JP2002009524A - Antenna for portable wireless unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna for a portable wireless unit that can improve the yield with a reduced cost. SOLUTION: A top mold section 16 of nearly a cylindrical shape is integrally formed to an upper end of a top plug 12. A coil element 17 is contained in a coil element container section 16c in the formed top mold section 16. Then a joint 13 integrally formed at a tip of a whip element 15 is penetrated in the top plug 12 via the coil element 17. In this cage, an engagement projection formed to a flange part 13a of the joint 13 engages with an engagement hole 16f formed to a mold upper part 16b. Then a cap 11 is fitted to the top mold section 16. In this case, a ring shaped lock projection 16e formed to a mold lower part 16d is engaged with the inside of a ring shaped recessed part 11b to fix the cap 11 so that the cap does not slip off.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable radio antenna provided for a portable radio such as a portable telephone.

[0002]

2. Description of the Related Art Recently, portable telephones have become widespread, and these portable telephones are provided with an antenna for transmitting and receiving calls and information. In general, this antenna is an antenna composed of an expandable and contractible whip element that can be stored in a housing of a mobile phone so that it is convenient to carry when waiting. However, when the whip element is housed in the housing, the mobile phone becomes almost impossible to transmit and receive. Therefore, even when the whip element is housed in the housing, the small coil element located outside the housing is moved by the whip element. To be provided at the front end. Thus, when the whip element is stored in the housing, transmission and reception can be performed using the coil element.

FIG. 14 shows an example of the configuration of a conventional portable radio antenna in such a portable radio antenna. In the portable wireless device antenna 300 shown in this figure, the whip antenna portion 313 is formed of a linear element, and is slidably fitted into a metal antenna holder 314, and the antenna holder 314 is attached to the portable wireless device. When fixed to the case, the whip antenna unit 313 can be extended with respect to the case. An insulating joint 312 extending through the top plug 311 and extending into the top portion 310 is integrally formed at the tip of the whip antenna portion 313, and a metal stopper portion 315 is fixed to the other end. Have been. Stopper part 3
Reference numeral 15 is used to be inserted into the antenna holder 314 when the whip antenna unit 313 is extended, and to electrically connect the whip antenna unit 313 to the antenna holder 314 via the stopper unit 315. The antenna holder 3 is provided at the lower end of the stopper portion 315.
An engaging portion 315a is formed to abut on the lower surface of 14.

The joint 312 is formed integrally with the tip of the whip antenna 313, and is formed by insert-molding the top plug 311 when integrally formed. Although not shown, the upper part of the joint 312 is extended into the top part 310 so that the top part 310 and the whip antenna part 313 are positioned substantially uniaxially.
13 is fixed. Further, although not shown, the top of the top plug 311 made of metal is
10, the terminal ends of the coil elements housed in the top portion 310 are electrically connected.
Thereby, when the whip antenna unit 313 is stored, the top plug 311 is inserted into the antenna holder 314 from above, and the coil element is
11 to be electrically connected to the antenna holder 314.

[0005]

In a conventional portable radio antenna 300 shown in FIG.
2 is inserted into a small-diameter top plug 311 to form a top portion 310 and a whip antenna portion 3.
And 13 are integrated. However, joint 3
12 during insert molding,
And the top portion 310 need to be formed so as to be arranged on one axis. However, when the joint 312 is insert-molded, there is a problem that the arrangement position is easily shifted from the one axis and appearance defects are apt to occur. . Further, the joint 312 must be inserted into the top plug 311 having a small diameter, and there is a problem that a weld or the like is easily generated. When a weld is generated, an accident that the joint 312 is broken during use is likely to occur. Further, when the molding material passes through the top plug 311, the top plug 3
There is also a problem that foreign matter remaining in the inside 11 is mixed and appears on the surface of the molded joint 312, and appearance defects easily occur.

[0006] The top portion 310 is covered with a cap. The cap is integrally molded or fixed using an adhesive to form the top portion 310. In this case, when the top part 310 is formed by integrally molding the cap, the coil element disposed in the top part 310 is embedded in the cap, which is a dielectric, so that the electrical characteristics of the antenna made of the coil element Is not good. Further, there is a problem that foreign matters remaining in the molding die appear on the surface of the molded cap, and poor appearance is likely to occur. In addition, if the cap is fixed by using an adhesive, a work process such as applying the adhesive and its management become necessary, and the appearance of the adhesive becomes poor due to the protrusion of the adhesive, or the shortage of the adhesive causes Problems such as dropping of the cap occur. As described above, the portable radio antenna having the poor appearance must be discarded as a whole, and the above-mentioned problems cause a decrease in yield and an increase in cost.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a portable radio antenna capable of improving the yield and reducing the cost.

[0008]

In order to solve the above-mentioned problems, an antenna for a portable wireless device according to the present invention comprises a substantially cylindrical mold portion having a housing portion for housing a coil element therein. When the coil element is housed in the mold section, the lower end of the coil element is electrically connected to antenna feeding means extending from the lower end of the mold section, and the mold section in which the coil element is housed. A cap having a bag-like shape fitted so as to be wrapped so as to be fixed to the mold portion.

In the portable radio antenna according to the present invention, a lower portion of the molding portion may be molded integrally with an upper portion of the antenna feeding means. Further, in the portable wireless device antenna of the present invention, locking means is formed on a peripheral side surface of the mold portion, and locked means is formed on an inner peripheral surface of the cap, When the cap is fitted to the mold portion, the cap may be fixed to the mold portion by locking the non-locking means to the locking means. Furthermore, in the antenna for a portable wireless device of the present invention, a projection projecting from an inner surface of an upper end of the cap is formed, and when the cap is fitted to the mold portion, the projection is formed by the projection. By contacting the upper end of the coil element, the length of the coil element may be defined as the distance between the antenna feeding means and the protrusion.

