JPH04556Y2 - - Google Patents

Description

[Detailed description of the invention] (Technical field) The invention relates to a heat-sensitive sheet heating element. Specifically, a metal foil such as aluminum foil is bonded to an insulating film, and a circuit pattern is printed on the surface of the metal foil using resist ink. Then, an etching process is performed to form a predetermined circuit pattern, and a heat-generating resin film as an organic semiconductor made of nylon resin or the like is provided in contact with the circuit pattern, and an insulating film is further attached. The present invention relates to a heat-sensitive sheet heating element that detects a change in impedance of an organic semiconductor between a heat-generating line and a heat-sensitive line due to a change in temperature and controls energization of the heat-generating line.

(Background Art) Conventionally, this type of sheet heating element has been used for wide-area heating devices such as electric carpets, but as mentioned above, the circuit pattern is formed by printing, so there are limitations due to the equipment of the printing machine. In order to prevent the metal foil from sagging or kinking due to the difference in thermal expansion coefficient between the metal foil and the insulating film (usually made of polyester, polyethylene, etc.), the circuit pattern is placed on a long surface. In the case of shaped heating elements, in order to prevent the linear portion from becoming long, the metal foil is formed in multiple blocks with a length that will not cause creases in the metal foil depending on the size of the printing machine and the temperature used. Furthermore, since the gravure printing method is usually selected as the printing method, the long portion of the circuit pattern is selected in the longitudinal direction (printing direction) of the elongated planar heating element for the purpose of improving ink doctoring. Therefore, the gap between the circuit patterns in the longitudinal direction can be narrowed because there is no fear of the doctor cutting, but the gap between the circuit patterns can be narrowed in the part where the circuit pattern is folded back (the part extending in the lateral direction).
Because of the fear of doctor cutting, the gap between the circuit patterns is made wider than in the longitudinal direction to prevent patterns from shorting due to poor doctor cutting during printing. moreover,
The folded portion is not stretched in the lateral direction but is tilted to improve the doctor cut, but it has not been possible to make the gap between the lines the same as in the longitudinal direction.

For this reason, in particular, a heating line and a heat-sensitive line made of metal foil are wired almost in parallel on the same plane.
In a heat-sensitive sheet heating element in which a heat-sensitive resin film with a negative characteristic is provided so as to be in contact with both the heat-generating line and the heat-sensitive line, and insulating films are pasted on both sides, the gap between the lines varies depending on the part.
This has resulted in the following drawbacks. In other words, in electric carpets, etc., simply changing the temperature setting without changing the wattage according to the room temperature will not change the heat generation density, so if the room temperature is high, the temperature when the human body sits on it will be too hot. ” phenomenon occurs, and it is necessary to change the wattage from the perspective of energy conservation.
As mentioned above, if the gap between the lines is partially different, especially when switching to a low wattage, the heat generation density will change greatly near the folded part of the pattern, causing a phenomenon of "lukewarmness" in some parts. There was a problem with the heating feeling being poor.

For example, in this type of conventional example having the patterns shown in FIGS. 4 and 5, a space is provided between the heat generating line 11 and the heat sensitive line 12 to prevent doctoring, as shown in FIG. Due to the fact that there is a part A where the line is wide, if the heating line 11 is used as a heat-sensitive line and the heat-sensitive line 12 is used as a heat-generating line and switched to low wattage as shown in Fig. 5, the low wattage line There was a problem in that the mutual pitch became too wide and, in addition to the low wattage, a "wet" part was created along the lateral gap part B. In addition, Figures 4 and 5
In the figure, 13 indicates a thermosensitive resin film as an organic semiconductor, and 14 indicates an insulating film.

(Purpose of the invention) This invention was proposed in view of the above drawbacks.
The purpose of this is to maintain the heat generation density during low wattage switching in the lateral direction, which is caused by the mutual pattern of the folded portions of the heating lines along the longitudinal direction of the planar heating element, without significantly lowering it compared to other parts. To provide a heat-sensitive sheet heating element which improves the feeling of heating by preventing the phenomenon of "lukewarmness" from occurring partially when switching to a low wattage.

