JPH1152771A - Heating device and image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a heating device whose life is not shortened in spite of higher operation speed by providing a protecting member at the end in the width direction of a moving body and providing at least a heater substrate and a pressure member inside so that they may be shorter than the length in the width direction of the moving body. SOLUTION: A back surface electrode type alumina heater 5' having a back surface electrode 11' where an electrode part is formed on a substrate back surface opposite to heating surface through a through-hole 19 is used as an alumina heater and connected to a connector 14 inside a heater holder 10. Then, a reinforcing ring guide groove 17' deep enough to completely house the inside projection part of a reinforcing ring 17 is formed on the surface of the heater holder 10 around the end of fixing film and the surface of a flange 13'. The rubbing property of the end of the film on a film position regulating member is improved by the ring 17, and the ring 17 is housed more inside than the film contact surface of the heater holder 10 in the groove 17'. Therefore, film carrying performance is prevented from being deteriorated and the end of heater film is prevented from projecting from the surface of the heater holder.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a substrate (insulating substrate)
A heating device having a heater substrate provided with a heating element on a plate);
And a material to be heated using the heating device as a heat fixing device.
Permanent image of heat-softening colored powder image formed on recording material
An electrophotographic printer that heats and fixes as an image,
It relates to image forming devices such as copiers and facsimile machines.
is there. 2. Description of the Related Art Conventionally, a printer using an electrophotographic system
Recorded by image forming equipment such as printer, copier, facsimile, etc.
A device that heats and fixes unfixed images formed on materials
Wide range of contact heating type heating devices with good thermal efficiency and safety
Well known. In recent years, especially in view of promoting energy saving
Therefore, a system with high heat transfer efficiency and a fast start-up
Heat-resistant film (hereinafter referred to as a moving body with small heat capacity)
Below, called film or fixing film)
Therefore, a film heating device that heats the recording material is attracting attention.
For example, Japanese Patent Application Laid-Open No. 63-313182,
JP-A-1577878, 4-44075-44083
Gazette, 4-204980-2044984
Have been. The structure of this film heating apparatus is as follows: a. Roller and driven roller dedicated to film transport
Using a pressure roll while applying tension to the film.
A method of transporting the film to and from the camera; b. The cylindrical film is driven by the conveying force of the pressure roller
There is a method, the former has the advantage that film transportability can be improved
The latter simplifies the configuration and reduces the cost of the heating device.
There are benefits that can be realized. FIG. 8 shows the latter type of film processing with a pressure roller drive type.
This shows a cross section of the configuration of the heating device.
Reference numeral 2 denotes an image formed by the toner formed on the recording material 1;
Is a pressure applied to the film 4 with a total pressure of about 4 to 15 kgf.
The pressure roller 3 is interlocked with the shaft 3a.
Driven by a drive source (not shown)
You. 10 is a heater holder which also serves as a guide member for the film 4.
And a concave portion 1 formed on a surface where the film 4 contacts.
The heater 5 is supported in the area 0. The fixing film 4 has a reduced heat capacity.
Film thickness to improve quick start
μm or less, more preferably 40 μm or less and 20 μm or more
PTFE, PFA, P with heat resistance, release property and durability
PS single layer film or polyimide, polyamide
PTFE, PEK on the film surface such as
Multi-layer containing FA and FEP coated as release layer
It is composed of film. On the other hand, the heater 5 is made of a heat resistant material such as ceramics.
Heating element 8 is patterned on heater substrate 6 made of edge material
The surface is protected by heat-resistant glass 9. In addition
A temperature detecting element 7 is arranged on the back surface of the
A structure for controlling the temperature by detecting the temperature of the temperature detecting element 7.
It has become. FIG. 9 is a front view of a heating element forming surface of the heater 5.
It is a figure, and the heating element 8 consists of a belt-shaped pattern,
Is made of silver palladium (Ag / Pd), RuO2, Ta
A silver platinum (A) formed on the substrate surface with an electric heating element such as 2N
g / Pt)
Is what you do. FIG. 10 is a rear view of the heater substrate.
In order to control the substrate temperature, the temperature detecting element 7
Low resistance silver palladium with a Pd ratio of 30% or less
Sensing element wiring 7 ′ formed with a through hole for conduction
Temperature detecting electrode 1 formed on the substrate surface via 11 '
1 and a detection circuit (shown in FIG.
