JP2000232313A - Antenna for portable equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of defective appearance or an electrical defect. SOLUTION: Concerning this antenna, a cylindrical top cover 21 is molded at the extended diameter part 30a of a top plug 30; a coil plug 22 where a coil part 22c is formed is inserted to the housing space of the cover 21 and the first projecting part 22a is screwed to the inside of the part 30a. Next, a top cover cap 23 is fitted to the cover 21. By preparing the cover 21 by molding first this way, the molding pressure is not applied to the plug 22 and adverse influence is avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art A portable telephone is provided with an antenna for transmitting and receiving calls and information. This antenna is generally an antenna composed of an expandable and contractible whip-shaped element that can be stored in the housing of a mobile phone so that it is convenient to carry when waiting. However, when the whip-shaped element is stored in the housing, the mobile phone becomes almost impossible to transmit and receive.
A small coil-shaped element located outside the housing is provided at the tip of the whip-shaped element. Thus, when the whip-shaped element is stored in the housing, transmission and reception can be performed using the coil-shaped element.

FIG. 12 shows an example of the configuration of such an antenna for portable equipment, and FIG. 13 is an exploded view of the antenna. FIGS. 12 and 13 show only the configuration of the antenna top portion above the antenna. Is shown. As shown in these figures,
The whip antenna section 112 and the metal-made top plug 130 formed in a pipe shape are arranged uniaxially and insulated and fixed to each other. This fixing is performed by a joint 131 made of resin. The joint 131 holds the tip of the whip antenna unit 112 and is insert-molded so as to pass through the inside of the top plug 130. The upper portion of the top plug 130 is an enlarged diameter portion 130a, and a joint 1 is provided below the enlarged diameter portion 130a.
The enlarged tip 131a of the 31 is engaged. Thus, the top plug 130 is firmly fixed to the tip of the whip antenna section 112 via the joint 131 without coming off.

[0004] The enlarged diameter portion 130 of the top plug 130
A projection 102a formed at the lower end of the coil plug 102 is fitted and fixed to a. The coil plug 102 is formed in a cylindrical shape, and a helical groove is formed in a peripheral portion thereof. A helical coil portion 102b is formed by forming a conductive film in this groove. This coil portion 102b is a coil-shaped element. The coil plug 102 is formed by molding, and is made of synthetic resin. And coil plug 1
02 is fixed to the top plug 130,
A resin top cover 101 is formed to cover the entire surface of the coil plug 102 and the enlarged diameter portion 130a of the top plug 130. As shown in FIG. 13, a screw portion is formed on the inner peripheral surface of the enlarged diameter portion 130a at the tip of the top plug 130, and a coil plug screw portion is formed on the projected portion 102a of the coil plug 102. , The coil plug 102 may be fixed.

The reason why the whip antenna section 112 and the top plug 130 are insulated by the joint 131 is to operate the whip antenna section 112 and the coil section 102b as independent antennas. That is, when a capacitance is generated between the top plug 130, which is a feeding unit of the coil unit 102b, and the whip antenna unit 112, the coil unit 102b and the whip antenna unit 112 are electrically coupled to each other. Has an adverse effect on the operation of. In order to prevent this, a joint 131 is provided so that the coil unit 102b and the whip antenna unit 112 are sufficiently separated from each other so that no capacitance is generated.

[0006]

In the portable device antenna having the antenna top portion shown in FIGS. 12 and 13, the projecting portion 1 of the coil plug 102 is provided as described above.
In a state where 02a is fixed to the enlarged diameter portion 130a of the top plug 130, a resin top cover 101 is formed so as to cover the entire surface of the coil plug 102 and the enlarged diameter portion 130a of the top plug 130. During this molding, the molten high-temperature resin material comes into direct contact with the coil plug 102 and the molding pressure of the resin
2 will be applied. That is, the coil plug 1
Since 02 is a molded product, the coil plug 102 softened by the heat of the resin material receives a molding pressure. Then, when the top cover 101 is molded, the coil plug 102 which has been subjected to the molding pressure is molded in an inclined state in the top cover 101, resulting in poor appearance or the coil portion 10 formed in the coil plug 102.
There is a problem that the electrical characteristics are poor due to disconnection of 2b.

