JPH06144164A - Car mirror with anti-fog function - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] To provide a mirror for automobiles that has an anti-fog function in the early morning when it is cold and in high humidity days. [Structure] The gel heat storage agent 3 is installed on the back surface of the mirror plate 1,
Next, the heat insulating material 4 is disposed in close contact with the heat insulating material 4, and the mirror, the gel heat storage agent 3, and the heat insulating material 4 are hermetically integrated using the container 2 to form an automobile mirror.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fog-preventing function of an automobile side mirror which is likely to occur in cold weather.

[0002]

2. Description of the Related Art An automobile side mirror is an extremely important safety device for observing movements of a vehicle occupant or the like from the rear, installed one each on the left and right in a place easier to see than a driver's seat of a car. When parked, the mirror surface may become cloudy and lose its function. The mirror itself is not large, and the reflection function can be restored if a person goes outside the car and removes the fog with a cloth etc., but it is too late to notice after running the car. In addition, the danger of road traffic occurs for both myself and others. Therefore, the improvement is strongly desired. The main causes of clouding of the side mirrors when a car is parked outdoors during cold weather are as follows.
That is, the radiation cooling causes the temperature of the mirror surface to become lower than the dew point of the surrounding air, and water droplets are condensed on the mirror surface or ice particles are attached. Therefore, in order to prevent fogging of the side mirrors, it is sufficient to prevent the mirror surface from having a temperature lower than that of the surrounding air. Japanese Patent Laid-Open No. 01-301428 proposes an integrated mirror in which a heating element made of a heat-generating resin is provided on the entire back surface of the mirror, and the mirror and the heating element are covered by injection molding with a non-heat-generating resin. According to Utility Model No. 02-4201, a method is proposed in which an ultrasonic vibrator is attached to the back surface of the mirror body, and the water attached to the surface of the mirror body is removed by heat generated by vibration in the thickness direction. In addition, as a proposal to prevent the fogging of the side mirrors, in the utility model development 01-150150, a part of the vehicle interior air conditioning system is guided by a hose or piping to blow air at a necessary temperature, In the new proposal 62-139772,
It is proposed that a combustion heater be installed in the space formed behind the mirror of the body to immediately clear up the fogging of the mirror without waiting for the engine to warm up. As described above, the conventionally proposed technique blows hot air onto the mirror. The heating element or combustion heats the mirror. Energy generated by an oscillating element such as ultrasonic waves is used. Although it seems that the anti-fogging effect is sufficient in all cases, the new problems that have arisen are that new equipment must be added or that the vehicle mechanism becomes more complicated. Is also costly.

[0003]

The main cause of fog on automobile side mirrors is that when the temperature of the mirror surface drops below the ambient temperature due to radiative cooling and becomes lower than the dew point of the surrounding air, the airborne mirror surface is exposed to air. Since water is condensed, it is to provide an anti-fog function for the side mirrors of automobiles at low cost and without adding new equipment.

[0004]

DISCLOSURE OF THE INVENTION The present invention is intended to solve these problems, and a gel heat storage agent is installed on the back surface of a mirror in a heat conductive manner, and then a heat insulating material is provided. Placed in close contact with each other, the mirror, the heat storage agent, and the heat insulating material are hermetically integrated using a container, or heat conduction is possible to the back surface of the mirror.
This can be achieved by installing a container containing a heat storage agent with a small loss of moisture permeability, and then placing a heat insulating material in close contact with the container. Although the heat storage part is the main part of this equipment, the heat storage agent may be one that utilizes phase transition or one that accumulates sensible heat, but a gel material is used as a property. That is, if it is a gel, there is no fear of liquid leakage, and it also shows a preferable tendency against a change in gravity due to rapid acceleration or deceleration. In addition, it is possible to mold it to a desired curvature, and it is also possible to integrate this molded product with the side mirror by hand. Further, for the purpose of manufacturing cost reduction, it is possible to make a container having a mirror as a bottom surface and gel the liquid heat storage agent therein. As a container having a small loss of moisture permeability, for example, a three-layer film in which front and back surfaces of an aluminum foil are laminated with a polyethylene film is used.
Also in this case, it is preferable to use a gel heat storage agent because of concern about liquid leakage, but a liquid heat storage agent may be used depending on the strength of the film and the like. As a heat storage agent, -20
It is preferable that the amount of heat storage per volume is large over a wide temperature range of about 40 ° C. to 40 ° C. and that it does not freeze at the lowest possible temperature. For example, an aqueous solution of ethylene glycol, propylene glycol, diethylene glycol or the like is used. The gelation of the heat storage agent may be performed by any method. For example, using an appropriate amount of commercially available super absorbent resin,
For example, by gelling or by adding commercially available polyvinyl alcohol in an amount of 5 to 10% by weight and dissolving it at a high temperature, and then freezing, or in other cases, a water-soluble monomer such as hydroxyethyl methacrylate is added with ethylene glycol dimethacrylate or the like. There is a method in which a bifunctional monomer is added to carry out a polymerization reaction, but any method may be used for gelation. Also, it has closed cells as the heat insulating material,
Moreover, a material having a role of buffer material, such as urethane home, is used.

