JPH0241157B2 - MENJOHIITA - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a planar heater used as a heating source using electrical energy in equipment such as space heaters, cookers, and dryers, and in particular, the present invention relates to a planar heater that is used as a heating source using electrical energy in equipment such as space heaters, cookers, and dryers. This relates to a planar heater that is closely fixed. BACKGROUND OF THE INVENTION In recent years, planar heaters have come into the spotlight as heating elements that meet the demands for thinning devices and uniform heating, and the following various planar heaters have been on the market. (1) A structure in which a heater is wound around an insulating substrate such as mica. (2) A structure in which a conductive pattern is formed on an alumina substrate using a conductive paste such as tungsten, and then an alumina substrate is placed on top of the conductive pattern and integrally molded. (3) Those with a laminated structure in which a conductive pattern is formed between organic films (silicone, polyimide, etc.) However, in the case of (1) in these sheet heaters, the heated object There were problems with moisture resistance due to poor heat transfer to and because the heater was not sealed.
In the case of (2), the strength of the electrical outlet is weak,
Due to its large heat capacity, there was a problem of a long rise time. Furthermore, in the case of (3), the heat resistance temperature was low and there were problems with the life characteristics. Therefore, in order to solve the above problem,
As shown in Japanese Patent No. 171296, a planar heater using a hollow substrate has been proposed. Furthermore, the present inventors have further improved the planar heater using the hollow substrate described above, and have proposed a new planar heater using a heater element made of a smooth mesh metal foil. In the planar heater proposed by the present inventors, as shown in FIG. 3, a heater coating layer 2 made of hollow material is provided on a hollow substrate 1 in which an insulating hollow layer 1a is formed on a metal substrate 1b. In the layer 2, there is a heater element 3 made of a smooth mesh metal foil body, and an electrical outlet terminal plate 4 connected to the heater element 3 and made of a metal foil body.
It has a structure in which a part of it is buried. Problems to be Solved by the Invention However, the metal foil shown in FIG. 5 is used as the electrical outlet terminal plate 4 connected to the heater element 3 made of the smooth mesh metal foil shown in FIG. Furthermore, in the conventional planar heater that uses hollow material as the material for the heater coating layer 2, in the heat treatment step performed for the purpose of tightly fixing the heater element 3 on the hollow substrate 1 by the heater coating layer 2, As shown in FIG. 6, large air bubbles 5 are generated in the heater coating layer 2 or the insulating hollow layer 1a located below the electrical extraction terminal plate 4. As a result, the heater element 3 and the hollow substrate 1
This will significantly reduce the withstand voltage characteristics between the metal substrate 1b inside the terminal and the adhesion strength between the electrical outlet terminal plate 4 and the heater coating layer 2. As described above, in the conventional configuration, an unfavorable phenomenon occurs and there are problems in reality. The present invention solves the above-mentioned problems, and
The object of the present invention is to provide a planar heater with excellent voltage resistance characteristics and adhesion strength of an electrical outlet terminal plate. Means for Solving the Problems In order to solve the above problems, the present invention provides an electrical outlet terminal board made of a metal foil body, in particular,
A hole is provided in the part buried in the heater coating layer. Function Generally, hollow substrates have very fine air bubbles in the insulating hollow layer, but in the heat treatment process in which the heater element and the electrical outlet terminal board are tightly fixed on the hollow substrate with the heater coating layer, The bubbles exit into the atmosphere through the heater coating layer. However, the air bubbles in the insulating hollow layer located under the electrical outlet terminal board are obstructed by the electrical outlet terminal board, and cannot escape into the atmosphere. Large air bubbles remain in the coating layer or the insulating hollow layer. As a result,
This causes the above-mentioned deterioration of the withstand voltage characteristics and the deterioration of the adhesion strength of the electrical outlet terminal board. However, in the present invention, since the hole is provided in the part of the electrical outlet terminal board that is embedded in the heater coating layer, small air bubbles in the insulating hollow layer can easily escape through the hole, so that No large bubbles remain, and as a result, it exhibits excellent withstand voltage characteristics and adhesion strength of the electrical outlet terminal board. Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. As shown in Table 1, the metal substrate 11a made of a steel plate for hollow holes is made of a highly insulating material that does not contain substances that cause ion conduction such as Na ₂ O, K ₂ O, Li ₂ O, P ₂ O ₅ and has KF added. Insulating hollow layer 1 made of glass frit
A hollow substrate 11 on which 1b was formed was prepared.

