JPH0911864A - Mirror device with heater - Google Patents

Abstract

(57) [Summary] [Structure] In a mirror device with a heater comprising a mirror with a heater and a support for holding the mirror with a heater, the mirror with the heater has a peripheral edge portion fixed to the support. A mirror device with a heater characterized in that In the mirror device with a heater according to the present invention, since the central part of the mirror is not in contact with the adhesive body and the support, the heat capacity of the central part of the mirror used for visual recognition is small, and the heat lost from the central part of the mirror due to heat conduction. Less is. Therefore, since the thermal energy required to raise the temperature in the central portion of the mirror is small, it is possible to quickly obtain good visibility by shortening the time required for removing water drops without increasing the power consumption of the heater.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antifogging or water drop attached to the surface of a mirror used for a vehicle door mirror or the like.
The present invention relates to a mirror device with a heater that removes raindrops, dew, ice and the like.

[0002]

2. Description of the Related Art Generally, a mirror has a mirror substrate having a transparent base material such as glass provided with a reflective film made of aluminum or chrome, and fixed to a support body for holding the mirror in a position and orientation suitable for visual recognition. Used. The mirror substrate and the support are fixed to each other with an adhesive or an adhesive because they do not rattle due to vibration, have good workability, and are low in cost. The fixed position is at or near the center of the mirror for the reason that there is no problem such as deterioration of visibility even if the position of the adhesive or the adhesive is slightly displaced.

By the way, when a general mirror as described above is used for a rearview mirror or the like, water drops or ice build up on the rearview mirror or the like when the vehicle is running during rainfall or during snowfall in cold regions. Then, the visibility of the rear side becomes insufficient and the traveling safety is impaired. For this reason, 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 water droplets and ice formation on the mirror surface. For example, Japanese Utility Model Publication No. 58-28937 discloses a vehicle rearview mirror in which a heat equalizing plate having high thermal conductivity is arranged in close contact with the back surface of a mirror plate, and a heating element is bonded to the back surface of the heat equalizing plate. Has been done. Further, Japanese Utility Model Publication No. 62-33648 discloses a mirror with a heater in which a flat heater is fixed to the rear surface of the mirror body and the heater pattern is closer to the peripheral portion of the mirror than the central portion. Furthermore, the actual Kaihei 5-1387
Japanese Unexamined Patent Publication No. 2 (1994) proposes a mirror with a heater in which a reflecting film / heating resistor is formed on the surface of a mirror substrate, and an insulating overcoat layer is provided on the surface of the reflecting film / heating resistor. These mirrors with a heater obtain a good field of view by electrically heating a heating element to heat the mirror surface.

The above mirror with a heater is fixed to a support and used in the same manner as the general mirror. The fixed position is at or near the center of the mirror.

[0005]

In the above-mentioned mirror with heater, it is required to shorten the time taken to remove water drops without increasing the power consumption. In order to reduce the time required to remove water drops, etc., it is necessary to increase the temperature rise when heating the mirror, but in order to accelerate the temperature rise of the mirror without increasing the power consumption of the heater, the heater and the mirror Between the mirror and the heat generated by the heater to increase the temperature of the mirror, and the heat lost from the mirror due to heat conduction and the heat capacity of the mirror are reduced to increase the temperature of the mirror. It is important to reduce thermal energy. However, in the conventional mirror device with a heater, since the central part of the mirror is in contact with the support, the heat capacity of the central part of the mirror is large and the thermal energy lost from the central part of the mirror due to heat conduction is large, so that water droplets etc. Was taking time. It is an object of the present invention to provide a mirror device with a heater that solves this problem.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and provides a heater-equipped mirror device comprising a heater-equipped mirror and a support for holding the heater-equipped mirror. The heater-equipped mirror device is characterized in that its peripheral portion is fixed to the support body.

