JPH08156165A - Heating laminated structure - Google Patents

Abstract

PURPOSE: To obtain a small-sized, lightweight, and long-life heat generating laminated structure the temperature of which can be increased quickly and which can be heated uniformly by forming a heat generating body layer, an electrical insulating body, and heat conductive body layer in sequence on the external surface a heat resistant resin molded article. CONSTITUTION: A heat conductive body layer 5 of Cu or Ni is placed on an electrical insulating body layer 4, and a silicone resin paint is applied on the layer 5 and dried so that an electrical insulating body layer 4a is formed on the layer 5. Both end parts of a structure 1 are not covered with the layer 4, the layer 5, and the layer 4a to make the layer 3 be exposed, and power application use electrode terminals are set in the exposed part. By passing the current through the layer 3, heat is transmitted to the layer 5. Since the layer 5 has greater heat conductivity than the layer 3, the dispersion of temperature in the layer 3 is eliminated in the layer 5 to make the temperature uniform. Since a core material of a heat resistant resin molded article 2 is used, the structure 1 is lightweight. In addition, since the layer 3 and the layer 5 are electrically insulated from the layer 4, they can be formed using optional materials, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-generating laminated structure, such as a fixing roll, used for fixing (heat fixing) a carbon toner image transferred on a recording paper in a printer, a facsimile machine, a copying machine or the like. is there.

[0002]

2. Description of the Related Art A recording system using powder or liquid as a developing material, for example, an electrophotographic recording apparatus, has a structure in which a fixing roll and a pressure roll are opposed to each other via a conveyance path of a recording medium such as printing paper. Are known. In such a fixing device, the carbon toner transferred to the recording medium is heated and melted by the heat of the fixing roll (heat fixing roll), and the carbon toner is recorded by applying pressure between the fixing roll and the pressure roll. Fix it on the medium. This fuser roll has
There are those using a heat roll, those using flash light, and those having a nichrome layer provided on a ceramic plate.

The temperature of these fixing rolls at the time of toner fixing is required to be around 200 ° C., and in order to maintain a predetermined temperature, an indirect heating system and a direct heating system have been devised. As an indirect heating type heat fixing roll,
It is common to insert a halogen lamp into a rotating hollow roll and transfer the heat to the roll by the radiant heat of the halogen lamp. As the heat fixing roll of the direct heating method, a method of heating by energizing the nichrome layer provided on the outer surface of the metal hollow tube through the electric insulator layer, or an electric insulator layer inside the metal hollow tube A method of heating by energizing the carbon fiber layer provided via, winding the nichrome wire around the electrically insulating core material, fixing with ceramic cement, sealing with a metal tube filled with metal powder etc., energizing the nichrome wire A method of heating by heating is known.

[0004]

The conventional indirect heating method has the drawback that the heat is transmitted to the roll by the radiant heat of the halogen lamp, so that the preheating time is long and the energy efficiency is low. To remedy these drawbacks,
A direct heating method was considered. However, the energization heating method in which an electric insulating layer such as a heat-resistant resin is provided on the outer surface of the metal tube has a drawback that variations in temperature of 20 ° C. or more occur and unevenness in the density of the fixed image occurs. . Therefore, heat rolls with improved temperature unevenness have been proposed in JP-A-5-80670 and JP-A-5-278141. However, in the former, the nichrome wire was wound around the electrically insulating core,
It is fixed with ceramic cement and sealed with a metal tube filled with metal powder, and the manufacturing process is complicated, and the heat roll itself is heavy. On the other hand, the latter is one in which glass fibers and carbon fibers are fixed and integrated with a heat-resistant resin inside a metal hollow tube, and the manufacturing process is a fibrous shape according to the shape of the pipe with a length of about 30 cm. After the glass and carbon are set inside, pressure is applied from the inside to heat and bond them together, which is technically complicated and has the drawback that the production yield of thermo rolls with a certain heat generation efficiency deteriorates. It was Furthermore, the weight of the heat roll itself has become slightly lighter than the conventional product, but the drawback of being still heavy due to the use of metal pipes has not been solved, and the cost is high because expensive carbon fiber is used. Also had. In other words, since the fixing roll is used in a configuration opposed to the pressure roll, it is necessary to have a structural strength of a certain value or more in order to withstand the pressure of the pressure roll. Uses a metal hollow pipe as a structural material that bears strength, and as described above, it still has the disadvantage peculiar to metal that it is heavy. The object of the present invention is to increase the temperature quickly,
An object of the present invention is to provide a heat-generating laminated structure that can be uniformly heated, is small and lightweight, and has a long life and is used for a fixing roll or the like.

