JP2003037408A - Multi-stage accommodation type flexible antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multi-stage accommodation type flexible antenna, in which tensile strength in a first element where dense winding coil is provided inside is improved. SOLUTION: The multi-stage accommodation type antenna comprises first and second elements 30 and 31. The first element 30 comprises a long and cylindrical mold stopper 33 that is arranged in a case, while being accommodated freely, and a densely wound coil 32 that is provided in close contact with the inside of the mold stopper 33. The second element 1 is incorporated into the first element 30 while being slid freely. The mold stopper 33 covers an entire circumference including the tip portion of the densely wound coil 32 for avoiding expansion, and at the same time a multi-stage section 38 where thickness in the tip site is increased so that the second element 31 does not come out is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multistage storage type flexible antenna which is used for a mobile phone, a mobile radio device or the like and which is extended and stored in multiple stages.

[0002]

2. Description of the Related Art Conventionally, as a flexible antenna which has been used in a mobile phone or the like and which is extended and stored in multiple stages,
For example, a telescopic flexible antenna having a configuration disclosed in Japanese Patent Laid-Open No. 7-273519 is known as a conventional example.

This telescopic flexible antenna is shown in FIG.
Further, as shown in FIG. 6, a first element 3 which is formed in a long tubular shape, is inserted through the holder 1 and is housed inside the housing 2, and is arranged to be retractable, and the first element. Second element 4 which is slidably inserted inside 3 and is elongated, a joint mold 5 provided at the end of the second element 4, and a cap provided at the tip of the joint mold 5. The first element 3 and the second element 4 are extended and stored in two stages.

As shown in FIGS. 7 to 9, the first element 3 includes a close-wound coil 7 formed by winding a thin plate wire in a spiral shape to form a thin tube, and an outer periphery of the close-wound coil 7. And a covering tube 8 made of a synthetic resin for covering the surface.
By using the close-wound coil 7 and the covering tube 8 in this manner, the first element 3 has flexible flexibility as shown in FIG.

A base end portion 9 of the close-wound coil 7 is formed so as to extend from a rear end 10 of the covering tube 8, and a stopper member 11 is provided between the base end portion 9 and the rear end 10 of the covering tube 8.
Is firmly fixed by a predetermined means such as caulking.

The stopper member 11 is formed in a substantially cylindrical shape, has a through hole 12 in the center, and has a thick portion 14 on the rear end side with a step 13 interposed. Further, the step portion 15 on the inner peripheral surface thereof
The base end portion 9 of the close-wound coil 7 is in contact with the rear end 10 of the cover tube 8 and the step portion 47 on the front end side of the step portion 15 holds the rear end 10 of the covering tube 8.

The tip portion 16 of the tightly wound coil 7 is formed so as to extend from the tip 17 of the covering tube 8, and a holding metal fitting 18 is attached to the tip portion 16 and the tip 17 of the covering tube 8.

The holding metal fitting 18 has a through hole 19 in the center and a thick portion 20 is formed on the tip end side, and the tip end portion 16 of the close-wound coil 7 contacts the step portion 21 on the inner peripheral surface. Step 4 on the rear end side of the step portion 21.
8 holds the tip 17 of the covering tube 8.

A wire 22 made of a flexible metal wire is provided in the center of the second element 4, and the outer peripheral surface of the wire 22 is covered with a resin pipe 23. The base portion 24 of the wire 22 is formed so as to extend from the end portion 25 of the resin pipe 23, and the contact spring member 26 is disposed on the base portion 24.

The contact spring material 26 has a close-wound coil 7 at one end.
A spacer member 27 having a height abutting on the inner peripheral surface of the is attached, and a caulking metal fitting 28 is attached to the other end by caulking means. Further, the contact spring material 26
The central portion 29 of the is bulged outward, and the central portion 2
Electrical connection is achieved by sliding 9 in contact with the inner peripheral surface of the close-wound coil 7.

In the first element 3 and the second element 4 having such a configuration, when the second element 4 is extended, the spacer member 27 of the contact spring member 26 is provided with the step portion 21 of the holding metal fitting 18. It comes into contact with and plays the role of retaining.

