JP2987698B2 - Surface heating element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface heating element such as a panel heater.

[0002]

2. Description of the Related Art A mirror installed in a humid place such as a bathroom, or a window glass having a large temperature difference between the inside and outside (a vehicle window glass, etc.) is liable to be cloudy on the surface, and cannot be used properly. is there.

In order to cope with such a situation, a surface heating element in which a conductive material is attached to the front surface of the substrate and a connection portion with a power supply is formed on the rear surface of the substrate is attached to the rear surface of the mirror. Means for increasing the temperature of the mirror surface to prevent fogging are already known.

[0004] In the case of a surface heating element installed on the back surface of a mirror or the like, since the surface heating element is installed in a high-temperature, high-humidity place, a connection portion with a power supply provided on the back side of the surface heating element may corrode or cause insulation failure. You need to avoid it.

The connection structure of the conductive wire connection portion of such a surface heating element has already been proposed by the present inventor (Japanese Utility Model Publication No. 7-51753).

FIG. 5 is a sectional view showing a connection structure of a conductive wire connection portion in a surface heating element that has already been proposed.

As shown in FIG. 5, a conductive film 1 on which a heating layer is formed is formed on the front side (lower side in the figure) of a substrate 1.
The heating element a composed of the substrate 1 and the conductive film 11 is covered with an outer skin b for ensuring insulation. Conductive band 1 such as a conductive tape adhered to the electrode portion of the heat generating layer of conductive film 11
A part of 2 penetrates the substrate 1 and reaches the back side of the substrate 1,
It is connected to the power supply lead wire 3. 41 is a terminal cover body, 42 is an inner frame, 51 is an internal filler having a strong adhesive force, 52 is an excellent adhesiveness to the covering material of the lead wire 3 and a performance of protecting the internal filler 51 from moisture and moisture. Is an external filler having

[0008]

In the surface heating element having the above-described structure for connecting the conductive wires, the conductive band 12 is inserted into the substrate 1 outside the conductive film 11 on which the heat generating layer is formed. Since the holes need to be provided, the terminal cover body 41 installed on the back surface side (the upper side in FIG. 5) of the substrate 1
Has to be located outside the conductive film 11 as shown in FIG. 6 or FIG.

Therefore, in such a surface heating element, the terminal cover body 41 must be located outside the conductive film 11, so that the mounting position of the terminal cover body 41 is limited and the area around the surface heating element is limited. The dimensions have to be larger than the peripheral dimensions of the conductive film 11 by the size of the terminal cover body 41.

[0010] It is an object of the present invention to increase the occupancy of the conductive film on which the heat generating layer is formed in the surface heating element, and to select a desired position of the conductive wire connecting portion provided on the back side. An object of the present invention is to provide a surface heating element having a structure that can be performed.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a heating element in which a conductive film having a heating layer formed thereon is laminated on the surface side of a substrate to form a heating element. In a surface heating element in which both front and back surfaces are covered with a skin, one end is connected to the heat generation layer, and the other end is a conductive band connected to a lead wire from a power supply on the back surface side of the substrate, and an edge of the substrate. A conductive band bent from the front side to the back side of the substrate, and a protective cover for covering the other end of the conductive band except for a connection portion with the lead wire. Things.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view showing a configuration of an embodiment of the present invention, and FIG. 2 is an enlarged view showing a configuration of a conductive line connecting portion.

1 and 2, the same reference numerals as those in FIG. 5 indicate the same components. Here, reference numeral 30 denotes a rubber upper cover of the terminal cover.

As shown in FIG. 1, in the present embodiment, on the front side of the substrate 1 (the lower side in FIG. 1), two heat generating layers formed on the conductive film 11 are connected at one end. The conductive strips 12 are disposed on the rear surface side (the upper side in FIG. 1) of the substrate 1 by bending along the edge of the substrate 1.

FIG. 3 is a plan view of the present embodiment viewed from the back side before the terminal cover body is attached. As shown in FIG. 3, the ends of the two conductive strips 12 located on the back surface side are arranged at close positions, and at this position, they are connected to the lead wires 3 as shown in FIG. .

As described above, in the present embodiment, the substrate 1
The conductive strips 12 are bent along the edges of the conductive strips 12 so as to be disposed on the back side of the substrate 1. By selecting the position of the sheath, the conductive wire connection portion can be easily provided at a position on the substrate 1 desired by the user.