(Disclosure of the invention) The invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the present invention, and in FIG. 1, 1 is a first heat generating line, 2 is a first heat generating line installed in parallel with the first heat generating line 1, and 2 is a first heat generating line. 3 is a thermosensitive resin film as an organic semiconductor; 4 is an insulating film;
is a terminal part, and 6 is a horizontal gap.In the present invention, one of the first and second heat generating lines 1 and 2, which have different line widths and different resistance values, that is, wattage, is a heat generating line, and the other is a heat sensitive line. The number of watts can be switched and used as a line, and a heat generating line with a low wattage (in this embodiment, the second heat generating line 2) is arranged on the outside of the heat-sensitive sheet heating element when viewed from the terminal part 5. It is.

With this configuration, even when switching to the low wattage side and heating by the second heat generation line 2, the gap 6 in the transverse direction caused by the mutual pattern of the folded parts of the first heat generation line 1 can be avoided. It does not feel lukewarm, and the feeling of heating is improved. In addition, long sheet heating elements are usually printed continuously using a printing roll to form one sheet heating element with several patterns, and the cut section usually forms a gap wider than the heating section in the transverse direction. However, according to the present invention, this part is less likely to be "lukewarm" when switching to low wattage.

Although FIG. 2 is a cross-sectional view of the main part of this embodiment, the present invention has an auxiliary tube divided into multiple parts so as to face both the first and second heating lines 1 and 2, as shown in FIG. Of course, it is also applicable to a type provided with a conductive plate 7. Here, in FIG. 3, numeral 8 indicates resist ink.

(Effects of the invention) As described above, according to the invention, the first and second heating lines, which are used selectively as a heating line and a heat-sensitive line, are formed of metal foil, and have different resistance values are organic semiconductors. In a planar heating element formed substantially in parallel on the surface of the heating element, the impedance change of the organic semiconductor between the heat generating lines due to a temperature change is detected to control energization to the heat generating line. Of the first and second heat generating lines, a low wattage heat generating line is formed on the outside when viewed from the terminal portion, and
The heating lines are arranged in a zigzag pattern from the inlet to the outlet of the heating element's terminal section to each other, with a main line running along the length direction and a sub line running perpendicularly (laterally) to the main line on both the outward and return lines. By arranging them in parallel, the first and second heating lines are parallel to each other.
And by being arranged in a zigzag pattern,
This has the effect of uniformly heating all parts of the planar heating element.

[Brief explanation of the drawing]

1 and 2 show one embodiment of the present invention, in which FIG. 1 is a schematic configuration diagram, FIG. 2 is a sectional view of main parts, and FIG. 3 is a schematic diagram showing another embodiment of the present invention. The partial sectional view, FIG. 4, and FIG. 5 are explanatory diagrams of a conventional example. DESCRIPTION OF SYMBOLS 1...First heat generating line, 2...Second heat generating line, 3...Thermosensitive resin film as an organic semiconductor, 5...Terminal portion.

Claims (1)

[Scope of utility model registration request] First and second heat generating lines, which are used selectively as a heat generating line and a heat sensitive line, are made of metal foil, and have different resistance values are formed almost parallel to each other on the surface of the organic semiconductor, and are used as a heat generating line and a heat sensitive line. In the planar heating element, in which the impedance change of the organic semiconductor between the heat generating lines is detected to control energization to the heat generating lines, the lower watt side of the first and second heat generating lines is A heat generating line is formed on the outside when viewed from the terminal part, and the first and second heat generating lines are formed as a main line along the length direction in both the outward and return directions from the inlet to the outlet of the terminal part of the heating element. 1. A heat-sensitive sheet heating element characterized in that the heating element is arranged in a zigzag pattern parallel to each other with sub-lines extending in a direction perpendicular to the heating element.