JPH1012359A - Surface shape heating element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive small-sized surface shape heating element capable of precisely detecting the temperature of a heating part by forming the heating part and a temperature detecting part on a nonconductive base under a specified condition. SOLUTION: A heating part 2 and a temperature detecting part 3 each of which is formed of conductive material are formed by printing in such a manner that they are arranged, preferably, on the same plane of a base 1, and, more preferably, the temperature detecting part 3 is laid along the heating part 2. Namely, a conductive material (e.g. Ag conductive material) having positive resistance temperature characteristic or negative resistance temperature characteristic regulated so as to have a prescribed resistance value is pattern-printed on the same plane of a nonconductive material 1 (e.g. resin sheet) to form the heating part 2 and the temperature detecting part 3, a current is carried between the electrode parts 4, 4 of the heating part 2, and the temperature change quantity is detected by the change of resistance value between the electrode parts 5, 5 of the temperature detecting part 3, when the heating part 2 is heated to a prescribed temperature, to detect the temperature of the heating element 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planar heating element that generates heat when energized, and more particularly to a planar heating element used as a heater element of an electric heater, an electric cooker, and the like.

[0002]

2. Description of the Related Art As a conventional planar heating element of this type, as described in Japanese Patent Application Laid-Open No. 62-118384, a heating wire and a temperature detection wire each made of a metal foil are arranged in parallel with each other. A planar heating element is disclosed in which a low-melting resin layer is formed on both surfaces and a high-melting insulating film is provided on both surfaces.

In recent years, a heat-generating portion is formed by printing a conductive material adjusted to a required resistance value on a non-conductive substrate which is a non-conductive material as a base material. There has been proposed a material in which a conductive material, which is similarly adjusted to a required resistance value, is printed on a resin sheet, which is a conductive material, to form a heat-generating portion, thereby providing flexibility.

[0004]

However, these planar heating elements are merely provided with a function as a heating element, and are necessary when the planar heating element is used by being incorporated into a product. It is necessary to separately attach and use a temperature detecting means such as a thermistor for controlling the temperature to be set as described above. As a result, the number of parts for the temperature detecting means increases, and the assembling time also increases. As a result, there is a problem that the manufacturing cost increases.

In addition, the temperature detecting means provided separately as described above has a problem that it can only detect the temperature around the temperature detecting means and cannot accurately detect the temperature of the heat generating portion.

Further, in a product using the planar heating element, a space for separately arranging the temperature detecting means is required, and there is a problem that the product becomes large.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a planar heating element which is inexpensive, can accurately detect the temperature of a heating section, and can further reduce the size of a product using the planar heating element. It is intended for.

[0008]

According to a first aspect of the present invention, there is provided a sheet heating element, comprising: a heating section made of a conductive material on a non-conductive substrate; And the heat generating part and the temperature detecting part are formed by printing.

According to a second aspect of the present invention, in the sheet heating element of the first aspect, the heating section and the temperature detecting section are formed on the same surface of the non-conductive substrate. It is characterized by the following.

Further, a planar heating element according to a third aspect of the present invention is the planar heating element according to the second aspect, wherein the temperature detecting section is disposed along the heating section. It is.

In addition, the sheet heating element according to a fourth aspect of the present invention is the sheet heating element according to the first aspect, wherein the heat generating portion is provided on one surface of the non-conductive substrate. The temperature detecting unit is provided at a position corresponding to the heat generating unit on the other surface of the non-conductive base material.

According to the above construction, in the sheet heating element according to the first aspect of the present invention, a heating section and a temperature detection section each made of a conductive material are arranged close to each other on a non-conductive substrate. Since the heat generating portion and the temperature detecting portion are formed by printing, the temperature detecting portion can accurately detect the temperature of the heat generating portion. In addition, since the heating section and the temperature detection section are formed by printing, the sheet heating element using a metal foil that requires a conventional laminating step and the sheet heating element that requires a temperature detection means are required as compared with the sheet heating element that is separately required. The heat generating portion and the temperature detecting portion can be easily formed, and the manufacturing cost can be reduced. In addition, since the heat generating portion and the temperature detecting portion can be formed of a thin film, the size of the sheet heating element itself can be reduced as compared with a sheet heating element using metal foil, and a separate temperature detecting means is required. The temperature detecting means can be dispensed with as compared with a simple sheet heating element, and the space for arranging products using the sheet heating element can be reduced.

According to a second aspect of the present invention, in the sheet heating element of the first aspect, the heating section and the temperature detecting section are formed on the same surface of the non-conductive substrate. Therefore, the heat generating portion and the temperature detecting portion can be formed simultaneously, and the heat generating portion and the temperature detecting portion can be formed more easily by simplifying the manufacturing process, thereby further reducing the manufacturing cost. Can be.

