JP2002374113A - Antenna and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna having a simple arrangement capable of decreasing the number of components and the number of control steps in a cascade antenna for use in a portable radio communication device, etc., typified by a portable telephone. SOLUTION: In a cascade antenna, abutting tongue parts 24, 25 as an abutment functional parts are formed at upper and lower ends of an internal spring 23, mounted to a lower part of a conductive metal line 22A as a first step straight element 22 which is inserted into a second step coil part 7, and the downward abutting tongue part 25 is abutted on a first holding part 22C which is formed integrally with the straight element 22. Further, with this arrangement, when the antenna is stretched, the abutting tongue part 24, formed at an upper end of the internal spring 23, is abutted on an upper stopper 10 which is secured to the upper part of the coil part 7, and the number of components and the man-hours for the management steps are reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna used for a portable radio communication device represented by a portable telephone or a portable information terminal device represented by a PDA, and a method of manufacturing the same.

[0002]

2. Description of the Related Art In recent years, portable wireless communication devices such as mobile phones have become widespread, and these communication devices are usually provided with an antenna for transmitting and receiving a call and information on the location of the device. .

As the antenna, a multi-stage telescopic whip type antenna which can be stored in a housing when the portable device is not used has been favorably used.

[0004] Such a conventional whip-type antenna will be described below with reference to the drawings.

FIG. 13 is a cross-sectional view showing a state in which a conventional whip-type antenna is extended, FIG. 14 is a partially enlarged cross-sectional view of a whip portion which is the main part thereof, and FIG. It is sectional drawing which shows the state accommodated in the housing | casing of the apparatus.

In FIG. 1, reference numeral 1 denotes a first antenna element formed in a helical coil shape, and a periphery of the first antenna element 1 is covered with a resin to form a top portion 2.

[0007] The top part 2 has a lower part,
It has a cylindrical power supply fitting 3 made of conductive metal and electrically connected to one end of the first antenna element 1.

A whip portion 5 is coaxially connected and fixed below the top portion 2 via a joint portion 4 made of an insulating resin.

In the whip portion 5, a flexible linear element 6 in which an intermediate portion of a conductive metal wire 6A is covered with a first tube 6B is a first-stage portion.
The top portion 2 including the power supply fitting 3 and the whip portion 5 are arranged in an insulated state by the joint portion 4 by being fixed by the joint portion 4 including the upper portions of the A and the first tube 6B.

The second stage of the whip 5 is
It comprises a coil portion 7 formed by spirally winding a substantially oval band-shaped body in cross section and a second tube 8 covering the outer periphery of an intermediate portion of the coil portion 7.

Reference numeral 10 denotes a step formed by a small-diameter circular hole 9B through which the linear element 6 can be inserted and a large-diameter circular hole 9C below by the middle step 9A formed flat. A cylindrical upper stopper having a central hole 9 made of metal. The upper portion of the coil portion 7 is inserted from below into the large-diameter circular hole 9C so that the two are electrically connected to each other. 7 is fixed to the upper part.

At this time, the linear element 6 as the first stage is:
The lower part where the conductive metal wire 6A is exposed is the upper stopper 10
Is inserted into the hole 7A of the second-stage coil portion 7 through the small-diameter circular hole 9B, and the second-stage coil portion 7 has an upper position with a step of the upper stopper 10. The upper end of the second tube 8 is positioned by the upper stopper 10 while being regulated by the intermediate step 9A of the central hole 9.

A ring-shaped metal caulking member 11 is fixed to the lowermost end of the conductive metal wire 6A of the linear element 6 inserted into the hole 7A of the coil portion 7 and the metal caulking member is fixed. An inner spring 12 made of a conductive elastic metal is attached to a portion of the conductive metal wire 6 </ b> A above the position 11.

The inner spring 12 has an arcuate portion 12 having upper and lower cylindrical portions 12A and 12B inserted through the conductive metal wire 6A and projecting outward in the middle.
C resiliently contacts the inner wall of the coil portion 7, and the linear element 6 and the coil portion 7 are electrically connected via the inner spring 12.

Further, a spacer 13 having a diameter slightly larger than the diameter of the first tube 6B and the cylindrical portion 12A above the inner spring 12 is inserted into the position of the linear element 6 which is the upper position of the inner spring 12. The inner spring 12
The upper and lower cylindrical portions 12A and 12B are
The positioning in the up-down direction is performed by being regulated by the metal caulking member 11.

