JP2898519B2 - Anti-fog mirror - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PTC (Positi) for heating a mirror in a high-humidity room such as a bathroom so that the mirror is not fogged.
The present invention relates to an anti-fog mirror provided with a constant temperature heater having ve Temperature Coefficient characteristics, for example, a heater made of a barium titanate-based porcelain semiconductor.

[0002]

2. Description of the Related Art Conventionally, in a room with high humidity such as a bathroom, an anti-fog mirror in which a film having an anti-fogging effect is adhered to the surface of the mirror or a paint having an anti-fogging effect is applied has been used. Have been.

However, the anti-fog mirror having such a configuration has problems that the film and the paint are easily peeled off due to humidity and temperature change, and the anti-fog function is easily deteriorated with aging.

To solve such a problem, Japanese Utility Model Laid-Open Publication No. Sho 60-155371 discloses, for example,
A sheet-like heating element, for example, a film-like heating element obtained by applying a heating coating containing carbon or metal to the surface of a heat-resistant polymer film is attached to the back of the mirror, and electricity is supplied to the heating element so that the surface of the mirror is exposed. There is disclosed an anti-fog mirror adapted to heat the mirror.

Further, a sheathed heater, for example, a string-shaped heating element formed by coating a metal wire with a heat-resistant polymer is attached to the back surface of the mirror, and the heating element is energized to heat the surface of the mirror. Cloud mirrors are also known.

However, in both of the above configurations, a temperature control circuit is required to maintain the heat generation temperature at a predetermined temperature, and an overheat prevention circuit is also required to ensure safety. Therefore, the size of the anti-fog mirror increases.
In addition, in the former anti-fog mirror using a film-shaped heating element, if an air layer is formed between the film-shaped heating elements when they are attached to the back surface of the mirror, the film-shaped heating element in the raised portion when energized. Since there is no place for escaping the heat generated in the above, there is a possibility that a local overheating may occur and a fire may occur. On the other hand, in the latter case of the anti-fog mirror using a string-shaped heating element, it is difficult to adhere the string-shaped heating element to the mirror when attaching it to the back surface of the mirror. Is low.

In order to solve the above-mentioned inconveniences, the applicant of the present application has previously disclosed in Japanese Utility Model Application No. Hei 4-30617 a heat transfer plate provided in close contact with the back of a mirror. There has been proposed an anti-fog mirror in which a flat heating element made of a positive temperature coefficient thermistor is provided on the back side of the plate, and a plurality of heaters whose periphery is covered with an electrically insulating coating member are provided.

The positive temperature coefficient thermistor has a positive temperature coefficient (Positi
ve Temperature Coefficient), which is made of a ceramic semiconductor made of barium titanate or the like as a main material, has low resistance from room temperature to Curie temperature Tc (rapid change temperature), but sharply exceeds Curie temperature Tc. This is a thermosensitive element having a characteristic of increasing the resistance value. Due to this characteristic, when a heating element is applied with a voltage,
Since the temperature is low, the resistance value is small and a large current flows. As a result, the temperature rises sharply. On the other hand, when the temperature exceeds the Curie temperature Tc, the resistance value sharply increases. Does not rise and a constant temperature is stably maintained. That is, the heating element including the positive temperature coefficient thermistor can have a self-temperature control function.

Therefore, in the above configuration, the temperature control circuit and the overheat prevention circuit can be omitted, the size of the anti-fog mirror can be reduced, and the safety can be improved without fear of ignition due to local overheating. . In addition, since the entire heater except for the power supply line is covered with the electrically insulating covering member, the heater is excellent in waterproofness and insulating properties, and thus the safety is higher.
Further, since the heating element has a simple plate-like shape and a plurality of heaters made of the heating element are provided on a heat transfer plate provided on the back surface of the mirror, it is possible to reduce the thickness and weight. In addition, the heat generated by the heating element can be efficiently transmitted to the mirror.

