JPH09191987A - Fogging-proof mirror - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the surface of a mirror from being fogged by using a sheet type heater. SOLUTION: A sheet type heater 2 pasted to the reverse side of a mirror plate 1 is formed out of a flat carbon heating body 3 having both sides covered with insulation materials 4 and 5. In addition, a heat reflective sheet 8 and a waterproof layer 9 are stacked on one side of the heater 2. and a water resistant adhesive sheet 10 is stacked on the other side, all integrated as a composite sheet. The insulation materials 4 and 5 are glass epoxy resin sheets and the heat reflective sheet 8 is an aluminum foil. Also, the waterproofing layer 9 is an epoxy resin layer. According to this construction, the flat carbon heating body 3 is covered with a multilayer having a high moistureproof function as well as a high waterproof function. The ingress of moisture and humidity into the heating body 3 from the outside is thereby prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-fog mirror installed in a high humidity atmosphere, particularly in a bathroom.

[0002]

2. Description of the Related Art A method of attaching a heater to a mirror plate to remove the fog of a mirror and heating the mirror plate from the back surface is well known in the art, and a ceramic heater has been used exclusively for this purpose. . Ceramic heater is P
The TC thermistor element is used as a constant temperature heating element.

[0003]

By the way, waterproofness and moisture resistance are required for use as a heater for a mirror installed in a high humidity environment such as in a bathroom where it is directly exposed to water. In the case of a ceramic heater, the thermistor element can be sealed with a resin or other insulating material for waterproofing and moistureproofing. However, there is a limit to the size of the ceramic heater, and it is necessary to disperse and install multiple heaters in the important parts of the mirror. Each heater is waterproofed and the power lead wire is connected. Must.

On the other hand, as a sheet-like heater, there is a carbon-based surface heating element. If a carbon-based surface heating element is used for the heater of the end plate, even if the end plate is large, it is possible to cover the entire surface area and attach one heater, and the wiring of the power supply lead wire can be completed at two locations. be able to.

The conventional carbon-based surface heating element uses a polyester film having a thickness of about 100 μm as an insulating material for the surface heating element. The polyester film has low moisture resistance and may be directly exposed to water by a heater. Although it can be used for a mirror such as a bathroom, it is dangerous because it may cause an electric shock if used for a mirror in a bathroom where the heater is directly exposed to water in a high humidity environment close to saturation.

An object of the present invention is to provide an anti-fog mirror which can be installed even in a bathroom by using a carbon-based surface heating element that has been subjected to a high humidity resistance and a high water resistance treatment as a heater.

[0007]

In order to achieve the above object, the anti-fog mirror according to the present invention is an anti-fog mirror having a sheet-shaped heater on a mirror plate, and the sheet-shaped heater is a carbon-based surface heating element. Both sides are covered with insulating material, a heat reflecting sheet is attached to one surface, a waterproof layer is laminated on the surface of the heat reflecting sheet to be integrated as a composite sheet, and the insulating material is a glass epoxy resin sheet. The waterproof layer is an epoxy resin layer, and the other surface of the sheet-shaped heater is attached to the back surface side of the end plate.

The heat reflection sheet is an aluminum foil,
The waterproof layer prevents corrosion of the aluminum foil.

Further, the sheet-like heater is attached to the central region of the end plate except the peripheral portion.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, in the present invention, a sheet-like heater 2 is attached to the back surface (silver surface side) of an end plate 1. In FIG. 3, the sheet-like heater 2 is one in which both sides and the periphery of the carbon-based surface heating element 3 are covered with insulating materials 4 and 5.

In the present invention, a glass epoxy resin sheet (thickness 300 μm) is used for the insulating materials 4 and 5. The glass epoxy resin sheet is a sheet obtained by impregnating glass fiber with an epoxy resin and thermally curing the glass fiber, and the thermally cured sheet has high waterproof and moisture proof properties. The carbon-based surface heating element 3 is one in which carbon is attached as an electric resistor to a cloth surface of a woven cloth of synthetic fibers, for example, a woven cloth of polyester fibers, and electrodes 6 are provided in parallel on both end edges of the cloth surface.
Its thickness is about 100 μm. Sheet heater 2
A heat reflection sheet 8 is laminated on the outer surface of one of the insulating materials 4 with a thermosetting adhesive 7 if necessary, and the outer surface is covered with a waterproof layer 9. The heat reflection sheet 8 preferably uses aluminum foil (thickness 30 to 100 μm). Aluminum foil is
The heat generated by the carbon-based surface heating element 3 is reflected and has a soaking effect, and further cuts off the transfer of moisture from the waterproof layer 9 to the carbon-based heating element 3. The waterproof layer 9 is an epoxy resin layer (having a thickness of 50 to 100 μm or less). Epoxy resin is thermosetting and has excellent waterproofness and moisture resistance. A heat reflection sheet 8 is laminated on the entire surface of the insulating material 4 that covers both sides and the periphery of the carbon-based surface heating element 3 to prevent moisture transmission from the end surface of the sheet-shaped heater 2.

