JPH0673892U - Planar heater - Google Patents

Abstract

(57) [Summary] [Structure] A plurality of heat generating members 3 including a heat generating member composed of a positive temperature coefficient thermistor and a heat radiating member 2 are sandwiched between a pair of sheets 1 and 11 having substantially the same size. Then, the heat generating members 3 and the heat radiating member 2 are sealed at predetermined positions by adhering the peripheral edge portions 1a and 11a of the above-described sheets 1 and 11 and the sheets 1 and 11 and the heat generating member 3 are sealed. ... and the heat dissipation member 2 are in close contact with each other. The sheets 1 and 11, the heat dissipation member 2, and the terminal member 15 have flexibility. [Effect] The plurality of heat generating members and the heat radiating member can be insulated at a time, and the number of parts and the number of steps can be reduced. Since so-called unitization is possible,
The installation process / method on the object to be heated becomes easy, and
It can be done in a short time. It becomes possible to easily attach it to an object to be heated having a curved surface portion.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a planar heater having a PTC (Positive Temperature Coefficient) characteristic that can be used in many application fields such as a constant temperature heater or a local heating heater and using a heating element made of, for example, barium titanate-based porcelain semiconductor. It is a thing.

[0002]

[Prior art]

 Conventionally, as a planar heater, for example, a nichrome wire is sandwiched between insulating plates such as mica, a metal heating element is printed on the surface of a high-density alumina plate, or a surface of a heat-resistant polymer film is used. Those coated with exothermic paint such as carbon are known.

However, in each of the above-mentioned sheet heaters, 1) a control circuit for keeping the heat generation temperature constant is required, 2) a circuit for preventing overheat is required, and 3) design of a print pattern or the like of a heat generation portion. Was causing the problem of complexity.

Therefore, as a means for avoiding the above problems, a planar heater using a heating element made of a barium titanate-based ceramic semiconductor or the like, which is a positive temperature coefficient thermistor having a self-temperature control function, has been considered. In such a planar heater, electrodes are provided on both sides of the heating element, and these electrodes are insulated from the outside and the heat generated by the heating element is transferred to the outside, so that the surface (heating surface) is smooth. A case made of a molded article of ceramics such as alumina having excellent electric insulation, heat resistance, mechanical strength and thermal conductivity is provided so as to cover the heat generating body.

[0005]

[Problems to be solved by the device]

 However, in the above-described conventional planar heater, it is necessary to fix the heating element to the case made of a molded product of ceramics such as alumina, and therefore an adhesive agent or the like must be used. In addition, it is necessary to separately manufacture the case, which increases the number of parts and the number of steps for manufacturing the planar heater, and causes an increase in cost.

When a plurality of conventional planar heaters are attached to an object to be heated, each planar heater must be attached to the object to be heated. Therefore, the mounting process becomes complicated and it takes a long time. Furthermore, it is difficult to attach the above-mentioned conventional sheet heater to an object to be heated having a curved surface portion.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, a planar heater according to a first aspect of the present invention is a pair of electrically insulating members in which a plurality of heat generating members including a heat generating member made of a positive temperature coefficient thermistor have substantially the same size. The heat generating member is hermetically sealed by attaching the pair of electrically insulating sheets that are sandwiched between the heat insulating sheets and are overlapped with each other, and the pair of electrically insulating sheets and the heat generating member are in close contact with each other. It is characterized by being.

In order to solve the above-mentioned problems, the planar heater according to the second aspect of the present invention has a plurality of heat-generating members provided with a heat-generating member made of a positive temperature coefficient thermistor, and a heat-radiating member having substantially the same size. The heat generating member and the heat radiating member are sealed by sandwiching the peripheral portions of the pair of electrically insulating sheets that are sandwiched between the pair of electrically insulating sheets having a texture and are overlapped with each other. The electrically insulating sheet, the heat generating member and the heat radiating member are in close contact with each other.