Next, another portable radio antenna according to the present invention, which can solve the above-mentioned problems, is slidably held by a holder attachable to a housing of the portable device, and is attached to the holder. The whip antenna section, which is formed of a linear whip element whose lower end is electrically connected to the holder when extended, and the coil element is housed therein and is positioned substantially coaxially with the whip antenna section. An antenna top portion that is fixed, the antenna top portion is formed integrally with a top plug of a pipe shape extending from a lower end so as to be slidable with the holder, and an upper portion of the top plug. And a top mold section in which a storage section in which the coil element is stored is formed, and when stored in the top mold section, A coil element electrically connected to a top plug, a flange formed at an upper end to hold the coil element between the top plug, and a whip extending downward from the flange. By being integrally formed at the tip of the element and being fitted so as to cover the top mold portion, a joint comprising an insulating joint body inserted into the coil element and the top plug is fitted. And a cap shaped like a bag to be fixed.

Further, in the above-mentioned another antenna for a portable wireless device according to the present invention, an engaging means is formed on an upper portion of the top mold portion, and an engaged means for engaging with the engaging means is formed on the flange portion. Then, the length of the coil element may be defined as the length from the top plug to the engaging means by engaging the non-engaging means with the engaging means. Further, in the above-mentioned antenna for another portable wireless device according to the present invention, a locking means is formed on a peripheral side surface of the top mold portion, and a locked means locked by the locking means is an inner peripheral surface of the cap. When the cap is fitted to the top mold portion, the non-locking means is locked to the locking means, so that the cap is fixed to the top mold portion. It may be. Still further, in another portable wireless device antenna according to the present invention, a slit is formed in an upper portion of the top mold portion, and when the non-engagement unit engages with the engagement unit, the top mold unit is closed. The upper part may be expanded.

Still further, in the above-mentioned another antenna for a portable radio device according to the present invention, a tapered portion may be formed in the middle of the top plug, so that a diameter of an upper portion of the top plug is increased. Still further, in another portable wireless device antenna according to the present invention, a joint slit portion is formed at an upper portion of the joint, and when the non-engaging means is engaged with the engaging means, the upper portion of the joint is formed. May be closed. Still further, in another portable radio antenna according to the present invention,
A protrusion inserted into the joint slit portion formed in the joint is formed on an inner surface of a tip of the cap, and when the cap is fitted into the top mold portion, the protrusion inside the joint slit portion is formed. The upper part of the joint may not be able to be closed and closed by inserting the protruding part into the joint.

According to the present invention, the cap can be fixed to the mold section by fitting the cap to the mold section. That is, since the antenna for the portable wireless device can be produced by assembly without using an adhesive, it is possible to prevent the appearance defect due to the protrusion of the adhesive and to simplify the operation process. it can. As a result, the yield can be improved and the cost can be reduced. In addition, when a projection is formed on the inner surface of the upper end of the cap, which is in contact with the upper end of the coil element, when the cap is fixed to the mold section, the coil element is sandwiched between the mold section and the cap so as to be compressed. hand,
The length can always be a predetermined length. As a result, variations in the electrical characteristics of the coil elements can be suppressed, and the yield can be improved.

Further, since the coil element is accommodated in the space in the mold portion and is not embedded in the dielectric, variation in the electrical characteristics of the coil element can be suppressed, and the yield can be further improved. Furthermore, since the coil element is housed in a substantially cylindrical mold part, and the mold part is further covered with a cap, the coil element is protected by a double structure, and is deformed even when a horizontal load is applied. The coil element can maintain the electrical characteristics of the place for a long time without doing so.

In the above-mentioned another antenna for a portable wireless device according to the present invention, the insulating joint formed integrally with the tip of the whip element is integrated with the coil element housed in the top mold portion and the top mold portion. By inserting the coil element into the top plug, the coil element is arranged at the upper part and the whip element is arranged at the lower part, thereby making it possible to assemble a telescopic portable radio antenna. This portable radio antenna is manufactured by assembling the portable radio antenna without using an adhesive by inserting a joint into the coil element and the top plug and fitting the cap to the top mold portion. Can be. For this reason, it is possible to prevent the appearance failure due to the protrusion of the adhesive, and to simplify the operation process. As a result, the yield can be improved and the cost can be reduced.

When a slit is formed in the upper portion of the top mold portion, the upper portion of the top mold portion is easily expanded when the joint is inserted, and the engaged means formed in the flange portion is engaged. The means can be easily engaged. Thereby, work efficiency can be improved. Further, a tapered portion is formed in the middle of the top plug so that the diameter of the upper portion of the top plug is increased.
The upper portion of the top plug is a boundary portion with the top mold portion, and is a portion to which the lateral load is applied in a concentrated manner. That is, since the diameter of the portion where the load is concentrated is increased,
The load resistance can be improved, and breakage can be prevented.

Furthermore, if a joint slit is formed in the upper part of the joint, the upper part of the joint will be closed and closed when the joint is inserted, and the engaged means formed in the flange will be engaged. It becomes easy to engage with the means. Thereby, work efficiency can be improved. In order to prevent the upper part of the joint from contracting and closing after assembly, a protrusion inserted into the slit may be formed on the inner surface of the tip of the cap.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the overall configuration of a first embodiment of a portable radio antenna according to the present invention. Figure 1
As shown in FIG. 1, the antenna 1 for a portable wireless device according to the first embodiment of the present invention includes a whip antenna 2 and an antenna top 3, and the whip antenna 2 and the antenna top 3 are insulative. Are mechanically connected by a joint 13. The tip of the linear whip element constituting the whip antenna unit 2 is a joint 1
3 is formed integrally with one end, and the lower end of the whip element is fixed to a conductive stopper portion 14. Further, the whip antenna unit 2 is slidably held by a conductive holder unit 4.

