JP2564047Y2 - Planar heating element that generates heat at low voltage - Google Patents

Description

[Detailed description of the invention]

[0001]

Industrial Applicability The present invention can be effectively used for anti-fog of a planar heating element, particularly a mirror installed in a humid place, and is a thin and flexible surface which generates heat at a low voltage. The present invention relates to a heating element in a shape of a circle.

[0002]

2. Description of the Related Art A mirror installed in a humid place, such as a bathroom, often experiences a fogging of the mirror surface as the indoor humidity rises or the temperature difference from the outside air widens, making it impossible to use the mirror properly. That is.

In order to cope with such a situation, a fixed space is formed on the back surface of the mirror, and a hot water pipe is circulated in the space to prevent a large temperature difference between the room temperature and the mirror surface temperature. It is designed to raise the mirror surface temperature by mounting a heating wire such as a linear heater on the back of the mirror or a heating element processed from a conductive material such as carbon on the substrate to respond to anti-fog. It is known to

[0004]

However, of the above-mentioned corresponding means, in the structure in which the hot water pipe is arranged in the gap formed on the back surface of the mirror, the entire structure of the mirror, particularly the structure whose thickness is large and which is extremely large, is required. It is disadvantageous in that it is heavy in weight and that the production cost increases.

In the case of a structure in which a heating wire is attached to the back surface of a mirror or a heating element formed by processing a conductive material such as carbon on a substrate, particularly in the former case, a linear heating element is in contact with the heating element. Only the part and its surroundings are heated linearly,
It is pointed out that the entire surface of the mirror is difficult to be heated in a planar and uniform manner, and in the latter case, the electric resistance of the heating element used is generally high and a conductive film having uniform resistance is formed. Difficulty is pointed out.

[0006] In addition, in the above-mentioned known structures, a voltage of 100 volts is required as a power supply in any case, so that
There is also a disadvantage that it cannot be used in places where safety (safety for preventing electric shock) such as a bathroom is required.

[0007]

[Purpose of the Invention] In view of such circumstances, the present invention is intended to address these problems, and can be easily mounted on the back of a mirror installed in a humid place such as a bathroom or a washroom. Further, it is an object of the present invention to provide a planar heating element that can uniformly and efficiently heat the entire rear surface of the mirror and that generates heat at a low voltage and can exhibit an excellent anti-fog effect.

Another object of the present invention is to provide a thin, lightweight and flexible device as a whole, which can be constructed at a low cost, and which can achieve a sufficient effect at a low voltage of 29 V or less. It is an object of the present invention to provide a planar heating element that generates heat in the above.

[0009]

According to the present invention, a heating element formed by integrating a substrate and a conductive film into a planar shape is formed by a skin using a multilayer composite film having no water permeability, moisture permeability and gas permeability. A sheet heating element having a coating configuration, wherein the heating element has a surface resistance of 5 to 50 square ohms (Ω / □) or less on one surface of a substrate made of a synthetic resin sheet or a synthetic resin film, and on the surface of the synthetic resin substrate. A conductive film with a heat generating layer formed of a metal layer having a low electric resistance is laminated and integrated, and two electrodes formed on the heat generating layer are connected to two conductive bands and one end of each. And
The other end of the conductive strip penetrates through the guide hole and the outer skin formed on the substrate and is drawn out to the surface side, and is electrically connected to a power supply wire to form a planar heating element that generates heat at a low voltage. Yes, it is.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

A sheet heating element generally indicated by A is a heating element a
And an outer skin b covering the same.

The heating element a has a structure in which a conductive film 2 is integrated in a layer on the upper surface of a substrate 1.

The substrate 1 is made of a heat-resistant and flexible synthetic resin film or sheet.

A conductive film 2 laminated on an upper surface of a substrate 1
The heat-generating layer 22 formed by attaching a metal layer having a low electric resistance of 5 to 50 square ohms (Ω / □) or less by sputtering or other means on the surface of a synthetic resin film substrate 21 is integrated. It has a structure.

The conductive film 2 is integrated with the upper surface of the substrate 1 through an adhesive layer 23 interposed on the back surface of the substrate 21 made of a synthetic resin film.

Reference numerals 3 and 3 denote electrodes formed on both ends of the upper surface of the heat generating layer 22. The electrodes 3 and 3 are made of a conductive paint or the like which is applied and adhered onto the heat generating layer 22.

At the ends of the two electrodes 3, 3, conductive bands 31, 3 are provided.
One ends of the 1 'are connected to each other to make them electrically conductive.