Without). On the heater substrate 6, a heater 5 is provided.
As a safety measure in case of thermal runaway, the through hole 12 is near the end
Is provided. Due to the presence of the through holes 12, the substrate temperature
When the temperature reaches the excessive temperature range, the thermal expansion of the ceramic substrate
At the boundary between the part with and without the through hole 12
The generated stress difference is also large, and the
Cracks occur mainly in the region with low mechanical strength, and the heater
The heating element 8 formed on the substrate 6 is also disconnected and the heater 5
Thermal runaway is stopped. A printer using the above heating device
Various image forming devices, such as, as described above, high heating efficiency
Eliminates the need for preheating during standby due to the speed of rising
It has many advantages such as time savings, especially cylindrical
The method of driving the film with the conveying force of the pressure roller is low cost.
Starting with the introduction to small and low-speed machines.
In the future, introduction to large high-speed machines is expected.
ing. In order to realize this high speed, first, of course,
Powering up the motor,
Increase the rotation speed of the fixing film and
In order to supply sufficient heat energy to the shortened paper,
Set the heat temperature even higher or increase the pressure of the pressure roller.
Heater substrate 6 and fixing film 4
Improvement such as replacing the material with a material with high thermal conductivity
There is a need. However, such improvements have been promoted and
That is, the deterioration of the fixing film 4 is promoted.
Therefore, there is a danger that the durability life is shortened.
In particular, the deterioration of the edge of the fixing film 4 is a factor in increasing the speed.
It was an important issue. FIG. 11 is a sectional view of the right half of the heating device in the width direction.
The right end of the fixing film 4 is a heater holder.
The heater holder is inserted into the right end of the
10 by the side wall of the flange 13
Is restricted from moving to the right from this position.
You. Further, the positional relationship of other components in the width direction.
First, a pressure roller exists at a position facing the heating element formation area.
There is almost no route to take away the heat generated if it is not present,
An abnormal temperature rise of the heater substrate 6 occurs at that portion,
Heater substrate because it may damage the substrate
6 heating element 8 is the shortest and located at the center
The roller 3 is longer than the heating element 8 and its end is located outward.
It is location. On the other hand, the heater substrate 6 serves as an electrode at the end of the substrate.
Board of connector 14 connected to power supply side by cable 16
Since the contact 15 needs to be connected, the pressure roller 3
The end is extended outward from the end of the flange 13
Right half length of substrate and half length of fixing film
Inevitably 1 / 2Lh> 1 / 2Lf during 1 / 2Lf
The relationship was maintained. Further, the fixing film 4 generates heat as described above.
Sandwiched between the heater substrate 6 and the pressure roller 3 in the body formation region
The film edge must be at least
It must be located outside the end of the heating element. The fixing film 4 has a heating element end and a connector device.
Between the side wall of the flange 13 fixed inside the attachment portion
Although it can be moved, either right or left immediately during use
It moves easily and collides with the flange side wall, and the film end
Thereafter, always rotate while rubbing against the flange side wall.
And If the film 4 continues to be rubbed as it is,
Degradation progresses from the edge of the film, and finally the film
Tears and becomes unusable. Also, the rotation of the film 4
The higher the speed, the higher the rate of degradation and the shorter the durable life.
The end of the fixing film 4
This has been a major issue in the process. Further, fixing is performed to secure a sufficient fixing property.
It is necessary to increase the temperature, increase the pressure, and change the material to a high heat conductive material.
In short, the life of the fixing film 4 is further shortened,
In order to improve the thermal conductivity of the fixing film 4, BN or A
High thermal conductivity filler such as 1N mixed into film resin
Increasing the ratio will impair the inherent flexibility and strength of the resin.
The film's deterioration speed, and the durability life
It becomes easier. Further, when a metal film is used,
Thermal conductivity can be dramatically increased, further increasing
Fast heating is possible, but when using metal film
In addition to the damage caused by the rubbing of the film edge,
Even if there are slight steps or protrusions on the
Cracks in a short period of time, shortening the service life
There were challenges. In addition, such a cylindrical film rotating body has
As a means to reinforce the ends, generally shown in FIG.