[0009]

[Action]

 According to the configuration of claim 1, the plurality of heat-generating members including the heat-generating body made of the positive temperature coefficient thermistor are sandwiched between the pair of electrically insulating sheets having substantially the same size, and the pair of the heat-generating members are stacked. The heat generating member is sealed by attaching the electrically insulating sheet of. For this reason, it is possible to insulate a plurality of heat generating members at once, and even if the object to be heated is metal or the like, it can be attached, and the number of parts and the number of steps can be reduced. Further, by sealing a plurality of heat generating members, it is possible to form a so-called unit, so that the attaching process / method to the object to be heated becomes easy and can be performed in a short time.

Further, since the pair of electrically insulating sheets and the heat generating member are in close contact with each other, the heat conductivity from the heat generating member to the electrically insulating sheet is good and the pair of heat generating members are It can be fixed in place between electrically insulating sheets.

According to the second aspect of the invention, the plurality of heat-generating members having the heat-generating body made of the positive temperature coefficient thermistor and the heat-dissipating member are sandwiched between the pair of electrically insulating sheets having substantially the same size. The heat-generating member and the heat-dissipating member are hermetically sealed by adhering the peripheral portions of the pair of electrically insulating sheets that are mounted and overlapped. Therefore, it is possible to insulate a plurality of heat-generating members and heat-dissipating members at a time, and even if the object to be heated is metal or the like, it can be attached, and the number of parts and the number of steps can be reduced. In addition, since a so-called unit can be formed by sealing the plurality of heat-generating members and heat-dissipating members, the attaching process / method to the object to be heated can be facilitated and can be performed in a short time.

Further, since the pair of electrically insulating sheets, the heat generating member, and the heat dissipating member are in close contact with each other, the heat conductivity from the heat generating member to the heat dissipating member and the electrically insulating sheet is good, and the heat The member and the heat radiating member can be fixed at a predetermined position between the pair of electrically insulating sheets.

[0013]

【Example】

 [Embodiment 1] An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. In the following description, a planar heater provided with five heating members will be taken as an example.

As shown in FIGS. 1 and 2, the sheet heater according to the present embodiment is formed in a rectangular shape slightly smaller than the sheet 1, for example, on the back surface of a rectangular sheet 1 as an electrically insulating sheet. The heat dissipation member 2 is provided in a close contact state. A flat substantially cylindrical heat generating member 3 is provided in a close contact state at a predetermined position on the back surface of the heat radiating member 2, and the heat radiating member 2 and the heat generating member 3 are sealed on the back surface of the heat radiating member 2 ( A rectangular sheet 11 serving as an electrically insulating sheet is provided in a closely contacting manner so as to be sealed. The heat dissipation member 2 is made of a metal foil having excellent thermal conductivity and flexibility, for example, an aluminum foil.

As shown in FIGS. 4 and 5, the heat generating member 3 has a heating element 4, metal terminals 8 and 8, lead wires 9 and 9 serving as a power supply line, and an insulation formed of an electrically insulating material. It consists of case 10.

The heating element 4 is made of a material having a positive temperature coefficient (Positive Temperature Coefficient), for example, a ceramic semiconductor whose main raw material is barium titanate, and has a low resistance from room temperature to the Curie temperature Tc (rapid change temperature). However, it is a positive temperature coefficient thermistor as a heat sensitive element having a characteristic that the resistance value sharply increases when the Curie temperature T c is exceeded. Due to this characteristic, when a voltage is applied, the heating element 4 initially has a low resistance and a large current flows due to a low temperature. As a result, the temperature rapidly rises, while the temperature rises to the Curie level. When the temperature exceeds the temperature Tc, the resistance value sharply increases, so that the temperature does not rise above a certain temperature and the certain temperature is kept stable. That is, the heating element 4 can have a self-temperature control function. Therefore, the heat generating member 3 consumes less power, can omit the temperature control circuit and the overheat prevention circuit, and can be downsized. Further, there is no fear of ignition due to local overheating. Since the Curie temperature Tc of the heating element 4 can be arbitrarily set within the range of about 30 to 250 ° C. depending on the material composition, in the heating element 4 of this embodiment, the sheet 1 effective for heating an object to be heated is used. The Curie temperature Tc may be set in consideration of safety and power saving while achieving the above surface temperature.