In the portable radio device antenna 1 thus configured, the holder 4 made of, for example, metal is attached to a housing of a portable telephone or the like, and the whip antenna 2 is extended with respect to the holder 4. The stopper portion 14 is inserted and held in the holder portion 4 from below.
4 a comes into contact with the lower surface of the holder 4. As a result, the whip antenna unit 2 is electrically connected to the holder unit 4, and only the whip antenna unit 2 is in an operating state. When the whip antenna unit 2 is stored in the housing, the joint 13 is inserted into the holder unit 4 from above until the lower surface of the antenna top unit 3 contacts the upper surface of the holder unit 4, and the joint 13 is inserted. For example, a conductive top plug 12 made of metal is electrically connected to the holder 4. As a result, only the coil element described below, which is connected to the top plug 12 and housed in the antenna top part 3, enters the operating state. Therefore, when the portable wireless device antenna 1 of the present invention is applied to a portable telephone, if the portable wireless device antenna 1 is extended, the portable wireless device antenna 1 can be efficiently transmitted / received using the whip antenna unit 2 and the portable wireless device can be used. When the mechanical antenna 1 is housed in a compact form, transmission and reception can be performed using the coil element housed in the antenna top portion 3.

Although the whip antenna 2 and the antenna top 3 are insulated by the joint 13,
This is because the whip antenna unit 2 and the coil element are used independently as antennas. That is, when a capacitance is generated between the top plug 12 serving as the feeding means of the coil element and the whip antenna section 2, the coil element and the whip antenna section 2 are electrically coupled to each other, and the operation of each antenna is performed. Will have an adverse effect. In order to prevent this, the antenna top part 3 and the whip antenna part 2 are sufficiently separated from each other so that an insulative joint 13 is formed so that no capacitance is generated.
It is separated by.

Next, the portable radio antenna 1 according to the first embodiment of the present invention shown in FIG. 1 is characterized by its upper configuration, and is an exploded assembly view in which the upper configuration is enlarged. FIG. 2 is a cross-sectional view showing the configuration of the upper portion of the assembled portable radio antenna 1 shown in FIG. 2, and FIG. 4 is a partial cross-sectional view showing the upper configuration of the assembled portable radio antenna 1. . As shown in these figures, the whip antenna unit 2
The lower part of a resin joint 13 is integrally formed and fixed to the tip of the whip element 15 constituting the above. At this time, an enlarged deformed portion 15a shown in the drawing for preventing the whip element 15 made of, for example, superelastic metal from coming out of the joint 13 is formed at the tip end portion. The whip element 15 is covered by being inserted into an elastic insulating tube 18 made of synthetic resin. As shown in FIG. 1, a conductive stopper 14 made of, for example, a metal and having a diameter larger than that of the insulating tube 18 is electrically connected to the whip element 15 at the other end of the whip antenna 2. Is fixed. Further, the holder portion 4 for holding the whip antenna portion 2 so as to be able to expand and contract is inserted into the whip antenna portion 2 before the stopper portion 14 is fixed.

A spring (not shown) is accommodated in a through-hole formed in the holder portion 4 so that the holder portion 4 can slide and hold the whip antenna portion 2 without fail. A ring-shaped groove 13c is formed between the lower end of the joint 13 and the whip element 15, and one end of the insulating tube 18 is inserted into the ring-shaped groove 13c. A joint 13 made of resin such as nylon resin or PBT resin in which the tip of the whip element 15 is molded.
Is composed of an elongated rod-shaped joint body 13b, and a flange 13a is formed at the tip of the joint body 13b. Further, although not shown, the flange portion 13a
A pair of engaging projections 13d (see FIG. 7 described later) are formed on the opposite edges of the pair.

The top mold portion 16 is formed in a substantially cylindrical shape by molding an ABS resin, an elastomer resin, or the like, and the upper end of the top plug 12 is integrally formed at the time of molding. A flange portion 12 b is formed at the upper end of the pipe-shaped top plug 12, and the upper surface of the flange portion 12 b is exposed in the top mold portion 16. The coil element storage section 16c formed in the top mold section 16 is a storage space for the coil element 17, and is capable of storing the coil element 17 wound in a helical shape. A pair of slits 16a are formed in a mold upper portion 16b of the top mold portion 16. The pair of slits 16a are formed so as to be opposed to each other, and a pair of opposedly arranged, for example, rectangular engaging holes 16f are further formed at a portion of the upper mold portion 16b where the slit 16a is not formed. Further, a ring-shaped locking projection 16e formed in a saw-tooth shape is formed on the peripheral side surface of the lower mold portion 16d of the top mold portion 16 so that the diameter increases as going downward.

The top plug 12 made of metal such as aluminum or stainless steel whose upper end is formed on the top mold portion 16 is a pipe-shaped top plug main body portion 12.
a and a flange 12b formed at the upper end. In the middle of the top plug body portion 12a, a taper portion 12 is provided.
c is formed, so that the top plug body 12
The diameter of the upper part of a is thickened. Then, when a lateral load is applied to the antenna top portion 3, the load is concentrated on the boundary between the top plug 12 and the top mold portion 16,
Since the diameter of the top plug 12 at this boundary is increased, the load resistance can be improved. Thereby, even if a horizontal load is applied to the antenna top portion 3, it is possible to prevent the breakage of the portable wireless device antenna 1.

The cap 11 is fitted into the top mold portion 16.
Is entirely covered by the cap 11.
The cap 11 is formed in a bag-like shape by resin-molding an ABS resin, an elastomer resin, or the like. The inside of the cap main body 11a is a storage chamber 11c in which the top mold portion 16 is stored. A ring-shaped recess 11b is formed on the peripheral surface. Coil element 1
7 is formed by winding a phosphor bronze or stainless steel wire so as to have a predetermined diameter and a predetermined number of turns. At this time, the length of the coil element 17 is formed to be slightly longer than the required length.

