixed toner image is passed through the nip to fix the unfixed toner image on the recording material, and wherein said back-up member includes a low resistance elastic layer at a surface thereof or in the vicinity of the surface, wherein both ends of said non-adhesive surface layer extend outwardly over both ends of said low resistance elastic layer, and wherein, when the voltage applied to said rotary member is V(V), a difference AB (mm) in distance between the end of said non-adhesive surface layer and the corresponding end of said back-up member is indicated as the following equation: AB=V/300+α(mm) wherein α is a tolerance value and α≦1 mm.
Claim 2
Dependent Claim
172 words
A fixing device, comprising: a fixing rotary member having an electrically conductive core member and an electrically insulative non-adhesive surface layer provided thereon; voltage applying means for applying a bias voltage having the same polarity as an unfixed toner image to said conductive core member; and a back-up member forming a nip with said fixing rotary member, wherein a recording material bearing an unfixed toner image is passed through the nip to fix the unfixed toner image on the recording material, and wherein said back-up member includes a low resistance elastic layer at a surface thereof or in the vicinity of the surface, wherein both ends of said non-adhesive surface layer extend outwardly over both ends of said low resistance elastic layer, and wherein, when the voltage applied to said rotary member is V(V), a difference AB (mm) in distance between the end of said non-adhesive surface layer and the corresponding end of said back-up member is indicated as the following equation: AB=V/300+α(mm) wherein α is a tolerance value and α≦1 mm.
Claim 3
Dependent Claim
25 words
A fixing device according to claim 1, wherein a volume resistivity value of said non-adhesive surface layer is not less than 10 14 Ω cm.
Claim 4
Dependent Claim
17 words
A fixing device according to claim 1, wherein said non-adhesive surface layer is made of pure fluororesin.
Claim 5
Dependent Claim
26 words
A fixing device according to claim 1, wherein a volume resistivity value of said low resistant elastic layer is 10 2 to 10 5 Ω cm.
Claim 6
Dependent Claim
16 words
A fixing device according to claim 1, wherein said elastic layer is a surface rubber layer.
Claim 7
Dependent Claim
32 words
A fixing device according to claim 1, wherein said elastic layer of low electrical resistance is a rubber layer, and an electrically insulative surface resin layer is provided on said rubber layer.
Claim 8
Dependent Claim
14 words
A fixing device according to claim 1, wherein said distance AB is V/300 (mm).
Claim 9
Dependent Claim
23 words
A fixing device according to claim 1, further comprising electrical charge removing means for removing an electrical charge on said non-adhesive surface layer.
Claim 10
Dependent Claim
32 words
A fixing device according to claim 1, wherein the unfixed toner image contacts with said fixing rotary member, and the unfixed toner image receives electrostatic attractive force directed to said back-up member.
Claim 11
Dependent Claim
23 words
A fixing device according to claim 1, wherein said back-up member has an actual resistance of 10 3 Ω to 10 11 Ω.
Claim 12
Dependent Claim
53 words
A fixing device according to claim 1, wherein said low resistance elastic layer is grounded via a rectifier element, said rectifier element being connected in a direction that electric charges having the polarity opposite to that of the unfixed toner can be shifted from the grounded side to said low resistance elastic layer.
Claim 13
Dependent Claim
27 words
A fixing device according to claim 1, wherein said back-up member includes an electrically conductive surface resin layer which is provided on said low resistant elastic layer.
Claim 14
Dependent Claim
114 words
A fixing device, comprising: a fixing rotary member having an electrically conductive core member and an electrically insulative non-adhesive surface layer provided thereon; voltage applying means for applying a bias voltage to said conductive core member ;and a back-up member forming a nip with said fixing rotary member, wherein a recording material bearing an unfixed toner image is pinched and conveyed through said nip to fix the unfixed toner image on the recording material, and said back-up member includes a low resistant elastic layer at a surface thereof or in the vicinity of the surface, wherein a volume resistivity value of said low resistant elastic layer is 10 2 Ω to 10 5 Ω·cm.
