JPS6322435B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The invention disclosed herein relates to a sheet heating element used in electric carpets and other heating devices.

BACKGROUND ART Conventionally, a planar heating element has been used which includes a heat generating printed wiring circuit serving as a heat generating wire section and a lead wire section on an insulating sheet such as an insulating film.

However, this conventional planar heating element had drawbacks as explained below.

In other words, printing machines are generally used in the process of printing heat generating printed wiring circuits for planar heating elements, but at present, due to limitations on the width of the printing machine and the diameter of the printing cylinder, printing with one rotation of the cylinder is not possible. It is difficult to print a heat generating circuit with a width and length of 900 mm or more. Therefore, in order to obtain a large planar heating element, the unit pattern of the heat generating printed wiring circuit is repeatedly printed. Therefore, it was necessary to print lead wire portions in order to connect the heating wires of adjacent unit patterns. Conventionally, this lead wire section was printed so that it was located at an intermediate position between the heat generating wire sections, and most of its line direction was perpendicular to the printing direction, while the heat generating wire section was printed so that most of its line direction was perpendicular to the printing direction. They were printed in the same direction.

By the way, in general, when printing lines extending perpendicular to the printing direction, it is necessary to make the line spacing wider than when printing lines in the printing direction. This is because if the doctoring of the ink is defective, that is, if the excess ink is not properly scraped off, there is a risk that lines will be printed with smeared lines. Normally, when perpendicular to the printing direction, the line spacing should be at least 5 to 7 mm. On the other hand, in the printing direction, the line spacing may be about 1 mm. Therefore, as mentioned above, the heating wire portion where most of the printing direction is located can have a high linear density, that is, the watt density (W/m ² ) can be increased to speed up the temperature rise, but the lead wire portion is It is not possible to increase the linear density in the same way as in the other parts, and the temperature rises slowly in these parts. Therefore, conventional planar heating elements had the disadvantage that the temperature varied greatly depending on the location.

Next, in a planar heating element, it is most convenient for use if the terminal portion, where the cord is attached, is gathered in one corner of the planar heating element, so it is preferable that such a request is satisfied.

The inventor conducted repeated research in an attempt to improve the above-mentioned drawbacks and to gather the terminal portions in one corner of the planar heating element, and finally completed the invention disclosed herein. That is, the invention disclosed herein provides a planar heating element in which the overall watt density is approximately uniform, the temperature is uniform, and the terminal portions are gathered in one corner. This will be explained below.

Both of the planar heating elements according to the two inventions disclosed herein include at least one heat generating printed wiring circuit that serves as a heating wire portion and a lead wire portion on an insulating sheet, and the heating printed wiring circuit is One of the lead wire parts reaches near the other end from one end of the insulating sheet along the printing direction on one side of the insulating sheet and is connected to one end of the heating wire part, and one of the lead wire parts The other wire reaches near the other end from one end of the insulating sheet along the printing direction between the one lead wire and the heating wire part, and then turns back and returns to near the one end of the insulating sheet. According to the first invention, a plurality of surface heating elements forming a U-shape and connected to the other end of the heating wire section are used, and these surface heating elements are arranged horizontally with the printing direction parallel to each other. A separation portion is formed in all of the plurality of surface heating elements except for one at the end by a slit formed inside the U-shaped lead wire from the opening toward the bottom. , the terminal portion of each surface heating element is gathered in this opening by directing this cut-off portion toward the opening of the U-shaped lead wire in the surface heating element at the end, the second invention. According to the above, one of the ends of the plurality of surface heating elements is cut off by a cutting line passing inside the U-shaped lead wire and reaching from one end of the surface heating element to the other end, In all the remaining parts, a cut-off part is created by a slit formed inside the U-shaped lead wire from the opening toward the bottom, and this cut-off part is connected to the U-shaped lead wire part of the surface heating element at the end. It is characterized in that the terminal portions of the heating elements on each side are gathered at the cut point by directing them toward the cut point, which was the bottom of the letter shape. These inventions will be explained in detail below.

