JPH11282302A - Fuser - Google Patents

Abstract

(57) Abstract: A fixing device provided with a heating roller for fixing in which a heating element sheet is disposed on an inner or outer peripheral surface of a roller body. To facilitate the work of arranging them so that they adhere to the surface. A heating element sheet provided on a heating roller is provided.
The pattern 5 has a meandering pattern as a heat-generating portion 5e in which a large number of strip-shaped portions 5c extending obliquely to the circumferential direction are folded. That is, in the heating element sheet 7, since the belt-like portions 5c of the pattern 5 are arranged obliquely to the circumferential direction, the rigidity of the heating element sheet 7 in the circumferential direction is small and uniform. For this reason, it is very easy to round the heating element sheet 7 along the inner peripheral surface of the cylindrical roller body, and when it is rounded, it becomes substantially columnar. Therefore, the work of arranging the heating element sheet 7 so as to be in close contact with the inner peripheral surface of the roller body can be performed very easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in an image forming apparatus for forming an image by attaching a recording material to a recording medium such as paper, and fixing the recording material adhered to the recording medium. About.

[0002]

2. Description of the Related Art Conventionally, there has been known an image forming apparatus provided with an image forming means for forming an image by adhering a recording material such as toner or ink to a recording medium such as paper or film.
Many of these types of image forming apparatuses include a fixing device that fixes a recording material adhered to a recording medium by the image forming unit. As this type of fixing device, a fixing heating roller for heating a recording material adhered to a recording medium,
There is a fixing roller provided with a pressing roller for pressing the recording medium on the outer peripheral surface of the fixing heating roller. In the fixing device configured as described above, the recording medium after image formation is conveyed while being sandwiched between the fixing heating roller and the pressing roller, and the recording material is heated and pressed together with the recording medium, and the recording material is recorded. It can be fixed on a medium.

[0003] The configuration of the fixing heat roller is as follows.
Conventionally, there has been considered a configuration in which a halogen lamp is built in, and the heat generated by the halogen lamp is conducted to the roller surface to raise the temperature of the entire fixing heating roller. However, since the halogen lamp of such a heating roller for fixing is usually disposed near the rotation axis of the roller, the heat efficiency is poor, and the surface of the heating roller for fixing is fixed after the energization of the halogen lamp is started. It took a long time to raise the temperature to a suitable temperature.

Therefore, in recent years, various studies have been made on the heat roller for fixing in order to increase the thermal efficiency and the temperature rising speed. For example, it has been considered that the roller body is formed in a cylindrical shape and an insulating film material having a pattern of a resistance heating element formed on the inner surface side is provided along the inner peripheral surface thereof. In this case, the roller body is often made of a metal having good thermal conductivity, but the pattern and the roller body are insulated from each other by an insulating film material. Therefore, when the pattern is energized to generate heat, heat is conducted from the vicinity of the inner peripheral surface of the roller body, and the thermal efficiency and the temperature rising rate can be improved satisfactorily.

[0005]

However, the insulating film material on which the pattern of the resistance heating element is formed (hereinafter, the whole is referred to as a heating element sheet) is disposed in close contact with the inner peripheral surface of the roller body. The work required skill as follows.

For example, in the heating element sheet illustrated in FIG. 5A, a resistance heating element pattern 95 made of stainless steel (SUS) or the like is formed on the inner surface side of the insulating film material 97 as follows. . That is, power supply portions 95a and 95b for supplying electric power are formed at both ends in the long side direction (axial direction of the roller body) of the insulating film material 97, and the power supply portions 95a and 95b are provided.
b, a heating portion 95e is formed as a meandering pattern formed by connecting a large number of strip portions 95c extending in the axial direction and a folded portion 95d formed between adjacent ends of each strip portion 95c. ing. If the heating element sheet is arranged along the inner peripheral surface of the roller body and power is supplied between the power supply sections 95a and 95b, the heating section 95e generates heat, and the temperature of the fixing heating roller is efficiently and quickly raised. Can be done.

In this case, it is relatively easy to roll the heating element sheet along the inner peripheral surface of the roller body, but it is difficult to bend at a portion where the belt-like portion 95c exists and at a portion where it does not exist. It becomes difficult. That is,
The rigidity of the heating element sheet in the circumferential direction becomes non-uniform, resulting in a polygonal pillar shape when rounded (see FIG. 6). For this reason,
If the skill of the worker is insufficient, a part of the belt-like portion 95c may rise from the inner peripheral surface of the roller body, and the part may not be able to radiate heat to the roller body and may be overheated.