[0005]

A first aspect of the present invention relates to a heat generating laminated structure in which a heat generating layer, an electric insulator layer and a heat conductor layer are formed in this order on the outer surface of a heat resistant resin molding. It is a thing. A second aspect of the present invention relates to the heat-generating laminated structure according to the first aspect, wherein the heat-resistant resin molding is a hollow pipe. A third aspect of the present invention relates to the heat-generating laminated structure according to the first aspect, characterized in that the heat-generating layer, the electrical insulator layer and the heat conductor layer are formed by thin film coating. The fourth aspect of the present invention is
In the first invention, the heat-resistant resin is a thermotropic liquid crystal polymer, which relates to a heat-generating laminated structure.

The present invention will be further described below. The heat resistant resin used in the present invention means the deflection temperature under load (AS
TM D648, a thermoplastic resin having a load of 18.5 kgf / cm ² ) of 195 ° C. or higher. A weighted deflection temperature of 195 ° C. or higher is required for use as a heating element. As the resin, any conventionally known thermoplastic resin can be adopted as long as the deflection temperature under load satisfies the above conditions. For example, polyphenylene sulfide, polysulfone, wholly aromatic polyester, polyetheretherketone, polyetherimide and the like are preferably used. These can be reinforced with inorganic fillers. In consideration of heat resistance and moldability, thermotropic liquid crystal polymer is preferable.

The thermotropic liquid crystal polymer referred to in the present invention is a polymer which exhibits optical anisotropy when melted and has thermoplasticity. As described above, the polymer exhibiting optical anisotropy when melted has a property that the polymer molecular chains have a regular parallel arrangement in the melted state. The properties of the optically anisotropic molten phase can be confirmed by a usual polarization inspection method using a crossed polarizer. Examples of the liquid crystal polymer, for example, liquid crystalline polyester, liquid crystalline polycarbonate,
There are liquid crystalline polyester imides, and specifically,
(All) aromatic polyesters, polyester amides, polyamide imides, polyester carbonates, polyazomethines and the like can be mentioned. Thermotropic liquid crystal polymers are generally elongated and have a flat molecular structure, and have high rigidity along the long chain of the molecule. In the thermotropic liquid crystal polymer used in the present invention, a part of one polymer chain is composed of a polymer segment forming an anisotropic melt phase, and the remaining part is a polymer segment not forming an anisotropic melt phase. Polymers composed of are also included. Also,
A composite of a plurality of thermotropic liquid crystal polymers is also included.

Typical examples of the monomer constituting the thermotropic liquid crystal polymer include (A) at least one aromatic dicarboxylic acid, (B) at least one aromatic hydroxycarboxylic acid compound, and (C) aromatic diol. At least one compound, (D) (D ₁ ) aromatic dithiol, (D ₂ ) aromatic thiophenol, (D ₃ ) at least one aromatic thiolcarboxylic acid compound, (E) aromatic hydroxylamine, aromatic An aromatic compound such as at least one kind of group diamine-based compound can be used.
In some cases, these are composed independently, but in most cases (A)
And (C); (A) and (D); (A), (B) and (C);
(A), (B) and (E); or (A), (B),
(C) and (E) are combined and configured.

The above-mentioned (A) aromatic dicarboxylic acid type compounds include terephthalic acid, 4,4'-biphenyldicarboxylic acid, 4,4'-terphenyldicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 1,4- Naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, diphenyl ether-4,4'-dicarboxylic acid, diphenoxyethane-
4,4'-dicarboxylic acid, diphenoxybutane-4,4'-
Dicarboxylic acid, diphenylethane-4,4'-dicarboxylic acid, isophthalic acid, diphenylether-3,3'-dicarboxylic acid, diphenoxyethane-3,3'-dicarboxylic acid, diphenylethane-3,3'-dicarboxylic acid, 1,6
-Aromatic dicarboxylic acids such as naphthalenedicarboxylic acid, or chloroterephthalic acid, dichloroterephthalic acid, bromoterephthalic acid, methylterephthalic acid, dimethylterephthalic acid, ethylterephthalic acid, methoxyterephthalic acid,
Examples thereof include alkyl, alkoxy or halogen substitution products of the above aromatic dicarboxylic acids represented by ethoxyterephthalic acid and the like.