[0010]

However, in the structure proposed in the above-mentioned Japanese Patent Application No. Hei 4-30617, as will be more clearly understood with reference to FIG. On the back side of the device 1, lead wires 9, which are power supply lines for the heater 3, are exposed together with the heat transfer plate 2. In the case of such a configuration, there is no particular problem when attaching to a unit bath or the like in a factory, but when wholesale is carried out to a retail store or the like and installed on a retail store side, for example, in a bathroom of a general household,
There is a possibility that the exposed lead wires 9, 9 may be scratched or broken at the time of mounting, causing problems such as difficulty in handling at the time of mounting.

In addition, when it is installed in a bathroom or the like of a general household, if there is a large space outside the mounting wall such as a bathroom wall,
The heat that escapes from the heat transfer plate 2 to the back side increases,
Problems such as an increase in power consumption also occur.

Further, when the heat transfer plate 2 is made of a metal such as aluminum, even if the heat transfer plate 2 is covered with a protective resin, the heat transfer plate 2 is exposed on the back surface of the mirror 1. If the part is peeled off, it may be corroded by chemicals such as detergent for bathtub washing.

The present invention has been made in view of the above-mentioned problems, and has as its object the purpose of the present invention is to be lightweight and thin and excellent in safety.
Furthermore, handling at the time of installation is easy, excellent in chemical resistance,
Another object of the present invention is to provide a low power consumption anti-fog mirror.

[0014]

According to a first aspect of the present invention, there is provided an anti-fog mirror according to the first aspect of the present invention, wherein a heat transfer plate is provided in close contact with the rear surface of the mirror. On the back side, a flat heating element made of a positive temperature coefficient thermistor is provided inside, and a plurality of heaters whose surroundings are covered with an electrically insulating coating member are provided. Each heater is connected to a junk through a lead wire.
And a resin cover for covering the entire heat transfer plate with the heater and the lead wires on the back surface of the mirror.

According to a second aspect of the present invention, there is provided an anti-fog mirror according to the first aspect, wherein the cover is provided so as not to contact the heat transfer plate and each heater. It is characterized by being provided.

[0016]

According to the first aspect of the present invention, since the resin cover is provided on the back of the mirror to cover the entire heat transfer plate with the heater and the lead wires , the power supply line connected to the heater is also covered by the cover. It will be covered and not exposed. Therefore,
Also at the retail store side, the exposed electric wires are not scratched or broken at the time of installation, and the handling becomes easy. Also, by covering the entire heat transfer plate with a cover,
Since the insulation effect is provided, even if there is a large space outside the mounting wall such as a bathroom wall, the escape of heat to the back side is suppressed, and the increase in power consumption due to wasteful use of power is suppressed. it can. Further, since the adhesion of chemicals to the heat transfer plate is prevented, corrosion of the heat transfer plate is prevented.

Further, since the heater has a heating element made of a positive temperature coefficient thermistor inside, the temperature control circuit and the overheat prevention circuit can be omitted, and the size of the anti-fog mirror can be reduced. Safety is improved without fear of ignition. In addition, since the entire heater except for the power supply line is covered with the electrically insulating covering member, the heater is excellent in waterproofness and insulating properties, and thus the safety is higher. In addition, the above-described heating element has a flat plate shape, and the heater including the heating element is
Connected to the junction member via the lead wire
These heaters are installed on the heat transfer plate on the back of the mirror.
Because of the simple configuration provided , the thickness and weight can be reduced, and the heat generated by the heating element can be efficiently transmitted to the mirror.

According to the configuration of claim 2, the cover is
Since the heat transfer plate and each heater are provided in a non-contact manner,
In addition to the effect of the configuration of claim 1, an air layer that can be a heat insulating layer is interposed between the heat transfer plate and the cover, so that a further heat insulating effect can be expected with this air layer.
The increase in power consumption can be suppressed more effectively.

