JPH11251041A - Plate-like heater, fixing device and image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To resolve the trouble of a glass overcoat layer on the surface and to reduce the occurrence of defective toner fixing on copying paper by providing a glass layer formed on the surface of a substrate including a resistance heating element and a lubricating layer having a surface state different from that of the glass layer formed on the surface of the substrate. SOLUTION: A glass layer 4 is extended to the surface side 11 of a substrate 1 continued to a resistance heating element 2 including nearly the whole face of the resistance heating element 2 except for terminal sections 3 and part of the substrate 1, and it is formed by fusing glass powder of borosilic acid lead glass or the like. A lubricating layer 5 is extended to the surface side 11 of the substrate 1 continued to the glass layer 4 portion including the whole face of the glass layer 4, and it is made of molybdenum disulfide and has a cleaving property. The lubricating layer 5 covers the substrate 1 including the glass layer 4 formed on the surface of the resistance heating element 2, it has bonding force higher than that of the glass layer 4, and the peeling of the lubricating layer 5 from the substrate 1 can be surely reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate-shaped heater used for a toner fixing device or a heating device such as a drying device of OA equipment such as a copying machine, a facsimile, a computer, etc. The present invention relates to an image forming apparatus.

[0002]

2. Description of the Related Art In an electronic copying machine, for example, a recording medium such as copy paper on which a toner image is formed is passed between a heater and a pressure roller while being pressed, and the copy paper is heated by the heat of the heater. The toner is fused and fixed.

[0003] There are various types of heaters for this fixing, but due to the demand for downsizing and multi-functionality of equipment,
Some are flat. This plate-shaped heater has a long surface with a flat surface made of alumina ceramics or the like.
Silver-palladium alloy (A
g / Pd) -based thick film paste is printed and baked to form a long and thin strip-shaped resistance heating element. Both ends of the resistance heating element are widened, and a film made of a good conductor such as silver (Ag) is formed in this portion. To form a terminal portion. Further, in this heater, the surface of the resistance heating element is covered with an overcoat layer made of glass so that the resistance heating element is electrically insulated or protected from abrasion, oxidation, sulfuration, and the like.

Further, the fixing device is provided with a plate-shaped heater parallel to a pressure roller whose surface is formed of a heat-resistant elastic material, and the surface of the pressure roller has a roll-shaped fixing film made of a protective polyimide resin or the like. And rotates while slightly elastically contacting the overcoat layer of the heater. When the copy paper is supplied between the film covering the heater and the pressure roller, the rotation of the pressure roller causes
The copy sheet is conveyed while sliding along with the roll-shaped fixing film on the surface of the overcoat layer of the heater. During this time, the toner on the copy sheet is heated and melted and fixed by the heat of the heater.

In a plate heater used in such a fixing device, a surface of a resistance heating element on a flat substrate is covered with a glass overcoat layer, and a roll-shaped heater slidingly contacts the overcoat layer. The fixing film rotates smoothly, so that copying paper can be transported smoothly and good heat fixing can be performed.

In the fixing device described above, the copy sheet is supplied between the roller and the heater by the rotation of the pressure roller, but the pressure of the pressure roller and the supply of the copy sheet to which the toner is attached are supplied. Due to the timing, the frictional resistance between the fixing film and the surface of the plate heater becomes larger than the frictional resistance between the fixing film and the copy paper, especially at the time of starting the apparatus. There is a case where a problem occurs that the copy paper slides on the film and the toner cannot be properly fixed. Further, when the toner adhering surface is on the fixing film side, the toner attached is not conveyed together with the fixing film and the copy paper, so that the toner is easily accumulated on the heater where the most pressure is applied.

When the overcoat layer made of glass is formed of glass having a high melting point, it is necessary to perform the layer forming operation at a high temperature, but there is a possibility that the heating element may be oxidized. In relation to holding down low,
The surface tends to be a rough surface having many irregularities, and the friction resistance with the fixing film tends to be too large. Conversely, when formed from a glass with a low melting point, etc., the layer forming operation is easy, the unevenness on the surface is small, the smoothness is improved, and the frictional resistance is reduced, but the impurities are contained in the components a lot, so There is a problem that the electrical insulation is reduced, the resistance of the heating element is reduced, and the heater does not rise to a predetermined temperature. Further, when the surface smoothness is extremely improved, the fixing film slips and does not rotate, and the copy paper is conveyed only to the pressure roller side, which may not be performed smoothly. In addition, the glass layer was easily damaged by thermal shock (temperature change) due to turning on and off the power supply to the heating element.

