JPH1140328A - Ptc surfaced heating element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use power source of high voltage stably by forming an electrode layer respectively on PTC heating element layers separately-formed at a plurality of areas on an insulating base material, and providing an intermediate electrode layer for bridging two PTC heating element layers at equal intervals as the respective electrode layers. SOLUTION: PTC heating element layers 3, 3, are formed on a insulating film 2, for example, which are separated at two positions and meet the power source voltage of 100 V. The first and second electrode layers 4, 5 consisting of a plurality of comb-teeth shaped pattern are formed, which extend from a main pattern at equal intervals facing each other to the right and left. An intermediate electrode layer 6 is formed, which consists of the main pattern formed along a slot 2a at a part where the PTC heating element layer 3 is not formed in the central part of the insulating film 2, and the comb-teeth shaped pattern extending to the right and left from it at equal intervals between the respective comb-teeth patterns of the electrode layers 4, 5. It is thus possible to obtain a PTC surfaced heating element 1 which can be used by applying high voltage of 200 V to the electrode layers 4, 5 from a power source 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PTC planar heating element used for floor heating or wall heating.

[0002]

2. Description of the Related Art As shown in FIG. 4, a conventional PTC planar heating element 13 has a PTC heating element layer 3 formed on an insulating film 2 made of polyester (PET) or the like.
The first electrode layer 4 and the second electrode layer 5 were pattern-formed on the C heating element layer 3. The PTC heating element layer 3 is made of PTC
The ink is formed on the insulating film 2 by screen printing. PTC ink is a conductive ink that has PTC ([Positive Temperature Coefficient]) characteristics by dispersing carbon and thermal semiconductor in a resin matrix that serves as a binder. Since the resistance value also increases, a self-temperature control function capable of automatically maintaining a constant temperature without using an external temperature control device is provided. The first electrode layer 4 and the second electrode layer 5 are respectively formed by the PT
It is a highly conductive electrode layer formed in a comb-like pattern on the C heating element layer 3, and the comb-like patterns are arranged at substantially equal intervals. Each of the first electrode layer 4 and the second electrode layer 5 has a lead wire 7.
Is connected to the power supply 8 via the. Therefore, the voltage of the power source 8 is applied to the PTC heating element layer 3 between the comb-shaped patterns of the first electrode layer 4 and the second electrode layer 5 to conduct electricity. By this energization, the planar PTC heating element layer 3 can be heated at a constant temperature.

In the PTC heating element layer 3, it is necessary to change the composition of the PTC ink such as carbon and thermal semiconductor in accordance with the voltage of the power supply 8. Further, the first electrode layer 4 and the second electrode layer 5
It is necessary to set the distance between the respective comb-tooth-shaped portions to a distance corresponding to this voltage. Conventionally, PTC inks having compositions corresponding to the power supply 8 of 12V, 24V and 100V have been put to practical use.

[0004]

However, the above-mentioned PTC
When the planar heating element 13 is used for floor heating or heating from a wall surface, a relatively large amount of power is consumed. Therefore, there is a demand to use a 200 V power supply 8 supplied with a single-phase three-wire system. However, when such a high pressure is applied, the PTC characteristics of the PTC heating element layer 3 are likely to be unstable, which may cause overheating or thermal runaway. It is difficult to do. For this reason, the conventional PTC planar heating element 13 is
There is a problem that it can be used only with a power supply 8 having a relatively low voltage of 00 V or less.

The present invention has been made in view of the above circumstances, and forms a PTC heating element layer in a plurality of regions, and connects the PTC heating element layers in each region in series via an intermediate electrode layer. Accordingly, it is an object of the present invention to provide a PTC planar heating element that can use a high-voltage power supply.

