JPH1174061A - Heating device and picture forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating device and a picture forming device wherein temperature control trouble due to ribs is obviated and satisfactory heating treatment can be accomplished by properly positioning the ribs and a temperature sensing element. SOLUTION: This heating device has a heating body 3, a temperature sensing element 6 of the heating body 3, a film 2 which moves with a heated member, and a guide member for guiding the film 2, and heats the heated material by heat generated by the heating body 3. In this case, ribs 11 are formed on the guide member which decrease the area of the contacting surfaces between the film 2 and the guide member so that the ribs 11 and the temperature sensing element 6 may not overlap along a direction perpendicular to the travel of the film 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method in which a material to be heated is brought into close contact with a heated body via a film, and the material to be heated is moved together with the film so that the heat of the heated body is transferred through the heat-resistant film. To a film heating type heating device.

[0002] The present invention also relates to an image forming apparatus provided with the heating device as an image heating device.

[0003]

2. Description of the Related Art A heating apparatus of the above-described film heating type is disclosed in, for example, JP-A-63-313182, JP-A-2-15778, JP-A-4-44075, and JP-A-4-204980. Etc.,
In image forming apparatuses such as copiers, laser beam printers, facsimile machines, micro film reader printers, image display (display) devices, and recorders, heat and melt by appropriate image forming process means such as electrophotography, electrostatic recording, and magnetic recording. Formed on the surface of a recording material (electrofax sheet, electrostatic recording sheet, transfer material sheet, printing paper, etc.) as an image support using a toner composed of a conductive resin or the like by a direct method or an indirect (transfer) method The present invention can be used as an image heating stationary apparatus that heats and fixes an unfixed toner image (developing agent image) corresponding to target image information as a permanently fixed image on a surface of a recording material carrying the image.

In addition to the fixing device, it is widely used as a means or a device for heating a material to be heated, such as a device for heating a recording material carrying an image to improve the surface properties, a device for temporarily attaching the material, and the like. it can.

[0005] Heating devices of the film heating type include other known heating roller type, hot plate type, belt heating type, etc.
In comparison with a heating device such as a flash heating system or an open heating system or an image heating and fixing device,. A linear heating element with a low heat capacity can be used as the heating element, and a film having a low heat capacity of a thin film can be used as the film, so that it is possible to save power and shorten the wait time (improve the quick start property), The temperature can be kept low. The image heating / fixing apparatus is effective because it can prevent offset since the fixing point and the separation point can be set separately, and can solve various disadvantages of other system apparatuses.

FIG. 7 (a) is a cross-sectional model diagram of an example of a film heating type heating device (image heating device), and FIG. 7 (b) is a plan model diagram in which a heating element is omitted in the middle and partially cut away. The apparatus of this example is disclosed in JP-A-4-44075-44083,
This is a so-called tensionless type film heating type heating device disclosed in Japanese Patent No. -204980-204984, etc., wherein a cylindrical endless film is used as a heat-resistant film, and at least a part of the circumferential length of the film is always tension-free ( This is an apparatus in which tension is not applied) and the film is rotationally driven by the rotational driving force of a pressure roller as a pressure rotating member.

Reference numeral 10 denotes a holder for thermally insulating and supporting the heating element 3, which also serves as a guide member on the inner surface of the film and a stay (hereinafter referred to as a stay) as a reinforcing member of the apparatus.

The heating element 3 is a horizontally long linear heating element having a low heat capacity. The heating element 3 is fitted into a groove 10a provided along the length of the outer lower surface of the stay 10 and is adhered and fixedly supported. The heating element 3 quickly rises in temperature by the power supply to the energizing heating resistor 4 being heated by the energizing heating resistor 4 generating heat over its entire length, and the temperature increase is detected by the temperature detecting element 6 and a control (not shown) is performed. The current is fed back to the system, and when the image is heated, the power supply to the heating resistor 4 is controlled so that the temperature of the temperature detecting element 6 is maintained at a predetermined set temperature.

