JP2002314311A - Antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna in which an upper stopper and a lower stopper attached to the coil of a whip have a simply shape that does not depend on material and the manufacturing manhours to the coil is small being strong fixed and about a multistage antenna used in portable radio communication equipment, etc., typical for a portable telephone. SOLUTION: In this multistage antenna, the shape of the cross section of a strip-shaped body 23 constituting the coil 22 to be a second stage member is provided with a protrusion 23A on an outer surface, a spiral recessed part 24 with the width and depth of prescribed dimensions is provided on the outer circumference of the coil 22, and the upper stopper 26 and the lower stopper 28 are subjected to caulking so as to make a cylindrical inner circumferential wall intrude into the recessed part 24.

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.

[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. 8 is a cross-sectional view showing a state in which a conventional whip-type antenna is extended, and FIG. 9 is a cross-sectional view showing a state in which the antenna shown in FIG. .

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.

That is, 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.

In the whip portion 5, a flexible linear element 6 in which a conductive metal wire 6A is covered with a tube 6B is a first-stage portion, and a lower portion of the linear element 6 has a cross-sectional shape. It is inserted into a hole 8A of a coil portion 8 formed by spirally winding a substantially oval band.

At the lower end of the linear element 6, an inner spring 7 is mounted in conduction with the linear element 6.

The inner spring 7 has an arc-shaped portion 7A projecting outwardly in elastic contact with the inner wall of the coil portion 8, and the linear element 6 and the coil portion 8 are conducted through the inner spring 7.

Reference numeral 9 denotes a cylindrical upper stopper made of brass provided with a stepped central hole 10. The stepped central hole 10 is located above a flat intermediate step 10A. Is a small-diameter circular hole 1 through which the linear element 6 can be inserted.
0B, large-diameter hole portion 1 with screw portion 10C on the inner peripheral wall at the bottom
0D.

The screw portion 10C of the large-diameter hole portion 10D is formed so as to be screwed into a spiral recessed portion 11 formed between substantially oval-shaped adjacent strips of the coil portion 8.

The upper stopper 9 is mounted on the large-diameter hole portion 1 with the linear element 6 inserted through the small-diameter circular hole 10B.
OD is screwed into the recess 11 of the coil unit 8 and fixed to the upper end of the coil unit 8.

At this time, the upper end of the coil portion 8 is in contact with the intermediate step portion 10A of the upper stopper 9 and has a function of regulating the position of the coil portion 8 upward.

Also, when the linear element 6 arranged so as to be accommodated in the coil part 8 is extended, the spacer 12 mounted on the upper part of the inner spring 7 comes into contact with the intermediate step part 10A and is positioned at the upper position. Is being regulated.

Further, the upper part of the tube 13 covering the outer periphery of the coil part 8 is also fixed by the upper stopper 9.

On the other hand, reference numeral 14 denotes a lower stopper disposed at the lower end of the coil section 8, which is electrically connected to the coil section 8.

The lower stopper 14, like the upper stopper 9, also has a screw portion 15A on the inner peripheral wall of the upper opening hole 15B corresponding to the recess 11 on the outer peripheral surface of the coil portion 8, and the lower end of the coil portion 8 And has a function of regulating the lower position of the coil portion 8 with the bottom surface, and also fixes the lower portion of the tube 13.

The whip portion 5 configured as described above is provided with a hole 1 of a cylindrical metal holder 16.
An outer spring 17 is provided in the hole 16A so as to be able to hold the outer peripheral surface of the power supply fitting 3 or the lower stopper 14 in the hole 16A.

As described above, the conventional two-stage whip-type antenna is constructed, and this antenna is mechanically and electrically driven by fixing the holder 16 to the housing 18 of the mobile phone used as the equipment. Is usually attached to a mobile phone.

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 8 electrically connected via the inner spring 7 are extended. 8 is pulled out coaxially from the inside of the housing 18 and the outer spring 17 of the holder 16 elastically holds the outer peripheral portion of the lower stopper 14 (FIG. 8).
reference).

At this time, a transmission / reception signal in the whip portion 5 functioning as an antenna is transmitted to an electric circuit (not shown) in the housing 18 via the lower stopper 14, the outer spring 17, and the holder 16.

On the other hand, as shown in FIG. 9, 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 case, the first antenna element 1 of the top part 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 18.
Is transmitted to the internal electric 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 the same length.

[0028]

However, in the above-mentioned conventional antenna, the upper stopper 9 and the lower stopper 14 are screwed and fixed to the coil portion 8, so that the number of assembling work steps is increased. If the rattling occurs in the fixed state of, the corresponding frequency band at the time of extension of the whip portion 5 fluctuates, so that the concave portion 11 of the coil portion 8 and the respective screw portions 10C and 15A.
Has to be formed accurately and screwed together.

