JPH1116663A - Heating element and hair set unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating element, which can securely control temperature thereof so as to evenly heat at a desirable temperature and which can hold the shape thereof, by providing electrifying parts, which includes the powdery conductive material and which have positive temperature coefficient characteristic and which is made of resin, in both sides of a heating part in nearly parallel with each other in the vertical direction of the heating surface. SOLUTION: A powdery conductive material having conductivity such as carbon is included in the resin material having a large coefficient of positive temperature such as PE so as to obtain a heating part having a self temperature control function. As a heating part, a heating part, which shows resistivity change ratio at 10 times or more between the using maximum temperature and the using maximum temperature +5C in a using temperature area, is desirably used. At least one pair of electrifying parts 2, 3 for electrifying this heating part 1 are provided so as to form a heating element A. At this stage, the electrifying parts 2, 3 are formed in both sides of the heating part 1 in nearly parallel with each other of the heating element A, and a distance between them is always maintained constant, and furthermore, mechanical strength of the electrifying parts 2, 3 is set larger than that of the heating part 1, and rugged parts are desirably formed so as to prevent the generation of peeling from the heating part 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating element having a self-temperature control function for generating heat so as to maintain a predetermined temperature when energized.

[0002]

2. Description of the Related Art Various types of heating elements having a self-temperature control function have been proposed. FIG. 41 shows an example of such a heating element A as disclosed in JP-A-8-106971.
1 shows a planar heating element described in Japanese Patent Application Laid-Open Publication No. H10-26095. This planar heating element
An exothermic composition (resin material) having a thermoplastic resin (synthetic resin) and conductive particles (a resin material) is formed into a planar shape. The configuration is such that the current-carrying portions (covered wires) 2 and 3 formed by the group 21 are arranged at predetermined intervals from each other.

The heat generating portion 1 of the heat generating member A is formed of a resin material having a self-temperature control function. As shown in FIGS. 42 (a) and 42 (b), this resin material is made of a powdered conductive material 22 having an average particle size of about 10 to 200 nm, such as iron, aluminum, copper, or carbon. And the like. In the heating element A, when electricity is supplied to the heating section 1 from the pair of current-carrying sections 2 and 3, the connection state of the conductive substance 22 in the synthetic resin 23 is high as shown in FIG. The resistance value is small and a large current flows, and the amount of heat generated by the heat generating portion 1 increases, generating heat.

When the heat generating portion 1 generates heat as described above, the synthetic resin 23 expands due to the heat and the bonding state of the conductive substance 22 in the synthetic resin 23 is partially cut off as shown in FIG. Due to the coarseness, the resistance value of the heat generating portion 1 increases, and it becomes difficult for current to flow, and the heat generation amount of the heat generating portion 1 decreases, thereby suppressing heat generation. When the heat generation of the heat generating portion 1 is suppressed as described above, the synthetic resin 23 contracts, and the bonding state of the conductive substance 22 in the synthetic resin 23 becomes dense as shown in FIG.

In other words, as shown in the graph of FIG. 43 and Table 1, when the temperature of the heating section 1 increases, the resistance value R (curve A in FIG. 43) of the heating element A increases, and the flow rate of the current decreases. When the temperature of the heat generating portion 1 decreases, the resistance value R decreases, the current flow increases, and the heat value W increases. The self-temperature is controlled by a repeating mechanism.

[0006]

[Table 1]

[0007]

SUMMARY OF THE INVENTION Here, the conventional example is described.
The heat generation of the heat body A will be described using a hypothetical model. The conventional example
If the distance between the conducting parts 2 and 3 is long as in the case of the heating element A,
44, a plurality of resistors RA and RB are connected in series
It can be explained by a series model. Energizing part 2,
3 when the current V flows through the heating part 1 by applying the voltage V during
In this case, the voltages VA and VB generated by the respective resistors RA and RB are VA
= I × RA = (RA × V) / (RA + RB), VB = i
× RB = (RB × V) / (RA + RB) Departure
Q = V^Two/ R, each resistor RA, R
The calorific values QA and QB generated in B are represented by QA = (RA × V^Two)
/ (RA^Two+ 2 × RA × RB + RB^Two), QB = (RB
× V ^Two) / (RA^Two+ 2 × RA × RB + RB^Two)
It is. Accordingly, the resistance values of the resistors RA and RB are set to satisfy RA> RB.
If there is such a difference, the heating values QA, QB of the resistors RA, RB
QA> QB, and the temperature distribution (temperature
Will occur.

More specifically, in the heating element A having such a configuration, the resistance value (logarithmic representation of resistivity) of the heating portion 1 (a resin material having a positive temperature coefficient characteristic) as shown in FIG. In a low temperature range TL where R does not change abruptly with temperature (a temperature range in which the rate of change of the resistance value R within the operating temperature range of the heating unit 1 is less than 10 times), the ambient temperature of the heating element A (the outer peripheral portion has heat radiation or the like). (E) even if the ambient temperature of the heating element A is slightly changed, as shown in FIG. The value (resistivity) R does not change much), and the heating value Q does not change much as shown in FIG. 45 (f), so that the temperature T of the heating element A is kept almost uniform as shown in FIG. 45 (d). . However, since a region where the resistance value R of the heat generating portion 1 (resin material having a positive temperature coefficient characteristic) does not rapidly change with temperature is used, when the ambient temperature, the applied voltage, and the like change, the heat generating member A The temperature also changes and cannot be controlled to a constant temperature.

On the other hand, as shown in FIG. 46 (a), the resistance value R of the heat generating portion 1 (resin material having a positive temperature coefficient characteristic) rapidly changes with temperature in a high temperature region TH (within the operating temperature region of the heat generating portion 1). Is used in a temperature range in which the rate of change of the resistance value R is 10 times or more, the resistance value R of the heating element A is affected by the ambient temperature of the heating element A (if the temperature is low due to heat radiation or the like in the outer peripheral portion). Therefore, (if the ambient temperature of the heating element A changes slightly from FIG. 46A, the resistance value R greatly changes as shown in FIG. 46E), and the heat generation amount Q as shown in FIG. The temperature T of the heating element A is also greatly changed, and only the central portion generates heat and the end portion does not generate heat, and it becomes difficult to uniformly generate heat as shown in FIG. However, only the central part can be controlled to a constant temperature even when the ambient temperature, the applied voltage, and the like change. Note that X in FIG. 45 and FIG.
FIG. 47B shows the displacement position in the CC section of FIG. 46B.

That is, in the heating element A of the prior art, since the heating portion 1 has a positive temperature coefficient characteristic, the resistance value is determined at the temperature of a certain portion of the heating portion 1, so that the current-carrying portion This means that the heat generating portions 1 between a few have partially different resistance values. At that time, the value of the current flowing between the current-carrying parts 2 and 3 is determined at the place where the resistance value is the highest, so that the place where the resistance value is high generates heat and the place where the resistance value is low does not generate much heat. In the state where heat is generated, since the outer peripheral portion is cooled by the influence of heat radiation, the central portion between the conducting portions 2 and 3 of the heat generating portion 1 generates heat, and the end portion does not generate much heat.
There was a problem that the entire body could not be uniformly heated. Further, when used in a low temperature range, there is a problem that the temperature cannot be controlled to a desired temperature due to the influence of the fluctuation of the ambient temperature or the applied voltage.

The heating section 1 is made of synthetic resin 2 as described above.
3 utilizing the thermal expansion of the synthetic resin 23
(Thermoplastic resin) The thermal expansion is large from about 20 ° C. lower than the melting point, and the resistance value also rises sharply.
However, the mechanical properties such as the bending strength of the heat generating portion 1 are deteriorated, and it is difficult to maintain the shape of the heat generating portion 1. Further, when the rate of change of the resistance value of the heat generating portion 1 in a range where the temperature is to be controlled is low (a positive temperature characteristic can be said if it has a slight positive slope), it cannot be controlled to a desired temperature. There was a problem. In addition, there is a problem that the entire unit cannot be uniformly heated depending on the relationship between the distances and positions of the conducting units 2 and 3.

Further, the heat generating portion 1 utilizes the thermal expansion of the synthetic resin 23 as described above. However, when the current-carrying portions 2 and 3 are rigid bodies having strength, the thermal expansion of the synthetic resin 23 is reduced. There is a problem in that the temperature control is restricted, and the positive temperature characteristic is hardly obtained, and the temperature control is restricted. Further, since the thermal expansion coefficient of the heat generating portion 1 is different from that of the conductive portions 2 and 3, if the device is used repeatedly for a long time, partial peeling occurs at the interface between the heat generating portion 1 and the conductive portions 2 and 3. There is a problem that it is not possible to uniformly supply heat to the heat generating unit 1 and it is not possible to generate heat evenly. In the worst case, the connection between the heat generating unit 1 and the power supply units 2 and 3 is cut off and power is supplied. There is a possibility that heat generation may not be possible and heat may not be generated, or the current-carrying parts 2 and 3 may come into contact with each other to cause a short-circuit and fire.

Further, in order to make the entire body generate heat uniformly,
The distance between the pair of energizing sections 2 and 3 may be shortened and disposed over the entire heat generating section 1. However, if the distance between the energizing sections 2 and 3 is shortened, the space between the energizing sections 2 and 3 is reduced. Electric discharge occurred, and there was a possibility that the heat generating portion 1 was carbonized at that portion and short-circuited, making it impossible to use. When the distance between the conducting parts 2 and 3 is reduced, the conducting parts 2 and 3 move or deform when the heat generating part is formed, and the conducting parts 2 and 3 come into contact with each other and short-circuit. There was a risk that I could not do it. Further, the mechanical strength of the heat-generating part 1 and the current-carrying parts 2 and 3 is reduced due to heat in the actual use state. As a result, the current-carrying parts 2 and 3 are moved or deformed by external force. There was a risk that the three would come into contact with each other and short-circuit, making it impossible to use them.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it is possible to reliably perform temperature control, control a desired temperature, uniformly generate heat, and control temperature control. Can be unconstrained,
It is an object of the present invention to provide a heating element capable of maintaining a shape and preventing a short circuit due to contact between current-carrying portions.