Examples of the aromatic hydroxycarboxylic acid compound (B) include aromatic hydroxy such as 4-hydroxybenzoic acid, 3-hydroxybenzoic acid, 6-hydroxy-2-naphthoic acid and 6-hydroxy-1-naphthoic acid. Carboxylic acid, or 3-methyl-4-hydroxybenzoic acid, 3,
5-Dimethyl-4-hydroxybenzoic acid, 2,6-dimethyl-4-hydroxybenzoic acid, 3-methoxy-4-hydroxybenzoic acid, 3,5-dimethoxy-4-hydroxybenzoic acid, 6-hydroxy-5- Methyl-2-naphthoic acid, 6-hydroxy-5-methoxy-2-naphthoic acid, 2-chloro-4-hydroxybenzoic acid, 3-chloro-4-hydroxybenzoic acid, 2,3-dichloro-4-hydroxybenzoic acid Acid, 3,5-dichloro-4-hydroxybenzoic acid, 2,5-dichloro-4-hydroxybenzoic acid, 3-bromo-4-hydroxybenzoic acid, 6-hydroxy-5-chloro-2-naphthoic acid, 6 -Hydroxy-
7-chloro-2-naphthoic acid, 6-hydroxy-5,7
-Alkyl, alkoxy or halogen substitution products of aromatic hydroxycarboxylic acid such as dichloro-2-naphthoic acid.

As the aromatic diol (C), 4,4'-
Dihydroxybiphenyl, 3,3'-dihydroxybiphenyl, 4,4'-dihydroxyterphenyl, hydroquinone, resorcin, 2,6-naphthalenediol, 4,
4'-dihydroxydiphenyl ether, bis (4-hydroxyphenoxy) ethane, 3,3'-dihydroxydiphenyl ether, 1,6-naphthalenediol, 2,2-
Aromatic diols such as bis (4-hydroxyphenyl) propane and bis (4-hydroxyphenyl) methane, or chlorohydroquinone, methylhydroquinone, tert-
Butylhydroquinone, phenylhydroquinone, methoxyhydroquinone, phenoxyhydroquinone, 4-
Examples thereof include alkyl, alkoxy or halogen-substituted aromatic diols such as chlororesorcin and 4-methylresorcin.

Examples of (D ₁ ) aromatic dithiols include benzene-1,4-dithiol, benzene-1,3-dithiol, 2,6-naphthalene-dithiol, and 2,7-naphthalene-dithiol. Examples of (D ₂ ) aromatic thiophenol include 4-mercaptophenol, 3-mercaptophenol, and 6-mercaptophenol. Examples of (D ₃ ) aromatic thiol carboxylic acid include 4-mercaptobenzoic acid, 3-mercaptobenzoic acid, 6-mercapto-2-naphthoic acid and 7-mercapto-2-naphthoic acid.

(E) Aromatic hydroxylamine and aromatic diamine compounds include 4-aminophenol and N
-Methyl-4-aminophenol, 1,4-phenylenediamine, N-methyl-1,4-phenylenediamine,
N, N'-dimethyl-1,4-phenylenediamine, 3-
Aminophenol, 3-methyl-4-aminophen-
2-chloro-4-aminophenol, 4-amino-
1-naphthol, 4-amino-4'-hydroxybiphenyl, 4-amino-4'-hydroxydiphenyl ether, 4-amino-4'-hydroxydiphenylmethane,
4-amino-4′-hydroxydiphenyl sulfide,
4,4'-diaminophenyl sulfide (thiodianiline), 4,4 'diaminodiphenyl sulfone, 2,5-diaminotoluene, 4,4'-ethylene dianiline, 4,4'
-Diaminodiphenoxyethane, 4,4'-diaminodiphenylmethane (methylenedianiline), 4,4'-diaminodiphenylether (oxydianiline) and the like.