Further, by making the cover not in contact with the heat transfer plate or the heater, a resin having not so high heat resistance can be used as the material of the cover, thereby widening the selection range of the material of the cover. Can be.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. The anti-fog mirror according to the present embodiment is shown in FIG.
As shown in FIG. 1A, a heat transfer plate 2 and a cover 20 are provided on a back surface 1a of a mirror 1 in this order.

As shown in FIG. 2, the heat transfer plate 2 is provided at a predetermined position on the back surface 1a of the rectangular mirror 1, for example, at a position where a face is just photographed, by a total of six heat transfer plate stoppers 7. Mounted closely. The heat transfer plate 2 is made of a metal plate having excellent heat conductivity, for example, an aluminum plate subjected to alumite processing, and is formed in a rectangular shape smaller than the mirror 1.

On the back surface 2a of the heat transfer plate 2, a total of eight heaters 3 and two upper and lower junction members 5.
6 are provided at predetermined positions on the back surface 2a.

The above-mentioned heaters 3...
The upper and lower junction members 5 are connected to each other by a pair of lead wires 9 serving as power supply lines provided for each heater 3.
6 are connected to each other. The upper and lower junction members 5 and 6 are connected to each other in parallel by a power supply cord 13, and each heater 3 is electrically connected to an external power supply via the power supply cord 13.

The upper and lower junction members 5 and 6 are attached to the heat transfer plate 2 with bolts and nuts (not shown). The upper and lower junction members 5
6 may be attached to the heat transfer plate 2 with an adhesive.

As shown in FIGS. 3 and 4, each of the heaters 3 includes a heating element 4, metal terminals 8.8, lead wires 9.9, and an insulating case 10 as an electrically insulating covering member. .

The heating element 4 has a positive temperature coefficient (Positive Tempe
(Characteristic Coefficient), for example, a positive temperature coefficient thermistor composed of a ceramic semiconductor mainly made of barium titanate, and has a low resistance from room temperature to the Curie temperature Tc (rapid temperature change). However, it has a characteristic that the resistance value sharply increases when the temperature exceeds the Curie temperature Tc. Due to this characteristic, the heating element 4 has a self-temperature control function as described above. The heating element 4 can arbitrarily set the Curie temperature Tc within a range of about 30 to 270 ° C. by adjusting the material composition. For example, if part of barium titanate is replaced by Pb, the Curie temperature Tc can be reduced to about 1 of the normal value.
It can be as high as 20 ° C. Further, if part of barium titanate is replaced with Sr, the Curie temperature Tc can be lowered. Therefore, in the heating element 4, the Curie temperature Tc can be set in consideration of safety and power saving, and the surface temperature of the mirror 1 effective for preventing fogging can be realized.

The heating element 4 has a flat cylindrical shape,
As shown in FIG. 4, electrodes 4a are formed on the upper and lower surfaces by applying, for example, a silver paint.

The metal terminal 8 has a circular plate shape having a diameter substantially equal to the outer diameter of the heating element 4, and has a hole at the center thereof substantially equal to the inner diameter of the heating element 4. Each metal terminal 8 is provided with a power supply portion 8a for connecting a lead wire 9. These power supply portions 8a are parallel to each other, are shifted from each other in the facing direction, and extend in the introduction direction of the corresponding lead wires 9,9.

The electrical connection between the metal terminals 8.8 and the heating element 4 is performed by connecting the electrode 4a of the heating element 4 and the metal terminal 8 with a conductive adhesive of, for example, an epoxy / silver mixture (for example, a DEM manufactured by Degusa Corporation).
ETRON 6290-0343). The electrical connection between the power supply portions 8a and the lead wires 9 is made by, for example, soldering the corresponding lead wires 9 to the opposing surfaces of the power supply portions 8a. In this case, one lead wire 9 is connected to one metal terminal 8 and the first metal terminal 8 by the positional relationship between the power supply portions 8a.
Position, and the other lead wire 9 is connected to the other metal terminal 8.
Is connected at a second position, and the first position is connected to the electrode 4a.
And the second position is disposed on the other side of the plane, which is a boundary.
Thus, the lead wires 9 do not prevent the heating element 4 from being further thinned.