Conversely, as shown in FIG. 5B, when a large number of belt-like portions 95c are formed in the circumferential direction, it becomes difficult to round the heating element sheet. That is, the rigidity in the circumferential direction is made uniform, but the rigidity is increased as a whole.
For this reason, if the skill of the worker is insufficient, an extra force is applied when the heating element sheet is rolled, and the pattern 95 may be damaged (for example, a fold or a scratch). Also, when a heating element sheet is provided on the outer peripheral surface of the roller body, the same problem occurs even if any of the heating element sheets shown in FIGS. 5A and 5B is used.

In view of the above, the present invention is directed to a fixing device provided with a fixing heating roller in which a heating element sheet is disposed on the inner or outer peripheral surface of a roller body. The purpose is to facilitate the work of arranging them so as to be in close contact with the surface.

[0010]

Means for Solving the Problems and Effects of the Invention According to the first aspect of the present invention, there is provided a fixing heating roller for heating a recording material adhered to a recording medium;
A pressing roller for pressing the recording medium on the outer peripheral surface of the fixing heating roller, wherein the recording medium is transported while being sandwiched between the fixing heating roller and the pressing roller, and the recording material adheres to the recording medium. A fixing device, wherein the heating roller for fixing heats a roller body formed in a cylindrical shape and an insulating film material disposed along an inner peripheral surface of the roller body to generate heat in accordance with energization. A heating element sheet formed with a pattern of a resistance heating element to be formed, and the pattern of the resistance heating element has a meandering pattern in which a plurality of belt-like portions extending obliquely to the circumferential direction of the roller body are folded back. Features.

According to the present invention, the pattern of the resistance heating element of the heating element sheet provided on the fixing heating roller is a meandering pattern in which a plurality of belt-like portions extending obliquely to the circumferential direction of the roller body are folded. Have. That is, in the present invention, since the belt-like portions of the pattern are arranged obliquely with respect to the circumferential direction, the circumferential rigidity of the heating element sheet is small and uniform. For this reason, it is easy to round the heating element sheet along the inner peripheral surface of the roller body, and when it is rounded, it becomes substantially cylindrical.

Therefore, according to the present invention, the work of arranging the heating element sheet so as to be in close contact with the inner peripheral surface of the roller body can be performed very easily. Therefore, it is possible to favorably prevent a part of the heating element sheet from rising from the inner peripheral surface and being overheated or damaging a band-shaped portion or the like when the heating element sheet is rolled.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, an elastic material is further filled in the heating element sheet disposed along the inner peripheral surface of the roller body. Features. According to the present invention, since the heating element sheet disposed along the inner peripheral surface of the roller body is further filled with an elastic material, the heating element sheet adheres better to the inner peripheral surface of the roller body. I do. Therefore, claim 1
In addition to the effects of the invention described above, it is possible to more effectively prevent a part of the heating element sheet from being lifted up and overheated, and to further improve the thermal efficiency and the rate of temperature rise of the heating roller for fixing. Occurs.

According to a third aspect of the present invention, there is provided a fixing heating roller for heating a recording material adhered to a recording medium, and a pressing roller for pressing the recording medium on an outer peripheral surface of the fixing heating roller. A fixing device for fixing the recording material adhered to the recording medium by transporting the recording medium while sandwiching the recording medium between the fixing heating roller and the pressing roller, wherein the fixing heating roller is formed in a cylindrical shape. A roller body; and a heating element sheet formed by forming a pattern of a resistance heating element that generates heat in accordance with energization on an insulating film material disposed along the outer peripheral surface of the roller body. The body pattern has a meandering pattern in which a plurality of belt-like portions extending obliquely to the circumferential direction of the roller main body are folded back.

According to the present invention having the above-described structure, the circumferential rigidity of the heating element sheet is small and uniform, as in the first aspect. For this reason, it is easy to round the heating element sheet along the outer peripheral surface of the roller body, and when it is rounded, it becomes substantially cylindrical. Therefore, in the present invention, the work of arranging the heating element sheet so as to be in close contact with the outer peripheral surface of the roller body can be performed very easily. Therefore, it is possible to favorably prevent a part of the heating element sheet from rising from the outer peripheral surface and being overheated, or from being damaged when the heating element sheet is rolled.