The outer surface of the other insulating material 5 of the sheet-shaped heater 2 is a surface to be attached to the back surface of the end plate 1. The water resistant adhesive sheet 10 is previously attached to the outer surface of the insulating material 5 which is the attaching surface,
It is convenient to cover the surface with release paper. When the sheet-shaped heater 2, the heat reflection sheet 8 and the waterproof layer 9 are laminated by heat pressing at 150 to 200 ° C., the insulating material 5 is formed.
The epoxy resin is solidified, and at the same time, the heat reflection sheet 8 is adhered to and integrated with the waterproof layer 9 and the insulating material 5 to form a composite sheet in which the upper and lower surfaces and the peripheral edge of the carbon-based surface heating element 3 are covered with the respective layers. . The thickness of the composite sheet is at most 1.5
mm or less.

The electrodes 6 of the carbon-based surface heating element 3 are insulated, waterproofed and moisture-proofed with an epoxy resin, and the terminals 11 are led out to the waterproof layer 9 side.
1, a power supply lead wire 12 is connected, and an epoxy resin is added to a connecting portion between the terminal 11 and the power supply lead wire 12 for waterproof and moistureproof treatment.

To attach the sheet-shaped heater 2 to the mirror plate 1, the release paper is peeled off from the surface of the water-resistant pressure-sensitive adhesive sheet 10 and the pressure-sensitive adhesive surface is attached to the back surface (silver surface) side of the mirror plate 1. At the time of sticking No. 2, it is desirable to stick to the back surface of the end plate 1 with a space d of at least about 3 to 5 cm around the sheet-like heater 2 as shown in FIG. In the bathroom, even the back of the end plate 1 may be bathed in water,
If there is a space between the edge of the end plate 1 and the sheet-shaped heater 2, the chance of the sheet-shaped heater 2 being wetted is significantly reduced.

The mirror installed in the bathroom is usually coated with a waterproof film 13 to a thickness of 3 to 4 mm in order to protect the silver surface on the back surface of the mirror. Therefore, the water-resistant adhesive sheet 10 of the sheet-shaped heater 2 is actually the end plate 1
Is affixed to the surface of the waterproof film 13. Since the silver surface of the end plate is a conductor, it is important to ensure electrical insulation between the carbon-based sheet heating element 3 and the silver surface. The water-resistant pressure-sensitive adhesive sheet 10 is not always necessary, and an adhesive may be applied to the surface of the insulating material 5 of the sheet-shaped heater and directly attached to the back surface of the end plate.

The sheet-shaped heater 2 energizes the carbon-based sheet heating element 3 to generate heat at a temperature of about 40 ° C. to 50 ° C., heats the end plate 1 to deposit water droplets on the glass surface of the end plate 1. To evaporate.

[0017]

According to the anti-fog mirror of the present invention, the outer surface of the carbon-based surface heating element as the sheet-like heater is made of a glass epoxy resin sheet, an aluminum foil and an epoxy resin layer, both of which are moisture-proof and waterproof. It has three layers of excellent coating, the inner surface is coated with an epoxy resin layer, and it is laminated and integrated as a composite sheet on the back surface of the end plate, so the effect of moisture on the carbon surface heating element is completely eliminated. It can be cut off, there is no delamination, and the aluminum foil is protected by the epoxy resin so that it does not corrode, and the moisture resistance and water resistance of the sheet-like heater are dramatically improved. It can be used for a long time in a bathroom where it is exposed to water.

According to the present invention, a sheet heater can be used in the bathroom in place of the conventional ceramic heater, the wiring of the power supply lead wire can be simplified, and the cost can be greatly reduced as compared with the anti-fog mirror with a ceramic heater. Can be achieved.

[Brief description of the drawings]

FIG. 1 is a rear view of an end plate showing an embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is an exploded view of FIG. 2;

[Explanation of symbols]

 1 End Plate 2 Sheet Heater 3 Carbon Surface Heating Element 4, 5 Insulation Material 6 Electrode 7 Thermosetting Adhesive 8 Heat Reflective Sheet 9 Waterproof Layer 10 Water Resistant Adhesive Sheet 11 Terminal 12 Power Lead Wire 13 Waterproof Film

Claims (3)

[Claims] 1. An anti-fog mirror having a sheet-shaped heater on a mirror plate, wherein the sheet-shaped heater is a carbon-based surface heating element covered on both sides with an insulating material, and a heat-reflecting sheet is attached to one surface of the heating element. ,
A waterproof layer is laminated on the surface of the heat reflection sheet to be integrated as a composite sheet. The insulating material is a glass epoxy resin sheet, the waterproof layer is an epoxy resin layer, and the other surface of the sheet-shaped heater is the back surface of the end plate. An anti-fog mirror that is attached to the side. 2. The anti-fog mirror according to claim 1, wherein the heat reflection sheet is an aluminum foil, and the waterproof layer is for preventing corrosion of the aluminum foil. 3. The anti-fog mirror according to claim 1, wherein the sheet-shaped heater is attached to the central region of the end plate except the peripheral portion.