[0012]

In the telescopic flexible antenna of this conventional example, when a static load is applied in the extending direction of the element as shown in FIG. 11, all of the close-wound coils 7 of the first element 3 are closed. It will be a burden. Therefore, when a force equal to or greater than the spring limit value is applied to the close-wound coil 7, the coil extends to an unrecoverable state, and the resonance point is displaced, which adversely affects the electrical characteristics.
Since the covering tube 8 covering the close-wound coil 7 is thin, it extends together with the close-wound coil 7.

Therefore, in the case of the conventional example,
There is a problem to be solved in improving the tensile strength of the first element 3 when the second element 4 is in the extended state.

[0014]

As a concrete means for solving the above-mentioned problems of the prior art, the present invention is directed to a mold stopper which is arranged in a housing so as to be accommodated therein and is formed in a long tubular shape, and a mold stopper of the mold stopper. The mold stopper includes a first element including a close-wound coil arranged in a state of being closely contacted with the inside, and a second element slidably incorporated in the first element. While covering the entire circumference including the tip of the coil to prevent extension,
The present invention provides a multi-stage retractable flexible antenna characterized in that a stepped portion having a thickened wall is provided at a tip end portion thereof so that the second element does not come out.

The mold stopper is made of a flexible synthetic resin material, and the rear end of the close-wound coil has a base end portion of the mold stopper. The contact member for electrical connection to the stopper member to be attached is provided.

In the multi-stage storage type flexible antenna according to the present invention, when a static load is applied in the extension direction of the element, no load is applied to the closely wound coil due to the presence of the mold stopper. That is, the tensile strength of the first element is improved, and the problem that the close-wound coil is stretched unlike the conventional example does not occur. Further, since the covering tube and the holding metal fitting used in the configuration of the conventional example are not required, the number of parts can be reduced and the cost can be reduced.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings. For ease of understanding, the portions corresponding to the conventional example will be described with the same reference numerals as in the conventional example.

First, in FIGS. 1 to 3, reference numeral 30 denotes a first element of a multi-stage retractable flexible antenna, and the first element 30 is housed inside a casing (not shown) and is arranged so as to be retractable. And this first
The second element 31 is slidably inserted into the element 30 of FIG.

The first element 30 is a close-wound coil 32 in which a thin plate wire is spirally wound to form a thin cylinder.
And a mold stopper 33 which is mounted on the outside of the close-wound coil 32 and prevents expansion of the close-wound coil.

The close-wound coil 32 is formed in a further thin tubular shape by using a plate-like wire material that is thinner than the close-wound coil 7 described in the conventional example. In addition, the base end portion 3 of the close-wound coil 32
4 is formed to extend from the rear end 35 of the mold stopper 33, and the extended base end portion 34 is provided with a contact metal fitting 36 for electrical connection with a stopper member 41 described later. ing.

The mold stopper 33 is made of a flexible synthetic resin material and formed into a substantially cylindrical shape. The mold stopper 33 has a through hole in the center thereof, a thick portion 37 is formed on the front end side, and an inner peripheral surface. The tip portion 39 of the close-wound coil 32 is brought into contact with and held by the step portion 38. At the rear end 35 of the mold stopper 33, the contact fitting 36 is located and a stopper member 41 is attached.

The stopper member 41 is formed in a substantially cylindrical shape, has a through hole 42 in the center thereof, and has a thick portion 46 on the rear end side with a step 45 interposed. Further, the step portion 43 on the inner peripheral surface thereof
Engages with the step portion 44 of the mold stopper 33.

The second element 31 is provided with a wire 22 made of a flexible metal wire at the center.
A resin pipe 23 covers the outer peripheral surface of the wire 22. The base portion 24 of the wire 22 is formed so as to extend from the end portion 25 of the resin pipe 23, and the contact spring member 26 is disposed on the base portion 24.

The contact spring member 26 has a close-wound coil 3 at one end.
A spacer member 27 having a height abutting on the inner peripheral surface of 2 is attached, and a caulking metal fitting 28 is attached to the other end by caulking means. Further, the contact spring material 2
The central portion 29 of 6 bulges outward, and the central portion 29 slides in a state of contacting the inner peripheral surface of the close-wound coil 32 to achieve electrical connection.