Then, the upper stopper 9 and the lower stopper 1
4, the screw portions 10C and 15A are connected to the large-diameter hole portion 10D.
In addition, since it had to be formed on the inner peripheral wall of the upper opening hole portion 15B, it took a lot of man-hours to form the material, and the material of the material was limited to a material having good workability, for example, brass having a large specific gravity. In recent years, it has been difficult to cope with weight reduction of portable devices.

The present invention solves such a conventional problem, and the upper stopper and the lower stopper mounted on the coil portion of the whip portion need only have a simple shape independent of the material. An object of the present invention is to provide an antenna which is firmly fixed to the coil part with a small number of manufacturing steps.

[0031]

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 to the top portion via an insulating joint. The first member connected is
A cross-sectional shape of a band-shaped body comprising a whip portion as a second antenna element disposed in a conductive state in a second-stage coil portion and a holder portion for holding the whip portion so as to be housed therein. Is a substantially rectangular shape having a protrusion or a concave portion on the outer surface side, and the outer peripheral surface of the coil portion is provided with a spiral recess formed between the protrusions or the concave portion itself. An upper stopper or a lower stopper for retaining, which is attached to the upper and lower ends of the antenna, is an antenna that is bitten into the recess and fixed by caulking, and the coil portion has a projection or a recess on the outer surface side. Since it is configured using the band shape of a rectangular cross section, the spiral concave portion on the outer peripheral surface of the coil portion can be provided with a large step with a predetermined width, and the coil of the upper stopper and the lower stopper can be coiled. The portion to be engaged with the portion is formed in a simple cylindrical shape independent of the material, inserted into the coil portion, and the inner wall portion of the cylindrical shape is bitten into the concave portion by pressing, etc., and only crimping is fixed. The upper and lower stoppers can be firmly fixed to the coil part with man-hours, and the upper and lower stoppers can be of a simple shape. This has the effect of reducing the weight of the antenna.

According to a second aspect of the present invention, in the first aspect of the invention, the upper stopper or the lower stopper is caulked and fixed in a ring shape in a horizontal direction perpendicular to the axial direction of the coil portion. Since the swaged portion over the entire circumference of the coil portion can be swaged and fixed at an angle to the spiral recessed portion of the coil portion, the swaged fixing position always corresponds to the spiral recessed portion of the outer peripheral surface of the coil portion. The upper stopper and the lower stopper can be firmly fixed to the coil portion with a small number of steps even when a portion can be included and the hollow portion of the coil portion is difficult to visually recognize because the portion is covered with a tube or the like.

According to a third aspect of the present invention, in the invention of the second aspect, the upper stopper or the lower stopper is fixed by caulking at a plurality of locations in a ring shape, and the interval between the caulking positions is equal to the recess of the coil portion. N turns (N is an integer including 0)
The pitch is a half pitch of the pitch between turns and +1 turn, and when a plurality of locations are caulked and fixed in a ring shape with the above specification to the spiral recess of the coil portion, it is symmetric with respect to the center axis of the coil portion Since the ring-shaped caulking portions include the recessed portions positioned in the directions, the upper and lower stoppers can be further firmly secured with less rattling and can be caulked.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the upper stopper or the lower stopper is crimped and fixed in a spiral shape corresponding to the concave portion of the coil portion. The stopper can be most firmly fixed to the coil portion, and has an effect of being excellent in design.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the upper stopper or the lower stopper is caulked and fixed in a dot shape so as to include a position corresponding to the concave portion of the coil portion. Since the crimped portion can be partially dispersed, the degree of influence such as pulling of the meat from the outer peripheral portion can be reduced in each crimp fixing portion, and the upper stopper and the lower stopper can be firmly fixed to the coil portion. At the same time, it has the effect of stabilizing the crimped state.

According to a sixth aspect of the present invention, in the first aspect of the present invention, the upper stopper is caulked and fixed so that the lower end thereof is narrowed inward, and a coil portion corresponding to the lower end is provided. Since there is always a part of the spiral recess on the outer circumference, the upper stopper can be firmly fixed to the coil by caulking, and the peripheral surface of the upper stopper can be used as a good sliding surface. It has the effect of making it possible.

According to a seventh aspect of the present invention, in the first aspect of the invention, the lower stopper is fixed by caulking so as to narrow the upper end thereof inward, and a coil portion corresponding to the upper end thereof. Since there is always a part of the spiral recess on the outer periphery, the lower stopper can be firmly fixed to the coil part and the peripheral surface of the lower stopper can be used as a good sliding surface. It has the effect of making it possible.