The insulating case 10 includes an insulating case lower part 10a as a covering base and an insulating case upper part 10b. The insulating case 10 covers and seals the heating element 4 and the metal terminals 8.8, and has a fixing hole 3a used for screwing the heater 3 to the heat transfer plate 2 in the center. Have been. Incidentally, a female screw groove may be formed in the fixing hole 3a as necessary. Further, the insulating case 10 is provided with a terminal portion of the lead wire 9.9 on the metal terminal 8 side so that a mechanical load is not applied to a soldered portion between the lead wire 9 and the power supply portion 8a of the metal terminal 8 to cause disconnection. Is also covered.

The above-mentioned insulating case 10 accommodates the heating element 4 and the like in an insulating case lower part 10a formed in advance by injection molding or the like, and is installed in an injection molding die. Is formed integrally with the insulating case lower part 10a and the insulating case upper part 10b. Thus, the heating element 4 and the like are sealed and fixed inside the insulating case 10.

The insulating case 10 has a small heat shrinkage, is excellent in thermal conductivity and mechanical strength, has heat resistance enough to withstand the heat generation temperature of the heating element 4, waterproofness not passing moisture such as water vapor, and air. Having airtightness that does not pass through the inside,
In addition, it is necessary that the adhesion between the lead wires 9 and the coating material is good, and for example, the lead wires 9 are made of a polymer alloy made of nylon, polypropylene and glass fiber.

The mounting of the insulating case 10 on the back surface 2a of the heat transfer plate 2, that is, the mounting of the heater 3 on the back surface 2a, is performed by using a fixing screw 11 and a nut (not shown) in the fixing hole 3a at the center. It is performed by being screwed.
The heater 3 may be attached to the heat transfer plate 2 with an adhesive.

The cover 20 for covering the heat transfer plate 2 is provided as shown in FIG.
As shown in FIGS. 5A and 5B and FIGS. 5A to 5C, it is formed in a rectangular shallow lid shape smaller than the mirror 1 and larger than the heat transfer plate 2. A sealing groove 20a for filling a sealing agent used when the cover 20 is fixed to the back surface 1a of the mirror 1 with a sealing agent is provided almost all around the outer peripheral portion of the cover 20, and the inside of the sealing groove 20a is provided. Is provided with a flat portion 20b which is in close contact with the back surface 1a of the mirror 1.

Inside the flat portion 20b of the cover 20, a portion facing the heat transfer plate 2 when the cover 20 is attached to the back surface 1a of the mirror 1 substantially matches the shape of the heat transfer plate 2, and A slightly larger recess 20c is formed, and the heat transfer plate 2 is accommodated in the recess 20c. The depth of the recess 20c (the distance in the thickness direction from the flat portion 20b) is set larger than the thickness of the heat transfer plate 2 so that the heat transfer plate 2 does not contact the inner surface of the cover 20. Thus, a space is provided between the heat transfer plate 2 and the cover 20, and an air layer is interposed therebetween, so that the air layer further improves the heat insulating effect.

In the center of the cover 20, the heaters 3... And the recesses 20d for the upper and lower junction members 5 and 6, which are continuous with the recesses 20c for the heat transfer plate, are formed so as to conform to their shapes. The recesses 20c are formed deeper than the recesses 20c, and the heaters 3,..., The upper and lower junction members 5 and 6, and the power cord 13 are accommodated in the recesses 20d. The depth of the recess 20 d is also set such that the housing members such as the heaters 3 do not contact the inner surface of the cover 20. This, as above,
Since the air layer is interposed, the heat insulation effect is further improved. Further, when the heaters 3 are energized, the fixing screws 11 for fixing the heaters 3 to the heat transfer plate 2 are also provided.
Is raised to about 70 ° C., but the fixing screw 11 and the cover 20 do not come into contact with each other, so that the deterioration of the cover 20 can be prevented from being promoted.

