JPS5937882B2 - telescopic antenna mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the invention of a telescoping antenna device, and is intended to provide a telescoping antenna device that has an extremely simple structure, is easy to manufacture, and is suitable for mass production.

2. Description of the Related Art Telescopic antennas have been generally known as antennas used in receiving mechanisms.

In other words, this telescoping antenna can be expanded and contracted as needed during use, and therefore has the advantage of allowing a long antenna to be retracted and retracted as appropriate, especially when used in portable receiver equipment or in-vehicle equipment. It is widespread.

However, such a telescopic antenna is made by assembling multi-stage tubular members so that they can be expanded and contracted, and requires a lot of man-hours and materials to manufacture, making it inevitably quite expensive and requiring manual manufacturing methods. There are disadvantages that you have to rely on.

In order to assemble a multi-stage tubular member as described above in an expandable and retractable manner, it is not only necessary to have a large number of pipes with sequentially different diameters, and to cut them to a predetermined length. It is necessary to ensure that these tubes lock each other when pulled out, and that they do not immerse beyond a predetermined position when condensed, and that they are electrically connected accurately in any state. It is required to form a conductive state.

Therefore, it is necessary to assemble a bullet piece to each tube as described above, and to form an extremely narrow portion at the upper end of the tube.In particular, when assembling the bullet piece, it is necessary to have a specific shape and configuration. It is necessary to prepare the bullet piece, cut and drill holes in the pipe material to attach it, and also process it by attaching it to the body, bending it, etc., so these processes are very multi-step and have to be done manually. In many fields, it is necessary to carry out the manufacturing process manually, and in any case, it is clear that manufacturing and assembling them not only requires a lot of man-hours and costs, but is also inefficient.

The present invention was created through repeated research to eliminate the disadvantages and shortcomings of the conventional telescopic antennas as described above.

That is, one of the basic characteristics of the present invention is that instead of using a multistage pipe material as described above, a carbon fiber rod-shaped material is used, which is made by bonding and molding carbon fibers into a rod shape with epoxy, polyester resin, or other binder. It's about using it.

This carbon fiber rod-shaped material is obtained by subjecting acrylic fibers to flame-retardant processes, carbonization processes, graphitization processes, and surface treatment, and is used for cloths, mats, etc., and is used to make rods. Although it has not been possible to put it into practical use as a material with sufficient strength for, for example, fishing rods, the electrical conductivity of this material is comparable to that of nichrome wire. Considering its good electrical conductivity, it can be used as an antenna.

However, this rod has sufficient strength even if it lacks the toughness of steel wire, and it also has extremely good linearity, so it has traditionally been used in a straight state like the fishing rod mentioned above. However, according to studies conducted by the present inventors, this product is more than 30 times the diameter of the rod when bent, and even with a sufficient safety factor, it is larger than the diameter of the rod. If the bending radius is 45 times or more, it is possible to bend it, and even after it has been bent for a considerable period of time, by releasing the bend, it can instantly restore its straight shape and prevent its bending habit. It was confirmed that there was nothing left behind, and that even if it broke if the above limit was exceeded, it could be bent arbitrarily within the limit, and would not be damaged or deformed even by fairly severe bending operations.

That is, the present invention provides a telescoping antenna that utilizes the characteristics of such a carbon fiber rod-like material.

Another feature of the present invention is that a bending guide member that imparts a bending state within the above-mentioned limits to the above-mentioned carbon fiber rod-shaped material is applied, and such a bending guide member and assemble it so that it can slide freely.

The bending guide member may be in the shape of a winding case or in the form of a pipe, and either of these can be slidably inserted into the carbon fiber rod as long as it is within the above-mentioned limits. can.

A specific embodiment of the present invention will be described as shown in the attached drawings. In other words, FIG. By attaching part 2, it has the same appearance as the smallest diameter tube or rod in a normal telescopic antenna, but this rod-shaped member 1 is a single piece of material and is made of a large number of tubes assembled in a telescopic manner. are essentially different.

Further, a bent molded body 3 is attached to the lower end of this carbon fiber rod-shaped member 1.

As shown in the figure, this bent molded body 3 is bent within the above-mentioned limits, and in this way, the bent molded body 3 is attached to the lower end of the rod-shaped member 1 and that portion is bent. Therefore, the lower end of the rod-shaped member 1 always tries to restore its straight shape (even though the above-mentioned flexibility is recognized as a whole, this lower end shows much stronger straightness than steel). This is the same as the cut end of a wire or other general rod-shaped material) is bent and formed to fit into the bending guide part of the bending guide member 4 or 5 as shown in FIG. 2 or 3, and then pressed. At the time of winding, the lower end of the rod-like member 1 is not pressed strongly against the wall surface of the bending guide part, or during winding, it forms an appropriate engagement relationship with the circumferential surface of the winding rotary body 6 as shown in FIG. form a favorable relationship.