[0015]

According to the first aspect of the present invention, there is provided a heating element which comprises a heating element formed of a resin material having a positive temperature coefficient characteristic and containing a powdery conductive substance having conductivity. 1 and at least a pair of conducting parts 2 and 3 for conducting electricity to the heating part 1, the heating part 1 is sandwiched in a direction perpendicular to a surface where the conducting parts 2 and 3 are to be heated. It is characterized by being provided substantially in parallel.

A heating element A according to a second aspect of the present invention includes a heating section 1 made of a resin material containing a powdery conductive material having conductivity and having a positive temperature coefficient characteristic;
A heating element formed by including at least a pair of current-carrying portions 2 and 3 for supplying current to the heat-generating portions 2 and 3, provided substantially in parallel with the heat-generating portion 1 in a direction perpendicular to a surface on which heat is to be generated;
The present invention is characterized in that the current-carrying portions 2 and 3 are formed of a resin material containing a powdery conductive substance having conductivity.

The heating element A according to claim 3 of the present invention.
Is a configuration in which, in addition to the configuration of claim 1 or 2,
Is characterized by having a higher mechanical strength than the heat generating portion 1 when heat is generated. Further, in the heating element A according to claim 4 of the present invention, in addition to the configuration according to any one of claims 1 to 3, the heating section 1 has a change rate of the resistance value of 10 times or more in a use temperature range. , And the maximum operating temperature and the maximum operating temperature +
It is characterized by having a resistance change rate of 10 times or more between 5 ° C.

The heating element A according to claim 5 of the present invention.
Is characterized in that, in addition to any one of the first to fourth aspects, the distance between the pair of conducting parts 2 and 3 is always constant. A heating element A according to a sixth aspect of the present invention, in addition to the configuration according to any one of the first to fifth aspects, further includes a separation preventing means 4 between the heating part 1 and the conducting parts 2 and 3.
Is provided.

The heating element A according to claim 7 of the present invention.
According to a sixth aspect of the present invention, in addition to the configuration of the sixth aspect, as the peeling preventing means 4, an engaging portion 5 having a concave and convex shape is formed on the conducting portions 2 and 3. Further, the heating element A according to claim 8 of the present invention is characterized in that, in addition to the structure of claim 6 or 7, the holding section 6 having an uneven shape is formed on the heating section 1 as the separation preventing means 4. It is assumed that.

The heating element A according to the ninth aspect of the present invention has a positive temperature coefficient characteristic in addition to the constitution according to any one of the first to eighth aspects, further comprising a powdery conductive substance having conductivity. It is characterized by comprising a heat generating portion 1 formed of a resin material, and at least a pair of flexible current-carrying portions 2 and 3 for energizing the heat generating portion 1. The heating element A according to a tenth aspect of the present invention has the structure according to the ninth aspect,
The current-carrying portions 2 and 3 are conductors such as stranded wires and mesh wires,
It is characterized by having elasticity.

The heating element A according to claim 11 of the present invention.
According to the present invention, in addition to the configuration of the ninth aspect, the energizing portions 2 and 3 are corrugated or coiled conductors and have elasticity. A heating element A according to a twelfth aspect of the present invention has the unevenness for preventing the conductive parts 2 and 3 from peeling off from the heating part 1 in addition to any one of the ninth to eleventh aspects. It is characterized by being provided with a peeling prevention part 14.

The heating element A according to claim 13 of the present invention.
According to the ninth aspect, in addition to the configuration of the ninth aspect, the current-carrying portions 2 and 3 are formed of a conductive paint and have elasticity. The heating element A according to claim 14 of the present invention.
Is characterized in that, in addition to the configuration according to any one of the first to thirteenth aspects, the energizing units 2 and 3 are provided other than the outer peripheral portion of the surface of the heat generating unit 1 where heat is to be generated.

The heating element A according to claim 15 of the present invention.
In addition to the configuration according to any one of claims 1 to 14, a contact preventing means 7 for preventing contact between the conducting parts 2 and 3 is provided between the conducting parts 2 and 3, and the softening point and the heat distortion temperature are provided. , Wherein at least one of the melting points is made of an insulating material higher than the heat generating portion 1 to form the contact preventing means 7.

The heating element A according to claim 16 of the present invention.
Is characterized in that, in addition to the configuration of claim 15, the contact preventing means 7 is constituted by a plurality of insulators 8. A heating element A according to a seventeenth aspect of the present invention is characterized in that, in addition to the configuration of the fifteenth aspect, the contact preventing means 7 is constituted by a single insulator 8.

The heating element A according to claim 18 of the present invention.
Is characterized in that, in addition to the configuration of any one of claims 15 to 17, the contact preventing means 7 is formed of a continuous porous body 15. Claim 19 of the present invention
The heating element A according to the above aspect, in addition to the configuration according to any one of claims 15 to 18, wherein the contact preventing means 7 is formed by a grid body 10 having a through hole 9 in a direction between the conducting parts 2 and 3. It is characterized by the following.

The heating element A according to claim 20 of the present invention.
In addition to the constitution of claim 1 or 2, the heat generating portion 1 has a rate of change of the resistance value which is twice or more in the operating temperature range, and the heat generating portion 1 has a resistance between the maximum operating temperature and the maximum operating temperature + 10 ° C. It is characterized by having a resistance change rate of up to 20 times. A heating element A according to a twenty-first aspect of the present invention is configured such that, in addition to the configuration according to any one of the first to twentieth aspects, the heating part 1 and the conducting parts 2 and 3 are formed of the same synthetic resin material. It is characterized by the following.

The heating element A according to claim 22 of the present invention.
Is characterized in that, in addition to the configuration of any one of claims 1 to 21, the heat generating portion 1 and the conducting portions 2, 3 are formed of a material having substantially the same linear expansion coefficient.
Further, the heating element A according to claim 23 of the present invention is characterized by claim 1
In addition to any one of the above-described structures, the distance between the pair of conducting portions 2 and 3 is changed depending on the location of the heat generating portion 1.

The hair setting device B according to claim 24 of the present invention is a heating element A according to any one of claims 1 to 23.
Is characterized by using the following.

[0029]

Embodiments of the present invention will be described below. FIG. 1 shows an example of an embodiment of a heating element A of the present invention. The heating element A includes a heating section 1 formed of a resin material having the same positive temperature coefficient characteristics as the conventional example, and a heating section 1.
And a pair of current-carrying parts 2 and 3 for energizing the battery. The heat generating portion 1 is formed in a thin plate (sheet shape) having a certain width and thickness, and is formed of a resin material prepared by containing a powdery conductive material having conductivity in a resin. ing.

As the conductive material in the form of powder, iron, aluminum, copper, carbon (carbon black) and the like can be used, but in consideration of the heat generation properties of the heat generating portion 1, workability, durability and the like. It is preferable to use carbon. The resin constituting the heat generating portion 1 is made of a polyolefin resin, for example, a thermoplastic crystalline resin such as polypropylene or polyethylene, or the like, and has a positive temperature coefficient (PTC).
Polyamide resin, polyacetal resin, PBT (polybutylene terephthalate) resin, PET (polyethylene terephthalate) resin, PPS (polyphenylene sulfide) resin, phenolic resin, epoxy resin Etc.
These may be used alone or may be used by blending. Then, a resin material for forming the heat generating portion 1 is prepared by mixing the conductive material and the resin.

The energizing sections 2 and 3 are provided in parallel with the heating section 1 in a direction perpendicular to the surface of the heating section 1 where heat is to be generated. That is, the conducting portions 2 and 3 are provided in parallel with each surface (front and back surfaces) in the thickness direction of the heat generating portion 1 with the heat generating portion 1 interposed therebetween, and are formed in contact with the entire surface of each surface. There is no particular limitation on the material constituting the current-carrying portions 2 and 3 as long as it is a material that conducts electricity. The current-carrying parts 2 and 3 are heated when the heat is generated.
It is preferable that the material has a higher mechanical strength than that of the above (claim 3). By forming the current-carrying portions 2 and 3 so as to have higher mechanical strength than the heat-generating portion 1 during heat generation, even if the heat-generating portion 1 becomes soft at the time of heat generation and cannot maintain its own shape. In addition, the shape of the heat generating portion 1 can be maintained by the energizing portions 2 and 3 so that the shape does not collapse.

Specifically, copper, copper alloys, iron, stainless steel, or those subjected to a surface treatment such as nickel plating or tin plating, aluminum, nickel, silver,
It can be formed of a metal such as gold, iron or iron subjected to a surface treatment such as plating, or a stainless steel plate. In addition, the shape of the conducting portions 2 and 3 can be formed in a thin plate shape, a single wire shape, a stranded wire obtained by twisting a plurality of single wires, a mesh wire obtained by knitting a plurality of single wires, or the like. Alternatively, the conductive portions 2 and 3 may be formed of a conductive resin prepared by dispersing particles of a metal such as iron or carbon in a resin or the like, or a conductive paint obtained by diluting the conductive resin with a solvent. Good.