The heat transfer plate stoppers 7 attached to the mirror 1 also have heat transfer plate stoppers 7.
Are formed for accommodating. Also in this case, the depth of the concave portion 20e is set to be deeper than the thickness of the heat transfer plate stopper 7 itself.

An opening 20f for taking out a power cord is formed in the center of the lower end of the cover 20. The opening 20f also serves as an outlet for the power cord 13, and also serves to discharge dew condensation water, ingress water, and the like in the cover 20. Thereby, rust generation of the heat transfer plate 2 and the like is suppressed.

The material of the cover 20 is water-resistant,
Those having heat resistance, chemical resistance, and heat insulation are desirable. For example, acrylonitrile-butadiene-styrene resin (A
BS resin), polypropylene, polyethylene terephthalate and the like are preferably used. The cover 20 can be easily obtained by subjecting a sheet made of such a resin to heating sheet molding such as vacuum molding or match molding.

The cover 20 has a sealing groove 20a.
Back surface 1a of mirror 1 with a silicone sealant filled into the surface and double-sided tape interposed between flat portion 20 and back surface 1a.
It is fixed to. By sealing with a sealing agent in this manner, a structure having waterproofness is provided.
The cover 20 may be attached to the mirror 1 only with a sealing agent that does not use a double-sided tape, and the flat portion 20b and the back surface 1a of the mirror 1 are replaced with a double-sided tape.
It may be adhered with an appropriate adhesive.

When assembling the present anti-fog mirror in the above configuration, first, each heater 3 and the power cord 13 are connected to the upper and lower junction members 5 and 6 as shown in FIG. Then, the heater 3 is mounted at a predetermined position on the back surface 2a of the heat transfer plate 2, and then each heater 3 is mounted at a predetermined position. After that, the heat transfer plate 2 with the heater is placed on the back surface 1 a of the mirror 1.
Attach at the heat transfer plate stoppers 7 ...

Next, a silicone sealing agent is filled in the sealing groove 20a of the cover 20, and the backing paper of the double-sided tape partially adhered to the flat portion 20b is peeled off. As shown in FIG. 2 so as to cover the entire surface of the mirror 1 and affix it to the rear surface 1a of the mirror 1 to complete the anti-fog mirror. In addition, it is assumed that the entire surface of the flat portion 20b of the cover 20 is previously taped.

As described above, the anti-fog mirror is provided on the back 1 of the mirror 1.
a, a resin cover 2 covering the heat transfer plate 2 with the heater 3
Since 0 is provided, the lead wires 9 connected to each heater 3 together with the heat transfer plate 2 are also covered by the cover 20 and are not exposed. Therefore, even at the retail store side, the exposed lead wires 9 are not broken or broken at the time of attachment, and the handling becomes easy. In addition, since the cover 20 covers the entire heat transfer plate 2 to provide a heat insulating effect, even if there is a large space outside a mounting wall such as a bathroom wall, heat can escape to the rear side. It is possible to suppress power consumption increase due to useless power consumption. Moreover, in the present anti-fog mirror, between the cover 20 and the heat transfer plate 2 and the heater 3
Because of the configuration in which the air layer is formed, a further heat insulating effect is provided by this air layer, and an increase in power consumption can be suppressed more effectively. In addition, when the air layer is interposed, the cover 20 is not required to have the same heat insulation property as the structure without the air layer.
Manufacturing costs can also be reduced.

When the heaters 3 are energized, the temperature of the fixing screws 11 for fixing the heaters 3 to the heat transfer plate 2 becomes 7
Although the temperature is raised to about 0 ° C., by providing the cover 20 in a non-contact manner with each heater 3, the deterioration can be prevented from being promoted, and the heat resistance is not required as high as the structure without the air layer. This also widens the range of choices for selecting the material of the cover 20 and can reduce manufacturing costs.