Hereinafter, the present invention will be described in more detail. FIG. 1 is a schematic rear view of a mirror with a heater used in a passenger car mirror according to an embodiment of the present invention, and FIG.
It is a longitudinal cross-sectional schematic diagram of the mirror device with a heater which consists of the mirror with a heater of FIG. 1, and the support body which hold | maintains a mirror.
Reference numeral 1 is a substantially trapezoidal mirror substrate made of a transparent material such as glass. On the back surface of the mirror substrate 1, a reflection film / heating resistor film 2 made of titanium, chromium, nichrome, etc. Forming layers 2a, 2b). Further, on the back surface of the reflecting film / heating resistor film 2, in addition to the two electrodes 3 facing each other for energizing the reflecting film / heating resistor film 2, a temperature control element, an electrode wire and the like not shown are provided. The reflective film / heating resistor film 2 and the electrode 3 are provided and are insulated by the insulating layer 4. Mirror and support 6
Are fixed by an adhesive or an adhesive 5. The fixed position is a part or the whole circumference of the peripheral portion of the mirror.

[0008]

In the heater-equipped mirror device of the present invention, the time required for removing water droplets and the like is shortened because the mirror central portion is in contact with the adhesive and the support as compared with the case where the mirror central portion is fixed. This is because the central part of the mirror used for visual recognition has a small heat capacity, and the heat lost from the central part of the mirror due to heat conduction is small, so that the thermal energy required to raise the temperature in the central part of the mirror is small.

[0009]

EXAMPLES The present invention will be described in more detail below with reference to examples. Example 1 FIG. 1 is a schematic rear view of a passenger car mirror of Example 1, and FIG. 2 is a schematic vertical cross-sectional view of a mirror device with a heater including the mirror with a heater of FIG. 1 and a support for holding the mirror. Is. Nichrome film (2a) and titanium film (2b) are sequentially formed on a curved glass mirror substrate (R = 1,450 mm) 1 having a substantially parallelogram shape to a thickness of 0.05 μm and 0.04 μm, respectively, by a sputtering method. Thus, the reflective film / heating resistor film 2 is formed. Further, an electrode 3 having a width of about 5 mm for energizing the reflective film / heat generating resistor film 2 is provided on the back surface of the reflective film / heat generating resistor film 2, and a temperature control element, an electrode wire or the like not shown is attached. After that, an insulating layer 4 was provided to insulate the film, and a mirror with a heater was manufactured. Two sheet-like pressure-sensitive adhesive bodies (butyl tape) 5 having a width of 5 mm and a length of 10 cm were adhered to the long side of the mirror on the rear surface of the mirror with a heater shown in FIG. Water droplets were attached to the mirror with heater by spraying, and then heated by energizing. The time from the start of energization to the removal of water droplets to the extent that there is no hindrance to visual recognition was about 57 seconds.

Example 2 FIG. 3 is a schematic rear view of a passenger car mirror of Example 2, in which a butyl having a width of 5 mm and a length of 1 cm along the outer periphery is provided at the four corners of the mirror on the rear surface of the same mirror with a heater as in Example 1. Tape 4
The pieces were attached and fixed to the support 6. Water droplets were attached to the mirror with heater by spraying, and then heated by energizing. The time from the start of energization until the water droplets were removed to the extent that there was no hindrance to visual recognition was about 55 seconds.

Example 3 FIG. 4 is a schematic rear view of a passenger car mirror of Example 3, in which the same mirror on the rear surface of the mirror with a heater as in Example 1 has a width of 5 mm and a length of 10 cm along the outer periphery. Two butyl tapes and a short side of the mirror along the outer circumference 5mm wide and 4cm long
2 pieces of butyl tape of No. 3 were attached and fixed to the support 6. Water droplets were attached to the mirror with heater by spraying, and then heated by energizing. The time from the start of energization to the removal of water droplets to the extent that there is no hindrance to visual recognition was about 61 seconds.

