EP3570114A1 - Heating device, fixing device, and image forming apparatus - Google Patents

Heating device, fixing device, and image forming apparatus Download PDF

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Publication number
EP3570114A1
EP3570114A1 EP18215082.1A EP18215082A EP3570114A1 EP 3570114 A1 EP3570114 A1 EP 3570114A1 EP 18215082 A EP18215082 A EP 18215082A EP 3570114 A1 EP3570114 A1 EP 3570114A1
Authority
EP
European Patent Office
Prior art keywords
resistance heating
temperature
heating elements
heating element
power
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP18215082.1A
Other languages
German (de)
English (en)
French (fr)
Inventor
Tomoya Adachi
Yuusuke Furuichi
Yukimichi Someya
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to EP23218622.1A priority Critical patent/EP4339709A3/en
Publication of EP3570114A1 publication Critical patent/EP3570114A1/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
    • G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
    • G03G15/2053—Structural details of heat elements, e.g. structure of roller or belt, eddy current, induction heating
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
    • G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
    • G03G15/2039—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat with means for controlling the fixing temperature
    • G03G15/2042—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat with means for controlling the fixing temperature specially for the axial heat partition
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/023—Industrial applications
    • H05B1/0241—For photocopiers
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/20—Details of the fixing device or porcess
    • G03G2215/2003—Structural features of the fixing device
    • G03G2215/2016—Heating belt
    • G03G2215/2019—Heating belt the belt not heating the toner or medium directly, e.g. heating a heating roller
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/20—Details of the fixing device or porcess
    • G03G2215/2003—Structural features of the fixing device
    • G03G2215/2016—Heating belt
    • G03G2215/2035—Heating belt the fixing nip having a stationary belt support member opposing a pressure member