Claim 15
Dependent Claim
114 words
A fixing device, comprising: a fixing rotary member having an electrically conductive core member and an electrically insulative non-adhesive surface layer provided thereon; voltage applying means for applying a bias voltage to said conductive core member ;and a back-up member forming a nip with said fixing rotary member, wherein a recording material bearing an unfixed toner image is pinched and conveyed through said nip to fix the unfixed toner image on the recording material, and said back-up member includes a low resistant elastic layer at a surface thereof or in the vicinity of the surface, wherein a volume resistivity value of said low resistant elastic layer is 10 2 Ω to 10 5 Ω·cm.
Claim 16
Dependent Claim
25 words
A fixing device according to claim 13, wherein the volume resistivity value of said non-adhesive surface layer is not less than 10 14 Ω cm.
Claim 17
Dependent Claim
17 words
A fixing device according to claim 13, wherein said non-adhesive surface layer is made of pure fluororesin.
Claim 18
Dependent Claim
20 words
A fixing device according to claim 13, wherein said bias voltage has the same polarity as the unfixed toner image.
Claim 19
Dependent Claim
18 words
A fixing device according to claim 16, wherein the unfixed toner image contacts with said fixing rotary member.
Claim 20
Dependent Claim
18 words
A fixing device according to claim 13, wherein said low resistant elastic layer is a surface rubber layer.
Claim 21
Dependent Claim
30 words
A fixing device according to claim 13, wherein said low resistant elastic layer is a rubber layer, and an electrically insulative surface resin layer is provided on said rubber layer.
Claim 22
Dependent Claim
26 words
A fixing device according to claim 13, wherein both ends of said non-adhesive surface layer extend outwardly over both ends of said low resistant elastic layer.
Claim 23
Dependent Claim
60 words
A fixing device according to claim 20, wherein when the voltage applied to said rotary member is V (V), a difference AB (mm) is a distance between an end of said non-adhesive surface layer and a corresponding end of said back-up member is indicated as the following equation: AB (mm)=V/300+α (mm), where α is a tolerance value and α≦1 mm.
Claim 24
Dependent Claim
14 words
A fixing device according to claim 21, wherein said distance AB is V/300 (mm).
Claim 25
Dependent Claim
23 words
A fixing device according to claim 13, further comprising electrical charge removing means for removing an electrical charge on said non-adhesive surface layer.
Claim 26
Dependent Claim
23 words
A fixing device according to claim 13, wherein said back-up member has an actual resistance of 10 3 Ω to 10 11 Ω.
Claim 27
Dependent Claim
15 words
A fixing device according to claim 13, wherein said low resistance elastic layer is grounded.
Claim 28
Dependent Claim
52 words
A fixing according to claim 13, wherein said low resistance elastic layer is grounded via a rectifier element, said rectifier element being connected in a direction that electric charges having the polarity opposite to that of the unfixed toner can be shifted from the grounded side to said low resistance elastic layer.
Claim 29
Dependent Claim
58 words
A fixing device according to claim 13, wherein said fixing device is disposed downstream of a transfer portion to transfer a toner image onto the recording material by a charge in a convey direction of the recording member, and a length of the recording material is longer than a distance between the transfer portion and the fixing nip.
Claim 30
Dependent Claim
20 words
A fixing device according to claim 13, wherein a surface releasing layer is provided on said low resistance elastic layer.
Claim 31
Dependent Claim
20 words
A fixing device according to claim 28, wherein said surface releasing layer has a thickness of 60 μm or less.
Claim 32
Dependent Claim
26 words
A fixing device according to claim 13, wherein said back-up member includes an electrically conductive surface resin layer which is provided on said low resistant layer.
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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) | 2002-12-20 | 2003-06-21 | 2003-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-12-20 | 2007-06-21 | 2007-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-12-20 | 2011-06-21 | 2011-12-21 | $7700.00 | Window Closed / Lapsed |