The spacer 13 positions the lower end of the first tube 6B, and is attached to the intermediate step 9A when the linear element 6 arranged so as to be accommodated in the coil 7 is extended. The outer peripheral portion of the upper surface comes into contact with the linear element 6 and is attached to regulate the upper position of the linear element 6 at the time of extension.

On the other hand, reference numeral 14 denotes a lower stopper having an upper opening 15 and a lower portion of the coil 7 is inserted into the upper opening 15 and is fixed to the coil 7 in a conductive state.

The lower stopper 14 regulates the lower position of the coil portion 7 on the bottom surface and also positions the lower portion of the second tube 8.

The whip portion 5 configured as described above is arranged so as to be freely housed in a hole 16A of a cylindrical metal holder 16, and the power supply fitting 3 or the power supply fitting 3 is provided in the hole 16A. An outer spring 17 capable of holding the outer peripheral surface of the lower stopper 14 is provided.

As described above, the conventional two-stage whip-type antenna is constituted, and this antenna is mechanically and electrically driven by fixing the holder 16 to the housing 18 of the portable telephone used as the equipment. It is attached to a mobile phone (see FIG. 15).

When the whip portion 5 of the antenna is extended, for example, when making a call using the mobile phone, the linear element 6 and the coil portion 7 which are conducted through the inner spring 12 are connected to the housing. It is pulled out coaxially from inside the body 18 and the outer periphery of the lower stopper 14 is
(See FIG. 13).

At this time, in the linear element 6 in the first stage of the whip portion 5, the outer peripheral portion of the upper surface of the spacer 13 has the upper stopper 1
0 is pulled out to a predetermined position in contact with the intermediate step 9A,
The second-stage coil portion 7 is also pulled out until the lower-end large-diameter portion 14A of the lower stopper 14 contacts the lower surface of the holder 16.

In this state, the whip unit 5 functions as an antenna, and the transmission / reception signals in the whip unit 5 are transmitted to an electric circuit (not shown) in the housing 18 via the lower stopper 14, the outer spring 17 and the holder 16. Is transmitted.

On the other hand, as shown in FIG. 15, when the whip portion 5 is stored in the housing 18 of the mobile phone used, the outer spring 17 elastically holds the outer peripheral portion of the power supply fitting 3. ing.

In this state, the first antenna element 1 of the top portion 2 functions as an antenna, and the transmitted / received signal is transmitted via the power supply fitting 3, the outer spring 17 and the holder 16 to the housing 1.
8 to the electrical circuit.

In any of the above states, the whip unit 5 is designed to transmit and receive the same transmission and reception frequency band.
And the effective line length of the first antenna element 1 of the top part 2 was matched to be substantially the same length.

[0027]

However, the above-mentioned conventional antenna has the spacer 13 mounted on the linear element 6.
And the metal caulking member 11 restricts the mounting position of the inner spring 12 in the vertical direction. If the position of the inner spring 12 changes, the effective line length of the antenna of the whip portion 5 changes, which also affects the antenna characteristics. Therefore, there is a problem that the management of the mounting state of the spacer 13 and the metal caulking member 11 cannot be simplified, and the material cost and the number of assembling steps are increased.

An object of the present invention is to solve such a conventional problem, and an object of the present invention is to provide an antenna having a simple configuration capable of reducing the number of components and the number of management steps, and a method of manufacturing the same.

[0029]

To achieve the above object, the present invention has the following arrangement.

According to a first aspect of the present invention, a top portion having a first antenna element and a power supply fitting electrically connected to the first antenna element is provided, and the top portion is connected via an insulating joint. The first member connected is
A whip portion as a second antenna element arranged in a conductive state in the second-stage coil portion, and a holder portion for holding the whip portion so as to be stably accommodated, wherein the whip portion,
The inner spring attached to the first-stage member was brought into conduction with the second-stage coil portion, and the lower end of the inner spring was integrally formed with the first-stage member. It is an antenna whose lower position is regulated by the locking portion, without mounting a metal caulking member or the like as a separate member on the first stage member, only mounting the inner spring, Since the lower position of the spring can be reliably regulated, the number of parts can be reduced, the number of assembling steps and the number of management steps can be reduced, and an inexpensive antenna can be easily realized.