[0006]

That is, in order to solve the above problems, a PTC planar heating element of the present invention is a PTC heating element formed on a planar insulating substrate and divided into a plurality of regions. A first electrode layer patterned on a region of any of the PTC heating element layers, and a second electrode layer patterned on a region of the PTC heating element layer other than the region where the first electrode layer is formed. An electrode layer and two electrode layers each having only one electrode layer.
An intermediate portion which is formed so as to bridge the area of the PTC heating element layer at a location, and is formed on both the areas of the PTC heating element layer so as to be substantially equidistant from the pattern of the electrode layer on each of the areas. And an electrode layer.

According to the means, the first electrode layer and the intermediate electrode layer face each other on the region of any of the PTC heating element layers. Further, on the region of another PTC heating element layer, this intermediate electrode layer and another intermediate electrode layer face each other, and two intermediate electrode layers sequentially face each other on the region of each PTC heating element layer. Then, on the region of the last PTC heating element layer, the last intermediate electrode layer and the second electrode layer face each other. Therefore, the PTC heating element layers in each region are sequentially connected in series via these intermediate electrode layers, so that the power supply voltage applied between the first electrode layer and the second electrode layer is reduced by the PTC heat generation in each region. The voltage can be divided by the body layer, and a high-voltage power supply that is an integral multiple of this can be used despite the use of a low-pressure PTC heating element layer. Here, the term “electrode layer” simply means any one of the first electrode layer, the second electrode layer, and the intermediate electrode layer.

The PTC heating element layer is formed on the insulating substrate in two separate areas, and the first electrode layer is formed on one PTC heating element layer. A second electrode layer is formed on the area of the other PTC heating element layer, and the intermediate electrode layer is formed on the one PTC heating element layer and the other PTC heating element layer.
It is characterized in that it is formed so as to bridge the area of the heating element layer.

The above means shows that the PTC heating element layer is formed separately in only two regions in this case, and in this case, only one intermediate electrode layer forms the PTC heating element layer in these two regions. It is formed so as to bridge the region of the body layer. When the two regions of the PTC heating element layer are connected in series via one intermediate electrode layer in this manner, a voltage twice as large as the voltage applied to each PTC heating element layer can be supplied from the power supply. become.

Further, each of the electrode layers is formed in a comb-like pattern so as to mesh with the other electrode layer at substantially equal intervals on the region of the PTC heating element layer. I do.

According to the means, the two electrode layers are made of PTC.
Since the pattern is formed by meshing in a comb-like manner on the region of the heating element layer, the PTC heating element layer having a large area can be divided at relatively small predetermined intervals to efficiently conduct electricity.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show an embodiment of the present invention. FIG. 1 shows the structure of a PTC heating element layer and an electrode layer formed on an insulating film of a PTC planar heating element. FIG. 2 is a perspective view showing the structure of a PTC planar heating element, and FIG. 3 is a plan view showing an equivalent circuit using a conventional PTC planar heating element. Components having the same functions as those of the conventional example shown in FIG. 4 are denoted by the same reference numerals.

In this embodiment, a PTC planar heating element 1 formed by separating a PTC heating element layer 3 into two regions will be described. The PTC planar heating element 1 has a PTC heating element layer 3 formed on an insulating film 2 as shown in FIG. The insulating film 2 has a vertically elongated slit-shaped long hole 2 in the center of a vertically elongated rectangular polyester film.
a is formed. The long hole 2a is for fitting to the projection at the mounting position when the PTC planar heating element 1 is installed, and is not necessarily provided when another mounting method is used. The PTC heating element layer 3 includes
It is formed separately from each other in two regions on the left and right, with a certain interval in the center along the line a. These PTC heating element layers 3 are also formed with a certain gap in the vicinity of the left and right edges of the insulating film 2. The pattern formation of the PTC heating element layer 3 is performed by P
It can be formed by screen-printing the TC ink on the insulating film 2. PTC inks are made by dispersing conductive fillers such as carbon microbeads in a resin matrix such as silicone resin as a binder to give PTC characteristics. One having resistance characteristics is used. In the present embodiment, a PTC ink having a composition corresponding to a power supply voltage of 100 V is used.