Reference numeral 2 denotes a cylindrical heat-resistant film externally fitted to the stay 10 including the heating element 3 and loosely externally attached to the stay 10 including the heating element 3 with a margin in the circumferential length.

Reference numeral 7 denotes a means for restricting the shift of the film.
It is a flange member that receives film ends disposed at both left and right ends of the stay 10.

Reference numeral 8 denotes a pressing roller as a pressing rotator for forming a pressure contact nip portion (fixing nip portion) N with the film 2 interposed between the heating member 3 and rotating the film 2; A shaft 8a and a heat-resistant rubber layer 8b of silicon rubber or the like having good releasability are formed. The film 2 is sandwiched with a predetermined pressing force by a bearing means and an urging means (not shown), and is brought into pressure contact with the surface of the heating element 3. It is arranged. And driving means M
As a result, the rotational driving force is transmitted via a power transmission system (not shown), and the motor is rotated in the counterclockwise direction as indicated by the arrow.

A rotational force acts on the film 2 by a frictional force between the roller and the outer surface of the film due to the rotational drive of the pressure roller 8 (when the recording material P is introduced into the pressure contact nip N, the heated material The rotational force acts indirectly on the film 2 via P), and the film 2 is rotationally driven in the clockwise direction a as indicated by the arrow while sliding on the surface of the heating body 3 by pressing. The stay 10, which also serves as a film inner surface guide member, facilitates the rotation of the film 2.

The leading end of the recording material P supporting an unfixed visible image (toner image) T to be image-fixed is pressed based on pressing of a copy button of a copying machine such as a copying machine or a print command signal. Based on a signal detected by a sensor (not shown) disposed on the front side of the apparatus, the pressure roller 8
Is started, and the heating of the heating element 3 is started.

In a state where the rotation peripheral speed of the film 2 due to the rotation of the pressure roller 8 is stabilized and the temperature of the heating body 3 rises to a predetermined value, the coating between the film 2 of the fixing nip N and the pressure roller 8 is performed. The recording material P on which an image is to be fixed as a heating material is introduced, and the fixing nip N is conveyed together with the film 2 so that the heat of the heating element 3 is applied to the recording material P via the film 2 and the recording material P is heated. The unfixed developer image T on the recording material P is heated and fixed on the surface of the recording material P. The recording material P having passed through the fixing nip N is separated from the surface of the film 2 and transported.

Such a tensionless type film heating type apparatus has a fixing nip portion N when the film is driven to rotate, and a contact portion between the film and a stay outer surface portion upstream of the fixing nip portion N in the film rotation direction. The tension acts only on the film part of the area, and the tension does not act on most of the remaining film parts. Therefore, the shifting force of the film 2 along the stay length in the film rotation driving state is small, and the shifting control means or the shifting control means for the film can be simplified. For example, the means for restricting the shift of the film can be a simple one such as the flange member 7 for receiving the end of the film, and the control means for the shift of the film can be omitted to reduce the cost and size of the apparatus.

A stay, which is a film guide member, is provided with a plurality of ribs 11 to reduce the contact area between the film 2 and the stay 10, thereby reducing the frictional resistance between the film 2 and the stay 10, and rotating the film 2. Stabilizes driving.

[0017]

In the above prior art, no special consideration was given to the positional relationship between the ribs of the stay and the temperature detecting element. Therefore, the ribs and the thermistor were arranged to overlap in the longitudinal direction of the heating device. There was something. FIG.
The positional relationship between the stay and the heating element in the longitudinal direction of the stay is shown in FIG. In the figure, the hatched portion is the outer peripheral surface 1 of the heating body 10.
The ribs 11 project outward from 0b.