According to a second aspect of the present invention, in the first aspect of the present invention, a top portion having a first antenna element and a power supply fitting electrically connected to the first antenna element is provided, and the top portion is insulated. A first-stage member connected via a joint portion, a whip portion as a second antenna element arranged in a conductive state in a second-stage coil portion, and a holder for holding the whip portion so as to be housed therein The whip portion is electrically connected to the second-stage coil portion by an inner spring mounted on the first-stage member, and the lower end of the inner spring is located above the coil portion. By contacting the fixed upper stopper, the upper position is regulated to prevent the first-stage member from falling off, and the first-stage member is a separate member such as a spacer. Wearing When the antenna is extended, the inner spring directly contacts the upper stopper to maintain the predetermined effective line length, so that the number of parts can be reduced, as well as the number of assembling steps and the number of man-hours for management can be reduced. It has the effect that it can be easily realized.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the contact function portion is integrally formed on both or one of the upper and lower ends of the inner spring. The part is configured to abut a locking part or an upper stopper integrally formed with the first stage member,
Because the contact function portion formed on the inner spring is brought into contact with another member, the inner spring comes into contact with the locking portion or the upper stopper in a more stable state when the antenna is extended,
Further, it has an effect that an antenna having stable antenna characteristics can be obtained.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the contact function portions formed at the upper and lower ends of the inner spring have the same shape, respectively, and the up and down direction of the inner spring is Therefore, the workability of assembling the inner spring can be significantly improved.

According to a fifth aspect of the present invention, in the third aspect of the present invention, the contact function portion of the inner spring is constituted by a contact tongue extending outwardly. With a simple configuration, the area in contact with other members can be increased, and an effect of obtaining stable antenna characteristics can be obtained.

According to a sixth aspect of the present invention, in the third aspect of the present invention, the abutting function portion of the inner spring is formed by an abutting convex portion formed to project outwardly including the end. The inner spring can be reinforced including the vicinity of the position where the contact protrusion is provided, and a stable antenna characteristic can be obtained. In addition, the contact protrusion is provided. Is provided so that the outer periphery of the first-stage member is equally divided at a predetermined angle, the force applied to the inner spring can be equalized, and the inclination of the first-stage member on which the inner spring is mounted is also reduced. Can be
This has the effect that the appearance can be improved when the antenna is extended.

According to a seventh aspect of the present invention, in the third aspect of the present invention, the contact function portion of the inner spring is constituted by an outer peripheral portion of an end portion having a material thickness larger than other portions. It is necessary to use materials having different material thicknesses as the material of the inner spring. However, since the shape of the inner spring can be a simple shape, it has the effect of greatly reducing the number of forming steps. .

According to an eighth aspect of the present invention, there is provided the method of manufacturing an antenna according to the first aspect, wherein a first step of processing the first-stage member to provide an integral locking portion, At least a second step of mounting the inner spring inserted member in which the lower position of the inner spring is regulated by the locking portion is attached to the first stage member, and the subsequent completion step
This is a method of manufacturing an antenna in which a coil portion, an upper stopper, a lower stopper, and the like are combined with the above-mentioned inner spring inserted member, and the inner spring can be efficiently mounted with a small number of parts, thereby improving the antenna production efficiency. By identifying the size and shape of the integral locking portion formed on the first-stage member, it is possible to determine a defect at this point, which is suitable for automatic production. Have.

According to a ninth aspect of the present invention, following the second step in the method of manufacturing an antenna according to the eighth aspect, the tube is inserted into the first-stage member from above with respect to the inner spring-inserted member. A third step of mounting the lower end of the tube in contact with the upper end of the inner spring, and crushing the position of the first-stage member projecting upward from the tube,
A fourth step of forming a tube-fixed member in which the position of the tube is regulated upward, and placing the tube-fixed member on the bottom of the lower stopper with respect to the coil portion to which the upper stopper and the lower stopper are fixed. A fifth step of forming a joint portion by molding an upper portion of the first-stage member projecting outward from the upper stopper with an insulating resin to be inserted through the provided hole portion. The manufacturing method, wherein the first-stage member is an in-process inner spring fixed member in which the tube is fixed at a predetermined position, and the coil portion is also obtained after the upper stopper and the lower stopper are fixed. Since both of them are combined, it is easy to handle any of the members, it is possible to obtain a high quality one with a small number of work steps, and if the productivity of the antenna is improved. Cormorant having an effect.