[0007] Such a problem is not limited to the coil plug 102 made of resin, but also occurs when a coil-shaped element is formed by a coil formed of a conductive wire. That is, the coil formed by the conductive wire is the top plug 1
30 is supported by a resin core portion fixed to the enlarged diameter portion 130a of the base member 30. When the top cover 101 is formed, the core portion may be tilted due to molding heat and molding pressure, and may be tilted. This is because the electrical contact between the coil and the top plug 130 may be interrupted. Therefore, an object of the present invention is to provide an antenna for a portable device that does not cause a poor appearance or an electrical defect even when a top cover that covers a coil-shaped element portion is provided on an antenna top portion.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an antenna for a portable device of the present invention is slidably held by a holder attachable to a housing of the portable device. The whip antenna section, the lower end of which is electrically connected to the holder when extended, the antenna top section in which the coil element section is housed, and the coil element section are electrically connected. Along with the antenna top portion, the top plug has a substantially pipe shape and is slidable on the holder, and the top plug and the whip antenna portion are substantially uniaxially positioned. An insulating jaw penetrating through the top plug and holding the tip of the whip antenna portion so as to be insulated and fixed to each other. And the antenna top portion is at least composed of a cylindrical top cover fixed to cover the enlarged diameter portion formed on the top plug and the coil-shaped element portion. After the top cover is formed into the enlarged diameter portion, the coil-shaped element portion is mounted in the top cover.

In the portable device antenna according to the present invention, the coil-shaped element portion may be formed by winding a conductive wire in a coil shape. Further, in the mobile device antenna of the present invention, the coil-shaped element portion is formed by forming a conductive film in a helical shape on a peripheral side portion of the cylindrical insulator,
A projection formed at the lower end may be fixed in the enlarged diameter portion of the top plug. Still further, in the portable device antenna according to the present invention, in a state where the coil-shaped element is mounted in the top cover,
A top cover cap may be fixed to an upper part of the top cover. Furthermore, in the antenna for a portable device of the present invention, the top cover is screwed to an outer periphery of the enlarged diameter portion of the top plug, instead of the top cover being molded to the enlarged diameter portion. May be fixed.

Further, in the portable device antenna according to the present invention, the top cover may be colored or plated. Further, in the portable device antenna according to the present invention, the top cover and the top cover cap may be provided. May be independently colored or plated.

According to the present invention, since the top cover for covering the coil-shaped element portion is fixed to the antenna top portion, the coil-shaped element portion can be mounted in the top cover after being fixed to the antenna top portion. Even if the top cover is formed on the antenna top by molding, the coil-shaped element can be prevented from tilting. Further, even when the coil portion of the coil-shaped element is formed of a conductive film, the antenna top portion can be assembled without disconnection. In addition, since coloring of various colors and plating of metallic luster can be applied to the top cover, an antenna for a portable device that matches the design and color of the housing of the portable device can be obtained. Further, in the case where the top cover cap is fixed to the top cover, the color and plating of the top cover and the top cover cap can be arbitrarily set, and various combinations can be made.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of the configuration of an embodiment of the antenna for portable equipment according to the present invention. FIG. 1 is a partial cross-sectional view in a case where the mobile device antenna of the present invention is applied to a mobile phone antenna. As shown in FIG. 1, an antenna 1 for a mobile phone according to an embodiment of the present invention includes an antenna top portion 10, a connection portion 11 connecting the antenna top portion 10 and the whip antenna portion 12, and an antenna having a connection portion 11. Consisting of a whip antenna section 12 fixed substantially coaxially with the top section 10, a stopper section 13 fixed to a lower end of the whip antenna section 12, and a holder section 14 slidably provided on the whip antenna section 12. Have been.

