JPS6329480A - Panel heater - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a planar heating element used in electric carpets and the like.

(Background Art) When an electric carpet or the like is configured with a planar heating element, in normal use, when a cushion or the like is used on the electric carpet, it may become locally insulated and become partially overheated.

In order to avoid such overheating, for example, the patent application
In No. 198, the impedance between the heating wire and the temperature detection wire t is increased, as shown in the plan view in Figure 5 @) and the A-A sectional view in Figure 5 (B) and Figure 5 (A). , there is one in which a first dummy electrode d1 is provided in order to significantly reduce heat generation due to sensor current and prevent warm rise under the heat insulating material during local insulation. In the figure, f is a heat-sensitive film, and d2a''2b is a second dummy electrode.

However, when wiring the sheet heating element shown in Figure 5 (a), in order to avoid printing defects during the manufacturing stage of the sheet heating element, The distance W1 between the wires in the feeding direction of the planar heating element, that is, in the direction parallel to the direction of the arrow
The distance between wirings 8aW2 is required to be about 4 to 5 rm. Therefore, compared to the pitch between the heating wires, that is, the pitch P1 when the heating wires run parallel to the feeding direction,
When the heating line intersects at a certain angle with respect to the feeding direction, the pitch P2 becomes wider. The fibers were rougher than the wires, and the temperature in that area did not rise, causing uneven temperature distribution in the electric carpet.

(Object of the Invention) The present invention has been proposed in view of the above points, and its purpose is to provide a planar heating element in which the pitch between heating edges is narrowed to reduce unevenness in temperature distribution. be.

(Disclosure of invention) An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1(a) and 1(b) are diagrams showing an embodiment of the present invention, and FIG. 1(a) is a plan view showing the turn wiring;
The figure (b) is a sectional view taken along the line BB in the figure (a). The circuit arrangement shown in this figure has two circuits, circuit 1 and circuit 2, running in parallel. In these two circuits, the top part a of Shiratae 1 circuit 1 (the first dummy electrode d1 is removed at the positions d and a, and the outer shape is shown) and the shoulder part b of circuit 2 (the top part both sides) first dummy electrode d
1 was removed at the position d + b, and a heating line was placed at the removed part, and the pitch P between the heating lines Fyl and h at the shoulder was reduced from the pitch P2 shown in Figure 5. . In this case, the difference between P3 and P2 is the distance between the wires W2 and the first
It is the sum of the dummy electric current %d, and the line l@dW. That is,
The pitch between the heating lines decreases by W2+dW, the amount of heat generated per unit surface increases, the temperature at that part increases, and the unevenness of the temperature distribution can be improved. In addition, at the top part a, the heat generation line 1. i? ' can be increased, and the unevenness of temperature distribution can also be improved in this region.

Note that the reason why the first gummy poles on the upper part of the outer shape circuit 2 and the shoulder of the inner support 9 route 1 are not removed will be explained with reference to FIGS. 2 and 3. On the other hand, as shown in FIG. 3, if local heat insulation is performed on the planar heating element by the elongated heat insulator 3, the top part cV of the circuits 1 and 2
If the pole d1 is not provided on the first gummy C, it will not be possible to detect the temperature of the part that is covered by the insulation 3 over the entire top part C, so there is a risk that the lower part of the insulation 3 will become abnormally hot. On the other hand, in the case of the present invention shown in Fig. 3, even if the heat insulating material 3 similar to Fig. 2 performs one-south heat insulation on the planar heating element, the 7-crystal py The area where detection cannot be performed is the area indicated by d above D'1, where the insulation material 3
The temperature below the room does not become abnormally unstable.

Next, FIG. 4 is a plan view showing an example of the Sennoji Mlj of the present invention. In this embodiment, the difference between the impedance signal to be detected at the top a of the four-way circuit 1, the heating wire of the entire circuit 2, the overlap between the second dummy electrode d2IL, and the first dummy electric current d1. Wrap the second dummy electrode d2ah and d2b, and J2) Furthermore, wrap the second dummy electrode d2b and the temperature sensor dt in the same manner as shown in FIG. 1(a). H4, I, , Jl and the like are made thicker and their opposing areas are made wider so that a sufficient impedance signal can be obtained. Furthermore, the facing area of the shoulder portion of the circuit 2 is similarly made larger than that of the circuit 1. With these corrections, it is possible to ensure the same temperature detection ability as in the past, and also to improve the unevenness of temperature distribution.

(Effects of the Invention) As described above, according to the present invention, temperature distribution unevenness is reduced by removing the first dummy electrode and disposing at least one of the heat generation line and the temperature detection line. In addition, since the area occupied by the first dummy electrode among the heating wires, first dummy electrodes, and temperature/sensing wires on the same surface is reduced, it is possible to arrange more heating wires and temperature sensing wires, so it is possible to design a turn design. The degree of freedom increases. Since there is a degree of freedom in pattern design in this way, heat generation can increase the width of the temperature detection line, thereby increasing the lifespan until disconnection. That is,
Wire breakage occurs when a crack occurs in the wire width direction and the crack crosses the wire width direction.1. 5% throughout the area, the occurrence of cracks can be minimized and a long life can be achieved. In addition, since the wire width can be made wider, the wire length is the same as when the wire width was narrow; if you are trying to produce a uniform amount of heat, the wire width is narrower when the wire width is wider. This has the effect of reducing costs because it is possible to use gold foil, which is thinner than the regular gold foil.

[Brief explanation of the drawing]

Figures 1 (a) and 1 (b) are diagrams showing examples of the present invention; the figure @) is a plan view, and the figure (b) is the figure 8-8 of the figure (a).
8 sectional views, FIGS. 2 and 3 are diagrams explaining the usage state of the present invention, 4th sectional view 1 is a diagram showing another embodiment of the present invention, and FIGS. Figure (a) is a plan view, and figure (b) is a diagram showing the planar heating element of figure (a).
It is an A sectional view. 1.2...Circuit, h...Heating wire, t...Temperature detection operation, dl...First dummy electrode, d, a, d, 5/7
・First dummy electrode end "2a" 2b...Second dummy electrode, a...Top part, b...Shoulder part, P, , P, P
3...Pitch, Hl, H. I,,I2. J,,J2. 1. 2. Rap. Applicant: Matsushita Kameko Co., Ltd. Patent attorney Toshio Takayama 2). (1 other person) Pa' Figure 2 Figure 31! A

Claims (2)

[Claims] (1) A heating line and a temperature sensing line are wired in parallel on one side of the thermosensitive film, a first dummy electrode is arranged between them, and a heating line and a temperature sensing line are wired on the other side of the thermosensitive film, facing the heating line and the temperature sensing line. , and in a planar heating element in which a second dummy electrode is disposed at a position opposite to the first dummy electrode, the heating line and the temperature detection line are arranged in a zigzag pattern and are arranged in multiple rows in parallel. A planar heating element characterized in that the first dummy electrode other than the outermost circuit at the top is removed, and at least one of a heating wire and a temperature sensing wire is disposed in that position. (2) The planar heating element according to claim 1, characterized in that the opposing area between each dummy electrode at the top of the outermost circuit and the heating wire and the temperature detection wire is made larger than other parts. A sheet heating element.