[0039]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment 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 7 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.
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. 3 is an external perspective view corresponding to the state in FIG.

As shown in the figure, 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 shell shape, and has a shell-shaped lower portion. In addition, 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 formed by connecting the conductive metal wire 6 A to the tube 6.
It is composed of a flexible linear element 6 covered with B, and an inner spring 7 is attached to the lower end of the linear element 6 in a conductive state to the linear element 6.

The lower part of the linear element 6 is inserted into a hole 22A of a coil part 22 formed by spirally winding a strip 23 having a shape to be described later. The arc-shaped portion 7A projecting to the inner surface of the hole 22A elastically contacts the inner peripheral wall of the hole 22A.
2 so as to be able to stop at predetermined positions.

The linear element 6 and the coil section 22 are always electrically connected via the inner spring 7.

The band 23 constituting the coil portion 22 has a substantially square cross section and has a trapezoidal projection 23A on the outer surface side. By being spirally wound, the outer peripheral surface of the coil portion 22 has a spiral concave portion 24 formed by connecting between the adjacent protrusions 23A.

At this time, the spiral concave portion 24 formed on the outer peripheral surface of the coil portion 22 has a width corresponding to the pitch between the projections 23A, and a depth corresponding to the large width or step formed by the height of the projections 23A. It has what has.

The cross-sectional shape of the band-shaped body 23 is not limited to a substantially square shape as long as the band-shaped body 23 has a projection 23A. The portions R may have different shapes.

The projection 23A may be triangular or rectangular in cross section, but it is preferable to arrange the projection at the center of the strip 23.

Further, instead of providing the projection 23A as the band 23, a concave portion may be provided on the outer surface side, and the concave portion may be spirally connected to form a coil portion provided with a spiral concave portion. .

Also in this case, the depression formed in the coil portion has a predetermined large width and a step corresponding to the width and depth of the concave portion of the strip.

It is to be noted that, even if the strip 23 has an irregular cross-sectional shape as described above, it is usually formed by extruding it. It does not increase significantly.

Reference numeral 26 denotes a small-diameter circular hole 25B through which the linear element 6 can be inserted, and a lower portion slightly larger than the coil portion 22 with respect to the flatly formed intermediate step portion 25A. Is a substantially cylindrical upper stopper having a stepped central hole 25 which is a circular large-diameter hole portion 25C.

The upper stopper 26 has a small diameter circular hole 25B.
The lower large-diameter hole portion 25C is inserted into the coil portion 2 covered with the tube 13 in a state where the linear element 6 is inserted so as to be able to be stored therein.
2, and a plurality of ring-shaped portions are fixed from the outside in a horizontal direction orthogonal to the axial direction of the coil portion 22.

The portion corresponding to the spiral recess 24 in the caulking portion 27 is subjected to a pressing process or the like from the outside to the inside of the large-diameter hole 25C, and the large-diameter hole 25C is formed. The inner peripheral wall is fixed so as to bite into the recess 24.

At this time, since the depression 24 on the outer periphery of the coil 22 is covered with the tube 13, it is difficult to visually recognize the depression.
As described above, the coiled portion 2
When the caulking portion 27 is fixed by a ring-shaped caulking portion 27 in the horizontal direction perpendicular to the center axis of the second, that is, by caulking and fixing the caulking portion 27 at a predetermined angle with respect to the spiral recess 24, The caulking portion 27 of the upper stopper 26 always includes a position corresponding to the spiral recess 24, and the recess 24 has a large width and a step. It is easily and firmly fixed to the coil part 22 with a small number of steps.

When the ring-shaped caulking portion 27 is caulked and fixed in the horizontal direction orthogonal to the center axis of the coil portion 22, the vertical displacement of the caulking position can be reduced, and the center axis is The entire circumference can be easily fixed by caulking in the direction in which it goes.

Further, as a ring-shaped caulking portion 27 caulked at a plurality of positions, the interval between the caulking positions is
When the pitch between N turns (N is an integer including 0) of the concave portion 24 of the coil portion 22 and a half pitch corresponding to one turn of the concave portion 24 are caulked and fixed in a ring relationship in a parallel relationship, the coil portion becomes Since the one and the other part of the recess 24 located in the symmetrical direction with respect to the central axis of 22 can be respectively included in the ring-shaped caulking part 27 and caulked and fixed.
The upper stopper 26 can be made firmer and harder to come off and fixed by caulking.

The upper stopper 26 is provided with the stepped central hole 2.
The fifth flat intermediate step 25A is fixed in contact with the upper end of the coil part 22 and has a function of regulating the position of the coil part 22 upward and fixing the upper part of the tube 13.