The heating element 4 has a flat columnar shape, and has electrodes 4a and 4a formed by applying, for example, silver paint on the upper and lower surfaces thereof, as shown in FIG.

The metal terminal 8 has a circular flat plate shape having a diameter substantially equal to the outer diameter of the heating element 4. Further, each metal terminal 8 is formed with a power feeding portion 8a for connecting the lead wire 9. These power supply parts 8a, 8a are parallel to each other and extend in the direction in which the corresponding lead wires 9, 9 are introduced.

The electrical connection between the heating element 4 and the metal terminals 8 and 8 is made by attaching the electrode 4a of the heating element 4 and the metal terminal 8 with a conductive adhesive of epoxy / silver mixture, for example. Is being done. Further, the electric connection between the power feeding portions 8a and 8a and the lead wires 9 and 9 is made by, for example, soldering the corresponding lead wires 9 to the facing surfaces of the power feeding portions 8a and 8a.

The insulating case 10 is composed of an insulating case lower portion 10a, which is a covering substrate, and an insulating case upper portion 10b. The insulating case 10 covers the heat generating element 4 and the metal terminals 8 to hermetically seal them. Further, the insulating case 10 has a terminal portion on the metal terminal 8 side of the lead wires 9 and 9 so that the soldering portion of the lead wire 9 and the power feeding portion 8a of the metal terminal 8 is not subjected to a mechanical load and is not broken. It is also designed to cover.

The insulating case 10 has a heating element 4 and the like housed in an insulating case lower portion 10a which is pre-molded by injection molding or the like, and is installed in an injection molding die (not shown). The insulating case lower part 10a and the insulating case upper part 10b are integrally formed by injection-molding an electrically insulating material for the upper part 10b of the insulating case. As a result, the heating element 4 and the like are sealed and fixed inside the insulating case 10.

The insulating case 10 has a small thermal contraction rate, is excellent in thermal conductivity and mechanical strength, has heat resistance capable of withstanding the heat generation temperature of the heating element 4, and adheres to the coating material of the lead wires 9 and 9. It must have good properties, and is formed of, for example, a polymer alloy made of nylon, polypropylene, and glass. The insulating case 10 also has a waterproof property that prevents moisture such as water vapor from passing inside and an airtight property that prevents air from passing inside. The insulating case 10 may be made of the same material as the sheets 1 and 11, or may be made of a different material.

In the heat generating member 3 described above, the lead wires 9 are connected to the opposing surfaces of the power supply portions 8a of the metal terminals 8 and 8a, respectively, so that the outer surfaces of the metal terminals 8 and 8 are connected to each other. Does not cause unevenness due to the connection of the lead wires 9 and 9. Therefore, it is not necessary to provide the insulating case 10 with a thickness for absorbing the irregularities, and the insulating case 10, that is, the heat generating member 3 can be formed thin. As a result, the heat generating member 3 can be made smaller, lighter and thinner, and the heat generated by the heat generating body 4 can be efficiently transferred to the heat radiating member 2. Furthermore, since the flat metal terminal 8 is used, the contact area between the heat generating member 3 and the heat radiating member 2 can be increased to further improve the heat transfer efficiency.

The above-mentioned sheet 11 is formed to have substantially the same size as the sheet 1, and the peripheral portions 1a and 11a of the sheets 1 and 11 are in close contact with each other. The sheets 1 and 11 have a small heat shrinkage rate, excellent thermal conductivity and mechanical strength, and have electrical insulation and flexibility, and also have heat resistance capable of withstanding the heat generation temperature of the heat generating member 3, steam, etc. It must be waterproof and moisture-tight, and must have good adhesion to the coating material of the lead wires 9 and 9. It is made of plastics such as vinyl, polyethylene, polyethylene terephthalate and polyamide.

