JPS6115403A - Window glass for automobile with antenna - Google Patents

Abstract

PURPOSE:To obtain an antenna being not an obstacle as a projection and in which no lateral fringe appears as an antenna element line by providing a transparent conductive thin film functioned as the antenna nearly over the entire surface of a window glass for an automobile. CONSTITUTION:A transparent conductive thin film 3 (indium oxide, indium oxide-tin solid solution, indium oxide-fluorine solid solution, tin dioxide, and tin dioxide-fluorine solid solution) is formed on the entire face of the automobile rear window glass (wind shield glass, side wind glass, quarter window glass) 1 by means of the sputtering. The transparent conductive thin film 3 is connected to an antenna amplifier 9 via a lead wire 8 to connect a radio set 10 and a power supply 11. Then the AM broaddcast is received by turning on the switch of the radio set 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an automobile windshield with an antenna.

[Prior art]

Currently, whip antennas, horn antennas, and the like are used as receiving or transmitting antennas in automobiles. However, since these antennas protrude outside the vehicle interior, there are problems in that air resistance increases, they are easily affected by wind noise, they are unfavorable from a safety standpoint, and they also detract from aesthetics.

Recently, as a countermeasure to this problem, in order to eliminate the protrusions, for example, as shown in Japanese Utility Model Application Publication No. 58-23417, antenna wires are buried in the windshield, or the antenna is placed on the surface of the windshield. Materials with attached wires are increasingly being used. However, although the above-mentioned problem is solved when the antenna element wire is buried or attached, horizontal stripes of the antenna element wire are visible from outside or inside the vehicle, and therefore, there is a problem that it is unsightly and visibility is poor.

[Purpose of the invention]

The present invention has been made to solve the problems of the prior art described above, and an object of the present invention is to provide an automobile windshield equipped with an antenna that does not form a protrusion and does not show horizontal stripes like antenna wires. There is a particular thing.

[Structure of the invention]

According to the invention, this object is achieved by the following antenna-equipped automobile windshield.

That is, the automotive windshield with an antenna of the present invention is provided with a transparent conductive thin film that functions as an antenna over substantially the entire surface of the windshield, and this transparent conductive thin film is connected to the automotive audio equipment and the automotive audio equipment through the antenna amplifier. It is characterized by being connected to a power source.

In the present invention, a windshield glass, a rear window glass, a side window glass, a quarter window glass, etc. can be used as the automobile window glass.

As a transparent conductive thin film, indium oxide (In20
3), tin (tin) is added to this indium oxide as a dopant.
Indium oxide using Sn) or fluorine (F)
Linear solution (ITO), indium oxide-fluorine solid solution, tin dioxide (SnO2), tin dioxide-fluorine solid solution using fluorine (F), phosphorus (P) or antimony (Sb) as a dopant in this tin dioxide, tin dioxide - phosphorus solid solution, cotton dioxide - antimony solid solution can be used.

The thickness of this transparent conductive thin film is preferably about 1 μm, and the sheet resistance is preferably low.

That is, although the sheet resistance may be about 100, it is desirable to set it to 5Ω or less.

This transparent conductive thin film can be produced by vacuum evaporation, sputtering,
It is formed on the window glass by a vacuum film forming method such as ion blasting, or a chemical vapor deposition method (CVD) such as hydrolysis reaction or thermal decomposition reaction.

The transparent conductive thin film used in the present invention has conductivity and thus functions as an antenna.

〔Effect of the invention〕

As described above, the antenna-equipped automobile window glass of the present invention has the following effects.

(a) Since the transparent conductive thin film that functions as an antenna is a thin film and is provided almost on the entire surface of the glass, horizontal stripes unlike conventional antenna wires are not visible, improving visibility.

(b) Since the transparent conductive thin film has conductivity, it can easily be used in combination with other functions, such as a heater function and a heat ray blocking function.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

(First Example) This example shows an example in which the present invention is applied to a rear window glass.

Here, FIG. 1 is a schematic configuration diagram of an automobile windshield with an antenna according to a first embodiment of the present invention.

After thoroughly cleaning a transparent substrate l in the shape of an automobile rear window glass with an organic solvent and pure water, silver paste 2 containing a glass frit as an electrode was screen printed on the upper and lower sides as shown in Fig. 1. After drying for 20 minutes at 5°C
Bake at 00°C for 30 minutes. At this time, in order to eliminate the level difference (usually about 50 μm) between the electrode surface and the glass surface, polishing is performed using an abrasive containing alumina fine powder to eliminate the level difference.
Create a gently sloping surface.

Subsequently, the entire transparent substrate 1 was placed in a sputtering vacuum chamber, and a transparent conductive thin film was formed by sputtering. First, the inside of the vacuum chamber is 2X10-5T.