It has an L-shaped cross section like two large and small rings
And use the reinforcing ring 17 to
Approximately equal to the inner diameter of the film and fill as shown in FIG.
Attach to the inside of the end of the
By appropriately adjusting the rigidity and hardness of the reinforcing ring of the side wall
And the deformation rate of the film at the end
A method to suppress film degradation due to deformation
available. However, as shown in FIG.
In the conventional equipment, the heater base is always placed on the pressing surface side of the film end.
Since the plate 6 exists, the circular shape is to be maintained as it is.
When the reinforcing ring 17 is attached to the end of the film,
Fill at the end of the heater as shown by the hatched portion in the sectional view of FIG.
The area that is not in contact with the system is the thickness of the ring and the heater substrate
Creates a gap determined by the rat face width and the inner diameter of the ring,
In addition to locally increasing the temperature of the heater end, FIG.
The end of the film attached with a ring as shown in (C) is the pressed part
Film edge formed from the edge to the ring fixing part
Conversely, due to the trumpet-like extreme deformation 4 '
4 and the adverse effect of promoting the deterioration of the heater peripheral members.
Therefore, it is difficult to attach the reinforcing ring 17 as described above.
It was difficult. [0024] The conventional heating device has been described above.
The heater substrate and heat-resistant filter
Speed up the heating device in the heating device using lum.
When trying to do so, the severity of the operating conditions increases and the film itself
Due to the need for improvements and changes, this film
It may be damaged by rubbing against the side wall and pressing surface of the material, shortening the service life.
There was a problem to be. The present invention has been made to solve the above problems.
The life is not shortened even if the speed is increased
It is an object to provide a heating device. This heating equipment
To form a high-quality image
To provide an image forming apparatus capable of
You. The present invention has the following configuration.
Heating device and an image using the heating device
An image forming apparatus. (1) A pressure member that presses against the surface of a moving body to form a pressure contact portion
And a heater substrate provided with a heating element.
In a heating device that heats a material to be heated while holding the material,
The moving body end and the moving body holding at the width direction end of the moving body
Protective members are provided to prevent the side plates of the members from directly rubbing.
At least the heater substrate and the pressing member
Being shorter than the width of the moving body and provided inside
Is a heating device. (2) The length in the width direction and the positional relationship of each component are determined by the side plate,
Protective member, moving body, heated substrate heating surface end, pressing member,
It is characterized in that it is provided short and inside in the order of heating elements
(1) The heating device according to (1). (3) The heater substrate is an insulating substrate against which a moving body is pressed.
The heating element formed on the surface and the surface of the heating element
A glass coat layer and wiring for energizing the resistance heating element.
(1) or (2), characterized by comprising an electrode.
Heating device. (4) The electrode is opposite to the moving body pressing surface of the insulating substrate.
The feature described in (3), which is provided on the opposite side.
It is a heat device. (5) The heater substrate is made of aluminum nitride as an insulating substrate.
Using a ceramic substrate of nickel, the resistance heating element and the
The glass coat layer and the wiring are insulated at the pressure contact part
Make sure that it is provided on the opposite side of the
The heating device according to (4), which is characterized in that: (6) The moving body has a heat-resistant cylindrical shape with a thickness of 150 μm or less.
Film, the protection member is the heat-resistant cylindrical film end
It is a heat-resistant resin ring bonded or adhesively fixed to the part
(1) The heating device according to (1). (7) The moving body has a heat-resistant cylindrical shape with a thickness of 150 μm or less.
The metal film and the protection member are the heat-resistant cylindrical metal foil.
Heat-resistant resin phosphor bonded or adhered to the film end
(1) The heating device according to (1),
You. (8) For the heat-resistant cylindrical metal film pressure contact surface of the component
Is characterized in that there is no unevenness of at least 10 μm.
(7) The heating device according to (7). (9) An image form for forming a thermosoftening colored powder image on a recording material
Forming process means and recording the thermosoftening colored powder image
From (1) to form a permanent image by heat fixing on the material
(8) The heating device according to any one of (8)
An image forming apparatus characterized in that: Embodiments of the present invention will be described below.