The thermotropic liquid crystal polymer used in the present invention can be produced from the above-mentioned monomers by various ester forming methods such as a melt acidolysis method and a slurry polymerization method.

The thermotropic liquid crystal polymer used in the present invention has a weight average molecular weight of about 2,000 to 200,000.
0, preferably about 4,000-100,000. The molecular weight can be measured, for example, by measuring the end groups of a compressed film by infrared spectroscopy. GPC can also be used as a general measuring method performed in the form of a solution.

Among the thermotropic liquid crystal polymers obtained from these monomers, the aromatic polyester which is a (co) polymer containing the monomer unit represented by the general formula 1 as an essential component is preferable. Particularly preferred is an aromatic polyester containing 5 mol% or more of the above monomer units.

[0017]

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One of the particularly preferred aromatic polyesters of the present invention is the polyester represented by Chemical Formula 2 having repeating units derived from three compounds, p-hydroxybenzoic acid, phthalic acid and dihydroxybiphenyl. The repeating units derived from dihydroxybiphenyl of this polyester can be partially or entirely substituted with repeating units derived from dihydroxybenzene. Further, the polyester represented by Chemical formula 3 having repeating units derived from two compounds of p-hydroxybenzoic acid and hydroxynaphthoic acid is also preferable.

[0019]

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The thermotropic liquid crystal polymer of the present invention can be used alone or as a mixture of two or more kinds.

The heat-resistant resin molded product used in the present invention may have any shape such as a plate-shaped body such as a film or a sheet, a columnar body such as a cylinder, and a hollow columnar body such as a hollow pipe. As the fixing roll, a hollow pipe-shaped molded body is preferably used. This hollow pipe can be molded by a conventionally known injection molding method or extrusion molding method. For example, in the case of a thermotropic liquid crystal polymer hollow pipe, in order to obtain a hollow pipe that is uniform and has high mechanical strength, the method described in WO 94/25243 of the applicant's earlier application. Is preferably used. Since the above-mentioned molded body supports the structure of the heat-generating laminated structure, it needs to have a certain thickness. Usually, this thickness is selected from the range of 0.1 to 50 mm.

In the present invention, the heating element layer is formed on the molded body made of heat resistant resin. Here, the heating element layer is
A layer formed of a material that generates heat by energization or microwave discharge. As the material for the heating element, a conventionally known single heating element, a heating complex, a circuitized metal vapor deposition thin film, or the like can be adopted. For example, nichrome etc. can be illustrated as a conventionally known single heating element. Examples of the exothermic composite include metals such as stainless steel, copper, nickel, iron, aluminum, chromium and cobalt; carbon; metal compounds such as TiO ₂ , SnO ₂ , ZnO ₂ or mixtures thereof; magnetic materials such as manganese. A resin dispersion obtained by dispersing fibers or powder in an appropriate resin can be exemplified. Furthermore, it is also possible to use a circuit-formed metal vapor deposition thin film as the heating element layer. Metals used for circuitization include gold, silver, aluminum, copper, nickel,
Examples include chromium, titanium, platinum, palladium, stainless steel, copper-zinc alloy, nichrome and the like. As described above, any material can be used without particular limitation as long as it is a material that generates heat by energization or microwave discharge.

As described above, when the heat generating laminated structure is used as a fixing roll, it is necessary to heat it to a high temperature of 200 ° C., and its power consumption varies depending on the size and shape of the heat generating laminated structure. However, about 100 to 300 W is required for a normal fixing roll. Therefore, when a commercial 100V power source is used, it is preferable to set the resistance value of the heating element layer to be 30 to 100Ω. Usually, the thickness of the heating element layer is 1 mm or less, preferably 500 μm or less.

