JP2001100556A - Image heating device and image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image heating device and an image forming device capable of realizing power saving by the improvement of heat efficiency by making the width of a nip and the width of a resistance heating element larger while leaving the heat capacity of the device itself as it is without making the entire device larger, or capable of realizing power saving by the improvement of the heat efficiency by making the entire device smaller so that the heat capacity of the device itself may be lowered while leaving the width of the nip and the width of the resistance heating element as they are. SOLUTION: This image heating device is provided with a film, a heating body using ceramic as base material, a heating body holding member holding the heating body, and a pressure rotating body forming the nip with the heating body through the film, and recording paper on which an image is carried is held and fed by the nip, and the image on the recording paper is heated by the heat from the heating body through the film. At least part of ridge lines on the downstream side and the upstream side of the recording paper feeding direction of the heating body is included in the nip area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image heating apparatus and an image forming apparatus, and more particularly, to a fixing apparatus of an image forming apparatus using an electrophotographic process, such as a copying machine, a laser printer, and a facsimile.

[0002]

2. Description of the Related Art In a conventional image forming apparatus using electrophotography, for example, a uniformly charged photosensitive drum surface is scanned and exposed with a laser beam from a laser exposure device to form an electrostatic latent image based on a target image. Is formed, and toner is selectively adhered to an exposed portion of the electrostatic latent image to develop the latent image, thereby visualizing the latent image as a toner image. In synchronization with the formation of the toner image, recording paper (recording medium such as transfer material, electrostatic recording paper, electro-fax paper, printing paper, etc.) is fed one by one, and the photosensitive drum and the transfer roller ( The toner image is conveyed into a transfer section, a transfer bias is applied thereto, and the toner image is attracted and transferred onto a recording sheet. Then, the recording paper on which the toner image has been transferred (formed) is heated and pressed by a fixing device (image heating means), and
After the toner image is permanently fixed on the recording paper, the toner image is discharged out of the apparatus and the image forming operation is completed.

As a fixing device used in such an image forming apparatus, for example, a heating element is formed by providing a pattern of a resistance heating element on a ceramic substrate disclosed in Japanese Patent Application Laid-Open No. 63-313182. A film heating method is used in which the heat is generated, and the object to be heated which is brought into pressure contact with the heating body via a thin film is heated.

[0004] However, in such a film heating system, if the wound film is driven by a driving roller, a large biasing force may be generated on the film. As a countermeasure against this, Japanese Patent Laid-Open No. 04-44057
Japanese Patent Application Laid-Open No. 04-44077 discloses a configuration in which an endless film is externally fitted to a support member with a margin, and the film is driven to rotate by driving a pressure roller having a heating nip formed by pressing against an outer peripheral surface thereof, A system in which the biasing force of the film is reduced and the driving torque is reduced has been disclosed and put into practical use.

FIG. 6 shows an example of a sectional view of such a film fixing device. In FIG. 6, a heating element 102 has a resistance heating element 102a formed on a ceramic substrate, on which a glass layer 102b is coated as a protective layer. A thermistor 107 is mounted on the back surface of the heating element, and detects the temperature of the heating element 102. The resistance heating element 102a is heated by being supplied with power from a power supply (not shown), so that the temperature of the thermistor 107 becomes constant.
The amount of power supplied is controlled by driving the triac (gate-controlled semiconductor switch) by the PU.
The fixing film 101 is a cylindrical heat-resistant film having a three-layer structure. The innermost layer is the base layer, which is responsible for mechanical properties such as torsional strength and smoothness of the fixing film, and is made of polyimide, polyamideimide, PEEK, PE
It is made of a resin such as S or PPS. The next layer is a conductive primer layer, in which conductive particles such as carbon black are dispersed, and also serves as an adhesive for bonding the third layer and the base layer. The outermost layer is a top layer, and is designed to have an optimum resistance value and film thickness so as not to cause various image defects. Reference numeral 103 denotes a heating element holding member that supports the heating element 102,
It is molded from a heat-resistant resin such as a liquid crystal polymer, and also has a role as a guide member for promoting smooth rotation of the fixing film 101. Reference numeral 106 denotes a fixing stay, which is made of metal such as iron or aluminum. The fixing stay 106 plays a role of suppressing deformation of the heating element holding member 103 due to creep and increasing rigidity of the heating element holding member 103. Reference numeral 104 denotes a pressure roller, which is a metal core 1 made of aluminum, cast iron, or the like.
04a is a heat-resistant elastic body 10 such as silicon rubber.
4b. The surface layer of the pressure roller is provided with a coating of a fluororesin such as PFA, PTFE, FEP or the like having a releasing property from the toner.