This will be described with reference to the accompanying drawings. Embodiment 1 FIG. FIG. 1 shows heating according to Embodiment 1 of the present invention.
It is a right half sectional view of an apparatus. In FIG. 1, FIG.
The same reference numerals are given to the same parts as. Embodiment 1
Then, the electrode part is used as an alumina heater through hole 19.
Back electrode 1 formed on the back surface of the substrate opposite to the heating surface via
Using a back electrode type alumina heater 5 'having a 1'
Method to connect with the Nectar 14 inside the heater holder
Is used. By using this configuration, the heater
Projections can be removed from the end of the heater substrate on the heating surface side
Therefore, shorten the end of the heater substrate to 1 / 2Lh '.
And the relationship between the heater substrate length and the film length is Ｌ Lh ′
<1 / 2Lf. As a result,
A heater substrate can be arranged inside the film 4
Therefore, the table of the heater holder 10 around the end of the fixing film is shown.
Surface and flange 13 'surface, the inside protrusion of the reinforcing ring 17
Reinforcement ring guide groove 17 'of sufficient depth to accommodate
Can be provided. [0029] A reinforcing ring is formed along with the groove with the film.
A reinforcing ring is provided at the end of the film by rotating it
Even if the film edge does not float, the film edge
Do not cause excessive temperature rise of the peripheral members or extreme deformation of the film.
The heater end can be reinforced and the durable life of the film
The speed of the apparatus can be increased without lowering the power. In the first embodiment, the devices are assembled.
The procedure for setting is to use an alumina heater with a heat-resistant adhesive.
After fixing to the heater holder with
A connector is connected to the back electrode 11 'exposed from the drilled hole.
14 and connect the fixing film 4 in the longitudinal direction from the end.
Open end type that covers while riding and eliminates the outer side wall
After mounting the flange 13 ', on the contact surface with the film
Insert and fix the reinforcing ring 17 to which the adhesive has been applied.
An independent outer side wall 18 is fixed to the outer side of the outer side. At this time,
The fixing film is formed on the inner side wall of the open end flange 13 '.
Extremely strong against being pressed against the opposite side wall
This step is inside the heater holder
Is formed by deforming, and this flange 13 ′ is discarded.
It is also possible to stop and simplify the assembly process. In the above configuration, the reinforcing ring 1
7 is made of a POM material having a thickness of about 2 mm, and the outer side wall is made of metal.
Using a ring-shaped disk made of P
The OM reinforcement ring is gradually scraped by sliding against the metal plate
This reduces the rubbing resistance and reduces the mechanical
The load is also set to be reduced. By using the structure of the first embodiment,
And increase the heating temperature to process 16 sheets per unit time
Sufficient fixability is obtained even if the speed is increased from
After changing the temperature control so that the
Increase the rotation speed of Lum by 1.5 times to process 24 sheets
When the durability test was performed, the durability test was performed for 1000 hours or more.
Without causing problems such as breakage of the film edge.
Durability could be obtained. As described above, according to the first embodiment,
For example, the film edge and the film position are
Improves the rubbing performance with the positioning member and also provides a reinforcing ring guide
The reinforcing ring 17 is attached to the heater holder 10 by the groove 17 '.
Film inside the film contact surface
Of the heater film without deteriorating the transportability of the film
Can cause deformation that protrudes from the heater holder surface.
Without reducing the durability of the film
It is possible to increase the speed of the heating device. Embodiment 2 FIG. FIG. 2 shows heating according to the second embodiment of the present invention.
It is a right half sectional view of an apparatus. In FIG. 2, FIG.
The same reference numerals are given to the same parts as. Embodiment 1
Then, the polyimide film of the first embodiment is used as a fixing film.
Instead of film, use this polyimide film as the base
BN (boron nitride) as a thermal conductivity improving material
Thermal conductivity with about 40% of filler dispersed by volume
It uses an improvement film 4 '.
The thermal conductivity from the heater substrate 6 to the pressure roller 3 side
It is configured to realize high speed by improving
You. A filler for improving thermal conductivity such as BN is used.
If mixed at such a high rate, polyimide foil of the same thickness
The thermal conductivity is improved to about 2.3 times compared to the film.
Can greatly improve the heating performance and increase the heating rate.
