JP3298758B2 - Heat fixing roller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat fixing roller used in a fixing device of an image forming apparatus.

[0002]

2. Description of the Related Art A heat fixing roller 2 'of a conventional fixing device 1'.
As shown in FIG. 5, an etching method, a thick film printing method using stainless steel, alumina, nichrome, TiO ₂ , or the like on a roller base 3 such as a synthetic resin, alumina ceramics, an enameled stainless steel pipe, or the like. The heating resistor 5 is formed by vacuum evaporation or the like, and a power supply unit 6 is provided at both ends of the heating resistor 5, and a power supply brush 7 is provided through the power supply unit 6.
In order to further generate heat from the heating resistor 5 and further improve the releasability of the toner, a Teflon layer was formed of a heat-shrinkable Teflon tube on the surface of the roller base 3 provided with the heating resistor 5. Or a coating of the fluororesin 11 is used. In the case where the heating resistor 5 is formed of the easily oxidized TiO ₂ film 5 ′, Al ₂ O
The heat-resistant anti-oxidation film 12 consisting of ₃ · MgO TiO ₂ film 5 'upper surface of the, is provided on the lower surface, TiO ₂ film 5 by heating'
There has been proposed a device which prevents oxidation of the compound and does not increase the resistance value, which is disclosed in JP-A-59-154478. Reference numeral 4 denotes a pressure roller which rotates in cooperation with the heat fixing roller 2 '.

[0003]

In the conventional heat fixing roller as described above, in order to smooth the surface of the fluororesin, the fluororesin is heated in air to about 380.degree. When firing a fluororesin, the heating resistor is heated to about 380 ° C in air. (1) If the heating resistor is made of stainless steel, it will break down due to high temperature (2) If the heating resistor is made of a material that is easily oxidized such as alumina or nichrome,
There is a problem in that the heating resistor is oxidized by a high temperature for baking the fluororesin and the resistance value is significantly increased.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the conventional heat fixing roller. (1) When the heating resistor is made of stainless steel, a high temperature for firing the fluororesin is used. It is not exposed to heat, does not cause destruction by high temperature, does not change its resistance value, and (2) heat-resistant resistors that are easily oxidized are made of heat-resistant antioxidant Even if a film is not provided on the upper and lower surfaces of the heating resistor, the heating resistor is not oxidized by the high temperature when the fluororesin is baked after coating or coating with the fluororesin, and the resistance value changes. An object of the present invention is to provide a heat fixing roller which does not cause the problem.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a method for manufacturing a semiconductor device comprising:
A roller base on which a heating resistor is formed, and a cylindrical body formed by coating or coating a fluorocarbon resin on a cylindrical base material and separately sintering the roller base to form a roller base other than the power supply portion of the heating resistor The cylindrical body is integrally fixed to an outer surface of the cylindrical body. According to a second aspect of the present invention, in the first aspect, the cylindrical body is integrally fixed to the roller base with an adhesive made of a heat-resistant elastic body. The invention as set forth in claim 3 is a method in which
Alumina and chromium of the roller base on which the heating resistor is formed
Film, or a fluorine resin coated or coated on the outer surface of the non-feeding portion of the heating resistor consisting of TiO _2, is characterized in that it has fired in a fluorine-based resin in an atmosphere to remove oxygen.

[0006]

According to the present invention as described above, according to the first aspect of the present invention, a roller base having a heating resistor formed on a base, and a tubular base material coated or coated with a fluorine-based resin and fired. The cylindrical body is separately formed, and the cylindrical body is fixed to and integrated with an outer surface of the roller base other than the power supply portion. According to a second aspect of the present invention, the adhesive for fixing the cylindrical body to the roller base is made of a heat-resistant elastic body, and the heat-resistant elastic body is heated by the heat generated during actual use to heat the cylindrical body and the heating resistor. Absorb the dimensional difference between the two caused by expansion. Invention according to claim 3, low <br/> la base alumina forming the heating resistor on the substrate, a chromium film, or outside of the non-feeding portion of the origination <br/> thermal resistor made of TiO ₂ After covering or coating the side surface with the fluororesin, the fluororesin is fired in an atmosphere from which oxygen has been removed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment of the present invention shown in FIGS.
The same parts as those in the related art are referred to by the same reference numerals, description thereof will be omitted, and different parts will be mainly described.
1 to 3 showing a first embodiment of the present invention, a heat fixing roller 2 shown in FIG. 1 is formed by using a stainless steel material on a roller base 3 using a heat-resistant resin film such as polyimide as shown in FIG. By forming a pattern of the heat generating resistor 5 and providing a power supply portion 6 at both ends of the heat generating resistor 5 and a cylindrical base material 10 using a heat resistant resin film such as polyimide as shown in FIG. The cylindrical body 9 in which the fluorocarbon resin 11 is coated or coated and the temperature is raised to about 380 ° C. and the fluorocarbon resin 11 is baked is separately manufactured, and the power supply of the heating resistor 5 of the roller base 3 is performed. The cylindrical body 9 is fixed to the outer surface other than the portion 6 by using a silicon-based adhesive 8 to be integrated.

In such a device, since the heating resistor 5 is not exposed to a high temperature for baking the fluorine-based resin 11 and heat is not applied to the heating resistor 5 during the fixing operation,
The heating resistor 5 does not break down at high temperature and does not change in resistance value, so that the surface of the coating of the fluororesin 11 can be made smooth and toner does not adhere to the surface of the heat fixing roller 2.