The heating element layer is a molded body made of a heat resistant resin,
For example, it is formed on the outer surface of a hollow pipe or the like. As a forming method, a conventionally known method can be used. For example, when a raw material for a heating element is used as a raw material, examples of the method for forming a thin film from a solution include an electroless plating method, an electroplating method, and a polymer coating method. Examples thereof include a vacuum vapor deposition method and a sputtering method. In the case of using the vacuum deposition method, the sample of the heating element is evaporated by electric heating in a vacuum chamber at a pressure of 10 ⁻⁵ to 10 ⁻⁷ Torr,
A heating element layer is formed by fixing and laminating on the outer surface of a hollow pipe made of a heat resistant resin. Also, in the sputtering method, it is excited by an electron beam or discharge,
Alternatively, irradiate the surface of a solid sample, which is the raw material of the heating element, with an ionized noble gas (eg, argon), flick off the sample on the surface, and fix it to the outer surface of the hollow pipe made of heat-resistant resin and laminate it. To form a heating element layer. The electroless plating method is a method in which a metal salt is chemically reduced and a coating film is formed by depositing a reduced metal. The electroplating method is a method in which a conductive layer is used as an electrode and a metal electrically reduced from a solution of a metal salt is electrodeposited on the conductive layer. Often, electroless plating is performed and then electroplating is performed to form a thin film. The thin layer can be formed by any of the above methods.

When the heat-generating composite material is used as the material for the heat-generating body, a method such as coating or fusion-integration can be used. In the case of coating, for example, an electrically conductive powder and a fluororesin such as Teflon, or a suitable resin powder such as a silicone resin is dispersed in a suitable solvent to prepare a dispersion liquid, and the outer surface of a molded product made of a heat resistant resin. Apply to and dry.
In the case of fusion and integration, a hollow sheet of heat-resistant resin is spirally wound with a sheet of resin in which fibers or powders of an electric conductor are dispersed and mixed, and a heat-generating composite is fused and integrated by heat treatment. .

When a circuitized metal vapor-deposited thin film is used as the material for the heating element, the vapor-deposited thin film can be produced by the above-described vacuum vapor deposition method or sputtering method. The circuitization can be performed by a conventionally known process such as etching.

Alternatively, the heating element film may be adhered with an appropriate heat-resistant double-sided adhesive tape, adhesive or the like to form the heating element layer. When the heating element layer is heated by energization, an appropriate electrode terminal for connecting to a power source can be provided at an arbitrary position, for example, the end portion of the laminated body.

Next, an electric insulator layer is formed on the heating element layer. This electrical insulator layer has good electrical insulation properties,
It is a layer for electrically insulating the heating element layer, and is made of a material having a resistance value of 100 times or more the resistance value of the heating element layer. As long as this condition is satisfied, conventionally known materials can be used. For example, as the inorganic material, SiO ₂ , NaCl or the like can be exemplified. Examples of the organic material include heat resistant thermoplastic resins such as silicone resin, polyphenylene sulfide, polysulfone, wholly aromatic polyester, polyetherimide, polyetheretherketone, and heat shrinkable fluororesin. The thickness of the electrical insulator layer is sufficient if it gives a resistance value 100 times or more the resistance value of the heating element layer, and is usually 100 μm.
m or less, preferably 1 to 50 μm.

As the method for forming the electric insulator layer, the method described in the method for forming the heating element layer, that is, the vacuum deposition method of the inorganic material, the sputtering method, the coating of the heat resistant resin dispersion, and the fusion bonding of the heat resistant resin film are carried out. In addition to the integration, the double-sided adhesive tape of the heat-resistant resin film, the adhesion with an adhesive or the like, a vapor phase growth method, a vapor deposition polymerization method and the like can be used. In the vapor phase growth method, a raw material gas is introduced into a vacuum chamber, and light,
It is a method of producing an electric insulator and making it into a thin film in a state where it is activated energetically by heat or plasma.
The vapor deposition polymerization method is a method in which a monomer raw material is vapor-deposited on a substrate or the like which is heated to a high temperature in a vacuum chamber, and at the same time, polymerization is performed to form an electric insulator layer.

Further, in the present invention, a heat conductor layer is formed on the electric insulator layer. The heat conductor layer used here is for uniformly distributing the heat generated in the heat generating layer by good heat conduction, and has a heat conductivity of 5
It is formed using a material of 0 W · m ⁻¹ · K ⁻¹ or more. Any conventionally known material can be used as long as this condition is satisfied. For example, carbon fiber, gold, copper, silver, nickel,
An inorganic material having good heat conductivity and heat resistance such as TiN can be exemplified. The thickness of the heat conductor layer is sufficient as long as the temperature distribution of the laminate can be made uniform by heat conduction, and is usually 2 mm or less, preferably 1 mm or less.