Definitions

  • the present disclosure relates to a heating device including a plurality of resistance heating elements, a fixing device, and an image forming apparatus.
  • One type of fixing device heats a thin fixing belt having low heat capacity, with a planar heating body including a base and a resistance heating element.
  • the planer heating body includes a plurality of resistance heating elements arranged on the base disposed in the width direction of the fixing belt, the resistance heating elements being electrically connected in parallel.
  • This arrangement inhibits a rise in temperature in a no-paper passing portion when small-sized paper passes the planer heating body (refer to JP-2015-194713-A and JP-2016-18127-A ).
  • PTC positive temperature coefficient
  • the plurality of resistance heating elements is connected in parallel as described above, even when any one of the resistance heating elements disconnects, current continues to flow through the other resistance heating elements.
  • a temperature sensor such as a thermistor, is arranged in the heating region of each resistance heating element, the temperatures of the resistance heating elements can be individually controlled. Thus, no unusual rise occurs in temperature in each resistance heating element.
  • a temperature sensor is attached to only one resistance heating element at the center in the longitudinal direction.
  • the resistance heating element disconnects, current continuously increases in the other resistance heating elements.
  • a safety element such as a thermostat or a fuse, is arranged in the heating region of a resistance heating element as in FIG. 3C in JP-2015-194713-A , when the resistance heating element disconnects, the safety element does not function.
  • an object of the present disclosure is to provide a heating device, a fixing device, and an image forming apparatus that are capable of performing temperature control to a plurality of resistance heating elements in a planar heating body with as few temperature sensors as possible, so as to prevent an unusual rise in temperature.
  • a heating device includes a base; a plurality of resistance heating elements arranged in a longitudinal direction of the base and electrically connected in parallel to each other; a power controller configured to supply power to the plurality of resistance heating elements; a first temperature detector configured to detect a temperature of a first resistance heating element of the plurality of resistance heating elements; a second temperature detector configured to detect a temperature of a second resistance heating element of the plurality of resistance heating elements; a power interrupter configured to interrupt the power supplied from the power controller to the plurality of resistance heating elements when the temperature of the second resistance heating element becomes a predetermined temperature or more; and a controller configured to control the power controller such that a temperature of each of the plurality of resistance heating elements becomes a predetermined temperature, based on a result of detection of the first temperature detector, and to interrupt the power supplied from the power controller to the plurality of resistance heating elements when the second temperature detector detects predetermined temperature information regarding the second resistance heating element.
  • the second temperature detector detects the predetermined temperature information regarding the second resistance heating element and then the power supply to each resistance heating element is interrupted.
  • an unusual rise in temperature in each resistance heating element can be reliably prevented.
  • the “recording medium” is not limited to paper (sheet).
  • the “recording medium” include not only paper (sheet) but also an overhead projector (OHP) sheet, a fabric, a metallic sheet, a plastic film, and a prepreg sheet including carbon fibers previously impregnated with resin.
  • OHP overhead projector
  • Examples of the "recording medium” include a medium to which developer or ink can adhere, and so-called recording paper and recording sheets.
  • Examples of the "sheet” include thick paper, a postcard, an envelope, thin paper, coated paper (e.g., coat paper and art paper), and tracing paper, in addition to plain paper.
  • FIG. 1A is a schematic view of the configuration of a color laser printer 100 that is an image forming apparatus including a heating device 3000 and a fixing device 300, according to one embodiment of the present disclosure.
  • FIG. 1B simplifies and illustrates the principle of the laser printer 100.
  • the process units 1K, 1Y, 1M, and 1C have similar configurations except including toner bottles 6K, 6Y, 6M, and 6C housing unused toners in mutually different colors.
  • the configuration of the one process unit 1K will be described below, and the descriptions of the other process units 1Y, 1M, and 1C will be omitted.
  • An exposure device 7 is arranged above the process units 1K, 1Y, 1M, and 1C provided in the laser printer 100.
  • the exposure device 7 performs writing scanning in accordance with image information, namely, causes a mirror 7a to reflect a laser beam Lb from a laser diode to irradiate the image bearer 2K with the laser beam Lb, on the basis of image data.
  • the paired rollers 210 include a pair of an upper roller and a lower roller.
  • the paired rollers 210 can adopt a friction reverse roller (FRR) separation system or a friction roller (FR) separation system.
  • the FRR separation system presses a separation roller (return roller) to which a driving shaft has applied a certain amount of torque in the counter sheet feeding direction through a torque limiter, against a feed roller to separate a sheet with the nip between the rollers.
  • the FR separation system presses a separation roller (friction roller) supported by a secured shaft against a feed roller through a torque limiter to separate a sheet with the nip between the rollers.
  • the paired rollers 210 in the present embodiment adopt the FRR separation system. That is the paired rollers 210 include an upside feed roller 220 that conveys a sheet inside the machine and a downside separation roller 230 that gives a driving force in the reverse direction of the upside feed roller 220 with a driving shaft through a torque limiter.
  • the separation roller 230 is biased to the feed roller 220 by a biasing means, such as a spring. Note that transmission of the driving force of the feed roller 220 through a clutch, rotates the sheet feeding roller 60 left in FIG. 1A .
  • the sent-out sheet P has the toner image on the intermediate transfer belt 16, electrostatically transferred at a desirable transfer position with high accuracy by a bias applied at the secondary transfer nip.
  • a transfer cover 8 is disposed on the front side in the drawing direction of the sheet feeding device 200 above the sheet feeding device 200. Opening the transfer cover 8 enables an internal inspection of the laser printer 100.
  • the transfer cover 8 includes a manual sheet feeding roller 45 for manual sheet feeding and a manual sheet feeding tray 46 for manual sheet feeding.
  • the sheet P sent out by the sheet feeding roller 60 and the paired rollers 210 has slack when the front end of the sheet P arrives at the nip between the paired registration rollers 250, and then remains on standby.
  • An optimum timing of transferring the toner image on the intermediate transfer belt 16 to the sheet P (synchronization) is determined and additionally the front end skew of the sheet P is corrected.
  • the sheet P sent out to the reverse conveyance path 41 reaches the paired registration rollers 250 through the paired reverse conveyance rollers 43.
  • the paired registration rollers 250 determine an optimum timing of transferring the toner image on the intermediate transfer belt 16 to the face of the sheet P to which no toner image has been transferred (synchronization), and send out the sheet P to the secondary transfer nip.
