JPS6245201A - Glass antenna for automobile - Google Patents

Abstract

PURPOSE:To obtain an antenna with excellent performance at a wide range reception frequency band without preventing eye field by forming independently plural transparent conductor films where at least one of resistance, film thickness, shape and area differs as an antenna element to a window glass of an automobile. CONSTITUTION:Two transparent conductor films 11a, 11b having different shape are formed to the right/left of a rear window glass 2b. Collection parts 12a, 12b provided to the conductor films 11a, 11b are connected to a switching circuit 14 via feeders 13a, 13b respectively. Then the switching circuit 14 selects alternatively a reception signal with higher gain, less noise or less distortion obtained from the conductor films 11a, 11b having different gain and directivity so as to apply diversity reception. Thus, excellent performance is obtained in a wide range of reception frequency band. Further, resistance or film thickness is made different in addition to the shape.

Description

[Detailed Description of the Invention] The present invention relates to a glass antenna suitable for various information communication devices such as radio broadcast receivers, television broadcast receivers, mobile telephones, and personal radios installed in automobiles. It is something.

[Prior art and its problems] In addition to whip antennas, antennas for radio receivers in automobiles include glass antennas in which a silver base is printed and burnt as an antenna element on the window glass of a car, and thin metal wires. Glass antennas equipped with However, in such glass antennas, the printed wires or thin metal wires are opaque, which obstructs the field of view and is not aesthetically pleasing. In particular, this tendency becomes stronger when the antenna pattern of glass antenna pre-cut wires or thin metal wires becomes complex, or when the number of wires increases. Therefore, there have been cases where such a glass antenna can be used in a limited area on the window glass of an automobile, or where the glass antenna has no choice but to be used with unsatisfactory performance.

In order to solve this problem, a glass antenna has also been proposed in which a single transparent conductive sheet 112 formed into a planar shape is used as the antenna element f. However, with a planar glass antenna made of a single transparent conductive film, it is difficult to obtain an antenna with high performance f12 in a wide reception frequency band and to be compatible with various information communication devices.

``Object of the Invention'' The object of the present invention is to provide a vehicle for use in automobiles that does not obstruct the field of view, provides excellent performance in a wide range of receiving frequency bands, and is compatible with various information and communication devices. Our goal is to provide glass antennas.

"Structure of the Invention" The automotive glass antenna according to the present invention includes a plurality of transparent conductive films each having a different resistance value, film thickness, shape, and area, each of which is independently formed on a window glass of an automobile as an antenna element. It is characterized by the presence of

In this way, by independently forming a plurality of transparent conductive films that differ in at least one of resistance value, film thickness, shape, and area, it is possible to obtain antennas with different performances such as gain and directivity. Antennas suitable for each frequency band can be selected and used, or each antenna can be used separately. Furthermore, since a transparent conductive film is used, there is almost no obstruction to visibility. Roughly speaking, by forming multiple transparent conductive films on a single window glass,
The complexity of manufacturing can be reduced.

``Embodiments of the Invention'' As shown in FIG.
c. The glass antenna of the present invention provided with a roof window glass 2d can be applied to any of these window glasses.

FIG. 1 shows an embodiment of a glass antenna according to the invention. This glass antenna is applied to the rear window glass 2b of the automobile 1, and is adapted to be applied to a diversity reception system. There are two transparent conductive films 11a with different shapes on the left and right sides of the rear window glass 2b.
, llb are formed. And transparent conductive film 11a
, llb are provided with current collectors X2a and 12b.

Furthermore, the center portions 12a and 12b are feeders &113a.
, 13b, and the feeder wires 13a, 13b are connected to the switching circuit 14.
is connected to each communication device/equipment (not shown) via or without the amplifier 15. The switching circuit 14 selects the one with higher gain, the one with less noise, or the one with less distortion among the received signals obtained from the transparent conductive films 11a and 11b having different gains and directivity characteristics so as to perform diversity reception. This is an alternative choice.

FIG. 3 shows another embodiment of the glass antenna according to the invention. This glass antenna is applied to a front window glass 2a of an automobile 1. There are two transparent conductive films 11a, ll on the left and right sides of the front window glass 2a.
b is formed. In this case, transparent conductive 1% J11a
, llb are said to have approximately the same shape and area, but have different thicknesses and resistance values, which result in different antenna performances. Transparent conductive film 11a
, llb are provided with current collectors 12a, 12b, and the current collectors 12a, 12b are connected to 74-da wires 13a, 13b. Even in this glass antenna, by selectively using two transparent conductive plates 11ajlb with different antenna performances, it is possible to apply the antenna to communication equipment of one company or to various frequency bands. Also, Toru IJ
Since the J conductive films 11a and llb do not obstruct visibility, there is no problem even with the front window glass 2a.