In the film heating apparatus, since the heat capacity of the film 2 is extremely small, the temperature of the film 2 at the portion in contact with the stay 10 is strongly affected by the stay 10. That is, a temperature difference occurs in the film 2 between a position corresponding to a portion having the rib 11 and a position corresponding to a portion having no rib 11, and the temperature is lower than the others at a position corresponding to the portion having the rib 11. I have.

Further, at a position corresponding to a certain portion of the rib 11, the friction between the film 2 and the stay 10 is larger than at other positions, so that the amount of friction on the inner surface of the film is larger than at other positions.
In other words, when the inner surface of the film 2 is a mirror surface, the surface properties of the position corresponding to the portion having the rib 11 on the inner surface of the film become rougher as it is used. Since the adhesion between the film 2 and the heating element 3 is deteriorated in such a roughened portion, the heat of the heating element 3 is hardly transmitted to the film 2, and the temperature of the heating element 3 is accordingly reduced to other parts. And the temperature of the film 2 will be even lower than at the beginning of use of the device.

If the thermistor 6 is disposed in such a position so as to overlap, the temperature of the heating element detected by the thermistor 6 is affected by the rib 11. This is not a problem in the early stage of use of the apparatus, but becomes a problem when the position corresponding to the ribs on the inner surface of the film has been shaved due to long-term use.

That is, as for the surface temperature of the heating element 3, temperature unevenness occurs such that each rib 11 has a temperature peak. At this time, if the thermistor 6 is located at this position, even if the temperature of the thermistor 6 is controlled at the same temperature as in the initial stage of use of the apparatus, the temperature of the other portion is actually reduced with the peak corresponding to the rib actually. Temperature unevenness occurs, the total amount of heat generated by the heating element 3 becomes considerably small, and a fixing failure occurs at a position other than the position corresponding to the rib.

Therefore, in the present invention, by appropriately setting the arrangement of the rib and the temperature detecting element, the problem of the temperature control caused by the rib is eliminated, and the heating apparatus and the image forming apparatus capable of performing a good heat treatment are provided. The purpose is to provide.

[0023]

According to the present invention, there is provided a heating apparatus and an image forming apparatus having the following constitutions. [1]: A heating element, a temperature detecting element of the heating element, a film moving together with the material to be heated, and a guide member for guiding the film, and the material to be heated is heated by heat from the heating element. In the heating device, the guide member has a rib on the guide member to reduce a contact area between the film and the guide member, so that the rib and the temperature detection element do not overlap with each other in a direction perpendicular to a direction in which the film moves. A heating device characterized by being arranged.

[2] The heating device according to [1], wherein the temperature detecting element is for controlling temperature.

[3] The heating device according to [1], wherein the temperature detecting element is for safety measures in case of a device failure.

[4] The heating device according to [1], [2] or [3], wherein the material to be heated is a recording medium carrying a developer image.

[5] In the heating device of [1], [2], [3] or [4], the material to be heated is a recording medium carrying an unfixed developer image, and the recording medium is heated. And heating the developer image onto a recording medium.

[6]: An image forming apparatus comprising: an image forming means for forming and carrying a developer image on a recording medium; and an image heating means for heat-treating the recording medium carrying the developer image. An image forming apparatus comprising the heating device according to any one of [1] to [5] as an image heating unit.

<Operation> By arranging the rib and the temperature detecting element so as not to overlap in the direction perpendicular to the film moving direction, a temperature drop of the film at a portion in contact with the rib and abrasion at a position corresponding to the rib on the inner surface of the film. Even if there is a decrease in heat transfer, it does not affect the temperature detection of the temperature detecting element, so that good heat treatment can be performed without causing excessive or insufficient heating due to the ribs.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a cross-sectional view of a heating device showing an embodiment of the present invention, FIG. 2 is a perspective model view of a stay which is a film guide member of the heating device showing the embodiment of the present invention, and FIG. FIG. 4 is a diagram illustrating a relationship in arrangement of a heating body in a longitudinal direction.