Further, on the front surface of the sheet 1, an adhesive layer 12 made of, for example, an adhesive or an adhesive tape, and a release paper (not shown) so that the sheet heater can be easily attached to an object to be heated. And are provided. The sheets 1 and 11 may be made of the same material, or may be made of different materials as long as they can be brought into close contact with each other. However, the sheet 1 is preferably made of a material or a thickness that can maintain the smoothness of the front surface, which is a heat dissipation surface, while the sheet 11 is a heat generating member so that it can be closely adhered to the heat generating members 3 and the heat dissipation member 2. Materials and thicknesses that can be easily deformed according to the shape such as 3 ... For example, depending on the size of the sheet heater to be manufactured, when polyvinyl chloride is used as the material of the sheets 1 and 11, for example, the thickness of the sheet 1 is about 2 mm and the thickness of the sheet 11 is about 0.5 mm. do it.

In order to electrically insulate the heat generating member 3 and the heat dissipating member 2 from the outside, the sheets 1 and 11 are formed by stacking the heat generating members 3 and the like by, for example, blister packaging. Wrapped in. That is, the sheet 11 is provided with a depression by heating vacuum or pressure forming so as to fill the heat-generating member 3 ..., and the depression side is covered with the sheet 1, and the peripheral portions 1a and 11a of the sheet 1 and 11 are formed. Are heat-sealed by, for example, high-frequency heating, ultrasonic welding, hot pressing, impulse heating, etc., or are adhered and sealed by an adhesive or a sealing agent. At this time, at the same time, in order to prevent air and moisture from remaining inside, insert a needle made of plastic, for example, through the gap between the peripheral edges 1a and 11a of the sheets 1 and 11 to be bonded, and use a decompression device such as a vacuum pump. Evacuate the air, etc., to create a vacuum (reduced pressure). Thus, the heat generating member 3 and the heat radiating member 2 can be insulated and waterproofed simultaneously, and the sheets 1 and 11, the heat generating member 3 and the heat radiating member 2 are brought into close contact with each other, and the heat generating member 3 and the heat radiating member 2 and The heat conductivity to the sheet 1 is improved, and the heat generating members 3 and the heat radiating member 2 are fixed at predetermined positions inside the laminated sheets 1 and 11. Therefore, it is not necessary to use an adhesive, bolts, nuts or the like in order to fix the heat generating members 3 ... At a predetermined position inside the sheets 1/11.

In this way, by adhering and sealing the peripheral edge portions 1a and 11a of the sheets 1 and 11, the plurality of heat generating members 3 and the heat radiating member 2 can be insulated at one time. For example, even if the object to be heated is metal or the like, it can be attached, and the number of parts and the number of steps of the planar heater can be reduced. Further, by sealing the plurality of heat generating members 3 ... And the heat radiating member 2, so-called unitization is possible, so that the attaching process / method to the object to be heated is facilitated and can be performed in a short time.

It should be noted that, instead of providing the depressions in the sheet 11 so as to fill the heat-generating members 3 ..., The depressions corresponding to the heat-generating members 3 are provided in the sheet 11 in advance by compression molding or the like. You may make it fit the heat generating member 3 ... etc. in this recess.

When the sheets 1 and 11 sufficiently maintain the insulation, waterproofness, and airtightness of the heating element 4 and the metal terminals 8 and 8, the insulating case 10 of the heating member 3 is omitted. May be. Further, depending on, for example, the size of the planar heater to be manufactured and the number of heat generating members 3 ..., If the heat generated by the heat generating elements 4 ... Can be directly transferred to the entire surface of the sheet 1, heat radiation is performed. The member 2 may be omitted. In these cases, it is possible to further reduce the size, weight and thickness of the planar heater.

As shown in FIG. 1, the lead wires 9 and 9 connected to each of the heat generating members 3 are connected to a power cord 18 via a terminal member 15, and an external power source is connected through the power cord 18. Is electrically connected to. Therefore, the heat generating members 3 are connected in parallel with each other. The lengths of the lead wires 9 may be appropriately set in consideration of the ease of handling the planar heater.