The heat conductor layer is formed by the vacuum deposition method as described above,
Sputtering method, vapor phase growth method, vapor deposition polymerization method, method of applying heat resistant resin paint consisting of dispersion or solution of heat resistant resin, electroplating method, electroless plating method, fusion bonding method, or double-sided adhesive tape Alternatively, it can be formed by any method such as a method of adhering with an adhesive or the like. The heat conductor layer is electrically insulated from the heat generating layer by the interposition of the electric insulator layer.

The heating element layer, the electric insulator layer and the heat conductor layer are formed by the above-mentioned vacuum vapor deposition method, sputtering method, vapor phase growth method, vapor deposition polymerization method, polymer dispersion or solution. It is preferably formed by a method of applying a paint, a thin film coating method such as an electroplating method or an electroless plating method.

Although the heat-generating laminated structure of the present invention can be obtained by the above method, an appropriate protective layer can be provided on the heat conductor layer. For example, as a protective layer, an electrical insulator layer can be further formed on the heat conductor layer. The electric insulator layer used here is the same as the above-mentioned electric insulator layer. That is, it is a layer that electrically insulates the heating element layer due to good electrical insulation, and is made of a material having a resistance value of 100 times or more the resistance value of the heating element layer. The electrical insulator layer can be formed in the same manner as the method for forming the electrical insulator layer. The film thickness is also 100 times the resistance value of the heating element layer.
It is sufficient if the size gives a resistance value more than twice, and is usually 100 μm or less, preferably 1 to 50 μm.

The present invention will now be described with reference to the accompanying drawings. FIG. 1 is a schematic partial cross-sectional perspective view showing an embodiment of a heat generating laminated structure as a fixing roll. The heat-generating laminated structure 1 has, as a core material, a heat-resistant resin molded body 2 formed of a hollow pipe of wholly aromatic polyester, for example. A heating element layer 3 made of nichrome or the like is provided on the outer surface thereof, and a silicone resin coating material dissolved in an organic solvent, for example, is applied and dried to form the electrical insulator layer 4. Then, a heat conductor layer 5 made of, for example, copper or nickel is provided thereon. Further, as a preferable protective layer, a silicone resin coating material dissolved in an organic solvent is applied and dried, or a heat shrinkable fluorocarbon resin is wound in a roll and integrated by heat fusion to form a heat conductor layer 5.
An electric insulator layer 4a is formed on the above. Both ends of the heat generating laminated structure 1 are not covered with the electric insulator layer 4, the heat conductor layer 5 and the electric insulator layer 4a, and the heat generating layer 3 is exposed, and electrode portions for energization are provided in the exposed portions. Is provided.
It is important that the heat conductor layer 5 is electrically insulated from the heat generating layer 3.

[0035]

In the heat generating laminated structure of the present invention, the heat generating layer 3
When electricity is applied to the heating element layer 3, the heating element layer 3 generates heat, and the heat is transferred to the thermal conductor layer 5 via the electrical insulator layer 4 by thermal conduction. Since the heat conductor layer 5 has a larger thermal conductivity than the heat generator layer 3, the temperature variations generated in the heat conductor layer 3 are equalized in the heat conductor layer 5, resulting in a substantially uniform temperature distribution. . Since the heating element layer 3, the electric insulator layer 4 and the heat conductor layer 5 are thin films, the time required for the temperature rise is very short. Further, since the core material made of the heat resistant resin molded body 2 is used, it is lightweight. Furthermore, since the heat generating layer 3 and the heat conductor layer 5 are electrically insulated by the electric insulator layer 4, it is possible to form each using any material.

