JPH01321702A - vehicle antenna - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a vehicle antenna, and particularly to an antenna for a vehicle, which can be installed close to a vehicle body and receive signals without protruding from the vehicle body, such as an automobile. The present invention relates to an antenna formed of a plurality of rod-shaped cores that can be installed along a curved surface even under installation conditions that have a curved surface, and that can provide good reception even if the direction of arrival of received waves changes while driving.

[Summary of the Invention] An antenna in which an antenna coil is wound over the entire area of a plurality of cores arranged in the longitudinal direction, and is bendable.
It can also be placed along curved surfaces.

[Prior Art] Conventionally known vehicle antennas are mainly ball-shaped antennas (whip antennas) that protrude from the vehicle body.

Additionally, some vehicles are equipped with so-called glass antennas, in which a linear antenna is mounted on the windshield. Furthermore, a system has been proposed in which a pickup coil detects and receives high frequency current induced in the roof of a vehicle.

[Problem to be solved by the invention] Therefore, the pole type antenna remains in the protruding state,
Alternatively, there is a telescopic type that can be moved in and out, but it has the disadvantage of losing the reception function due to breakage, etc., and it is necessary to consider waterproofing mechanisms suitable for the vehicle type, so there is a dedicated mounting method for each vehicle. Therefore, even if it is optimal as a receiving antenna,
Since a dedicated antenna must be installed for each reception band, the aesthetic appearance of vehicles (particularly passenger cars) is also spoiled. Therefore, something that would not protrude outside the vehicle was required.
A typical example is a glass antenna, but even if the drawbacks of the pole-type antenna mentioned above can be eliminated by preserving the aesthetic appearance of the vehicle, in recent years as reception bands have become wider, sufficient performance cannot be obtained, and the pole-type antenna is still Must be used in conjunction with an antenna.

Devices that pick up high-frequency currents induced on the roof of a vehicle, etc. are made by winding a coil around a relatively small magnetic material (ferrite core), and although they can be received in areas with strong electric fields, they cannot be received in areas with weak electric fields. Since the current induced in the vehicle body is weak, its detection amount is very small, and even if a booster is used, noise from the engine will also be picked up, making it impossible to obtain a desirable reception sensitivity.

[Object of the Invention] Therefore, an object of the present invention is to enable installation in close proximity to the vehicle body without protruding outside the vehicle, and even under installation conditions that have a curved surface, it can be installed along the curved surface, and is capable of handling not only strong electric fields but also weak electric fields. An object of the present invention is to provide an antenna that can obtain good reception sensitivity even in the field of view.

[Means for Solving the Problems] In order to achieve the above object, the present invention is characterized in that a plurality of rod-shaped cores are arranged in the longitudinal direction, and a coil is wound around the entire length of the core so that it can be bent. shall be.

[Function] A plurality of rod-shaped cores are arranged in the longitudinal direction, and a coil is wound over the entire area, and each core is connected by the winding of the coil, and each core is configured to bend each other, so it has a curved surface. Even in the case of a vehicle, it can be attached along the curved surface of the vehicle.

When the antenna of the present invention is attached to the outside of the vehicle body, it catches direct waves or waves reflected from the ground, and when it is attached inside the vehicle, it catches vehicle body induced current and direct waves from windows, etc.

That is, the vehicle body induced current or directly arriving radio waves are focused on the antenna core. In this case, the larger the cross-sectional area of the core, the more effective it is to increase the focusing rate. Furthermore, by making the coil itself correspond to the reception wavelength, it is possible to effectively catch magnetic field waves and electric field waves, and experimental results show that its reception performance is comparable to that of a pole-type antenna even in an area with a weak electric field.

[Embodiment 1] An embodiment according to the present invention will be described below with reference to the accompanying drawings. The one shown in FIG. 1 includes a plurality of rod-shaped cores 1□, 1□, 13. . . . 1n is arranged in the longitudinal direction, and the coil 2 is wound over the entire length of the core.

A cable 4 is drawn out from the coil 2 of the antenna A and connected to a receiver (not shown). The inside of the antenna A is a rod-shaped core 1□ as shown in Figure 2.
, 1□, .

The insulator 3 may be made of flexible synthetic resin, and for example, a heat shrink tube or a thin-walled material may be used. Antenna A with such a configuration includes rod-shaped cores 1□, 12. ...1n are simply connected by coils 2, and each rod-shaped core has some degree of flexibility, and as shown in the imaginary line in Fig. 1, it bends in whole or in part. Even if the car body is curved, it can be installed along the car body.
) and (b) show examples of their installation. For example, in the interior of the vehicle, a separate rope edge cover can be formed on the exterior of antenna A, which can be installed near the rear bumper, on the left and right bottom of the vehicle, or on the surface of the vehicle body panel outside the vehicle, to match the interior shape. It can be easily installed without being limited by the installation location.

[Effects of the Invention] As is clear from the above description, the antenna of the present invention has a magnetic core made up of a plurality of rod-shaped cores, and each coil is connected so as to be bendable by the antenna coil. It is possible to install along the curved surface of a shaped part.
It can be installed anywhere inside or outside the vehicle, regardless of vehicle type. In addition, it has a high focusing rate not only in strong electric field areas but also in weak electric field areas, and by winding a coil that corresponds to the wavelength of the reception band, the hearing sensitivity and reception sensitivity are improved even when the direction of arrival of radio waves changes. A good one can be obtained. The effect is great in terms of manufacturing and practical use.

[Brief explanation of the drawing]

FIG. 1 is an overall external view of an embodiment of the antenna configuration according to the present invention, FIG. 2 is a partially cutaway sectional view showing the internal structure of FIG. 1, and FIGS. It is a figure which shows a part of form. 1・・・・・・・・・Rod-shaped core, 2・・・・・・・・・
Coil, 3...Insulator, 4...
···cable. Patent applicant: Agent of Nippon Antenna Co., Ltd.
Patent Attorney Nagai 1) Takeshi Department Figure 1 Figure 2 Figure 33 (a)

Claims (1)

[Claims] A vehicle antenna characterized in that a plurality of rod-shaped cores are arranged in the longitudinal direction, and a coil is wound around the entire length of the cores so that the antenna can be bent.