The conductive strips 31 and 31 'are formed using a conductive tape or another material having electrical conductivity, and the other ends of the conductive strips 31 and 31' are provided with guide holes formed in the substrate 1. 11
Is drawn out to the back side of the substrate 1 and further drawn out of the outer skin b, and then electrically connected to the power supply wire 5.

Reference numeral 41 denotes a terminal cover mounted on the outer cover b. The inside of the terminal cover is filled with a filler 43 made of silicone resin or butyl rubber or the like having excellent waterproof and moisture-proof properties. , 31 'and the power supply wire 5 are filled with a sealant 42 such as an epoxy resin in order to improve insulation.

The front and back surfaces of the planar heating element a and the inner surface of the outer skin b are bonded and integrated through appropriate adhesives 6 and 6, and an intermediate portion between the back surface of the substrate 1 and the outer skin b, Adhesives 6 and 6 are interposed between the front surface of conductive film 2 and the back surface of outer skin b for adhesion.

As the material used for the adhesive 6, it is possible to freely select a double-sided adhesive tape, a heat sealing material which exhibits an adhesive effect by heating, and the like.

The outer skin b is formed using a multilayer composite film having no water permeability, moisture permeability or gas permeability, and the peripheral portion where the two outer skins b covering the front and back surfaces of the sheet heating element a are overlapped. By closing the welding, the waterproofness, moistureproofness and gas permeation prevention of the heating element a are enhanced.

FIG. 4 shows an example in which the sheet heating element A of the present invention is used as a mirror for the purpose of preventing moisture. After the sheet heating element A of the present invention is adhered to the back surface of the mirror M with a double-sided tape or the like. The back side is heat-insulated and protected by a heat insulating material 7.

[0024]

[Effects of the Invention] The effects of the present invention configured as described above are as follows.

(1) Since the entire sheet heating element can be formed into an extremely thin sheet, the entire structure can be formed extremely thin even when these heating elements are attached to the back surface of the mirror. There is an advantage that the weight can be reduced.

(2) Since the heating element is formed in a planar shape, it is possible to uniformly heat the entire back surface of the mirror which requires heating and heat retention, so that heat retention non-uniformity does not occur and heat efficiency is excellent. A heating element could be obtained.

Further, it has excellent thermal conductivity at the time of heat generation, and can exhibit an antifogging effect in a very short time.

(3) The entire heating element a formed in a plane is
Since the sheet heating element is configured to be covered with the outer skin b, the entire sheet heating element is excellent in waterproofness, moistureproofness and gas permeation prevention properties, and can exhibit an extremely effective antifogging effect.

(4) The mirror can be effectively used for a mirror installed in a humid place such as a bathroom or a washroom.

(5) The power supply that can be used is extremely low voltage of 29 volts or less, so it is safe and economical.

[Brief description of the drawings]

FIG. 1 is a plan view of a sheet heating element.

FIG. 2 is a bottom view of a sheet heating element.

FIG. 3 is an enlarged cross-sectional view of a part showing a main part.

FIG. 4 is a longitudinal sectional side view showing an example in which a planar heating element is mounted on the back surface of a mirror.

[Explanation of symbols]

 A Planar heating element a Heating element b Skin 1 Substrate 11 Guide hole 2 Conductive film 21 Substrate 22 Heating layer 23 Adhesive layer 3 Electrode 31 Conductive band 31 'Conductive band 41 Terminal cover 42 Filler 43 Sealant 5 Power supply wire 6 Adhesive 7 Insulation M Mirror

Claims (1)

(57) [Scope of request for utility model registration] 1. A surface in which a heating element a in which a substrate 1 and a conductive film 2 are integrated and formed in a planar shape is covered with an outer skin b using a multilayer composite film having no water permeability, moisture permeability and gas permeability. The heating element a has a surface resistance of 5 to 50 square ohms (Ω / □) or less on one surface of the substrate 1 made of a synthetic resin sheet or a synthetic resin film, and on the surface of the synthetic resin substrate 21. A conductive film 2 having a heat generating layer 22 formed of a metal layer having a low electric resistance is laminated and integrated. Two electrodes 3, 3 formed on the heat generating layer 22 have two conductive bands 31 and 31 '. And the other ends of the conductive strips 31 and 31 'are pulled out to the surface side through the guide hole 11 and the outer cover b formed in the substrate 1 and electrically connected to the power supply wire. Surface heating that generates heat at low voltage Body.