In this anti-fog mirror, an air layer is interposed between the heat transfer plate 2 and the heaters 3 and the cover 20, but the air layer is not necessarily interposed. It is not necessary to perform the process, and the cover 20 may be in contact with the heat transfer plate 2 and the heater 3 by selecting a resin having sufficient heat resistance and heat insulation as the material of the cover 20.

Further, by providing the cover 20, even when the heat transfer plate 2 is made of metal or the like and a part of the protective resin formed on the surface is peeled off, chemicals or the like adhere to the heat transfer plate 2. Since there is no danger of corrosion, the corrosion of the heat transfer plate 2 can be prevented.

The resin forming the cover 20 may be any of a foamed resin and a non-foamed resin. When the cover 20 is formed of a foamed resin, a further heat insulating effect can be expected from the resin layer itself.

Further, since the present anti-fog mirror uses the heater 3 having the heating element 4 made of a positive temperature coefficient thermistor as a heating means, the temperature rises quickly after energization, and when the temperature reaches a predetermined temperature, the temperature is maintained. Will be. Therefore, the surface of the mirror 1 quickly rises to a predetermined temperature, and the effect of preventing fogging on the surface of the mirror 1 can be quickly exhibited.

The heating element 4 has a flat plate shape, and a heater comprising the heating element 4 is provided on a heat transfer plate 2 provided on the back surface of the mirror 1.
Since it has a simple structure in which a plurality of elements are provided, it is possible to reduce the thickness and weight and to efficiently conduct the heat generated by the heating element 4 to the mirror. Also, the metal terminals 8.8 connected to the upper and lower electrodes 4a of the heating element 4 are plate-shaped, and the thickness of the insulating case 10 in this portion can be made uniform and thin. 3, that is, the thickness of the anti-fog mirror can be reduced, and the efficiency of heat transfer to the mirror 1 can be improved.

In the anti-fog mirror described above, since the lead wires 9 are connected to the metal terminals 8.8 on the opposite sides of the power supply portions 8a, 8a, respectively, the outer surfaces of the metal terminals 8.8 are connected. No unevenness occurs due to the connection of the lead wires 9. Therefore, it is not necessary to provide the insulating case 10 with a thickness for absorbing the unevenness, and the insulating case 10, that is, the heater 3, can be formed thinner. Thereby, the anti-fog mirror can be made even thinner, and the heat generated by the heating element 4 can be more efficiently conducted to the heat transfer plate 2, that is, the mirror 1.

The shapes of the heating element 4 and the heater 3 are not limited to the above-mentioned flat cylindrical shape, but may be various shapes such as a square plate having a fixing hole for screwing. .

Further, the positions and the number of fixing holes formed in the heating element 4 and the heater 3 and the mounting positions thereof are not limited to those in the above embodiment, but can be changed according to the size of the heater. It is.

The shape of the heat transfer plate 2 is not limited to the above-described rectangle, but may be various shapes such as a circle and a rhombus. Also, the size of the heat transfer plate 2 is
It can be variously changed according to the size of.

Similarly, the number of junction members is not limited to two, that is, the upper and lower junction members 5 and 6, and can be selected as appropriate according to the area of the heat transfer plate 2.

[0055]

As described above, in the anti-fog mirror according to the first aspect of the present invention, the heat transfer plate is provided in close contact with the rear surface of the mirror, and the rear surface of the heat transfer plate comprises a positive temperature coefficient thermistor. comprising a plate-like heating element therein, is provided with a plurality heater coated around in an electric insulating cover member, each heater Lee
Connected to the junction member via a wire ,
A resin cover that covers the entire heat transfer plate with the heater and the lead wires is provided on the back surface of the mirror.