Next, a description will be given of a method of manufacturing the portable radio antenna 1 according to the first embodiment of the present invention.
When manufacturing the antenna 1 for a portable wireless device according to the first embodiment of the present invention, a resin molded cap 11 and a resin molded joint 13 on the upper end of a whip element 15 as shown in FIG. And a coil element 17 wound in a coil shape, and a top molded portion 16 integrally formed on the upper end of the top plug 12.
Next, the coil element 17 is stored in the coil element storage section 16c of the top mold section 16, and the joint 13 is inserted into the stored coil element 17 from the whip element 15 side. Thereby, the whip element 15 and the joint 13 are inserted into the coil element 17 and the through hole 12d of the top plug main body 12a, and finally the joint 13 extends from below the through hole 12d of the top plug 12.

At this time, the upper end of the upper mold portion 16b in which the slit 16a is formed is expanded by the flange portion 13a formed at the tip of the joint 13, and the flange portion 13a is formed.
Can be easily inserted into the upper mold part b. Then, a pair of engagement protrusions 13 formed on the flange portion 13a
When d (see FIG. 7 described later) engages with an engagement hole 16f formed in the upper mold portion 16b of the top mold portion 16, the insertion of the joint 13 is stopped. In this state, the coil element 17 is
Between the upper surface of the flange portion 12b and the lower surface of the flange portion 13a of the joint 13. That is, the distance between the upper surface of the flange portion 12b and the lower surface of the flange portion 13a is always constant because the position where the engagement hole 16f is formed is constant, and therefore, the length of the coil element 17 Can be kept substantially constant. As a result, the electrical characteristics of the coil element 17 become substantially constant without variation among the individual portable wireless device antennas 1, and the yield during manufacturing can be improved. When the coil element 17 is sandwiched, the lower surface thereof comes into contact with the upper surface of the flange portion 12b of the top plug 12 to be electrically connected.

Next, the cap 11 is inserted from above the top mold portion 16. Then, the top mold portion 1 is placed in the ring-shaped recess 11b formed in the cap 11.
When the ring-shaped engaging projection 16e formed on the insert 6 is inserted, the cap 11 is fitted into the top mold portion 16. In this case, since the ring-shaped locking projection 16 e has a saw-tooth shape, the fitted cap 11 does not come off from the top mold portion 16. That is, when the cap 11 is fitted to the top mold portion 16, the two are firmly fixed.

Since the outer diameter of the top mold portion 16 and the inner diameter of the cap body 11a are substantially equal, when the cap 11 is fitted into the top mold portion 16, a slit 16a is formed in the upper mold portion 16b. Even if you can not expand. For this reason, even if a load is applied to the antenna top portion 3, the engagement between the engagement hole 16f and the engagement protrusion 13d (see FIG. 7) is not released.
Since the length of the coil element 17 does not change, its electrical characteristics are maintained. Further, as described above, since the antenna top portion 3 can be formed by assembling the parts shown in FIG.
The antenna 1 for a portable wireless device according to the embodiment can be produced without using an adhesive.
Thus, management and work steps required when using the adhesive can be omitted, and the work steps can be simplified. Some of these parts are formed by integral molding. However, since these parts are not insert-molded in a narrow space such as in the top plug 12, their molding is easy and molding defects are hardly generated. become. Further, even if molding failure occurs in the molded part, it is only necessary to discard the part, so that an increase in cost can be suppressed.

Further, since the peripheral side surface of the coil element 17 is protected by the double structure of the cap body 11a and the top mold portion 16, even if a load that crushes the antenna top portion 3 is applied, the antenna top portion 3 Does not change, and the electrical characteristics of the coil element 17 are maintained. In this case, the cap 11 can be made of a resin material having a good touch, and the top mold portion 16 can be made of a resin having a high load resistance. Furthermore, as shown in FIGS. 3 and 4, the coil element 17 is housed in a space and an air layer is interposed therebetween, so that the electrical characteristics of the coil element 17 can be improved.

Next, the detailed configuration of each component is shown in FIGS. FIG. 5 is a diagram showing a configuration of the top mold portion 16 integrally formed on the upper end of the top plug 12,
5A is a top view, FIG. 5B is a cross-sectional view of the plan view, FIG. 5C is a plan view thereof, and FIG. 5D is a side view thereof. It is. As shown in these figures, the top mold portion 16 is formed in a substantially cylindrical shape by molding an ABS resin, an elastomer resin, or the like, and the upper end of the top plug 12 is integrally formed at the time of molding. A flange portion 12 b is formed at the upper end of the pipe-shaped top plug 12, and the upper surface of the flange portion 12 b is exposed in the top mold portion 16. The coil element storage portion 16c formed in the top mold portion 16 is a storage space for the coil element 17, and when stored, the coil element 17 is placed on the upper surface of the flange portion 12b.
Are electrically connected. A pair of U-shaped slits 16a are formed in a mold upper portion 16b of the top mold portion 16.
Are formed. The pair of slits 16a are formed so as to be opposed to each other, and a pair of opposedly arranged, for example, rectangular engaging holes 16f are further formed in the upper mold portion 16b where no slit 16a is formed. Further, a ring-shaped locking projection 16e formed in a saw-tooth shape is formed on the peripheral side surface of the lower mold portion 16d of the top mold portion 16 so that the diameter increases as going downward.

The top plug 12 made of a metal such as aluminum or stainless steel whose top end is formed on the top mold portion 16 is a pipe-shaped top plug main body 12.
a and a flange 12b formed at the upper end. In the middle of the top plug body portion 12a, a taper portion 12 is provided.
c is formed, so that the top plug body 12
The diameter of the upper part of a is thickened. Note that, instead of forming the pair of slits 16a, the cross-sectional shape of the top mold portion 16 may be formed to be elliptical. Even in this case, the engagement protrusion 13d is provided in the engagement hole 16f (see FIG. 7).
When the cap 11 is fitted, the cross-sectional shape of the top mold portion 16 becomes substantially circular, so that after the assembly, the engagement protrusion 13d is formed through the engagement hole 16f (see FIG. 7).
Will not come off. Further, the engagement projection 13d (see FIG. 7) is engaged with the engagement hole 16f, so that the joint 13 and the cap 11 are non-rotatably fixed. This makes it impossible to rotate the antenna top portion 3 with respect to the whip antenna portion 2, thereby preventing an accident of the portable wireless device antenna 1 caused by careless rotation.