In the mobile phone antenna 1 configured as described above, the metal holder 14 is attached to the housing of the mobile phone, and when the whip antenna 12 is extended with respect to the holder 14, The stopper portion 13 is inserted and held in the portion 14 from below, and the whip antenna portion 12 is electrically connected to the holder portion 14. As a result, only the whip antenna unit 12 is in the operating state.
When the whip antenna section 12 is housed in the housing, the connecting section 11 is inserted and held in the holder section 14 from above, and a top plug described later in the connecting section 11 is electrically connected to the holder section 14. As a result, only the coil-shaped element connected to the top plug and housed in the antenna top portion 10 is in the operating state. Therefore, when the mobile phone antenna 1 according to the present invention is extended, transmission and reception can be performed at a high gain using the whip antenna section 12, and when the mobile phone antenna 1 is stored, the antenna inside the antenna top section 10 can be used. Transmission and reception can be performed using the coil-shaped element.

The whip antenna section 12 is composed of a whip element made of a linear conductive wire made of a superelastic metal or the like, and a synthetic resin tube covering the whip element. The upper end of this tube is inserted into the joint part of the connection part 11,
The lower end is inserted and fixed in the stopper portion 13. The upper end of the whip element made of a conductive wire is formed integrally with the joint, but an enlarged portion is formed at the upper end of the whip element to prevent the whip element from coming off. The lower end of the whip element is caulked to the stopper portion 13 and is electrically and mechanically fixed.

Next, FIGS. 2 and 3 show a detailed configuration of a first example of the antenna top portion 10 in the mobile phone antenna 1 according to the present invention. However, FIG. 2 shows a partial cross-sectional view of the antenna top portion 10 and the connecting portion 11, and FIG. 3 shows an exploded view thereof. As shown in FIGS. 2 and 3, the whip antenna section 12 and the substantially pipe-shaped metal top plug 30 are arranged uniaxially and insulated and fixed to each other. This fixing is performed by a joint 31 made of resin. The joint 31 is formed so as to hold the tip of the whip antenna unit 12 and is insert-molded so as to penetrate the inside of the top plug 30. An enlarged diameter portion 30a is formed at the upper portion of the top plug 30. An enlarged tip portion 31a of the joint 31 is formed at a lower portion inside the enlarged diameter portion 30a.
Are engaged. Thereby, the whip antenna unit 1
The top plug 30 is firmly fixed to the front end of the base 2 via the joint 31 without coming off.

A first protruding portion 22a formed at the lower end of the coil plug 22 is fixed to the enlarged diameter portion 30a of the top plug 30 by screwing. The coil plug 22 has a cylindrical shape, and a helical groove is formed on a peripheral side thereof. A helical coil portion 22c is formed by forming a conductive film in this groove. This coil part 22c operates as a coil-shaped element.
This coil plug 22 is formed by resin molding, and has a threaded portion having a small diameter at the lower end on the peripheral side surface.
A projection 22a is formed, and a second projection 22b having a small diameter is formed at the upper end. A resin top cover 21 is provided so as to cover the entire surface of the coil plug 22 and the enlarged diameter portion 30 a of the top plug 30.

The top cover 21 is formed together with the joint 31 on the top plug 30 so as to cover the enlarged diameter portion 30a of the top plug 30, as shown in FIG. Then, the coil plug 22 is inserted from above into a cylindrical internal storage space extending upward from the top plug 30. Next, the first projecting portion 22 a formed at the lower end of the coil plug 22 is connected to the enlarged diameter portion 30 a of the top plug 30.
It is screwed and fixed inside. Thereby, the coil plug 22 is stored in the top cover 21. Further, a ring-shaped protruding portion 23a formed so as to protrude from the lower surface of the top cover cap 23 is fitted into a thin portion 21b formed on the upper inner surface of the top cover 21, and is fixed to the top cover 21 by bonding or welding. Is done. As shown in FIG. 1, the second protrusion 22 b of the coil plug 22 is fitted into the top cover cap 23, and the top cover 21, the coil plug 22, the top cover cap 23
Are fixed so as to be integrated.

