EP0523638A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Fixing device capable of controlling heating overshoot
Assignee: Canon Inc
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Filing: 1992-07-14
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Granted: —
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Expires: 2012-07-14
Abstract
Abstract An image heating device (3) which includes a heater (6); a temperature detecting element (4) to detect a temperature of the heater (6); and a controller (8) for controlling power supply to the heater (6), so that the temperature detected by the temperature detecting member (4) is maintained at a predetermined temperature; wherein the controller (8) controls the power supply to the heater (6), based on a rising speed of the temperature detected during a period from the time when the power supply to the heater (6) is started till the time when the temperature reaches the predetermined temperature. Also used for a fixing device having a heating roller and a pressure roller.
Inventors
- 👤 Yohji C/O Canon Kabushiki Kaisha Tomoyuki
- 👤 Shunji c/o Canon Kabushiki Kaisha Nakamura
- 👤 Yasumasa C/O Canon Kabushiki Kaisha Ohtsuka
- 👤 Kouichi C/O Canon Kabushiki Kaisha Okuda
- 👤 Eihiro C/O Canon Kabushiki Kaisha Sakaki
- 👤 Akira C/O Canon Kabushiki Kaisha Hayakawa
- 👤 Daizo C/O Canon Kabushiki Kaisha Fukuzawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 04:35
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2039; G03G15/2053; G03G2215/00; G03G2215/20; G03G2215/2003; G03G2215/2016; G03G2215/2035; G03G2215/2038
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
90 words
An image heating device which comprises: a heater; a temperature detecting element to detect a temperature of said heater; and control means for controlling power supply to said heater, so that the temperature detected by said temperature detecting member is maintained at a predetermined temperature; wherein said control means controls the power supply to said heater, based on a rising speed of the temperature detected during a period from the time when the power supply to said heater is started till the time when the temperature reaches the predetermined temperature.
Claim 2
Dependent Claim
43 words
An image bearing device in accordance with Claim 1, wherein said device further comprises an endless sheet of film which moves together with the recording material carrying an image, and the image is heated through said film by the heat from said heater.
Claim 3
Dependent Claim
25 words
An image heating device in accordance with Claim 2, wherein said heater remains stationary in use, and said film slides in contact with said heater.
Claim 4
Dependent Claim
60 words
An image heating device in accordance with Claim 1, wherein said control means supplies the power to said heater during both periods when the temperature of the thermostatically controlled heater is to be raised and when it is to be lowered, in order to control the power supply during said both periods, based on the said rising speed of temperature.
Claim 5
Dependent Claim
36 words
An image heating device in accordance with Claim 1, wherein said rising speed of temperature is detected while the temperature of said heater is within a range above 100 o C but below said predetermined temperature.
Claim 6
Dependent Claim
54 words
An image heating device which comprises: a heater maintained to keep a predetermined temperature; a temperature detecting element to detect the temperature of said heater; and power supply control means for controlling the power supply to said heater, based on the temperature gradient of said heater, and a temperature deviation from said predetermined temperature.
Claim 7
Dependent Claim
43 words
An image heating device in accordance with Claim 6, wherein said device further comprises an endless sheet of film which moves together with the recording material carrying an image, and the image is heated through said film by the heat from said heater.
Claim 8
Dependent Claim
25 words
An image heating device in accordance with Claim 7, wherein said heater remain stationary in use, and said film slides in contact with said heater.
Claim 9
Dependent Claim
33 words
An image heating device in accordance with Claim 1, wherein said power supply control means is provided with more than one power supply patterns based on the temperature deviation and the temperature gradient.
Claim 10
Dependent Claim
103 words
An image heating device which comprises: heater controlled to keep a predetermined temperature; temperature detecting element to detect a temperature of said heater; arithmetic means for computing the length of time it takes for the temperature of said heater to reach said predetermined temperature since the beginning of the power supply, based on the temperature gradient of said heater; and control means for halting the power supply to said heater after an elapse of the length of time computed by said arithmetic means, and then, controlling the power supply to said heater, so that the temperature of said heater is maintained at the
Claim 11
Dependent Claim
43 words
An image heating device in accordance with Claim 10, wherein said device further comprises an endless sheet of film which moves together with the recording material carrying an image, and the image is heated through said film by the heat from said heater.
Claim 12
Dependent Claim
25 words
An image heating device in accordance with Claim 11, wherein said heater remains stationary in use, and said film slides in contact with said heater.
Claim 13
Dependent Claim
22 words
An image heating device in accordance with Claim 10, wherein the power supply to said heater is halted for a predetermined duration.
References Cited (Backward Citations)
No citation records indexed.
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