The pressure roller 104 is pressed against the heater 102 with the fixing film 101 interposed therebetween, and forms a fixing nip N at the pressed portion. Core 104a of pressure roller 104
Is driven to rotate, and the fixing film 101 is driven to rotate at the fixing nip. The recording material P carrying the toner is conveyed by a transfer roller and a photosensitive drum (not shown) and guided to a fixing nip by a fixing entrance guide 105. The toner T on the recording village is pressed and heated on the recording material at the fixing nip, and the toner resin is softened and adheres to the recording material to be permanently fixed.

FIGS. 7A and 7B are views showing the nip portion of the fixing device, in which FIG. 7A is a cross-sectional view, and FIG. is there. FIG.
In (b), the hatched area A indicates the area of the resistance heating element,
An alternate long and short dash line B indicates a nip region with the pressure roller 104. The reason why all the resistance heating element areas are included in the nip area is to prevent heat generated outside the nip area from being transmitted to the recording paper, thereby reducing thermal efficiency.
It is a general configuration that the entire nip region is included in the surface of the heating element.

In such a film heating type fixing device, a heater having a low heat capacity can be used, so that a shorter wait time (quick start) can be achieved as compared with the conventional heat roller type. Further, by enabling quick start, preheating during non-printing operation is not required, and overall power saving can be achieved.

[0009]

However, even in an electrophotographic printer having a film heating type fixing device, more than half of the power consumption is consumed by the fixing device, and the amount of power consumption is a problem. For this reason, there is a demand for power saving by further improving the thermal efficiency in a film heating type fixing device.

Conventionally, the first effective means for improving the thermal efficiency in a fixing device is to increase the pressing force to increase the nip width (C in FIG. 6) and widen the pressure and heating area. . However, if the width of the heating element and the size of the heating element holding member are increased along with the increase in the nip width, the entire heat fixing device becomes large, and at the same time, the heat capacity of the device itself increases, thereby improving the thermal efficiency. Will be spoiled.

A second effective means for improving the thermal efficiency is to increase the width of the resistance heating element (D in FIG. 6) in the heating body to increase the heating area.

However, it goes without saying that if the heating element goes out of the nip range, the heat will not be transmitted to the recording paper. Therefore, if the nip width is increased with the increase in the resistance heating element, and the width of the heating element and the size of the heating element holding member are further increased, the entire heating and fixing apparatus becomes large, and at the same time, the heat capacity of the apparatus itself increases. As described above, the improvement effect of the above is impaired.

Accordingly, the present invention is to increase the nip width or the resistance heating element width without changing the heat capacity of the device itself as it is, without increasing the size of the device as a whole, thereby achieving power saving by improving thermal efficiency, or It is an object of the present invention to reduce the heat capacity of the device itself by reducing the overall size of the device and to reduce power consumption by improving thermal efficiency while keeping the resistance heating element width unchanged.

[0014]

An image heating apparatus and an image forming apparatus according to the present invention have the following features to solve the above-mentioned problems.

[1]: a heating element, a film that is in sliding contact with the heating element, a heating element holding member that holds the heating element, and a pressure rotating body that forms a nip with the heating element via the film. An image heating apparatus for nipping and conveying a recording sheet carrying an image in the nip, and heating an image on the recording sheet by heat from the heating element via the film, wherein the heating is performed in the nip area. An image heating apparatus, wherein at least a part of a ridge line on a downstream side and an upstream side in a recording paper conveyance direction of a body is included.