Also, when the linear element 6 arranged so as to be accommodated in the coil part 22 is extended, the spacer 12 mounted on the upper part of the inner spring 7 comes into contact with the intermediate step part 25A and is positioned at the upper position. Is being regulated.

On the other hand, at the lower end of the coil part 22, a lower stopper 28 for regulating the lower position of the coil part 22 and fixing the lower part of the tube 13 is pushed in the same manner as the upper stopper 26 in a state of conduction with the coil part 22. It is fixed by caulking by processing or the like.

The fixed state of the caulking portion 29 of the lower stopper 28 is the same as the state of the caulking portion 27 of the upper stopper 26, and a detailed description thereof will be omitted.

The whip portion 21 having the above structure is arranged so as to be housed in the hole 16A of the holder 16 formed in a cylindrical shape.

An outer spring 17 projecting inward is provided in the hole 16A of the holder 16, and the outer spring 17
When the whip portion 21 is stored, the power supply fitting 3
When the whip portion 21 is pulled out, the lower stopper 28 is held.
Of the whip portion 21 can be maintained by elastically holding the outer peripheral surface of the whip portion 21.

The antenna according to the present embodiment is configured as described above. By fixing the holder 16 to the housing 18 of the mobile phone, which is the device to be used, the antenna is mechanically and electrically connected to the mobile phone. The attachment is the same as in the prior art.

When making a call using the portable telephone, for example, by extending the whip portion 21 of the antenna as shown in FIG. 1, the linear element 6 and the coil portion, which are in a conductive state as described above, are connected. 22 is pulled out coaxially from the inside of the housing 18, the state is maintained by the elastic contact force of the inner spring 7, and the lower spring 28 that is in communication with the whip portion 21 is elastically held by the outer spring 17. .

At this time, the whip portion 21 functions as an antenna, and the transmitted / received signal is transmitted to the lower stopper 2.
8 is transmitted to an electric circuit (not shown) in the housing 18 via the outer spring 17 and the holder 16.

On the other hand, when the whip portion 21 shown in FIG. 2 is stored 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 the 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 length of the first antenna element 1 of the top part 2 is matched to the same length is the same as in the case of the related art.

As described above, the antenna according to the present embodiment has the coil portion 22 serving as the second stage portion of the whip portion 21.
Is formed in a spiral shape having a large width and a step on the outer peripheral surface of the coil portion 22, and the caulking is performed by utilizing the recess portion 24. Only by fixing, the upper stopper 26 and the lower stopper 28 can be firmly fixed.

Since the swaged portions 27 and 29 of the upper stopper 26 and the lower stopper 28 may bite into the recess 24 having a large width or a step, the upper stopper 26 and the lower stopper fixed thereby are formed. 2
8 is fixed to the coil section 22 with less rattling, and the fluctuation of the corresponding frequency band when the whip section 21 is extended can be reduced.

Further, the large-diameter hole 25C of the upper stopper 26,
And the upper opening 28A of the lower stopper 28
A simple circular shape that does not require a screw like the conventional technology can be used, so it is possible to use aluminum, etc., which is slightly inferior in workability but has low specific gravity, and as a result, it is possible to reduce the weight of the antenna Becomes

Further, since the above-described caulking fixing method can be performed with a smaller number of manufacturing steps than the screwing method, an effect of reducing the number of manufacturing steps of the antenna can be expected.

Further, even if the coil portion 22 is covered with the tube 13 or the like, that is, the spiral concave portion 24 formed on the outer peripheral surface of the coil portion 22 is hardly visible, the spiral concave portion By caulking and fixing in a ring shape in the horizontal direction so as to have a predetermined angle with respect to 24, it is possible to always include the recess 24 in the caulking portions 27 and 29, so that the upper stopper 26 The lower stopper 28 can be easily and firmly fixed to the coil section 22 with a small number of steps and can be fixed by caulking.

In the above description, the upper stopper 26 and the lower stopper 28 are caulked and fixed to the coil portion 22 in a ring shape. However, other stoppers may be used.

For example, as shown in the side view of FIG. 4, the upper stopper 31 is pressed in such a manner that the position of the upper stopper 31 is aligned with the spiral concave portion 24 of the coil portion 22, and fixed by the spiral caulking portion 32. In this case, the crimping force can be maximized and the design can be excellent.

