JPH0846421A - Core element wire for antenna - Google Patents

Abstract

PURPOSE:To provide a core element wire with high elasticity easily attachable to the cap and junction of an antenna for which bends and folding or the like do not occur and the end part of the core element wire of the antenna is easily worked by using the wire of a specified super-elastic alloy. CONSTITUTION:In the wire of an Ni-Ti based super-elastic alloy, at least one end is made of a soft material whose hardness is less than 280 by HV (Vickers hardness.) The large part excluding one end or both ends of this core element line for the antenna is made of the wire of the super-elastic alloy so as to prevent it from being bent or folded even when it collides with a surrounding object, when it is dropped or when it erroneously hits an arm or the like. The soft part 10 of the end part may be only for one end and may be for both ends. Also, a part other than the soft part 10 is a super-elastic part. The end part of the wire is made of the soft material so as to facilitate molding work for attachment with the cap and junction of the antenna.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a portable telephone,
The present invention relates to an antenna core wire that has super-elastic characteristics that prevent bending and breakage of antennas used in radio receivers, etc., and can be easily molded at the ends, and is easy to join with antenna parts. The present invention relates to an antenna core wire.

[0002]

2. Description of the Related Art A portable telephone, a radio receiver and the like use an antenna to perform reception and transmission. For example, referring to the portable telephone, FIG. A mobile phone (2) using the antenna (1) is shown, and FIG. 2 is an external view showing the structure of the antenna (1). At the end of the antenna (1), a cap (3) is attached to one end and a plug (5) is attached to the other end.
The antenna (1) is attached to the mobile phone (2) via a plug (5) or the like. During use, this portable telephone may hit an external object, or the antenna core wire (4) may be bent or broken by holding or swinging the antenna (1) by hand. Most of the material of the antenna core wire is a steel wire such as a piano wire, so that it is permanently deformed. The deformed wire is sometimes corrected, but when the plastically deformed one is returned to its original state, the part may be weakened in strength or broken.

As a solution to these problems, it has been proposed to use a wire made of a shape memory alloy for an antenna element (Japanese Utility Model Publication No. 59-29807). This proposal discloses to restore after bending. However, when using the mobile phone, the antenna bends,
It is not practically preferable because it takes a lot of time to restore the bend and it causes a trouble in the call. Further, even if a wire made of Ni-Ti type shape memory alloy is used, there is a problem in terms of manufacturing how to attach the cap and the plug as antenna parts.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been made as a result of studying the above-mentioned problems, and it is rich in elasticity and does not cause accidents such as bending and bending, and the end portion of the core wire of the antenna. The core wire for the antenna has been developed, which is easy to process and can be easily attached to the cap and connector that are the parts of the antenna.

[0005]

According to a first aspect of the present invention, there is provided a Ni-Ti superelastic alloy wire material having a hardness of at least one end of HV (Vickers hardness) of 280 or less. The core wire for an antenna is characterized in that the invention of claim 2 is characterized in that, in the invention of claim 1, the Ni-Ti superelastic alloy is Ni 50.6 to 52.0 at%,
The balance of the present invention is characterized by comprising the balance Ti. In the invention of claim 3, in the above-mentioned claim 1, the Ni-Ti-based superelastic alloy has a part of Ni 50.6-53.0 at% as C.
1 or 2 or more of r, V, Nb and Co in total of 10a
It is characterized by being replaced by t% or less and consisting of the balance Ti,

According to a fourth aspect of the present invention, there is provided an Ni-Ti-based superelastic alloy wire rod, wherein at least one end has a radial cross-sectional dimension larger than the original wire diameter dimension. A core wire for use, wherein the invention of claim 5 is the same as in claim 4, wherein the Ni-Ti based superelastic alloy is Ni5.
The invention of claim 6 is characterized in that the Ni-Ti-based superelastic alloy is Ni 50.6-5.
Part of 3.0 at% is replaced with one or more of Cr, V, Nb, and Co by a total of 10 at% or less, and the balance is made of Ti.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below. The core wire for an antenna according to the invention of claim 1 is Ni
A wire of a Ti-based superelastic alloy, which has a hardness of at least one end of HV (Vickers hardness) of 280 or less. Most of the core wire for antenna except one or both ends is made of super elastic alloy wire so that it does not bend or break even if it collides with surrounding objects, drops, or accidentally hits the arm etc. To do so. The Ni-Ti based superelastic alloy material has the property of returning to the original state when the load is removed even if a large strain of 8% is applied. The core wire for an antenna according to the present invention is a soft material in which at least one of both ends of the wire has a hardness of 280 or less in HV (Vickers hardness). FIG.
As shown in FIG. 7, the end soft part (10) may be only one end or both ends. The soft part (1
The parts other than 0) are superelastic parts (9). The reason why the end portion of the wire is made of a soft material is to facilitate the molding process for attaching the antenna cap (3) and the connector (5) as shown in FIG. That is, the antenna has a cap (3) at one end of the core wire (4) as shown in FIG.
Is assembled by attaching the connector (5) to the other end. This attachment is generally by welding, brazing, etc., but for NiTi alloys, this welding, brazing is
Very difficult. Therefore, in the present invention, the end portion of the core wire for an antenna is formed into a predetermined shape by crushing it from the side surface of the wire, and the dimension of the wire cross section is made slightly larger than the original cross section size. The plug (5) is mechanically attached to these parts by being press-fitted into the hole (a size slightly smaller than the size of the molded wire).

