Patent US5266774A successfully refreshed from Google Patents.
US5266774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Set temperature changeable image fixing apparatus
Assignee: Canon Inc
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Filing: 1992-10-20
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Granted: 1993-11-30
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Expires: 2012-10-20
Abstract
Abstract An image fixing apparatus includes a heater maintained at a controlled temperature; a film contacted to the heater and movable together with and in sliding contact with a recording material carrying a visualized image, wherein the visualized image is heated by the heater through the film; a temperature detecting element for detecting a temperature of the film or a member contacted to the film; and a controller for changing a level of the controlled temperature on the basis of an output of the temperature detecting element before start of an image fixing operation of the image fixing apparatus.
Inventors
- 👤 Shigeo Kimura
- 👤 Kensaku Kusaka
- 👤 Atsushi Hosoi
- 👤 Akira Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:52
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2039; G03G2215/00; G03G2215/20; G03G2215/2003; G03G2215/2016; G03G2215/2035; G03G2215/2038
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
99 words
An image fixing apparatus, comprising a heater for fixing an unfixed image; control means for controlling power supply to said heater so as to maintain a predetermined fixing temperature; a film contacted to said heater and movable together with a recording material carrying a visualized image, wherein the visualized image is heated by said heater through said film; a temperature detecting element for detecting a temperature of at least one of said film and a member contacted to said film; and means for changing said predetermined fixing temperature on the basis of an output of said temperature detecting element.
Claim 2
Dependent Claim
99 words
An image fixing apparatus, comprising a heater for fixing an unfixed image; control means for controlling power supply to said heater so as to maintain a predetermined fixing temperature; a film contacted to said heater and movable together with a recording material carrying a visualized image, wherein the visualized image is heated by said heater through said film; a temperature detecting element for detecting a temperature of at least one of said film and a member contacted to said film; and means for changing said predetermined fixing temperature on the basis of an output of said temperature detecting element.
Claim 3
Dependent Claim
43 words
An apparatus according to claim 1, wherein said temperature detecting element detects a temperature of said heater, and during the fixing operation, said control means controls power supply to said heater so that the fixing temperature is maintained substantially at the detected temperature.
Claim 4
Dependent Claim
24 words
An apparatus according to claim 1, wherein said predetermined temperature is determined by said control means before start of power supply to said heater.
Claim 5
Dependent Claim
25 words
An apparatus according to claim 1, wherein said temperature detecting element detects the temperature of a side of said film contactable to the visualized image.
Claim 6
Dependent Claim
36 words
An apparatus according to claim 1, wherein said temperature detecting element detects the temperature of the member contacted to a side of said film opposite from another side of said film contactable to the visualized image.
Claim 7
Dependent Claim
24 words
An apparatus according to claim 1, wherein said heater is fixed during fixing operation, and said film is in sliding contact with said heater.
Claim 8
Dependent Claim
53 words
An apparatus according to claim 6, wherein said heater comprises a base plate and a heat generating resistor layer on a film side of the base plate generating heat upon electric power supply thereto, and the heat from the heat generating resistor layer is transferred to the visualized image without air layer therebetween.
Claim 9
Dependent Claim
38 words
An apparatus according to claim 1, wherein the visualized image comprises powdery toner, and the recording material is separated from said film while a temperature of the toner is higher than a glass transition point of the toner.
Claim 10
Dependent Claim
17 words
An apparatus according to claim 1, wherein said film is in the form of an endless belt.
Claim 11
Dependent Claim
18 words
An apparatus according to claim 7, wherein a thickness of said film is not more than 100 microns.
Claim 12
Dependent Claim
18 words
An apparatus according to claim 10, wherein a thickness of said film is not more than 40 microns.
Claim 13
Dependent Claim
43 words
An image fixing apparatus according to claim 1, wherein said control means increases said power supply to said heater on the basis of the detected temperature of said temperature detecting element before start of an image fixing operation of said image fixing apparatus.
Claim 14
Dependent Claim
40 words
An apparatus according to claim 1, wherein said control means controls said power supply to said heater on the basis of an output of said temperature detecting element before start of an image fixing operation of said image fixing apparatus.
References Cited (Backward Citations)
US3578797A
Cited
US3811828A
Cited
US3810735A
Cited
US4161644A
Cited
US4566779A
Cited
US4780742A
Cited
EP0222120A1
Cited
EP0295901A2
Cited
US4954845A
Cited
US4998121A
Cited
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 |