  • the fixing device 300 nips the conveyed sheet P with the fixing belt 310 and the pressing roller 320, and fixes the unfixed toner image to the back face of the sheet P with heating and pressing.
  • the switching member 42 is located opening in proximity to the upper end of the post-fixing conveyance path 35, as indicated with the solid line of FIG. 1A , in the timing at which the fixing device 300 sends out the sheet P.
  • the sheet P sent out from the fixing device 300 is sent out to the sheet ejection path 36 through the post-fixing conveyance path 35.
  • the paired ejection rollers 37 nip the sheet P sent out to the sheet ejection path 36 and drive rotationally to eject the sheet P to the ejection tray 44. Then, the double-sided printing finishes.
  • the first temperature sensor TH1 for temperature control is disposed in the heating region of the resistance heating element 364 (the fourth from the left end) serving as a first resistance heating element in a central region in the longitudinal direction within a minimum paper passing width.
  • the second temperature sensor TH2 for safety protection and the power cutoff device CO are disposed in the heating region of the resistance heating element 368 (the eighth from the left end) (or the resistance heating element 361 (the first from the left end)) serving as a second resistance heating element at a farthest end portion in the longitudinal direction at which an extreme rise is more likely to occur in end-portion temperature.
  • the second temperature sensor TH2 and the power cutoff device CO can be arranged in the heating region of at least one of the other resistance heating elements 361 to 367.
  • the two temperature sensors TH1 and TH2 and the power cutoff device CO are disposed in the regions of the resistance heating elements 364 and 368 such that the gap between resistance heating elements at which a drop occurs in the amount of heat generation is avoided. This arrangement improves temperature controllability, and also facilitates disconnection detection in a case where disconnection occurs in part of the resistance heating elements.
  • the power control circuit includes an alternating-current power source 410, a triac 420, and the power cutoff device CO.
  • the alternating-current power source 410, the triac 420, and the power cutoff device CO are connected in series between the electrodes 360c and 360d.
  • the connector 502 has a base end supported by the first terminal 501.
  • the connector 502 is biased downward due to the elasticity of the connector 502.
  • the ejecting rod 504 couples the connector 502 and the central upper face of the bimetal 505 together.
  • the bimetal 505 inverts in an upward convex shape as in FIG. 5B due to a predetermined high temperature, the ejecting rod 504 pushes the connector 502 upward, so that an interruption is made between the first terminal 501 and the second terminal 503.
  • Temperatures T 4 and T 8 detected by the first temperature sensor TH1 and the second temperature sensor TH2 are input into a controller 400 serving as a controller.
  • the controller 400 controls the amount of supply power to the electrodes 360c and 360d with the triac 420 such that each of the resistance heating elements 361 to 368 has a predetermined temperature, on the basis of the temperature T 4 acquired from the first temperature sensor TH1.
  • the controller 400 interrupts the power supply from the alternating-current power source 410 to the resistance heating elements 361 to 368.
  • the controller 400 can include a microcomputer including a central processing unit (CPU), a read-only memory (ROM), a random-access memory (RAM), and an input and output (I/O) interface.
  • CPU central processing unit
  • ROM read-only memory
  • RAM random-access memory
  • I/O input and output interface
  • the first fixing device includes: a thin fixing belt 310 having low heat capacity; and a pressing roller 320.
  • the fixing belt 310 includes, for example, a tubular base made of polyimide (PI), the tubular base having an outer diameter of 25 mm and a thickness of from 40 to 120 ⁇ m.
  • PI polyimide
  • An elastic layer made of rubber having a thickness of from 50 to 500 ⁇ m may be provided between the base and the release layer.
  • the base of the fixing belt 310 is not limited to polyimide, and thus may be made of a thermal resistance resin, such as polyetheretherketone (PEEK), or a metal, such as nickel (Ni) or stainless steel (SUS).
  • PEEK polyetheretherketone
  • Ni nickel
  • SUS stainless steel
  • the inner circumferential face of the fixing belt 310 may be coated with polyimide or PTFE as a slide layer.
  • a gap is formed between adjacent ones of the resistance heating elements 361 to 368 to ensure insulation. If the gap is too large, fixing unevenness would occur due to a decrease in the amount of heat generated in the gap. By contrast, if the gap is too small, a short circuit would occur between the resistance heating elements 361 to 368.
  • the size of the gap is preferably from 0.3 mm to 1 mm, and more preferably from 0.4 mm to 0.7 mm. As described above, heating the fixing nip SN via the base 350 can reduce fixing unevenness due to the gap between the resistance heating elements 361 to 368.
  • the resistance heating elements 361 to 368 can be each made of a material having a positive temperature coefficient (PTC) characteristic.
  • the material having the PTC characteristic has a characteristic that the resistance value rises (the current I decreases and the heater output decreases) as the temperature T rises.
  • the temperature coefficient of resistance (TCR) may be, for example, 1500 parts per million (PPM).
  • PPM parts per million
  • an L-shaped cut-away step is formed at each of the end portions of the resistance heating elements 361 to 368, so that the step overlaps the step of the end portion of the adjacent resistance heating element.
  • an oblique cut-away inclination is formed at each of the end portions of the resistance heating elements 361 to 368, so that the inclination overlaps the inclination of the end portion of the adjacent resistance heating element.
  • the second temperature sensor TH2 is disposed in the heating region of the resistance heating element 368 at the end portion, in the present embodiment.
  • the "predetermined temperature information” includes not only that the temperature T 8 of the resistance heating element 368 satisfies T 8 ⁇ T N . That is the "predetermined temperature information” includes: (i) the temperature of the resistance heating element 368 is less than the predetermined temperature (T 8 ⁇ T N ); (ii) the time until the temperature of the resistance heating element 368 reaches the predetermined temperature, is a predetermined time or more; and (iii) a variation in the temperature gradient is a predetermined value or less.
  • the controller 400 starts temperature control of the heating member 360.
  • the second temperature sensor TH2 detects the temperature T 8 of the resistance heating element 368.
  • the controller 400 determines whether the temperature T 8 satisfies T 8 ⁇ T N (T N : predetermined temperature).
  • T 8 ⁇ T N the controller 400 determines as occurrence of unusual low temperature (disconnection), interrupts (cuts OFF) the power supply to the heating member 360, and at S7 displays an error display on an operation panel of the color laser printer 100.
  • T 8 ⁇ T N is satisfied, the controller 400 determines as no occurrence of unusual low temperature and starts printing operation at step S8.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fixing For Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Control Of Resistance Heating (AREA)
EP18215082.1A 2017-12-26 2018-12-21 Heating device, fixing device, and image forming apparatus Withdrawn EP3570114A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP23218622.1A EP4339709A3 (en) 2017-12-26 2018-12-21 Heating device, fixing device, and image forming apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017249230 2017-12-26
JP2018237465A JP7302167B2 (ja) 2017-12-26 2018-12-19 加熱装置、定着装置及び画像形成装置