[0039]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

The same components as those described in the section of the related art are denoted by the same reference numerals, and detailed description will be omitted.

(Embodiment 1) Using Embodiment 1,
The invention according to claims 1 to 9 of the present invention will be described.

FIG. 1 is a sectional view showing a state where a whip type antenna according to an embodiment of the present invention is extended, and FIG.
3 is a partially enlarged cross-sectional view of a whip portion, which is a main part of the same, FIG. 3 is a cross-sectional view showing a state in which the antenna shown in FIG. 1 is housed in a housing of a device to be used, and FIG. 4 corresponds to a state of FIG. It is an external appearance perspective view.

As shown in the drawing, the top portion 2 has a helical coil-shaped first antenna element 1 enclosed and fixed in a resin whose outer shape is formed in a substantially cylindrical shape, and has a shell-like shape. At the lower part, a conductive metal-made cylindrical metal fitting 3 electrically connected to one end of the first antenna element 1 is mounted so as to protrude downward.

Then, on the same axis below the top part 2,
The whip portion 21 is connected and fixed to the top portion 2 in an insulated state via the joint portion 4 made of an insulating resin.

The first-stage portion of the whip portion 21 connected to the joint portion 4 is constituted by a flexible linear element 22 in which an intermediate portion of a conductive metal wire 22A is covered with a first tube 22B. I have.

The second-stage portion of the whip portion 21 covers the coil portion 7 formed by spirally winding a band-shaped body having a substantially oval cross section and an intermediate portion of the outer periphery of the coil portion 7. An upper stopper 10 and a lower stopper 30 are fixed to the upper and lower ends of the coil portion 7 in a conductive state with the coil portion 7.

The upper stopper 10 is provided with a stepped central hole 9.
The upper portion of the coil portion 7 is inserted into the large-diameter circular hole 9C below and fixed to the coil portion 7, and the upper position of the coil portion 7 is regulated by the intermediate step 9A of the stepped central hole 9.

The upper part of the second tube 8 is positioned by the upper stopper 10.

On the other hand, the lower stopper 30 is
The lower part of the coil part 7 is inserted into the OC and is fixed to the coil part 7, and the lower surface thereof regulates the lower position of the coil part 7.

The lower stopper 30 has a large diameter portion 30A at the bottom, and a through hole 30B having a diameter slightly larger than the inner diameter of the coil portion 7 at the center of the bottom surface.
Are provided concentrically.

The lower part of the second tube 8 is positioned by the lower stopper 30.

The linear element 22 at the first stage is
The lower part where the conductive metal wire 22A is exposed is the upper stopper 1
It is inserted and combined into a hole 7A of the second-stage coil portion 7 via a small-diameter circular hole 9B.

The linear element 22 is crushed at the lowermost end of the conductive metal wire 22A which is not covered by the first tube 22B located in the hole 7A of the coil portion 7 so as to integrally form the first latch. A part 22C is provided.

Reference numeral 23 denotes an arc-shaped portion 23A having an intermediate portion protruding outward at a plurality of locations, and cylindrical portions 23B, 23 formed on upper and lower portions of the arc-shaped portion 23A.
C is an inner spring attached to the conductive metal wire 22A by being inserted into the conductive metal wire 22A. In the above-mentioned mounted state, the lower end of the lower cylindrical portion 23C is connected to the first locking portion 22C.
And the lower position thereof is regulated, and the conductive metal wire 22
A is attached in an electrically connected state.

The inner spring 23 is formed so as to fit within a smaller diameter than the through hole 30B of the lower stopper 30 including the arc-shaped portion 23A when viewed from above.

The arc-shaped portion 23A of the inner spring 23
Is in elastic contact with the inner wall of the coil portion 7 in the above-mentioned mounted state,
The linear element 22 and the coil section 7 are electrically connected via the inner spring 23, and the linear element 22 is stopped at a predetermined position of the coil section 7 by the elastic contact force of the arcuate section 23A. ing.

Then, the cylindrical portion 23B of the inner spring 23,
As shown in the top view of FIG. 5 and the bottom view of FIG. 6, the upper and lower ends of the contact tongues 24 extend radially outward in a radial relationship with the central axes of the tubular parts 23B and 23C, respectively. ,
25 are provided at equal angle (120 °) intervals, and the inner spring 23 is formed in a symmetrical shape including no contact tongues 24 and 25 and having no direction in the vertical direction.