Numeral 10 denotes a holder for thermally insulating and supporting a heating element 3 to be described later. The holder 10 is a substantially semicircular trough-shaped horizontally elongated member whose cross section is upward, and a guide member on the inner surface of the film and a stay as a reinforcing member of the apparatus (hereinafter referred to as stay Described).

The heating element 3 is a horizontally long linear heating element having a low heat capacity. The heating element 3 is fitted into a groove 10a provided along the length of the outer lower surface of the stay 10 and is adhered and fixedly supported.

Reference numeral 2 denotes a cylindrical heat-resistant film which is fitted on the stay 10 including the heating element 3. The inner peripheral length of the cylindrical heat-resistant film 2 and the outer peripheral length of the stay 10 including the heating element 3 are larger than that of the film 2 by, for example, about 3 mm. On the other hand, the circumference is loosely fitted with a margin.

7 is a means for restricting the shift of the film.
It is a flange member that receives film ends disposed at both left and right ends of the stay 10.

Reference numeral 8 denotes a pressing roller as a pressing rotator for forming a press contact nip portion (fixing nip portion) N between the heating member 3 and the film 2 and driving the film 2 to rotate. A shaft 8a and a heat-resistant rubber layer 8b of silicon rubber or the like having good releasability are formed. The film 2 is sandwiched with a predetermined pressing force by a bearing means and an urging means (not shown), and is brought into pressure contact with the surface of the heating element 3. It is arranged. And driving means M
As a result, the rotational driving force is transmitted via a power transmission system (not shown), and the motor is rotated in the counterclockwise direction as indicated by the arrow.

A rotational force acts on the film 2 by the frictional force between the outer surface of the roller and the outer surface of the film due to the rotational drive of the pressure roller 8 (when the recording material P is introduced into the press-contact nip N, the heated material is heated). The rotational force acts indirectly on the film 2 via the material P), and the film 2 is rotationally driven in the clockwise direction a as shown by the arrow while sliding on the surface of the heater 3 by pressing. The stay 10, which also serves as a film inner surface guide member, facilitates the rotation of the film 2. In order to reduce the sliding resistance between the inner surface of the film 2 and the surface of the heating element 3, a small amount of a lubricant such as heat-resistant grease is preferably interposed between the two.

The stay 10 is made of PPS (polyphenylene sulfide), PAI (polyamide imide), PI (polyimide), PEEK (polyether ether ketone),
It can be composed of a high heat-resistant resin such as a liquid crystal polymer, or a composite material of such a resin and ceramics, metal, glass or the like.

The heating element 3 is an elongated heat-resistant, insulating and high-heat-conductive heater substrate 1 having a longitudinal direction perpendicular to the transport direction a of the heat-resistant film 2 or the recording material P as the material to be heated. The heating resistor 4 formed along the length of the substrate at the center in the short side of the front side of the substrate, the power supply electrodes 41 at both ends of the heating resistor, and the heating resistor are formed. A linear heating element (ceramic) having a low heat capacity, including a heat-resistant overcoat layer 5 for protecting the surface of the heating element and a temperature detecting element 6 such as a thermistor for detecting the temperature of the heating element provided on the back side of the substrate. Heater).

The heating element 3 is fixedly disposed on the lower surface of the heat-resistant and heat-insulating stay 10 as described above, with the surface on which the current-generating heat-generating resistor 4 is formed being exposed downward.

The heater substrate 1 is made of, for example, alumina or aluminum nitride having a thickness of 1 mm, a width of 10 mm, and a length of 24 mm.
It is a 0 mm ceramic or the like.

The heating resistor 4 is made of, for example, Ag / Pd
(Silver palladium), an electric resistance material such as RuO ₂ , Ta ₂ N, etc., by screen printing or the like, about 10 μm in thickness and 1 to 1 in width.
It is formed by coating in a 3 mm linear or narrow band shape.

The power supply electrodes 41 are screen printing pattern layers made of Ag or the like. The overcoat layer 5 is, for example, a heat-resistant glass layer having a thickness of about 10 μm.