[0005]

【Example】

Example 1 FIG. 1 is a cross-sectional view of an automobile side mirror of the present invention.
In FIG. 1, reference numeral 1 is a metallic mirror plate having a diameter of 100 mm and having a mirror surface 1A having an appropriate curvature, which is adhered to the container of 2. 50 g of commercially available high water resin powder is placed in this container.
After the addition, 500 ml of a 50% aqueous solution of propylene glycol was injected to form a gel, and the heat storage agent 3 was formed. A thermal buffer material 7 having a thickness of 1 mm was set in close contact with the back surface B of the mirror surface. Next, select polyurethane foam as the heat insulating material 4 to prevent the gel heat storage agent from moving.
After putting on the back cover 5 and then the fastening part 6
Airtight integrated sealing was performed by. Table 1 shows the results of a comparative test in which the automobile side mirror A of the present invention was attached to one side of a side mirror of a 1300 cc ordinary passenger car and the remaining ordinary mirror B was compared in the winter season. The measurement is 6 every morning.
It is measured at 30 minutes.

[0006]

As is clear from the results shown in Table 1, the side mirror surface of the present invention shows a temperature higher than the conventional side mirror surface temperature and also higher than the ambient air temperature over the entire observation period. It should be noted that the side mirror of the present invention stably provided good results even when the side mirror fogging was visually observed.

[0007]

The side mirror for an automobile according to the present invention comprises:
Since it has an anti-fog function even in the early morning when it is cold or on a humid day, it is extremely effective in confirming the rear safety of the vehicle, and there is no failure because it does not use a complicated mechanism. On the other hand, in terms of production, the productivity is high by using a gel material.

[Brief description of drawings]

FIG. 1 shows an example of an embodiment of the present invention. It is a vertical cross-sectional view of an automobile side mirror.

[Explanation of symbols]

 1A Mirror surface 1B Mirror surface back 1 Mirror surface plate 2 Container 3 Gel heat storage agent 4 Heat insulating material 5 Back cover 6 Fastening part 7 Thermal shock absorbing material

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[Procedure amendment]

[Submission date] November 24, 1992

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

2. Description of the Related Art One side mirror for a vehicle is installed on the left and right in a place that is easier to see than the driver's seat of a car, and is an extremely important safety for observing the movement of a car or a person from behind.
It is an instrument , but when it is parked in cold weather, the mirror surface may fog and lose its function. The mirror itself is
It is not a big one, but if a person goes outside the car and removes the fog with a cloth etc., the reflex function can be restored, but it is too late to notice after starting the car, so it is not possible The danger of Therefore, the improvement is strongly desired. The main causes of clouding of the side mirrors when a car is parked outdoors during cold weather are as follows. That is, the radiative cooling, mirror becomes a temperature lower than the dew point of the ambient air, or water droplets condensed on the mirror surface, or is that the ice grains are adhered. Therefore, in order to prevent fogging of the side mirrors, it is sufficient to prevent the mirror surface from having a temperature lower than that of the surrounding air. According to Japanese Patent Laid-Open No. 01-301428,
There has been proposed an integrated mirror in which a heating element made of a heating resin is provided on the entire back surface of the mirror, and the mirror and the heating element are covered by injection molding with a non-heating resin. According to Japanese Utility Model Laid- Open No. 02-4201, there is proposed a method in which an ultrasonic transducer is attached to the back surface of the mirror main body and the water adhering to the surface of the mirror main body is removed by heat generated by vibration in the thickness direction. In addition, as a thing proposed as an antifog for side mirrors,
In the case of the actual open air 01-150150, a part of the vehicle interior air conditioning system is guided by a hose or piping to blow air of a required temperature, or in the actual open air 62-139772, the space formed on the back of the mirror of the body. In addition, by installing a combustion heater, etc., without waiting for the engine to warm up,
We propose to clear up the cloudiness of the mirror as soon as possible. As described above, the conventionally proposed technique blows hot air onto the mirror. The heating element or combustion heats the mirror. Energy generated by an oscillating element such as ultrasonic waves is used. Is classified into, but both think that the anti-fogging effect is sufficient, as the challenges that newly generated, Toka that must be set with the new equipment, Toka possible to more complex the car of the mechanism In addition, it is also costly.

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction item name] "Simple explanation of drawing" column

[Correction method] Delete

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuyuki Nagasaki 2490-5 Higashikataue, Bizen City, Okayama Prefecture (72) Inventor Yasuo Nanjo 400-8 Fukui, Kurashiki City, Okayama Prefecture Katsumi Tamura 590 Takao, Tsuyama City, Okayama Prefecture -1

Claims (4)

[Claims] 1. A gel heat storage agent is installed on the back surface of the mirror so as to be able to conduct heat, and then a heat insulating material is placed in close contact therewith, and the mirror, the heat storage material and the heat insulating material are hermetically integrated using a container. An automotive mirror with an anti-fog function, which is characterized in that 2. A mirror for an automobile with an anti-fog function, characterized in that a container containing a heat storage agent having a low moisture permeability loss is installed on the back surface of the mirror so as to be able to conduct heat, and then a heat insulating material is closely arranged. 3. A mirror for an automobile with an anti-fog function according to claim 1, wherein a heat buffering material is provided between the back surface of the mirror and the gel heat storage agent. 4. The mirror for an automobile with an anti-fog function according to claim 2, wherein a heat buffer material is provided between the back surface of the mirror and the gel heat storage agent.