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP23218622.1A Division EP4339709A3 (en) 2017-12-26 2018-12-21 Heating device, fixing device, and image forming apparatus

Publications (1)

Publication Number Publication Date
EP3570114A1 true EP3570114A1 (en) 2019-11-20

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EP18215082.1A Withdrawn EP3570114A1 (en) 2017-12-26 2018-12-21 Heating device, fixing device, and image forming apparatus
EP23218622.1A Pending EP4339709A3 (en) 2017-12-26 2018-12-21 Heating device, fixing device, and image forming apparatus

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP23218622.1A Pending EP4339709A3 (en) 2017-12-26 2018-12-21 Heating device, fixing device, and image forming apparatus

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EP (2) EP3570114A1 (enExample)
JP (2) JP7302167B2 (enExample)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4009111A1 (en) * 2020-12-01 2022-06-08 Ricoh Company, Ltd. Fixing device and image forming apparatus
CN116802567A (zh) * 2021-01-28 2023-09-22 信越聚合物株式会社 定影垫

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7302167B2 (ja) * 2017-12-26 2023-07-04 株式会社リコー 加熱装置、定着装置及び画像形成装置
JP2021117298A (ja) * 2020-01-23 2021-08-10 株式会社リコー 加熱装置および画像形成装置
JP7620877B2 (ja) 2021-03-12 2025-01-24 株式会社リコー 定着装置及び画像形成装置
JP7630769B2 (ja) * 2021-07-05 2025-02-18 株式会社リコー 加熱装置、定着装置、画像形成装置

