JPH081226U - Sheet heating element that generates heat at low voltage - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] It is used to prevent fog in mirrors used in bathrooms and humid places. [Structure] A conductive film having a heat generating layer 22 formed on the surface thereof is attached onto a synthetic resin substrate 21, and the upper surface thereof is covered with a protective layer of a synthetic resin film, and both ends of the heat generating layer 22 are covered. Conductive bands 31 and 31 'are drawn out from the provided electrode 3 to reach the back surface of the substrate to form a heating element, and the entire front and back surfaces of the heating element are covered with a skin b excellent in waterproofness, moisture resistance and gas permeation prevention. It is covered and the end of the conductive band is pulled out from the outer cover. [Effect] The entire mirror surface that requires antifogging can be uniformly antifogging.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a planar heating element, particularly a planar heating element that can be effectively used for anti-fog of a mirror installed in a humid place and that is thin and flexible and generates heat at low voltage. It is a thing.

[0002]

[Prior art]

 It is often experienced that mirrors installed in humid places such as bathrooms cannot be used properly because the mirror surface becomes cloudy as the indoor humidity rises and the temperature difference from the outside air expands.

As means for dealing with such a state, a constant space is formed on the back surface of the mirror, and a hot water pipe for circulating a large temperature difference between the room temperature and the mirror surface temperature is circulated in this space. It is also possible to deal with this problem, or by installing a heating wire such as a linear heater on the back of the mirror or a heating element made of a conductive material such as carbon on the substrate to raise the mirror surface temperature to prevent fogging. Known to correspond.

[0004]

[Problems to be solved by the device]

 However, among the countermeasures described above, 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, especially the thickness thereof becomes thick, resulting in an extremely large-scaled structure, and also in terms of weight. It is heavy and has the drawback of increasing manufacturing costs.

Further, in the case of a structure in which a heating wire is attached to the back surface of the mirror or a heating element processed by processing a conductive material such as carbon on the substrate is attached, particularly in the former case, the linear heating element is in contact with the heating element. It has been pointed out that it is difficult to heat the entire surface of the mirror in a planar and uniform manner, because only the part that surrounds the mirror and its surroundings are heated linearly, and in the latter case, the electrical resistance of the heating element used is generally It has been pointed out that it is difficult to form a conductive film having high and uniform resistance.

In addition, in any of the above-described known structures, a voltage of 100 V is required as a power source in any structure, and therefore, in a place where safety (safety for preventing electric shock) is required such as a bathroom. There was also a drawback that it could not be used.

[0007]

[The purpose of the device]

 The present invention addresses these problems in view of such circumstances, and can be easily attached to the back surface of a mirror to be installed in a humid place such as a bathroom or a washroom. It is intended to provide a planar heating element capable of uniformly and efficiently heating the entire back surface and exhibiting an excellent antifogging effect and generating heat at a low voltage.

Another object of the present invention is to be thin, lightweight and flexible as a whole, to be constructed at low cost, and to be able to exert a sufficient effect at a low power supply voltage of 29 V or less. The present invention is intended to provide a sheet heating element that heats up.

[0009]

[Means for Solving the Problems]

 The present invention is a planar heating element in which a substrate and a conductive film are integrally formed into a planar heating element, and the heating element is covered with an outer skin using a multilayer composite film that is impermeable to water, moisture and gas. The heating element is made of a synthetic resin sheet or a substrate made of a synthetic resin film on one side, and the surface of the synthetic resin substrate is made of a metal layer having a low electric resistance of 5 to 50 square ohms (Ω / □) or less. The conductive film with the heat generating layer is laminated and integrated.The two electrodes formed on the heat generating layer are connected to one end of each of the two conductive bands and the other of the conductive bands. Corresponding by configuring the end part as a planar heating element that penetrates through the guide hole and outer skin formed on the board and is drawn out to the surface side and electrically connected to the power supply wire to generate heat at a low voltage There is.

[0010]

【Example】

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

The sheet heating element generally indicated by A is composed of a heating element a and an outer cover b covering the heating element a.