As a method of forming the heating element A, that is, a method of fixing the current-carrying portions 2 and 3 to the heat-generating portion 1, a method of extruding the heat-generating portion 1 together with the current-carrying portions 2 and 3 when extruding the heat-generating portion 1; A method for insert-molding the current-carrying parts 2 and 3 when injection-molding the part 1, a method for insert-molding the heat-generating part 1 when injection-molding the current-carrying parts 2 and 3, Method of simultaneous injection molding in a mold, heating part 1
A method of inserting and forming the current-carrying parts 2 and 3 when press-molding, a method of inserting and forming the heat-generating part 1 when press-forming the current-carrying parts 2 and 3, Method of press-forming simultaneously in a mold, heating part 1
, By heating the conductive parts 2 and 3 by a hot press, forming the conductive parts 2 and 3 by an arbitrary method, and then fusing the heat generating part 1 by a hot press. Is formed by an arbitrary method and then the current-carrying portions 2 and 3 are bonded with a conductive adhesive. The heat-generating portion 1 is formed by an arbitrary method and then the current-carrying portions 2 and 3 are added by plating, vapor deposition, or the like. After forming the part 1 by an arbitrary method, a method of applying a conductive paint to form the conducting parts 2 and 3 can be exemplified.

In the heating element A, the energizing sections 2 and 3 are connected to the heating section 1.
Is provided in parallel with the heat generating portion 1 in the vertical direction of the surface on which heat is to be generated, so that the distance between the current-carrying portions 2 and 3 can be kept short and constant. Even if the outer peripheral portion is cooled by the influence, the entire surface to be heated can be uniformly heated, and the temperature can be controlled to be constant even when the ambient temperature, the applied voltage, and the like change.

Here, the heat generation of the heating element A of the present invention is assumed to be a hypothetical model.
To explain. Like the heating element A, between the conducting parts 2 and 3
When the distance is short, as shown in FIG.
A, RB to be described in parallel model connected in parallel
Can be. Q = V^Two/ R
The heat values QA and QB generated by the resistors RA and RB are represented by QA = V
^Two/ RA, QB = V^Two/ RB. Therefore, convection
When the resistance value of the resistor RA increases due to the influence of (heat radiation), heat is generated.
The quantity QA becomes smaller, and the resistance value of the resistor RB becomes larger.
Then, the calorific value QB becomes small, and
The control can be performed on the stand, and the temperature distribution (temperature variation)
C) does not occur.

More specifically, in the heating element A having such a configuration, the resistance value of the heating portion 1 (a resin material having a positive temperature coefficient characteristic) does not rapidly change with temperature. The rate of change of the resistance value within the temperature range is 10
In the temperature range of less than twice, the resistance value of the heating element is not affected by the ambient temperature of the heating element A (even if the outer peripheral part is low due to heat radiation or the like) (the ambient temperature of the heating element slightly varies). Also, the resistance value does not change much), and the calorific value does not change much, so that the temperature of the heating element is kept almost uniform. In addition, when the ambient temperature, the applied voltage, etc. change, the heating element A
Even if the temperature changes, it can be controlled to a constant temperature.

On the other hand, as shown in FIG. 3A, the resistance value (logarithmic representation of the resistivity) R of the heat generating portion 1 (resin material having a positive temperature coefficient characteristic) rapidly changes with temperature in a high temperature region TH (heat generating portion). In the case where the heating element A is used in the temperature range where the rate of change of the resistance value R within the operating temperature range of 10 is 10 times or more), the heating element
3 (a), the resistance value (resistivity) R greatly changes as shown in FIG. 3 (e) if the ambient temperature of the heating element A slightly changes as shown in FIG. 3 (a). Since the calorific value Q of the heat generating portion 1 is independently controlled at each location (the temperature T changes in the thickness direction in the BB section as shown in FIG.
The surface temperature of the heat generating portion 1 becomes constant), and heat can be generated uniformly as shown in FIG.
Even when the applied voltage or the like changes, the temperature can be controlled to a constant temperature T as shown in FIG. Note that X in FIG. 3 indicates a displacement position in the CC section of FIG.
Y in FIG. 3 indicates a displacement position in the BB cross section of FIG.

FIG. 4 shows another embodiment of the heating element A according to the first aspect. In the heating element A, the heating portion 1 is formed in a cylindrical shape having a certain thickness, and one energizing portion 2 is provided on the entire inner peripheral surface of the heating portion 1 and the other energizing portion 3 is provided on the entire outer peripheral surface of the heating portion 1. Are formed. Therefore, the distance L1 between the conducting parts 2 and 3 corresponds to the thickness of the heat generating part 1 and is always formed to be constant over the entire surface of the conducting parts 2 and 3. In this heating element A, the surface of the heating portion 1 where heat is to be generated is the outer peripheral surface.

FIG. 5 shows another embodiment of the heating element A according to the first aspect. This heating element A is formed by dividing the one shown in FIG. 4 in the radial direction substantially into two parts. The heating part 1 is formed in a substantially semicircular cylindrical shape having a substantially semicircular cross section and a constant thickness. One energizing section 2 is formed on the entire inner peripheral surface of the section 1, and the other energizing section 3 is formed on the entire outer peripheral surface of the heat generating section 1. Therefore, the distance L1 between the conducting parts 2 and 3 corresponds to the thickness of the heat generating part 1 and is always formed to be constant over the entire surface of the conducting parts 2 and 3. In this heating element A, the surface of the heating portion 1 where heat is to be generated is the outer peripheral surface.

In the heating element A, the heat generating portion 1 has a resistance change rate of 10 times or more in the operating temperature range and a resistance value of 10 times or more between the maximum operating temperature and the maximum operating temperature + 5 ° C. It is possible to set the type and content of the resin material and the conductive substance of the heat generating portion 1, the shape of the heat generating portion 1, the material and the shape of the current-carrying portions 2 and 3, etc. so as to have a change rate of 4). That is, the lowest use temperature in the use temperature range of the heat generating portion 1 (the range of the arrow C in FIG. 6) is T1 (° C.), the resistance value at that time is Ra (Ω), and the highest use temperature in the use temperature range is When T2 (° C.), the resistance value at that time is Rb (Ω), and the resistance value at the maximum use temperature T2 + 5 ° C. is Rc (Ω) (the graph is logarithmic), as shown by the curve d in FIG. / Ra
The heat-generating portion 1 is formed so as to have characteristics satisfying> 10 and Rc / Rb> 10. If the characteristics of the heating section 1 are Rb / Ra> 10 and Rc / Rb> 10, the temperature of the heating section 1 (heating element A) is kept within the operating temperature range even when the applied voltage or the operating environment temperature changes. It can be controlled and is safe.

Incidentally, the characteristics of the heat generating portion 1 are Rb / Ra> 10,
If Rc / Rb> 10, the effect of controlling the temperature of the heating part 1 (heating element A) within the operating temperature range is derived from the experimental results. For example, when T2 is 120 Rb / R with resin material around ℃
In the case where the heat generating portion 1 was formed so that a> 10 and Rc / Rb> 10, the temperature variation maintained an approximately constant value of ± 2 ° C. at an applied voltage of 100 ± 20 V and an ambient temperature of 0 to 50 ° C. However, when the heat generating portion 1 was formed so that Rb / Ra ≒ 5 and Rc / Rb ≒ 2, the temperature could not be controlled to a constant value.

FIG. 7 shows an embodiment of the heating element A according to the fifth aspect. The heating element A is formed such that the distance L1 between the conducting parts 2 and 3 is always constant. That is, the energizing portion 2 is provided over the entire surface on one surface (upper surface) of the heat generating portion 1 formed to have a constant thickness L1, and the energizing portion 3 is formed on the other surface (lower surface) of the heat generating portion 1 over the entire surface. Provided, heating part 1
Are formed in parallel with the conducting parts 2 and 3 interposed therebetween. Therefore, the distance L1 is formed to be constant over the entire surface between the conducting parts 2 and 3. In the heating element A, since the distance L1 between the power supply units 2 and 3 is always constant, the heat generation unit 1 and the power supply units 2 and 3 can always generate heat uniformly. Can be controlled to a constant temperature by uniformly generating heat.

FIG. 8 shows an embodiment of the heating element A according to the sixth aspect. The heating element A in FIG.
It is formed by providing the separation preventing means 4 over the entire surface between the heat generating part 1 and the conducting parts 2, 3. Therefore, the heating part 1 and the conducting parts 2, 3 are firmly fixed by the separation preventing means 4. It can be bonded so that even if the heat generating portion 1 repeats thermal expansion and contraction due to long-term use, partial separation does not occur at the interface between the heat generating portion 1 and the conducting portions 2 and 3. Therefore, in the heating element A, the current-carrying parts 2 and 3 can uniformly supply electricity to the heat-generating part 1 and generate heat uniformly, and the connection between the heat-generating part 1 and the current-carrying parts 2 and 3 is disconnected. It is possible to prevent the problem that the power cannot be supplied and the heat cannot be generated,
Further, it is possible to prevent the problem that the current-carrying parts 2 and 3 come into contact with each other and short-circuit and cause fire.

FIG. 9 shows an example of the separation preventing means 4.
The peeling prevention means 4 is composed of a locking portion 5 having a corrugated shape formed on the back surfaces of the conducting portions 2 and 3 and a fitting portion 37 having a concavo-convex shape formed on the surface of the heat generating portion 1. (Claim 7). The engaging portion 5 includes a concave engaging portion 5a and a convex engaging portion 5b, and the fitting portion 37 includes a concave fitting portion 37a and a convex fitting portion 3a.
7b. And the concave locking portion 5a
To the convex fitting portion 37b, and the convex locking portion 5b to the concave fitting portion 3.
By inserting and locking each of the heating elements 7a, the heating element A in which the current-carrying sections 2 and 3 are integrated with the heating section 1 can be formed.