In the present invention, since the heating element sheet is disposed along the outer peripheral surface of the roller body, the operation of arranging the heating element sheet is further facilitated as compared with the first aspect of the present invention. On the other hand, according to the first aspect of the present invention, since the heat generated by the heating element sheet is transmitted to the recording medium via the roller body,
The recording material adhered to the recording medium can be more uniformly heated and fixed as compared with the present invention.

According to a fourth aspect of the present invention, in addition to any one of the first to third aspects, an angle formed by the obliquely extending strip portion with respect to the circumferential direction is 45 ° or more. Features. In the present invention, the angle formed by the band portion with respect to the circumferential direction is 45 ° or more. For this reason, the circumferential rigidity of the heating element sheet becomes sufficiently small, and it is extremely easy to roll it. Therefore, according to the present invention, in addition to the effect of the invention according to any one of claims 1 to 3, it is possible to more effectively prevent damage to the belt-shaped portion and the like when the heating element sheet is rolled. Occurs.

According to a fifth aspect of the present invention, in addition to any one of the first to fourth aspects, the insulating film material includes a pair of sides arranged adjacent to each other along a central axis of the roller body. Has a substantially rectangular shape with a pair of sides disposed along the end face of the roller body, the angle formed by the strip portion with respect to the circumferential direction, the diagonal line of the insulating film material is It is characterized in that it is smaller than the angle formed with respect to the circumferential direction.

That is, in the present invention, the insulating film material is formed in a substantially rectangular shape having two pairs of sides extending in the axial direction and the circumferential direction of the roller body, and the angle formed by the strip portion with respect to the circumferential direction. Is smaller than the angle formed by the diagonal line of the insulating film material with respect to the circumferential direction. For this reason, most of the belt-shaped portions are disposed over substantially the entire circumference of the roller body, and come into contact with the roller body at least somewhere. Therefore,
According to the present invention, in addition to the effect of the invention described in any one of claims 1 to 4, an effect that a part of the heating element sheet can be more effectively prevented from being overheated.

[0020]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view illustrating a configuration of an electrophotographic printer P (corresponding to an image forming apparatus) configured using the fixing device of the present invention. This printer P is a laser printer that performs exposure using a laser. First, the configuration of the printer P will be briefly described with reference to FIG.

The printer P includes a paper feed cassette section A in which sheets as recording media are stacked, a manual paper feed section B capable of sucking sheets one by one, and a paper feed cassette section A or a manual paper feed section. A sheet conveying section C for conveying the sheet sucked from the section B, a drum-type electrophotographic photosensitive member, a charger, a developing device,
An electrophotographic process unit D (corresponding to an image forming unit), which includes a static eliminator and the like, and forms an image by attaching toner as a recording material to the conveyed paper, and modulates the charged photoconductor according to image data. A laser beam scanner S (exposure device) that scans and exposes the laser beam thus formed to form an electrostatic latent image on the photoconductor, a heating roller for fixing, a pressing roller, and the like. And a paper discharge unit F that conveys the paper on which the toner is fixed to a tray at the upper part of the main body.

FIG. 2 shows a fixing unit 5 disposed in the heat fixing unit E.
FIG. 2 is a cross-sectional view illustrating the configuration of FIG. The fixing device 51 includes a fixing heating roller (hereinafter, simply referred to as a heating roller) 1 for heating the toner attached to the sheet, and heat-resistant silicon rubber or the like provided around a metal shaft 53a. A pressing roller 53 for pressing the sheet against the outer peripheral surface, discharge rollers 55 and 57 for discharging the sheet to the outside of the apparatus, sheet guides 59 and 61 for guiding the sheet to a predetermined position, and covering the heating roller 1 and the pressing roller 53. A cover 63 and the like are provided. The heating roller 1 having the characteristic configuration of the present invention supplies heat for fixing the toner to the sheet in the fixing device 51, and discharge rollers 55 and 57 with the sheet sandwiched between the heating roller 1 and the pressing roller 53. It also plays the role of transporting in the direction.