The lower end 21a of the top cover 21
Is engaged with the stepped outer surface of the enlarged diameter portion 30a as shown in the figure, so that the top cover 21 does not fall out of the top plug 30 upward. Further, the top cover cap 23 is fixed to the upper part,
Since the coil plug 22 is housed in the inside 1 in close contact, the top cover 21 does not fall out from the top plug 30 downward. In addition, the first of the coil plug 22
A screw portion is formed on the peripheral side surface of the protruding portion 22a, and is screwed to a screw portion formed on the inner peripheral surface of the enlarged diameter portion 30a of the top plug 30. 1 The protruding portion 22a is connected to the enlarged diameter portion 30a
It may be press-fitted or bonded inside.

The reason why the whip antenna section 12 and the top plug 30 are fixed by the joint 31 is as follows.
This is because the whip antenna unit 12 and the coil-shaped element including the coil unit 22c operate as independent antennas. That is, when a capacitance is generated between the top plug 30 serving as a power supply unit of the coil unit 22c and the whip antenna unit 12, the coil unit 22c and the whip antenna unit 12 are electrically coupled to each other. Has an adverse effect on the operation of. In order to prevent this, the coil joint 22c and the whip antenna unit 12 are sufficiently separated from each other, and an insulating joint 31 is provided so as not to generate capacitance. further,
The top cover 21 and the top cover cap 23 can be colored with an arbitrary color or plated with a metallic luster. In this case, the color and the mode of plating may be different.

Next, FIGS. 4 and 5 show a detailed configuration of a second example of the antenna top portion 10 in the mobile phone antenna 1 according to the present invention. However, FIG. 4 shows a partial sectional view of the antenna top portion 10 and the connecting portion 11, and FIG. 5 shows an exploded view thereof. As shown in FIGS. 4 and 5, the whip antenna unit 12 and the substantially pipe-shaped metal top plug 30 are arranged uniaxially and insulated and fixed to each other. This fixing is performed by a joint 31 made of resin. The joint 31 is formed so as to hold the tip of the whip antenna unit 12 and is insert-molded so as to penetrate the inside of the top plug 30. An enlarged diameter portion 30a is formed at the upper portion of the top plug 30. An enlarged tip portion 31a of the joint 31 is formed at a lower portion inside the enlarged diameter portion 30a.
Are engaged. Thereby, the whip antenna unit 1
The top plug 30 is firmly fixed to the front end of the base 2 via the joint 31 without coming off.

A first protruding portion 41a formed at the lower end of the coil plug 41 is press-fitted and fixed to the enlarged diameter portion 30a of the top plug 30. The coil plug 41 has a cylindrical shape, and a helical groove is formed on a peripheral side thereof. A helical coil portion 41c is formed by forming a conductive film in this groove. This coil part 41c operates as a coil-shaped element.
The coil plug 41 is formed by resin molding, has a first projection 41a having a small diameter at a lower end, and a head 41b having a swelled tip at an upper end. . The resin top cover 21 is provided so as to cover all parts of the coil plug 41 except the head 41 b and the enlarged diameter portion 30 a of the top plug 30.

The top cover 21 is formed together with the joint 31 on the top plug 30 so as to cover the enlarged diameter portion 30a of the top plug 30, as shown in FIG. Then, the coil plug 41 is inserted into the cylindrical storage space extending upward from the top plug 30 from above. Next, the first protruding portion 41 a formed at the lower end of the coil plug 41 is pressed into the enlarged diameter portion 30 a of the top plug 30 and fixed. At this time, the lower surface of the head 41b of the coil plug 41 is in contact with the upper end of the top cover 21, and the upper part of the coil plug 41 is press-fitted or fitted into the thin portion 21b formed on the inner surface of the top cover 21. Then, it is fixed to the top cover 21 by bonding or welding. Thereby, the top cover 21
The coil plug 41 is housed inside, and the top cover 21,
In order for the coil plug 41 to be integrated, the top plug 30
Can be fixed to the surface.