While it is possible to greatly increase the cost,
When the amount of filler mixed is reached, the fixing film 4
The conventional flexibility and abrasion resistance are remarkably lost, and
The life is shortened and the speed is further increased even if the endurance is rotated at the same speed.
Use greatly shortens the durable life and obtains practicality.
I couldn't. However, in the second embodiment, such
Combining the film reinforcement measures of Embodiment 1 with the fixing film
The rotation speed of the film of the 16-sheet processing machine
Endurance test as a 24-sheet processing machine
After applying, the end of the film even if it lasts more than 1000 hours
Sufficient durability without problems such as breakage of parts
I was able to. The heating temperature is further improved by improving the thermal conductivity of the film.
High-speed heating is possible without increasing the temperature
There is no need to improve the heat resistance of the peripheral members of the substrate,
Leaks are also reduced, while suppressing an increase in power consumption.
It is possible to provide a highly efficient image forming apparatus capable of speeding up.
You. Embodiment 3 FIG. FIG. 3 shows heating according to Embodiment 3 of the present invention.
It is a right half sectional view of an apparatus. In FIG. 3, FIG.
The same reference numerals are given to the same parts as. Embodiment 3
Then, the fixing film 4 "of the first embodiment is used as the fixing film 4".
Endless shape made of Ni electroforming instead of film
Metal film 4 ″ is used, and is the same as in the second embodiment.
Without changing the heating temperature.
Higher speed by improving thermal conductivity to the roller 3 side
1 shows the configuration. By using this metal film,
Thermal conductivity can be several hundred times higher than conventional resin film
Possible, dramatically improving the heating characteristics and increasing the heating rate.
On the other hand, it is possible to increase the thickness further,
When using a thin metal film of about μm,
The mechanical strength of the part decreases,
The edge cracks in a very short time,
Small protrusions on the heater holder side of the nip area
Even if there is a step, local scratches and permanent deformation are circular from that part
Occurs in the circumferential direction of the tubular film and cracks rapidly from that part
Grows and the film is cut in the circumferential direction.
Occur. For this reason, in the third embodiment, the film edge
The part reinforcement measure is performed in the same manner as in the first and second embodiments.
In addition to the surface of the heater substrate,
At least 10 μm or less on the surface that contacts the fixing film 4
Polishing the surface of the ceramic substrate so that there are no irregularities
The edge of the board is rounded, and the heater holder and resin table
0.1 m so that no irregularities of 10 μm or more
m and a smooth curve with a radius of curvature of
In addition to the measurement, those without burrs or scratches are used. Further, each of the above-described examples using a resin film
Although not specifically stipulated in Embodiments 1 and 2,
The heater substrate 6 and the
If a boundary surface of the heater holder 10 exists, this boundary surface
Then, due to the assembly tolerance, there is always a slight step
I will. The pressure roller 3 faces the step formed at this time.
The pressure roller surface deforms following this step
And permanently deform the metal film so that it conforms to this step shape
The metal film is deformed.
Cracks start to form from the tip. Therefore, using such a metal film
In the case where the speed is increased by using
Between the end of the fixing film and the end of the heater substrate specified in 1 and 2.
In addition to the positional relationship 1 / 2Lh '<1 / 2Lf, a heater
Substrate edge (more precisely, at the edge of the heater substrate heating surface
In this case, it can be defined as the end of the glass coat surface.
) Is always located outside the end of the pressure port.
It must be set to a length that is
If the length of the pressure roller is 1 / 2Lr, it is always 1 / 2Lh '
> 1 / 2Lr must be maintained.
It is necessary. If this condition is satisfied, the pressure roller
3 on the back side of the fixing film in the area pressed
Since there is always a flat heater substrate surface, fill
No deformation occurs in the system 4, and the ring reinforced
Even if it lasts more than 1000 hours together with the end of the film
Sufficient durability without problems such as end breaks
I was able to. Embodiment 4 FIG. FIG. 4 shows heating according to Embodiment 4 of the present invention.
It is a right half sectional view of an apparatus. In FIG. 4, FIG.
The same reference numerals are given to the same parts as. Embodiment 4
Now, the back surface in which the heating element 8 is formed on the back side of the heater substrate 6 '
Heated aluminum nitride (hereinafter abbreviated as AlN)
Heater 5 "and improve the thermal conductivity of the heater substrate 6 '.