FIG. 6 is a view showing the structure of the cap 11, FIG. 6 (a) is a plan view showing a cross section thereof, FIG. 6 (b) is a top view thereof, and FIG. Is a plan view thereof. As shown in these figures, an ABS resin, an elastomer resin, or the like is resin-molded to form a bag-like shape having a substantially circular cross section, and the inside is a storage chamber in which the top mold portion 16 is stored. 11c.
A ring-shaped recess 11b is formed on the inner peripheral surface at the lower part of the storage chamber 11c. The ring-shaped recess 11b is formed by a ring-shaped locking protrusion 16e formed on the top mold portion 16.
Is a part that is locked so as not to come off.

FIG. 7 is a view showing the structure of the joint 13 integrally formed on the upper end of the whip element 15, FIG. 7 (a) is a plan view showing a cross section thereof, and FIG. FIG. 7C is a plan view thereof, FIG. 7C is a top view thereof, and FIG. 7D is a joint 13 shown in FIG.
It is a figure which expands and shows. As shown in these figures, the tip of the whip element 15 constituting the whip antenna unit 2 is fixed to the lower part of the joint 13 by integral molding. At this time, an enlarged deformed portion 15a is formed at the tip of the whip element 15 made of, for example, a superelastic metal to prevent the whip element 15 from coming out of the joint 13. The joint 13 made of resin such as nylon resin or PBT resin is composed of an elongated rod-shaped joint body 13b.
A flange 13a having a substantially circular shape is formed at the tip of the. Further, a pair of engaging projections 13d are formed so as to protrude from opposing edges of the flange 13a. The engagement projection 13 d is formed by
When it is inserted into the inside, it is a projection that engages with an engagement hole 16f formed in the mold upper portion 16b.

Next, a description will be given of a second embodiment according to the antenna for a portable wireless device of the present invention. The overall configuration of the second embodiment of the portable radio antenna according to the present invention is the same as the overall configuration of the first embodiment shown in FIG. 1 described above, and a description thereof will be omitted. The second embodiment of the portable radio antenna according to the present invention also has a feature in its upper configuration. FIG. 8 is a cross-sectional view showing an enlarged configuration of the upper configuration. Is shown in FIG. Hereinafter, a second embodiment of the portable wireless device antenna according to the present invention will be described with reference to FIGS. 8 and 9 by describing a method of manufacturing the antenna, and the first embodiment described above will be described. 10 to FIG.
Will be described with reference to the drawings showing the configuration of each part shown in FIG.

When manufacturing the antenna 1 for a portable wireless device according to the second embodiment of the present invention, a cap 51 formed of resin as shown in FIG. 12 and a whip element 15 as shown in FIG. And a coil element 1 wound in a coil form
7 and a top mold portion 56 integrally formed on the upper end of the top plug 52 as shown in FIG.
Next, the coil element 17 is stored in the coil element storage portion 56c of the top mold portion 56, and the joint 53 is inserted into the stored coil element 17 from the whip element 15 side. As a result, the whip element 15 and the joint body 53b are inserted into the through holes 52d of the coil element 17 and the pipe-shaped top plug body 52a, and finally the joint body 53b is inserted into the top plug 52, It extends from below the main body 52a. In the middle of the top plug body 52a, the tapered portion 52
c is formed.

A joint slit 53e is formed above the joint 53. The joint slit 53e is formed in place of the slit 16a formed in the top mold 16 according to the first embodiment. As shown in FIG. 11, the joint slit portion 53e is formed from the center of the substantially circular flange portion 53a to the upper portion of the joint body 53b. Thereby, the joint 53
The flange 53a formed at the tip of the
When it is inserted into the mold b, the joint slit 53e is contracted and closed, so that the flange 53a is easily inserted into the upper mold part 56b. Then, when the pair of engagement protrusions 53d formed on the flange 53a engage with the engagement holes 56f formed on the upper mold portion 56b of the top mold portion 56, the insertion of the joint 53 is stopped. . In this state, the coil element 17 is sandwiched between the upper surface of the flange 52b of the top plug 52 and the lower surface of the flange 53a of the joint 53. That is,
The distance between the upper surface of the flange portion 52b and the lower surface of the flange portion 53a is always constant since the position where the engagement hole 56f is formed is constant, and therefore, the length of the coil element 17 is approximately equal. It will be fixed. As a result, the electrical characteristics of the coil element 17 become substantially constant without variation among the individual portable wireless device antennas 1, and the yield during manufacturing can be improved. When the coil element 17 is sandwiched, the lower surface thereof is electrically connected to the upper surface of the flange 52b of the top plug 52. The upper mold part 56b is formed in a substantially cylindrical shape, but has no slit.

Next, the cap 51 is inserted from above the top mold portion 56. Then, as shown in FIG. 12, in a ring-shaped concave portion 51b formed in the cap 51,
When the ring-shaped locking projection 56e formed on the peripheral side surface of the lower mold portion 56d of the top mold portion 56 is inserted, the top mold portion 56 is moved to the storage chamber 51 of the cap 51.
c so as to be housed inside. In this case, since the ring-shaped locking projection 56e has a sawtooth shape,
The fitted cap 51 does not come out of the top mold portion 56. That is, the top mold portion 56
By being fitted with the cap 51, the two are firmly fixed. An insertion projection 51d is formed on the inner surface of the tip of the cap 51 so as to protrude downward as shown in the figure. When the cap 51 is fitted into the top mold 56, the insertion projection 51d is formed. Figure 8
And as shown in FIG. 9, it comes to be inserted in the joint slit part 53e. Thus, the joint slit 53e of the joint 53 cannot be contracted or closed by the insertion protrusion 51d of the cap 11. Therefore, even if a load is applied to the antenna top portion 3, the engagement between the engagement hole 56f and the engagement protrusion 53d is not released, and the length of the coil element 17 does not change. Will be maintained.