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Publication number Priority date Publication date Assignee Title
JP2001242740A (ja) * 2000-02-28 2001-09-07 Canon Inc 定着装置及びこの定着装置を備える画像形成装置
US20090245900A1 (en) * 2008-03-31 2009-10-01 Toshiaki Kagawa Fixing apparatus and image forming apparatus including the same
US20100303525A1 (en) * 2009-05-26 2010-12-02 Tetsunori Mitsuoka Fixing device and image forming apparatus including fixing device
EP2711778A2 (en) * 2012-09-19 2014-03-26 Canon Kabushiki Kaisha Heater and image heating device mounted with heater
JP2015194713A (ja) 2014-03-19 2015-11-05 キヤノン株式会社 像加熱装置及び像加熱装置に用いるヒータ
JP2016018127A (ja) 2014-07-09 2016-02-01 キヤノン株式会社 画像加熱装置
WO2017043020A1 (en) * 2015-09-11 2017-03-16 Canon Kabushiki Kaisha Image heating device and heater for use in image heating device
EP3495893A1 (en) * 2017-12-08 2019-06-12 Ricoh Company, Ltd. Heating device, fixing device, and image forming apparatus

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JPH02309382A (ja) * 1989-05-25 1990-12-25 Ricoh Co Ltd 加熱定着装置の制御装置
JP2006039143A (ja) * 2004-07-26 2006-02-09 Canon Inc 画像形成装置およびその制御方法
JP2009145386A (ja) * 2007-12-11 2009-07-02 Canon Inc 画像形成装置
JP5966378B2 (ja) * 2012-01-23 2016-08-10 株式会社リコー 定着装置及び画像形成装置
JP2014016603A (ja) 2012-06-11 2014-01-30 Canon Inc 画像加熱装置及びベルト交換方法
JP6198580B2 (ja) * 2013-11-18 2017-09-20 キヤノン株式会社 像加熱装置及びこの像加熱装置を搭載する画像形成装置
JP2016139003A (ja) 2015-01-27 2016-08-04 キヤノン株式会社 像加熱装置
JP7302167B2 (ja) * 2017-12-26 2023-07-04 株式会社リコー 加熱装置、定着装置及び画像形成装置

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001242740A (ja) * 2000-02-28 2001-09-07 Canon Inc 定着装置及びこの定着装置を備える画像形成装置
US20090245900A1 (en) * 2008-03-31 2009-10-01 Toshiaki Kagawa Fixing apparatus and image forming apparatus including the same
US20100303525A1 (en) * 2009-05-26 2010-12-02 Tetsunori Mitsuoka Fixing device and image forming apparatus including fixing device
EP2711778A2 (en) * 2012-09-19 2014-03-26 Canon Kabushiki Kaisha Heater and image heating device mounted with heater
JP2015194713A (ja) 2014-03-19 2015-11-05 キヤノン株式会社 像加熱装置及び像加熱装置に用いるヒータ
JP2016018127A (ja) 2014-07-09 2016-02-01 キヤノン株式会社 画像加熱装置
WO2017043020A1 (en) * 2015-09-11 2017-03-16 Canon Kabushiki Kaisha Image heating device and heater for use in image heating device
EP3495893A1 (en) * 2017-12-08 2019-06-12 Ricoh Company, Ltd. Heating device, fixing device, and image forming apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4009111A1 (en) * 2020-12-01 2022-06-08 Ricoh Company, Ltd. Fixing device and image forming apparatus
US11662678B2 (en) 2020-12-01 2023-05-30 Ricoh Company, Ltd. Fixing device with controlled heating and image forming apparatus
CN116802567A (zh) * 2021-01-28 2023-09-22 信越聚合物株式会社 定影垫

Also Published As

Publication number Publication date
EP4339709A2 (en) 2024-03-20
JP2019117377A (ja) 2019-07-18
EP4339709A3 (en) 2024-05-29
JP7569023B2 (ja) 2024-10-17
JP7302167B2 (ja) 2023-07-04
JP2023085496A (ja) 2023-06-20

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