JPH0258404A - Antenna for vehicle and its production - Google Patents

Abstract

PURPOSE:To attain the arrangement along a curved surface even at the circular part of a vehicle by coupling an supporting bendably a core column to arrange plural stick-shaped antenna in the condition in which an elastic coil wound in a contact shape is extended at an interval coiling. CONSTITUTION:The title antenna is composed of a core column to arrange a rod-shaped core 1 like a ferrite core in a lengthwise direction, an elastic coil 2 wound over the whole area of the lengthwise direction of the core column and an insulator 3 of a flexible synthetic resin tube to surround the outer circumference. The elastic coil 2 is extended from a contact shape at an interval coil, a bending part 2a at both edges is locked to the edge surface of the rod- shaped core 1 to position at both edges of the core column and the whole of the core column is bendably coupled. Thus, even under the providing conditions having the curved surface, the antenna can be fitted along the curved surface.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a vehicle antenna, and in particular, it can be installed close to a vehicle body to receive signals without protruding from the vehicle body, such as an automobile. Moreover, even under installation conditions that have a curved surface, the vehicle can be freely installed along the curved surface, and the vehicle is made of multiple rod-shaped cores that can provide good reception even if the received wave arrival direction changes while driving. The present invention relates to an antenna and a method for manufacturing the same.

[Summary of the Invention] The vehicle antenna of the present invention is an antenna in which an antenna coil is wound over the entire area of a plurality of rod-shaped cores arranged in the longitudinal direction. It is designed so that it can be placed.

Another aspect of the present invention is that the vehicle antenna having the above structure can be easily manufactured.

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

Additionally, a linear antenna is installed on the windshield at some vehicle heights. A so-called glass antenna is used. Furthermore, a system has been proposed in which a pickup coil detects and receives high frequency current induced in the roof of a vehicle.

[Problems to be Solved by the Invention (2)] However, the above-mentioned pole-type antennas include those that remain in a protruding state, or those that extend and contract by output operation, but they have the disadvantage of losing reception function due to breakage accidents, etc. There is,
It is necessary to consider the waterproof mechanism suitable for the vehicle type.
Therefore, a dedicated mounting means must be provided for each vehicle. Therefore, even if it is optimal as a receiving antenna, a dedicated antenna must be installed for each receiving band, which results in detracting from the aesthetic appearance of the vehicle.

Therefore, there is a need for something that does not protrude outside the vehicle, and a typical example is a glass antenna.However, although the disadvantages of the pole antenna can be eliminated by maintaining the aesthetic appearance of the vehicle, in recent years the reception band has become wider. It does not provide sufficient performance and must be used in conjunction with a ball antenna.

On the other hand, 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 even if they can be received in areas with strong electric fields.

In areas with weak electric fields, the current induced in the car body is weak, so the detection range is very small, and even if a booster is used, the noise from the engine will also be picked up, so it is difficult to obtain favorable reception sensitivity. do not have.

[Object of the invention] Therefore, one object of the present invention is to
An antenna for a vehicle that can be installed close to the vehicle body and along a curved surface even under installation conditions that have a curved surface, and that can obtain good reception sensitivity not only in strong electric fields but also in weak electric fields. To provide a manufacturing method.

[Means for Solving the Problems] In order to achieve the above object, the present invention comprises a core row in which a plurality of rod-shaped cores are arranged in the longitudinal direction, and an elastic coil wound around this core row. The elastic coil is stretched from a tight coil to a spaced coil.

It is characterized by a configuration in which both ends thereof are locked to the ends of the core row, and the plurality of rod-shaped cores are bendably connected and supported by elastic coils.

The method for manufacturing the vehicle antenna includes tightly winding an elastic coil, and sequentially inserting a plurality of rod-shaped cores into the hollow portion of the elastic coil.

As a result, the elastic coil is expanded from a close coil to a spaced coil.
The gist is that both ends thereof are locked to the ends of the core row.

[Function] In the vehicle antenna having the above configuration, a plurality of rod-shaped cores are arranged in the longitudinal direction, and elastic coils are wound at intervals over the entire area, and each rod-shaped core can be bent freely by winding the elastic coil around the outer periphery. Even in the case of a vehicle having a single curved surface, it is possible to install it along the curved surface.

When the vehicle antenna having the above configuration is installed on the outside of the vehicle body, it catches direct waves or waves reflected from the ground, and when it is installed 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, in order to increase the focusing rate, the larger the cross-sectional area of the core, the more effective it is.
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 ball-shaped antenna even in weak electric field regions.

