JP2607552Y2 - Heated mirror - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention removes water droplets, raindrops, dew, frost, ice and the like which are preferably used for bathroom mirrors, vehicle door mirrors, etc., which are used for anti-fog or on the mirror surface. Related to mirrors with heater.

[0002]

2. Description of the Related Art When a vehicle travels during rainfall or snowfall in a cold region, water drops adhere to the rearview mirror or the like and freeze, so that the visibility behind the vehicle becomes insufficient and traveling safety is impaired. Various mirrors that can be heated to remove water droplets, ice, and the like adhering to the mirror surface by heating have been proposed for the purpose of preventing the occurrence of water droplets and ice.

For example, Japanese Utility Model Publication No. 58-28937 discloses a vehicle back in which a heat equalizing plate having a high thermal conductivity is disposed in close contact with the back surface of a head plate, and a heating element is joined to the back surface of the heat equalizing plate. A mirror is disclosed. 62-3
Japanese Patent No. 3648 discloses a mirror with a heater in which a heater on a plane is fixed to the back surface of a mirror main body, and the pattern of the heater is made denser at the periphery of the mirror than at the center. Further, Japanese Utility Model Application Laid-Open No. 4-102599 discloses a planar heating element for a mirror in which a heating region is divided into a plurality of regions by electrodes.

[0004]

In the above-mentioned mirror or the planar heating element for a mirror, a complicated heating resistor pattern or a complicated electrode pattern is required to uniformly heat the entire surface of the mirror so that a good view can be obtained. In this case, a method of fixing a separate electrothermal substrate formed with the above to the back surface of the mirror substrate has been adopted.
However, in the method using the electric heating substrate separate from the mirror substrate, a complicated heating resistor pattern has to be designed and manufactured, and there is a problem that the cost increases. Also,
Since the mirror substrate is heated by heat conduction from a separate electric heating substrate, there is a problem that thermal efficiency is poor and it takes a long time to remove water droplets and the like. Therefore, 5-13
As disclosed in Japanese Patent No. 872, there has been proposed a heater mirror in which a reflecting film and a heating resistor are formed on the surface of a mirror substrate, and an insulating overcoat layer is provided on the surface of the reflecting film and the heating resistor.

However, when the reflecting film and the heating resistor are formed on the mirror substrate surface, the thermal efficiency is improved,
There was a problem in durability and cost of the insulating overcoat layer. Further, only the central portion of the mirror easily rises in temperature, and it takes a long time to remove water droplets and the like at the end portion. Therefore, if the removal of water droplets at the end is to be carried out promptly, a large amount of power must be supplied, and not only is the efficiency inefficient, but also overheating of the center may cause a disaster such as burns due to contact etc. Become. An object of the present invention is to provide an inexpensive mirror with a heater capable of quickly removing water droplets and the like on the mirror surface by uniformly heating the entire surface of the mirror substrate with good thermal efficiency.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. A reflection film made of a heating resistor is formed on the back surface of a mirror substrate, and at least one pair of reflection films is formed on the reflection film. In a mirror with a heater in which the electrodes of the above are provided to face each other, the electrodes in contact with the reflecting film made of the heating resistor of the facing electrodes have an electrode spacing at least in the vicinity of an end of the mirror substrate at an electrode spacing in the center. The gist of the present invention is to provide a mirror with a heater, characterized in that the tip is narrower and has a narrower electrode interval and has a width .

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic rear perspective view of a mirror with a heater used in a vehicle door mirror according to one embodiment of the present invention.
FIG. Reference numeral 1 denotes a mirror substrate, which is made of a transparent material such as glass. On the back surface of the mirror substrate 1, a reflection film 2 made of a heating resistor is formed. This reflection film 2 is made of Cr, Ni, NiC
It is made of a resistor material such as r, CrSi2, and is formed by a sputtering method or a vacuum evaporation method. Further, a pair of opposing electrodes 3a and 3b are provided on the back surface of the reflection film 2 for supplying electricity to the reflection film 2 which is also the heating resistor. The opposing electrodes 3a and 3b are formed so as to be entirely in contact with a reflection film made of a heating resistor. A tip portion which is narrower than D1 and forms a narrow electrode interval is provided to have a width . The electrodes 3a and 3b can be formed by various methods. For example, a thin copper layer is formed using a copper paste, and soldering is performed thereon, or a thin nickel layer is formed by nickel plating. Further, the back surface of the mirror is coated with an insulating material 4 such as a resin for electrical insulation. Reference numeral 5 denotes a lead wire for connecting the electrode 3 to a power supply circuit (not shown).

[0008] In the heating resistor as described above, the resistance value of the central portion is generally small, and it is easy to increase at the end portion, and the central portion is easily heated. However, as described above, by forming the electrode gaps d1 and d2 at the ends to be smaller than the electrode gap D1 at the center and to make the tip having the narrower electrode gaps have a width , the end gaps are made smaller . Can be heated equally to the central part. Therefore, water drops and the like can be uniformly removed from the entire surface of the mirror without wasting electric power.