[Table] In addition, as shown in Fig. 2, the heater element 12 made of smooth mesh SUS430 has a diameter of 2 mm.
A heater element 12 was prepared by connecting an electrical outlet terminal plate 13 made of SUS430 with six mm-sized holes 13a by spot welding. Next, a slip made of hollow material is thinly applied on the hollow substrate 11 prepared by the above method,
Then, the heater element 12 to which the electrical outlet terminal plate 13 was connected was placed in an undried state, and a slip made of a similar hollow material was applied thereon. After drying, this is heat-treated and the heater element 1 is placed in the heater coating layer 14 made of hollow material.
2, the heater element 12 is closely fixed on the hollow substrate 11, and the first
Ten planar heaters of the present invention having the structure shown in the figure were completed, and the sample numbers were numbered 11 to 20. For comparison, 10 conventional planar heaters were constructed using the electrical outlet terminal plate 4 without holes as shown in FIG. And so. The withstand voltage characteristics and the adhesion strength of the electrical outlet terminal plates 4 and 13 of each of the completed planar heaters were measured. The withstand voltage characteristics are determined by the electrical output terminal plates 4 and 13 and the metal substrates 1b and 11a in the hollow substrates 1 and 11.
This was done by measuring between. On the other hand, the adhesion strength of the electrical outlet terminal plates 4 and 13 can be determined by fixing the parts exposed from the heater coating layers 2 and 14 to a scale and pulling the scale in a direction perpendicular to the hollow substrates 1 and 11. With a load of Kg, the electrical outlet terminal plate 4,
13 was measured to see if it peeled off. The results measured by the above method are shown in Table 2.

【table】

[Table] As is clear from Table 2 above, the planar heaters of sample numbers 1 to 10 using the conventional electrical outlet terminal plate 4 have low withstand voltage characteristics of 200 V to 1100 V, and the electrical outlet terminal plate 4 The adhesion strength is also 0.5Kg~1.6
It showed a low value of Kg. However, the planar heaters of the present invention of sample numbers 11 to 20 using the electrical outlet terminal plate 13 having the hole 13a have high withstand voltage characteristics of 2000 V or more and 5.0 kg
The above-mentioned high adhesion strengths were exhibited, and the properties were significantly superior to those of conventional planar heaters. As described above, by using the electrical outlet terminal plate 13 having the holes 13a, the effect of increasing the withstand voltage characteristics and the adhesion strength of the electrical outlet terminal plate 13 was obtained. In the embodiment of the present invention, the diameter of the hole 13a provided in the electrical outlet terminal plate 13 is 2 mm.
Although the number was six, it is not particularly limited to this, and any diameter, number, or shape that allows the bubbles to escape to the outside may be used. Further, in the embodiment of the present invention, the holes 13a are provided only in the portions to be buried in the heater coating layer 12, but this is not particularly limited, and they may be provided in the portions that are not buried in the heater coating layer 12. good. Effects of the Invention As is clear from the above description, according to the present invention, a heater coating layer is provided on a hollow substrate, and a heater element made of a smooth mesh metal foil is provided in the heater coating layer. In addition to being connected to this heater element, at least the part buried in the heater coating layer has a hole and an electrical outlet terminal board made of metal foil is embedded, so that the electrical outlet terminal board has excellent withstand voltage characteristics. It is possible to provide a planar heater with excellent adhesion strength.

[Brief explanation of drawings]

Fig. 1 is an enlarged longitudinal cross-sectional view of a main part of a planar heater showing an embodiment of the present invention, Fig. 2 is a perspective view of an electrical outlet terminal plate in the planar heater, and Fig. 3 is a diagram of a conventional planar heater. An enlarged vertical sectional view of the main part, FIG. 4 is a front view of a heater element in a conventional sheet heater,
FIG. 5 is a perspective view of a conventional electrical outlet terminal plate, and FIG. 6 is an enlarged vertical cross-sectional view of a main part showing how bubbles are generated in a conventional sheet heater. 11... Hollow board, 12... Heater element, 13... Electrical extraction terminal board, 13a...
Hole, 14... Heater coating layer.

Claims (1)

[Claims] 1. A heater coating layer is provided on the hollow substrate, and a heater element made of a smooth mesh metal foil is provided in the heater coating layer, and a heater element is connected to the heater element and is embedded in at least the heater coating layer. What is claimed is: 1. A planar heater having a hole in a portion thereof, and having an electrical outlet terminal plate made of metal foil embedded therein.