JP3066127U - Large anti-fog metal mirror - Google Patents

Abstract

(57) [Summary] [Purpose] A large-sized mirror that has high strength against impact, is not damaged, is easy to manufacture, transport, and attach, and maintains a set temperature without using an automatic controller. Wear the body and heat the metal mirror to prevent the mirror surface from fogging. A heat generating plate covered with a fire-resistant insulating outer cover is attached to the back of a metal mirror made of a stainless steel plate or a copper plate, and a heat insulating plate is attached outside the heat generating plate. The heating element 3 is characterized in that conductive particles such as carbon and graphite are blended therein and are made of a conductive resin that generates heat while maintaining a substantially constant set temperature by energization.

Description

[Detailed description of the invention]

[Industrial application field] The strength is higher than a mirror made of a glass plate or a plastic plate, there is no breakage during production, transportation and construction, and the set temperature can be adjusted without using an automatic control device. The present invention relates to a large-sized mirror that heats a metal mirror to prevent clouding of the surface by attaching a planar heating element to be maintained.

[Prior Art] Most conventional mirrors use a glass plate or a plastic plate such as an acrylic resin and have a reflective film formed on the back surface. However, these glass plates and plastic plates are easily damaged. Therefore, in the case of large mirrors, not only at the time of manufacture but also at the time of transportation, storage and installation work, techniques for preventing damage and special tools were required. In addition, after being mounted on a wall or the like, damage or destruction is likely to occur due to an impact received from a human body or an object, or a vibration such as an earthquake, and there is also a problem in safety. This problem becomes more serious as the size of the mirror becomes larger, and for this reason, the thickness of the glass plate becomes unnecessarily thick or an expensive tempered glass plate is used for strength reasons. Not only that, it was a factor in soaring material costs.

[0003] Since most large mirrors are installed on a wall or the like, as the size of the mirror becomes larger, a fogging phenomenon is more likely to occur. As a means for preventing this fogging, a glass plate material or a plastic plate material is used. Although heating is performed by a heating element that generates heat by electric heating, it was necessary to add a temperature control device with a temperature sensor to the heating element in order to prevent fires and prevent danger. In addition, as the size of the mirror increases, it becomes more difficult to maintain a uniform temperature over the entire surface, and the temperature control device for preventing adverse phenomena such as distortion and cracks caused by differences in the thermal expansion of the plate material that constitutes the mirror automatically In addition, the performance of uniform heating on the entire surface was required, and the system became complicated, and the cost of the entire mirror was greatly increased.

[Problems to be Solved by the Invention] The present invention does not break to solve all the problems of workability, safety, and economy that occur in a large mirror made of a conventional glass plate material or plastic plate material. This is a combination of a mirror made of a metal plate and an unnecessary surface heating element of an automatic temperature control device covered with a fire-resistant insulating outer cover. Therefore, by making the mirror a metal plate, there is no danger associated with damage and safety is ensured.By heating the metal mirror to the uniform temperature set by the sheet heating element, it becomes a large mirror The fogging phenomenon, which is more likely to occur, can be prevented, and the conventional problem can be solved efficiently.

[Means for Solving the Problems] In the present invention, a mirror is made of a metal plate, and a rear surface of the mirror is provided with a surface heating element having a performance of uniformly generating heat. That is, a sheet heating element covered with a fire-resistant insulating outer cover is attached to the whole or part of the back of a metal mirror made of a stainless steel plate or a copper plate, and heat conduction to the mounting wall is prevented outside. The planar heating element is made of a conductive resin mixed with conductive particles such as carbon and graphite, and made of a conductive resin that generates heat while maintaining a substantially constant set temperature when energized. It is a cloud mirror.

[Effect] The present invention is a metal mirror made of a stainless steel plate or a copper plate, so that it is easy to increase the size, and even if the size is increased, there is no breakage or damage. Work becomes easy, and it is extremely robust against shocks and vibrations after mounting. In addition, even if a part is curved due to an impact or the like, it can be corrected, and the clouding phenomenon due to corrosion or the like can be mirror-finished as it was by precision polishing, so that the durability is permanent. These properties are not possible with glass or plastic plates.

In the present invention, a sheet heating element is mounted on the back surface of the metal mirror 1 to prevent the metal mirror 1 from fogging by heating, and the sheet heating element is made of a conductive resin. This conductive resin is composed of a thin and light sheet made of conductive particles such as carbon and graphite and the resin that wraps the conductive particles, and can be set to the optimal heat generation temperature for the anti-fog of the metal mirror by the mixing ratio of the conductive particles. It is. The conductive particles are blended in such a ratio that they are connected to each other to connect the electric circuit.If the temperature of the sheet heating element rises due to accidental heat generation or external heating, the resin expands and the electric circuit is cut off at various places. The effect of reducing the resistance is that the electric passage is obstructed and the electric resistance increases. Therefore, when the temperature rises, the resistance rises and reduces the current, thereby suppressing the rise in the heat generation temperature. Conversely, when the temperature falls, the current rises, the heat generation temperature rises, and the balance between heat generation and heat dissipation becomes a planar heating element. It has the property of retaining itself. Due to this self-temperature control action, the surface heating element has a uniform surface temperature, and even large-sized metal mirrors can efficiently prevent the fogging phenomenon of the mirror surface. The heat generation temperature can be determined by the blending ratio of the conductive particles, and the sheet heating element 3 itself automatically maintains the predetermined set temperature. Therefore, there is no need for a conventional automatic temperature control device that keeps constant heating by interrupting the current in order to prevent the fogging phenomenon.