The lower end 21a of the top cover 21
Is engaged with the stepped outer surface of the enlarged diameter portion 30a as shown in the figure, so that the top cover 21 does not fall out of the top plug 30 upward. Further, since the upper portion of the coil plug 41 and the thin portion 21b of the top cover 21 are fixed, the top cover 21 does not fall out of the top plug 30. Further, a screw portion is formed on the peripheral side surface of the first projecting portion 41a of the coil plug 41, and a screw portion is formed on the inner peripheral surface of the enlarged diameter portion 30a of the top plug 30, so that the first projecting portion 41a is enlarged in diameter. Part 30
The coil plug 41 may be fixed to the top plug 30 by screwing to the top plug 30. Further, the top cover 21 and the coil plug 41 can be colored with an arbitrary color or plated with a metallic luster. in this case,
The color and the mode of plating may be different.

Next, a detailed configuration of a third example of the antenna top portion 10 in the mobile phone antenna 1 according to the present invention is shown in FIGS. 6 shows a partial cross-sectional view of the antenna top portion 10 and the connecting portion 11, and FIG. 7 shows an exploded view thereof. As shown in FIGS. 6 and 7, the whip antenna section 12 and the substantially pipe-shaped metal top plug 30 are uniaxially arranged and insulated and fixed to each other. This fixing is performed by a joint 31 made of resin. The joint 31 is formed so as to hold the tip of the whip antenna unit 12 and is insert-molded so as to penetrate the inside of the top plug 30. An enlarged diameter portion 30a is formed at the upper portion of the top plug 30. An enlarged tip portion 31a of the joint 31 is formed at a lower portion inside the enlarged diameter portion 30a.
Are engaged. Thereby, the whip antenna unit 1
The top plug 30 is firmly fixed to the front end of the base 2 via the joint 31 without coming off.

A first protruding portion 42a formed at the lower end of the coil plug 42 is press-fitted and screwed into the enlarged diameter portion 30a of the top plug 30. The coil plug 42 has a cylindrical shape, and a helical groove is formed on a peripheral side thereof. A helical coil portion 42c is formed by forming a conductive film in this groove. This coil part 42c operates as a coil-shaped element.
The coil plug 42 is formed by resin molding, has a first projection 42a having a small diameter at a lower end, and a head 42b with a swelled tip at an upper end. . A resin top cover 43 is provided so as to cover all parts of the coil plug 42 except the head 42 b and the enlarged diameter portion 30 a of the top plug 30.

The top cover 43 is formed in a cylindrical shape as shown in FIG. 7, and a top cover screw portion 43a is formed at a lower portion of an inner peripheral surface thereof. Top plug 3
A screw portion is also formed on the outer peripheral surface of the 0-diameter enlarged portion 30a. Then, the top cover 43 is attached to the whip antenna unit 1.
2, the top cover screw portion 43a is screwed to a screw portion formed on the outer periphery of the enlarged diameter portion 30a of the top plug 30. Next, the coil plug 42 is inserted from above into the storage space of the cylindrical top cover 43 extending upward from the top plug 30. Next, the first protruding portion 42 a formed at the lower end of the coil plug 42 is screwed and fixed inside the enlarged diameter portion 30 a of the top plug 30. At this time, the lower surface of the head 42 b of the coil plug 42 is in contact with the upper end of the top cover 43. As a result, the coil plug 4
2 can be housed and fixed to the top plug 30 so that the top cover 43 and the coil plug 42 are integrated.

The first projecting portion 42 of the coil plug 42
After screwing a into the enlarged diameter portion 30a of the top plug 30,
The top cover screw portion 43a of the top cover 43 may be screwed to the enlarged diameter portion 30a of the top plug 30. Also, without forming a threaded portion on the first protrusion 41a of the coil plug 42, the enlarged diameter portion 30 of the top plug 30
It may be fixed by being press-fitted into a. Further, the top cover 43 and the coil plug 42 can be colored with an arbitrary color or plated with a luster. In this case, the color and the mode of plating may be different.

Next, FIGS. 8 and 9 show a detailed configuration of a fourth example of the antenna top portion 10 in the mobile phone antenna 1 according to the present invention. However, FIG. 8 shows a partial cross-sectional view of the antenna top portion 10 and the connecting portion 11, and FIG. 9 shows an exploded view thereof. The configuration of the fourth example is shown in FIG.
The configuration of the top cover cap is the same as that of the first example shown in FIG. 2 except for a portion related to the top cover cap. Therefore, the configuration of the fourth top cover cap and the configuration of only the portion related to the top cover cap will be described below.