The contact tongues 24 and 25 serve as contact function parts for contacting other members. The structure is such that the parts constituting the cylindrical parts 23B and 23C are slightly extended. The plurality of locations are provided by bending the upper and lower surfaces sideward so that the upper and lower surface positions are substantially the same as the upper and lower end positions of each of the tubular portions 23B and 23C.

At this time, the dimensions of each of the contact tongues 24 and 25 are set such that the respective tips fit within the inner diameter portion of the hole 7A of the coil part 7.

The contact tongues 24, 25 may have a configuration in which the upper and lower ends of the cylindrical portions 23B, 23C are opened to a predetermined size in a trumpet shape.

The tubular portion 2 below the inner spring 23
The contact tongue 25 provided at the lower end of the 3C contacts the above-described first locking portion 22C to regulate the lower position of the inner spring 23.

On the other hand, the contact tongue 24 provided on the upper cylindrical portion 23B serves as a contact tongue when the linear element 22 accommodated in the coil portion 7 is expanded. Tongue 2
The upper surface of 4 abuts on the intermediate step 9A to regulate the upper position of the inner spring 23.

In this state, the inner spring 23 comes into contact with the first locking portion 22C of the linear element 22 and its lower position is also regulated. It can be extended.

The upper contact tongue 24 also has a function of positioning the lower end of the first tube 22B attached to the conductive metal wire 22A by contacting the upper surface thereof. The tongue portion 24 is provided with the first tube 22 with a predetermined area.
It has a portion projecting outward from B, and that portion comes into contact with the upper stopper 10.

The upper end of the first tube 22B is
It is positioned at the upper position of the conductive metal wire 22A by a second locking portion 22D integrally formed by crushing.

As will be described later in detail, the second locking portion 22D is provided for restricting the position of the first tube 22B upward until the joint portion 4 is formed. 4 is provided so as to cover the second locking portion 22D of the conductive metal wire 22A and the upper periphery of the first tube 22B.

The whip portion 21 configured as described above is provided with the hole 16A of the holder 16 formed in a cylindrical shape.
It is arranged so that it can be stored inside.

An outer spring 17 projecting inward is provided in the hole 16A of the holder 16.
When the whip portion 21 is stored, the outer peripheral surface of the power supply fitting 3 is elastically held to maintain the stored state, and when the whip portion 21 is pulled out, the outer periphery of the lower stopper 30 is The whip portion 21 can be maintained in an extended state by elastically holding the surface.

The antenna according to the present embodiment is configured as described above. Next, a method of manufacturing the antenna will be described.

First, an elastic round wire serving as the conductive metal wire 22A is cut into a predetermined length, and the lowermost end thereof is crushed to integrally provide a first locking portion 22C, as shown in FIG. The inner spring 23 and the first tube 22B are sequentially mounted from above to form the inner spring inserted member 31.

At this time, the cylindrical portion 23 below the inner spring 23
C lower end and contact tongue 25 formed on the same plane
Is in contact with the first locking portion 22C and the inner spring 2
Since the lower end of the first tube 22B abuts on the upper end of the cylindrical portion 23B above the upper portion 3 and the upper surface of the contact tongue portion 24 formed on the same surface as the upper end, the inner spring 23 and the first tube 22B become conductive. It is surely and easily combined with a predetermined position of the metal wire 22A.

Further, since the inner spring 23 has a vertically symmetrical shape with no vertical direction, it is not necessary to consider the vertical direction of the inner spring 23 at the time of mounting.
Has very good workability and can be inserted with high work efficiency.

At this time, by recognizing and identifying the size and shape of the first locking portion 22C provided integrally with the conductive metal wire 22A with a camera, it is possible to easily determine a defect at this point, and to determine only good products. By selecting and combining, inspection man-hours and the like can be simplified, and automatic production can be easily performed.

Subsequently, the first tube 22 combined with the conductive metal wire 22A provided with the first locking portion 22C is provided.
As shown in FIG. 8, the upper position of the conductive metal wire 22A is crushed to match the upper end position of the conductive metal wire 22A.
The first tube 22B is provided integrally with the second locking portion 22D.
Is temporarily fixed to form a tube fixed member 32.