[2] The image heating apparatus according to [1], wherein the entire area of the resistance heating element is included in the nip area.

[3]: A part of the ridge line on the downstream side of the heating element in the recording material conveyance direction is included in the nip area, and the entire area of the ridge line on the upstream side of the heating element in the recording material conveyance direction is included. The image heating device according to [1] or [2], wherein there is no image heating device.

[4]: a heating element, a film that is in sliding contact with the heating element, a heating element holding member that holds the heating element, and a pressing rotator that forms a nip with the heating element via the film. An image heating apparatus for nipping and conveying a recording sheet carrying an image in the nip, and heating an image on the recording sheet by heat from the heating element via the film, wherein the heating is performed in the nip area. An image heating apparatus, wherein at least a part of the ridges on the downstream side and the upstream side in the recording paper conveyance direction of the body are included, and the ridges have no burrs or protrusions harmful to the film.

[5] The image heating apparatus according to [4], wherein the entire area of the resistance heating element is included in the nip area.

[6]: A part of the ridge line on the downstream side of the heating element in the recording material conveyance direction is included in the nip area, and the entire area of the ridge line on the upstream side of the heating element in the recording material conveyance direction is included. The image heating device according to [4] or [5], wherein the image heating device is not provided.

[7] The image heating apparatus according to any one of [1] to [6], wherein the heating element has a resistance heating element and a conductive pattern on at least one surface of the substrate. apparatus.

[8]: The heating element forms a plurality of sets of resistance heating elements and conductive patterns on a single base material, and the resistive heating elements and the conductive patterns are divided into pairs and the downstream side in the recording paper conveyance direction of the base material. The image heating apparatus according to any one of [1] to [7], wherein at least a part of the ridge line on the upstream side is wrapped.

[0023]

[9]: The heating element according to any one of [1] to [6], wherein the heating element has a base made of a magnetic substance that generates heat by generating an induced current by the action of a magnetic flux by an exciting unit. Image heating equipment.

[10]: The pressure rotating body is a pressure roller, both ends of which are rotatably supported by a pressure roller support member, and the recording paper can be conveyed in one direction by rotating in one direction. Characterized by [1] to

[9]
The image heating apparatus according to any one of claims 1 to 4.

[11] The image heating apparatus according to any one of [1] to [10], wherein the image is fixed on the recording material by heating.

[12]: In an image forming apparatus having an image forming means for forming an image on a recording material and an image heating means for heating the image on the recording material, [1] to [ [11] An image forming apparatus comprising the image heating device according to any one of [11] to [11].

<Operation> In the heat fixing apparatus of the present invention, at least one of the ridges on the downstream side and the upstream side in the recording paper transport direction is included in the nip area among the ridges in the longitudinal direction of the heating element. By doing so, without increasing the size of the entire heating and fixing device including a heating element and a heating element holding member,
It is possible to save power by increasing the nip width and the resistance heating element width while improving the thermal efficiency while keeping the heat capacity of the device itself as it is. In addition, if this function is used in reverse, even if the current nip width and the resistance heating element width are used, the entire heating and fixing device including the heating element and the heating element holding member can be downsized to reduce the heat capacity of the apparatus itself. This also makes it possible to save power by improving thermal efficiency.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS <First Embodiment> FIG. 1 is a view of a heat fixing device according to a first embodiment of the present invention.
(A) is sectional drawing, (b) is the figure which looked at the surface of the heating body from the illustrated V direction. In FIG. 1, 1 is a heat-resistant film,
Reference numeral 2 denotes a heating element, and a resistance heating element 2a is formed on the lower surface of the ceramic substrate 2b. Reference numeral 3 denotes a heating element holding member that holds the heating element 2, and the film 1 is externally fitted while holding the heating element 2. Reference numeral 4 denotes a pressure roller that presses against the heating body 2 with the film 1 interposed therebetween and forms a nip N. Arrows a1, a2, and a3 in the figure indicate the rotation direction of the film 1, the rotation direction of the pressure roller 4, and the conveyance direction of the recording paper P, respectively, and the hatched portion A indicates the area of the resistance heating element 2a. A chain line B indicates a nip region with the pressure roller 4.