As well as realizing high-speed fixing,
Heater element without using through holes
The electrode 11 on the forming surface can be used as it is
Have the advantage. For the purpose of speeding up the heating process, a heater
As the substrate 6 ′, a heating element 8 of a heater 5 ″ and a heating nip
High thermal conductivity as possible while having insulation between the surface
High mobility of heat in the thickness and lateral directions with the interposition of members
However, in recent years, ceramic substrates
Better heat conduction than alumina substrate used for heater
An AIN substrate 6 'having a property has been developed. The A1N substrate 6 'is made of a conventional alumina-based
There are advantages mainly in characteristics as shown in Table 1 as compared with the plate.
As can be seen from Table 1, compared to the alumina substrate, the AlN group
Since the thermal conductivity of the plate 6 'is about 11 times higher, the same energy
Enables faster and more uniform substrate temperature distribution
Since the thermal shock resistance is about twice as high, the heating element 8
Substrate breakage due to rapid heating even when used at high temperature
There are a number of advantages that are more difficult. In particular, the AlN substrate 6 ′ is a glass coat layer.
Noting that it has a higher thermal conductivity, as shown in FIG.
As the heater substrate, the same size as the conventional alumina substrate
Of the AlN substrate 6 '
A heating element and electrodes are formed, and the back surface of the substrate is used as a heating surface in FIG.
Glass coating layer 9 and temperature detecting element 7
Backside heating type to place the fixing nip in the direction of the backside of the substrate
By using the AlN heater 5 ″, the heat generated in the heating element 8 was generated.
Transfers heat to the pressure roller approximately 10 times faster than the conventional heater 5.
available. As a result, the heater of the alumina substrate 6
The AIN substrate 6 'is completely
It has a high effect of heating evenly and broadly with the body.
Can also maintain high heating properties. Also, in the longitudinal direction
Recording is small because the temperature distribution of
Excessive temperature rise in the non-passing area, which is a problem when the material passes continuously
Also has the effect of alleviating. As described above, the surface opposite to the surface on which the heating element 8 is formed is
Use an AIN substrate 6 'that heats the material to be heated on the side surface.
Means through holes in the electrodes as in the above embodiments.
It is not necessary to provide
In combination with measures to improve the durability of the fixing film
High-speed heating device that can be easily applied can be configured, and over 1000 hours
Even if it is durable, it will not cause problems such as damage to the film edge.
And sufficient durability could be obtained. [Table 1] Embodiment 5 FIG. FIG. 7 shows a heating device according to the control method of the present invention.
Showing an image forming apparatus provided with a heat fixing device 31 as a fixing device.
FIG. 7 shows a photosensitive drum 32 in FIG.
Photosensitivity of 0PC, Amorphous Se, Amorphous Si, etc.
Cylindrical substrate made of aluminum or nickel
Is formed on. This photosensitive drum 32 is in the direction of the arrow.
First, the surface is charged by the charging device 33.
And is uniformly charged. Next, according to the image information, 0N / 0F
Scanning exposure by laser beam 34 controlled by F
As a result, an electrostatic latent image is formed. This electrostatic latent image is
At 35, it is developed and visualized. As a development method, Jean
Ping development, two-component development, FEED development, etc.
Use a combination of image exposure and reversal development
Is often done. The visualized toner image 2 is
The paper feed roller 37 and the timing roller 38
As a transfer device on the recording material 1 conveyed at the timing
Is transferred from the photosensitive drum 32 by the transfer roller 39.
It is. At this time, the recording material 1 includes a photosensitive drum 32 and a transfer roller.
39 to the heat fixing device 31
Conveyed, the toner image is fixed on the recording material by heating as a permanent image
Is done. On the other hand, the transfer residue remaining on the photosensitive drum 32
Residual toner is exposed to light by the cleaning device 40.
It is removed from the surface of the ram 32. The image of the fifth embodiment
The image forming apparatus is 600 dpi, 16 sheets / minute (process
Print at a speed of about 94mm / sec)
Wear. Note that the photosensitive drum 32 is used to remove the cleaning device.
The image forming process means 41 is constituted by 40.
