EP0753799A2
Expired / Lapsed
EP
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Image heating apparatus
Assignee: Canon Inc
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Filing: 1996-07-11
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Granted: —
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Expires: 2016-07-11
Abstract
Abstract An image heating apparatus is provided with: a moving member (1) having an electrically conductive layer and arranged to move together with a recording medium (P), an exciting coil (201) for generating a magnetic flux, wherein the magnetic flux generated by the exciting coil (201) generates eddy currents in the moving member and the eddy currents make the moving member generate heat, wherein the heat of the moving member heats an image on the recording medium (P), a magnetic member (202) for guiding the magnetic flux generated by the exciting coil (201), wherein the moving member (1) and the magnetic member (202) form a substantially closed magnetic circuit, wherein an angle ϑ [rad] formed between a principal line of magnetic force directed from the magnetic member to the moving member and a principal line of magnetic force directed from the moving member to the magnetic member is determined to be 0 < θ < π.
Inventors
- 👤 Hideo Nanataki
- 👤 Hiroki Kisu
- 👤 Atsuyoshi Abe
- 👤 Tetsuya Sano
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 06:05
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2053; H; H05; H05B; H05B6/00; H05B6/02; H05B6/10; H05B6/14; H05B6/145; G03G2215/00; G03G2215/20; G03G2215/2003
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
144 words
An image heating apparatus comprising: a moving member having an electrically conductive layer and arranged to move together with a recording medium; an exciting coil for generating a magnetic flux, wherein the magnetic flux generated by said exciting coil generates eddy currents in said moving member and the eddy currents make said moving member generate heat, wherein the heat of said moving member heats an image on the recording medium; a magnetic member for guiding the magnetic flux generated by said exciting coil, wherein said moving member and said magnetic member form a substantially closed magnetic circuit, wherein an angle θ [rad] formed between a principal line of magnetic force directed from said magnetic member to said moving member and a principal line of magnetic force directed from said moving member to said magnetic member is determined to be 0 < θ < π.
Claim 2
Dependent Claim
15 words
The image heating apparatus according to Claim 1, wherein preferably, π/6 < θ < 5π/6.
Claim 3
Dependent Claim
16 words
The image heating apparatus according to Claim 1, wherein said magnetic member is a high-permeability member.
Claim 4
Dependent Claim
29 words
The image heating apparatus according to Claim 1, wherein said magnetic member has a first portion and a second portion ends of which are opposed to said moving member.
Claim 5
Dependent Claim
20 words
The image heating apparatus according to Claim 4, wherein said first portion and said second portion are linear plate members.
Claim 6
Dependent Claim
61 words
The image heating apparatus according to Claim 4, which has a back-up member for forming a nip together with said moving member, wherein the end of said first portion is opposed to said nip, and the end of said second portion is opposed to said moving member upstream and downstream of said nip in a moving direction of said moving member.
Claim 7
Dependent Claim
18 words
The image heating apparatus according to Claim 6, wherein said exciting coil is wound around said first portion.
Claim 8
Dependent Claim
19 words
The image heating apparatus according to Claim 1, wherein said magnetic member is divided into a plurality of blocks.
Claim 9
Dependent Claim
17 words
The image heating apparatus according to Claim 8, wherein said plurality of blocks have different Curie points.
Claim 10
Dependent Claim
31 words
The image heating apparatus according to Claim 9, wherein said plurality of blocks have respective Curie points lower on a far side than on a near side from said moving member.
Claim 11
Dependent Claim
26 words
The image heating apparatus according to Claim 1, wherein said magnetic member is elongated in a direction perpendicular to a moving direction of said moving member.
Claim 12
Dependent Claim
22 words
The image heating apparatus according to Claim 11, wherein said exciting coil is wound along a longitudinal direction of said magnetic member.
Claim 13
Dependent Claim
16 words
The image heating apparatus according to Claim 1, wherein said moving member is an endless film.
Claim 14
Dependent Claim
34 words
The image heating apparatus according to Claim 1, which has a back-up member to form a nip together with said moving member, wherein said nip fixes an unfixed toner image on the recording medium.
Claim 15
Dependent Claim
106 words
An image heating apparatus comprising: a moving member having an electrically conductive layer and arranged to move together with a recording medium; an exciting coil for generating a magnetic flux, wherein the magnetic flux generated by said exciting coil generates eddy currents in said moving member and the eddy currents make said moving member generate heat, wherein the heat of said moving member heats an image on the recording medium; a magnetic member for guiding the magnetic flux generated by said exciting coil, wherein said magnetic member is of a T-shaped form when seen along a direction perpendicular to a moving direction of said moving member.
Claim 16
Dependent Claim
16 words
The image heating apparatus according to Claim 15, wherein said magnetic member is a high-permeability member.
Claim 17
Dependent Claim
29 words
The image heating apparatus according to Claim 15, wherein said magnetic member has a first portion and a second portion ends of which are opposed to said moving member.
Claim 18
Dependent Claim
20 words
The image heating apparatus according to Claim 17, wherein said first portion and said second portion are linear plate members.
Claim 19
Dependent Claim
60 words
The image heating apparatus according to19 Claim 17, which has a back-up member for forming a nip together with said moving member, wherein the end of said first portion is opposed to said nip, and ends of said second portion are opposed to said moving member upstream and downstream of said nip in a moving direction of said moving member.
Claim 20
Dependent Claim
18 words
The image heating apparatus according to Claim 19, wherein said exciting coil is wound around said first portion.
Claim 21
Dependent Claim
19 words
The image heating apparatus according to Claim 15, wherein said magnetic member is divided into a plurality of blocks.
Claim 22
Dependent Claim
17 words
The image heating apparatus according to Claim 21, wherein said plurality of blocks have different Curie points.
Claim 23
Dependent Claim
31 words
The image heating apparatus according to Claim 22, wherein said plurality of blocks have respective Curie points lower on a far side than on a near side from said moving member.
Claim 24
Dependent Claim
26 words
The image heating apparatus according to Claim 15, wherein said magnetic member is elongated in a direction perpendicular to a moving direction of said moving member.
Claim 25
Dependent Claim
22 words
The image heating apparatus according to Claim 24, wherein said exciting coil is wound along a longitudinal direction of said magnetic member.
Claim 26
Dependent Claim
16 words
The image heating apparatus according to Claim 15, wherein said moving member is an endless film.
Claim 27
Dependent Claim
34 words
The image heating apparatus according to Claim 15, which has a back-up member to form a nip together with said moving member, wherein said nip fixes an unfixed toner image on the recording medium.
Claim 28
Dependent Claim
22 words
The image heating apparatus according to Claim 15, wherein said moving member and said magnetic member form a substantially closed magnetic circuit.
References Cited (Backward Citations)
No citation records indexed.
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