Generally, the heating resistor as described above has a small resistance value at the central portion, tends to be large at the end portions, and is easily heated at the central portion. However, as described above, by forming the electrode gaps d1 and d2 at the ends to be smaller than the electrode gap D1 at the center and to make the tip having the narrower electrode gaps have a width , the end gaps are made smaller . Can be heated equally to the central part. Therefore, water drops and the like can be uniformly removed from the entire surface of the mirror without wasting electric power.

FIG. 4 shows another embodiment. The embodiment shown in FIG. 4 is different from the embodiment shown in FIG. 1 in that the tip portions have widths at positions corresponding to the electrodes 3a and 3b in addition to the vicinity of the end portions of the mirror substrate 1.
Forming a projection having, it is provided with a narrow portion C1, C2 of electrode spacing from the electrode interval D1 of the central portion. The effect of the embodiment shown in FIG. 4 is the same as that of the embodiment shown in FIG. 1, but is particularly effective when the mirror shape is close to a long rectangle or parallelogram having long sides on which electrodes are formed.

FIG. 5 shows another embodiment. The embodiment shown in FIG. 5 has a front end portion which is entirely in contact with the reflective film 2 and has a width.
Electrode 3a, provided 3b on opposite edges of the mirror substrate 1 was further formed intermediate the width of the electrode 3a, 3b ahead of
An electrode 3c having an end is provided, the electrodes 3a and 3b are defined as positive electrodes, and the electrode 3c is defined as a negative electrode. In the relationship between the electrodes 3a and 3c, the electrode gaps d1 and d2 at the ends are set to the electrode gap D1 at the center. The electrode gaps d3 and d4 at the ends are narrower than the electrode gap D2 at the center in the relationship between the electrodes 3b and 3c. The effect of the embodiment shown in FIG. 5 is the same as that of the embodiment shown in FIG. 1, but is particularly effective when the mirror shape is close to a square or a rhombus.

FIG. 6 shows another embodiment. In the embodiment shown in FIG. 6, electrodes 3a, 3b and 3c, 3d having a mirror shape of a substantially circular or elliptical shape and having two sets of opposing widths are formed by using electrode gaps d1, d2 at the ends. , D3,
d4 is the center electrode spacing D1, D2, D3, D
It is provided to be narrower than 4. The effect of the embodiment shown in FIG. 6 is the same as the effect shown in FIG.

In the above-described embodiment, generally, the connection side of the lead wire 5 has a larger escape of heat than the opposite side, and is hardly heated. Therefore, more uniform heating can be achieved by making the electrode spacing at the end on the lead wire 5 connection side narrower than the electrode spacing at the end on the opposite side.

It is also preferable to add an element such as a thermostat and appropriately control the temperature of the mirror and the heater.

[0015]

[Effect of the Invention] In the mirror with a heater according to the present invention, the heating resistor also serves as the reflection film, and there is no need to form a complicated heating resistor pattern or a complicated electrode pattern, and the mirror is uniform with only a simple electrode shape. It is inexpensive because it can be heated
Thermal efficiency, uniform heating, water droplets attached to the surface,
Ice and the like can be quickly removed. In addition, as a mirror substrate,
When the same glass as that of the related art is used, it has the same durability as the related art against scratches such as when washing a car.

[Brief description of the drawings]

FIG. 1 is a schematic rear perspective view of an embodiment of the present invention.

FIG. 2 is a schematic vertical sectional view of FIG.

FIG. 3 is a schematic rear perspective view of another embodiment of the present invention.

FIG. 4 is a schematic rear perspective view of another embodiment of the present invention.

FIG. 5 is a schematic rear perspective view of another embodiment of the present invention.

FIG. 6 is a front view of the back surface of another embodiment of the present invention.

[Explanation of symbols]

1 mirror substrate 2 reflective film 3a electrodes 3b electrode 3c electrode 3d electrode 4 insulating material 5 electrode spacing d ₁ of the lead wire D ₁ central part of the electrode spacing D ₂ the central portion of the electrode distance D ₃ the central portion of the electrode distance D ₄ central portion electrode spacing d ₄ end electrode spacing in the vicinity of the electrode interval d ₃ near an end portion of the electrode spacing d ₂ near the end in the vicinity of the end portion

Claims (1)

(57) [Scope of request for utility model registration] 1. A mirror with a heater, wherein a reflecting film made of a heating resistor is formed on the back surface of a mirror substrate, and at least a pair of electrodes are provided on the reflecting film so as to face each other, the heating film comprises a heating resistor of the facing electrode. In the electrode in contact with the reflective film, the electrode interval at least near the end of the mirror substrate is smaller than the electrode interval at the center , and
A mirror with a heater , wherein a distal end portion forming a gap has a width .