[0008]

Therefore, as a means for preventing this problem, grease has been applied between the fixing film and the plate-like heater to reduce the frictional resistance. Has not yet resolved this problem. Also, it was found that the surface of the plate-shaped heater had a proper resistance, so that the contact with the fixing film was better. Although there has been a technique for forming a lubricating layer in the past, a sufficient adhesion strength between the glass layer and the lubricating layer was not always obtained due to the determination of the roughness of the glass layer surface as described above.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a plate heater capable of solving the problem of the glass overcoat layer on the surface and a fixing device and an image forming apparatus in which the occurrence of defective toner fixing on copy paper or the like is reduced.

[0010]

According to a first aspect of the present invention, there is provided a plate-shaped heater comprising: a flat substrate having heat resistance and electric insulation; and a strip formed on a surface of the substrate along a longitudinal direction. A heating element, a power supply electrode formed on the substrate and connected to the resistance heating element, a glass layer formed on the surface of the substrate including at least the resistance heating element, It is characterized by having a lubricating layer having a different surface state from the glass layer formed on the surface.

[0011] In the plate heater having the above structure, the lubricating layer protects the glass layer forming an electrical insulation function formed on the surface of the resistance heating element to prevent breakage and continuously covers the glass layer and the substrate made of ceramics. It is easy to make the surface of the substrate rougher than the glass layer, and if the surface is formed moderately rough, the bonding force is higher than the bonding with glass, and the lubrication layer can be prevented from peeling from the substrate. .

It is important that the lubricating layer is formed not only on the glass layer but also on the substrate made of ceramics, and its tip is formed so as to cover the entire surface of the substrate even on the substrate. No problem.

If the surface of the glass layer is provided with irregularities to increase the surface area and the lubricating layer is formed, the bonding area can be increased and the bonding strength between the two can be increased.

Further, for example, molybdenum disulfide (Mo) is included in a material component for forming a lubricating layer covering the upper surface of the glass layer.
In addition to the lubricant such as S ₂ ), glass of a component forming the lower glass layer may be mixed. By mixing a vitreous material into the lubricating layer in this way, it is possible to enhance the bonding property with the lower glass layer.

The plate heater of the present invention can be mounted not only in a fixing device of OA equipment such as a copying machine and a facsimile, but also in various fields of equipment such as industrial manufacturing equipment and home equipment. is there.

According to a second aspect of the present invention, there is provided a plate heater.
It is characterized in that the surface of the lubricating layer is rougher than the surface of the glass layer.

Usually, the glass layer is formed as a smooth surface with almost no irregularities by melting. For this reason, in a fixing device or the like, the fixing film passing over the glass layer slips and stagnates, and as described above, there have been problems such as the occurrence of defective toner fixation and the jamming of copy paper.

According to a third aspect of the present invention, there is provided a plate heater,
A flat substrate having heat resistance and electrical insulation, a belt-shaped resistance heating element formed on the surface of the substrate along the longitudinal direction, and a power supply formed on the substrate and connected to the resistance heating element. An electrode and a lubricating layer formed on the surface on the opposite side of the substrate where the resistance heating element is not formed.

In this plate-shaped heater, a lubricating layer made of, for example, molybdenum disulfide (MoS ₂ ) is formed on the back side of the substrate. Used when pressed against paper, film, or the like, a smaller frictional resistance than a substrate made of ceramics or the like is obtained, and smooth conveyance can be performed as in the above embodiment.

According to a fourth aspect of the present invention, in the fixing device, the plate heater according to any one of the first to third aspects, wherein a pressure roller and a lubricating layer portion are provided to face the pressure roller. When,
A fixing film movably provided between the plate heater and the pressure roller.

When the recording medium onto which the unfixed toner image has been transferred, for example, copy paper, is conveyed to the fixing device, the copy paper is moved up and down while both the pressure roller and the fixing film are rotating. It is passed so as to be fed out while being pinched from the lower surface. At that time, the unfixed toner image is printed on the copy paper by the above-described pressing and heating of the resistance heating element,
A toner image can be fixedly formed on copy paper.

At this time, since the surface of the lubricating layer formed on the uppermost layer covering the resistance heating element of the plate heater has an appropriate frictional resistance and is in sliding contact with the fixing film, the fixing film rotates smoothly. As a result, good fixing of the toner can be performed.