Further, as shown in the side view of FIG. 5, the upper stopper 33 is pressed into a dot shape so as to include the position of the concave portion 24 of the coil portion 22 and is fixed by the dot-shaped caulking portion 34. In this case, the influence of the flesh surrounding the crimped portion can be reduced, and the individual dot-shaped crimped portions 34 are fixed with a larger fixing force.
The fixing force is almost the same as when the ring is fixed by caulking in the above-mentioned ring shape, and the ring is stable.

The caulking method shown in FIGS. 4 and 5 may be applied to the lower stopper.

Further, as shown in the side view of FIG. 6, when the entire periphery of the lower end portion 36 of the upper stopper 35 is narrowed inward and fixed by caulking, the caulking portion 37 is formed in a spiral shape of the coil portion 22. Since there is always a portion corresponding to the recessed portion 24, the upper stopper 35 can be firmly and easily fixed to the coil portion 22 by caulking.

The upper stopper 35 fixed by the caulking portion 37 can be provided with a good sliding surface with no irregularities on the outer peripheral surface.
6 can have a smooth and good sliding feel when contacting the outer spring 17.

Similarly, as shown in the side view of FIG. 7, even if the entire periphery of the upper end portion 39 of the lower stopper 38 is fixed by caulking inward, the caulking portion 40 has a coil. Since there is always a portion corresponding to the spirally formed concave portion 24 of the portion 22, the lower stopper 38 can be firmly and easily fixed to the coil portion 22 by caulking, and the outer peripheral surface of the lower stopper 38 has irregularities. Since it can be eliminated, the sliding feeling when the antenna 16 comes into contact with the outer spring 17 at the time of expansion and contraction of the antenna can be made smooth and favorable.

[0084]

As described above, the antenna according to the present invention has the following features.
The upper and lower stoppers fixed to the upper and lower ends of the coil section, which is the second stage, can be of a simple shape that does not depend on the material. An advantageous effect that a fixed antenna can be realized is obtained.

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

FIG. 4 is a side view of a partial cross section of an upper stopper portion which is caulked and fixed to a coil portion by a caulking portion having another shape.

FIG. 5 is a side view of an upper stopper portion which is fixedly swaged to the coil portion by a swaging portion having the same shape.

FIG. 6 is a side view of an upper stopper portion fixed to the coil portion by a caulked portion having the same shape.

FIG. 7 is a side view of a lower stopper portion fixed to the coil portion by a caulked portion having another shape.

FIG. 8 is a sectional view showing a state in which a conventional whip-type antenna is extended.

FIG. 9 is a sectional view showing a state in which the antenna shown in FIG. 8 is housed in a housing of a device to be used;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 first antenna element 2 top part 3 power supply fitting 4 joint part 6 linear element 6A conductive metal wire 6B tube 7 inner spring 7A arc-shaped part 12 spacer 13 tube 16 holder 16A hole 17 outer spring 18 housing 21 whip part 22 coil Part 22A Hole 23 Band 23A Projection 24 Depression 25 Center hole with step 25A Intermediate step 25B Small circular hole 25C Large diameter hole 26,31,33,35 Upper stopper 27,29,32,34,37,40 Caulking portion 28, 38 Lower stopper 28A Upper opening hole 36 Lower end 39 Upper end

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5J046 AA10 AB06 DA03 5J047 AA10 AB06 BF04 FA02 FA09 5K023 AA07 BB04 LL05

Claims (7)

[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 cross-section of a belt-shaped body comprising a whip portion serving 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. The shape is a substantially rectangular shape having a protrusion or a concave portion on the outer surface side, and the outer peripheral surface of the coil portion is provided with a spiral recess formed between the protrusions or the concave portion itself. The upper and lower stoppers for retaining which are attached to the upper and lower ends of the portion are bitten into the recesses and fixed by caulking. 2. The antenna according to claim 1, wherein the upper stopper or the lower stopper is fixed in a ring shape in a horizontal direction orthogonal to the axial direction of the coil portion. 3. An upper stopper or a lower stopper is fixed by caulking at a plurality of locations in a ring shape, and the interval between the caulking positions is N turns (N is an integer including 0) of a concave portion of the coil portion.
3. The pitch between the two pitches, which is a half pitch of the pitch between turns plus one turn.
The described antenna. 4. The antenna according to claim 1, wherein the upper stopper or the lower stopper is crimped and fixed in a spiral shape corresponding to the concave portion of the coil portion. 5. The antenna according to claim 1, wherein the upper stopper or the lower stopper is caulked and fixed in a dot shape so as to include a position corresponding to the concave portion of the coil portion. 6. The antenna according to claim 1, wherein the upper stopper is caulked and fixed such that a lower end portion thereof is narrowed inward. 7. The antenna according to claim 1, wherein the lower stopper is caulked and fixed such that an upper end thereof is narrowed inward.