EP0241714A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Directly-heated roller for fixing toner images
Assignee: Proterial Ltd
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Filing: 1987-03-12
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Granted: —
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Expires: 2007-03-12
Abstract
Abstract The roller has a roller body (1) having a small electrical resistivity, a bonding layer (2) formed substantially uniformly on the outer peripheral surface of the roller body, a lower insulating layer (3) provided on the bonding layer; a heat generating layer (4) provided on the lower insulating layer and having 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, an upper insulating layer (7) provided on the heat generating layer (4), a protective layer (8) formed on the upper insulating layer (7) so as to prevent offset of the toner images, an electrode layer (5) formed on each end of the roller and adapted to connect the heat generating layer (4) to an external power source; and side protective layers (1Oa) covering at least the side surface of the heat generating layer (4), and the side surfaces and the axially outside surfaces of the lower insulating layer (3).
Inventors
- 👤 Ryoichi Shibata
- 👤 Tsutomu Iimura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 17:48
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
180 words
A directly-heating roller for fixing toner images comprising: (a) a roller body (1) having a small resistivity; (b) a bonding layer (2) formed substantially uniformly on the outer peripheral surface of said roller body (1); (c) a lower insulating layer (3) provided on said bonding layer (2); (d) a heat generating resistance layer (4) provided on said lower insulating layer (3) 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 (1); (e) an upper insulting layer (7) provided on said heat generating layer (4); (f) an offset preventing layer (8) formed on said upper insulating layer (7) so as to prevent offset of said toner images; (g) an electrode layer (5) formed on each end of said roller and adapted to connect said heat generating layer (4) to an external power source; and (h) side protective layers (1Oa) formed at least on the side surfaces of the lower insulating layer and on the heat generating layer.
Claim 2
Dependent Claim
180 words
A directly-heating roller for fixing toner images comprising: (a) a roller body (1) having a small resistivity; (b) a bonding layer (2) formed substantially uniformly on the outer peripheral surface of said roller body (1); (c) a lower insulating layer (3) provided on said bonding layer (2); (d) a heat generating resistance layer (4) provided on said lower insulating layer (3) 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 (1); (e) an upper insulting layer (7) provided on said heat generating layer (4); (f) an offset preventing layer (8) formed on said upper insulating layer (7) so as to prevent offset of said toner images; (g) an electrode layer (5) formed on each end of said roller and adapted to connect said heat generating layer (4) to an external power source; and (h) side protective layers (1Oa) formed at least on the side surfaces of the lower insulating layer and on the heat generating layer.
Claim 3
Dependent Claim
34 words
A directly-heating roller according to claim 1, wherein said metallic resistance layer (4) is made of a material essentially consisting of 1O 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 to 2O wt% of Cr and the balance substantially Ni.
Claim 5
Dependent Claim
14 words
A directly-heating roller according to claim 2 or 3, wherein said ceramic is Al₂O₃.
Claim 6
Dependent Claim
31 words
A directly-heating roller according to any of the claims 1 to 4, wherein said heat insulating layers (3,7) have a thermal expansion coefficient which is not smaller than 6 × 1O⁻⁶/deg.
Claim 7
Dependent Claim
27 words
A directly-heating roller according to any of the claims 1 to 5, wherein said lower insulating layer (3) has a thickness ranging between 2OO and 5OO µm.
Claim 8
Dependent Claim
32 words
A directly-heating roller according to claim 6, wherein said lower insulating layer (3) has a thickness of about 3OO µm, while said upper insulating layer has a thickness of about 1OO µm.
Claim 9
Dependent Claim
37 words
A directly-heating roller according to any of the claims 1 to 7, wherein said heat insulating layers (3, 7) are made of an oxide selected from a group consisting of Al₂O₃, MgO, ZrO₂, MgAl₂O₄, ZrO₂·SiO₂, and MnO·NiO.
Claim 10
Dependent Claim
12 words
A directly-heating roller according to claim 8, wherein said oxide is MgAl₂O₄.
Claim 11
Dependent Claim
13 words
1O. A directly-heating roller according to claim 8, wherein said oxide is Al₂O₃.
Claim 12
Dependent Claim
24 words
A directly-heating roller according to any of the claims 1 to 1O, wherein the roller body (1) is made of iron or iron alloy.
Claim 13
Dependent Claim
26 words
A directly-heating roller according to any of the claims 1 to 11, wherein the wall thickness of said roller body is not greater than 2 mm.
Claim 14
Dependent Claim
22 words
A directly-heating roller according to claim 11, wherein the wall thickness of said roller body (1) is not greater than 1 mm.
Claim 15
Dependent Claim
40 words
A directly-heating roller according to any of the claims 1 to 13, wherein said bonding layer (2) 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
23 words
A directly-heating roller according to any of the claims 1 to 14, wherein the side protective layers (10a) are made of PFA resin.
Claim 17
Dependent Claim
27 words
A directly-heating roller according to any of the claims 1 to 15, wherein the offset preventing layer (8) on the upper insulating layer is made of PFA.
Claim 18
Dependent Claim
31 words
A directly-heating roller according to any of the claims 1 to 16, wherein the offset preventing layer (8) on the upper insulating layer (7) is formed by means of electrostatic spraying.
Claim 19
Dependent Claim
24 words
A directly-heating roller according to any of the claims 1 to 16, wherein the side protective layers are formed by means of resin impregnation.
Claim 20
Dependent Claim
62 words
A directly-heating roller according to any of the claims 1 to 18, wherein the electrode layer (5) is composed of an inner ring layer (5b) and an outer ring layer (5a), and the inner ring layer has a thermal expansion coefficient between the thermal expansion coefficient of the heat generating resistance layer (4) and that one of the outer ring layer (5b).
References Cited (Backward Citations)
EP0147170A2
Cited
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