Further, when the end portion is formed into a predetermined shape, the Ni-Ti-based superelastic alloy material has a problem that cracks are generated. In the present invention, the hardness of the end portion of the core wire for antenna is Is a soft material having an HV (Vickers hardness) of 280 or less. The Ni-Ti-based superelastic alloy material usually has a hardness of about 420 at HV, but H at the end
The reason why V is set to 280 or less is that if it exceeds 280, cracks are generated in the molding process. The preferred range is HV260 or less. Further, the softening treatment of the end portion can be stably achieved by energizing or inductively heating the end portion, heating with a burner, or the like.

The invention of claim 2 is the preferred embodiment of the Ni-Ti based superelastic alloy according to claim 1, wherein N
i50.6-52.0 at% and the balance Ti. This alloy has a transformation point of around 20 ° C. and exhibits excellent superelastic properties near room temperature. The invention of claim 3 is another preferred embodiment of the Ni-Ti based superelastic alloy according to claim 1, wherein Ni50.6-53.0a.
One part or two or more kinds of Cr, V, Nb, and Co are replaced with a total of 10 at% or less at a part of t% to make an alloy composed of the balance Ti. These substituting elements have the effect of lowering the transformation point of the superelastic alloy, and exhibit excellent superelastic properties even at low temperatures of -10 ° C to -20 ° C. Therefore, these alloys can be used over a wide range from −20 ° C. to room temperature. The total amount of the substituting elements is set to 10 at% or less in the above, since workability deteriorates if the content exceeds 10 at%.

The invention of claim 4 of the present application is a wire rod of a Ni-Ti based superelastic alloy, characterized in that the radial cross-sectional dimension of at least one end is made larger than the original wire diameter dimension. It is a core wire for an antenna. The reason why the radial cross-sectional dimension of at least one of the two ends of the core wire is larger than the original wire diameter is that this part is press-fitted into the inner diameter of the cap or connector that is a part of the antenna. This is for mechanically connecting the two. In this case, there may be both ends or only one end. This coupling method is economical and extremely easy. The processing of this end portion can be performed by crushing (compressing) from the side surface of the line as shown in FIG. In this case, as shown in FIGS. 3 and 4, it is preferable that the dimension (H ₀ ) expanded in the radial direction of the wire is about 0.1 mm larger than the inner diameters (d ₀ ) of the cap and the plug.
The crushing amount at this time is 30 to 50 of the wire diameter.
%. When the end portion is crushed, the outermost portion (7) is slightly left as it is as shown in FIG. 4 (for example, 1 to
2 mm), preferably crushing the inside. This is because it is easy to insert the crushed end into the inner diameter of a plug or the like when press-fitting.

The invention of claim 5 is based on the invention of claim 4, wherein the Ni--Ti based superelastic alloy is Ni 50.6-5.
2.0 at% and the balance Ti, which is a preferable embodiment of the material. Further, in the invention of claim 6, in the above-mentioned claim 4, the Ni—Ti-based superelastic alloy is Ni50.6.
Part of 53.0 at% is replaced with one or more of Cr, V, Nb and Co by a total of 10 at% or less, and the balance T
i, which is another preferred material embodiment.

[0012]

Next, an embodiment of the present invention will be described. [Example-1] As an antenna core wire (4) shown in Fig. 2, a diameter of 1.3 made of Ni50.8 at% -Ti alloy was used.
A super elastic material having a length of 200 mm and a length of 200 mm was prepared. This material was heat-treated at 450 ° C after 35% cold working. The transformation point was about 20 ° C and the hardness was HV (Vickers hardness).
Was about 410 at room temperature. One end of the wire having a length of 200 mm, 6 mm, was heated by energization to obtain HV260 at room temperature. Next, as shown in FIG. 4, the softened end is crushed (compressed) by 40% of the wire diameter from the side of the wire about 3 mm inside of 1.5 mm from the end to obtain the initial cross-sectional dimension (wire diameter). The thickness of the crushed portion (6) was changed from 1.3 mm to 0.78 mm. The radial expansion dimension (H ₀ ) was 1.45 mm. This radial expansion dimension 1.4
5 mm is the inner diameter d ₀ (1.35 m) of the connector (5) in FIG.
m) is 0.1 mm larger. By the above-mentioned crushing process of the end portion, the material could be favorably molded without the occurrence of cracks. The end of the antenna core wire thus processed is used as the inner diameter d of the plug (5) of FIG.
_When press-fitting into ₀ (1.35 mm), both were able to bond well. The above-mentioned antenna core wire manufactured in this manner was immediately restored to its original shape even when largely bent at 25 ° C., and the effect of superelasticity was also confirmed.