As shown in FIGS. 8 and 9, a top cover cap 44 is fitted on the top of the top cover 21. The top cover cap 44 has a ring-shaped protrusion 44a formed from the lower surface thereof, an engagement portion 44b is formed inside the tip of the protrusion 44a, and a step portion 44c is formed at a root portion. Have been. A second protruding portion 45b is formed on an upper portion of the coil plug 45, and a lower portion of the second protruding portion 45b is formed as a small-diameter portion 45d to form a step portion. Therefore, when the top cover cap 44 is fitted from above the top cover 46 in a state where the coil plug 45 is fixed in the top cover 46 formed on the enlarged diameter portion 30a of the top plug 30, the protrusion of the top cover cap 44 is formed. 44a is press-fitted into the first fitting portion 46b on the upper inner peripheral surface of the top cover 46, and the step portion 44c is fitted into the second fitting portion 46c formed on the upper end of the inner peripheral surface of the top cover 46. You. Further, an engaging portion 44b formed at the tip of the protruding portion 44a
Is engaged with the step at the boundary between the second protrusion 45b and the small diameter portion 45d. As a result, the top cover cap 44 is fixed so as to be integrated with the coil plug 45 without falling out of the top cover 46.

The first protrusion 45 of the coil plug 45
a, the first projecting portion of the coil plug 45 may be formed by screwing on the threaded portion formed on the inner peripheral surface of the enlarged diameter portion 30a of the top plug 30. 45
a may be fixed to the enlarged diameter portion 30a of the top plug 30 by press fitting or bonding. Further, the top cover 46 and the top cover cap 44 can be colored with an arbitrary color or plated with a metallic luster. In this case, the color and the mode of plating may be different.

Next, FIGS. 10 and 11 show a detailed configuration of a fifth example of the antenna top portion 10 in the mobile phone antenna 1 according to the present invention. However, FIG. 10 shows a partial cross-sectional view of the antenna top part 10 and the connecting part 11, and FIG. 11 shows an exploded view thereof. 10 and 11
As shown in (1), the whip antenna section 12 and the metal-made top plug 30 having a substantially pipe shape are arranged on one axis and insulated and fixed to each other. This fixing is performed by a joint 31 made of resin. The joint 31 is formed so as to hold the tip of the whip antenna unit 12 and is insert-molded so as to penetrate the inside of the top plug 30. An enlarged diameter portion 30 a having an enlarged diameter is formed on the upper portion of the top plug 30.
The enlarged and formed front end portion 31a of the joint 31 is engaged with the lower portion inside 0a. As a result, the top plug 30 is firmly fixed to the tip of the whip antenna section 12 via the joint 31 without coming off.

A first protruding portion 50b formed at the lower end of the coil plug 50 is fixed to the enlarged diameter portion 30a of the top plug 30 by screwing. The coil plug 50 has a columnar shape, and has a swelled head 50a formed at the tip thereof. When the coil plug 50 is screwed into the enlarged diameter portion 30a, the coil plug 50 is screwed into the enlarged diameter portion 30a after being fitted into a coil element 51 formed of a conductive wire. As a result, the lower end of the coil element 51 comes into electrical contact with the tip of the enlarged diameter portion 30a of the metal top plug 30, and the coil element 51 is connected to the power supply unit via the top plug 30. become. The coil plug 50 is made by resin molding. In addition, the coil element 51 is formed of a conductive wire having elasticity, and is sandwiched between the head portion 50a of the coil plug 50 and the enlarged diameter portion 30a in a state where the coil element 51 is pressed, so that the coil element 51 can be securely inserted. Then, it comes into electrical contact with the top plug 30.