According to a fifth aspect of the present invention, there is provided an image forming apparatus comprising: means for attaching a toner to an electrostatic latent image formed on a medium and transferring the toner to a sheet to form a predetermined image; 5. The fixing device according to claim 4, wherein the fixing device is configured to fix the toner by passing the paper on which the image is formed by the pressure roller through the fixing film while pressing the fixing heater. .

An unfixed toner image is transferred to a recording medium such as a copy sheet or a film supplied from a cassette by an electrophotographic process in an image forming unit, and the unfixed toner image is operated in the same manner as in the above-mentioned claim 4. Is fixed by a fixing device that performs

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a plate heater according to the present invention will be described with reference to FIGS. 1 is a plan view in which an intermediate portion of the plate-shaped heater H is cut away, FIG. 2 is a bottom view of FIG. 1, and FIG. 3 is an enlarged side sectional view of a portion cut along a line XX in FIG. is there.

In FIG. 1, reference numeral 1 denotes a substrate, which is made of a heat-resistant and electrically insulating material, for example, a ceramic material such as aluminum oxide (Al ₂ O ₃ ) or aluminum nitride (AlN) having a length of about 30.
It is formed in an elongated strip shape having a size of 0 mm, a width of about 10 mm, and a thickness of 0.65 to 1 mm. Reference numeral 2 denotes a length of about 230 formed on the front side 11 of the substrate 1 along the longitudinal direction.
silver, palladium (Ag · Pd) alloy, silver (Ag), silver / platinum (Ag · P)
t) A strip-shaped resistance heating element mainly composed of an alloy or the like is formed of a silver-palladium (Ag.) having a length of about 15 mm and a width of about 6 mm formed at both ends of the resistance heating element 2.
Pd) A power supply terminal portion made of a good conductor film mainly composed of an alloy or the like.

Reference numeral 4 denotes the terminal portions 3 and 3 and the substrate 1
A glass powder such as lead borosilicate glass formed extending to the surface side 11 of the substrate 1 following the part of the resistance heating element 2 including substantially the entire surface of the resistance heating element 2 except for a part thereof is formed by melting. It is a glass layer having a thickness of 20 to 100 μm.

Numeral 5 is a lubricating material having a cleavage property, such as molybdenum disulfide (MoS ₂ ) formed to extend to the front surface 11 of the substrate 1 following the glass layer 4 including the entire surface of the glass layer 4. Layer. The lubricating layer 5 has a layer thickness of 1 to 1 formed by, for example, attaching molybdenum disulfide (MoS ₂ ) to the glass layer 4 and the substrate 1 by printing or spraying, and curing at room temperature or by heating.
At 0 μm, the surface has an appropriate roughness.

The back side 12 of the substrate 1 has the front side 1
A pair of wiring conductors of about 1 mm in width and 10 to 30 μm in thickness, which are made of a material mainly composed of a silver / palladium (Ag · Pd) alloy or the like similar to the terminal section 3 along the extending direction of the heating element 2 31 and 32 are formed in parallel, and their ends are terminal portions 33 and 34.

Then, a temperature detecting element 6 such as a thermistor having a temperature-sensitive portion facing the substrate 1 by bridging the ends of the wiring conductors 31 and 32 to form silver (Ag) or silver / palladium (A).
g · Pd) alloy powder and the like are bonded via a conductive adhesive mixed with an inorganic binder or an organic binder. Further, a protective coating layer (not shown) made of an insulating resin such as an epoxy resin or a silicone resin is formed on a surface including the thermistor 6 and the above-mentioned joint. The installation position of the temperature detecting element 6 is different from the other surface (back surface) side 1 of the substrate 1.
2 is a place where stable temperature detection is possible.

The plate heater H is provided with an SSR (Solid State Relay) or a PWM (Pulse W).
id Modulation: pulse width control method)
Etc. and connected via a temperature control circuit to the terminals 3, 3
When power is supplied during this time, a current flows through the resistance heating element 2 and the heating element 2
Exhibits a substantially uniform heat generation temperature distribution in the longitudinal direction. This heater H is formed of silver / palladium (Ag ·
Pd) becomes an electric resistance element, and the resistance value of the heating element 2 is adjusted by the ratio of silver / palladium (Ag · Pd) contained in the resistance paste. In the present embodiment, about 2
It has a resistance of 5 ohms [Ω], and a current of about 4 A flows when a voltage of 100 V is applied, resulting in a calorific value of about 400 W.

Usually, a thermistor 6 provided on the back side of the substrate 1 detects the temperature of the heater H and turns on and off the SSR and the like through a temperature control circuit to control the temperature to a predetermined temperature.