[Embodiment] FIGS. 1 to 7 show an embodiment of the present invention.

In the figure, A is a vehicle antenna, which includes a core row in which rod-shaped cores 1 such as ferrite cores are arranged in the longitudinal direction, an elastic coil 2 wound over the entire length of the core row, and the outer periphery of the core row. The elastic coil 2 is extended from a close-contact shape to a spaced winding, and has bent portions 2a at both ends.
are locked to the end faces of rod-shaped cores 1 located at both ends of the core row.

The entire core row is thereby bendably connected. 4 is a receiver connection cable drawn out from the coil 2.

FIG. 5 shows an example of a method for winding the elastic coil 2 around the rod-shaped core 1.

That is, the elastic coil 2 is tightly wound with the required number of turns, one of the coil openings is closed with the bent portion 2a, and the required number of rod-shaped cores 1 are inserted into the hollow part of the coil from the other coil opening. By sequentially inserting the last rod-shaped core 1 and making a bent portion 2a on the end surface of the last rod-shaped core 1 and locking it, the tightly-fitted elastic coil 2 is stretched approximately evenly over the entire core row, and thereby a large number of rod-shaped cores are It is supported bendably by the stretched elastic coil 2.

In the vehicle antenna A configured as described above, a large number of rod-shaped cores 1 are simply connected and supported by elastic coils 2, and each of the rod-shaped cores has some degree of flexibility. As shown in FIGS. 6 and 7, it is bendable in whole or in part, and can be placed along the vehicle body even if the vehicle body is curved. for example,
Inside the vehicle, it can be easily attached to the outside of the vehicle near the rear bumper, on the left and right bottoms of the vehicle, or on the panel surface of the vehicle body, depending on the shape of the interior.

Moreover, according to the method of sequentially inserting the rod-shaped cores into the elastic coils that have been brought into close contact with each other as described above, the assembly work can be significantly simplified compared to the method of winding the coils around the outer periphery of the cores. That is, in order to wind coils around rod-shaped cores arranged in rows, it is necessary to prepare a special device that combines means for holding the core rows and a coil winding machine, but according to the above method, elastic The coil is tightly wound using a coil forming machine at Shudo, and all you need to do is insert the rod-shaped core into it, so there is no need for special manufacturing equipment, and it is extremely easy to make using a simple jig. be able to.

8 and 9 are other embodiments of the present invention, in which a plurality of antennas A are bundled together, and according to this structure.

The antenna can be made compact and installed according to the purpose of use.

[Effects of the Invention] As described in 1., the vehicle antenna according to the present invention has a core row in which a plurality of rod-shaped antennas are arranged, and a tightly wound elastic coil that is stretched into spaced turns. Since it is configured to be connected and supported in a bendable manner, it can be installed along the curved surface of a circular part of the car body, and it can be installed anywhere inside or outside the car body, regardless of the type of car. be able to.

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 receiving band.

Even if there is a change in the direction of arrival of radio waves, good audibility and reception sensitivity can be obtained.

In addition, according to the method of the present invention, the vehicle antenna having the above structure can be manufactured very simply and easily by simply sequentially inserting the rod-shaped cores into the hollow portion of the tightly wound elastic coil.

[Brief explanation of the drawing]

FIG. 1 is a side view of a vehicle antenna showing an embodiment of the present invention, FIG. 2 is a partially enlarged sectional view, FIG. 3 is a side view of the main part of the antenna, and FIG. 4 is an end view thereof. Fig. 5 is an explanatory diagram showing the assembly showing the manufacturing state of the vehicle antenna, Figs. 6 and 7 are side views showing a part of the bent state of the vehicle antenna, and Fig. 8 shows another embodiment. A side view of the vehicle antenna, and FIG. 9 is an end view thereof. A: Vehicle antenna, 1: Rod-shaped core. 2...Elastic coil, 2a...
folded part. 3...Insulator, 4...Cable.

Claims (2)

[Claims] (1) Consists of a core row in which a plurality of rod-shaped cores are arranged in the longitudinal direction, and an elastic coil wound around this core row. A vehicle antenna, wherein the plurality of rod-shaped cores are connected and supported in a bendable manner by an elastic coil. (2) An elastic coil is tightly wound, a plurality of rod-shaped cores are sequentially inserted into the hollow part, and both ends of the elastic coil, which has been extended from a tight coil to a spaced coil, are respectively engaged with the ends of the core row. A method of manufacturing a vehicle antenna characterized by stopping the antenna.