JPH06112716A - Glass antenna for vehicle - Google Patents

Abstract

PURPOSE:To provide a glass antenna for vehicle which can be used with other antennas with no interference caused with other antennas and also can share its installing space. CONSTITUTION:An antenna conductor pattern 2 exclusive for FM radio reception is formed on the surface of a window glass 1 by means of a conductor paste together with a blur eliminating hot wire conductor pattern 3 formed by means of a resistance paste respectively. Then a conductor pattern 4 for transmission/reception of a car telephone is unified with the pattern 2. At the same time, an antenna conductor is connected to the part where the excited current of the pattern 4 is set at zero. In such a constitution, the influence given to the transmission/reception antenna from a reception-only antenna can be suppressed as much as possible. Thus it is possible to prevent the occurrence of the interference noises and also to secure the installing space of a glass antenna for vehicle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle glass antenna in which a conductor is patterned on a window glass of a vehicle, and in particular, a conductor pattern of a transmitting / receiving antenna for a telephone or the like is formed as a part of a conductor pattern of another antenna. The present invention relates to a glass antenna for a vehicle, which is incorporated and integrally formed.

[0002]

2. Description of the Related Art In vehicles such as automobiles, AM, FM
It is common practice to dispose a radio receiving antenna on a windshield. For example, the actual development Sho 59-14
As disclosed in Japanese Patent No. 3107 and the like, there is known one in which a conductive paint (conductor paste) is printed on a glass surface to form an antenna conductor pattern having a predetermined shape. Further, a heat wire for removing fogging is also provided on the windshield glass, and similarly, a heat wire conductor pattern is formed by a resistance paste. It is also known that an antenna wire is embedded in an intermediate film portion of laminated glass or a tungsten wire is embedded as a heat wire, instead of forming a pattern by printing a conductor paste on the glass surface. Furthermore, the function of an AM antenna is also added to the heat wire conductor so that the heat wire conductor is also used.

[0003]

By the way, in recent years, mobile phones, so-called car phones, have been attracting attention as equipment for vehicles such as automobiles, and an antenna for both transmission and reception of this phone is also arranged on the windshield. There is a demand to set it up. However, as described above, the windshield has the antenna conductor pattern and the heat ray conductor pattern dedicated to radio reception, and thus there is a problem that there is no sufficient empty space and it is difficult to secure an installation space.

Further, since a car telephone transmits and receives a weak high-frequency signal, it is easily affected by external interference, and therefore the antenna should be arranged carefully.

The present invention has been made in view of the above circumstances, and an object thereof is to allow an antenna for both transmission and reception of a car telephone or the like to be installed side by side with another antenna or the like on the glass surface of the vehicle, and the installed antenna. Another object of the present invention is to provide a glass antenna for a vehicle, which can prevent interference with the like and can consolidate the installation space.

[0006]

In order to achieve the above object, the present invention is directed to forming a conductor pattern of a reception-only antenna such as a radio and a conductor pattern of a transmission / reception antenna such as a telephone on a window glass of a vehicle. A part of the conductor pattern of the transmitting / receiving antenna where the excitation current is zero is connected to the conductor pattern of the receive-only antenna and is incorporated into the conductor pattern to be integrally formed.

[0007]

According to the present invention having the above-described structure, the conductor pattern of the antenna for both transmission and reception is formed by interposing it on the antenna pattern dedicated to reception of a radio or the like to secure the installation space. At this time, since the portion of the conductor pattern of the transmitting / receiving antenna where the excitation current is zero is connected to the conductor pattern of the receiving antenna to be interposed, the influence of the receiving antenna on the transmitting / receiving antenna should be suppressed as much as possible. The interference noise can be suppressed.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a front view showing a preferred embodiment of a vehicle glass antenna according to the present invention, which shows a rear window glass of an automobile.

The window glass 1 is provided with an FM radio reception-only antenna, a frost-free heat wire, and a mobile phone transmission / reception antenna. That is, on the surface of the window glass 1, the conductor pattern 2 of the antenna for exclusive reception of the FM radio is formed by the conductor paste, and the heat wire conductor pattern 3 for removing the fog is formed by the resistance paste. Further, the antenna conductor pattern 2 is integrally formed with the conductor pattern 4 of the antenna for both transmission and reception of a car telephone. An antenna for both transmission and reception of a car telephone is a so-called loop antenna, and its conductor pattern 4 has a substantially ∞ shape, and is connected in series to the antenna conductor pattern 2 at two points where its excitation current is zero. Has been done.

As shown in FIG. 2, the conductor pattern 4 of the transmitting / receiving antenna of the car telephone is connected to a wireless device 5, and a handset 6 is connected to the wireless device 5, and both hands 5 and 6 are connected. Voice signals and control signals are exchanged between them.

Therefore, in the glass antenna for a vehicle thus constructed, the conductor pattern 4 of the antenna for both transmission and reception is interposed and formed on the conductor pattern 2 of the antenna for reception only of the FM radio, so that the space for disposing the antenna is sufficient. Can be secured. In addition, since the portion of the conductor pattern 4 in the transmitting / receiving antenna where the excitation current is zero is connected to and integrally formed with the conductor pattern of the receive-only antenna, the conductor pattern 2 of the receive-only antenna of the FM radio is formed.
It is possible to suppress as much as possible the influence of the excitation current generated on the excitation current generated on the conductor pattern 4 of the transmission / reception antenna of the automobile telephone, and it is possible to suppress interference noise. That is, the distribution of the excitation current in the conductor pattern 4 of the transmitting / receiving antenna of a car telephone has a standing wave current distribution, and the portion corresponding to the node of this standing wave current distribution (the portion where the excitation current is zero) is always Since the amplitude is zero, even if the conductor pattern 2 of the FM-only reception antenna of the FM radio is connected here, the waveform of the excitation current generated on the transmission / reception antenna side of the mobile phone by the excitation current of the FM radio reception-only antenna Do not disturb.

In the case of an FM radio reception-only antenna, the end point of the antenna wire is a portion at which the excitation current becomes zero, and the closer it is, the smaller the current is. Therefore, the conductor of the transmission / reception antenna for a car telephone is near the end point. It is desirable to connect the pattern 4, so that interference to the FM radio side can be suppressed, and deterioration of the reception performance can be prevented.

[0013]

As described above in detail in the embodiments,
According to the glass antenna for a vehicle according to the present invention, the conductor pattern of the transmitting / receiving antenna is incorporated into the conductor pattern of the radio receiving antenna to be integrally formed, so that the installation space can be integrated and the transmitting / receiving operation can be performed. It becomes possible to secure a sufficient installation space for the dual-purpose antenna. Further, since the portion of the conductor pattern of the transmitting / receiving antenna where the excitation current is zero is connected to the conductor pattern of the receiving antenna to be interposed, the influence of the receiving antenna on the transmitting / receiving antenna can be suppressed as much as possible. It is possible to suppress the occurrence of interference noise.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a block diagram of a car phone.

[Explanation of symbols]

 1 Wind glass 2 Antenna pattern 4 Transmit / receive antenna pattern

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Issei Shigeta 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda Motor Corporation

Claims (1)

[Claims] 1. A glass antenna for a vehicle, wherein a windshield of a vehicle is formed with a conductor pattern of a reception-only antenna for a radio or the like and a conductor pattern of a transmission / reception antenna for a telephone or the like. A vehicle glass antenna, characterized in that a portion at which the excitation current is zero is connected to a conductor pattern of a reception-only antenna and integrally incorporated into the conductor pattern.