You. As described above, according to the present invention, the heating substrate
And a heating device using a heat-resistant film
So that the heater substrate is fixed inside the film edge
So that a reinforcing ring and its
Guide groove can be provided on the heater holder surface
Heating device that does not shorten the durable life even if the speed is increased
There is an effect that can be obtained. Also, this heating device
High-quality fixed image is obtained because it is used as a heat fixing device.
There is an effect that an image forming apparatus that can be provided can be provided. Further, the above-mentioned heating device is used as a heating fixing device.
According to the image forming apparatus of the present invention to which the present invention is applied, fixing unevenness and recording
It is possible to prevent poor transport of recording materials and obtain high-quality images.
There are effects such as being able to do.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal right half sectional view of a heating device according to a first embodiment of the present invention. FIG. 2 is a longitudinal right half sectional view of a heating device according to a second embodiment of the present invention. FIG. 3 is a longitudinal right half sectional view of a heating device according to a third embodiment of the present invention. FIG. 4 is a longitudinal right half sectional view of a heating device according to a fourth embodiment of the present invention. FIG. 5 is a perspective view of an AIN heater. FIG. 6 is a configuration sectional view of a heating device using an AIN heater. FIG. 7 is a schematic diagram of an image forming apparatus in which the heating device of the present invention is applied as an image fixing device. FIG. 8 is a sectional view showing the configuration of a conventional film heating apparatus. FIG. 9 is a front view of a heater substrate. FIG. 10 is a back view of the heater substrate. FIG. 11 is a longitudinal right half sectional view of a conventional heating device. FIG. 12 is a perspective view of a film end reinforcing ring. FIG. 13 is a cross-sectional view of a film end on which a film end reinforcing ring is mounted. [Description of Signs] 1 recording material, 2 toner, 3 pressure rollers, 4, 4 ',
4 "fixing film, 5, 5 ', 5" heater, 6,
6 'heater substrate, 31 heat fixing means, 41 image forming process means

Claims (1)

Claims: 1. A pressing member for pressing a surface of a moving body to form a pressing portion, and a heater substrate provided with a heating element, wherein the pressing member holds a material to be heated. In the heating device for conveying and heating, a protecting member is provided at an end in the width direction of the moving body to prevent the end of the moving body and a side plate of the moving body holding member from directly rubbing, and at least the heater substrate and the The heating device, wherein the pressing member is provided on the inner side shorter than the length in the width direction of the moving body. 2. A method according to claim 1, wherein the length and the positional relationship of each component in the width direction are determined by a side plate, a protection member, a moving body, an end of a heater substrate heating surface,
The heating device according to claim 1, wherein the pressure member and the heating element are provided short and inside in order. 3. The heater substrate includes: a resistance heating element formed on an insulating substrate surface against which the inner surface of the moving body is pressed; a glass coat layer covering the resistance heating element surface; and a wiring and an electrode for energizing the resistance heating element. 2. The method according to claim 1, wherein
Or the heating device according to claim 2. 4. The heating apparatus according to claim 3, wherein the electrode is provided on a surface of the insulating substrate opposite to a moving body pressing surface. 5. The heater substrate uses an aluminum nitride ceramic substrate as an insulating substrate, and the resistance heating element, the glass coat layer, and the wiring are provided on a surface of the insulating substrate opposite to a moving body pressing surface. The heating device according to claim 4, wherein 6. The heat-resistant cylindrical film having a thickness of 150 μm or less, and the protective member is a heat-resistant resin ring bonded or adhered to an end of the heat-resistant cylindrical film. The heating device according to claim 1. 7. The moving body is a heat-resistant cylindrical metal film having a thickness of 150 μm or less, and the protection member is a heat-resistant resin ring bonded or adhered to an end of the heat-resistant cylindrical metal film. The heating device according to claim 1, wherein 8. The heating apparatus according to claim 7, wherein the heat-resistant cylindrical metal film press-contact surface of the component has no irregularities of at least 10 μm. 9. An image forming process means for forming a heat-softening colored powder image on a recording material, and heat-fixing the heat-softening colored powder image on the recording material to form a permanent image. An image forming apparatus comprising: the heating device according to any one of claims 1 to 8.