Further, as described above, the antenna top 3
Can be made by assembling the parts shown in FIGS. 10 to 12, so that the portable radio antenna 1 according to the second embodiment of the present invention can be made without using an adhesive. Become like Thus, management and work steps required when using the adhesive can be omitted, and the work steps can be simplified. Some of these parts are formed by integral molding. However, since these parts are not parts that are insert-molded in a narrow space such as in the top plug 52, the molding is easy and molding defects are hardly generated. become. Further, even if molding failure occurs in the molded part, it is only necessary to discard the part, so that an increase in cost can be suppressed. Further, the coil element 17
Is protected by a double structure of the cap body 51a of the cap 51 and the mold upper portion 56b of the top mold portion 56, so that the shape of the antenna top portion 3 is maintained even if a load that crushes the antenna top portion 3 is applied. Without changing, the electrical characteristics of the coil element 17 are maintained. In this case, the cap 51 can be made of a resin material having a good touch, and the top mold portion 56 can be made of a resin having a high withstand load. Further, as shown in FIGS. 8 and 9, the coil element 17 is housed in a space and an air layer is interposed therebetween, so that the electrical characteristics of the coil element 17 can be improved.

Next, FIGS. 13A and 13B show the configuration of a third embodiment of the antenna for a portable wireless device of the present invention. FIG. 13A is a plan view of a portable wireless device antenna according to the third embodiment, and FIG. 13B is a cross-sectional view thereof. The antenna 100 for a portable wireless device shown in these figures
The antenna is of a type that is not extendable and retractable but is fixedly attached to the wireless device housing. The portable wireless device antenna 100 includes only a coil element 112 as an antenna.
2 is housed in the mold part 111. The molded part 111 is integrally formed on the upper part of the antenna base 102, and has a substantially cylindrical element storage part 111a. The coil element 112 is stored in the element storage section 111a. Metal antenna base 10
A screw portion 102a is formed on the peripheral side surface of the second device 2, and this screw portion 102a can be screwed to the wireless device housing.

The mold portion 111 is formed in a substantially cylindrical shape by molding an ABS resin, an elastomer resin, or the like. Further, a ring-shaped concave portion 102b is formed on a peripheral side surface of the upper portion of the antenna base portion 102, and the molded portion 111 is formed so that the resin is filled in the ring-shaped concave portion 102b, so that the antenna base portion 102 is formed. It is integrated with the mold part 111. Also, the mold part 111 includes a mold upper part 111b and a mold lower part 111d.
, An element storage portion 111a is formed by the upper mold portion 111b. In addition, the lower mold part 1
A ring-shaped locking projection 111e formed in a saw-tooth shape is formed on the peripheral side surface of 11d so that the diameter increases as going downward.

A cap 101 having a bag-like shape is fitted into the mold part 111, and the entire mold part 111 is covered by the cap 101. The cap 101 is formed in a bag-like shape by resin-molding an ABS resin, an elastomer resin, or the like. The inside is a storage chamber in which the mold portion 111 is stored, and a ring-shaped lower inner surface is provided. Recess 101
b is formed. When the ring-shaped engaging protrusion 111e formed on the mold portion 111 is inserted into the ring-shaped concave portion 101b formed on the cap 101, the cap 101 is fitted into the mold portion 111. In this case, since the ring-shaped locking projection 111e has a saw-tooth shape, the cap 101 does not come off from the mold portion 111. That is, when the cap 101 is fitted into the mold portion 111, the two are firmly fixed.

The coil element 112 is formed by winding a wire made of phosphor bronze or stainless steel so as to have a predetermined diameter and a predetermined number of turns. When the cap 101 is fitted into the mold portion 111 in a state where the cap 101 is housed in the element housing portion 111a of the mold portion 111, a ring-shaped protrusion 101c formed to protrude in a ring shape from the inner surface of the upper end of the cap 101. , The upper end of the coil element 112 comes into contact. Accordingly, the coil element 112 is compressed and the length of the coil element 112 is determined by the distance from the upper surface of the antenna base 102 to the lower surface of the ring-shaped protrusion 101c. Here, in each of the antennas 100 for a portable wireless device, since the interval from the upper surface of the antenna base 102 to the lower surface of the ring-shaped protrusion 101c is uniform, the length of the coil element 112 is also uniform. Become. As a result, the electrical characteristics of the coil element 112 are substantially constant without variation among the individual portable wireless device antennas 100, and the production yield can be improved. Note that the coil element 11
2, the lower surface thereof is electrically connected to the upper surface of the antenna base 102 when it is sandwiched.

As described above, the portable wireless device antenna 100 shown in FIG. 13 can be made by assembling parts, so that it can be made without using an adhesive. Thus, management and work steps required when using the adhesive can be omitted, and the work steps can be simplified. Some of these parts are formed by integral molding, but since they are not parts that are insert-molded in a narrow space, molding is easy and molding defects hardly occur. Further, even if molding failure occurs in the molded part, it is only necessary to discard the part, so that an increase in cost can be suppressed. Further, the coil element 112 is formed of the cap 101 and the mold 111.
Since the protection is provided by the heavy structure, the shape of the cap 101 does not change even if a crushing load is applied, and the electrical characteristics of the coil element 112 are maintained. In this case, the cap 101 can be made of a resin material having a good touch, and the mold portion 111 can be made of a resin having a high load resistance. Furthermore, the coil element 112 is housed in a space as shown in FIG.
Can have good electrical characteristics.