FIG. 10 shows another example of the peeling preventing means 4. In the peeling preventing means 4 shown in FIG. 7, the convex locking portion 5b of the locking portion 5 is formed in an undercut shape having a substantially trapezoidal cross section, and the concave fitting portion 37a of the fitting portion 37 is formed in a convex shape. It is formed in an undercut shape having a substantially trapezoidal cross section corresponding to the shape of the stop portion 5b.
7b is formed in an undercut shape having a substantially trapezoidal cross section, and the concave locking portion 5a of the locking portion 5 is formed in an undercut shape having a substantially trapezoidal cross section corresponding to the shape of the convex fitting portion 37b. . In the heating element A, the engagement between the locking portion 5 and the fitting portion 37 becomes stronger than that in FIG.
And separation of the current-carrying portions 2 and 3 can be further prevented.

FIG. 11 shows another example of the peeling preventing means 4. The heating element A has a large number of convex holding sections 6 formed on the surface of the heating section 1 as the peeling prevention means 4.
And a large number of through holes 40 formed therein. The holding portion 6 is inserted into the through hole 40 from the back side of the conducting portions 2 and 3 and is locked at the opening edge portion on the front surface side of the through hole 40, so that the conducting portions 2 and 3 are integrated with the heat generating portion 1. The heating element A can be formed.

FIG. 12 shows an embodiment of the heating element A according to claim 9. This heating element A is formed in the same manner as the heating element A of claim 1 shown in FIG. 1 and the like, except for the energization sections 2 and 3, but the energization sections 2 and 3 are formed to have flexibility. I have. In the heating element A, since the current-carrying parts 2 and 3 having flexibility are used, the heat-expanding parts 2 and 3 follow the heat-expansion of the heat-generating part 1 so that the thermal expansion of the heat-generating part 1 is applied to the current-carrying parts 2 and 3. The self-temperature control function can be accurately performed by accurately exhibiting the positive temperature characteristic. As the flexible current-carrying portions 2 and 3, a conductive resin plate, a metal plate, a conductor stranded wire or a mesh wire formed of a metal wire such as a copper wire, a stainless steel wire, or a steel wire can be used. Further, corrugated or coiled conductors can be used for the flexible conducting portions 2 and 3. In addition, flexible energizing parts 2, 3
Can be formed of a conductive paint.

FIG. 13 shows an embodiment of the heating element A according to the tenth aspect. The heating element A uses a stranded wire formed by twisting a large number of metal wires 41 or a mesh wire formed by knitting a large number of metal wires as the conductive portions 2 and 3 having flexibility. The lower half of the current-carrying sections 2 and 3 is disposed so as to be embedded in the heat-generating section 1. In addition, this energizing part 2,
Since 3 is formed of a stranded wire or a mesh wire, it has elasticity in its longitudinal direction and its transverse direction. In the heating element A, since the current-carrying portions 2 and 3 having flexibility and elasticity are used, the heat-expanding portions 2 and 3 follow the thermal expansion of the heat-generating portion 1 so that the thermal expansion of the heat-generating portion 1 is controlled by the current-carrying portion. The self-temperature control function can be accurately performed by accurately exhibiting the positive temperature characteristic.

FIG. 14 shows an embodiment of the heating element A according to the eleventh aspect. This heating element A is formed by forming flexible conductive sections 2 and 3 as a single conductive body such as a metal plate bent in a vertical corrugated shape. Is disposed so as to face the surface. Further, since the current-carrying portions 2 and 3 are formed in a corrugated shape, they have elasticity in their longitudinal and transverse directions. In the heating element A, since the current-carrying portions 2 and 3 having flexibility and elasticity are used, the heat-expanding portions 2 and 3 follow the thermal expansion of the heat-generating portion 1 so that the thermal expansion of the heat-generating portion 1 is controlled by the current-carrying portion. The self-temperature control function can be accurately performed by accurately exhibiting the positive temperature characteristic.

FIG. 15 shows another embodiment of the heating element A according to the eleventh aspect. This heating element A is formed by forming flexible conductive sections 2 and 3 by a single conductor such as a coiled metal wire, and the conductive sections 2 and 3 are embedded in the heating section 1 so as to face each other. ing. Further, since the conducting portions 2 and 3 are formed in a coil shape, they have elasticity in the longitudinal direction and the lateral direction. In the heating element A, since the current-carrying portions 2 and 3 having flexibility and elasticity are used, the heat-expanding portions 2 and 3 follow the thermal expansion of the heat-generating portion 1 so that the thermal expansion of the heat-generating portion 1 is controlled by the current-carrying portion. The self-temperature control function can be accurately performed by accurately exhibiting the positive temperature characteristic.

The heating element A shown in FIGS. 13, 14 and 15 has a surface on the side of the current-carrying portions 2 and 3 which is in contact with the heat-generating portion 1 formed as an uneven peeling prevention portion 14 (claim 12). By embedding the separation preventing portion 14 in contact with the heat generating portion 1, it is possible to form the heating element A in which the conducting portions 2 and 3 are firmly integrated with the heat generating portion 1 and are difficult to be separated. FIG. 16 shows an example of an embodiment of the heating element A according to claim 13.
In the heating element A, the conductive portions 2 and 3 having flexibility are formed of a conductive paint. The conductive paint uses a resin component such as polyester, ultraviolet curable resin (UV resin), vinyl chloride resin, acrylic resin, polyolefin resin, silicone resin, and rubber-based resin as a binder, and disperses particles such as silver and carbon therein. In addition, it is prepared by diluting this with a diluent such as thinner or toluene, and has electrical conductivity. Then, the conductive paint is applied to the heating section 1.
Is applied to the surface of the substrate and dried to form the conductive portions 2 and 3 having flexibility and elasticity. In the heating element A, the current-carrying sections 2 and 3 having flexibility and elasticity are used, so that the current-carrying sections 2 and 3 follow the thermal expansion of the heating section 1 and the thermal expansion of the heating section 1 is controlled by the current-carrying section. The self-temperature control function can be accurately performed by accurately exhibiting the positive temperature characteristic.

FIG. 17 shows an embodiment of the heating element A according to claim 14. In the heating element A, the current-carrying parts 2, 3
Are provided at portions other than the outer peripheral portion of the surface of the heat generating portion 1 where heat is to be generated. That is, the conducting parts 2 and 3 are provided in parallel with the central part except the outer peripheral part of each surface (front and back) in the thickness direction of the heat generating part 1. Since the energizing portions 2 and 3 are provided at portions other than the outer peripheral portion of the surface of the heating portion 1 where heat is to be generated, even if the distance between the pair of energizing portions 2 and 3 is shortened, the energizing portions are sandwiched by the heating portion 1. Discharge can be prevented from occurring in the space between the two and three, and the heating part 1 can be prevented from being short-circuited due to carbonization, and the current-carrying parts 2 and 3 can be short-circuited and ignited. It can be secure and not.

FIG. 18 shows an embodiment of the heating element A according to claim 15. The heating element A includes current-carrying units 2 and 3
A contact preventing means 7 for preventing contact between the conducting parts 2 and 3 is provided inside the heat generating part 1 between them. The contact preventing means 7 is formed by arranging a plurality of insulators 8 side by side.
At least one of the softening point, heat deformation temperature, and melting point can be formed of an insulating material higher than the heat generating portion 1. For example, polyolefin resins such as polypropylene and polyethylene, polyamide resins, polyacetal resins, and PBT Resin, PET resin, PPS resin, phenol resin, epoxy resin, etc.
Alternatively, the heat generating portion 1 may be made of a ceramic such as ceramic and have higher insulation and heat resistance.

In such a heating element A, the contact preventing means 7 for preventing the contact of the conducting parts 2 and 3 is provided, so that the distance between the conducting parts 2 and 3 is reduced in order to uniformly generate heat. Even if the current-carrying parts 2 and 3 move or deform when the heat-generating part 1 is formed short or when the heat-generating part 1 is molded, the contact-preventing means 7 keeps the current-carrying parts 2 and 3 constant (the contact-preventing means 7 (Thickness) or more. In addition, the mechanical strength of the heat-generating part 1 and the current-carrying parts 2 and 3 is reduced due to heat in the actual use state. This prevents contact even if the current-carrying parts 2 and 3 are moved or deformed by external force. The means 7 can prevent the current-carrying parts 2 and 3 from coming into contact with each other and causing a short circuit. FIG. 19 shows an example of an embodiment of the heating element A according to claim 16. This heating element A is
The contact preventing means 7 is formed by arranging a plurality of insulators 8 side by side,
The contact portions 8a on the outer periphery of the insulator 8 are in contact with the inner surfaces of the conducting portions 2 and 3, respectively. In addition, as shown in FIG. 18, the outer periphery of the insulator 8 may not be in contact with the inner surfaces of the current-carrying portions 2 and 3. By forming the contact preventing means 7 with a plurality of insulators 8 as described above, the effect of preventing the contact of the conducting parts 2 and 3 by the contact preventing means 7 can be obtained over a wide range.

FIG. 20 shows another embodiment of the heating element A according to claim 16. In the heating element A, as in the case of FIG. 19, the contact preventing means 7 is formed by arranging a plurality of insulators 8 in parallel, and the outer periphery of the insulator 8 is brought into contact with the inner surfaces of the current-carrying parts 2 and 3, respectively. However, the insulator 8 is formed in a spherical shape. FIG. 21 shows an example of an embodiment of the heating element A according to claim 17. The heating element A is provided with a contact preventing means 7 for preventing the contact of the conducting parts 2 and 3 inside the heating part 1 between the conducting parts 2 and 3. It is composed of a body 8. Further, the contact portions 8a on the outer periphery of the insulator 8 are brought into contact with the inner surfaces of the conducting portions 2 and 3, respectively. By forming the contact preventing means 7 with a single (single) insulator 8 in this manner, the ratio of the resin material of the heat generating portion 1 is reduced, so that the positive temperature coefficient characteristic of the heat generating portion 1 is not hindered. can do.