The heating element 3 quickly rises in temperature by the power supply to the electrodes 41 at both ends of the current-generating heat-generating resistor 4 and the heat-generating resistor 4 generates heat over the entire length thereof, and the temperature is increased by the temperature detecting element. 6 and is fed back to a control system (not shown).
Is controlled to keep the temperature at a predetermined set temperature.

The film 2 has a film thickness of 100 to reduce the heat capacity and improve the quick start property.
A heat-resistant, mold-releasing, strength-durable, flexible single-layer or multi-layer film having a thickness of at most 20 μm, preferably at most 60 μm, can be used. For example, PTFE, P
It is a single layer film such as FA or FEP, or a composite layer film in which the outer peripheral surface of a film such as polyimide, polyamide imide, PEEK, PES or PPS is coated with PTFE, PFA, FEP or the like.

The unfixed visible image to be fixed is transferred to the image heating device based on pressing of a copy button of a copying machine such as a copying machine or a print command signal or from an image forming means (not shown). (Toner image) Based on a signal when the leading end of the recording material P supporting the toner T is detected by a sensor (not shown) disposed on the front side of the apparatus, the pressure roller 8
Is started, and the heating of the heating element 3 is started.

In a state where the rotation peripheral speed of the film 2 due to the rotation of the pressure roller 8 is stabilized and the temperature of the heating element 3 rises to a predetermined value, the film is fixed between the film 2 of the fixing nip N and the pressure roller 8. The recording material P on which an image is to be fixed as a heating material is introduced, and is nipped and conveyed together with the film 2, so that the heat of the heating body 3 is applied to the recording material P via the film 2 and the recording material P The unfixed developer image T is heated and fixed on the surface of the recording material P. The recording material P having passed through the fixing nip N is separated from the surface of the film 2 and transported.

In this embodiment, as shown in FIG. 3, the rib 11 and the thermistor 6 are intentionally arranged so as not to overlap in the longitudinal positional relationship of the device.

Therefore, according to the present embodiment, even if the rib 11 takes away the heat of the film 2 and lowers the temperature of the heating element 3 at the position corresponding to the rib, the detected temperature of the thermistor 6 is not affected. Excessive fixing at positions other than the position can be prevented. In addition, even if the temperature of the heating element 3 at the position corresponding to the ribs increases, the thermistor 6 may be used even if the temperature of the position corresponding to the ribs of the heating element 3 increases.
Does not affect the detected temperature, it is possible to prevent the occurrence of overall defective fixing at positions other than the rib-equivalent position, which becomes a problem during long-term use.

<Embodiment 2> FIG. 4 is a cross sectional view of a heating apparatus according to this embodiment. In this embodiment, the same components as those in Embodiment 1 shown in FIGS. 1 to 3 are denoted by the same reference numerals, and the description thereof will not be repeated.

In the heating device of this embodiment, a temperature fuse 9 as a temperature detecting element for safety measures at the time of abnormal heating of the heating element 3 is brought into contact with the back surface of the heating element 3 to prevent failure of a temperature control circuit (not shown). When the heating element 3 generates abnormal heat, the power supply to the heating element 4 is cut off. By arranging the temperature detecting element for safety measures as described above, the safety of the device can be further enhanced.

In this case, if the ribs 11 of the stay 10 and the thermal fuses 9 are arranged so as to overlap in the longitudinal direction, the following problem occurs.

In the film heating device, since the heat capacity of the film 2 is extremely small, the temperature of the film 2 is strongly affected by the rib 11 in the portion of the stay 10 which is in contact with the rib 11, and the portion having the rib 11 and the rib 11 A temperature difference occurs in the film 2 at a position corresponding to the portion having no rib, and the temperature becomes lower than the others at a position corresponding to the portion having the rib 11. Also,
At the rib-equivalent position, the abrasion of the film 2 due to the rubbing between the film 2 and the stay 10 is larger than that of the other parts, and the surface property becomes rough after long-term use. As described above, it is difficult for the heat of the heating element 3 to be transmitted to the film 2 and the fixing property is deteriorated.