When the portable wireless device antennas 1 and 100 of the present invention are used as portable telephone antennas, the whip element 15 and the coil elements 17 and 11 are used.
The electrical length of No. 2 can be, for example, about １ ／ wavelength of the center wavelength in the frequency band used together. By doing so, the impedances of both antennas can be made substantially the same, and the impedance can be made a low impedance that is easy to handle. For this reason, the output impedance of the transmitting / receiving circuit can be made substantially the same as the impedance of both antennas, and the matching circuit provided in the power supply unit can be omitted.

Further, the electrical length of the whip element 15 and the coil elements 17, 112 can be set to about 波長 of the wavelength of the frequency band used together. In this case, since the impedance of both antennas is increased, it is possible to provide a mobile phone antenna which is less likely to be affected by the user. In this case as well, the impedances of both antennas are almost the same, but since the impedance is high, it is necessary to match with the transmitting and receiving circuit by a matching circuit provided in the feeding unit. Further, the electrical length of the whip element 15 and the coil elements 17, 112 is set to about 約 of the wavelength of the frequency band used together so as to simplify the matching circuit in the power supply unit and reduce the influence of the user. Alternatively, it may be about 5/8 wavelength.

However, defining the electrical lengths of the linear antenna and the helical coil antenna to be substantially equal to each other as in the whip element 15 and the coil elements 17 and 112 according to the present invention means that the electric power between the antennas having different shapes is different. It is extremely difficult because a method for measuring length differences has not been established. Therefore, the term “electrical lengths are substantially equal” as used herein means that any antenna is substantially matched to a common power supply unit in a used frequency band, and no inconvenience occurs even when power is supplied by the common power supply unit. Shall mean. The matching may be achieved when the VSWR of the whip element 15 and the coil elements 17, 112 measured within the used frequency band is within a range defined by the VSWR. .

[0048]

As described above, according to the present invention, the cap can be fixed to the mold portion by fitting the cap to the mold portion. That is, since the antenna for the portable wireless device can be produced by assembly without using an adhesive, it is possible to prevent the appearance defect due to the protrusion of the adhesive and to simplify the operation process. it can. As a result, the yield can be improved and the cost can be reduced. In addition, when a projection is formed on the inner surface of the upper end of the cap, which is in contact with the upper end of the coil element, when the cap is fixed to the mold section, the coil element is sandwiched between the mold section and the cap so as to be compressed. Thus, the length can always be a predetermined length. As a result, variations in the electrical characteristics of the coil elements can be suppressed, and the yield can be improved.

Further, since the coil element is accommodated in the space in the mold portion and is not embedded in the dielectric, variation in the electrical characteristics of the coil element can be suppressed, and the yield can be further improved. Furthermore, since the coil element is housed in a substantially cylindrical mold part, and the mold part is further covered with a cap, the coil element is protected by a double structure, and is deformed even when a horizontal load is applied. The coil element can maintain the electrical characteristics of the place for a long time without doing so.

Next, in another embodiment of the present invention described above, an insulative joint formed integrally with the tip of the whip element is connected to the coil element and the top mold part housed in the top mold part. By being inserted into the integrated top plug, a telescopic portable radio antenna in which the coil element is arranged at the upper part and the whip element is arranged at the lower part can be assembled. This portable radio antenna is manufactured by assembling the portable radio antenna without using an adhesive by inserting a joint into the coil element and the top plug and fitting the cap to the top mold portion. Can be. For this reason, it is possible to prevent the appearance failure due to the protrusion of the adhesive, and to simplify the operation process. As a result, the yield can be improved and the cost can be reduced.

Further, if a slit is formed in the upper part of the top mold part, the upper part of the top mold part can be easily expanded when the joint is inserted, and the engaged means formed in the flange part can be engaged. The means can be easily engaged. Thereby, work efficiency can be improved. Further, a tapered portion is formed in the middle of the top plug so that the diameter of the upper portion of the top plug is increased.
The upper portion of the top plug is a boundary portion with the top mold portion, and is a portion to which the lateral load is applied in a concentrated manner. That is, since the diameter of the portion where the load is concentrated is increased,
The load resistance can be improved, and breakage can be prevented.

Furthermore, if a joint slit is formed in the upper part of the joint, the upper part of the joint will be closed and closed when the joint is inserted, and the engaged means formed in the flange will be engaged. It becomes easy to engage with the means. Thereby, work efficiency can be improved. In order to prevent the upper part of the joint from contracting and closing after assembly, a protrusion inserted into the slit may be formed on the inner surface of the tip of the cap.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an overall configuration of a first embodiment of a portable wireless device antenna according to the present invention.

FIG. 2 is an exploded view showing a configuration of an upper portion of the portable radio antenna according to the first embodiment of the present invention.

FIG. 3 is an enlarged cross-sectional view illustrating a configuration of an upper portion of the portable wireless device antenna according to the first embodiment of the present invention.

FIG. 4 is a partial cross-sectional view showing, on an enlarged scale, an upper configuration of the portable wireless device antenna according to the first embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of a top plug and a top mold portion of the antenna for a portable wireless device according to the first embodiment of the present invention.

FIG. 6 is a diagram showing a configuration of a cap of the antenna for a portable wireless device according to the first embodiment of the present invention.

FIG. 7 is a diagram illustrating a configuration of a joint of the antenna for a portable wireless device according to the first embodiment of the present invention.

FIG. 8 is an enlarged cross-sectional view illustrating a configuration of an upper portion of a portable wireless device antenna according to a second embodiment of the present invention.

FIG. 9 is a partial cross-sectional view showing, on an enlarged scale, an upper configuration of an antenna for a portable wireless device according to a second embodiment of the present invention.