In the plate-shaped heater H having the above-described structure, the lubricating layer 5 can protect the glass layer 4 having an electrical insulating function formed on the surface of the resistance heating element 2 and can improve heat resistance.

In the plate heater H, the lubricating layer 5 continuously covers not only the glass layer portion but also the front side 11 of the substrate 1 made of a glass layer and ceramics. 4, the bonding force is higher than that of the bonding with the substrate 4, and the separation of the lubricating layer 5 from the substrate 1 can be reliably reduced. It is important that the lubricating layer 5 is formed not only on the glass layer 4 but also on the front surface 11 of the substrate 1 made of ceramics, and its tip covers the entire surface of the substrate 1 even on the substrate 1. There is no problem even if it is formed as follows.

The lubricating layer 5 formed so as to cover the upper surface of the glass layer 4 is made of, for example, molybdenum disulfide (Mo).
S ₂ ), the molybdenum disulfide (Mo)
It may be formed by mixing glass such as borosilicate glass into S ₂ ).

By mixing a vitreous material into the lubricating layer 5, the effect of increasing the bonding strength with the lower glass layer 4 and improving the durability is exhibited.

If the surface of the glass layer 4 is provided with irregularities to increase the surface area and the lubricating layer 5 is formed, the joining area can be increased and the joining strength between the two can be increased.

Next, a second embodiment of the plate heater of the present invention will be described. Note that the drawing is the same as FIG. 1 and FIG.

In the case of the second embodiment, the surface of the lubricating layer 5 formed so as to cover the upper surface of the glass layer 4 is a rough surface having more irregularities than the surface of the glass layer 4.

Usually, the surface of the glass layer 4 is formed as a smooth surface with almost no irregularities by melting. For this reason, in a fixing device or the like, there is a problem that the copy sheet passing over the glass layer 4 slips and stagnates, so that the predetermined heating of the toner cannot be performed or the copy sheet is jammed.

However, the above molybdenum disulfide (MoS
₂ ) is a crystal having a hexagonal structure, which has a layered structure having a plurality of thin flakes and having a cleavable property. When a layer is formed, a rough surface having appropriate irregularities can be formed on the surface. And, when the paper or the film pressed against the pressure roller disposed opposite to the rough surface is pressed against the rough surface, the paper or the film is sent out with appropriate frictional resistance without strong pressure. be able to.

Further, as a third embodiment of the plate heater of the present invention, the configuration shown in FIG. 4 may be adopted. FIG. 4 is an enlarged side sectional view of an intermediate portion of the plate-shaped heater H1, and FIG.
The same parts as those described above are denoted by the same reference numerals and description thereof will be omitted.

The plate-shaped heater H1 is located on the front side 1 of the substrate 1.
A glass layer 4 for protecting the resistance heating element 2 is provided on the surface of the substrate 1 including a strip-shaped resistance heating element 2 formed along the longitudinal direction of the substrate 1.
Is formed. A lubricating layer 5 made of, for example, molybdenum disulfide (MoS ₂ ) is formed on the back surface 12 of the substrate 1.

In the fixing device, the plate heater H1 having such a configuration is provided not on the side of the resistance heating element 2 but on the substrate 1
Is used when the back side of the substrate is pressed against paper, film, or the like, and a smaller frictional resistance than that of the substrate 1 made of ceramics or the like is obtained, and smooth conveyance can be performed as in the above-described embodiment.

Next, an embodiment of the fixing device F of the present invention will be described with reference to FIG. FIG. 5 is a vertical cross-sectional side view showing the internal structure of the fixing device F. In the device F, the above-mentioned plate heater H is incorporated. In FIG. 5, reference numeral F1 denotes a pressure roller, and a rotating shaft F2 which is rotatably supported by a drive unit (not shown) is protruded from both end surfaces, and a surface of a cylindrical roller body F3 formed on the outer periphery of the rotating shaft F2. Is fitted with a heat-resistant elastic material such as a silicone rubber layer F4.

F5 is a columnar heater support disposed opposite to the rotation axis F2 of the pressure roller F1. A plate heater H is arranged on the support F5 in parallel with the pressure roller F1. It is attached and fixed in the state. An endless roll-shaped fixing film F6 made of a heat-resistant sheet such as a polyimide resin is wound around the base F5 including the heater H in a freely circulating manner. The surface of the lubricating layer 5 formed on the upper side of the resistance heating element 2 is in elastic contact with the silicone rubber layer F4 of the pressure roller F1 via the fixing film F6. In FIG. 5, PA is a recording medium, for example, copy paper, T1 on the copy paper PA is a printed unfixed toner image, and T2 is a fixed toner image.