When the pressure roller 4 is driven to rotate in the direction of arrow a2, the film 1 is driven to rotate in the direction of arrow a1, and the temperature of the heater 2 is controlled to a predetermined fixing temperature. The recording paper P carrying the toner image T is introduced into the N, and while being conveyed by the rotation of the pressure roller 4, the recording paper P is pressed between the film 1 and the pressure roller 4, and the heating element via the film 1 is heated. The toner image T is fixed on the recording paper P by being heated by the heat from the second sheet.

As shown in the figure, in the heat fixing device of the present embodiment, the area of the resistance heating element (illustration A in the figure) is provided in the nip area (illustration B) formed by the pressing of the pressure roller 4. ) And the ridge line on the downstream side of the resistance heating element in the recording paper transport direction (the angle between the surface on the recording paper side and the side surface on the downstream side, shown in C) and the ridge line on the upstream side (the surface on the recording paper side and the upstream side) , And a part of D) shown in FIG.

In the conventional example, the portion not included in the nip was widened in the heating element, so that heat escaped from that portion. In the present embodiment, however, the nip region formed by the pressure contact of the pressure roller 4 Since the heating element 2 includes a part of the ridge line on the upstream side and part of the ridge line on the downstream side in the recording paper conveyance direction, since a wider area of the heating element 2 is included in the nip, heat that escapes is reduced, and the heating element 2, the efficiency transmitted to the recording paper is improved as compared with the conventional example. Thus, the temperature rise of the heating element 2 can be accelerated even with the same input power. If the temperature rise of the heating element 2 is accelerated, the target temperature is quickly reached, so that the power can be quickly reduced and the energy consumption can be suppressed. Also, when the set temperature is maintained, for example, during paper passing, the amount of heat escaping to the support member 3 is reduced, so that the energy consumption during normal use can be reduced. With the above effects, it is possible to provide a fixing device in which the preheating time is short and the power consumption is small.

Further, in the present embodiment, the heating efficiency is improved by increasing the nip width while keeping the heating element width unchanged, but conversely, the heating element 2 is maintained with the nip width remaining unchanged. The thermal efficiency may be improved by narrowing the width of the heating element so as to include a part of the ridge line on the upstream side and part of the ridge line on the downstream side in the recording paper conveyance direction and reducing the heat capacity.

As shown in FIG. 2, the heating element 2 is provided on a single ceramic plate 20 for several heating elements.
a, the conductive pattern 2c, and the glass protective layer 2d are sequentially printed and fired, and are divided into one line by the dividing line 21 to be manufactured.
For the division, there are a method using a diamond cutter, a method for laser cutting, a method for making a hole serving as a perforation and shearing along the hole, and in any case, the end face of the divided substrate 2b has a burr. And harmful projections are likely to be present.

As described above, in the present embodiment, unlike the conventional example, since a part of the ridgeline of the heating element is included in the nip region, a large pressure is generated between the heat-resistant film and the edge of the heating element. Therefore, in order to include both the ridge lines of the heating element 2 in the nip, the nip is cut by a method such as high-energy density laser cutting that does not generate burrs or harmful protrusions on the end face, or the burrs after cutting. It is necessary to carry out a process for removing harmful projections or a heat-resistant film such as a high-rigidity metal film which is not damaged by burrs or harmful projections.

The most reliable and effective means is to remove the burrs and harmful protrusions after cutting, and wrap the edges (ridges) of the heating element 2 with wrapping paper or the like. By doing so, it is possible to remove burrs.

In this embodiment, since the heat-resistant film 1 having a thickness of 30 μm to 50 μm is used,
Burrs having a height from the substrate surface of 10 μm or more were defined as harmful, and were reduced to less than this by lapping. The harmful burrs may be defined so as not to damage the film when a paper passing durability test for the number of sheets (for example, 200,000 sheets) specified by the product life is performed.