Although not shown, the second embodiment is different from the first embodiment in that an adhesive 8 for fixing the cylindrical body 9 to the roller base 3 is used.
In this embodiment, a heat-resistant silicone rubber adhesive having a higher elasticity than that used in the first embodiment is used.

In such a case, even when the thickness of the tubular body 9 is small, the surface of the film or coating of the fluororesin 11 can be baked and smoothed, and the dispersion of parts, In addition, distortion generated by thermal expansion between the heating resistor 5 and the cylinder 9 during the fixing operation is absorbed by the heat-resistant elastic adhesive so that wrinkles are not generated on the surface of the cylinder 9.

In the third embodiment shown in FIG. 4, a heating resistor 5 provided on a roller base 3 using a heat-resistant resin film of polyimide or the like uses an alumina, chromium film, TiO ₂ or the like, which easily causes high-temperature oxidation. A fluororesin coated or coated on the outer surface of a roller base 3 provided with a heating resistor 5 using the above-mentioned material.
When performing firing of 11, the heating resistor 5 made of the above-described material is formed on the roller base 3 without providing a heat-resistant antioxidant film on the upper and lower surfaces of the heating resistor 5, and then the heating resistor 5 is formed. 5, a sealing outlet 22 for coating or coating the outer surface of the part other than the power supply part with a fluororesin 11 to discharge air, that is, O ₂ ;
The roller base 3 is placed in a closed electric furnace 20 having a sealing port 23 for feeding N ₂ gas and a heater 21, and air in the closed electric furnace 20 is sucked from a sealed outlet 22. At the same time as discharging, the N ₂ gas is sealed and heated to about 380 ° C. to bake the fluororesin 11.

As described above, the temperature is raised to about 380 ° C. without providing a heat-resistant antioxidant film on the upper and lower surfaces of the heating resistor 5, and the fluorine resin 11 on the surface of the roller base 3 is fired. Is performed, the heating resistor 5 is not oxidized by a high temperature to cause a change in the resistance value, and the film or coating surface of the fluororesin 11 can be smoothed, and the heat fixing roller 2
No toner adheres to the surface of.

[0013]

The present invention is as described above. According to the first aspect of the present invention, there is provided a roller base having a heating resistor formed on a base, and a fluorine base on a cylindrical base. Since the cylindrical body formed by coating or coating with resin and firing is formed separately, and the cylindrical body is integrally fixed to the outer surface of the heat generating resistor of the roller base other than the power supply portion, heat is generated. There is an effect that the resistance does not change due to the high temperature due to the sintering of the fluororesin, the coating surface of the fluororesin can be made smooth, and good fixing can be performed. According to the second aspect of the present invention, since the cylindrical body is integrally fixed to the roller base with an adhesive made of a heat-resistant elastic body, even when the thickness of the cylindrical body is small, the fluorine coating or the coating film is formed. In addition to smoothing the surface, variations in parts and distortion generated by thermal expansion between the heating resistor and the cylinder during use are absorbed by this heat-resistant elastic adhesive and applied to the surface of the cylinder. There is an effect that wrinkles do not occur. According to the third aspect of the present invention , heat is generated on the substrate.
Alumina, chromium film on the roller base on which the resistor is formed , or
Since the outer surface of the heating resistor made of TiO ₂ other than the power supply portion is coated or coated with a fluorine-based resin, and the fluorine-based resin is fired in an atmosphere from which oxygen has been removed, heat is applied to the upper and lower surfaces of the heating resistor. Without providing an antioxidant film
Even if a heating resistor that is easily oxidized is used, the heating resistor does not oxidize and the resistance value does not change, and the coating surface of the fluororesin can be made smooth, so that good fixing can be performed. This has the effect.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a first embodiment of the present invention.

FIG. 2 is a perspective view of a roller base provided with the heating resistor of the first embodiment.

FIG. 3 is a perspective view of the cylindrical body of the first embodiment.

FIG. 4 is a schematic longitudinal sectional view of a closed electric furnace of a third embodiment of the present invention.

FIG. 5 is a schematic perspective view of a conventional fixing device.

FIG. 6 is a schematic longitudinal sectional view of the heat fixing roller of the above.

[Explanation of symbols]

 2 Heat fixing roller 3 Roller base 4 Pressure roller 5 Heating resistor 6 Power supply unit 7 Power supply brush 8 Adhesive 9 Tube 10 Tube base 11 Fluorine resin

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-5-142960 (JP, A) JP-A 64-86185 (JP, A) JP-A 62-153986 (JP, A) JP-A 61-86 134776 (JP, A) JP-A-56-133770 (JP, A) JP-A-63-168674 (JP, A) JP-A-4-235581 (JP, A) (58) Fields investigated (Int. ⁷ , DB name) G03G 13/20 G03G 15/20

Claims (3)

(57) [Claims] A roller base having a heating resistor formed on a base and a cylindrical base formed by coating or coating a fluorocarbon resin on a cylindrical base are formed separately to generate heat of the roller base. A heat fixing roller, wherein the cylindrical body is integrally fixed to an outer surface of the resistor other than the power supply portion. 2. The heat fixing roller according to claim 1, wherein the tubular body is integrally fixed to the roller base with an adhesive made of a heat-resistant elastic body. Wherein the roller base forming a heating resistor on a substrate of alumina, chromium film, or a fluorine resin coated or coated on the outer surface of the non-feeding portion of the heating resistor consisting of TiO _2, fluororesin Characterized by baking in an atmosphere from which oxygen has been removed.