The surface heating elements used in the first invention and the second invention can be easily mass-produced and can be freely obtained in a desired size by using, for example, those described below. It is very convenient for these reasons. In other words, this surface heating element is
At least one heat generating printed wiring circuit serving as a heating wire part and a lead wire part is provided on an insulating sheet, and the lead wire part of the heat generating printed wiring circuit is located at one end along the printing direction on one side of the insulating sheet. vertical lines x ₁ , x ₂ , x ₃ reaching from the insulating sheet to the other end, and the heating line section crossing the other two vertical lines x ₂ , x ₃ from the vertical line x ₁ at the end near the other end of the insulating sheet. 1
A horizontal line y ₁ that reaches the end, a horizontal line y ₂ that connects vertical lines x ₂ and x ₃ near the inside of the horizontal line y ₁ , and an innermost vertical line x ₃
and a horizontal line _y3 connecting to the other end of the heating line part, or this unit consists of a plurality of units connected in the printing direction,
The lead wire portion is subjected to necessary punching. Such a surface heating element can be obtained by cutting out the required units from a long body in which a large number of the above units are arranged in the printing direction. An example of this surface heating element will be explained using FIGS. 1 and 2. FIG. 1 shows a surface heating element precursor before punching, and FIG. 2 shows a surface heating element obtained by punching this precursor. As shown in Fig. 1, this planar heating element precursor consists of two units each having one pattern of heating printed wiring circuits on an insulating sheet 1, that is, units A ₁ and A ₂ connected in the printing direction X. It's something that will last. The wiring circuits of the units A ₁ and A ₂ are of the same shape and each includes a heating wire section 2' and a lead wire section 3', and the lead wire section 3' is connected to vertical lines x ₁ , x ₂ , x _{3 .}
and horizontal lines y ₁ , y ₂ , y ₃ . Here, the heating wire portion 2' is shown with the intermediate portion thereof omitted.
The vertical _lines x ₁ , x _{2 ,} x ₃ of each unit A ₁ , A 2 extend along the printing direction
crosses the other two vertical lines x ₂ and x ₃ from the end vertical line x ₁ near the front end of the unit, and
The end has been reached. The horizontal line _y2 connects the vertical lines _x2 and _x3 near the inside of the horizontal line _y1 , and the horizontal line _y3 connects the innermost vertical line _x3 and the heating line portion 2' near the rear end of the unit. On the other hand, the heating line portion 2' has a meandering shape extending perpendicular to the printing direction X as usual.
Vertical lines x ₁ and x ₁ of each unit A ₁ and A ₂ , vertical lines x ₂ and x ₂ ,
Vertical lines x ₃ and x ₃ and heating line parts 2' and 2' are the boundaries of units A ₁ and A ₂ , respectively (indicated by dashed-dotted lines in the figure)
are connected with.

Punching is performed on such a surface heating element precursor. That is, holes are made in the shaded areas in the figure to cut short circuit parts or separate unnecessary parts of the circuit. In this way, a surface heating element 7 as shown in FIG. 2 can be obtained. This surface heating element 7 includes one heat generating printed wiring circuit, which serves as a heat generating wire section 2 and a lead wire section 3, on an insulating sheet 1. Lead wire part 3-2
Among the lead wires 31 and 32 of the book, the lead wire 31 is along the printing direction X at the rear end of the insulating sheet 1 (on the right side of the figure)
It reaches near the front end and is connected to one end of the heating wire section 2. The other lead wire 32 runs between the lead wire 31 and the heat generating wire part 2 along the printing direction It forms a U-shape and is connected to the other end of the heating wire section 2.

FIG. 3 represents another example of a precursor for making a surface heating element. This surface heating element precursor is equipped with two heat generating printed wiring circuits, that is, a first heating printed wiring circuit 4 and a second heating printed wiring circuit 5 running inside the first heating printed wiring circuit 4, and has such a two-circuit configuration. It consists of three units B ₁ , B ₂ , and B ₃ each having a heat generating printed wiring circuit connected in the printing direction. In the figure, the range indicated by A is the one unit range. Each unit B ₁ , B ₂ , B ₃ has the same shape, and each unit is a unit of the surface heating element.
Connect the same lead wire part and heating wire part as A ₁ and A ₂ to 2.
Each set has a pair (however, the horizontal line of the lead wire section of one of the two circuits also crosses the vertical line of the lead wire section of the other circuit). In the figure, 6 is a control printed wiring circuit used for temperature control, etc., but this is not necessarily required. When making a surface heating element from now on, it is preferable to perform punching so as to release the short circuit between the two heating wiring circuits 4 and 5 and the control wiring circuit 6. Similarly, the number of heat generating printed wiring circuits can be further increased, the number of units included in the surface heating element can be increased, and the size of the surface heating element can be changed.