Further, since the sheet heating element 3 on the back of the metal mirror 1 is mounted with the insulating outer cover 2 covered, even if the insulating property of the sheet heating element 3 is reduced, the metal mirror 1 is not used. Electric leakage is prevented, and safety is ensured. After installation, the heat insulating plate 4 is attached to the outer surface of the planar heating element 3 on the mounting wall side. Even if the temperature decreases, the heating of the mounting wall surface can be prevented, and the heat loss of the planar heating element 3 can be prevented.

Embodiment An embodiment shown in FIG. 1 will be described. The metal mirror 1 is made of a stainless steel plate, a copper plate, or the like, and the back of the metal mirror 1 is coated with a conductive resin by a fire-resistant insulating outer cover 2 to heat the metal mirror 1 and prevent fogging. The planar heating element 3 configured as described above is mounted. The conductive resin is mixed with conductive particles such as carbon and graphite, and the mixing ratio is selected so as to keep the set temperature substantially constant by applying power from the power supply line 5. For example, when the temperature of the sheet heating element 3 is set to 60 ° C., when the power is supplied from the power supply line 5, the heat generation temperature rises sharply before the set temperature of 60 ° C. During this time, the resistance at each temperature increases. Power is consumed according to the value. As the set temperature approaches 60 ° C, the electric resistance increases rapidly and the weather becomes almost constant, and at the same time, the temperature also stabilizes and power consumption is suppressed. When the temperature of the sheet heating element 3 falls below the set value due to heat radiation, the electric resistance value also drops, power consumption increases, and the heating temperature rises to maintain a stable set temperature. A heat insulating plate 4 is attached to the outside of the planar heating element 3 to prevent the wall surface from being heated after the attachment. The heat insulating plate 4 may be mounted and placed in advance or may be mounted at the time of mounting, depending on the mounting location.

In FIG. 2, a sheet heating element 3 covered with an insulating outer cover 2 is attached to a part of the rear surface of the metal mirror 1, and a heat insulating plate 4 is attached outside the heating element 3 to reduce the cost. This is an example. In this case, it is advantageous in terms of thermal efficiency to arrange the mounting position of the surface heating element 3 below the metal mirror 1 as shown in the figure. In addition, the same effect can be obtained by dividing the sheet heating element 3 and attaching the sheet heating element 3 to a plurality of points.

[Effects of the Invention] The present invention is a metal mirror made of a metal plate that does not break or break. Therefore, even if the size of the mirror is increased, the workability at the time of manufacturing, transporting, storing, and mounting is improved, and the conventional technology is improved. This has the effect of significantly reducing costs compared to large mirrors, and has the effect of improving durability, improving safety against impact and vibration after installation, and facilitating repairs. In addition, it is possible to prevent the mirror surface from being fogged by heating the sheet-like heating element attached to the rear surface so as to maintain a substantially constant set temperature. Since the sheet heating element is covered with the insulating outer cover, leakage to the metal mirror is prevented. In addition, by installing a heat insulating plate between the planar heating element and the mounting wall, heating to the wall can be prevented and safety can be ensured. It protects the heating element and makes it easy to mount it on the wall.

[0012] The planar heating element has a characteristic that when the temperature of the planar heating element itself rises, the power is suppressed and the temperature is controlled to a stable set temperature when the temperature of the planar heating element itself rises. A conventional automatic temperature control device using a temperature sensor or the like can be omitted. Therefore, safety can be maintained and control can be simplified, and since electric energy is used efficiently, there is an energy saving effect, and there is also an economic efficiency that can reduce product costs.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, in which a plate-shaped surface heating element is mounted on the entire rear surface of a metal mirror.

FIG. 2 is a perspective view of another embodiment of the present invention, in which a plate-shaped surface heating element is mounted on a part of the rear surface of a metal mirror.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal mirror 2 Insulating outer cover 3 Planar heating element 4 Mounting insulation plate 5 Power supply line

Claims (1)

[Utility model registration claims] 1. A sheet-like heating element 3 covered with a fire-resistant insulating outer cover 2 is attached to the back of a metal mirror 1 made of a stainless steel plate or a copper plate, and a heat insulating plate 4 is attached to the outside thereof. The large-sized anti-fog metal mirror is characterized in that the sheet heating element 3 is made of a conductive resin mixed with conductive particles such as carbon and graphite and generating heat while maintaining a substantially constant set temperature by energization. .