JPH05167327A - Antenna system for vehicle - Google Patents

Abstract

PURPOSE:To improve the reception sensitivity of a radio wave without deteriorating a good appearance by providing in a state that an antenna wire allowed to bend along plural opening parts provided on a tray on a metallic rear package tray arranged on the rear part side of a car room. CONSTITUTION:In a dash panel 3 of the front part side of a cabin 2 of a vehicle 1, an audio console 4 positioned in about the center in the car width direction and having a reception circuit for a radio broadcast is provided and also on both left and right side parts, a front loudspeaker 5 is provided, respectively. Also, in a rear package tray 6 provided on the rear part side of the cabin 2, an air cleaner 7 positioned in about the center in the car width direction is provided and also on both left and right sides, a rear loudspeaker 8 is provided, respectively. Moreover, on the upper part of a rear windowpane 9, a printed antenna for receiving a radio broadcast is provided and in this case, an antenna wire 14 is allowed to run along opening parts 11a and 11b provided in order to install the loudspeaker 8, and the side edge of an opening part 11c for installing the cleaner 7 and mounted while fixing it with a flip 15 made of a synthetic resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle antenna device.

[0002]

2. Description of the Related Art In recent years, various radio wave receiving devices such as wireless telephones have been installed in vehicles in order to increase added value. In that case, if each radio wave receiving device is equipped with a receiving antenna, various troubles will occur, such as the antenna becoming forested and the appearance of the antenna deteriorate.

To solve such a problem, there is an idea of sharing the antenna of a car radio and the antenna of a radio wave receiver which are standardly equipped in a vehicle. For example, in Japanese Patent Laid-Open No. Sho 60-92581, a radio wave receiver constituting a keyless entry system and a car radio are supplied with a high frequency signal received by a common antenna separated by a frequency band using a branching device. The configuration is shown. According to this, there is an advantage that it is not necessary to additionally equip a dedicated reception antenna for the keyless entry system.

[0004]

However, according to the prior art described in the above publication, the radio wave receiver, the car radio and the antenna are organically combined when viewed in an alternating current, and the reception of the antenna is performed. The possible frequency must be set to a wide band that covers the reception bands of both the radio wave receiver and the car radio, and there is a problem that the reception sensitivity decreases accordingly. In addition, there is the trouble that the tuning of the receiving system must be changed depending on the presence or absence of the radio wave receiver between the vehicle equipped with the keyless entry system and the vehicle not equipped with the system.

The present invention addresses the above problems in a vehicle antenna device, and an object thereof is to realize a vehicle antenna device capable of receiving radio waves with high sensitivity without deteriorating the appearance of the vehicle.

[0006]

That is, in a vehicle antenna device according to claim 1 of the present application, a metal panel member having an opening is provided in a vehicle compartment, and the side of the opening of the panel member is provided. It is characterized in that the antenna wire is arranged along the edge.

The vehicle antenna device according to claim 2 of the present application is characterized in that, in the structure of claim 1, the metal panel member is a metal rear package tray having an opening.

[0008]

According to the vehicle antenna device of the first and second aspects, the side edge of the opening formed in the metal panel member is
Since the high frequency current induced by the radio wave flows intensively, a strong induced current resulting from the high frequency current is induced in the antenna wire arranged at the side edge of the opening. As a result, the radio wave can be received with high sensitivity even in the passenger compartment where the radio wave condition is not good. Moreover, since the metal panel member is disposed inside the vehicle, the appearance from the outside of the vehicle is not deteriorated.

Particularly, according to the vehicle antenna device of the second aspect, the antenna wire is arranged along the side edge of the opening in the metal rear package tray having the opening for mounting the speaker and the like. Therefore, there is an advantage that the manufacturing cost is reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, an audio console 4 having a receiving circuit for radio broadcasting is provided on a dash panel 3 on the front side of a passenger compartment 2 of a vehicle 1 at a substantially central position in the vehicle width direction. In addition, the front speakers 5 and 5 are respectively disposed on the left and right sides.

On the other hand, a rear package tray 6 provided on the rear side of the vehicle compartment 2 is provided with an air purifier 7 at a substantially central position in the vehicle width direction, and is located on both left and right sides. Speakers 8 and 8 are provided respectively.

On the upper part of the rear window glass 9,
A print antenna 10 for receiving a radio broadcast is provided, and radio broadcast radio waves received by the print antenna 10 are transmitted to the audio console 4 via a radio antenna cable (not shown). .