Next, the heating roller 1 will be described in detail. FIG. 3 is a cross-sectional view illustrating a configuration in which the fixing device 51 is cut along the rotation axis of the heating roller 1. This heating roller 1
Has a hollow cylindrical roller body 3 made of aluminum, and a heating element sheet 7 provided with a resistance heating element pattern 5 that generates heat in accordance with energization on an inner peripheral surface of the roller body 3, A sponge tube 9 made of a silicon sponge as a material is sequentially arranged.
A pair of bearings 11 is fitted and fixed to the outer peripheral surface of the roller body 3 near both ends, and a spur gear 13 is fitted and fixed to one outer side.

Here, the pair of bearings 11 are made conductive by dispersing carbon in PPS (polyphenylene sulfide) having excellent heat resistance.
Is rotatably supported by a heat-resistant resin frame 67 together with the metal shaft 53a. The roller body 3 is grounded via the bearing 11, and the pressing roller 53 is grounded via the metal shaft 53a. For this reason, it is possible to prevent the charged toner and the like from adhering to the heating roller 1 or the pressing roller 53 and also to prevent the occurrence of noise and the like.

A rotational force is transmitted to the spur gear 13 from a drive system (not shown), whereby the roller body 3 can be rotated to convey the paper. Further, a portion of the outer peripheral surface of the roller body 3 that is in pressure contact with the pressing roller 53 is
Coating treatment with fluororesin which is excellent in heat resistance and releasability is performed.

Next, FIG. 4 is a plan view showing the structure of the heating element sheet 7. The heating element sheet 7 is provided with an insulating film material 17 formed by laminating two polyimide films having an insulation property of 3 KV withstand voltage, a stainless steel (SUS) thin film is adhered on the surface thereof, and an etching process is performed. Is applied to form the pattern 5.

As shown in FIG. 4, the insulating film material 17 is formed in a rectangular sheet shape, the longer side of which has the same length as the roller body 3, and the shorter side of which is longer than the inner circumferential length L of the roller body 3. Each has a length longer by a predetermined amount (L1 + L1).
Therefore, if the insulating film material 17 is rolled in the short side direction (hereinafter, referred to as a circumferential direction) and stored in the roller body 3, the roller body 3
Can be arranged with (L1 + L1) overlap in the circumferential direction over the entire inner peripheral surface of the inner peripheral surface.

The pattern 5 has a substantially rectangular power supply portion 5a at both ends in the long side direction (hereinafter, referred to as an axial direction) of the insulating film material 17.
5b. Each of the power supply portions 5a and 5b has a length of (L-L1 -L1) in the circumferential direction, and the power supply portion 5b on the side where the spur gear 13 is disposed in the axial direction is the power supply portion 5a.
It is formed longer. A large number of strips 5c extending obliquely at an angle of about 45 ° with respect to the axial direction are provided between the feeding parts 5a and 5b, and a folded part formed between adjacent ends of the strips 5c. A heating portion 5e is provided as a meandering pattern formed by connecting the heating portions 5d. Further, the heat generating portion 5e has, as a whole, substantially the same circumferential length as the power supply portions 5a and 5b and an axial length slightly longer than the pressure contact portion of the pressing roller 53. Further, another polyimide film 19 is adhered to the surface of the heat generating portion 5e so as to sandwich the heat generating portion 5e between the heat generating portion 5e and the power supply portions 5a and 5b.

For this reason, if the heating element sheet 7 is stored in the roller body 3 as described above, the heating section 5e extends over the entire portion facing the pressing roller 53 in the axial direction and in the roller body 3 in the circumferential direction. 3 is arranged over substantially the entire circumference. As shown in FIG. 3, since the heating element sheet 7 is housed in the roller body 3 with the pattern 5 inside, the insulation between the pattern 5 and the roller body 3 is ensured by the insulating film material 17. Further, since the resistance value of the heat generating portion 5e is much larger than the resistance values of the power supply portions 5a and 5b, the heat generating portion 5e generates heat when power is supplied between the power supply portions 5a and 5b. The heating element sheet 7 is pressed against the inner peripheral surface of the roller body 3 by the elastic force of the sponge tube 9 disposed in the roller 3 in a state of being compressed in the radial direction, and the roller body 3 also has good heat conduction. Therefore, the heat generated by the heat generating portion 5e is uniformly and satisfactorily transmitted to the paper and toner sandwiched between the pressing roller 53 and the heat generating portion 5e.