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

The substrate 1 is formed by using a synthetic resin film or synthetic resin sheet having heat resistance and flexibility.

The conductive film 2 laminated on the upper surface of the substrate 1 has an electric resistance of 5 to 50 square ohms (Ω / □) or less on the surface of the synthetic resin film substrate 21 by sputtering or other means. It has a structure in which a heating layer 22 formed by adhering and forming a low metal layer is integrated.

The conductive film 2 is integrated with the upper surface of the substrate 1 via an adhesive layer 23 provided on the back surface of the synthetic resin film substrate 21.

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

One ends of the conductive bands 31, 31 ′ are connected to the ends of the two electrodes 3, 3 respectively so that they are electrically conducted.

The conductive bands 31, 31 ′ are formed by using a conductive tape or other electrically conductive material, and the other ends of the conductive bands 31, 31 ′ are guide holes formed in the substrate 1. 11 is penetrated and drawn out to the back surface side of the substrate 1, and further to the outside of the outer cover 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 which is filled with a filler 43 made of silicone resin or butyl rubber having excellent waterproofness and moisture resistance, and the inside of which is a conductive band. A sealant 42 such as an epoxy resin is filled in to fix the connection between the power lines 5 and 31 and 31 'and to improve the insulation.

Both the front and back surfaces of the sheet heating element a and the inner surface of the outer cover b are bonded and integrated with each other with appropriate adhesives 6 and 6, and an intermediate portion between the back surface of the substrate 1 and the outer cover b is used. Adhesives 6 and 6 are interposed between the front surface of the conductive film 2 and the back surface of the outer cover b to bond them.

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

The outer skin b is formed by using a multilayer composite film that is impermeable to water, moisture and gas, and has a peripheral portion where two outer skins b covering the front and back surfaces of the planar heating element a overlap each other. By closing the welding of the heating element a, the waterproofness, moisture resistance and gas permeation resistance of the heating element a are improved.

FIG. 4 shows an example in which the sheet heating element A of the present invention is used in 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 insulated and protected by a heat insulating material 7.

[0024]

[Effect of device]

 The effects of the present invention configured as described above are as follows.

(1) Since the entire planar 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. Moreover, 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 uneven heat retention does not occur and thermal efficiency is excellent. It was possible to obtain a heating element.

Further, it has excellent thermal conductivity when generating heat, and can exhibit an antifogging effect in an extremely short time.

(3) Since the entire planar heating element a is covered with the outer cover b, the entire planar heating element has excellent waterproof, moisture-proof and gas permeation preventive properties, and is extremely effective anti-fogging. The effect can be exerted.

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

(5) Since the power source that can be used is extremely low voltage of 29 V or less, it is safe and economical.

[Brief description of drawings]

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

FIG. 2 is a bottom view of the planar heating element.

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

FIG. 4 is a vertical cross-sectional side view showing an example in which a planar heating element is attached to the back surface of a mirror.

[Explanation of symbols]

 A Surface heating element a Heating element b Skin 1 Board 11 Guide hole 2 Conductive film 21 Board 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 (2)

[Scope of utility model registration request] 1. A surface on which a heating element a, which is formed by integrating a substrate 1 and a conductive film 2 into a planar shape, is covered with an outer cover b using a multilayer composite film having no water vapor permeability, moisture vapor permeability and gas permeability. The heat generating 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. The conductive film 2 having the heating layer 22 made of a metal layer having a low electric resistance is laminated and integrated, and the two electrodes 3 and 3 formed on the heating layer 22 have two conductive bands 31 and 31 '. Of the conductive bands 31 and 31 'are connected to one end of each of the conductors, and the other ends of the conductive bands 31 and 31' penetrate through the guide hole 11 and the outer cover b formed on the substrate 1 and are drawn out to the surface side to electrically connect to the power supply wire. A planar heating element that generates heat at a low voltage. 2. A planar heating element which generates heat at a low voltage according to claim 1, wherein the inside of the outer cover b accommodating the heating element a is evacuated and then closed by welding.