According to this, since the resin cover which covers the entire heat transfer plate with the heater and the lead wire is provided on the back surface of the mirror, the power supply line connected to the heater is also covered with the cover. Not exposed. Therefore, even on the side of the retail store, the exposed power supply line is not scratched or broken at the time of installation, and the handling becomes easy. Also, by covering the entire heat transfer plate with a cover,
Since the insulation effect is provided, even if there is a large space outside the mounting wall such as a bathroom wall, the escape of heat to the back side is suppressed, and the increase in power consumption due to wasteful use of power is suppressed. it can. Further, since the adhesion of chemicals to the heat transfer plate is prevented, corrosion of the heat transfer plate is prevented.

Further, since the heater has a heating element made of a positive temperature coefficient thermistor inside, the temperature control circuit and the overheating prevention circuit can be omitted, the size of the anti-fog mirror can be reduced, and the local overheating can be prevented. Safety is improved without fear of ignition. In addition, since the entire heater except for the power supply line is covered with the electrically insulating covering member, the heater is excellent in waterproofness and insulating properties, and thus the safety is higher. In addition, the above-described heating element has a flat plate shape, and the heater including the heating element is
Connected to the junction member via the lead wire
These heaters are installed on the heat transfer plate on the back of the mirror.
Because of the simple configuration provided , the thickness and weight can be reduced, and the heat generated by the heating element can be efficiently transmitted to the mirror.

As a result, it is possible to obtain an anti-fog mirror which is lightweight, thin, excellent in safety, easy to handle at the time of mounting, excellent in chemical resistance, and low in power consumption.

As described above, the anti-fog mirror according to claim 2 of the present invention is the anti-fog mirror according to claim 1, wherein the cover is provided in non-contact with the heat transfer plate and each heater. Configuration.

According to the configuration of claim 2, the cover is
Since the heat transfer plate and each heater are provided in a non-contact manner,
In addition to the effect of the configuration of claim 1, since an air layer which can be a heat insulating layer is interposed between the heat transfer plate and the cover, a further heat insulating effect can be expected with this air layer.
The increase in power consumption can be suppressed more effectively.

Further, by making the cover not in contact with the heat transfer plate or the heater, a resin having a not so high heat resistance can be used as the material of the cover, thereby widening the selection range of the material of the cover. It has the effect of being able to do so.

[Brief description of the drawings]

FIG. 1 shows an anti-fog mirror according to an embodiment of the present invention.
(A) is its rear view, (b) is A- in FIG.
FIG. 3C is a cross-sectional view taken along line A of FIG.

FIG. 2 is a rear view of the anti-fog mirror without a cover provided on the back of the anti-fog mirror.

FIG. 3 is a schematic front view showing a heater in the anti-fog mirror, partially broken away.

FIG. 4 is a sectional view of the heater.

5A and 5B show a cover provided on a back surface of the anti-fog mirror, wherein FIG. 5A is a rear view thereof, FIG. 5B is a cross-sectional view taken along line CC in FIG. Is D in FIG.
FIG. 4 is a sectional view taken along line -D.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mirror 2 Heat transfer plate 3 Heater 4 Heating element 4a Electrode 5 Upper junction member 6 Lower junction member 7 Heat transfer plate stopper 8 Metal terminal 9 Lead wire (power supply line) 10 Insulation case (electrically insulating covering member) 11 Fixing screw 20 Cover

Continuation of the front page (56) References JP-A-5-7170 (JP, U) JP-A 48-65497 (JP, U) JP-A 5-43956 (JP, U) JP-A 62-120702 (JP) , U) (58) Fields investigated (Int. Cl. ⁶ , DB name) A47G 1/00

Claims (2)

(57) [Claims] A heat transfer plate is provided in close contact with the back surface of a mirror, and a flat heating element made of a positive temperature coefficient thermistor is provided on the back surface of the heat transfer plate. provided plurality is coated heater Te, each heater Li
The heat transfer plate is connected to the junction member via a lead wire, and the entire heat transfer plate is
An anti-fog mirror characterized by being provided with a resin cover that covers the entire wire . 2. The anti-fog mirror according to claim 1, wherein the cover is provided in non-contact with the heat transfer plate and each heater.