The fixing device F having the above configuration is used as a part of an image forming apparatus as described later, and fixes the unfixed toner image T1 transferred to a recording medium such as copy paper PA. In the fixing device F, the plate heater H is energized through an elastic connector (not shown) made of a phosphor bronze plate or the like in contact with the terminals 3, 3, and the resistance heating element 2 generates heat at a predetermined temperature. In this state, the pressing roller F1 is rotated by the driving unit, and the fixing film F6, which is vertically moved and pressed against the driving roller F1, slides around the surface of the lubricating layer 5 covering the resistance heating element 2 while sliding around the heater support F5. Circulate.

When the copy paper PA on which the unfixed toner image T1 has been transferred is conveyed to the fixing device F, the upper and lower surfaces of the copy paper PA have the silicone rubber layer F4 of the pressure roller F1.
While both the fixing film F6 and the fixing film F6 are rotating, the sheet is passed so as to be fed out in the direction of the arrow in the drawing while being pressed from the upper and lower surfaces. At this time, the unfixed toner image T1 is printed on the copy paper PA by the above-described pressurization and the heating of the resistance heating element 2, and the toner image T2 can be fixedly formed on the copy paper PA.

That is, on the paper input side of the pressure roller F1, the unfixed toner image T1 on the copy paper PA is first heated and melted by the heater H via the fixing film F6, and at least the surface portion thereof completely exceeds the melting point and completely melts. Softens and melts. Thereafter, on the paper discharge side of the pressure roller F1, the copy paper PA separates from the heater H, the toner image T2 naturally radiates heat, cools and solidifies again, and the fixing film F6 also forms the copy paper P.
A is separated from A.

At this time, the surface of the lubricating layer 5 formed on the uppermost layer to cover the resistance heating element 2 of the plate-shaped heater H has an appropriate frictional resistance and is in sliding contact with the fixing film F6.
The fixing film F6 is smoothly rotated, and the copy paper PA is smoothly transported together with the fixing film F6 between the fixing roller F1 and the fixing roller F1, so that good fixing with little toner bleeding can be performed.
Further, since the lubricating layer 5 is excellent in heat resistance and abrasion resistance, the life of the plate heater H can be extended.

Next, an image forming apparatus, such as a copying machine, a printer, a facsimile, etc., having the above-described plate heater H and fixing device F according to the present invention mounted thereon will be described.

FIG. 6 shows a copying machine as an embodiment of the image forming apparatus. FIG. 6 is a vertical sectional side view showing a schematic configuration of the copying machine P. In FIG. 6, the fixing device F is the same as in the above-described embodiment.

In FIG. 6, P1 is the housing of the copying machine P, P2
Is a document placing table made of a transparent member such as glass provided on the upper surface of the housing P1 and reciprocates in the direction of arrow Y to move the document PA1.
Is scanned.

An illuminating device L composed of a lamp for irradiating light and a reflecting mirror is provided above the inside of the casing P1, and the reflected light from the document PA1 illuminated by this illuminating device L is short-focal and small-diameter. The photosensitive drum P is formed by the imaging element array P3.
4 is subjected to slit exposure. The photosensitive drum P4
Rotates in the direction of the arrow.

A charger P5 uniformly charges the photosensitive drum P4 coated with, for example, a zinc oxide photosensitive layer or an organic semiconductor photosensitive layer. On the drum P4 charged by the charger P5, an electrostatic image subjected to image exposure by the imaging element array P3 is formed. This electrostatic image is visualized using a toner made of a resin or the like that softens and melts when heated by the developing device P6.

On the other hand, the copy paper PA stored in the cassette P7 is pressed against the feed roller P8 and the image on the photosensitive drum P4 in a vertical direction at a timing so as to synchronize with the image, and is rotated by a pair of transport rollers P9. Is sent onto the drum P4. The toner image formed on the photosensitive drum P4 by the transfer discharger P10 is
A is transferred to A.

Thereafter, the sheet PA separated from the drum P4
Is discharged to the tray P12 after being guided to the fixing device F by the transport guide P11 and subjected to the heat fixing process. In addition,
After the transfer of the toner image, the residual toner on the drum P4 is removed by the cleaner P13.

