US4776070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directly-heating roller for fixing toner images
Assignee: Proterial Ltd
•
Filing: 1987-03-10
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Granted: 1988-10-11
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Expires: 2007-03-10
Abstract
Abstract The roller has a roller body having a small electrical resistivity, a bonding layer formed substantially uniformly on the outer peripheral surface of the roller body, a lower insulating layer provided on the bonding layer; a heat generating layer provided on the lower insulating layer and a ceramic matrix and a metallic resistance layer, constituted by a metal dispersed in the ceramic matrix, the metallic resistance layer extending substantially continuously in the lengthwise direction of the roller, a heat generating layer, an upper insulating layer provided on the heat generating layer, a protective layer formed on the upper insulating layer so as to prevent offset of the toner images, an electrode layer formed on each end of the roller and adapted to connect the heat generating layer to an external power source; and side protective layers covering at least the side surface of the heat generating layer, and the side surfaces and the axially outside surfaces of the lower insulating layer.
Inventors
- 👤 Ryoichi Shibata
- 👤 Tsutomu Iimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:29
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2053; G03G15/2057
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
165 words
A directly-heating roller for fixing toner images comprising: (a) a roller body having a small resistivity; (b) a bonding layer formed substantially uniformly on the outer peripheral surface of said roller body; (c) a lower insulating layer provided on said bonding layer; (d) a heat generating resistance layer provided on said lower insulating layer and having a ceramic matrix and a metallic resistance layer constituted by a metal dispersed in said ceramic matrix, said metallic resistance layer extending substantially continuously in the lengthwise direction of said roller; (e) an upper insulating layer provided on said heat generating layer; (f) an offset preventing layer formed on said upper insulating layer so as to prevent offset of said toner images; (g) an electrode layer formed on each end of said roller and adapted to connect said heat generating layer to an external power source; and (h) side protective layers formed at least on the side surfaces of the lower insulating layer and on the heat generating layer.
Claim 2
Dependent Claim
165 words
A directly-heating roller for fixing toner images comprising: (a) a roller body having a small resistivity; (b) a bonding layer formed substantially uniformly on the outer peripheral surface of said roller body; (c) a lower insulating layer provided on said bonding layer; (d) a heat generating resistance layer provided on said lower insulating layer and having a ceramic matrix and a metallic resistance layer constituted by a metal dispersed in said ceramic matrix, said metallic resistance layer extending substantially continuously in the lengthwise direction of said roller; (e) an upper insulating layer provided on said heat generating layer; (f) an offset preventing layer formed on said upper insulating layer so as to prevent offset of said toner images; (g) an electrode layer formed on each end of said roller and adapted to connect said heat generating layer to an external power source; and (h) side protective layers formed at least on the side surfaces of the lower insulating layer and on the heat generating layer.
Claim 3
Dependent Claim
33 words
A directly-heating roller according to claim 1, wherein said metallic resistance layer is made of a material essentially consisting of 10 to 35 wt% of an Ni-Cr alloy and the balance substantially ceramic.
Claim 4
Dependent Claim
25 words
A directly-heating roller according to claim 2, wherein said Ni-Cr alloy essentially consists of 5 tp 20 wt% of Cr and the balance substantially Ni.
Claim 5
Dependent Claim
16 words
A directly-heating roller according to claim 3, wherein said ceramic is Al 2 O 3 .
Claim 6
Dependent Claim
25 words
A directly-heating roller according to claim 1, wherein said heat insulating layer has a thermal expansion coefficient which is not smaller than 6×10 -6 /deg.
Claim 7
Dependent Claim
21 words
A directly-heating roller according to claim 5, wherein said lower insulating layer has a thickness ranging between 200 and 500 μm.
Claim 8
Dependent Claim
30 words
A directly-heating roller according to claim 6, wherein said lower insulating layer has a thickness of 300 μm, while said upper insulating layer has a thickness of about 100 μm.
Claim 9
Dependent Claim
44 words
A directly-heating roller according to claim 5, wherein said heat insulating layer is made of an oxide selected from a group consisting of Al 2 O 3 , MgO, ZrO 2 , MgAl 2 O 4 , ZrO 2 .SiO 2 , and Mno.Nio.
Claim 10
Dependent Claim
16 words
A directly-heating roller according to claim 8, wherein said oxide is MgAl 2 O 4 .
Claim 11
Dependent Claim
16 words
A directly-heating roller according to claim 8, wherein said oxide is Al 2 O 3 .
Claim 12
Dependent Claim
21 words
A directly-heating roller according to claim 10, wherein the wall thickness of said roller body is not greater than 2 mm.
Claim 13
Dependent Claim
18 words
A directly-heating roller according to claim 1, wherein the roller body is made of iron or iron alloy.
Claim 14
Dependent Claim
21 words
A directly-heating roller according to claim 11, wherein the wall thickness of said rolelr body is not greater than 1 mm.
Claim 15
Dependent Claim
34 words
A directly-heating roller according to claim 1, wherein said bonding layer is made of a material selected from a group which consists of Ni-Al-Mo alloy, Ni-Al alloy and Ni-Cr alloy, and is partially oxidized.
Claim 16
Dependent Claim
17 words
A directly-heating roller according to claim 1, wherein the side protective layers are made of PFA resin.
Claim 17
Dependent Claim
22 words
A directly-heating roller according to claim 15, wherein the offset preventing layer on the upper insulating layer is also made of PFA.
Claim 18
Dependent Claim
24 words
A directly-heating roller according to claim 1, wherein the offset preventing layer on the upper insulating layer is formed by means of electrostatic spraying.
Claim 19
Dependent Claim
19 words
A directly-heating roller according to claim 1, wherein the side protective layers are formed by means of resin impregtation.
Claim 20
Dependent Claim
51 words
A directly-heating roller according to claim 1, wherein the electrode layer is composed of an inner ring layer and an outer ring layer, and the inner ring layer has a thermal expansion coefficient between the thermal expansion coefficient of the heat generating resistance layer and one of the outer ring 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) | 1991-10-11 | 1992-04-11 | 1992-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-11 | 1996-04-11 | 1996-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-11 | 2000-04-11 | 2000-10-11 | $7700.00 | Window Closed / Lapsed |