Sheet heating element
A heating element, sheet-like technology, applied in electrical elements, electric heating devices, ohmic resistance heating, etc., can solve the problems of high cost and low manufacturing yield
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Embodiment 1
[0084] An example of a chip heating element using the above polymer resistor will be described below. Figure 4A It is a plan view of Embodiment 1 of the sheet heating element of the present invention, Figure 4B is taken along line 4B-4B Figure 4A A cross-sectional view of a sheet-like heating element.
[0085] The sheet-shaped heating element 40 includes an insulating base 41 , a first wire electrode 42A, a second wire electrode 42B, and a polymer resistor 44 . The wire electrodes 42A, 42B are sometimes collectively referred to as the wire electrodes 42 . The wire electrode 42 is sewn onto the insulating base 41 with a wire 43 . A polymer resistor 44 is thermally adhered on top of the structure in the form of a film.
[0086]The sheet-like heating element 40 was fabricated in the following manner. First, the line electrodes 42A, 42B are symmetrically provided on the insulating base 41 . Next, the wire electrodes 42A, 42B are partially sewn onto the insulating base 41 ...
Embodiment 2
[0142] Figure 7A It is a plan view of the sheet heating element 70 of Embodiment 2 of the present invention, Figure 7B is along Figure 7A A cross-sectional view taken along line 7B-7B in . This structure and the structure of embodiment 1 (referring to Figure 4A ) is that the wire electrode 71 is provided on the insulating substrate 41 as a corrugated line.
[0143] Such as Figure 7A As shown in , the wire electrode 71 is disposed on the insulating substrate 41 as a wave wire, and is attached through the wire 43 . According to this structure, when an external force is applied to the sheet-like heating element 70, since the wire electrodes 71 are arranged in wave-shaped lines with allowable leeway in length, they easily respond to tension, stretching, and bending. change shape. Therefore, the corrugated wire electrode 71 has advantages over such as Figure 4A The mechanical strength of the wire electrodes 42 arranged in a straight line with respect to an external for...
Embodiment 3
[0148] Figure 8A It is a plan view of the sheet heating element of Embodiment 3 of the present invention, Figure 8B is along Figure 8A A cross-sectional view taken along line 8B-8B in . This structure and the structure of embodiment 1 (referring to Figure 4A ) is that the auxiliary wire electrode 81 is provided between the wire electrode pair 42. In other words, the auxiliary wire electrode 81 is provided between the pair of wire electrodes 42 and, as in the case of the wire electrode 42, is sewn onto the insulating base 41 by a sewing machine using a wire 82 made of polyester fiber or the like.
[0149] exist Figure 4A In the structure shown in , the polymer resistor 44 tends to heat unevenly between the wire electrodes 42, and the resistivity of that portion increases so that the potential is concentrated there. If this state continues, the temperature of that part of the polymer resistor 44 rises more than other parts, causing a well-known hot-line phenomenon. th...
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