FIG. 4 shows still another embodiment of the glass antenna according to the present invention. This glass antenna is suitable for automobiles
This is applied to the side window glass 2c. Three transparent conductive films +1a, llb, and 11c having different shapes and areas are formed on the side window glass 2c. Each transparent conductive film 11a, 11b.

11c is provided with current collectors 12a, 12b, 12c, and the current collectors t2a, 12b, 12c are connected to the 74-da line 13.
a, 13b, and 13c. In this glass antenna, by selecting and using three transparent conductive films 11a, 1lb, and 11c with different antenna performances, it is possible to cover a wider frequency band or apply it to more communication devices. Becomes a department.

In addition, in Figures 1 and 3, two transparent conductive films with different antenna performances are formed on the window glass of a car.

Furthermore, although Fig. 4 shows an example in which three transparent conductive films with different antenna performances are similarly created, it is also possible to form four or more independent transparent conductive films with different antenna performances on a single glass plate. You can also do it.

In the glass antenna of the present invention, two transparent conductive films a and 11b having different shapes, resistance values, film thicknesses, areas, etc. may be used as selective antennas of a diversity receiving antenna system, or In addition, the two transparent conductive films 11a and 11b can be applied to predetermined reception frequency bands, for example, one of the transparent conductive films 11a and 11b can be used as a TV broadcast antenna, the other as a radio broadcast antenna, or One can be used as an antenna for AM radio broadcasting and the other as an antenna for F'M radio broadcasting, or one can be used as an antenna for VHF television broadcasting and the other can be used as an antenna for UHF television broadcasting, or one can be used as an antenna for television broadcasting. As an antenna,
The antenna can be applied to various communication devices or broadcasting in various frequency bands, such as by using the other antenna as an antenna for a car phone or using each as an antenna for other different frequencies. Moreover, the transparent conductive film 11a,
Since llb does not obstruct the field of view, its shape and area can be freely set to obtain desired antenna performance.

In addition, in the above embodiment, the transparent conductive films 11a and 11b
For example, In2O3 (containing S!1), 5nOz
(contains Sb or F), TiO2/Ag/TiO2,
5nOz/Ag/SnO+.

5n02/Au/S! +02.5n02/A I/5n
02, various transparent conductive films made of ZnS/Ag/ZnS etc. can be used. These transparent conductive films may be a single layer, or may be laminated into two or more layers, or may be laminated with transparent dielectric films made of various materials in order to improve durability or improve optical properties. The transparent conductive film may be formed directly on the glass surface by an appropriate film forming method such as vacuum evaporation, sputtering, CVO, spray, GLC, or printing, or A transparent conductive film 71 may be formed on a plastic film surface by the same method as above, and this plastic film may be laminated on a glass surface. This transparent conductive film can be formed by adjusting the material and thickness. A desired resistance value can be obtained. Note that in the front window glass 2a and rear window glass 2b of the automobile 1, there is a rule that the visible light transmittance is 70% or more, so the visible light transmittance of the transparent conductive film is 70% or more.
% or more is preferable.

In addition, in the above embodiment, the current collectors 12a and 12b are
It is made of a material with higher conductivity than the transparent conductive films 11a and 11b, and is used to attach the feeder lines 13a and 13b via a solder layer, a conductive adhesive layer, etc. The current collectors 12a and 12b are made of a conductive material such as conductive paste, conductive adhesive, copper foil, aluminum foil, or copper mesh wire.

"Effects of the Invention" As explained above, according to the present invention, a plurality of transparent conductive films each having a different resistance value, film thickness, shape, and area are independently formed on the window glass of an automobile. Therefore, by selecting each transparent conductive film and using it as an antenna, it is possible to cover a wide frequency band and apply it to various communication devices. Moreover, since the transparent conductive elements 1 to 2 do not obstruct visibility, they can be formed in any desired shape and area on any part of the window glass, thereby achieving desired performance. Furthermore, since a plurality of transparent conductive films are formed on a single window glass, the complexity of manufacturing is also reduced.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of a glass antenna for an automobile according to the present invention, and FIG. 2 is a section II-II in FIG. 1.
3 is a front view showing another embodiment of the automotive glass antenna according to the present invention; FIG. 4 is a front view showing still another embodiment of the automotive glass antenna according to the present invention; FIG. 5 is a plan view showing an example of an automobile to which the present invention is applied. ■713a/13b 1. J Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] A glass antenna for an automobile, characterized in that a plurality of transparent conductive films having at least one of different resistance values, film thicknesses, shapes, and areas are independently formed as antenna elements on a window glass of an automobile.