At this time, predetermined irregularities may be simultaneously formed on the upper end portion of the conductive metal wire 22A. With this structure, after the joint portion 4 described later is formed, The strength with which the metal wire 22A comes off can be increased.

Then, as shown in FIG. 9, the tube-fixed member 32 is moved from the upper second locking portion 22D side to the coil portion 7 having the upper stopper 10 and the lower stopper 30 fixed to the upper and lower portions, respectively. The lower stopper 30 is inserted into the through hole 30B.

At this time, the two members to be combined are easy to handle because both parts are temporarily fixed or in a fixed state as one member. In addition, high quality products can be easily obtained because the number of causes of defects during the work can be reduced.

Finally, the through hole 3 of the lower stopper 30
0B, the tube-fixed member 32 is pushed up by a jig or the like to position the first tube 2 against the upper end of the linear element 22 protruding outward from the upper stopper 10.
The joint portion 4 is formed by molding with an insulating resin so as to include the upper portion of 2B, and the top portion 2 is coaxially mounted on the linear element 22 to obtain the antenna according to the present invention shown in FIG.

The top portion 2 may be attached to the linear element 22 at the same time as the joint portion 4 is formed. Alternatively, after the joint portion 4 is formed, the power supply fitting 3 is swaged to the joint portion 4. May be fixed.

The antenna according to the present invention is manufactured and configured as described above. For a device to be used such as a mobile phone, a holder is attached to a housing 18 of the device to be used in the same manner as in the prior art. By fixing 16, it is mechanically and electrically attached to the mobile phone (see FIG. 3).

When making a call using the mobile phone, for example, when the whip portion 21 of the antenna is extended as shown in FIG. 1, the linear element 22 and the coil portion which are in a conductive state with each other as described above. 7 are pulled out coaxially from the inside of the housing 18, the position thereof is maintained by the elastic force of the inner spring 23, and the outer spring 17 elastically holds the lower stopper 30 electrically connected to the whip portion 21. .

At this time, the first-stage linear element 22 of the whip portion 21 is pulled out to a predetermined position by the upper surface portion of the contact tongue portion 24 of the inner spring 23 contacting the intermediate step portion 9A of the upper stopper 10. , And the second-stage coil portion 7 also has the lower stopper 3.
0 is pulled out until the lower end large-diameter portion 30 </ b> A contacts the lower surface of the holder 16.

Then, the contact tongue 2 above the inner spring 23
4 abuts on the intermediate step 9A of the upper stopper 10 with a predetermined area, while the contact tongue 25 below the inner spring 23 contacts the first locking portion 22C formed integrally with the conductive metal wire 22A. Since the contact is made in a predetermined area, the force applied at the time of the above-described extension is dispersed and applied to the inner spring 23, and the inner spring 2
Unnecessary deformation or the like does not occur in 3.

In other words, the linear element 22 can be reliably positioned at the fixed position when extended by only the inner spring 23 mounted on the lower end, and can maintain that state.
A desired antenna characteristic can be obtained even with a smaller number of components than the conventional one.

At the time of the above extension, the whip portion 21 functions as an antenna, and the transmitted / received signal is transmitted to the electric circuit (not shown) in the housing 18 via the lower stopper 30, the outer spring 17 and the holder 16. Is transmitted to

On the other hand, when the whip portion 21 shown in FIG. 3 is housed in the housing 18 of the mobile phone used, the outer spring 17 elastically contacts and holds the outer peripheral portion of the power supply fitting 3. A transmission / reception signal from the first antenna element 1 of the top portion 2 sometimes functioning as an antenna is
The electric power is transmitted to an electric circuit in the housing 18 via the holder 7 and the holder 16.

In any of the above states, the whip section 21 is provided so that the same transmission / reception frequency band can be transmitted / received.
The fact that the effective line lengths of the first antenna elements 1 of the top part 2 are matched to substantially the same length is the same as in the case of the prior art.

As described above, the antenna according to the present embodiment can be used as the linear element 22 without using another separate member.
Since the lower position of the inner spring 23 is regulated by the first locking portion 22C integrally formed with the upper stopper 10 and the upper end of the inner spring 23 is brought into contact with the upper stopper 10 at the time of extension, the number of parts The number of assembling steps and management steps can be greatly reduced.