[0036]

EXAMPLES The present invention will be described in detail below with reference to examples. <Example 1> A quaternary copolyester having p-hydroxybenzoic acid, terephthalic acid, 4,4'-dihydroxybiphenyl and isophthalic acid as constitutional units as a heat-resistant thermoplastic synthetic resin and melting at 320 ° C or higher. A thermotropic liquid crystal polyester resin having a melt anisotropy at a temperature of 60% by weight and a glass fiber of 40% by weight were melt-kneaded by a twin-screw extruder (made by Ikegai Co., Ltd.). The outer surface of a hollow pipe (outer diameter 1 cm, inner diameter 0.6 cm, length 30 cm) obtained by molding the obtained resin composition by injection molding was coated with nichrome by a sputtering method to generate heat with a thickness of 100 nm. A body layer was formed.
A tape with weak adhesion was wrapped around both ends of the pipe. Next, a silicone resin paint (trade name: heat resistant spray, manufactured by Rock Paint Co., Ltd.) was applied onto nichrome and dried to form an electric insulator layer having a thickness of 10 μm. Nickel was coated thereon by both electroless plating and electroplating to form a heat conductor layer having a thickness of 300 μm. Further, the above-mentioned silicone resin coating material was applied and dried thereon in the same manner to form an electric insulator layer having a thickness of 10 μm to obtain a heat generating laminated structure. Finally, the tape wound around both ends of the heat-generating laminated structure was removed to expose the nichrome layer, and electrode terminals for energization were provided on both ends of the layer to complete the fixing roll. The evaluation of the temperature variation of the heat-generating laminated structure as the fixing roll is performed by thermography (trade name: T
VS-120, manufactured by Nippon Avionics Co., Ltd.). At the time of evaluation, a black body radiation coating material was applied to the surface of the heat-generating laminated structure and dried. Commercial 1 at both ends of the heating laminated structure
When energized with a voltage of 00V, 200 ° C for 10 seconds
And the temperature variation was 2 ° C. or less. That is, according to the present embodiment, it is possible to manufacture a heat generating laminated structure as a small and lightweight fixing roll, in which the temperature rises quickly and the temperature hardly varies.

Example 2 Nichrome was coated on the outer surface of the same hollow pipe as that used in Example 1 by a sputtering method to form a heating element layer having a thickness of 100 nm. A tape with weak adhesion was wrapped around both ends of the pipe. The same silicone resin paint used in Example 1 was applied onto nichrome and dried to a thickness of 10 μm.
m electrical insulator layer was formed. Copper was coated thereon by a combination of electroless plating and electroplating to form a heat conductor layer having a thickness of 200 μm. Further, the above-mentioned silicone resin coating material was applied and dried thereon in the same manner to form an electric insulator layer having a thickness of 10 μm to obtain a heat generating laminated structure. Finally, the tape wound around both ends of the heat-generating laminated structure was removed to expose the nichrome layer, and electrode terminals for energization were provided on both ends of the layer to complete the fixing roll.
The temperature variation of the heat-generating laminated structure as a fixing roll was evaluated by the thermography used in Example 1. At the time of evaluation, a blackbody radiation coating material was applied to the surface of the heat-generating laminated structure and dried. Commercial 1 at both ends of the heating laminated structure
When energized with a voltage of 00V, 200 ° C for 10 seconds
And the temperature variation was 2 ° C. or less. That is, according to the present embodiment, it is possible to manufacture a heat generating laminated structure as a small and lightweight fixing roll, in which the temperature rises quickly and the temperature hardly varies.

[0038]

As described above, according to the present invention, it is possible to provide a heat-generating laminated structure which has a rapid temperature rise, is capable of uniform heating, is small in size and is lightweight, and has a long life. Further, since it has an electric insulator layer for electrically insulating the heat generating layer and the heat conducting layer, the electric insulating property is good. Therefore, any material can be used as the heat generating layer or the heat conducting layer. It is possible to select.

[Brief description of drawings]

FIG. 1 is a schematic partial cross-sectional perspective view of an embodiment of a heat generating laminated structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat-generating laminated structure 2 Heat-resistant resin molded body 3 Heat-generating body layer 4, 4a Electric insulator layer 5 Heat conductor layer

Claims (4)

[Claims] 1. A heating element layer on the outer surface of the heat-resistant resin molding,
A heat-generating laminated structure having an electrical insulator layer and a heat conductor layer formed in this order. 2. The heat-generating laminated structure according to claim 1, wherein the heat-resistant resin molding is a hollow pipe. 3. The heat generating laminated structure according to claim 1, wherein the heat generating layer, the electric insulator layer and the heat conductor layer are formed by thin film coating. 4. The heat-generating laminated structure according to claim 1, wherein the heat-resistant resin is a thermotropic liquid crystal polymer.