On the insulating film 2 on which the PTC heating element layer 3 is formed, a first electrode layer 4, a second electrode layer 5, and an intermediate electrode layer 6 are further pattern-formed. These electrode layers 4
Nos. 6 to 6 are patterns formed by screen-printing a good conductive silver paint or the like on the insulating film 2 or the PTC heating element layer 3. Here, a description will be given of a case where the PTC heating element layer 3 is formed on the insulating film 2 and then the electrode layers 4 to 6 are pattern-formed. The heating element layer 3 can also be formed.

The first electrode layer 4 includes a thick main line pattern formed along the periphery of the left half of the insulating film 2,
A plurality of comb teeth formed to extend rightward at equal intervals from this main line pattern along the left end side where the TC heating element layer 3 is not formed and overlap the PTC heating element layer 3 in the left area. Pattern. The second electrode layer 5 is formed from a thick main line pattern formed along the peripheral edge of the right half of the insulating film 2 and a main line pattern along the right end side where the PTC heating element layer 3 is not formed. It consists of a plurality of comb-shaped patterns that extend to the left at intervals and are formed on the PTC heating element layer 3 in the area on the right. Terminal portions are formed in the first electrode layer 4 and the second electrode layer 5 near the center of the lower end of the trunk line pattern, respectively, and are connected to a 200 V power supply 8 via a lead wire 7.

The intermediate electrode layer 6 is composed of a thick trunk pattern formed in a portion where the PTC heating element layer 3 is not formed along the center of the insulating film 2 and the periphery of the long hole 2a. It extends in the left-right direction and P
It is composed of a plurality of comb-like patterns formed on the TC heating element layer 3 respectively. Further, the respective comb-like patterns of the intermediate electrode layer 6 are formed so as to mesh at equal intervals between the respective comb-like patterns of the first electrode layer 4 and the second electrode layer 5.

As shown in FIG. 2, the insulating film 2 is provided on the surface on which the PTC heating element layer 3 and the electrode layers 4 to 6 are formed.
Polyester film 9 and urethane foam 1 of the same shape
In addition, the PTC sheet heating element 1 is completed by attaching the adhesive layer 11 on the back surface and covering the back surface with the separator 12. Polyester film 9 is PTC heating element layer 3
And the electrode layers 4 to 6 are insulated and sealed between the insulating film 2 and the insulating layer 2. The urethane foam 10 is a heat insulating layer. If the separator 12 on the back side is peeled off, this P
The TC planar heating element 1 can be attached and fixed to the installation position by the adhesive layer 11.

The PTC sheet heating element 1 having the above-described configuration is provided with a power supply 8
When a voltage of 200 V is applied through the lead wire 7 from the main line pattern of the first electrode layer 4, each of the comb-shaped patterns, the PTC heating element layer 3 in the left region and the respective comb teeth on the left side of the intermediate electrode layer 6 From the trunk pattern of the intermediate electrode layer 6 to the respective comb-teeth patterns on the right side, the PTC heating element layer 3 in the right region, the respective comb-teeth patterns of the second electrode layer 5 and the trunk pattern via the main pattern. AC current flows. Therefore, the PTC heating element layer 3 in the left region arranged between each comb-like pattern of the first electrode layer 4 and each comb-like pattern on the left side of the intermediate electrode layer 6 and the right side of the intermediate electrode layer 6 Is connected in series with the PTC heating element layer 3 in the right region arranged between each comb-shaped pattern of the second electrode layer 5 and each comb-shaped pattern of the second electrode layer 5. That is, as shown in FIG. 3, the PTC planar heating element 1 of the present embodiment is a conventional 100 V PT.
This is equivalent to connecting two C-plane heating elements 13 in series, and the voltage of 200 V applied from the power supply 8
Each of the two PTC heating element layers 3 of the PTC heating element 1 of the present embodiment has a voltage of 100 V so that the voltage is divided by the TC sheet heating element 13 and a voltage of 100 V is applied.
A voltage of V is applied. In this way, the conventional PTC planar heating element 13 can be connected in series using the lead wire 7 in this case. Become.