Further, in the sheet heating element according to the third aspect of the present invention, in the sheet heating element according to the second aspect, the temperature detecting portion is disposed along the heat generating portion. The temperature change can be more accurately detected by the temperature detector.

In addition, the sheet heating element according to claim 4 of the present invention is the sheet heating element according to claim 1, wherein the heating section is provided on one surface of the non-conductive substrate. Since the temperature detection unit is provided at a position corresponding to the heat generation unit on the other surface of the non-conductive base material, the temperature change of the heat generation unit can be more accurately detected by the temperature detection unit. it can.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A planar heating element according to an embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a plan view showing a planar heating element according to a first embodiment of the present invention, and FIG. 2 is a sectional view taken along line AA of FIG.

The planar heating element according to the first embodiment of the present invention comprises:
A positive resistance temperature characteristic (positive characteristic) or a negative resistance temperature characteristic (negative characteristic) adjusted to have a predetermined resistance value on the same surface of a resin sheet (corresponding to a nonconductive substrate) 1 which is a nonconductive material. Heat-generating part 2 by pattern-printing a conductive material having
And a temperature detecting section 3 for detecting the temperature of the heat generating section 2 are provided close to each other. In the figure, reference numeral 4 denotes first electrode units provided at both ends of the heat generating unit 2, reference numeral 5 denotes second electrode units provided at both ends of the temperature detecting unit 3, and reference numeral 6 denotes one of the electrode units 4 and 5. Except for the portion, it is an insulating layer which covers the heat generating portion 2 and the temperature detecting portion 3 as shown by a two-dot chain line in the figure. The first electrode part 4 and the second electrode part 5 are formed simultaneously with the formation of the heat generating part 2 and the temperature detecting part 3, respectively. The insulating layer 6 is formed by laminating the heat generating portion 2 and the temperature detecting portion 3 with a resin thin film sheet made of a non-conductive material to electrically insulate the heat generating portion 2 and the temperature detecting portion 3 from the outside.
And to protect the surface of the temperature detecting section 3.

The conductive material forming the heating section 2 and the temperature detecting section 3 is, for example, a sheet resistance of 20 m.
An Ag-based conductive material of Ω / cm ² (25 ° C.) is used. Said A
The g-based conductive material has a resistance temperature change characteristic of 3500 ppm / ° C.

The heating section 2 has a width of 2 mm and a length of 200 m.
m heating wires are connected to each other and connected to each other, and the resistance value between the first electrode portions 4 and 4 is set to about 40Ω (25 ° C.). The temperature detection unit 3 has a width of 0.5 mm and a length of 6 mm.
It is composed of 11 temperature detection wires of 0 mm and their connection parts, and the resistance value between the second electrode parts 5 and 5 is about 27 Ω (25
° C).

In the above configuration, when current is applied between the first electrode portions 4 and 4 provided at both ends of the heat generating portion 2 to generate heat and the temperature of the heat generating portion 2 becomes 80 ° C. The resistance value between the second electrode parts 5 and 5 of the temperature detecting part 3 is a temperature change 55 from the initial temperature of 25 ° C. to 80 ° C.
deg, that is, the resistance value increases by 19%.
By detecting the change in the resistance value, the temperature of the heating element 2 can be detected.

As described above, in the planar heating element of the present embodiment, the heating section 2 and the temperature detection section 3 each made of a conductive material are placed close to each other on the insulating sheet 1 which is a non-conductive base material. Since the heating section 2 and the temperature detection section 3 are formed by pattern printing, the temperature of the heating section 2 can be accurately detected by the temperature detection section 3. In addition, since the heating section 2 and the temperature detection section 3 are formed by pattern printing,
The heating unit 2 and the temperature detection unit 3 can be easily formed as compared with a sheet heating element using a metal foil requiring a conventional laminating step and a sheet heating element requiring a temperature detection unit separately. In addition, the manufacturing cost can be reduced. In addition, since the heat generating section 2 and the temperature detecting section 3 can be formed by thin films, the sheet heating element itself can be reduced in size as compared with a sheet heating element using metal foil, and the temperature detecting means can be used. The temperature detecting means can be made unnecessary as compared with a separately required sheet heating element, and the arrangement space for commodities using the sheet heating element can be reduced.

Further, since the heat generating portion 2 and the temperature detecting portion 3 are formed on the same surface of the insulating sheet 1, the heat generating portion 2 and the temperature detecting portion 3 can be formed at the same time, thereby simplifying the manufacturing process. Thus, the heat generating portion 2 and the temperature detecting portion 3 can be formed more easily, and the manufacturing cost can be further reduced.