Incidentally, since the thermal fuse 9 has a large heat capacity, even if it is arranged normally, a temperature drop occurs in that portion, and the fixing property is deteriorated. For this reason, the arrangement of the thermal fuse 9 reduces the width of the heating element 4 and increases the resistance value, thereby increasing the amount of heat generated at that portion and compensating for the heat deprived by the thermal fuse 9. However, since the amount of contraction of the heating element 4 varies, it is difficult to make the temperature exactly the same as other parts of the heating element 3. In addition, since the temperature of the thermal fuse 9 rises during continuous printing, the amount of heat required at the narrowed portion changes from the initial stage of printing, which tends to cause excessive heating.

If the rib 11 overlaps the region where such a thermal fuse 9 is arranged, the thermally unstable thermal fuse portion 9 is further deprived of heat by the rib 11, so that
It becomes extremely difficult to control the fixing property.

For example, although the fixing was poor at the beginning of printing, problems such as high-temperature offset due to excessive heating are likely to occur in continuous printing. Further, since the position corresponding to the rib on the inner surface of the film becomes rough due to long-term use of the apparatus, in this case, the control of the fixing property becomes more unstable.

Therefore, in this embodiment, as shown in FIG.
The thermistor 6 is arranged so as not to overlap with the rib 11, and at the same time, the thermal fuse 9 is also arranged so as not to overlap with the rib 11 in a longitudinal positional relationship.

According to the present embodiment, the ribs 11 and the thermistor 6 are arranged so as not to overlap in the longitudinal positional relationship of the apparatus. While preventing the occurrence of
In this positional relationship, the rib 11 and the thermal fuse 9 are intentionally arranged so as not to overlap with each other, so that abnormal heat generation can be accurately detected, and the power supply to the heat generating element 4 can be cut off properly. Prevention of excessive fixing failure caused by heat stripping by the fuse 9 and heat stripping by the rib 11 or excessive fixing caused by increasing the calorific value of the temperature fuse section to compensate for the fixing fault. can do.

Further, it is possible to prevent abrasion at a position corresponding to the rib on the inner surface of the film due to long-term use of the apparatus and a fixing failure caused by overlapping the thermal fuse arrangement portion.

<Example of Image Forming Apparatus> FIG. 6 is a schematic structural view of an example of the image forming apparatus. The image forming apparatus of this embodiment is a copying machine or a printer using a transfer type electrophotographic process.

Reference numeral 21 denotes a rotating drum type electrophotographic photosensitive member, which is rotated at a predetermined process speed (peripheral speed) in a clockwise direction indicated by an arrow.

Reference numeral 22 denotes a contact charging roller as a photosensitive member charging means. A predetermined charging bias is applied. The charging roller 22 uniformly charges the surface of the rotating photosensitive member 21 to a predetermined polarity and potential. You.

An unillustrated exposure means (a slit image exposure means for an original image,
Exposure of the target image information is performed by a light beam L from a laser beam scanning exposure unit or the like, and an electrostatic latent image corresponding to the target image information is formed on the surface of the rotating photoconductor 21.

The latent image is developed by the toner developing device 24 as a toner image.

The toner image is transferred to a predetermined transfer nip portion between the rotating photosensitive member 21 and the transfer roller 25 in contact with the rotating photosensitive member 21 by a transfer bias applied between the rotating photosensitive member and the transfer roller. The image is transferred onto the transfer material P as the recording material conveyed at the timing.

The transfer material P that has passed through the transfer section and has received the transfer of the toner image is separated from the surface of the rotating photoreceptor 21 and, for example,
The sheet is conveyed and introduced into the above-described film heating type heating device R as the image heating and fixing device, undergoes heat fixing processing of the unfixed toner image, and is output as a copy or a print.

