EP0370519A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
An image fixing apparatus
Assignee: Canon Inc
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Filing: 1989-11-24
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Granted: —
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Expires: 2009-11-24
Abstract
Abstract An image fixing apparatus (20) includes a heater (21) which is fixed during an image fixing operation and which has a heat generating layer (28) in the form of a line; a film (23) movable in sliding contact with the heater (21), wherein a toner image on a recording material is heated by heat from the heater (21) through the film (23); wherein the heater produces amounts of heat which are different in a direction crossing with a movement direction of the recording material (P) in accordance with amount of heat transfer.
Inventors
- 👤 Shokyo Koh
- 👤 Shigeo Kimura
- 👤 Atsushi Hosoi
- 👤 Masahide Kinoshita
- 👤 Kensaku Kusaka
- 👤 Hiroyuki Adachi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 14:03
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2039; G03G15/2042; G03G2215/00; G03G2215/00172; G03G2215/00324
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
84 words
An image fixing apparatus, comprising: a heater which is fixed during an image fixing operation and which has a heat generating layer in the form of a line; a film movable in sliding contact with said heater, wherein a toner image on a recording material is heated by heat from said heater through said film; wherein said heater produces amounts of heat which are different in a direction crossing with a movement direction of the recording material in accordance with amount of heat transfer.
Claim 2
Dependent Claim
84 words
An image fixing apparatus, comprising: a heater which is fixed during an image fixing operation and which has a heat generating layer in the form of a line; a film movable in sliding contact with said heater, wherein a toner image on a recording material is heated by heat from said heater through said film; wherein said heater produces amounts of heat which are different in a direction crossing with a movement direction of the recording material in accordance with amount of heat transfer.
Claim 3
Dependent Claim
31 words
An apparatus according to Claim 1, wherein said heater has a variable heat generating width, wherein the heat generating width is controlled in accordance with a size of the recording material.
Claim 4
Dependent Claim
24 words
An apparatus according to Claim 1, said heat generating layer generates different amounts of heat at its central portion and at its marginal portions.
Claim 5
Dependent Claim
78 words
An image fixing apparatus, comprising: a heater having a linear heat generating layer extending in a direction crossing with a movement direction of an image supporting material supporting a toner image to be fixed; a film movable together with the image supporting material, wherein the toner image on the recording material is heated by heat from said heater through said film; and control means for controlling energy supply region in a longitudinal direction of said heat generating layer.
Claim 6
Dependent Claim
78 words
An image fixing apparatus, comprising: a heater having a linear heat generating layer extending in a direction crossing with a movement direction of an image supporting material supporting a toner image to be fixed; a film movable together with the image supporting material, wherein the toner image on the recording material is heated by heat from said heater through said film; and control means for controlling energy supply region in a longitudinal direction of said heat generating layer.
Claim 7
Dependent Claim
46 words
An apparatus according to Claim 4, wherein said heat generating layer is divided into plural regions in the longitudinal direction, wherein said control means controls the energy supply region by selecting the region or regions of said heat generating layer to be supplied with the energy.
Claim 8
Dependent Claim
27 words
An apparatus according to Claim 4, wherein said control means controls the energy supply region or regions in accordance with a size of the image supporting material.
Claim 9
Dependent Claim
76 words
An apparatus according to Claim 6, wherein said fixing apparatus is used in an image forming apparatus having an image forming station for forming the toner image which is not fixed, on the image supporting material, and wherein said image forming apparatus includes detecting means for detecting a size of the image supporting material, wherein said control means controls the power supply region in accordance with a signal representing the size from said size detecting means.
Claim 10
Dependent Claim
25 words
An apparatus according to Claim 6, wherein said control means controls such that only the portion substantially corresponding to the image supporting material is energized.
Claim 11
Dependent Claim
69 words
An apparatus according to Claim 4, wherein said image fixing apparatus is used in an image forming apparatus having an image forming station for forming the toner image which is not fixed, on the image supporting material, and wherein said image forming apparatus includes discriminating means fro discriminating an image region, and said control means controls the power supply region in accordance with a signal from said discriminating means.
Claim 12
Dependent Claim
29 words
An apparatus according to Claim 9, wherein said image forming apparatus is a copying apparatus for copying an original, and said discriminating means discriminates a region of the original.
Claim 13
Dependent Claim
22 words
An apparatus according to Claim 4, wherein said heater is fixed during use thereof, and wherein said film slides on said heater.
Claim 14
Dependent Claim
21 words
An apparatus according to Claim 11, wherein said heat generating layer and the toner image are contacted without air layer therebetween.
Claim 15
Dependent Claim
23 words
An apparatus according to Claim 12, wherein further comprising a pressing member for urging said film and said recording material toward said heater.
Claim 16
Dependent Claim
66 words
An image fixing apparatus, comprising: a heater having a linear heat generating layer extending in a detection crossing with a movement detection of a recording material; a film movable together with the recording material, wherein a toner image on the recording material is heated by heat from said heater through said film; wherein said heat generating layer has a resistance distribution in a longitudinal direction thereof.
Claim 17
Dependent Claim
66 words
An image fixing apparatus, comprising: a heater having a linear heat generating layer extending in a detection crossing with a movement detection of a recording material; a film movable together with the recording material, wherein a toner image on the recording material is heated by heat from said heater through said film; wherein said heat generating layer has a resistance distribution in a longitudinal direction thereof.
Claim 18
Dependent Claim
27 words
An apparatus according to Claim 14, wherein said heat generating layer has a smaller resistance per unit length at longitudinal marginal portions than at a central portion.
Claim 19
Dependent Claim
59 words
An apparatus according to Claim 14, further comprising a pressing member for urging said film and the recording material toward said pressing member having a pressing region which is shorter than a length of said heat generating layer, wherein said heat generating layer has a smaller resistance per unit length in a non-pressing region than in the pressing region.
Claim 20
Dependent Claim
61 words
An apparatus according to Claim 14, wherein said film slides on said heater during an fixing operation, and wherein said heat generating layer has a length larger than a width of said film, and said heat generating layer has a smaller electric resistance where it is not contacted to said film than a portion where it is contacted to said film.
Claim 21
Dependent Claim
35 words
An apparatus according to Claim 14, wherein said heat generating layer has a distribution of thickness in its longitudinal direction, and a resistance per unit length is different depending on a difference in the thickness.
Claim 22
Dependent Claim
36 words
An apparatus according to Claim 14, wherein said heat generating layer has a distribution of width in its longitudinal direction, and an electric resistance per unit length is different depending on a difference in the width.
Claim 23
Dependent Claim
36 words
An apparatus according to Claim 14, wherein said heat generating layer is made of different materials in its longitudinal direction, and an electric resistance per unit area is different depending on a difference in the material.
Claim 24
Dependent Claim
22 words
An apparatus according to Claim 14, wherein said heater is fixed during use thereof, and wherein said film slides on said heater.
Claim 25
Dependent Claim
21 words
An apparatus according to Claim 21, wherein said heat generating layer and the toner image are contacted without air layer therebetween.
Claim 26
Dependent Claim
23 words
An apparatus according to Claim 22, wherein further comprising a pressing member for urging said film and said recording material toward said heater.
References Cited (Backward Citations)
No citation records indexed.
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