Therefore, it is possible to provide an inexpensive sheet heating element that can accurately detect the temperature of the heating section 2 and that can reduce the size of a product using the sheet heating element.

In the first embodiment, a description has been given using a conductive material having a positive characteristic or a negative characteristic as the conductive material of the heat generating portion 2. However, a conductive material having a flat resistance temperature change characteristic is used instead. Materials may be used.

FIG. 3 is a plan view showing a planar heating element according to a second embodiment of the present invention.

The planar heating element according to the second embodiment of the present invention comprises:
Heat generated by pattern-printing a conductive material having positive or negative characteristics adjusted to have a predetermined resistance value on the same surface of a resin sheet (corresponding to a non-conductive substrate) 1 which is a non-conductive material And a temperature detecting section 3a for detecting the temperature of the heat generating section 2a, which is disposed close to and along the heat generating section 2a using the conductive material. In the figure, reference numeral 4 denotes a first electrode portion provided at both ends of the heat generating portion 2a, and reference numeral 5 denotes a second electrode portion provided at both ends of the temperature detecting portion 3a.
Reference numeral 6 denotes an electrode layer, which is an insulating layer which covers the heat generating portion 2a and the temperature detecting portion 3a except for a part of the electrode portions 4 and 5, as shown by a two-dot chain line in the figure. The first electrode part 4 and the second electrode part 5 are formed simultaneously with the formation of the heat generating part 2a and the temperature detecting part 3a, respectively. The insulating layer 6
Is formed by laminating the heat generating portion 2a and the temperature detecting portion 3a with a resin thin film sheet which is a non-conductive material to electrically insulate the outside and protect the surfaces of the heat generating portion 2a and the temperature detecting portion 3a. Things.

As the conductive material forming the heating section 2a and the temperature detecting section 3a, for example, a sheet resistance of 2
An Ag-based conductive material of 0 mΩ / cm ² (25 ° C.) is used.
The Ag-based conductive material has a resistance temperature change characteristic of 3500 ppm / ° C.

The heating section 2a has a width of 2.5 mm and a length of 2 mm.
Heating wires of 10 mm are connected to each other and connected to each other, and the resistance between the first electrode portions 4 and 4 is set to about 11 Ω (25
° C). The temperature detection unit 3a has a width of 0.5 m.
m and 10 mm of the temperature detection wire having a length of 200 mm and a connection portion therebetween, and the resistance value between the second electrode portions 5 and 5 is set to about 9
9 Ω (25 ° C.).

In the above configuration, the power is applied between the first electrode portions 4 and 4 provided at both ends of the heat generating portion 2a, thereby causing the heat generating portion 2a to generate heat.
° C, the second electrode portion 5 of the temperature detecting portion 3a
The resistance value between 5 changes by 55 degrees of temperature change from the initial temperature of 25 ° C. to 80 ° C., that is, the resistance value increases by 19%. By detecting the change in the resistance value, the temperature of the heating element 2a can be detected.

As described above, in the planar heating element of the present embodiment, since the temperature detecting section 3a is disposed along the heating section 2a, the temperature change of the heating section 2a is transmitted to the temperature detecting section 3a. More accurately. Further, similar to the first embodiment, a planar heating element that can accurately detect the temperature of the heating section 2a at low cost and that can reduce the size of a product using the planar heating element is provided. can do.

FIGS. 4A and 4B are views showing a planar heating element according to a third embodiment of the present invention, wherein FIG. 4A is a plan view and FIG. 4B is a rear view.

The planar heating element according to the third embodiment of the present invention comprises:
Unlike the conductive material having a low sheet resistance such as an Ag-based conductive material, the heat generating portion 2b has a sheet resistance of 20Ω.
/ Cm ^2, which is made of a carbon-based conductive material having a large sheet resistance such as / cm ² , and the heating portion 2b made of the carbon-based conductive material is printed in a pattern as described above because of its large sheet resistance. It is formed by printing on a plate.

More specifically, one surface of the resin sheet 1 which is a non-conductive material has a sheet resistance value of 20 Ω / cm.
^The heating section 2b is formed by printing a carbon-based conductive material of ² (25 ° C.) with a width of 100 mm and a length of 200 mm, and the first electrode sections 4 are formed at both ends thereof.
At this time, the resistance value between the electrode portions 4 and 4 is 40Ω (25
° C).

On the other hand, a sheet resistance of 20 mΩ is provided at a position corresponding to the heat generating portion 2 on the other surface of the resin sheet 1.
/ Cm ² (25 ° C.) by forming a band-shaped printing of an Ag-based conductive material, and forming a second
The electrode part 5 is formed.