The first element 30 and the second element 31 having such a structure have the contact spring member 26 when the second element 31 is extended as shown in FIG.
The spacer member 27 comes into contact with the step portion 38 of the mold stopper 33 and is prevented from coming off.

As described above, in the first element 30 of the multi-stage storage type flexible antenna, the mold stopper 33, which functions to prevent the expansion of the close-wound coil 32 and protect it, is provided outside the close-wound coil 32. Since it exists in the state of being covered, no load is applied to the close-wound coil 32 when the element is extended in the extension direction. Therefore, the close-wound coil 32 does not inadvertently extend, and can be formed into a thin tubular shape with a plate wire material thinner than in the case of the conventional example. Further, since the covering tube and the holding metal fitting used in the configuration of the conventional example are not required, the number of parts can be reduced and the cost can be reduced.

[0027]

As described above, the multistage retractable flexible antenna according to the present invention is provided with a mold stopper on the outside of the close-wound coil to prevent the close-wound coil from extending, so that the element can be extended in the extending direction of the element. The tightly wound coil is not loaded when a static load is applied. That is, the excellent effect that the tensile strength of the first element is improved and the problem such as the expansion of the close-wound coil unlike the conventional example does not occur.

Since the mold stopper is formed of a flexible synthetic resin material, it is possible to maintain the flexible bendability of the first element as in the case of the conventional example. Play.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a second element inserted in a first element of a multi-stage retractable flexible antenna according to the present invention.

FIG. 2 is an enlarged cross-sectional view around the tip side of the mold stopper of FIG.

FIG. 3 is an enlarged cross-sectional view around the stopper member of FIG.

FIG. 4 is an enlarged cross-sectional view illustrating a state in which the spacer member comes into contact with the step portion when the second element is extended.

FIG. 5 is a front view showing a state where the antenna of the mobile phone according to the conventional example is housed.

FIG. 6 is a front view showing a state where the antenna of the mobile phone according to the conventional example is extended.

FIG. 7 is a cross-sectional view showing a second element inserted into a first element of a telescopic flexible antenna according to a conventional example.

FIG. 8 is an enlarged cross-sectional view around the holding metal fitting of FIG.

9 is an enlarged cross-sectional view around the stopper member of FIG.

FIG. 10 is a front view illustrating a flexible bendability of an antenna of a mobile phone according to a conventional example.

FIG. 11 is a front view illustrating a state in which a static load is applied in the extending direction of the antenna of the mobile phone according to the conventional example.

[Explanation of symbols]

1 holder, 2 housing, 3 first element,
4 second element, 5 joint mold,
6 cap part, 7 close-wound coil, 8 coating tube, 9 base end part, 10 rear end, 11 stopper member, 12 through hole, 13 step part, 14 thick part,
15 step, 16 tip, 17 tip, 18
Holding metal fittings, 19 through holes, 20 thick parts, 21 step parts, 22 wires, 23 resin pipes, 24
Base portion, 25 end portion, 26 contact spring material, 27 spacer member, 28 caulking metal fitting, 29 central portion,
30 first element, 31 second element,
32 close-wound coil, 33 mold stopper, 3
4 base end part, 35 rear end, 36 contact metal fittings, 37
Thick part, 38 step part, 39 tip part, 41 stopper member, 42 through hole, 43 step part, 44
Step portion, 45 step portion, 46 thick portion, 47 step portion, 48 step portion.

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 5J046 AA01 AA02 AA10 AB06 JA12                 5J047 AA01 AA02 AA10 AB06 FA09                       FD01

Claims (3)

[Claims] 1. A first element comprising a mold stopper which is disposed in a housing so as to be accommodated in a housing and is formed in a long tubular shape, and a close-wound coil which is disposed in close contact with the inside of the mold stopper. And a second element slidably incorporated in the first element, wherein the mold stopper covers the entire circumference including the tip portion of the close-wound coil to prevent extension, and the second stopper The multi-stage retractable flexible antenna is characterized in that a step is formed in which the thickness of the tip portion is thickened so that the element of (3) does not come out. 2. The mold stopper is formed of a flexible synthetic resin material.
The multi-stage retractable flexible antenna described in. 3. A contact fitting for electrical connection with a stopper member attached to the base end of the mold stopper is provided at the rear end of the close-wound coil. Item 1. A multistage storage type flexible antenna according to item 1.