After the transfer of the toner image to the transfer material P, the surface of the rotary photoreceptor 21 is cleaned by the cleaning device 26 to remove the remaining deposits such as untransferred toner, and is repeatedly used for image formation.

<Others> In the above embodiment, the example of the heat fixing device is described. However, the heating device of the present invention is not limited thereto. For example, a device that heats a transfer material carrying an image to improve surface properties (such as gloss), It can be widely used as a so-called image heating device such as a device for temporarily attaching, or a device for feeding and drying and laminating a sheet.

[0068] The heating device of the present invention is not limited to the above-described tensionless, even if the endless film is a device configured to be rotationally driven by being stretched around a driving roller or a tension roller and a heating body, The same applies if the ribs of the guide member for guiding the film and the temperature detecting element are arranged so as not to overlap in the direction perpendicular to the film rotation direction.

[0069] In the above embodiment, an example is shown in which a heating element having a heating element formed on the heated material side (lower surface side) is used.
The present invention is not limited to this, and a backside heating type heating element in which a heating element is formed on the opposite side (upper side) of the material to be heated may be used.

In particular, the backside heating type heating element, a temperature detecting element of the heating element, a metal film moving together with the material to be heated, and a guide member for guiding the film are provided. Also in a heating device that performs temperature detection by making contact with the film on the downstream side of the heating element in the film movement direction, the rib of the guide member and the temperature detection element are arranged so as not to overlap in the direction orthogonal to the film rotation direction. Then, the same effect as in the above embodiment can be obtained.

[0071]

As described above, by appropriately setting the arrangement of the ribs and the temperature detecting element, the problem of the temperature control caused by the ribs is eliminated, and the heating apparatus and the image forming apparatus capable of performing a good heat treatment are provided. An apparatus can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a heating device according to a first embodiment.

FIG. 2 is a lower perspective model view of a stay according to the first embodiment.

FIG. 3 is an explanatory diagram of a positional relationship between a rib and a thermistor according to the first embodiment.

FIG. 4 is a schematic cross-sectional view of a heating device according to a second embodiment.

FIG. 5 is an explanatory diagram of a positional relationship between a rib and a thermistor according to a second embodiment.

FIG. 6 is a schematic configuration diagram of an image forming apparatus.

FIG. 7 is a diagram illustrating the configuration of a conventional example.

FIG. 8 is an explanatory diagram of a positional relationship between a rib and a thermistor of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heater board 2 Heat resistant film 3 Heating element 4 Electric heating resistor 5 Overcoat layer 6 Temperature control element for temperature control 7 Film end regulating flange member 8 Pressure roller 9 Temperature detection element for safety measures 10 Stay 11 Rib

Claims (6)

[Claims] 1. A heating member, a temperature detecting element of the heating member, a film moving together with the material to be heated, and a guide member for guiding the film, wherein the material to be heated is heated by heat from the heating member. In the heating device, a rib for reducing a contact area between the film and the guide member is provided on the guide member so that the rib and the temperature detecting element do not overlap in a direction orthogonal to a moving direction of the film. A heating device, wherein the heating device is disposed in the heating device. 2. The heating apparatus according to claim 1, wherein said temperature detecting element is for performing temperature control. 3. The heating device according to claim 1, wherein said temperature detecting element is for safety measures in the event of a device failure. 4. The heating device according to claim 1, wherein the material to be heated is a recording medium carrying a developer image. 5. The heating device according to claim 1, wherein the material to be heated is a recording medium carrying an unfixed developer image, and the recording medium is heated to form the developer image. A heating device characterized by heat fixing on a recording medium. 6. An image forming apparatus comprising: an image forming means for forming and carrying a developer image on a recording medium; and an image heating means for heat-treating the recording medium carrying the developer image. An image forming apparatus comprising the heating device according to any one of claims 1 to 5 as a unit.