Furthermore, the opening 8 for the rod-like material 1 is generally formed in a straight line in order to accurately hold the extracted rod-like material 1 in a straight line. Even if the above-mentioned bent molded body 3 tries to enter the entrance/exit port 8 during the final process of extraction, it will not be able to pass through the linear entrance/exit port due to its bending formability, so that it is possible to achieve the function of preventing extraction. be.

In the case shown in FIG. 2, a circular rotary disk 6 fixed to a rotary shaft 7 is rotatably provided to further provide a winding action to the case-shaped bending guide member 4 having a circular inner cavity 4a.
Therefore, winding is attempted by rotating this rotating shaft γ with a motor, etc., but in the case where the rod-shaped material 1 is expanded and contracted simply by manual or mechanical pushing method, such a method is not possible. There is no need for the rotary disk 6 or the rotary shaft 7, and it is sufficient to simply form the circular inner cavity 4a.

It is clear that the circular lumen surface 4a is itself a bending guide surface for the force S in this embodiment.

FIG. 3 shows a mode in which the present invention is implemented as an on-vehicle antenna, in which a bending guide member 5 is shown relative to a vehicle body 10.
In other words, one end of the tubular bending guide member 5 is attached at right angles to the vehicle body plate 10a to form a linear outlet 8. is appropriately bent and set inside the vehicle body, and the above-mentioned carbon fiber rod-shaped member 1 is inserted into such a bending guide member 5 and is slidably assembled, as in the case of Fig. 2 described above. It is similar to

That is, in a conventional multi-tube antenna, an antenna base tube of at least a length sufficient to accommodate each antenna element made of the tube material is protruded into the vehicle body 10 in a straight line along the direction of expansion and contraction of the antenna. It was necessary to expand and contract each antenna element within the shaped antenna base cylinder, but in the present invention, the bent tubular guide member 5 can be simply bent and set as shown in the figure. The carbon fiber rod-like material 1 is bent within the above-mentioned limits, for example, the car body plate 1.
The antenna can be extended in a direction along the inner surface of the antenna or in a direction that avoids equipment installed in the vehicle, and it is possible to significantly simplify not only the structure of this type of vehicle-mounted telescopic antenna but also the mounting structure attached to it. Furthermore, there is no problem with the design of equipment and other parts of the vehicle body.

It is clear that the device can be installed at any other location on the vehicle body, as well as at the fender.

It goes without saying that in the case shown in FIG. 2 described above, the bending guide member 4C having the circular inner cavity 4a may be rotatably mounted in the case 10 by its shaft 11, as shown in FIG. By forming the thickness of the circular inner cavity 4a to be sufficiently larger than the diameter of the carbon fiber rod-like material 1 as shown in FIG. As shown in the figure, the rod-shaped members 1 having a considerably long length can be stored in the compact case-shaped circular inner cavity 4a. It can be stored without causing any unreasonableness.

According to the present invention, even if the diameter of the carbon fiber rod 1 is 3 am or more, by bending it within the above-mentioned bending limit, a preferable telescoping antenna mechanism can be obtained experimentally without any trouble. be able to.

The use of such a rod-shaped member 1 having a diameter of 3 mm or more is advantageous in obtaining a relatively long telescopic antenna. The ability to obtain a telescoping antenna with a flexible antenna is due to the excellent linear restorability and light weight of the carbon fiber material 1 (
The specific gravity is 1 or less).

However, if the telescopic antenna of the present invention is applied to, for example, a portable device and needs to be stored in a particularly compact storage section, the carbon fiber rod-like material 1 may have a diameter of 2 mmJJ or less. In particular, those with a value of 0.5 to 1.5 are adopted.

Carbon fiber rod-like material 1 with a reduced diameter has not existed on the market in the past, but it is possible to reduce the diameter by processing a general large-diameter rod-like material, or when passing through a die in the manufacturing process. It can be produced satisfactorily by making appropriate improvements to the relative relationships such as resistance and tensile force or viscosity of the binder, and uses carbon fiber rod-shaped materials whose diameter has been reduced in this way. As a result, the distance between the neutral axis and the curved surface when the rod-like material is bent is naturally reduced, making it possible to bend the rod to a small diameter within the above-mentioned bending restrictions, thereby providing a compact antenna mechanism.

