JPS6259869B2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a surface heating element.

A surface heating element usually consists of a heating circuit pattern formed by printing or etching on metal foil, sandwiched between two insulating films, and is used in large-area heaters such as electric carpets. There is. However, recently, there has been a demand for devices that can switch the area of use for energy savings and the like.

As shown in FIG. 1, this type of conventional surface heating element is composed of two unit heating elements 3 and 4 having two unit heating circuit patterns 1 and 2 that are continuous in the longitudinal direction. A conductive wire pattern 1a, 2a in which patterns 1 and 2 are connected to each other by extending in the longitudinal direction on one side of the unit surface heating elements 3 and 4, and a conductive wire pattern extending in the lateral direction on one end of the unit surface heating elements 3 and 4. Conductive wire patterns 1b, 2b connected to 1a, 2a
and a heating wire pattern 1 provided in the central part of the unit surface heating elements 3 and 4 and connected to the conductive wire patterns 1b and 2b.
c, 2c, a T-shaped cut 5 is made from the other side of the unit surface heating elements 3, 4 at the joining part of the unit surface heating elements 3, 4, and the remaining part of the cut 5 is made as shown in FIG. The part 5A is folded back to make one side of the unit surface heating element 3 and one side of the unit surface heating element 4 face each other, and the corner of the rectangle after folding (a place that does not get in the way during use) is
The corner of one end of the unit surface heating element 3 corresponding to the other side is cut and removed to form the conductive wire pattern 1b and the heating wire pattern 1.
part A and part B are punched out, and lead wires 6,
7 to form a terminal section, and these lead wires 6,
Power can be individually supplied to the heat generating line patterns 2c and 1c through the power line 7, so that the heat generating area can be switched. In addition, in FIG. 2, the broken line portion does not form a heat generating circuit and is in a non-heat generating state.

In such a conventional surface heating element, the heating wire pattern 1c is directly connected to the lead wire 7, whereas the heating wire pattern 2c is connected to the conductive wire patterns 1b, 1a,
2b, the resistance value of the heating circuit seen from the lead wire 6 and the resistance value of the heating circuit seen from the lead wire 7 are different, and as a result,
There was a problem in that the watt densities of the surface heating elements 3 and 4 were different and the heat generation temperatures of the surface heating elements 3 and 4 were different.

Another conventional surface heating element includes a unit surface heating element 9 having a heating circuit pattern 8 as shown in FIG.
A heating circuit pattern 10 consisting of a heating wire pattern 10a and a conductive wire pattern 10b as shown in the figure.
used in combination with a unit surface heating element 11 having
The end of the heating circuit pattern 8 and the conductive wire pattern 10
Lead wires 12 and 13 are respectively connected to the ends of b, and the terminal portions to which the lead wires 12 and 13 are connected are located at the corners of the rectangle when the unit surface heating elements 9 and 11 are combined.

Since this surface heating element uses two different unit surface heating elements 9 and 11, the heating circuit pattern 8,
The shape of 10 allows the unit surface heating elements 9 and 11 to have the same watt density and equal heat generation temperature.
Two types of heating circuit patterns 8 and 10 are required, and the connection of the lead wires 12 and 13 must be performed individually for the unit surface heating elements 9 and 11, which has the drawback of increasing manufacturing costs.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a surface heating element in which the terminal portion does not get in the way, the difference in heat generation temperature between two heat generation areas can be reduced, and the manufacturing cost can be reduced.

An embodiment of this invention is shown in FIGS. 5 and 6. That is, as shown in FIG. 5, this surface heating element is composed of two unit heating elements 1 having two unit heating circuit patterns 14 and 15 continuous in the longitudinal direction.
Consisting of 6 and 17, unit heat generating circuit pattern 1
4 and 15 were provided at the center of the conductive wire patterns 14a and 15a extending in the transverse direction and the unit surface heating elements 16 and 17, and connected to one end of the conductive wire patterns 14a and 15a. Heating line patterns 14b, 15b and unit surface heating elements 16, 17
A heating line pattern 14 extends in the longitudinal direction at the other end.
Conductive wire pattern 14c, 1 connected to b, 15b
5c and shorting line patterns 14d, 14e, which short-circuit both ends of the heating line patterns 14b, 15b, respectively.
15d and 15e, and the conductive wire pattern 14c and the other end of the conductive wire pattern 15a are configured in a connected state. A T-shaped cut 18 is made, and as shown in FIG. The corner of one end of the unit surface heating element 17 corresponding to the corner of the rectangle (a place that does not get in the way during use) and the other side are cut and removed to form the conductive wire pattern 15a.
and the heating line pattern 15b are separated, the shorting line pattern 15d is removed, and the shorting line pattern 14e is further punched and removed, and the conductive line pattern 15a and the heating line pattern 15 are separated at the separated part.
Lead wires 19 and 20 are connected to the terminals b, respectively, to form terminal portions, and power can be individually supplied to the heating wire patterns 14b and 15b through these lead wires 19 and 20, so that the heating area can be switched. In addition, in FIG. 6, the broken line portion does not form a heat generating circuit and is in a non-heat generating state.