[Embodiment 2] As an antenna core wire (4) shown in FIG. 2, Ni 49.8 at% -Cr 1.0 at%
A superelastic material made of a Ti alloy and having a diameter of 1.3 mm and a length of 200 mm was prepared. This material was heat-treated at 430 ° C after 35% cold working and had a transformation point of about -25 ° C.
The hardness HV (Vickers hardness) was about 430 at room temperature. Both ends of the wire having a length of 200 mm were heated in the same manner as in Example 1 to have an HV of about 260 at room temperature. Next, in the same manner as in Example-1, as shown in FIG.
A crushing process (compression process) of 40% of the wire diameter dimension was performed from the line side surface about 3 mm inside the 1.5 mm from the end, and the thickness of the crushed portion (6) from the initial cross-sectional dimension (wire diameter) of 1.3 mm was 0. It was set to 78 mm. The radial expansion dimension (H ₀ ) was 1.45 mm. This radial expansion dimension 1.4
5 mm is the inner diameter d ₀ (1.35 m) of the connector (5) in FIG.
m) and the inner diameter of the cap (1.35 mm) is 0.1 m
It has a large size. By the above-mentioned crushing process of the end portion, the material could be favorably molded without the occurrence of cracks. The antenna core wire end-processed in this way was press-fitted into the inner diameter d ₀ (1.35 mm) of the connector (5) and the inner diameter (1.35 mm) of the cap of FIG.
The antenna wires, plugs and caps could be mechanically joined very well. The antenna thus manufactured was immediately restored to its original shape even when largely bent at 5 ° C., and a superelastic effect was confirmed.

[0014]

As described above, the core wire for an antenna according to the present invention prevents bending or breakage of the antenna when it is used in a portable telephone or the like, and when the antenna is assembled, its parts are used. It has an industrially remarkable effect such that the processing of the joint portion with a certain cap or plug is easy, and the joint is mechanical, so that it can be economically and easily performed.

[Brief description of drawings]

FIG. 1 is an external perspective view showing a usage state of an antenna in a general mobile phone.

FIG. 2 is an external view showing a configuration of an antenna.

FIG. 3 is a sectional view of a connector (5) which is the antenna component of FIG.

4A and 4B show a shape of a crushed portion of an end portion of an antenna core wire according to the present invention, wherein FIG. 4A is a plan view, FIG. 4B is a sectional view taken along line AA of FIG. 4A, and FIG. FIG. 7B is a sectional view taken along line BB of FIG.

FIG. 5 is a cross-sectional view showing a state in which a crushed portion of an end portion of an antenna core element is press-fitted into a connector.

FIG. 6 is an explanatory view showing a softened portion at one end of the core wire for an antenna according to the present invention.

FIG. 7 is an explanatory view showing softened portions at both ends of the core wire for an antenna according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antenna 2 Mobile phone 3 Cap 4 Antenna core wire 5 Plug 6 Antenna core wire end crushing part 7 End part crushing left part 8 Press fit part 9 Antenna core wire super elastic part 10 Antenna End softening part of core wire

Claims (6)

[Claims] 1. A wire material of a Ni—Ti based superelastic alloy, wherein at least one end has a hardness of HV (Vickers hardness).
The core wire for antennas characterized by using a soft material of 280 or less 2. The Ni—Ti superelastic alloy is Ni5
The core wire for an antenna according to claim 1, characterized in that it comprises 0.6 to 52.0 at% and the balance Ti. 3. The Ni—Ti based superelastic alloy is Ni5
0.6 to 53.0 at% of a part of Cr, V, Nb, Co
Substituting one or more of the above with a total of 10 at% or less,
The core wire for an antenna according to claim 1, wherein the remaining portion is made of Ti. 4. A core wire for an antenna, which is a wire material of a Ni—Ti based superelastic alloy, wherein a radial cross-sectional dimension of at least one end is larger than an original wire diameter dimension. 5. The Ni—Ti-based superelastic alloy is Ni5
The core wire for an antenna according to claim 4, wherein the core wire comprises 0.6 to 52.0 at% and the balance is Ti. 6. The Ni—Ti-based superelastic alloy is Ni5
0.6 to 53.0 at% of a part of Cr, V, Nb, Co
Substituting one or more of the above with a total of 10 at% or less,
The core wire for an antenna according to claim 4, characterized in that it comprises the balance Ti.