JPS628487A - Manufacture of surface heat generating body - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method of manufacturing a planar heating element, which is formed by providing one or more pairs of strip-shaped electrodes and forming a heating resistor coating.

2. Description of the Related Art An example of the structure of a conventional planar heating element will be described with reference to the drawings. FIGS. 3 and 4 show the structure of a conventional sheet heating element. In FIG. 4, reference numeral 1 denotes an insulating substrate, on the surface of which a heating resistor coating 2 is applied.

Reference numeral 3 denotes a band-shaped electrode located at the end of the heating resistor coating film 2. These resistance heating elements2. The strip electrode 3 is insulated with an insulating protective film 6. Insulation protection film 6
A hole 6' is drilled in the part corresponding to the end of the strip-like electrode, and a part of the end of the reed-strip electrode is exposed.The lead wire 4 is fixed to that part with soldering or the like, and the fixed part is fixed. When the casting material 7 is cast into the shaping die 6, it is insulated. The structure as described above ensures insulation as a sheet heating element.

Problems to be Solved by the Invention However, in the above configuration, in order to ensure insulation at the joint between the strip electrode 3 and the lead a4, if the casting mold 6 is cast into a strip after bonding the insulation protective film 6, It requires a process. In this case, not only the number of man-hours is large, but also the insulation may be damaged if the casting mold 6 is misaligned. Furthermore, if the adhesiveness of the casting mold 6 to the insulating protective film 6 is poor, the casting material may leak, resulting in problems such as insufficient insulation.

In view of the above-mentioned problems, the present invention simplifies the manufacturing process of the sheet heating element, can easily automate the manufacturing, and provides a sheet heating element having sufficient insulation properties. It is.

Means for Solving the Problems In order to solve the above-mentioned problems, the planar heating element of the present invention is provided by forming a recess around the joint between the strip electrode 3 and the lead wire 4 using a press or the like, and then molding the recess into the recess. It is constructed by pouring and molding material to ensure sufficient insulation.

Function: With the above-described configuration, the present invention does not use a casting mold to insulate the joint between the strip electrode and the lead wire, but instead molds the substrate itself and casts the mold into the molded portion, thereby eliminating the need for conventional casting. There is no need to position and glue molds, reducing man-hours, facilitating manufacturing automation, and making it possible to construct highly reliable insulation specifications without leaking of the molding material.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 shows a cross-sectional view of the terminal insulating portion of a sheet heating element in an embodiment of the present invention. In Figure 1, 8
is an insulating substrate, and a heating resistor coating film 9 is applied to the surface thereof. Reference numeral 10 denotes a band-shaped electrode located at the end of the heating resistor coating film 9. The heating resistor coating film 9. The strip electrode 1o is insulated with an insulating protective film 12. A hole is provided in a portion of the insulating protective film 12 corresponding to the end of the strip electrode 10, so that the end of the strip electrode 1o is exposed, and a recess 13 is formed around the hole by pressing or the like.

The strip electrode.

The lead wire 11 is fixed to the exposed part of the lead wire 11 by soldering or the like, and the fixed part is insulated by casting a molding material 14 into the recess 13 and hardening it.

Therefore, there is no need to use a separate mold for casting as in the past, reducing man-hours for positioning and gluing the mold, facilitating manufacturing automation, and eliminating leakage of casting material due to poor mold adhesion. Configure reliable insulation specifications.

Effects of the Invention As described above, the present invention forms a recess around the joint between the band-shaped electrode and the lead wire of a planar heating element, and casts the mold into the recess, thereby attaching a conventional casting mold separately. , compared to the method of casting into it, the manufacturing process can be simplified, manufacturing automation can be facilitated, and highly reliable insulation specifications can be constructed.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the terminal insulating part of a sheet heating element according to an embodiment of the present invention, Fig. 2 is a front view of Fig. 1, and Fig. 3 is a sectional view of the terminal insulating part of a conventional sheet heating element. FIG. 4 is a front view of FIG. 3. 8...Insulating substrate, 9...Heating resistor coating, 1°...Strip electrode, 13...Concave portion, 14... Cast material. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
figure

Claims (1)

[Claims] A heating resistor coating formed on the surface of an insulating substrate, a pair or more of strip electrodes provided along both ends of the heating resistor coating, and lead wires and insulation protection connected to the ends of the strip electrodes. A method for manufacturing a planar heating element comprising a film, a recess is provided around the band-shaped electrode and the lead wire joint, and an insulating casting material is injected into the recess.