As shown in FIG. 3, the terminal member 15 includes a pair of flexible metal lead plates 17 between a pair of flexible elongated rectangular covering sheets 16 and 16. 17 is sealed. The electrical connection between the lead plates 17 and 17 and the lead wires 9 and 9 is made by soldering, for example, the tip portions 9a of the lead wires 9 corresponding to the lead plates 17 and 17, respectively. Further, the electrical connection between the lead plates 17, 17 and the power supply cord 18 is also made by, for example, soldering the corresponding tip portions 18a of the power supply cords 18 to the lead plates 17, 17.

The above covering sheets 16 and 16 are excellent in mechanical strength, have electrical insulation, and have waterproofness that prevents moisture such as water vapor from passing inside and airtightness that does not allow air to pass inside. , And good adhesion to the coating material of the lead wires 9 and 9 and the power cord 18, for example, flexible plastics such as polyvinyl chloride, polyethylene, polyethylene terephthalate, and polyamide. It is made of. The covering sheets 16 and 16 may be made of the same material as the sheets 1 and 11, or may be made of different materials. Then, the lead plates 17 and 17 are sealed inside the overlapped covering sheets 16 and 16 by a method similar to the method of sealing the peripheral edge portions 1a and 11a of the sheet 1.11, or by molding using a silicone resin or the like. . Therefore, the terminal member 15 is also thinned and is so-called unitized.

In the above configuration, when attaching the planar heater to the object to be heated, the front surface of the sheet 1 and the object to be heated are attached by the adhesive layer 12. If the object to be heated is a long object such as a rod or a tube, wrap the sheet heater around the object to be heated, and then lock the sheet heater with a wire, string, or vinyl tape. Good. At this time, the adhesive layer 12 may not be provided on the front surface of the sheet 1.

Since the planar heater having the above-mentioned structure uses the heat-generating member 3 having the heat-generating body 4 made of a positive temperature coefficient thermistor as the heat-generating means, the temperature rises rapidly after energization and reaches a predetermined temperature. It will keep the temperature. Therefore, the front surface of the sheet 1 quickly rises to a predetermined temperature, and the object to be heated can be heated quickly. For example, if the object to be heated is a mirror provided on a washbasin or a vanity, the anti-fog function should be added to the mirror to make it an anti-fog mirror that can be used near a high-humidity room such as a bathroom. be able to. Further, when the object to be heated is a water pipe, the water pipe can be provided with a function of preventing freezing. Further, since the sheets 1 and 11 and the heat dissipation member 2 are flexible, it is possible to easily attach the sheet heater to the object to be heated having the curved surface portion.

In the above embodiment, the planar heater has been described by taking the case where the five heat generating members 3 are used as an example, but the number of the heat generating members 3 is of course limited to the above five. However, it may be appropriately changed according to the size of the object to be heated. The shapes of the heating element 4 and the heating member 3 are not limited to the flat columnar shape described above, and may be various shapes such as a rectangular parallelepiped shape and a triangular prism shape. Further, the sheets 1 and 11, the heat-generating member 3, ...

Moreover, the arrangement and fixing positions of the heat-generating member 3 and the heat-dissipating member 2 inside the superposed sheets 1 and 11 are not limited to those in the above embodiment, and can be changed as appropriate. Is. Further, the shapes and sizes of the sheets 1 and 11 and the heat dissipation member 2 can be variously changed so as to have optimum shapes and sizes according to the shape and size of the object to be heated.

Further, in the above-described embodiment, the case where the heat generating member 3 including one heat generating member 4 is used has been described as an example, but the number of the heat generating members 4 provided inside the heat generating member is one. It is not limited to the above, but a plurality may be used. In this case, the number of heat generating elements 4 provided inside the heat generating member may be appropriately changed according to the size of the object to be heated and the like. If a heat generating member provided with a plurality of heat generating elements 4 is used, the number of lead wires 9 ... Can be reduced, so that the lead wires 9 ... Can be easily connected to the lead plates 17. The heating elements 4 provided in the heating member may be electrically connected in parallel with each other by, for example, a pair of metal terminals.