When the coil element 51 is
0, the resin top cover 52 is electrically and mechanically fixed to the top plug 30 and then the resin top cover 52 is
0 is screwed onto the outer peripheral surface of the enlarged diameter portion 30a. At this time, the top end of the top cover 52 is
The coil element 51 and the head 50a
Are covered by the top cover 52. This top cover 52 is shown in FIG.
As shown in FIG. 1, a top cover screw portion 52a is formed at a lower portion of an inner peripheral surface of the cylindrical shape. The top cover screw portion 52a is a screw portion that is screwed to a screw portion formed on the outer peripheral surface of the enlarged diameter portion 30a of the top plug 30. A screw portion is formed on the peripheral side surface of the first protruding portion 50b of the coil plug 50, and is screwed to a screw portion formed on the inner peripheral surface of the enlarged diameter portion 30a of the top plug 30. The first protrusion 50 of the coil plug 50
b may be pressed into or adhered to the enlarged diameter portion 30a of the top plug 30.

The coil plug 50 is connected to the top plug 3
The top cover 52 is fixed to the enlarged diameter portion 30a of the top plug 30 before being fixed to the enlarged diameter portion 30a.
0 may be fixed to the enlarged diameter portion 30a of the top plug 30. Further, the top cover 52 and the coil plug 50 can be colored with an arbitrary color or plated with a metallic luster. In this case, the color and the mode of plating may be different.

By the way, the mobile phone antenna 1 of the present invention
In the above, assuming that the electrical length of the coil-shaped element or the helical antenna formed of the coil element housed in the whip antenna section 12 and the antenna top section 10 is about １ ／ of the wavelength of the frequency band to be used,
The impedance of both antennas can be made substantially the same, and the impedance becomes low. 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, if the electric length of the helical antenna housed in the whip antenna unit 12 and the antenna top unit 10 is set to about 波長 of the wavelength of the frequency band to be used, the impedance of both antennas increases, so that the user's impedance becomes high. The mobile phone antenna 1 is less likely to be affected. 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, a frequency using the electric length of the helical antenna housed in the whip antenna unit 12 and the antenna top unit 10 is used so that the matching circuit in the feeding unit is simplified and the influence of the user is reduced. It may be about 3/8 wavelength or about 5/8 wavelength of the band wavelength. With any of the above electrical lengths, the impedance of the whip antenna section 12 and the impedance of the helical antenna housed in the antenna top section 10 are almost the same, and any one of the antennas is provided by a common feeding section. Power supply. In the above description, a description has been given of a mobile phone antenna. However, the present invention is not limited to this, and can be applied to any mobile device having a transceiver.

In the portable device provided with the portable device antenna of the present invention, transmission and reception can be performed using the helical antenna housed in the whip antenna unit 12 or the antenna top unit 10. The resonance frequencies of the helical antennas housed in the antenna 12 and the antenna top part 10 need not always be the same. At this time, the same applies to the case where independent frequency bands are assigned as the transmission frequency band and the reception frequency band. In the mobile device antenna of the present invention, the helical antenna housed in the whip antenna unit 12 and the antenna top unit 10 requires at least the transmission frequency band and the reception frequency band assigned to the mobile device. That is, in a frequency band including the common power supply unit, they can be operated together. The electrical lengths of the helical antennas housed in the whip antenna unit 12 and the antenna top unit 10 are expressed with “about” so as to include a transmission frequency band and a reception frequency band of a predetermined bandwidth. I am trying to do it.

[0038]

As described above, according to the present invention, after the top cover for covering the coil-shaped element portion is fixed to the antenna top portion, the coil-shaped element portion can be mounted in the top cover after being fixed to the antenna top portion. Even if the top cover is formed on the antenna top by molding, the coil element can be prevented from tilting. Further, even when the coil portion of the coil-shaped element is formed of a conductive film, the antenna top portion can be assembled without disconnection. In addition, since coloring of various colors and plating of metallic luster can be applied to the top cover, an antenna for a portable device that matches the design and color of the housing of the portable device can be obtained. Further, in the case where the top cover cap is fixed to the top cover, the color and plating of the top cover and the top cover cap can be arbitrarily set, and various combinations can be made.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view illustrating a configuration example of an embodiment of a mobile device antenna according to the present invention.

FIG. 2 is a diagram illustrating a mobile phone antenna according to the present invention;
FIG. 3 is a diagram illustrating a detailed configuration of a first example of an antenna top unit.