As shown in FIG. 2, the rear package tray 6 is formed by processing a metal plate such as an iron plate in accordance with the shape of the vehicle body at the rear of the passenger compartment, and the rear speakers 8 and 8 are provided at both ends thereof. 11a, 11 for mounting the
b are formed respectively, and an opening 11c into which the air purifier 7 is mounted is formed in the center. The rear speakers 8, 8 and the air purifier 7 are attached to the openings 11a, 11b, 11c in an insulated state.

In the rear package tray 6, as shown in FIG. 3, an antenna wire 14 which is a covered wire in which a core wire 12 is covered with an insulating coating 13 is provided with the opening 11 described above.
It is arranged in a bent state along the side edges of a, 11b, and 11c. Clips 15 ... 15 made of synthetic resin are adhered to the antenna wire 14 at appropriate intervals, and as shown in FIG.
Is inserted into the small hole 16 formed in the rear package tray 6, and the engaging portion 15b provided at the lower end of the shaft portion 15a is engaged with the rear surface side of the tray 6 so that the rear package tray 6 It is designed to be fixed integrally.

A coaxial cable 17 is connected to one end of the antenna wire 14, and the coaxial cable 17 is connected to an antenna terminal of a radio wave receiver (not shown). The rear package tray 6 has an antenna wire 14
Also, with the coaxial cable 17 attached, it is covered with, for example, a cover made of synthetic resin.

Here, since high-frequency currents induced by radio waves concentrate on the side edges of the openings 11a, 11b, 11c formed in the rear package tray 6, these openings 11a are formed. , 11b, 11c
A strong induction current due to the high frequency current is induced in the antenna wire 14 arranged on the side edge of the. As a result, the radio wave is received with high sensitivity even in the passenger compartment 2 where the radio wave condition is not good.

Next, the opening 1 of the rear package tray 6
The result of an experiment conducted to confirm the improvement of the reception sensitivity due to the antenna wire 14 arranged around 1a, 11b, and 11c will be described.

That is, for example, centering at 63 MHz, 62 MHz which is 1 MHz lower than this frequency, and 1 MH
The intensity of the received signal was compared between the case where there is an opening and the case where the opening is closed at three frequencies of 64 MHz, which is z high. As a result, as shown in FIG. 4, it was confirmed that the reception sensitivity was lowered in the order of 2 to 4 dB when there was no opening, with reference to the reception intensity of 63 MHz when there was an opening.

In the present embodiment, the opening 1 is provided in the existing metal rear package tray 6 having the openings 11a, 11b, 11c for mounting the rear speaker and the like.
Although the antenna wire 14 is arranged along the lines 1a, 11b, and 11c, it is not limited to this.

[0020]

As described above, according to the vehicle antenna device of the first and second aspects, the high frequency current induced by the radio wave is concentrated on the side edge of the opening formed in the metal panel member. As a result, the strong induction current resulting from the high frequency current is induced in the antenna wire arranged on the side edge of the opening. As a result, the radio wave can be received with high sensitivity even in the passenger compartment where the radio wave condition is not good. Moreover, since the metal panel member is disposed inside the vehicle, the appearance from the outside of the vehicle is not deteriorated.

Particularly, according to the vehicle antenna device of the second aspect, the antenna wire is provided along the side edge of the opening in the metal rear package tray having the opening for mounting the speaker or the like. Since it only needs to be arranged, there is an advantage that the manufacturing cost is reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a part of a vehicle with a ceiling portion cut away.

FIG. 2 is a plan view of the rear package tray with the antenna wire attached.

FIG. 3 is a cut end view showing a state cut along line AA in FIG.

FIG. 4 is a graph showing the results of an experiment conducted to confirm the effect.

[Explanation of symbols]

 1 Vehicle 2 Cabin 6 Rear Package Tray 11a Opening 11b Opening 11c Opening 14 Antenna Wire

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshihiro Teshima No. 3 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda Co., Ltd. (72) Inventor Koichi Nishi Nishi No. 3 Shinchi, Fuchu-cho, Hiroshima Prefecture Mazda Within the corporation

Claims (2)

[Claims] 1. An antenna device for a vehicle, wherein a metal panel member having an opening is provided in a vehicle compartment, and an antenna wire is provided along a side edge of the opening in the panel member. 2. The vehicle antenna device according to claim 1, wherein the metal panel member is a rear package tray having an opening.