Using such a surface heating element, a sheet heating element is made as follows.As is clear from what has already been said, most of the lead wires of this surface heating element are along the printing direction. Therefore, the line spacing of the lead wire portion can be narrowed. Therefore, when a planar heating element is made using this planar heating element, the temperature rise of the planar heating element becomes almost uniform over the entire surface.

The planar heating element according to the first invention is configured as follows. As shown in FIG. 4, two surface heating elements 7a and 7b of the same structure are arranged in parallel with the printing directions parallel to each other, with their respective lead wires located on the outside, and with the U-shapes facing oppositely. . Next, dotted chain line 8 in the figure for the right surface heating element 7b.
Make a slit as shown. That is, a slit is inserted inside the U-shaped lead wire 32b, extending from the U-shaped opening to near the bottom. This slit creates a separation section 9, so
The tip thereof is connected to the opening of the U-shaped lead wire 32a in the left surface heating element 7a as shown in FIG.
Point towards P ₁ . Then, the left surface heating element 7a
terminal parts 33a, 34a, and the right surface heating element 7b.
The terminal portions 33b and 34b of the terminals 33b and 34b are gathered in this opening _P1 .

In this example, two surface heating elements are used, but two or more may be used. In this case, only the surface heating element at the end is
The heating elements on each side are arranged in parallel so that the letters face in opposite directions and all others face in the same direction. Then, by making the same slits as for the right surface heating element 7b in FIG. 4 in all the remaining pieces except for one end (corresponding to the left surface heating element 7a in FIG. 4). By making a cut-off portion 9 and directing the cut-off portion 9 toward the opening of the U-shaped lead wire in the end surface heating element in the same manner as in the case of FIG. They should be gathered in a club.

Next, the planar heating element according to the second invention is configured as follows. That is, first, Fig. 6a
As shown in , compared to the normal surface heating element 7,
By making a cutting line passing through the inside of the U-shaped lead wire and reaching from one end thereof to the other end, the end portion 10 thereof is cut off, and the remaining portion 11 is attached to the surface to be located at the end in the second invention. Prepared as a heat generating element 7c. At the same time, as shown in FIG. 6b, a slit 9 is made in the ordinary surface heating element 7 in the same manner as in the case of the right surface heating element 7b in FIG. This is surface heating element 7
b. Next, as shown in FIG. 7, the double-sided heat generating elements 7c and 7b are arranged in parallel with the printing directions parallel to each other and their heat generating lines close to each other, and the right side heat generating element 7b is Separation part 9
is the cut point at the bottom of the U-shape in the lead wire section of the left (end) surface heating element 7c.
Turn to P ₂ . Then, at this cutting point _P2 ,
Terminal portions 33c and 34c of the left surface heating element 7c,
The terminal portions 33b and 34b of the right surface heating element 7b are gathered together. Incidentally, if the cut-off portion 9 is too long, the length may be adjusted by cutting it to an appropriate length.

When using three or more surface heating elements, use a surface heating element 7 whose end is cut off only at the end.
Arrange c. Then, the surface heating elements 7b each having a cutaway part 9 on the heating wire side of the surface heating element are arranged in order so that the U-shape of the lead wire part faces the same direction, and each Gather the tip of the cut-off part at one corner of the surface heating element whose end has been cut off.

The planar heating element according to the second invention can also be obtained as follows. As shown in FIG. 8, the surface heating element 7b is turned over so that its heating line is adjacent to the heating line of the surface heating element 7c, and the printing directions of both 7c and 7b are parallel to each other. Arrange them horizontally. Next, as shown in the figure, cut out the cutout portion 9 of the surface heating element 7b at the cut point that was the bottom of the U-shape in the lead wire portion of the surface heating element 7c.
It should point towards P ₂ .