FIG. 10 is a diagram showing a configuration of a top plug and a top molded portion of a portable wireless device antenna according to a second embodiment of the present invention.

FIG. 11 is a diagram illustrating a configuration of a joint of an antenna for a portable wireless device according to a second embodiment of the present invention.

FIG. 12 is a diagram illustrating a configuration of a cap of an antenna for a portable wireless device according to a second embodiment of the present invention.

FIGS. 13A and 13B are a plan view and a cross-sectional view illustrating a configuration of a portable wireless device antenna according to a third embodiment of the present invention.

FIG. 14 is a diagram illustrating a configuration example of a conventional antenna for a portable wireless device.

[Explanation of symbols]

1 portable radio antenna, 2 whip antenna,
3 Antenna top part, 4 holder part, 11 cap, 11a cap body, 11b ring-shaped recess, 1
1c storage room, 12 top plug, 12a top plug body, 12b flange, 12c taper, 12d
Through hole, 13 joint, 13a flange, 13b
Joint body, 13c Ring-shaped groove, 13d Engagement projection, 14 Stopper part, 14a Locking part, 15 Whip element, 15a Deformed part, 16 Top molded part, 16a Slit, 16b Mold upper part, 16
c Coil element storage, 16d Mold lower part,
16e ring-shaped locking projection, 16f engagement hole, 17 coil element, 18 insulating tube, 51 cap, 51a cap body, 51b ring-shaped recess,
51c storage chamber, 51d insertion protrusion, 52 top plug, 52a top plug body, 52b flange, 52c
Tapered part, 52d through hole, 53 joint, 53
a flange portion, 53b joint body, 53c ring-shaped groove portion, 53d engagement protrusion, 53e joint slit portion, 56 top mold portion, 56b mold upper portion,
56c Coil element storage, 56d Mold lower part, 56e Ring-shaped locking projection, 56f Engagement hole, 10
0 Antenna for portable radio, 101 Cap, 101
b ring-shaped recess, 101c ring-shaped protrusion, 102
Antenna base, 102a screw, 102b ring-shaped recess, 111 mold, 111a element housing, 111b mold upper, 111d mold lower, 111e ring-shaped locking projection, 112 coil element, 300 portable radio antenna, 310 top , 311 top plug, 312 joint, 3
13 Whip antenna part, 314 antenna holder, 315 stopper part, 315a locking part

Claims (11)

[Claims] 1. A substantially cylindrical mold portion having a housing portion for housing a coil element therein, and a lower end extending from the lower end of the mold portion when housed in the mold portion. The coil element electrically connected to the antenna feeding means, and the coil element is fitted so as to cover the mold part in which the coil element is housed, so that the coil element is fixed to the mold part. An antenna for a portable wireless device, comprising: a cap having a bag-like shape; 2. An antenna for a portable wireless device according to claim 1, wherein a lower portion of said molded portion is molded integrally with an upper portion of said antenna feeding means. 3. A locking means is formed on a peripheral side surface of the mold part, and a locked means is formed on an inner peripheral surface of the cap, and the cap is fitted to the mold part. 2. The portable wireless device according to claim 1, wherein, when combined, the cap is fixed to the mold portion by locking the unlocking means to the locking means. Antenna. 4. A projection protruding from an inner surface of an upper end of the cap is formed, and the projection abuts on an upper end of the coil element when the cap is fitted to the mold portion. 2. The antenna for a portable wireless device according to claim 1, wherein the length of said coil element is defined by an interval between said antenna feeding means and said projection. 5. A linear whip that is slidably held by a holder attachable to a housing of a portable device and whose lower end is electrically connected to the holder when extended with respect to the holder. A whip antenna portion made of an element, and an antenna top portion that accommodates the coil element and that is positioned and fixed substantially uniaxially to the whip antenna portion, wherein the antenna top portion slides on the holder. A pipe-shaped top plug extending from a lower end so as to be movable, and integrally formed on an upper portion of the top plug,
A top mold part in which a housing part for housing the coil element is formed; and a coil element electrically connected to the top plug when housed in the top mold part; A flange portion formed at an upper end portion to hold the coil element therebetween, and extending downward from the flange portion to be integrally formed at a tip of the whip element, wherein the coil element and the top plug are formed. A joint having an insulating joint body inserted therein, and a bag-shaped cap fixed by being fitted to cover the top mold portion. Characteristic antenna for portable radio. 6. An engaging means is formed on an upper portion of said top mold portion, and an engaged means for engaging with said engaging means is formed on said flange portion, said disengaging means being provided on said engaging means. 6. The antenna for a portable wireless device according to claim 5, wherein the length of said coil element is defined as a length from said top plug to said engaging means by being engaged. 7. A locking means is formed on a peripheral side surface of said top mold portion, and a locked means locked by said locking means is formed on an inner circumferential surface of said cap, and said cap is mounted on said top. 6. The cap according to claim 5, wherein the cap is fixed to the top mold portion when the non-locking means is locked by the locking means when fitted to the mold portion. The antenna for a portable radio described in the above. 8. A slit is formed in an upper portion of the top mold portion, and the upper portion of the top mold portion is expanded when the non-engaging means is engaged with the engaging means. The antenna for a portable wireless device according to claim 5, wherein: 9. The portable radio antenna according to claim 5, wherein a tapered portion is formed in the middle of the top plug, and a diameter of an upper portion of the top plug is increased. 10. A joint slit portion is formed at an upper portion of the joint, so that the upper portion of the joint is closed when the non-engaging means is engaged with the engaging means. The antenna for a portable wireless device according to claim 5, wherein: 11. A projecting portion inserted into the joint slit portion formed in the joint is formed on an inner surface of a tip of the cap, and when the cap is fitted to the top mold portion. By inserting the protruding portion into the joint slit portion,
6. The antenna according to claim 5, wherein an upper portion of the joint cannot be closed.