US6181905B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image heating apparatus
Assignee: Canon Inc
•
Filing: 2000-01-11
•
Granted: 2001-01-30
•
Expires: 2020-01-11
Abstract
Abstract The present invention relates to an image heating apparatus, in which an end of a first magnetic portion and an end of a second magnetic portion are present within a width along a recording material moving direction of a nip, and a width of a gap along a recording material moving direction is different with respect to a direction which is orthogonal to the recording material moving direction.
Inventors
- 👤 Tomoichiro Ohta
- 👤 Takashi Fujita
- 👤 Osamu Watanabe
- 👤 Ryuichiro Maeyama
- 👤 Yasuhiro Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:45
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/10; H05B6/14; H05B6/145; G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2053
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
194 words
An image heating apparatus comprising: a rotary member; a coil for generating a magnetic flux; a first magnetic portion and a second magnetic portion for guiding the magnetic flux generated by said coil; and wherein an end of said first magnetic portion is disposed opposite to an end of said second magnetic portion with a gap, and the magnetic flux is guided by said first magnetic portion and said second magnetic portion via said rotary member, and wherein the magnetic flux generates an eddy current in said rotary member, and said rotary member generates heat by the eddy current, a roller for forming a nip with said rotary member; wherein a recording material bearing an image is pinched and conveyed by said nip, and the image is heated by a heat of said rotary member, and wherein the end of said first magnetic portion and the end of said second magnetic portion are present within a width along a recording material moving direction of said nip, and a width of said gap along the recording material moving direction is different with respect to a direction which is orthogonal to the recording material moving direction.
Claim 2
Dependent Claim
194 words
An image heating apparatus comprising: a rotary member; a coil for generating a magnetic flux; a first magnetic portion and a second magnetic portion for guiding the magnetic flux generated by said coil; and wherein an end of said first magnetic portion is disposed opposite to an end of said second magnetic portion with a gap, and the magnetic flux is guided by said first magnetic portion and said second magnetic portion via said rotary member, and wherein the magnetic flux generates an eddy current in said rotary member, and said rotary member generates heat by the eddy current, a roller for forming a nip with said rotary member; wherein a recording material bearing an image is pinched and conveyed by said nip, and the image is heated by a heat of said rotary member, and wherein the end of said first magnetic portion and the end of said second magnetic portion are present within a width along a recording material moving direction of said nip, and a width of said gap along the recording material moving direction is different with respect to a direction which is orthogonal to the recording material moving direction.
Claim 3
Dependent Claim
38 words
An image heating apparatus according to claim 1 , wherein the width of said gap is smaller in an end portion than in a central portion with respect to the direction orthogonal to the recording material moving direction.
Claim 4
Dependent Claim
45 words
An image heating apparatus according to claim 1 , further comprising a third magnetic portion wound with said coil, wherein said first magnetic portion and said second magnetic portion are disposed on both ends of said third magnetic portion in the recording material moving direction.
Claim 5
Dependent Claim
44 words
An image heating apparatus according to claim 3 , wherein when seen from the direction orthogonal to the recording material moving direction, said first magnetic portion and said second magnetic portion are of J shape, and said third magnetic portion is of I shape.
Claim 6
Dependent Claim
38 words
An image heating apparatus according to claim 3 , wherein when seen from the direction orthogonal to the recording material moving direction, said first magnetic portion, said second magnetic portion, and said third magnetic portion form C shape.
Claim 7
Dependent Claim
26 words
An image heating apparatus according to claim 3 , wherein said first magnetic portion, said second magnetic portion and said third magnetic portion are integrally disposed.
Claim 8
Dependent Claim
27 words
An image heating apparatus according to claim 1 , wherein said coil, said first magnetic portion and said second magnetic portion are present inside said rotary member.
Claim 9
Dependent Claim
16 words
An image heating apparatus according to claim 1 , wherein said rotary member is a roller.
Claim 10
Dependent Claim
17 words
An image heating apparatus according to claim 1 , wherein said rotary member is an endless film.
Claim 11
Dependent Claim
34 words
An image heating apparatus according to claim 1 , wherein the recording material bearing an unfixed image is pinched and conveyed by said nip, and the unfixed image is fixed onto the recording material.
References Cited (Backward Citations)
US5568240A
Cited
US5552582A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-01-30 | 2004-07-31 | 2005-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-01-30 | 2008-07-31 | 2009-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-01-30 | 2012-07-31 | 2013-01-30 | $7700.00 | Window Closed / Lapsed |