FIG. 22 shows an embodiment of the heating element A according to claim 18. The heating element A is obtained by dispersing and impregnating the heating section 1 in the continuous porous body 15 which is the contact preventing means 7. Examples of the continuous porous material 15 include polyamide (nylon 6, nylon 66), acryl (acrylic acid, auron, dainel, berel), viscose rayon, cellulose ester (acetate, triacetate), polyester, vinyl derivative (vinylon H)
H, Saran), natural fibers (cotton waste, wool waste, jute),
A woven fabric obtained by weaving a fibrous material made of glass or the like, or a nonwoven fabric or the like obtained by hardening the fibrous material with a binder can be used.In addition, urethane, styrene, a continuous pore foam such as phenol, A continuous pore sintered body such as ceramics can be used, and an insulating material having at least one of a softening point, a heat deformation temperature, and a melting point higher than that of the heat generating portion 1 can be used. Further, the heat generating portions 1 are electrically connected to each other, and the heat generating portion 1 and the conducting portions 2 and 3 are electrically connected.

In the heating element A thus formed, since the heat generating portion 1 is contained in the continuous porous body 15, the contact preventing means 7 prevents the conductive portions 2, 3 from contacting with the continuous porous body 15. Can be reliably obtained over a wide range.
Further, the heat generating portion 1 and the current-carrying portions 2 and 3 can always generate heat uniformly, and can be controlled to a constant temperature.

FIG. 23 shows an embodiment of the heating element A according to claim 19. The heating element A is provided with the contact preventing means 7.
A grid body 10 having a long through-hole 9 in the direction between the conducting parts 2 and 3 is provided inside the heating part 1 between the conducting parts 2 and 3. Further, the resin material forming the heat generating portion 1 is also filled in the through hole 9. In the heating element A formed as described above, since the grid body 10 is used as the contact prevention means 7, the grid body 10 can reliably obtain the effect of preventing the contact of the current-carrying parts 2, 3 over a wide range. Further, by forming the heat generating portion 1 also in the through hole 9 of the lattice body 10, the heat generating portion 1 is formed.
In addition, it is possible to always generate heat uniformly from the current-carrying units 2 and 3, and to control the temperature to a constant temperature.

FIG. 24 shows another example of the lattice body 10. In the heating element A, the shape of the through hole 9 of the lattice body 10 is formed in a square. FIG. 25 shows another example of the lattice body 10. In the heating element A, the shape of the through hole 9 of the lattice body 10 is formed in a polygon such as a hexagon. FIG.
Here is another example. The heating element A is formed by the through holes 9 of the lattice body 10.
Is formed in a circular shape.

FIG. 27 shows an example of the heating element A according to the second aspect. The heating element A is formed by including a heating section 1 made of a resin material having the same positive temperature coefficient characteristics as in the conventional example, and a pair of conducting sections 2 and 3 for supplying electricity to the heating section 1. I have. The heat generating portion 1 is formed in a thin plate shape (sheet shape) having a certain width and thickness (L1), and is a resin material prepared by including a resin in a powdery conductive material having conductivity. It is formed with.

As the conductive material in the form of powder, iron, aluminum, copper, carbon (carbon black) and the like can be used, but in consideration of the heat generation properties of the heat generating portion 1, workability, durability and the like. It is preferable to use carbon. The resin constituting the heat generating portion 1 is made of a polyolefin resin, for example, a thermoplastic crystalline resin such as polypropylene or polyethylene, or the like, and has a positive temperature coefficient (PTC).
Polyamide resin, polyacetal resin, PBT (polybutylene terephthalate) resin, PET (polyethylene terephthalate) resin, PPS (polyphenylene sulfide) resin, phenolic resin, epoxy resin Etc.
These may be used alone or may be used by blending. Then, a resin material for forming the heat generating portion 1 is prepared by mixing the conductive material and the resin.

The energizing sections 2 and 3 are provided in parallel with the heating section 1 in a direction perpendicular to the surface of the heating section 1 where heat is to be generated. That is, the conducting portions 2 and 3 are provided in parallel with each surface (front and back surfaces) in the thickness direction of the heat generating portion 1 with the heat generating portion 1 interposed therebetween, and are formed in contact with the entire surface of each surface. The current-carrying parts 2 and 3 are formed of a synthetic resin material containing a conductive powdery substance such as lead, tin, silver, copper, or carbon.
The configuration has almost no CT characteristics.

As a method of forming the heating element A, that is, a method of fixing the current-carrying parts 2 and 3 to the heat-generating part 1, a method of extruding the heat-generating part 1 together with the current-carrying parts 2 and 3, A method for insert-molding the current-carrying parts 2 and 3 when injection-molding the part 1, a method for insert-molding the heat-generating part 1 when injection-molding the current-carrying parts 2 and 3, Method of simultaneous injection molding in a mold, heating part 1
A method of inserting and forming the current-carrying parts 2 and 3 when press-molding, a method of inserting and forming the heat-generating part 1 when press-forming the current-carrying parts 2 and 3, Method of press-forming simultaneously in a mold, heating part 1
, By heating the conductive parts 2 and 3 by a hot press, forming the conductive parts 2 and 3 by an arbitrary method, and then fusing the heat generating part 1 by a hot press. Can be exemplified by a method in which the conductive portions 2 and 3 are adhered with a conductive adhesive after molding by any method.

In the heating element A, the heat generating portion 1 has a rate of change of the resistance value which is twice or more within the operating temperature range, and has a resistance of 2 to 20 times between the maximum operating temperature and the maximum operating temperature + 10 ° C. It is possible to set the type of the material of the resin or the conductive material of the heat generating portion 1, the shape and the content of the heat generating portion 1, the material and the shape of the current-carrying portions 2 and 3, etc. so as to have the rate of change of the value. 20). That is, T1 (° C.) is the minimum operating temperature of the heating unit 1 in the operating temperature range (the range of arrow C in FIG. 28), Ra (Ω) is the resistance value at that time, and is the maximum operating temperature in the operating temperature range. When T2 (° C.), the resistance value at that time is Rb (Ω), and the resistance value at the maximum use temperature T2 + 10 ° C. is Rd (Ω) (the graph is logarithmic), Rb as shown in the curve d of FIG.
/ Ra> 2 and 20> Rd / Rb> 2, preferably 2.
The heat generating portion 1 has a characteristic satisfying 0> Rd / Rb> 4.
Is formed. And the characteristic of the heating part 1 is Rb /
If Ra> 2 and 20> Rd / Rb> 2, it is possible to control the temperature of the heating section 1 (heating element A) within the operating temperature range even when the applied voltage or the operating environment temperature changes. Yes and secure.

Note that Rb / Ra = 10 and Rd / Rb = 4.
When the heating portion 1 is formed so as to have a temperature of 6 ° C., the ambient temperature (ambient temperature) is 25 ± 15 with an applied voltage of 100 ± 20 V
Even when the temperature was changed to ° C., the temperature of the heating element A was controlled at ± 3 ° C. while maintaining a substantially constant value. Since the heat generated by the heating element A has a short distance between the conducting parts 2 and 3 as in the case of FIG. 1, a description will be given of a parallel model in which a plurality of resistors RA and RB are connected in parallel as shown in FIG. be able to. The calorific value Q is Q = V ²
Since / is represented by R, the resistance RA, calorific value QA occurring in RB, QB is, QA = V ² / RA, represented by QB = V ² / RB. Therefore, when the resistance value of the resistor RA increases due to the influence of convection (heat radiation), the heat value QA decreases, and when the resistance value of the resistor RB increases, the heat value QB decreases, and each portion of the heat generating portion 1 becomes independent. Control can be performed, and a temperature distribution (temperature variation) can be prevented.

More specifically, in the heating element A having such a configuration, the resistance value of the heating section 1 (a resin material having a positive temperature coefficient characteristic) does not rapidly change with temperature. The rate of change of the resistance value within the temperature range is 10
In the temperature range of less than twice, the resistance value of the heating element is not affected by the ambient temperature of the heating element A (even if the outer peripheral part is low due to heat radiation or the like) (the ambient temperature of the heating element slightly varies). Also, the resistance value does not change much), and the calorific value does not change much, so that the temperature of the heating element is kept almost uniform. In addition, when the ambient temperature, the applied voltage, etc. change, the heating element A
Even if the temperature changes, it can be controlled to a constant temperature.

On the other hand, as shown in FIG. 3 (a), the resistance value R of the heat generating portion 1 (resin material having a positive temperature coefficient characteristic) rapidly changes depending on the temperature. Is used in a temperature range in which the rate of change of the resistance value R is 10 times or more, the resistance value R of the heating element A is affected by the ambient temperature of the heating element A (if the temperature is low due to heat radiation or the like in the outer peripheral portion). However, if the ambient temperature of the heating element A slightly changes from that of FIG. 3A, the resistance value R greatly changes as shown in FIG. Since they are controlled independently (the temperature T changes in the thickness direction in the BB section as shown in FIG. 3 (g), the surface temperature of the heat generating portion 1 becomes constant) as shown in FIG. 3 (f). 3D, even when the ambient temperature, the applied voltage, and the like change. It is possible to control to a constant temperature T. In addition, X in FIG. 3 indicates a displacement position in the CC section of FIG. 3B, and Y in FIG. 3 indicates BB in FIG. 3C.
The displacement positions in the cross section are shown.