Therefore, in the heating roller 1, an alternating current is applied between the power supply sections 5a and 5b by the following configuration. FIG.
The pair of electrode holders 21 made of an insulating material are fitted to both ends of the roller body 3. This electrode holder 21
Has a flange portion 21a which engages with the edge of the roller body 3 to prevent the roller body 3 from being buried.
Fit inside. In this embodiment, since the elastic force of the sponge tube 9 is used, the insulating film material 17 is used.
Need only be rolled and inserted into the roller body 3, and the manufacturing process can be simplified. Instead of using the sponge tube 9, the adhesive may be adhered to the inner peripheral surface of the roller body 3. In this case, it is necessary to prevent air bubbles from entering between the adhesive layer and the roller body 3. The electrode holder 21 supports an electrode plate 23 made of phosphor bronze in the diameter direction of the roller main body 3, and both ends 23 a of the electrode plate 23 are bent inwardly of the roller main body 3, respectively, and are connected to the power supply section 5 a or 5 b. In contact. In addition, both ends 23a of each power supply plate 23 are in contact with positions of the power supply portions 5a or 5b which are displaced from each other by 180 °.

The outer end face of each power supply plate 23 is exposed to the outside of the electrode holder 21, and a columnar silver electrode 71 abuts near the center thereof. Each silver electrode 71
Are fixed to the cover 63 via support plates 73 formed by bending a band material such as phosphor bronze into a U-shape, and an AC power supply 75 (primary voltage) is connected between the pair of support plates 73. Have been. Note that a thermostat 77 is interposed between one support plate 73 and the AC power supply 75,
Abnormal heat generation is prevented.

That is, the temperature of the heating roller 1 is adjusted to a predetermined temperature by bringing a thermistor (not shown) into contact with the outer peripheral surface of the roller body 3 and controlling the amount of electricity to the support plate 73 based on the detection signal. . However, when an abnormality occurs in the control system or the like, the temperature of the heating roller 1 may increase abnormally. Therefore, in the fixing device 51, the cover 63
A thermostat 77 is provided, and when the temperature of the heating roller 1 rises abnormally, an energization path from the AC power supply 75 to the one support plate 73 is forcibly shut off. The cover 63 is made of, for example, a resin having sufficient heat resistance, such as PET (polyethylene terephthalate).

In the fixing device 51 thus configured, the pattern 5 of the heating element sheet 7 provided on the heating roller 1 is provided.
Has a meandering pattern in which a number of band-like portions 5c extending obliquely to the circumferential direction are folded back. That is, in the heating element sheet 7, since the belt-like portions 5c of the pattern 5 are arranged obliquely to the circumferential direction, the rigidity of the heating element sheet 7 in the circumferential direction is small and uniform. Moreover, the belt-like portion 5
Since the angle formed by c with respect to the circumferential direction is 45 °, the rigidity is sufficiently reduced. Therefore, the heating element sheet 7
It is very easy to round the roller along the inner peripheral surface of the roller body 3, and when the roller is rounded, it has a substantially cylindrical shape. Therefore, in the heating roller 1, the heating element sheet 7 is
The work of arranging it so as to be in intimate contact with the inner peripheral surface thereof can be performed extremely easily. Therefore, it is possible to extremely effectively prevent the heating element sheet 7 from floating up from the inner peripheral surface and being overheated, or damaging the belt-shaped portion 5c or the like when the heating element sheet 7 is rolled. .

Further, since the heating element sheet 7 is pressed against the inner peripheral surface of the roller body 3 by the sponge tube 9, the heating element sheet 7 comes into better contact with the inner peripheral surface of the roller body 3. Further, since the angle formed by the strip portion 5c with respect to the circumferential direction is smaller than the angle formed by the diagonal line of the insulating film material 17 with respect to the circumferential direction, many of the strip portions 5c (upper left corner and lower right corner in FIG. 4) are formed. Are arranged over substantially the entire circumference of the roller body 3 and come into contact with the roller body 3 at least somewhere. Therefore, in the heating roller 1, overheating of a part of the heating element sheet 7 can be more favorably prevented. Further, since the heating element sheet 7 is pressed against the inner peripheral surface of the roller body 3 by the sponge tube 9, the thermal efficiency and the temperature rising rate of the heating roller 1 can be further improved.

It should be noted that the present invention is not limited to the above embodiment at all, and can be implemented in various forms without departing from the gist of the present invention. For example, the angle formed with respect to the circumferential direction of the band-shaped portion 5c can be variously changed. Further, the heating element sheet 7 may be provided along the outer peripheral surface of the roller body 3.