The surface heating element of this embodiment has a heating line pattern 15.
b is directly connected to the lead wire 20, whereas the heating wire pattern 14b is connected to the conductive wire patterns 15a, 1
4c, the difference between the resistance value of the heating circuit seen from the lead wire 19 and the resistance value of the heating circuit seen from the lead wire 20 is smaller than in the conventional example, Unit surface heating element 16,1
7, the unit surface heating element 1 becomes smaller.
The difference in heat generation temperature between 6 and 17 can be reduced. Incidentally, if the line width of the conductive line patterns 14a, 14c, 15a, 15c is made thicker than the line width of the heating line patterns 14b, 15b, the difference in watt density between the unit surface heating elements 16, 17 can be made much smaller. Further, by making the conductive wire patterns 14a, 15a as large as possible and making the conductive wire patterns 14c, 15c as small as possible, the unit surface heating elements 16, 1
The difference in watt density of 7 can be reduced.

On the other hand, since this surface heating element only needs to be manufactured with one type of pattern, the number of printing rolls etc. can be reduced, and the lead wires 19 and 2 at the terminal portion can be reduced.
0 connection processing can be performed simultaneously on the unit surface heating elements 16 and 17, and therefore manufacturing costs can be reduced.

In addition, in the embodiment, two unit surface heating elements 16, 1
Although the surface heating element is constructed using 7, the number is not limited to two, and may be an even number.

Another embodiment of the invention is shown in FIG. That is, this surface heating element is composed of unit surface heating elements 24, 25, 26 having three unit heating circuit patterns 21, 22, 23 continuous in the longitudinal direction, and the unit heating circuit patterns 21, 22, 23 are arranged as a unit. Heat generating line patterns 21a, 21b, 22a, 22b, 23a, 2 provided at both ends of the surface heating elements 24, 25, 26
3b and heating line patterns 21a, 21b, 22a,
Conductive wire patterns 21c, 22c, 23c and heating wire patterns 21a, 21b, 22a, 22b, 2 whose both ends are connected to 22b, 23a, 23b, respectively
Short-circuit line pattern 2 that short-circuits the ends of 3a and 23b
1d, 21e, 22d, 22e, 23d, 23e
A T-shaped notch 27 is made in the central unit surface heating element 25, and the conductive wire pattern 22c and the heating wire pattern 22 are folded back in the same manner as in the previous embodiment.
The connecting portion b is separated to form a terminal portion.

The effects of this embodiment are similar to those of the previous embodiment.

In this embodiment, three unit surface heating elements 24 to
Although the surface heating element is constructed with 26, the number is not limited to three and may be an odd number.

As described above, the surface heating element of the present invention has first and second heating line patterns formed side by side in the longitudinal direction, and a heating line pattern formed between the first and second heating line patterns in the width direction. a conductive wire pattern that extends and has one end and the other end connected to the first and second heating wire patterns, respectively; A cut is made in the transverse direction from the side close to one end of the conductive line pattern, and the remaining portions of the cut are made between both side parts of the conductive line pattern on the side close to the other end of the conductive line pattern in the longitudinal direction. Since the conductive wire pattern and the second heat generating wire pattern are separated to form a terminal portion by folding back and facing each other, the terminal portion does not get in the way and the difference in heat generation temperature between the two heat generating regions can be reduced. Moreover, it has the effect of reducing manufacturing costs.

[Brief explanation of the drawing]

1 and 2 are plan views of conventional surface heating elements, FIGS. 3 and 4 are plan views of other conventional surface heating elements, and FIGS. 5 and 6 are respectively plan views of conventional surface heating elements. A plan view of a surface heating element of one embodiment,
FIG. 7 is a plan view of another embodiment of the invention. 14, 15...Unit heating circuit pattern, 14a,
15a... Conductive line pattern, 14b, 15b... Heat generating line pattern, 14c, 15c... Conductive line pattern,
16, 17...Unit surface heating element, 18...Notch, 1
9, 20...Lead wire.

Claims (1)

[Claims] 1 first and second heating line patterns formed side by side in the longitudinal direction; and a heating line pattern formed between the first and second heating line patterns and extending in the lateral direction, one end and the other end of which are respectively connected to the first heating line pattern. and the second
a conductive wire pattern connected to a heating wire pattern, and a conductive wire pattern is provided between the conductive wire pattern and the first heating wire pattern in a lateral direction from a side close to one end of the conductive wire pattern in the longitudinal direction. A cut is made so that both side portions of the conductive wire pattern on the side near the other end of the conductive wire pattern in the longitudinal direction are made to face each other by folding back the remaining portion of the cut, and the conductive wire pattern and the first conductive wire pattern are made to face each other. A surface heating element that is separated from the second heating wire pattern to form a terminal part.