In this embodiment, an example has been described in which both the ridge line on the downstream side and the ridge line on the upstream side are included in the nip. However, even when one of the ridge lines is included in the nip, the effect similar to that of this embodiment is obtained. is there. In the present embodiment, the example of the heating element in which the resistance heating element is formed on the lower surface of the substrate 2b has been described. However, the heating element in which the resistance heating element is formed on the upper surface of the substrate 2b (the surface opposite to the film sliding contact surface) is used. The same effect can be obtained.

<Second Embodiment> FIGS. 3A and 3B are views of a heating device according to a second embodiment of the present invention, wherein FIG. 3A is a sectional view, and FIG. FIG. In FIG. 3, 1 is a heat-resistant film, 2 is a heating body,
2a is a resistance heating element formed on the lower surface of the heating element, 3 is a heating element holding member, and 4 is a pressure roller. The arrows in the figure indicate the rotation directions of the film 1 and the pressure roller 4 and the recording paper P.
The hatched portion A indicates the area of the resistance heating element 2 a, and the dashed line B indicates the nip area with the pressure roller 4.

As shown in FIG. 3B, the heating device according to the present embodiment includes a resistance heating element area (a heating element) in a nip area (illustrated B) formed by pressing the pressure roller 4. A) and a part of the ridge line (shown C) on the downstream side of the resistance heating element in the recording paper transport direction is included, and the entirety of the ridge line (shown D) on the upstream side of the heating element in the recording paper transport direction is included. The range is not included.

The base member 2b of the heating element 2 is manufactured by dividing a large plate from which several base members 2b can be removed, as in the above embodiment. For the division, there are a method using a diamond cutter, a method for laser cutting, a method for making a hole to be perforated and shearing along the hole. In any case, the end face is shown in FIG. It is highly possible that burrs and harmful protrusions as in d) exist. Therefore, in order to include both the downstream ridge line and the upstream ridge line in the nip as in the first embodiment, cut or cut in such a manner that no burr or harmful protrusion is generated on the end face. As mentioned above, it is necessary to carry out processing to remove those burrs and harmful protrusions later, or to use a heat-resistant film that will not be damaged by burrs and harmful protrusions. It was a factor that limited the construction method and specifications. In the present embodiment, the reason that only the ridge line on the downstream side is put in the nip and the ridge line on the upstream side is not put in the nip is that the film 1 is not damaged even if burrs or harmful projections exist on the end face. In order not to enter the nip, the upstream side where the film 1 is conveyed in the direction facing the burr from the tip of the burr toward the base, the burr is tilted from the base of the burr toward the tip. The downstream side where the film 1 is conveyed is placed in the nip.

In the prior art, the portion of the heating element not included in the nip was widened, so that heat escaped from that portion. In the present embodiment, however, the nip region formed by the pressure contact of the pressure roller 4 Since a part of the ridgeline on the downstream side of the heating element 2 in the recording paper transport direction is included, and a wider area of the heating element 2 is included in the nip, the heat that escapes is reduced and the heating element generates heat. Can be improved as compared with the conventional example. In particular, the improvement of the heating efficiency becomes possible without limiting the method and specifications as in the first embodiment. Thus, the temperature rise of the heating element can be accelerated even with the same input power. If the temperature rise of the heating element is accelerated, the target temperature is quickly reached, so that the power can be quickly reduced and the energy consumption can be suppressed.
Also, when the set temperature is maintained, such as during paper passing, the amount of heat escaping to the support member is reduced, so that the energy consumption during normal use can be reduced. With the above effects, it is possible to provide a fixing device in which the preheating time is short and the power consumption is small.

In this embodiment, an example of a heating element having a resistance heating element formed on the lower surface has been described. However, it is needless to say that a heating element having a resistance heating element formed on the upper surface has the same effect.