Also in this case, the circumferential rigidity of the heating element sheet 7 is small and uniform. For this reason, it is easy to round the heating element sheet 7 along the outer peripheral surface of the roller body 3, and when it is rounded, it becomes substantially columnar. Therefore,
Functions and effects similar to those of the above-described embodiment are obtained. When the heating element sheet 7 is disposed along the outer peripheral surface of the roller body 3 as described above, the operation of disposing the heating element sheet 7 is further facilitated as compared with the above-described embodiment. On the other hand, in the above-described embodiment, the heat generated by the heating element sheet 7 is conducted to the paper and the toner via the roller body 3, so that the heating and fixing can be performed more uniformly.

In the above embodiment, the insulating film material 17 is used.
Is constituted by stacking two polyimide films, but may be constituted by one polyimide film as long as the polyimide film has sufficient insulating properties. Further, in any of the above cases, the heating element sheet 7 does not necessarily need to be provided with the insulating film material 17 facing the roller body 3 side. For example, if some kind of insulating layer is provided on the inner peripheral surface or the outer peripheral surface of the roller main body 3, the pattern 5 can be disposed toward the roller main body 3 side.

Further, the present invention can be applied not only to the above-described printer P but also to various image forming apparatuses such as a copying machine and a facsimile. The present invention can be applied to other than the electrophotographic image forming apparatus, for example,
The present invention can also be applied to a hot-melt inkjet type image forming apparatus that forms an image by melting a solid ink at normal temperature and ejecting it from a recording head.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of a printer to which the present invention has been applied.

FIG. 2 is a cross-sectional view illustrating a configuration of a fixing device of the printer.

FIG. 3 is a cross-sectional view of the fixing device cut along a rotation axis of a heating roller.

FIG. 4 is a plan view illustrating a configuration of a heating element sheet of the heating roller.

FIG. 5 is a plan view illustrating a configuration of a conventional heating element sheet.

FIG. 6 is a cut end view of the heating roller showing the problem of the heating element sheet.

[Explanation of symbols]

1. Heating roller for fixing 3. Roller body
5: Pattern 5a, 5b: Feeding part 5c: Strip-shaped part
5d: folded portion 5e: heating section 7: heating element sheet
9 sponge tube 17 insulating material 23 electrode plate
51: fixing device 53: pressing roller 71: silver electrode
75: AC power supply E: Thermal fixing unit F: Paper discharge unit
P… Printer

Claims (5)

[Claims] 1. A fixing heating roller for heating a recording material adhered to a recording medium, and a pressing roller for pressing the recording medium on an outer peripheral surface of the fixing heating roller, wherein the recording medium is What is claimed is: 1. A fixing device for fixing a recording material adhered to a recording medium by being conveyed while being sandwiched between a fixing heating roller and a pressing roller, wherein the fixing heating roller is a cylindrical roller body; Insulating film material arranged along the inner peripheral surface of the main body,
A heating element sheet formed by forming a pattern of a resistance heating element that generates heat in accordance with energization; and A fixing device having a pattern. 2. The fixing device according to claim 1, wherein an elastic material is filled further inside the heating element sheet disposed along an inner peripheral surface of the roller body. 3. A fixing heating roller for heating a recording material adhered to a recording medium, and a pressing roller for pressing the recording medium on the outer peripheral surface of the fixing heating roller, wherein the recording medium is What is claimed is: 1. A fixing device for fixing a recording material adhered to a recording medium by being conveyed while being sandwiched between a fixing heating roller and a pressing roller, wherein the fixing heating roller is a cylindrical roller body; Insulating film material arranged along the outer peripheral surface of the main body,
A heating element sheet formed by forming a pattern of a resistance heating element that generates heat in accordance with energization; and A fixing device having a pattern. 4. The fixing device according to claim 1, wherein the obliquely extending strip portion forms an angle of 45 ° or more with the circumferential direction. 5. An approximately insulating material comprising: a pair of sides disposed adjacent to each other along a center axis of the roller body; and a pair of sides disposed along an end surface of the roller body. 5. A rectangular shape, wherein an angle formed by the strip portion with respect to the circumferential direction is smaller than an angle formed by a diagonal line of the insulating film material with respect to the circumferential direction.
The fixing device according to any one of the above.