The first electrode portion 4 and the second electrode portion 5 are formed simultaneously, similarly to the formation of the heat generating portion 2b and the temperature detecting portion 3b, respectively.

On both sides of the resin sheet 1, as shown by two-dot chain lines in the figure, except for a part of the electrode parts 4, 5, a resin thin film sheet made of a non-conductive material is laminated. An insulating layer 6 is provided to electrically insulate the heat generating portion 2b and the temperature detecting portion 3b from the outside and protect the surface.

With this configuration, it is possible to detect a temperature rise at the time of energization of the heat generating portion 2b by increasing the resistance value of the temperature detecting portion 3b via the resin sheet 1.

As described above, in the planar heating element of the present embodiment, the heat generating portion 2b is disposed on one surface of the insulating sheet 1 and the heat generating portion 2b is formed on the other surface of the insulating sheet 1. Since the temperature detecting section 3b is disposed at a position corresponding to the section 2b, the temperature change of the heat generating section 2b can be detected more accurately by the temperature detecting section 3b. Moreover,
As in the first embodiment, it is possible to provide a planar heating element that can accurately detect the temperature of the heating section 2b at low cost and that can reduce the size of a product using the planar heating element. Can be.

In the first to third embodiments described above, a resin sheet is used as the non-conductive substrate, but a non-conductive substrate may be used instead.

[0041]

As described above, according to the first aspect of the present invention,
According to the planar heating element described above, a heating section and a temperature detection section each made of a conductive material are disposed close to each other on a non-conductive substrate, and the heating section and the temperature detection section are formed by printing. Therefore, the temperature of the heat generating unit can be accurately detected by the temperature detecting unit. In addition, since the heating section and the temperature detection section are formed by printing, the sheet heating element using a metal foil that requires a conventional laminating step and the sheet heating element that requires a temperature detection means are required as compared with the sheet heating element that is separately required. The heat generating portion and the temperature detecting portion can be easily formed, and the manufacturing cost can be reduced. In addition, since the heat generating portion and the temperature detecting portion can be formed of a thin film, the size of the sheet heating element itself can be reduced as compared with a sheet heating element using metal foil, and a separate temperature detecting means is required. The temperature detecting means can be dispensed with as compared with a simple sheet heating element, and the space for arranging products using the sheet heating element can be reduced.

Accordingly, it is possible to provide a planar heating element which can be inexpensively performed, accurately detect the temperature of the heating section, and which can reduce the size of a product using the planar heating element. Further, the planar heating element according to claim 2 of the present invention,
In the planar heating element according to claim 1, since the heating section and the temperature detection section are formed on the same surface of the non-conductive substrate,
The heat generating portion and the temperature detecting portion can be formed at the same time, and the heat generating portion and the temperature detecting portion can be formed more easily by simplifying the manufacturing process, thereby further reducing the manufacturing cost. .

Further, in the sheet heating element according to the third aspect of the present invention, in the sheet heating element according to the second aspect, the temperature detecting portion is disposed along the heat generating portion. The temperature change can be more accurately detected by the temperature detector.

In addition, the sheet heating element according to a fourth aspect of the present invention is the sheet heating element according to the first aspect, wherein the heat generating portion is disposed on one surface of the non-conductive base material. Since the temperature detection unit is provided at a position corresponding to the heat generation unit on the other surface of the non-conductive base material, the temperature change of the heat generation unit can be more accurately detected by the temperature detection unit. it can.

[Brief description of the drawings]

FIG. 1 is a plan view showing a sheet heating element according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a plan view showing a planar heating element according to a second embodiment of the present invention.

FIGS. 4A and 4B are diagrams showing a planar heating element according to a third embodiment of the present invention, wherein FIG. 4A is a plan view and FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin sheet (non-conductive base material) 2, 2a, 2b Heating part 3, 3a, 3b Temperature detecting part 4 First electrode part 5 Second electrode part 6 Insulating layer

Claims (4)

[Claims] 1. A heating section and a temperature detection section each made of a conductive material are disposed close to each other on a non-conductive substrate, and the heating section and the temperature detection section are formed by printing. And a sheet heating element. 2. The planar heating element according to claim 1, wherein said heat generating portion and said temperature detecting portion are formed on the same surface of said non-conductive base material. 3. The planar heating element according to claim 2, wherein said temperature detecting section is arranged along said heat generating section. 4. The heating unit is provided on one surface of the non-conductive base material, and the temperature detection unit is provided at a position corresponding to the heating unit on the other surface of the non-conductive base material. The planar heating element according to claim 1, wherein the heating element is provided.