JPS6057194B2 - Planar heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a planar heating device such as an electric carpet, and particularly to the correlation between the electrode arrangement pattern of a planar temperature sensor and the arrangement pattern of a heating element.

Conventionally, planar heat-sensitive materials have been used in electric carpets and other products to reduce their thickness, but if there are small scratches or bends on the electrodes of the planar heat-sensitive material, which are usually overlooked, the surface condition may deteriorate. When configured or used as a heat sensitive body, electric carpet, etc., the damage may spread due to external force and the electrode may break, or cracks may form at the bend and spread, causing the electrode to break. The temperature cannot be detected in all parts, which may lead to unexpected overheating accidents.

FIG. 1 is a configuration diagram of a conventionally used planar heat-sensitive member and planar heating element integrated, where 1 is an electrode on one side of the planar heat-sensitive member, 2 is a terminal portion of electrode 1, and 3 is a A sheet temperature-sensitive material, 4 is the other electrode of the sheet temperature-sensitive body facing the electrode 1 through the sheet temperature-sensitive material, 5 is a terminal portion of the electrode 4, and 6 is a material such as polyester, polyvinyl chloride, polyethylene, etc. 7 is a meandering sheet heating element; 8 is a terminal portion on one side of the sheet heating element 7; and 9 is a terminal portion on the other side of the sheet heating element 7.

If an electrode like the one shown in Figure 1 is used here, if there is a small scratch or bend on the electrode itself, the scratch will spread due to external force when configuring or using it as a heat sensitive body, electric carpet, etc. Or electrode breakage occurs due to cracks caused by repeated bending. In addition, when constructed as an electric carpet, the heat-sensitive element and the heating element are generally sealed with a plastic sheet or the like, and the plastic sheet or the like provides insulation between the electrodes and the outside and moisture-proofing properties. In such cases, the electrodes are corroded due to moisture remaining inside the sheet due to temperature rise or additives mixed in the sheet, and as shown in FIGS. 2 and 3, parts of the electrodes 10, 10' is cut off, making it impossible to detect abnormal temperature rises in that area. The present invention solves these conventional drawbacks, and embodiments thereof will be described below with reference to the drawings.

In FIG. 4, 11 is a meandering electrode on one side of the planar sensing element, 12 and 13 are terminals of the electrode 11, 14 is a planar temperature-sensitive material, and 15 is an electrode connected through the planar temperature-sensitive material 14. 11 is the other electrode of the planar heat sensitive body facing the electrode, 16 and 17 are terminal portions of the electrode 15, and 18 is an insulating sheet between the electrode 15 and the heating element 19;
9 is a meandering heating element, 20 and 21 are terminal parts of the heating element 19, and terminal parts 12, 13, 16, and 17 are connected to the temperature control circuit so that the signal current of the temperature control circuit flows through the electrodes 11 and 15. It is connected. Even if the scratches on the electrodes like those mentioned above spread, the electrodes remain at normal temperatures until they are cut because the width of the electrodes is small and the structure is such that signals pass from one side of the electrode to the other. After the detection is performed, when the electrode is finally disconnected, the signal current for temperature control does not flow, and the power supply to the heating element 19 is stopped.

In addition, in this type of planar heating device, it is common to arrange the planar heat-sensitive member and the heating element overlapping each other, but it is not possible to arrange the electrodes of the heat-sensitive member and the heating element completely overlapping each other. It is difficult and prone to misalignment.

In this case, changes in the impedance, resistance, or capacitance of the heat-sensitive element due to the temperature of the heat-generating element, the so-called sensitivity of the heat-sensitive element, vary greatly from product to product, and the set temperature of the heat-generating element differs from product to product. It is necessary to take measures to reduce the variation in temperature settings for each product. Therefore, in the present invention, as shown in FIG. 5, by arranging the meandering electrode 15 of the heat sensitive body and the meandering heating element 19 so as to intersect with each other, it is possible to significantly reduce the variation in set temperature for each product. I try to do that.

Note that the other meandering electrode 11 is disposed to directly face the meandering electrode 15. In FIG. 5, 15 is a meandering electrode of a heat sensitive body, 19 is a meandering heating element, and P is a heating element 1.
9 is the arrangement pitch, W is the arrangement width (meandering amplitude) of the heating element 23
, θ is the intersection angle between the electrode 15 of the heat sensitive body and the heating element 19. In the present invention, 0 is 900 from Tan-1P/2W.
It is in the range of With this configuration, the sensitivity of the heat sensitive body (variations in the set temperature of the product) can be made uniform, and it is possible to prevent variations in the set temperature of the product due to the sensitivity of the heat sensitive body and the resulting unexpected heating accidents. I can do it.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional planar heat sensitive body, Figures 2 and 3 are
The figure is a perspective view showing the state of broken electrodes of a conventional planar heat-sensitive member, FIG. 4 is a perspective view of a polymer of a planar heat-sensitive member and a heating element used in an embodiment of the present invention, and FIG. FIG. 2 is a layout diagram showing the correlation between the electrodes of the planar heat-sensitive member and the heating element. 11, 15... Electrode, 14... Planar heat-sensitive material, 18... Insulating sheet, 19... Heat generating element.

Claims (1)

[Claims] 1 A planar heat-sensitive member comprising a planar heat-sensitive member configured by arranging meandering electrodes on both sides of the planar heat-sensitive material, and a meander-like heating element arranged on one side of the planar heat-sensitive member. The intersection angle θ between the meandering electrode and the meandering heating element, the meandering pitch width P of the heating element
, if the heating element has a meandering amplitude W, then θ is tan^-^1P
/2W≦θ≦90°.