As described above, the PTC of this embodiment
According to the planar heating element 1, the PTC heating elements 3 formed separately on the insulating film 2 at two locations are connected in series via the intermediate electrode layer 6. Layer 3
, A voltage obtained by dividing the voltage of the power supply 8 by half is applied. Therefore, 100 V is applied to the PTC heating element layer 3.
Therefore, the use of a high-voltage power supply does not impair stability and safety, and power is supplied by a single-phase three-wire system.
Since the power supply 8 of 0 V can be used, even when the power supply 8 is used for floor heating or the like which consumes relatively large power, the waste of power does not increase.

In the above embodiment, the intermediate electrode layer 6 is in a floating state without being connected to the outside. However, a terminal portion is also provided here to allow the first electrode layer 4 and the second electrode layer 5 to be connected to each other. If a 100V power supply is connected between them, two PTCs
The heating element layer 3 can also be used as a 100 V PTC sheet heating element 1 connected in parallel.

In the above embodiment, each of the electrode layers 4 to 6
Are provided with a comb-like pattern, respectively, but the PT
Other patterns can be used as long as the patterns of the pair of electrode layers 4 to 6 formed on the C heating element layer 3 face each other at substantially equal intervals.

Further, in the above embodiment, the PTC heating element layer 3 is formed at two places. However, the PTC heating element layer 3 is formed at three or more places, and the intermediate electrode layer 6 is also provided between these PTC heating element layers 3. Providing two or more places makes it possible to support a higher-voltage power supply.

[0024]

As is apparent from the above description, according to the PTC planar heating element of the present invention, the PTC heating element layers in each region are connected in series via the intermediate electrode layer in order, so When the PTC heating element layer is used, a high-voltage power of an integral multiple of the PTC heating element layer can be supplied.

[Brief description of the drawings]

FIG. 1 illustrates one embodiment of the present invention, wherein a PT
It is a top view showing composition of a PTC heating element layer and an electrode layer formed on an insulating film of a C plane heating element.

FIG. 2 illustrates an embodiment of the present invention, wherein PT
It is a perspective view which shows the structure of a C plane heating element.

FIG. 3, showing an embodiment of the present invention, is a plan view illustrating an equivalent circuit using a conventional PTC planar heating element.

FIG. 4 is a plan view showing a conventional example and showing a configuration of a PTC heating element layer and an electrode layer formed on an insulating film of a PTC sheet heating element.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 PTC heating element 2 Insulating film 3 PTC heating element layer 4 First electrode layer 5 Second electrode layer 6 Intermediate electrode layer

Claims (3)

[Claims] 1. A PTC heating element layer formed separately on a planar insulating base material in a plurality of regions; a first electrode layer patterned on any of the PTC heating element layer regions; The second electrode layer patterned on the area of the PTC heating element layer other than the area where the first electrode layer is formed, and the areas of the two PTC heating element layers where only one electrode layer is formed, respectively. It is formed to be bridged, and both PTCs
A PTC having an intermediate electrode layer formed on the region of the heating element layer so as to be substantially equidistant from the pattern of the electrode layer on the region.
Sheet heating element. 2. The PTC heating element layer is formed separately on an insulating base material in two regions, and the first electrode layer is formed on one PTC heating element region. 2
The electrode layer is formed on the area of the other PTC heating element layer, and the intermediate electrode layer is formed so as to bridge over the area of the one PTC heating element layer and the area of the other PTC heating element layer. 2. The PTC planar heating element according to 1. 3. Each of the electrode layers is formed in a comb-like pattern on the region of the PTC heating element layer so as to mesh with the other electrode layer at substantially equal intervals. The PTC planar heating element according to claim 1 or 2.