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Heater for forming base plate with thermal resistance and image heating apparatus using the same heater

A technology for heating devices and heaters, which is applied in the direction of electric heating devices, ohmic resistance heating, roller heating devices, etc., and can solve the problems of uncontrollable heater costs and expensive palladium

Inactive Publication Date: 2006-08-30
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, palladium is expensive, and if the content of palladium is increased, the cost of the heater cannot be controlled

Method used

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  • Heater for forming base plate with thermal resistance and image heating apparatus using the same heater
  • Heater for forming base plate with thermal resistance and image heating apparatus using the same heater
  • Heater for forming base plate with thermal resistance and image heating apparatus using the same heater

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment

[0035] The heating device in this embodiment is an image heating device of a pressure roller driving method and a film heating method using a fixing film (hereinafter also referred to as a fixing belt or a flexible roller) as a heating element.

[0036] figure 1 It is a vertical cross-sectional view showing a schematic configuration of a laser printer (hereinafter referred to as an image forming device) equipped with the image heating device of the present invention.

[0037] 1) Brief structure of the imaging device as a whole

[0038]This laser beam printer includes a drum-shaped electrophotographic photoreceptor (hereinafter referred to as a “photosensitive drum”) 1 as an image carrier. The photosensitive drum 1 is rotatably supported by the apparatus main body M, and is driven to rotate in the direction of the arrow R1 at a predetermined processing speed by a driving device (not shown).

[0039] Around the photosensitive drum 1, a charging roller (charging device) 2, an ...

no. 2 Embodiment

[0070] In the above-mentioned first embodiment, the heating value is the same at the upstream and downstream of the heater substrate 20a in the recording material conveyance direction, but in this embodiment, as Figure 7A and Figure 7B As shown, by changing the resistance value of the heating resistor, the heating value of the upstream and downstream is changed, and the heating distribution of the heating resistor is optimized.

[0071] exist Figure 7A , connect all the heating resistors in series, assuming that from the upstream side, the resistance values ​​of each heating resistor are R1, R2, R3, R4, R5, R6, in Figure 7B Among them, they are R1, R2, R3, and R4, and the resistance value becomes smaller from the upstream side to the downstream side (the heating resistor becomes thicker as it goes downstream). That is, whether in Figure 7A still in Figure 7B Among them, all are (resistance value of upstream) > (resistance value of downstream). For example, in Figu...

no. 3 Embodiment

[0085] like Figure 11A or Figure 11B As shown, the feature of this embodiment is: use one to form the forward path (upstream) heating resistor (the heating resistor connected to the power supply electrode 20d is one), and only the return path (downstream) heating resistor The heat generating resistors are spaced apart in the longitudinal direction (a plurality of heat generating resistors are connected in parallel to the power supply electrode 20e). One of its purposes is to prevent damage to the heater at a specific location and leakage of electricity even when the temperature detection element for safety measures does not work, thereby preventing malfunction of the computer communicating with it or electric shock to the user due to the leakage. In such a runaway state, the thermal stress on the substrate deforms the substrate so as to protrude toward the upstream side, thereby cutting off the upstream heating resistor and stopping the energization.

[0086] However, if t...

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PUM

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Abstract

A heater, or an image heating apparatus including the heater includes a substrate, heat generating resistors formed at least in a cycle path on the substrate, and current supply electrodes provided at electrical ends of the heat generating resistors, wherein plural heat generating resistors are connected in parallel to at least one of the current supply electrodes. Thus there can be obtained a heater having excellent heat generating characteristics even in a compact dimension and an image heating apparatus utilizing such heater.

Description

technical field [0001] The present invention relates to a heater suitable for use in a heating and fixing device mounted on an image forming device such as a printer or a copier using an electrophotographic or electrostatic recording recording method, and an image heating device using the heater. A heater of a substrate having a thermal resistance that reciprocates at least once, and an image heating device using the heater. Background technique [0002] An example of use as a heating device of a conventional image heating device (fixing device) provided in an image forming device such as a copier and a printer for heating and fixing a toner image on a recording material will be described below. [0003] As a fixing device in an imaging device, a heating roller type heating device is widely used. The fixing device will be processed by an appropriate image forming processing mechanism such as electrophotographic processing, electrostatic recording processing, and magnetic rec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/20H05B3/00H05B3/10H05B3/20
CPCH05B3/0095G03G15/2053
Inventor 加藤明友行洋二中园祐辅小川贤一榊原启之
Owner CANON KK
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