<Example of Image Forming Apparatus> FIG. 4 is a schematic structural view of a laser beam printer which is an image forming apparatus of the present invention. In the figure, 201 is a photosensitive drum, 202 is a charging roller, 203 is a laser exposure device, 204 is a reflection mirror, 205 is a developing sleeve, 206 is toner, 207 is a toner container, 208 is a transfer roller, and P is a recording medium. Recording paper, 210 is a cleaning blade, 211
Is a waste toner container, 212 is a fixing device, 213 is a paper cassette, 214 is a paper feed roller, 215 is a separation pad,
216 is a high voltage power supply.

The photosensitive drum 201 rotates in the direction of the arrow,
It is uniformly charged by the charging device 202 supplied with power from the high voltage power supply 216. The laser light emitted from the laser exposure device 203 is reflected by the reflection mirror 204 and irradiated on the photosensitive drum to form an electrostatic latent image on the photosensitive drum.

The toner container 207 is filled with the toner 206, and after the developing sleeve 205 rotates, an appropriate amount of toner is appropriately charged and supplied to the photosensitive drum. The toner 206 on the developing sleeve adheres to the electrostatic latent image on the photosensitive drum 201, and the latent image is developed and visualized as a toner image. The paper feed roller 214 feeds the recording medium (recording paper) P one sheet at a time from the paper cassette 213. The separation pad 215 is arranged in contact with the paper feed roller, and its surface friction coefficient, ground contact angle, and shape are adjusted so that only one recording medium is fed per paper feed. The visualized toner image on the photosensitive drum is transferred onto the recording medium by the transfer roller 208. The transfer residual toner remaining on the photosensitive drum without being transferred is stored in a waste toner container by the cleaning blade 210, and the photosensitive drum 201 whose surface is cleaned.
Repeatedly enters the next image forming process. The recording medium P on which the toner image is placed is heated and pressed by the fixing device 212 described in the first or second embodiment, and the toner image is permanently fixed on the paper.

According to the apparatus of this embodiment, it is possible to reduce the power required for fixing and save power without increasing the size of the apparatus.

<Others> In the above embodiments, the case where ceramic is used as the base material of the heating body is shown, but other materials such as metal and glass may be used.

For example, as shown in FIG. 5, an image heating apparatus of an electromagnetic induction heating system using a metal base may be used.
The configuration other than the heating element is the same as that of the above-described embodiment, and the description is omitted by assigning the same reference numerals and the like.

In the figure, reference numeral 20 denotes a base made of a conductive ferromagnetic metal, and reference numeral 30 denotes an exciting means for applying a magnetic flux to the base, and includes a coil 13, a core 14, and the like. Reference numeral 11 denotes a heating element holding member, which holds the base member 20 and the exciting means 30 which are the heating elements of the present example.

Thus, an induced current is generated in the substrate 20 by the magnetic flux from the exciting means 30, and the substrate 20 is heated by Joule heat. At the same time, the pressure roller 4 is driven at a predetermined process speed, the film 1 is driven to rotate, and when the recording paper P carrying the toner image T is passed through the nip N, the heat from the heating body is reduced. The toner image T is fixed on the recording paper P by the nip pressure.

Also in the present apparatus, the same effects as in the above embodiment can be obtained by arranging the ridge line of the base member 20 of the heating element in the nip portion N as described above.

[0052]

As described above, according to the present invention, without increasing the size of the entire apparatus, the heat capacity of the apparatus itself can be increased without increasing the nip width or the resistance heating element width, and power can be saved by improving thermal efficiency. Or an image heating apparatus and an image forming apparatus capable of reducing the heat capacity of the apparatus itself by reducing the overall size of the apparatus and keeping the nip width and the resistance heating element width as they are, thereby achieving power saving by improving thermal efficiency. An apparatus can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a heat fixing device according to a first embodiment of the present invention.

FIG. 2 is an explanatory view of a heating element used in the fixing device of FIG.

FIG. 3 is a schematic configuration diagram of a heat fixing device according to a second embodiment of the present invention.