In this embodiment, the contact tongues 24 and 25 as contact function portions are formed at the upper and lower ends of the inner spring 23, respectively, to increase the area of contact with other members. Since the inner spring 23 can reliably contact other members with a simple configuration, antenna characteristics such as when the antenna is expanded become more stable.

If the ribs are formed at the roots of the contact tongues 24 and 25 to reinforce them, deformation of the contact tongues 24 and 25 is reduced, and the stability is further improved. Antenna characteristics.

In the above description, the contact tongues 24 and 25 are provided at the upper and lower ends of the inner spring 23, respectively, but they may be provided only on one side.

If the antenna characteristics can be obtained, the upper and lower ends of the inner spring 23 can be directly brought into contact with other members without providing the contact tongues 24 and 25 as the contact function section. Alternatively, a spacer, a metal caulking member, or the like may be attached to the linear element 22 as in the related art, and the contact function portion of the inner spring 23 may be brought into contact with the spacer.

Further, the shape of the contact function portion of the inner spring 23 may be a shape other than the contact tongue portions 24 and 25 described above. For example, in the partially enlarged sectional view of FIG. 10 and the top view of FIG. As shown, the upper and lower cylindrical portions 41A of the inner spring 41 are shown.
A similar effect can be obtained by having the contact projection 42 projecting outward in the shape of a petal, and making the upper and lower ends contact each other.

At this time, since the cylindrical portion 41A provided with the contact convex portion 42 is reinforced by the contact convex portion 42, the effect of improving the strength of the cylindrical portion 41A is also obtained. be able to.

In this case, if the contact projections 42 are provided at equal angular intervals on the outer periphery of the linear element 22, machining is easy, and the inner spring 41 applied from each contact point is provided. Can be applied evenly over the entire circumference, so that the linear element 22 on which the inner spring 41 is mounted is mounted.
Can be reduced, and an antenna having a good appearance and stable antenna characteristics can be easily obtained even when the antenna is expanded.

Further, as shown in a partially enlarged sectional view of FIG. 12, the inner spring 51 is formed by increasing the material thickness only at the upper and lower ends of the cylindrical portion 51A, and the outer peripheral portions of the upper and lower ends are brought into contact with each other. You may make it contact another member as a part.

In this case, it is necessary to use materials having different thicknesses as the material of the inner spring 51.
For 1, a very simple shape is sufficient,
The number of forming steps can be reduced, and the cost does not increase significantly.

[0098]

As described above, in the antenna of the present invention, the position is regulated by directly contacting the inner spring with another member such as the first locking portion or the upper stopper provided integrally with the linear element. Therefore, it is possible to obtain an advantageous effect that the number of parts can be reduced and the number of manufacturing steps and management steps involved can be reduced.

Further, a contact function portion is provided on the inner spring,
If the contact function part is configured to contact another member,
Since the inner spring comes into contact with another member in a more stable state, it is possible to easily obtain a more stable antenna characteristic.

Further, if the inner spring has a contact function portion having the same shape at the upper and lower ends, the inner spring can be inserted into the conductive metal wire without considering the vertical direction of the inner spring. It is also possible to improve.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a state in which a whip antenna according to an embodiment of the present invention is extended.

FIG. 2 is a partially enlarged cross-sectional view of a whip portion, which is a main portion of the same.

FIG. 3 is a sectional view showing a state in which the antenna shown in FIG. 1 is housed in a housing of a device to be used;

FIG. 4 is an external perspective view corresponding to the state of FIG. 1;

FIG. 5 is a top view of an inner spring serving as the main constituent member.

FIG. 6 is a bottom view of the inner spring that is the main component.

FIG. 7 is a view for explaining the manufacturing method, and is a cross-sectional view showing a state in which the inner spring and the first tube are inserted into the conductive metal wire to manufacture the spring-inserted member.

FIG. 8 is a view for explaining the manufacturing method, and is a cross-sectional view showing a state of manufacturing a tube-fixed member in which an upper position of a first tube is temporarily fixed.

FIG. 9 is a view for explaining the manufacturing method, and is a cross-sectional view showing a state where the tube-fixed member is inserted into the coil portion.

FIG. 10 is a partially enlarged cross-sectional view of an antenna having an inner spring in which a whip portion serving as the main portion is provided with a contact function portion having another shape.

FIG. 11 is a top view of the inner spring.