After exhausting to about rr, 2 x 10"-@T o
Argon gas is introduced up to r. At this time, ITO
Using a sintered target (ITO containing 19 wt% SnO2), an ITO film 3 having a thickness of about 1 μm is formed as a transparent conductive thin film functioning as an antenna. Zirconium oxide was sputtered using the same method to form a transparent protective film. Next, a terminal for taking out the lead wire 4.5 is connected to each end of the electrode 2 by soldering.
The lead wire 4.5 was connected to the choke coil 7 which is connected to the defogger switch 6. Further, the ITO film 3 was connected to an antenna amplifier 9 via a lead wire 8. This antenna amplifier 9 is connected to a radio 10 and a power source 11.

As a result, an automobile rear window glass 12 with an antenna shown in FIG. 1 was obtained. When the radio 10 was turned on using this automobile rear window glass 12 with an antenna, AM could be received.

In addition, this car rear window glass with antenna 1
After steam was sprayed onto the ITO film 2 to make it cloudy, the defogger switch 6 was turned on and electricity was applied to the ITO film 3 as a transparent conductive thin film, whereby the ITO film 3 generated heat and the fog was removed.

As described above, the transparent conductive thin film of this example has both the functions of an antenna and a heater.

(Second Example) The second example shows an example in which a transparent conductive thin film has an antenna and a heat ray blocking function.

FIG. 2 is a schematic configuration diagram showing an automobile windshield having a single antenna according to a second embodiment of the present invention, and FIG. 3 is an enlarged cross-sectional view taken along the line ■--■ in FIG.

In FIG. 2, a transparent conductive thin film 3 having an antenna function is formed in the hatched area.

In FIG. 3, 1 is a glass substrate, on which an ITO film 3 as a transparent conductive AT film having an antenna function is provided, and furthermore, a heat ray reflective film 13 is provided on the IT0 film 3. This glass substrate 1 and ITO
The film 3 and the heat ray reflection film 13 form the antenna-equipped rear window glass 12 of the present invention. Note that the ITO 3 is connected to an antenna amplifier 9 via a lead wire 8 as in the first embodiment.

As shown in FIG. 3, the heat ray reflecting film 13 consists of six layers of optical thin films. As this optical thin film, titanium oxide (TiO□) 13a, which is a high refractive index material, and silicon dioxide (SiO2) 13b, which is a low refractive index material, are used and are alternately layered.

The optical thickness nd (n is the refractive index, d is the film thickness) of the optical thin film 13a of titanium oxide and the optical thin film 13b of silicon dioxide is as follows:
Each is 1/4 of the wavelength of the infrared rays to be reflected. Further, the optical thickness nd of the silicon dioxide optical thin film 13b forming the uppermost layer is 1/8 of the wavelength of the infrared rays.

For example, if the wavelength of infrared rays to be reflected is set to about 1050 mμ, the refractive index of titanium oxide corresponding to this wavelength is about 2.3, and the refractive index of silicon dioxide is about 1.45, so in this case, oxidized The thickness of the optical thin film 13a of titanium is about 1040 mm, and the thickness of the optical thin film 13b of silicon dioxide is about 1810 mm1, and only the top layer optical thin film 13b of silicon dioxide has a thickness of about 900 mm.

The thickness of the ITO film 3 was set to 0.8 μm in this example.

The ITO film 3 and the heat ray reflective film 13 were formed on the glass substrate 1 and the ITO film 3, respectively, by the RF magnetron sputtering method. However, the substrate was heated to 350° C. only during ITO sputtering.

When the radio 10 was turned on using the automobile rear window glass 12 with an antenna obtained in this example, it was possible to receive AM as in the first example.

Further, in the case of this example, the heat ray blocking effect was improved by about 30% compared to the case where the ITO film 3 as the transparent conductive thin film was not provided (the case where only the heat ray reflective film was provided). This is because the ITO film 3 absorbed the heat rays.

Although specific embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and includes various embodiments within the scope of the claims. .

For example, in the embodiment, the present invention is applied to a rear window glass, but it can also be applied to other window glasses such as side window glasses and windshield glasses.

In addition, although the example shows an example in which the antenna and heater function and the antenna and heat ray blocking function are combined, it is also possible to have only the antenna function, or it is also possible to have the three functions of antenna, heater, and heat ray blocking function. can.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an automobile windshield with an antenna according to a first embodiment of the present invention, and FIG.
FIG. 3 is a schematic configuration diagram showing an automobile windshield with an antenna according to an embodiment, and FIG. 3 is an enlarged sectional view taken along line mm in FIG. 1-・-・Transparent substrate ('glass substrate) 2・-・・-・Electrode 3-・-ITOli (transparent conductive thin film) 4.5.8--
---Lead wire 6-- Defogger switch? ------- Choke coil 9 ---- Antenna amplifier 10 - Radio 11 - Power supply 12 - Automobile rear window glass with antenna 13 - Heat ray reflective film 13a - titanium oxide film 13b - silicon dioxide film Fig. 1

Claims (1)

[Claims] (1) A transparent conductive thin film that functions as an antenna is provided over almost the entire surface of the window glass, and this transparent conductive thin film is connected to automotive audio equipment and a power source via an antenna amplifier. Automotive window glass with antenna.