FIG. 4 is a schematic diagram of an image forming apparatus of the present invention.

FIG. 5 is a diagram showing another configuration example of the image heating apparatus according to the present invention.

FIG. 6 is a diagram for explaining a conventional heat fixing device.

FIG. 7 is an explanatory view of a nip portion of a conventional heat fixing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Film 2 Heating body (heater) 3 Support member 4 Pressure roller 201 Photosensitive drum 202 Charging device 203 Laser exposure device 204 Reflection mirror 205 Developing sleeve 206 Toner 207 Toner container 208 Transfer roller 210 Cleaning blade 212 Fixing device 213 Paper cassette 214 Feeding Paper roller 215 Separation pad N Nip P Recording medium (recording paper) T Toner image

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takeshi Nakagawa 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Yusuke Nakazono 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon (72) Inventor Satoru Taniguchi 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Noriyuki Ito 3-30-2, Shimomaruko, Ota-ku, Tokyo Canon Inc. F Terms (reference) 2H033 AA21 AA30 AA32 BA25 BA27 BB33 BE03 3K058 AA81 AA87 AA95 CE04 CE21 DA04 GA06

Claims (12)

[Claims] 1. A heating element, a film that slides on the heating element, a heating element holding member that holds the heating element, and a pressure rotating body that forms a nip with the heating element via the film. An image heating apparatus for nipping and transporting a recording sheet carrying an image in the nip and heating an image on the recording sheet by heat from the heating element through the film, wherein the heating element is disposed in the nip area. An image heating apparatus, wherein at least a part of a ridge line on a downstream side and an upstream side in a recording paper conveying direction is included. 2. The image heating apparatus according to claim 1, wherein the entire area of the resistance heating element is included in the nip area. 3. The nip area includes a part of the ridge line of the heating element on the downstream side in the recording material conveyance direction, and does not cover the entire area of the ridge line on the upstream side of the heating element in the recording material conveyance direction. The image heating device according to claim 1, wherein: 4. A heating element, a film slidably contacting the heating element, a heating element holding member for holding the heating element, and a pressurizing rotating element forming a nip with the heating element via the film. An image heating apparatus for nipping and transporting a recording sheet carrying an image in the nip and heating an image on the recording sheet by heat from the heating element through the film, wherein the heating element is disposed in the nip area. An image heating apparatus, wherein at least a part of the ridge lines on the downstream side and the upstream side in the recording paper conveyance direction are included, and the ridge lines have no burrs or protrusions harmful to the film. 5. The image heating apparatus according to claim 4, wherein the entire area of the resistance heating element is included in the nip area. 6. The nip area includes a part of a ridge line on the downstream side of the heating body in the recording material conveyance direction, and does not cover an entire area of the ridge line on the upstream side of the heating body in the recording material conveyance direction. The image heating apparatus according to claim 4, wherein: 7. The image heating apparatus according to claim 1, wherein the heating element has a resistance heating element and a conductive pattern on at least one surface of a substrate made of ceramic. apparatus. 8. The heating element forms a plurality of sets of resistance heating elements and a conductive pattern on one base material, and divides the sets into a pair of base materials divided downstream and upstream in the recording paper transport direction. The image heating apparatus according to any one of claims 1 to 7, wherein at least a part of the ridge line is wrapped. 9. The heating element according to claim 1, wherein the heating element has a base made of a magnetic substance that generates an induced current by the action of a magnetic flux generated by an exciting unit and generates heat. Image heating device. 10. The pressure rotating body is a pressure roller, both ends of which are rotatably supported by a pressure roller support member, and can rotate one direction to convey a recording sheet in one direction. The image heating apparatus according to claim 1, wherein: 11. The image heating apparatus according to claim 1, wherein the image is fixed on the recording material by heating the image. 12. An image forming apparatus having an image forming means for forming an image on a recording material and an image heating means for heating the image on the recording material, wherein the image heating means is used as the image heating means. An image forming apparatus comprising the image heating device according to claim 1.