FIG. 3 is a diagram illustrating a mobile phone antenna according to the present invention;
FIG. 3 is an exploded view showing a detailed configuration of a first example of an antenna top section.

FIG. 4 is a diagram illustrating a mobile phone antenna according to the present invention;
It is a figure showing the detailed composition of the 2nd example of an antenna top part.

FIG. 5 is a diagram illustrating a mobile phone antenna according to the present invention;
It is an exploded view showing a detailed configuration of a second example of the antenna top portion.

FIG. 6 is a diagram illustrating a mobile phone antenna according to the present invention;
It is a figure showing the detailed composition of the 3rd example of an antenna top part.

FIG. 7 is a diagram illustrating a mobile phone antenna according to the present invention;
It is an exploded view showing a detailed configuration of a third example of the antenna top section.

FIG. 8 is a diagram illustrating a mobile phone antenna according to the present invention;
It is a figure showing the detailed composition of the 4th example of an antenna top part.

FIG. 9 is a diagram illustrating a mobile phone antenna according to the present invention;
It is an exploded view showing a detailed configuration of a fourth example of the antenna top portion.

FIG. 10 is a diagram showing a detailed configuration of a fifth example of the antenna top portion in the mobile phone antenna according to the present invention.

FIG. 11 is an exploded view showing a detailed configuration of a fifth example of the antenna top portion in the mobile phone antenna according to the present invention.

FIG. 12 is a diagram showing a configuration of an antenna top portion in a conventional portable device antenna.

FIG. 13 is an exploded view showing a configuration of an antenna top portion in a conventional portable device antenna.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antenna for mobile telephones 10 Antenna top part 11 Connecting part 12,112 Whip antenna part 13 Stopper part 14 Holder part 21,43,46,52,101 Top cover 21b Lower end part 22,42,45,50,102 Coil plug 22a , 42a, 44a, 45a, 50b First protruding portion 22b, 44b, 45b Second protruding portion 22c, 41c, 42c, 45c, 102b Coil portion 23, 44 Top cover cap 30, 130 Top plug 30a, 130a Large diameter portion 31 , 131 Joint 31a, 131a Tip 41 Coil plug 41a First protrusion 41b, 42b, 50a Head 43a, 52a Top cover screw 44c Step 45d Small diameter 46b First fitting 46c Second fitting 51 Coil element 102a protruding

Claims (7)

[Claims] A whip antenna portion slidably held by a holder attachable to a housing of the portable device and having a lower end electrically connected to the holder when extended with respect to the holder; An antenna top portion in which the coil-shaped element portion is housed, and electrically connected to the coil-shaped element portion, extending from the antenna top portion to the outside, and slidable by the holder. A substantially pipe-shaped top plug, and the top plug and the whip antenna portion are positioned substantially uniaxially, penetrate through the top plug so as to be insulated and fixed to each other, and An insulating joint formed so as to hold a tip of the whip antenna portion, wherein the antenna top portion is formed above the top plug. And at least a coil-shaped element portion that is fixed so as to cover the enlarged diameter portion, and the top cover is formed after the top cover is molded into the enlarged diameter portion. An antenna for a portable device, wherein the coil-shaped element portion is mounted therein. 2. The portable device antenna according to claim 1, wherein the coil-shaped element portion is formed by winding a conductive wire in a coil shape. 3. The coil-shaped element portion is formed by forming a conductive film in a helical shape on a peripheral side portion of a columnar insulator, and a protruding portion formed at a lower end portion of the coil-shaped element portion is formed on the top portion. 2. The portable device antenna according to claim 1, wherein the antenna is fixed in the enlarged diameter portion of the plug. 4. The portable device antenna according to claim 1, wherein a top cover cap is fixed to an upper portion of the top cover in a state where the coiled element is mounted in the top cover. 5. The top cover is fixed to the outer periphery of the enlarged diameter portion of the top plug by screwing, instead of being formed into the enlarged diameter portion. The antenna for a portable device according to claim 1. 6. The antenna for a portable device according to claim 1, wherein the top cover is colored or plated. 7. The antenna for a portable device according to claim 4, wherein said top cover and said top cover cap are independently colored or plated.