The fixing device F has an effective length in the direction orthogonal to the moving direction of the copy sheet PA, which is the width (length) of the maximum size sheet that can be copied by the copying machine P, that is, the width (length) of the maximum size sheet. A) The plate-shaped heater H is disposed by extending the longer resistance heating element 2 and pressurizing for feeding is performed relative to the resistance heating element 2 so as to lightly elastically contact the extending direction of the resistance heating element 2. A roller F1 is provided. And the heater H
The unfixed toner image T1 on the sheet PA sent between the sheet and the pressure roller F1 is melted by receiving heat from the resistance heating element 2 and copied onto the sheet PA such as characters, alphanumeric characters, symbols and drawings. Make the image appear. Such a copying machine P uses the fixing device F
The same operation and effect as those described in (1) can be obtained.

The present invention is not limited to the above embodiment. For example, the number of belt-shaped resistance heating elements formed on a substrate is not limited to one, and a plurality of resistance heating elements may be formed.

In the above embodiment, a wiring conductor is formed on the back side of the substrate, and a temperature detecting element such as a thermistor is fixed to the wiring conductor. However, the wiring conductor and the temperature detecting element are not essential. Needless to say, the present invention can be applied to a plate-shaped heater in which these are not formed.

[0061]

According to the first aspect of the present invention, the overcoat layer composed of the lubricating layer covers up to the substrate including the glass layer having the electrical insulation function formed on the surface of the resistance heating element. Further, it is possible to provide a plate-shaped heater having a higher bonding force than the bonding with the glass layer and an improved quality capable of reliably reducing the lubrication layer from peeling off from the substrate.

According to the second aspect of the invention, in addition to the same effects as those of the first aspect, it is possible to increase the bonding force at the glass layer portion.

According to the third aspect of the present invention, the same effects as those of the first aspect can be obtained even when the lubricating layer is formed on the back surface side of the substrate.

According to the fourth aspect of the present invention, it is possible to provide a fixing device capable of smoothly transporting a recording medium such as a copy sheet.

According to the fifth aspect of the present invention, it is possible to provide an image forming apparatus such as a copying machine or a facsimile provided with a fixing device capable of smoothly transporting a recording medium such as copy paper.

[Brief description of the drawings]

FIG. 1 is a plan view of a plate-shaped heater according to a first embodiment of the present invention, in which an intermediate portion is cut away.

FIG. 2 is a bottom view of FIG.

FIG. 3 is an enlarged side sectional view of a portion cut along the line XX in FIG. 1;

FIG. 4 is an enlarged side sectional view of an intermediate portion showing a third embodiment of a plate heater according to the present invention.

FIG. 5 is a vertical sectional side view showing an embodiment of the internal structure of the fixing device according to the present invention.

FIG. 6 is a vertical sectional side view of an internal structure showing an embodiment of a copying machine according to the present invention.

[Explanation of symbols]

 H: plate heater 1: substrate 11: front side 12: back side 2: resistance heating element 3: terminal section 4: glass layer 5: lubricating layer F: fixing device F1: pressure roller F5: heater support F6: fixing Film P: Copy machine PA: Copy paper

Claims (5)

[Claims] 1. A flat substrate having heat resistance and electrical insulation; a belt-shaped resistance heating element formed on a surface of the substrate along a longitudinal direction; and a resistance heating element formed on the substrate and connected to the resistance heating element. An electrode for power supply; a glass layer formed on the surface of the substrate including at least the resistance heating element; a lubricating layer having a different surface state from the glass layer and the glass layer formed on the surface of the substrate; A plate-shaped heater comprising: 2. The plate-shaped heater according to claim 1, wherein the surface of the lubrication layer is rougher than the surface of the glass layer. 3. A flat substrate having heat resistance and electrical insulation; a belt-shaped resistance heating element formed on a surface of the substrate along a longitudinal direction; and a resistance heating element formed on the substrate and connected to the resistance heating element. And a lubricating layer formed on the surface of the substrate opposite to the surface on which the resistance heating element is not formed. 4. A pressure roller; a plate-shaped heater according to claim 1, wherein a lubricating layer portion is disposed opposite to the pressure roller; and the plate-shaped heater and the pressure roller. A fixing film movably provided between the fixing device and the fixing device. 5. A means for adhering toner to an electrostatic latent image formed on a medium and transferring the toner to a sheet to form a predetermined image; and fixing the sheet on which an image is formed by a pressure roller to a fixing film. An image forming apparatus comprising: the fixing device according to claim 4, wherein the fixing device is configured to fix the toner by passing the fixing heater through the fixing heater.