FIG. 29 shows an example of the heating element A according to claim 21. This heating element A is formed in a shape similar to that of FIG. 27, but the heating section 1 and the current-carrying sections 2, 3 are formed using the same synthetic resin material. And this heating element A
The heat generating portion 1 and the conducting portions 2 and 3 can be securely adhered to each other by heat fusion or the like, and at the same time, the linear expansion coefficients of the synthetic resin materials forming the heating portion 1 and the conducting portions 2 and 3 become the same, The thermal expansion of the heat generating portion 1 can be prevented from being restricted by the current-carrying portions 2 and 3, and the positive temperature characteristic is exhibited without any restriction, and the self-temperature control function is accurately exhibited.

FIG. 30 shows an example of the heating element A according to claim 22. The heating element A is formed in a shape similar to that of FIG. 27, but the heating section 1 and the current-carrying sections 2, 3 are formed of a material having substantially the same linear expansion coefficient. That is, the heating unit 1
The difference in the coefficient of linear expansion between the heat-generating part 1 and the current-carrying parts 2 and 3 is so small that the current-carrying parts 2 and 3 expand by the same amount (the same length) as the heat-generating part 1 even if the thermal expansion occurs. I have. In forming the heat generating portion 1 and the conducting portions 2 and 3, the same synthetic resin material or a synthetic resin material having substantially the same linear expansion coefficient is used. In the heating element A, since the linear expansion coefficients of the synthetic resin materials constituting the heating section 1 and the conduction sections 2 and 3 are substantially the same, the thermal expansion of the heating section 1 is not restricted by the conduction sections 2 and 3. In this case, the positive temperature characteristic is exhibited without restriction and the self-temperature control function is accurately exhibited.

FIG. 31 shows an example of the heating element A according to claim 23. The heating element A includes a step 16 formed so as to be offset to one side in the thickness direction of the energizing sections 2 and 3.
The current-carrying portions 2 and 3 are formed on the surface of the heat-generating portion 1 in the thickness direction. Therefore, the heating part 1
The gap between the peripheral ends (steps 16) of the conducting parts 2, 3 at the peripheral end of is formed to be smaller than the gap between the conducting parts 2, 3 other than the peripheral end of the heat generating part 1. By reducing the distance between the current-carrying portions 2 and 3 in this manner, the heat-generating portion 1 can generate more heat than any other portion where the distance between the current-carrying portions 2 and 3 is wide. Therefore, for example, by narrowing (shorting) the interval (distance) between the conducting portions 2 and 3 only in a portion where the temperature becomes low due to the influence of heat radiation (for example, in the vicinity of the peripheral end portion of the heat generating portion 1), The surface temperature can be kept more uniform.

FIG. 32 shows an example of an embodiment of a hair setting device B according to claim 24. This hair curling device B is a hair curler formed in a cylindrical shape, and one of the above-described heating elements A (such as that shown in FIG. 4) is placed inside a cylindrical hair winding body 45 formed of an insulating material. It is provided and formed. This heating element A is formed by providing one energizing section 2 on the outer surface of a cylindrical heating section 1 over the entire circumference and providing the other energizing section 3 on the inner surface of the heating section 1 over the entire circumference. The outer surface of the power supply unit 2 is in contact with the inner surface of the hair winding body 45. Both ends of the hair winding body 45 are formed as hair winding body ends 46 which are thicker than the center of the hair winding body 45, so that the hair can be easily wound. The hair winding body 45 has a plurality of hair winding ribs 47 along its circumference.
Are provided so that the hair can be easily wound and, at the same time, the heat when touching the hair winding body 45 can be reduced. Further, if the hair winding body 45 is made of a material having flexibility, the feel at the time of use can be improved. still,
Reference numeral 25 in the figure denotes a terminal portion electrically connected to a power supply.

In this hair curler, since the heating element A of the present invention is used, the hair winding body 45 can be uniformly heated over the entire body, and the hair can be curled uniformly. It is possible to make it simpler and lighter than a conventional hair curler. FIG. 33 shows another embodiment of the hair setting device B according to claim 24. This hair curling device B is a hair brush, and one of the above-described ones (FIG. 5) is brought into contact with the outer surface of the heating element holding portion 49 of the brush main body 48 by contacting one of the conducting portions 3 on the lower side of the heating portion 1. And the like, and the bristle base 52 is arranged so as to contact the outer surface of the other energizing part 2 above the heat generating part 1 and a plurality of bristles 53 are provided on the outer surface of the bristle base 52, It is formed by engaging a bristle base convex portion 50 formed at an end of the bristle base 52 with a brush concave portion 51. The heating element A is in close contact with the bristle base 52 and is held between the heating element holding section 49 and the heating element holding section 49. The bristle base 52 and the bristle 53 may be made of the same material or different materials, and the heating element holding portion 49 and the brush concave portion 51 may be made of the same material or different material as the brush body 48. Is also good.

In this hair brush, since the heating element A of the present invention is used, the bristle table 52 can be uniformly heated throughout the hair, and the hair can be uniformly curled. The structure is simpler and lighter than a conventional heat-generating hair brush. FIG. 34 shows another embodiment of the hair setting device B according to claim 24. This hair curling device B is a hair brush in which a grip portion 55 is provided on a brush portion 54 formed similarly to the hair brush of FIG. 33, and a cord portion 56 connected to a power supply device built in the grip portion 55 and the like. Is drawn out from the end of the grip 55 and a plug 57 is provided at the tip of the cord 56 to be inserted into an outlet. The plug 57 is connected to an outlet to supply electricity to the power supply device, and the power supply device supplies electricity to the heating element A to generate heat, thereby enabling use.

In this hair brush, since the heating element A of the present invention is used, the bristle base 52 of the brush portion 54 is used.
Can generate heat uniformly throughout the entire body, and can evenly shape the hair and can have a simpler and lighter structure than conventional heat-generating hair brushes, improving usability. Is what you do. FIG. 35 shows another embodiment of the hair setting device B according to claim 24. This hair curling device B is a hair brush in which a grip portion 55 is provided on a brush portion 54 formed in the same manner as the hair brush of FIG. 33, and a battery storage portion 58 is provided in the grip portion 55 so as to be opened. The battery 59 is inserted, and the battery
The battery cover 92 is arranged so as to close the opening 8 and the battery cover 92 is fixed to the grip 55 by the battery cover engaging portion 61 provided on the battery cover 92. The heating element A can be heated by the electricity supplied from the battery 59. still,
The battery storage section 58 may be provided anywhere inside the hair brush.

In this hair brush, since the heating element A of the present invention is used, the bristle base 52 of the brush portion 54 is used.
Can generate heat uniformly over the entirety, can evenly shape the hair and can have a simpler and lighter structure than a conventional heat-generating hair brush. Since the heat source 59 is used as a power source for generating heat from the heating element A, portability and usability are improved.

FIG. 36 shows another embodiment of the hair setting device B according to claim 24. The hair curling device B in FIG. 33 has a structure having a ventilation hole 60 penetrating the bristle base 52, the heating element A, and the heating element holding portion 49. In this hair brush, since the heating element A of the present invention is used, the bristle table 52 can be uniformly heated throughout the hair, so that the hair can be uniformly shaped and the conventional heating method can be used. The structure is simpler and lighter than the hair brush.

FIG. 37 shows another embodiment of the hair setting device B according to claim 24. This hair curling device B is composed of a brush body 61 and a dryer main body 62. The brush body 61 has a cylindrical brush fitting portion 63 provided on a brush portion 54 similar to the hair brush of FIG. Is formed. A fitted portion 64 is projected from the distal end of the dryer main body 62, and an electrical connection portion 65 and an air discharge port 66 are formed on the distal end surface of the fitted portion 64. An engagement portion 67 is provided on a side surface of the portion 64. Further, an air suction port 68 is formed at the rear of the dryer main body 62, and a cord portion 56 having a plug 57 at the tip is led out from the rear of the dryer main body 62. Also, as shown in FIG.
2 is a motor 7 provided with a heater 69 and a fan 70.
1 are built in and connected to power supply devices (not shown) that are electrically connected to the cord section 56, respectively. Further, the heater 69 is electrically connected to the electric connection section 65 by a wiring 95.

In such a hair setting device B, the brush fitting portion 63 of the brush body 61 is fitted to the fitted portion 64 of the dryer main body 62, and the engaging portion 67 is engaged with the brush fitting portion 63. The brush body 61 and the dryer main body 62 are used integrally. When the switch 72 is turned on with the plug 57 connected to the outlet, the heater 69 is supplied with power and generates heat, and the motor 71 operates to rotate the fan 70. By the rotation of the fan 70, air is introduced into the dryer main body 62 from the air suction port 68, the introduced air is heated by the heater 69, and the warmed air passes through the air discharge port 66 and the brush body 61. Will be introduced. Thereafter, the air introduced into the brush body 61 is discharged through the ventilation holes 60 and supplied to the hair. When the switch 72 is turned on, electricity is supplied to the heating element A in the brush body 61 through the electric connection portion 65, so that the heating element A generates heat.

In this hair brush, since the heating element A of the present invention is used, the bristle table 52 can be uniformly heated throughout the hair brush, so that the hair can be uniformly shaped and the hair can be made uniform. The structure is simpler and lighter than the heat-generating hair brush. In addition, the hair can be blown with hot air, the hair can be dried at the same time, and the hair can be shaped more effectively.

FIG. 39 shows another embodiment of the hair setting device B according to claim 24. The hair curling device B is a hair clip which is used so as to sandwich hair. The hair clip is composed of a pair of clip bodies 75 formed in a substantially rectangular shape by the operation section 73 and the sandwiching section 74.
By pivotally connecting the connecting pieces 76 formed at the connecting portion between the operating portion 73 and the sandwiching portion 74 using the shaft 96, the pair of clip bodies 75 are rotated with respect to each other. It is connected so that it can be done.