Second Embodiment Another embodiment of the present invention will be described below with reference to FIG. For convenience of explanation, members having the same functions as the members shown in the drawings of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The planar heater according to the present embodiment is provided with a terminal member 20 as shown in FIG. 6 instead of the terminal member 15, and the terminal member 20 is provided inside the sheets 1 and 11 which are overlapped. Is sealed in the vicinity of the peripheral portion. The terminal member 20 has the sheets 1 and 11 as a covering sheet, and when the peripheral portions 1a and 11a of the sheets 1 and 11 are sealed, these lead plates 17 and 17 are prevented from coming into contact with each other. It has a holding sheet 21 for keeping the distance between the plates 17 constant. The holding sheet 21 may be made of the same material as the sheets 1 and 11, or may be made of a different material. However, the holding sheet 21 may be omitted if the lead plates 17 are widely separated from each other and there is no risk of contact with each other. The heat dissipation member 2 is formed in a size corresponding to the object to be heated, and is sealed at a position where it does not come into close contact with the terminal member 20. Other configurations are the same as those of the first embodiment.

The planar heater configured as described above can achieve the same actions and effects as the planar heater of the first embodiment. That is, in the above-mentioned sheet heater, the peripheral portions 1a and 11a of the sheets 1 and 11 are adhered and hermetically sealed to insulate the plurality of heat generating members 3, ..., The heat radiating member 2 and the terminal member 20 at once. Since it can be performed, for example, even if the object to be heated is a metal or the like, it can be attached, and the number of parts of the planar heater and the number of steps can be further reduced. Further, by sealing the plurality of heat-generating members 3, the heat-dissipating member 2 and the terminal member 20, it is possible to form a so-called unit, so that the attaching process / method to the object to be heated becomes easy, and it should be performed in a short time. You can Furthermore, since the sheets 1 and 11, the heat dissipation member 2 and the lead plates 17 and 17 are flexible, it is possible to easily attach the planar heater to an object to be heated having a curved surface portion.

Moreover, in the planar heater having the above-mentioned configuration, the lead wires 9 ... Are sealed inside the seats 1 and 11 and are not exposed to the outside. Therefore, for example, when the planar heater is attached to an object to be heated, There is no risk that the wires 9 will be caught on other articles, and there will be no failure such as disconnection.

[Third Embodiment] The following description will explain still another embodiment of the present invention with reference to FIG. For convenience of explanation, members having the same functions as the members shown in the drawings of the first embodiment will be designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 7, the planar heater according to the present embodiment is provided such that the side surface portion of the terminal member 15 is in contact with the side surface portions of the seats 1/11. That is, the lead wires 9 ... Are formed to be shorter than the planar heater of the first embodiment described above. Incidentally, the side surface portion of the terminal member 15 and the side surface portions of the sheets 1 and 11 may be adhered with, for example, an adhesive or the like. The other structure is the same as that of the first embodiment.

The planar heater configured as described above can achieve the same actions and effects as the planar heater of the first embodiment. That is, in the above-described sheet heater, the plurality of heat generating members 3 ... And the heat radiating member 2 can be insulated at once by adhering and sealing the peripheral edge portions 1a and 11a of the sheets 1 and 11. For example, the object to be heated can be attached even if it is a metal or the like. Further, by sealing the plurality of heat-generating members 3, the heat-dissipating member 2 and the lead plates 17 and 17, so-called unitization is possible, which facilitates the attaching process / method to the object to be heated, and shortens the time. Can be done at. Furthermore, since the sheets 1/11, the heat dissipation member 2 and the lead plates 17/17 are flexible, it is possible to easily attach the planar heater to an object having a curved surface. .

Further, in the planar heater having the above-described configuration, the lead wires 9 ... Are short, so that when the planar heater is attached to the object to be heated, the lead wires 9 ... There is no fear, and there will be no failure such as disconnection.