Example 4 FIG. 5 is a schematic rear view of a passenger car mirror of Example 4, in which a butyl tape having a width of 5 mm along the entire outer peripheral portion of the rear surface of the mirror with a heater as in Example 1 is formed. Was adhered and fixed to the support 6. Water droplets were attached to the mirror with heater by spraying, and then heated by energizing. The time from the start of energization until the water droplets were removed to the extent that there was no hindrance to visual recognition was about 62 seconds.

Example 5 FIG. 6 is a schematic rear view of a passenger car mirror of Example 5, which is the same as Example 1 except that the width of the butyl tape in Example 1 is 1 cm. Water droplets were attached to the mirror with heater by spraying, and then heated by energizing. The time from the start of energization to the removal of water droplets to the extent that there is no hindrance to visual recognition was about 63 seconds.

Example 6 FIG. 7 is a schematic rear view of a passenger car mirror of Example 6, which is the same as Example 2 except that the width of the butyl tape in Example 2 is 1 cm. Water droplets were attached to the mirror with heater by spraying, and then heated by energizing. The time from the start of energization until the water droplets were removed to the extent that there was no hindrance to visual recognition was about 67 seconds.

Comparative Example 1 FIG. 8 is a schematic rear view of the passenger car mirror of Comparative Example 1, in which two butyl tapes each having a width of 2 cm and a length of 5 cm are attached to the central portion of the rear surface of the mirror with a heater as in Example 1. , Fixed to the support. Water droplets were attached to the mirror with heater by spraying, and then heated by energizing. The time from when the power is turned on until the water droplets are removed to the extent that it does not hinder visual recognition is about 7
It was 8 seconds.

Comparative Example 2 FIG. 9 is a schematic rear view of a passenger car mirror of Comparative Example 2, in which a butyl tape having a width of 4 cm and a length of 5 cm is attached and supported on the central portion of the rear surface of the mirror with a heater as in Example 1. It stuck to the body. Water droplets were attached to the mirror with heater by spraying, and then heated by energizing. The time from the start of energization to the removal of water droplets to the extent that there is no hindrance to visual recognition was about 79 seconds.

Comparative Example 3 FIG. 10 is a schematic rear view of the passenger car mirror of Comparative Example 1, which is the same as Comparative Example 1 except that the width of the butyl tape in Comparative Example 1 is 1 cm. Water droplets were attached to the mirror with heater by spraying, and then heated by energizing.
The time from the start of energization until the water droplets were removed to the extent that there was no hindrance to visual recognition was about 76 seconds. In addition, Examples 1 to
In 6 and Comparative Examples 1 to 3, it was visually determined whether or not there was no hindrance to visual recognition due to heating.

[0018]

The mirror device with a heater according to the present invention,
Since the central part of the mirror is not in contact with the adhesive body and the support, the heat capacity of the central part of the mirror used for visual recognition is small, and the heat lost from the central part of the mirror due to heat conduction is small. Therefore, since the thermal energy required to raise the temperature in the central portion of the mirror is small, it is possible to quickly obtain good visibility by shortening the time required for removing water drops without increasing the power consumption of the heater.

[Brief description of the drawings]

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

FIG. 2 is a schematic vertical sectional view of the mirror device with a heater shown in FIG.

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

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

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

FIG. 6 is a schematic rear view of the fifth embodiment of the present invention.

FIG. 7 is a schematic rear view of Example 6 of the present invention.

FIG. 8 is a schematic rear view of Comparative Example 1 of the present invention.

FIG. 9 is a schematic rear view of Comparative Example 2 of the present invention.

FIG. 10 is a schematic rear view of Comparative Example 3 of the present invention.

[Explanation of symbols]

 1 Mirror Substrate 2 Reflective Film / Heating Resistor Film 3 Electrode 4 Insulating Layer 5 Adhesive or Adhesive 6 Support

Claims (1)

[Claims] 1. A heater-equipped mirror device comprising a heater-equipped mirror and a support for holding the heater-equipped mirror, wherein the heater-equipped mirror has its peripheral edge fixed to the support. A heater mirror device.