For example, in the case of a rod-shaped material with a diameter of about 1.0, the bending radius that takes into account the safety factor is 451nrIL, and a winding frame or circular bore with a diameter of 10cra or less is sufficient, so it can be used as an antenna for a portable receiver. This means that it can be fully adopted.

If it is a rod-like material with a diameter of 0.6 mm, the bending radius considering the safety factor is 27 mm, which means that a case with a diameter of 5 cm/n is generally sufficient, which is sufficient for the miniaturized receiver at the time of pick-up. Applicable.

Note that it is extremely difficult to manufacture rod-shaped materials with a diameter of less than 0.5 mm, and when used as an antenna, there is an extremely high possibility that they will get caught on other objects and break.

According to the present invention as explained above, since a telescopic antenna can be obtained using a single carbon fiber rod-like material 1, it is not necessary to connect it with a large number of pipe materials having different diameters as in the conventional method. Almost no processing is required for each bullet piece and its attachment and connection, which naturally makes it possible to make the telescopic antenna extremely easily and mass-produced, and also makes it possible to make the electrical It is clear that this invention is industrially highly effective, as stable antenna function can be expected without requiring any modification regarding power supply conduction.

In addition, by adopting a tubular body as the bending guide member, the contracted rod-like material can be guided in any direction of the applicable equipment, and it does not become straight on the extension line in the direction of expansion and contraction, as in conventional telescoping antennas. This eliminates the need for an antenna base tube that does not require any additional features, which naturally makes the design of the applicable mounting equipment significantly easier.

Furthermore, by using a bending guide member with a circular inner cavity, it can be carried out in a relatively compact case by any method such as a manual telescopic operation type, a winding drum type, or an automatic feeding/feeding type using a feed roller or the like. It is possible to store the shrunken rod-shaped members in an orderly manner and to enable smooth insertion and removal operations.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, in which Fig. 1 is a partially omitted side view of the antenna member according to the invention in its normal state, and Fig. 2 is a state in which the antenna member is assembled into a bending guide member having a circular inner cavity. FIG. 3 is an explanatory diagram showing an example of the installation relationship of the attached device assembled to the bending guide member, which is a tubular body, and FIG. 4 is a side view of the same type as shown in FIG. FIG. 7 is a partially cutaway side view of a modified example. However, in these drawings, 1 is a carbon fiber rod-shaped member, and 3 is a carbon fiber rod-shaped member.
Reference numeral 4 indicates a bending molded body, 4 a bending guide member having a circular inner cavity 4a, 5 a bending guide member which is a tubular body, and 8 an entrance/exit.

Claims (1)

[Scope of Claims] 1. Bending the proximal end of a carbon fiber rod-like material formed by bonding and molding carbon fibers into a rod shape with a binder, having a bending radius that is 30 times or more the diameter of the carbon fiber rod-like material. 1. A telescoping antenna device, characterized in that the carbon fiber rod-like material is inserted into a guide member and is slidably assembled to the bent guide member. 2. Mounting the proximal end of a carbon fiber rod-shaped material formed by binding carbon fibers into a rod shape with a binder to a tubular bending guide member having a bending radius that is 30 times or more the diameter of the carbon fiber rod-shaped material. the bending guide member is mounted inside a base body such as a car body, the open end is exposed outside the base body, and the carbon fiber rod-like member is slidably assembled to the bending guide member. The telescopic antenna device according to item 1. 3. Insert the proximal end side of a carbon fiber rod-like material formed by bonding and molding carbon fibers into a rod shape with a binder into a bending guide member having a circular inner cavity, and wind up the carbon fiber rod-like material into a case shape. The telescopic antenna device according to claim 1, wherein the telescopic antenna device is slidably assembled to the bending guide member. 4. Claims 1 to 3, in which a bending molded body is attached to the proximal end side of the carbon fiber rod-shaped material and inserted into a bending guide member, and a linear lead-out portion is formed in the bending guide member. The telescoping antenna device according to any one of paragraphs. 5. The thickness of the circular inner cavity is smaller than the diameter of the carbon fiber rod-like material, and a bending guide member is rotatably provided in which a plurality of rows of the carbon fiber rod-like material are wound in parallel. 3
The telescopic antenna device described in . 6. The telescopic antenna device according to any one of claims 1 to 5, which uses a carbon fiber rod-like material having a diameter of 2 mtrdJ or less, particularly 0.5 to 1.5 mm.