In all of the planar heating elements explained above, the terminals are concentrated in one place, so the cord only needs to exit in one place, and it is located at the corner of the planar heating element. It's getting old.
These sheet heating elements have narrow lead wire intervals and are located on the sides of the sheet heating element.
A decrease in watt density due to the lead wire portion can be avoided. Therefore, the temperature of the entire planar heating element becomes almost uniform, especially the temperature of the central part. Furthermore, in the sheet heating element according to the second invention, the lead wire part of one sheet heating element is cut off midway, so the lead wire part whose temperature does not rise too much can be short, and If it is necessary to insulate the heat generating element, the insulation treatment area will be reduced by the amount of removal. Furthermore, the cutting has the advantage that even if the cut-off portion of the surface heating element is somewhat short, its tip can reach the corner of the end surface heating element with a margin.

In addition, in the planar heating element according to the second invention, even if the following planar heating element is used instead of using the planar heating element 7c, a planar heating element having the same function and effect can be obtained. Can be done. That is, a surface heating element 7d shown in FIG. 9 is used. In the figure, 2 is the heating wire part, 3
is a lead wire portion consisting of two wires 31d and 32d. This surface heating element can be made as follows. In the surface heating element precursor shown in FIG. ₁ , a cutting line running from the front end to the rear _end of the precursor is cut between vertical line A surface heating element precursor as shown in the figure is made, and then punching is performed in the shaded area as shown in the figure. When the thus obtained surface heating element 7d is turned over, the terminal portion will be in the same position as the surface heating element 7c in FIG. Therefore, even if this planar heating element 7d is used instead of the planar heating element 7c, a planar heating element similar to the planar heating element according to the second invention can be obtained.

As shown in FIG. 11, it is convenient to attach terminal portions in advance to three locations on the surface heating element precursor shown in FIG. 1.
That is, the terminal portion 33e is located near the rear end of the vertical lines x ₁ and x ₂ .
34e is installed near the front end of ₃ vertical lines and 1 of the heating line part.
Terminal portions 33f and 34f are provided at both ends, and terminals 33g and 34g are provided near the rear end of the vertical line _x3 and at the other end of the heating wire portion. If a surface heating element is made using such a surface heating element precursor, there is no need to bother with retrofitting terminals at necessary locations one by one. In addition, surface heating elements 7a, 7b, 7c
Alternatively, it may be possible to attach terminals in advance only to the locations where they are needed when 7d is used, but if you try to do that, you will need to prepare the types of precursors that correspond to the number of terminals, but as shown in Figure 11. According to some sources, only one type of precursor is required.

In addition, although in the explanation so far it has been as if the printed wiring circuit is not covered with anything, it goes without saying that in reality it is protected by an insulating coating or the like.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a surface heating element precursor, FIG. 2 is a plan view showing one example of a surface heating element, FIG. 3 is a plan view showing another example of a surface heating element precursor, and FIG. 4 is a plan view showing another example of a surface heating element precursor.
5 and 5 are explanatory diagrams of how to make a planar heating element according to the first invention, FIGS. 6 to 8 are explanatory diagrams of how to make a planar heating element according to the second invention,
FIG. 9 is a plan view of a planar heating element that can be used to make the same configuration as the planar heating element according to the second invention, and FIG. FIG. 11 is a plan view of a precursor of a surface heating element having three terminal portions. 1...Insulating sheet, 2, 2'...Heating wire part, 3,
3'... Lead wire portion, 4... First printed wiring circuit for heat generation, 5... Second printed wiring circuit for heat generation,
7, 7a, 7b, 7c, 7d... surface heating element, 9...
Separated portion of the surface heating element, 10... End portion of the surface heating element, 11... Remaining portion of the surface heating element, 31, 32, 3
1a, 32a, 31b, 32b, 31d, 32d
...Lead wires, 33a, 34a, 33b, 34b,
33c, 34c, 33d, 34d, 33e, 34
e, 33f, 34f, 33g, 34g...terminal part,
x ₁ - x ₃ ... Vertical line of the lead wire section, y ₁ - _{y 3} ... Horizontal line of the lead wire section.