A spring 77 formed of a leaf spring or the like is provided between the opposing operation portions 73. The elastic force of the spring 77 constantly biases the holding portions 74 in a direction in which the holding portions 74 come close to each other and close. Have been. Then, one of the above (such as the one in FIG. 1)
The heating element A is built in, and the hair is
The hair clip is used so that the heat of the heating element A is supplied to the hair via the clip 74.

In this hair clip, since the heating element A of the present invention is used, the portion sandwiching the hair can be uniformly heated over the entirety, and the hair can be uniformly curled. The structure is simpler and lighter than a conventional heat-type hair clip.
FIG. 40 shows another embodiment of the hair setting device B according to claim 24. This hair curling device B is composed of a grip body 7
8 is provided with a cylindrical hair winding body 79 and a hair presser 80, and any one of the above-described heating elements A (such as that shown in FIG. 4) is provided inside the hair winding body 79. ing. This heating element A is formed by providing one energizing section 3 on the outer surface of a cylindrical heating section 1 over the entire circumference and providing the other energizing section 2 on the inner surface of the heating section 1 over the entire circumference. The outer surface of the power supply unit 3 is in contact with the inner surface of the hair winding body 79. Further, a cord portion 81 is connected to the energizing portions 2 and 3, and a plug 82 is provided at a tip of the cord portion 81 extending from an end of the grip body 78. The hair retainer 80 is composed of a retainer 83 and a knob 84, and holds a joint 86 between the retainer 83 and the knob 84, and pivots using a shaft 96 to a support 85 protruding from the main body 78. By putting on, the hair retainer 80 is rotatably attached to the grip body 78.

A spring 77 such as a leaf spring is provided between the grip body 78 and the knob 84. The elastic force of the spring 77 causes the holding portion 83 to close to and close to the hair winding body 79. Always being energized. Then, the hair is wound around the hair winding body portion 79 in a state where heat is generated by energizing the heating element A via the plug 82 and the cord portion 81, and the hair wound around the hair winding body portion 79 by the holding portion 83 of the hair holding member 80. By pressing the hair, it is possible to add a habit to the hair. In addition, this hair set device B
However, a built-in battery type as shown in FIG. 35 may be adopted.

In the hair setting device B, since the heating element A of the present invention is used, heat can be uniformly generated over the entire portion between the hairs, and the curling of the hair can be uniformly performed. It can be made simpler and lighter in weight than a conventional heat-generating hair setting device. In addition, by incorporating a battery, the portability is improved and the usability is improved.

[0085]

As described above, the invention according to claim 1 of the present invention is characterized in that a heat generating portion formed of a resin material containing a powdery conductive material having conductivity and having a positive temperature coefficient characteristic;
In a heating element formed with at least a pair of current-carrying portions that conduct current to the heat-generating portion, the current-carrying portion is provided substantially in parallel with the heat-generating portion in a direction perpendicular to a surface on which heat is to be generated. The distance can be made short and constant, so that even if the outer peripheral part is cooled by the heat radiation in the state where heat is generated, the surface of the heat generating part where heat is to be generated is uniformly generated over the entire surface. And temperature control can be performed reliably at the same time.

According to the second aspect of the present invention, there is provided a heat generating portion made of a resin material containing a powdery conductive material having conductivity and having a positive temperature coefficient characteristic, and at least a current flowing through the heat generating portion. A heating element formed by including a pair of current-carrying portions, wherein the current-carrying portion is provided substantially in parallel with the heat-generating portion in a direction perpendicular to a surface on which heat is to be generated and contains a conductive material in the form of a powder having conductivity; Since the current-carrying portion is formed of a resin material, the distance between the current-carrying portions can be kept short and constant. Therefore, even if the outer peripheral portion is cooled under the influence of heat radiation in a state where heat is generated, heat is generated. It is possible to uniformly generate heat over the entire surface of the section where heat is to be generated, and at the same time, it is possible to reliably perform temperature control. In addition, since the current-carrying part is formed of a resin material containing a conductive material in the form of a powder having conductivity, the weight can be reduced, and the adhesion between the heat-generating part and the current-carrying part can be increased to ensure electrical contact. It can be formed into an arbitrary shape by molding.

In the invention according to claim 3 of the present invention, since the current-carrying portion has a higher mechanical strength than the heat-generating portion at the time of heat generation, the heat-generating portion becomes soft at the time of heat generation and can maintain its own shape. Even if it disappears, the shape of the heat generating portion can be maintained by the energizing portion so that the shape does not collapse, so that it is easy to use and safe. In the invention according to claim 4 of the present invention, the heat generating portion has a change rate of the resistance value of 10 times or more in a use temperature range, and 10 times between a maximum use temperature and a maximum use temperature + 5 ° C. With the above-described rate of change in the resistance value, the temperature of the heating element can be controlled within the operating temperature range even when the applied voltage or the operating environment temperature changes, which is safe.

Further, in the invention according to claim 5 of the present invention, since the distance between the pair of energizing sections is always constant, heat can always be generated uniformly in the heat generating section and the energizing section, and the temperature can be kept constant. It can be controlled. In the invention according to claim 6 of the present invention, since the separation preventing means is provided between the heat-generating portion and the current-carrying portion, the separation can be prevented from occurring between the heat-generating portion and the current-carrying portion. It is possible to energize the various heat generating parts and to generate uniform heat. In addition, the current-carrying parts do not come into contact with each other to cause a short-circuit and cause a fire, which is safe.

Further, in the invention according to claim 7 of the present invention, since the engaging portion having a concave and convex shape is formed in the current-carrying portion as the peeling preventing means, the peeling is prevented from occurring between the heating portion and the current-carrying portion. Thus, the power can be uniformly supplied to the heat generating portion, and uniform heat generation can be performed. Further, in the invention according to claim 8 of the present invention, since an uneven holding portion is formed on the heat generating portion as the separation preventing means, it is possible to prevent separation between the heat generating portion and the conducting portion, It is possible to uniformly supply power to the heat-generating portion and to generate uniform heat.

According to a ninth aspect of the present invention, there is provided a heating section formed of a resin material containing a powdery conductive material having conductivity and having a positive temperature coefficient characteristic, and energizing the heating section. Since at least one pair of flexible conducting parts is provided, the thermal expansion of the heat generating part can be prevented from being restricted by the conducting part, and the positive temperature characteristics are not restricted and the self-temperature control function is accurate. It comes out to.

Further, the invention according to claim 10 of the present invention provides
The current-carrying portion is a conductor such as a stranded wire or a mesh wire and has elasticity, so that the thermal expansion of the heat-generating portion can be prevented from being restricted by the current-carrying portion, and the positive temperature characteristic is not restricted. The self-temperature control function comes out correctly. Further, in the invention according to claim 11 of the present invention, since the current-carrying portion is a corrugated or coil-shaped conductor and has elasticity, the thermal expansion of the heat-generating portion is not restricted by the current-carrying portion. The positive temperature characteristic can be obtained without any restriction, and the self-temperature control function can be accurately performed.

The invention according to claim 12 of the present invention provides:
Since the conductive portion is provided with an uneven peeling preventing portion for preventing peeling from the heat generating portion, it is possible to prevent peeling from occurring between the heat generating portion and the conductive portion, and to a uniform heat generating portion. Electricity can be supplied and uniform heat generation can be performed. In addition, the current-carrying parts do not come into contact with each other to cause a short-circuit and cause a fire, which is safe.

The invention according to claim 13 of the present invention provides:
Since the current-carrying part is formed of conductive paint and has elasticity, it is possible to prevent the thermal expansion of the heat-generating part from being restricted by the current-carrying part. It comes out exactly. Further, in the invention according to claim 14 of the present invention, since the current-carrying portion is provided at a portion other than the outer peripheral portion of the surface of the heat-generating portion where heat is to be generated, even if the distance between the pair of current-carrying portions is shortened, the heat-generating portion is sandwiched. It is possible to prevent discharge from occurring in the space between the current-carrying parts, to prevent the heat-generating part from being short-circuited by carbonization, and to prevent the problem that the current-carrying part is short-circuited and ignited. Can be secure.

The invention according to claim 15 of the present invention provides
A contact prevention means for preventing contact of the current-carrying part is provided between the current-carrying parts, and the contact prevention means is formed of an insulating material in which at least one of a softening point, a heat deformation temperature, and a melting point is higher than that of the heat-generating part. Therefore, in order to uniformly generate heat, the contact preventing means keeps current flowing even if the current-carrying part moves or deforms when the distance between the current-carrying parts is reduced and when the heat-generating part is molded. The section can be prevented from approaching a certain distance or more, and the current-carrying section can be prevented from contacting and short-circuiting, which is safe. In addition, even if the heat-generating part and the current-carrying part are in actual use and the mechanical strength is reduced due to heat, even if the current-carrying part moves or deforms due to external force, the contact-preventing means makes the current-carrying parts contact each other. It is safe to prevent short circuit.

The invention according to claim 16 of the present invention provides:
Since the contact preventing means is composed of a plurality of insulators, the contact preventing means can prevent the current-carrying portion from approaching a certain distance or more, and prevent the current-carrying portion from contacting and short-circuiting. The effect can be obtained over a wide range. In the invention according to claim 17 of the present invention, since the contact preventing means is formed of a single insulator, it is possible to obtain an effect that it is possible to prevent a short circuit due to contact with a current-carrying part, and In addition, the reduction in the proportion of the resin material in the heat generating portion is reduced, and the positive temperature coefficient characteristics of the heat generating portion can be prevented.

The invention according to claim 18 of the present invention provides:
Since the contact preventing means is formed of a continuous porous body, it is possible to obtain an effect that the current-carrying portion can be prevented from contacting and short-circuiting, and at the same time, the heating section is impregnated in the continuous porous body. As a result, heat can be uniformly generated from the whole, and the temperature can be surely controlled to a constant value.

