US5267005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heater having stepped portion and heating apparatus using same
Assignee: Canon Inc
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Filing: 1991-12-31
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Granted: 1993-11-30
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Expires: 2011-12-31
Abstract
Abstract A heating apparatus includes a heater which is stationary in use; a film in sliding contact with the heater; a pressing member cooperative with the film to form a nip therebetween; wherein the heater is provided with a portion which is stepped in a direction away from the film toward downstream with respect to a movement direction of the film, the stepped portion being in a width of the nip.
Inventors
- 👤 Akira Yamamoto
- 👤 Jun Asai
- 👤 Atsushi Hosoi
- 👤 Kensaku Kusaka
- 👤 Yoshiaki Kobayashi
- 👤 Hidekazu Maruta
- 👤 Shigeo Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:01
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/20; H05B3/22; H05B3/26; H05B3/265; G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2064
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
70 words
A heating apparatus, comprising: a heater which is stationary in use; a film in sliding contact with said heater; a pressing member cooperative with said film to form a nip therebetween; wherein said heater is provided with a portion which is stepped in a direction away from said film toward downstream with respect to a movement direction of said film, said stepped portion being in a width of the nip.
Claim 2
Dependent Claim
70 words
A heating apparatus, comprising: a heater which is stationary in use; a film in sliding contact with said heater; a pressing member cooperative with said film to form a nip therebetween; wherein said heater is provided with a portion which is stepped in a direction away from said film toward downstream with respect to a movement direction of said film, said stepped portion being in a width of the nip.
Claim 3
Dependent Claim
23 words
An apparatus according to claim 1, wherein a step of said stepped portion has a step height of not less than 10 microns.
Claim 4
Dependent Claim
65 words
An apparatus according to claim 1, wherein said heater is provided with a heat generating resistor layer extending in a direction crossing with a movement direction of said film, said heat resistance layer generating heat upon electric power supply thereto, and wherein said stepped portion is provided at each of upstream and downstream sides of said resistance layer in a movement direction of said film.
Claim 5
Dependent Claim
15 words
An apparatus according to claim 1, wherein a plurality of such stepped portions are provided.
Claim 6
Dependent Claim
42 words
An apparatus according to claim 1, wherein said heater is provided with a resistance layer generating heat upon electric power supply thereto, and a base plate for supporting said resistor layer, wherein said stepped portion is provided by machining said base plate.
Claim 7
Dependent Claim
14 words
An apparatus according to claim 5, wherein said base plate is of ceramic material.
Claim 8
Dependent Claim
13 words
An apparatus according to claim 6, wherein the ceramic material is of alumina.
Claim 9
Dependent Claim
22 words
An apparatus according to claim 1, wherein said pressing member is in the form of a rotatable member having a rubber layer.
Claim 10
Dependent Claim
20 words
An apparatus according to claim 1, wherein said nip receives a recording material carrying an unfixed image to fix it.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-11-29 | 1997-05-31 | 1997-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-29 | 2001-05-31 | 2001-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-29 | 2005-05-31 | 2005-11-30 | $7700.00 | Window Closed / Lapsed |