Claims (1)

[Scope of Claims] 1. At least one heat-generating printed wiring circuit serving as a heat-generating wire portion and a lead wire portion is provided on an insulating sheet, and the heat-generating printed wiring circuit has one of its lead wire portions connected to the insulating sheet. On one side of the sheet, along the printing direction, one end of the insulating sheet reaches near the other end and is connected to one end of the heating wire section, and another one of the lead wire sections is connected to the one lead wire. and the heat-generating wire portion, the U
A plurality of surface heating elements are used that form a character shape and are connected to the other end of the heating wire section, and these surface heating elements are arranged horizontally with the printing direction parallel to each other, with only one sheet remaining at the end. A cut-off portion is formed on the inside of the U-shaped lead wire by a slit formed from the opening toward the bottom of the U-shaped lead wire, and the cut-off portion is connected to the opening of the U-shaped lead wire in the surface heating element at the end. A planar heating element characterized in that the terminal portions of each planar heating element are gathered in the opening by directing the heating element toward the opening. 2. The surface heating element is provided with at least one heat generating printed wiring circuit serving as a heating wire portion and a lead wire portion on an insulating sheet, and the heat generating printed wiring circuit has a lead wire portion on one side of the insulating sheet. A vertical line that runs from one end to the other along the printing direction
x ₁ , x ₂ , x ₃ , and a horizontal line y that crosses the other two vertical lines x ₂ , x ₃ from the end vertical line x ₁ near the other end of the insulating sheet and reaches one end of the heating line section. ₁ and the horizontal line
Horizontal line y ₂ connecting vertical lines x ₂ and x ₃ near the inside of y ₁
and a horizontal line y ₃ connecting the innermost vertical line x ₃ to the other end of the heating line part, or a plurality of units connected in the printing direction, and the above-mentioned The planar heating element according to claim 1, wherein the lead wire portion is subjected to necessary punching processing. 3. At least one heat-generating printed wiring circuit serving as a heat-generating wire portion and a lead wire portion is provided on an insulating sheet, and one of the lead wire portions of the heat-generating printed wiring circuit is printed on one side of the insulating sheet. along the direction from one end of the insulating sheet to near the other end and connected to one end of the heating wire section, and another one of the lead wire sections is between the one lead wire and the heating wire section. , by reaching from one end of the insulating sheet to near the other end along the printing direction, and then folding back and returning to near the one end of the insulating sheet.
A plurality of surface heating elements are used that form a letter shape and are connected to the other end of the heating wire section, and these surface heating elements are arranged horizontally with the printing direction parallel to each other, and one of the end sheets is connected to the U-shaped lead. The ends are cut off by a cutting line that passes through the inside of the wire and reaches from one end of the surface heating element to the other end, and all that remains is formed inside the U-shaped lead wire from the opening toward the bottom. A cut-off part is created by the slit, and by directing this cut-off part to the cut point that was the bottom of the U shape in the lead wire part of the surface heating element at the end, the terminal part of each surface heating element is cut out. are gathered at the cut point. 4. The surface heating element includes at least one heat generating printed wiring circuit serving as a heating wire part and a lead wire part on an insulating sheet, and the lead wire part of the heat generating printed wiring circuit is disposed on one side of the insulating sheet. A vertical line that runs from one end to the other along the printing direction
x ₁ , x ₂ , x ₃ , and a horizontal line y that crosses the other two vertical lines x ₂ , x ₃ from the end vertical line x ₁ near the other end of the insulating sheet and reaches one end of the heating line section. ₁ and the horizontal line
Horizontal line y ₂ connecting vertical lines x ₂ and x ₃ near the inside of y ₁
and a horizontal line y ₃ connecting the innermost vertical line x ₃ to the other end of the heating line part, or a plurality of units connected in the printing direction, and the above-mentioned The planar heating element according to claim 3, wherein the lead wire portion is subjected to necessary punching processing.