In FIG. 2 and FIG.
2 is a protective cover that covers the front end portion of the lead wire 2 with only the connection portion with the lead wire 3 exposed.

The protective cover 20 is made of a hard synthetic resin material such as a polypropylene film or a polyester film, and is adhered to the conductive band 12 and the substrate 1 with an adhesive or a double-sided tape.

As described above, in the present embodiment, since the end of the conductive band 12 located on the back surface side is firmly fixed to the substrate 1 by the protective cover 20, the manufacturing process such as the mounting process of the outer cover b is performed. The end of the conductive strip 12 does not move from a predetermined position.

Next, the manufacturing method of this embodiment will be described.

First, the conductive film 1 on which the heating layer is formed
1 are attached to the front surface side of the substrate 1, and one ends of the two conductive strips 12 are connected to the heat generating layer of the conductive film 11, respectively. The two conductive strips 12 are arranged along the substrate 1 respectively,
Next, the substrate 1 is bent along the edge, and is disposed such that the front end thereof is located at a predetermined position on the back side of the substrate 1. The distal ends of the two conductive strips 12 are fixed on the substrate 1 by the protective cover 20 in a state where the connection portion with the lead wire 3 is exposed.

The jacket b is mounted in the above-described state, and the jacket b of the conductive wire connection portion is cut off to provide the window 60 (see FIG. 3). The lead wire 3 is connected to the connection part of the conductive band 12 exposed in the window part 60 by soldering or the like. This lead wire 3
A terminal cover main body 41 and an inner frame 42 are disposed at a connection portion of the conductive band 12 and the inner band 42, and an inner filler 51 is filled in the inner frame 42,
After filling the terminal cover body 41 with the external filler 52,
A rubber upper lid 30 is attached. (See FIG. 5).

The manufacturing of this embodiment is performed as described above. Here, when the window b is cut and the window 60 is provided, since the tip of the conductive band 12 is protected by the hard protective cover 20, the conductive band 12 is cut off in the process of forming the window 60. It will not be done.

A manufacturing method is also conceivable in which a window 60 is provided in a predetermined position of the jacket b in advance, and the jacket b having the window 60 is attached to the heating element a. In the manufacturing method, precision is required for the alignment between the window 60 and the heating element a, and the manufacturing efficiency is significantly reduced. Therefore, such a manufacturing method is not preferable.

In the embodiment described above, the conductive wire connecting portion is composed of the terminal cover body 41, the inner frame 42, and the inner filler 5.
2 and the external filler 51, but this configuration does not limit the present invention, and the conductive wire connection portion may have any configuration. Further, the outer skin b is indispensable to ensure the insulation of the heating element a and the conductive band 12, but specifically, depending on the situation where the surface heating element is used, for example, waterproof, It is constituted by suitably using materials having various properties such as moisture proof properties.

[0027]

As described above, according to the present invention, the occupation ratio of the conductive film on which the heat generating layer is formed in the surface heating element is increased, and the installation position of the conductive wire connecting portion provided on the back side is desired. You can choose the position.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the sectional view shown in FIG.

FIG. 3 is an explanatory diagram of a configuration on a back surface side of the embodiment shown in FIG. 1;

FIG. 4 is a plan view showing a configuration on the back surface side of the embodiment shown in FIG. 1;

FIG. 5 is a cross-sectional view showing a configuration of a conductive wire connecting portion of a conventional surface heating element.

FIG. 6 is an explanatory view of a conventional surface heating element.

FIG. 7 is an explanatory view of a conventional surface heating element.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 3 Lead wire 11 Conductive film 12 Conductive band 20 Protective cover 30 Terminal cover top lid 41 Terminal cover main body 42 Inner frame 51 Internal filler 52 External filler 60 Window a Heating element b Outer shell

Claims (2)

(57) [Claims] 1. A heating element in which a conductive film having a heating layer formed thereon is adhered in a layer on the surface side of a substrate to form a heating element, and both sides of the heating element are covered with outer skins. A conductive band that is connected to a layer and the other end of which is connected to a lead wire from a power supply on the back side of the substrate, and that bends along the edge of the substrate from the front side to the back side of the substrate. A surface heating element comprising: a conductive band; and a protective cover that covers the other end of the conductive band except for a connection portion with the lead wire. 2. The surface heating element according to claim 1, wherein the protective cover is bonded to the conductive band and the substrate.