FIG. 12 is a partially enlarged cross-sectional view of an antenna having an inner spring in which a whip portion, which is the main part, has a contact function portion of another shape.

FIG. 13 is a sectional view showing a state in which a conventional whip-type antenna is extended.

FIG. 14 is a partially enlarged cross-sectional view of a whip part, which is the main part.

FIG. 15 is a sectional view showing a state in which the antenna shown in FIG. 13 is housed in a housing of a device to be used;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st antenna element 2 Top part 3 Power supply fitting 4 Joint part 7 Coil part 7A hole 8 Second tube 9 Center hole with a step 9A Intermediate step part 9B Small circular hole 9C Large circular hole 10 Upper stopper 16 Holder 16A hole 17 Outer spring 18 Housing 21 Whip part 22 Linear element 22A Conductive metal wire 22B First tube 22C First locking part 22D Second locking part 23, 41, 51 Inner spring 23A Arc-shaped part 23B, 23C, 41A, 51A Tubular part 24, 25 Contact tongue 30 Lower stopper 30A Lower end large diameter part 30B Through hole 30C Upper opening hole 31 Inner spring inserted member 32 Tube fixed member 42 Contact convex part

Continued on the front page F term (reference) 5J046 AA08 AA09 AA19 AB06 FA05 FA09 JA01 JA06 JA07 JA12 5J047 AA08 AA09 AA19 AB06 FA04 FA06 FA08

Claims (9)

[Claims] 1. A top part having a first antenna element and a power supply fitting electrically connected to the first antenna element, and a first-stage member connected to the top part via an insulating joint part. A whip portion as a second antenna element disposed in a conductive state in the second-stage coil portion, and a holder portion for holding the whip portion so as to be housed therein, wherein the whip portion is provided in the first-stage coil portion. The inner spring attached to the member becomes conductive with the second stage coil portion, and the lower end of the inner spring is formed integrally with the first stage member by a locking portion, An antenna whose lower position is regulated. 2. A top part having a first antenna element and a power supply fitting electrically connected to the first antenna element, and a first-stage member connected to the top part via an insulating joint part. A whip portion as a second antenna element disposed in a conductive state in the second-stage coil portion, and a holder portion for holding the whip portion so as to be housed therein, wherein the whip portion is provided in the first-stage coil portion. The inner spring mounted on the member is electrically connected to the second-stage coil portion, and the lower end of the inner spring contacts the upper stopper fixed to the upper portion of the coil portion, thereby regulating the upper position. The antenna in which the first-stage member is prevented from coming off. 3. An engaging portion integrally formed on both or one of the upper and lower ends of the inner spring, wherein the abutting function portion is formed integrally with the first-stage member. 3. The antenna according to claim 1, wherein the antenna is in contact with the upper stopper. 4. The antenna according to claim 3, wherein the contact function portions formed at the upper and lower ends of the inner spring have the same shape. 5. The contact function portion of the inner spring is constituted by a contact tongue extending outwardly.
The described antenna. 6. The antenna according to claim 3, wherein the contact function portion of the inner spring is constituted by a contact convex portion formed to protrude outward including an end portion. 7. The antenna according to claim 3, wherein the contact function portion of the inner spring is constituted by an outer peripheral portion of an end portion formed of a material having a thickness greater than that of the other portions. 8. The method for manufacturing an antenna according to claim 1, wherein a first step of processing the first-stage member to provide an integral locking portion, and an inner spring for the first-stage member is provided. And at least a second step of forming an inner spring-inserted member in which the lower position of the inner spring is regulated by the locking portion, and in a subsequent completion step, the inner spring is inserted into the inner spring-inserted member. On the other hand, a method of manufacturing an antenna that combines a coil portion, an upper stopper, a lower stopper, and the like. 9. The method of manufacturing an antenna according to claim 8, further comprising: inserting a tube through the first-stage member from above with respect to the member into which the inner spring has been inserted; A third step of mounting the inner spring by abutting on the upper end thereof, and crushing the position of the first-stage member protruding upward from the tube to restrict the position of the tube upward. The fourth step of constituting the fixed member, the tube fixed member is inserted into the coil portion to which the upper stopper and the lower stopper are fixed, through a hole provided at the bottom of the lower stopper, Forming an upper portion of the first-stage member projecting outward from the upper stopper with an insulating resin to form a joint portion.