The invention according to claim 19 of the present invention provides:
Since the contact preventing means is formed of a lattice body having a through-hole in the direction between the current-carrying portions, it is possible to obtain an effect that the current-carrying portion can be prevented from being short-circuited by contact with the current-carrying portion. Since the part is impregnated, the whole can be uniformly heated, and the temperature can be surely controlled at a constant temperature.

The invention according to claim 20 of the present invention provides:
Since the heat generating portion has a change rate of the resistance value of 2 times or more in the use temperature range and a change rate of the resistance value of 2 to 20 times between the maximum use temperature and the maximum use temperature + 10 ° C. Even if the voltage or the use environment temperature changes, the temperature of the heating element can be controlled within the use temperature range, which is safe. In the invention according to claim 21 of the present invention, since the heat-generating portion and the current-carrying portion are formed of the same synthetic resin material, the heat-generating portion and the current-carrying portion can be securely brought into close contact with each other by heat fusion or the like. , The linear expansion coefficient of the synthetic resin material that constitutes the heat-generating part and the current-carrying part is the same, so that the heat-carrying part does not restrict the thermal expansion of the heat-generating part, and the positive temperature characteristics are exhibited without any restrictions. Thus, the self-temperature control function is accurately exhibited.

The invention according to claim 22 of the present invention provides:
Since the heat-generating portion and the current-carrying portion are formed of a material having substantially the same linear expansion coefficient, the amount of change in thermal expansion of the heat-generating portion and the current-carrying portion can be made substantially the same, and the heat expansion of the heat-generating portion can be energized. The positive temperature characteristic can be exhibited without restriction and the self-temperature control function can be accurately exhibited.

The invention according to claim 23 of the present invention provides:
Since the distance between the pair of current-carrying portions is changed depending on the location of the heat-generating portion, the surface temperature can be kept more uniform by narrowing the gap between the current-carrying portions only in the portion where the temperature is reduced due to the heat radiation. You can do it. According to a twenty-fourth aspect of the present invention, since the heating element according to any one of the first to twenty-third aspects is used, a portion to be applied to the hair can be uniformly heated by the heating element, so that the hair has a habit. Can be performed uniformly.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of an embodiment of a heating element of the present invention.

FIG. 2 is an explanatory diagram showing a virtual model according to the first embodiment;

FIG. 3 is an explanatory diagram showing a temperature, a resistance value, and a calorific value in a low temperature region of the above.

FIG. 4 is a perspective view showing another example of the above.

FIG. 5 is a perspective view showing another example of the above.

FIG. 6 is a graph showing a relationship between a temperature and a resistance value of another embodiment of the above.

FIG. 7 is a partial cross-sectional view showing an example of another embodiment of the above.

FIG. 8 is a partial cross-sectional view showing an example of another embodiment of the above.

FIG. 9 is a partial cross-sectional view showing another example of the above.

FIG. 10 is a partial cross-sectional view showing another example of the above.

FIG. 11 is a partial cross-sectional view showing an example of another embodiment of the above.

FIG. 12 is a partial cross-sectional view showing an example of another embodiment of the above.

FIG. 13 is a partial cross-sectional view showing another example of the above.

FIG. 14 is a partial cross-sectional view showing another example of the above.

FIG. 15 is a partial sectional view showing another example of the above.

FIG. 16 is a partial cross-sectional view showing an example of another embodiment of the above.

FIG. 17 is a perspective view showing an example of another embodiment of the above.

FIG. 18 is a partial cross-sectional view showing an example of another embodiment of the above.

FIG. 19 is a partial cross-sectional view showing another example of the above.

FIG. 20 is a partial cross-sectional view showing another example of the above.

FIG. 21 is a partial cross-sectional view showing another example of the above.

FIG. 22 is a partial sectional view showing another example of the above.

FIG. 23 is a partial cross-sectional view showing one example of another embodiment of the above.

FIG. 24 is a perspective view showing an example of the lattice body of the above.

FIG. 25 is a perspective view showing another example of the grid body of the above.

FIG. 26 is a perspective view showing another example of the grid body of the above.

FIG. 27 is a partial cross-sectional view showing one example of another embodiment of the above.

FIG. 28 is a graph showing the relationship between temperature and resistance value in another embodiment of the above embodiment.

FIG. 29 is a partial cross-sectional view showing one example of another embodiment of the above.

FIG. 30 is a partial cross-sectional view showing an example of another embodiment of the above.

FIG. 31 is a sectional view showing an example of another embodiment of the above.

FIG. 32 is a cross-sectional view showing an example of an embodiment of the hair setting device of the present invention.

FIG. 33 is a sectional view showing an example of another embodiment of the above.

FIG. 34 is a perspective view showing an example of another embodiment of the above.

FIG. 35 is an exploded perspective view showing an example of another embodiment of the above.

FIG. 36 is a sectional view showing an example of another embodiment of the above.

FIG. 37 is an exploded perspective view showing an example of another embodiment of the above.

FIG. 38 is a schematic view showing the inside of the above.

FIG. 39 is a side view showing an example of another embodiment of the above.

FIG. 40 is a sectional view showing an example of another embodiment of the above.

FIG. 41 is a perspective view showing a conventional example.

FIG. 42 is a schematic view showing the operation of a heating element.

FIG. 43 is a graph showing the relationship between the temperature of the heating element, the amount of heat generation, and the resistance value.

FIG. 44 is an explanatory diagram showing a virtual model of a conventional example.

FIG. 45 is an explanatory diagram showing a temperature, a resistance value, and a calorific value in a low temperature range of a conventional example.

FIG. 46 is an explanatory diagram showing a temperature, a resistance value, and a calorific value in a high temperature region of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat generation part 2 Current supply part 3 Current supply part 4 Exfoliation prevention means 5 Locking part 6 Holding part 7 Contact prevention means 8 Insulator 9 Through hole 10 Lattice body 14 Exfoliation prevention part 15 Continuous porous body A Heating element B Hair set device

Claims (24)

[Claims] 1. A heating element formed of a resin material containing a powdery conductive substance having conductivity and having a positive temperature coefficient characteristic, and formed with at least a pair of current-carrying sections for energizing the heating section. A heating element characterized in that the heating element is provided substantially in parallel with the heating section in a direction perpendicular to a surface on which the heat is to be generated. 2. A heat-generating part comprising a resin material containing a powdery conductive material having conductivity and having a positive temperature coefficient characteristic, and at least a pair of current-carrying parts for supplying current to the heat-generating part. In the heating element to be provided, the current-carrying part is provided substantially in parallel with the heat-generating part in a direction perpendicular to the surface on which heat is to be generated, and the current-carrying part is formed of a resin material containing a powdery conductive material having conductivity. A heating element characterized by comprising: 3. The heating element according to claim 1, wherein the current-carrying portion has a higher mechanical strength when generating heat than the heat-generating portion. 4. The heating section has a rate of change of resistance of 10 times or more in a use temperature range, and a rate of change of resistance of 10 times or more between a maximum use temperature and a maximum use temperature + 5 ° C. The heating element according to any one of claims 1 to 3, wherein the heating element is provided. 5. The heating element according to claim 1, wherein a distance between the pair of current-carrying parts is always constant. 6. The heating element according to claim 1, further comprising a separation preventing means provided between the heating section and the conducting section. 7. The heating element according to claim 6, wherein an uneven locking portion is formed on the current-carrying portion as the separation preventing means. 8. The heating element according to claim 6, wherein a holding portion having an uneven shape is formed on the heating portion as the separation preventing means. 9. A heating section formed of a resin material containing a powdery conductive material having conductivity and having a positive temperature coefficient characteristic, and at least one pair of flexible conducting sections for supplying electricity to the heating section. The heating element according to any one of claims 1 to 8, wherein the heating element is provided. 10. The heating element according to claim 9, wherein the current-carrying portion is a conductor such as a stranded wire or a mesh wire, and has elasticity. 11. The heating element according to claim 9, wherein the current-carrying part is a corrugated or coiled conductor and has elasticity. 12. The heating element according to claim 9, wherein the current-carrying portion is provided with an uneven peeling prevention portion for preventing peeling from the heating portion. 13. The heating element according to claim 9, wherein the current-carrying part is formed of a conductive paint and has elasticity. 14. The heating element according to claim 1, wherein the current-carrying portion is provided at a portion other than an outer peripheral portion of a surface of the heat-generating portion where heat is to be generated. 15. A contact-preventing means for preventing contact of a current-carrying part between said current-carrying parts is provided.
15. The heating element according to claim 1, wherein at least one of the melting points is made of an insulating material higher than the heat generating part to form the contact preventing means. 16. The heating element according to claim 15, wherein said contact preventing means is constituted by a plurality of insulators. 17. The heating element according to claim 15, wherein said contact preventing means is constituted by a single insulator. 18. The heating element according to claim 15, wherein said contact preventing means is formed of a continuous porous body. 19. The heating element according to claim 15, wherein said contact prevention means is formed of a lattice having a through hole in a direction between current-carrying parts. 20. The heat generating portion has a resistance change rate of at least twice within a use temperature range, and a resistance change rate of 2 to 20 times between a maximum use temperature and a maximum use temperature + 10 ° C. The heating element according to claim 1, comprising: 21. The heating device according to claim 1, wherein the heat-generating portion and the current-carrying portion are formed of the same synthetic resin material.
0. The heating element according to any one of 0. 22. The heating element according to claim 1, wherein the heating section and the current-carrying section are formed of a material having substantially the same linear expansion coefficient. 23. The apparatus according to claim 1, wherein a distance between said pair of current-carrying portions is changed depending on a portion of said heat-generating portion.
23. The heating element according to any one of claims 22 to 22. 24. A hair setting device comprising the heating element according to claim 1. Description: