EP0240730A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Directly heated roller for fuse-fixing toner images
Assignee: Proterial Ltd
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Filing: 1987-03-05
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Granted: —
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Expires: 2007-03-05
Abstract
Abstract The roller has a roller body (1) having a small heat capacity, a bonding layer (2) formed substantially uniformly on the outer peripheral surface of the roller body (1), a lower insulating layer (3) provided on the bonding layer (2); a heat generating layer (4) provided on the lower insulating layer (3) and having a ceramic materix 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, the heat generating layer (4) having substantially the same thermal expansion coefficient as the lower insulating layer (3), an upper insulating layer (5) provided on the heat generating layer (4), a protective layer (6) formed on the upper insulating layer (5) so as to prevent offset of the toner images, and an electrode layer (7) formed on each end of the roller and adapted to connect the heat generating layer (4) to an external power source.
Inventors
- 👤 Tsutomu Iimura
- 👤 Ryoichi Shibata
- 👤 Yukiharu Takada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 20:52
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; H; H05; H05B; H05B3/00; H05B3/0095; G03G15/2003; G03G15/2014; G03G15/2053; G03G15/2057
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
171 words
A directly-heating roller for fuse-fixing toner images comprising: (a) a roller body (1) having a small heat capacity; (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 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, said heat generating layer (4) having substantially the same thermal expansion coefficient as said lower insulating layer; (e) an upper insulating layer (5) provided on said heat generating layer (4); (f) a protective layer (6) formed on said upper insulating layer (5) so as to prevent offset of said toner images; and (g) an electrode layer (7) formed on each of said roller and adapted to connect said heat generating layer (4) to an external power source.
Claim 2
Dependent Claim
171 words
A directly-heating roller for fuse-fixing toner images comprising: (a) a roller body (1) having a small heat capacity; (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 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, said heat generating layer (4) having substantially the same thermal expansion coefficient as said lower insulating layer; (e) an upper insulating layer (5) provided on said heat generating layer (4); (f) a protective layer (6) formed on said upper insulating layer (5) so as to prevent offset of said toner images; and (g) an electrode layer (7) formed on each of said roller and adapted to connect said heat generating layer (4) to an external power source.
Claim 3
Dependent Claim
31 words
the roller of 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
23 words
The roller of claim 2, wherein said Ni-CR alloy essentially consists of 5 to 20 wt% of Cr and the balance substantially Ni.
Claim 5
Dependent Claim
12 words
The roller of claim 2 or 3, wherein said ceramic is Al₂O₃.
Claim 6
Dependent Claim
28 words
The roller of any of claims 1 to 3, wherein said heat insulating layers (3, 5) have thermal expansion coefficient which is not smaller than 6 × 10⁻⁶/deg.
Claim 7
Dependent Claim
20 words
The roller of claim 5, wherein said lower insulating layer (3) has a thickness ranging between 200 and 500 µm.
Claim 8
Dependent Claim
31 words
The roller of claim 6, wherein said lower insulating layer (3) has a thickness of about 300 µm, while said upper insulating layer (5) has a thickness of about 100 µm.
Claim 9
Dependent Claim
30 words
The roller of any of claims 5 to 7, wherein said heat insulating layers (3, 5) are made of an oxide selected from Al₂O₃, MgO, ZrO₂, MgAl₂O₄, ZrO₂.SiO₂, and MnO.NiO.
Claim 10
Dependent Claim
19 words
the roller of any of claims 1 to 8, wherein the roller is made of iron or iron alloy.
Claim 11
Dependent Claim
29 words
The roller of any of claims 1 to 9, wherein the wall thickness of said roller body is not greater than 2 mm, preferably not greater than 1 mm.
Claim 12
Dependent Claim
32 words
The roller of any of claims 1 to 10, wherein said bonding layer (2) is made of a material selected from Ni-Al-Mo alloy, Ni-Al alloy and Ni-Cr alloy, and is partially oxidized.
Claim 13
Dependent Claim
223 words
A directly-heating roller for fuse-fixing toner images comprising: (a) an iron roller body (1) having a wall thickness not greater than 1 mm; (b) a bonding layer (2) formed substantially uniformly on the outer peripheral surface of said body (1), said bonding layer (2) being formed from a material selected from Ni-Al-Mo alloy, Ni-Al alloy and Ni-Cr alloy and partially oxidized; (c) a lower insulating layer (3) provided on said bonding layer (2) and formed of a ceramic having a thermal expansion coefficient not smaller than 6 × 10⁻⁶/deg, said lower insulating layer having a thickness ranging between 200 and 500 µm; (d) a heat generating layer (4) provided on said lower insulating layer (3) and having an Al₂O₃ matrix and an Ni-Cr alloy resistance layer constituted by an Ni-Cr alloy dispersed in said matrix, said Ni-Cr alloy resistance layer extending substantially continuously in the lengthwise direction of said roller; (e) an upper insulating layer (5) provided on said heat generating layer (4) and having substantially the same properties as said lower insulating layer (3); (f) a protective layer (6) formed on said upper insulating layer (5) so as to prevent offset of said toner images; and (g) and electrode layer (7) formed on each end of said roller and adapted to connect said heat generating layer (4) to an external power source.
Claim 14
Dependent Claim
223 words
A directly-heating roller for fuse-fixing toner images comprising: (a) an iron roller body (1) having a wall thickness not greater than 1 mm; (b) a bonding layer (2) formed substantially uniformly on the outer peripheral surface of said body (1), said bonding layer (2) being formed from a material selected from Ni-Al-Mo alloy, Ni-Al alloy and Ni-Cr alloy and partially oxidized; (c) a lower insulating layer (3) provided on said bonding layer (2) and formed of a ceramic having a thermal expansion coefficient not smaller than 6 × 10⁻⁶/deg, said lower insulating layer having a thickness ranging between 200 and 500 µm; (d) a heat generating layer (4) provided on said lower insulating layer (3) and having an Al₂O₃ matrix and an Ni-Cr alloy resistance layer constituted by an Ni-Cr alloy dispersed in said matrix, said Ni-Cr alloy resistance layer extending substantially continuously in the lengthwise direction of said roller; (e) an upper insulating layer (5) provided on said heat generating layer (4) and having substantially the same properties as said lower insulating layer (3); (f) a protective layer (6) formed on said upper insulating layer (5) so as to prevent offset of said toner images; and (g) and electrode layer (7) formed on each end of said roller and adapted to connect said heat generating layer (4) to an external power source.
Claim 15
Dependent Claim
44 words
The roller of claim 12, wherein said insulating layers (3, 5) are made of MgAl₂O₄ or Al₂O₃, while said heat generating layer (4) is formed of a material essentially consisting of 10 to 35 wt% of an Ni-Cr alloy and the balance substantially ceramic.
References Cited (Backward Citations)
EP0147170A2
Cited
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