[0046]

[Effect of device]

 As described above, in the planar heater according to the first aspect of the present invention, the plurality of heat generating members having the heat generating element made of the positive temperature coefficient thermistor are sandwiched between the pair of electrically insulating sheets having substantially the same size. The heat generating member is hermetically sealed by adhering the pair of electrically insulating sheets that are mounted and overlapped, and the pair of electrically insulating sheets and the heat generating member are in close contact with each other. is there.

With this, it is possible to insulate a plurality of heat generating members at a time, and even if the object to be heated is a metal or the like, it can be attached, and the number of parts and the number of steps can be reduced. Further, by sealing a plurality of heat generating members, so-called unitization becomes possible, so that the attaching process / method to the object to be heated becomes easy and the process can be performed in a short time. Furthermore, the heat conductivity from the heat generating member to the electrically insulating sheet is improved, and the heat generating member can be fixed at a predetermined position between the pair of electrically insulating sheets.

As described above, in the planar heater according to the second aspect of the present invention, the plurality of heat-generating members provided with the heat-generating body made of the positive temperature coefficient thermistor and the heat-dissipating member have substantially the same size. The heat-generating member and the heat-dissipating member are sealed by attaching the peripheral portions of the pair of electrically insulating sheets that are sandwiched between the pair of electrically insulating sheets to each other, and the pair of electrically insulating sheets are also sealed. The sheet, the heat generating member and the heat radiating member are in close contact with each other.

As a result, a plurality of heat-generating members and heat-dissipating members can be insulated at one time, and even if the object to be heated is metal or the like, it can be attached and the number of parts and the number of steps can be reduced. it can. Further, by sealing a plurality of heat-generating members and heat-dissipating members, so-called unitization is possible, so that the step / method of attaching to the object to be heated is facilitated and can be performed in a short time. Further, since the pair of electrically insulating sheets, the heat generating member and the heat radiating member are in close contact with each other, the heat conductivity from the heat generating member to the heat radiating member and the electrically insulating sheet is good and the heat generating member is Also, it is possible to fix the heat dissipation member at a predetermined position between the pair of electrically insulating sheets.

[Brief description of drawings]

FIG. 1 is a partially cutaway rear view of a sheet heater according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of the sheet heater shown in FIG.

3 is a cross-sectional view taken along the line BB of the planar heater shown in FIG.

FIG. 4 is a schematic front view showing a heat-generating member of the above-described sheet heater partially broken away.

FIG. 5 is a sectional view of the heat generating member.

FIG. 6 is a partially cutaway rear view of a sheet heater according to another embodiment of the present invention.

FIG. 7 is a partially cutaway rear view of a sheet heater according to still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 sheet (electrically insulating sheet) 1a peripheral part 2 heat dissipation member 3 heat generating member 4 heating element 8 metal terminal 9 lead wire 9a tip part 10 insulating case 11 sheet (electrically insulating sheet) 11a peripheral part 12 adhesive layer 15 terminal member 16 Cover sheet 17 Lead plate 18 Power cord 20 Terminal member

Claims (2)

[Scope of utility model registration request] 1. A pair of the electrically insulating sheets, wherein a plurality of heating members each having a heating element composed of a positive temperature coefficient thermistor are sandwiched between a pair of electrically insulating sheets having substantially the same size and stacked. A sheet heater, wherein the heat generating member is hermetically sealed by adhering the sheet, and the pair of electrically insulating sheets and the heat generating member are brought into close contact with each other. 2. A plurality of heat-generating members having a heat-generating body made of a positive temperature coefficient thermistor, and a heat-dissipating member sandwiched between a pair of electrically insulating sheets having substantially the same size, and the pair being superposed. The heat-generating member and the heat-dissipating member are hermetically sealed by adhering the peripheral portion of the electric-insulating sheet, and the pair of the electric-insulating sheet, the heat-generating member and the heat-dissipating member are in close contact with each other. A sheet heater.