JP2000307318A - Antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a sense of touch from being lost in the case of extending/ retracting an antenna for a mobile radio unit and to avoid the outward appearance of the antenna from being degraded. SOLUTION: Leg contacts 21B, 21C are extended upward and downward from an edge of a middle contact 21A that elastically contacts a conductive spring 21 interconnecting an antenna 15 and an electric circuit of the radio unit with an outer circumference of a feeding metallic fixture in a form of a torus strip with a prescribed width when the antenna 15 is in a contained state and the leg contacts 21B, 21C are in elastic contact with an inner circumferential face of a holder 11 by forming the tips of the leg contacts 21B, 21C so that they are externally spread. Thus, only one seam of the torus strips of the middle contact 21A of the conductive spring 21 is used, a damage given to the outer circumferential face of the feeding metallic fixture caused by friction between the feeding metallic fixture 8 and the conductive spring 21 is suppressed when the antenna is turned so as to prevent a sense of touch from being lost in the case of extending/containing the antenna for the mobile radio unit and to avoid quality of the outward appearance of the antenna from being degraded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an antenna for a mobile station mainly used in mobile radio.

[0002]

2. Description of the Related Art In recent years, portable radios such as cellular phones and PHSs have become widespread. These radios are provided with antennas for transmitting and receiving radio waves. In many cases, there are used a first antenna unit that operates when the wireless communication device is configured and a second antenna unit that operates when the wireless communication device is housed in a housing of a wireless device for convenience of carrying.

[0003] Such a conventional antenna will be described with reference to the drawings.

FIG. 6 is a front sectional view of a conventional antenna, and FIG.
Is an exploded perspective view of the same, in which 1 is a first antenna element made of a linear metal round wire, 2 is a resin tube covering the outer periphery of the first antenna element 1,
A metal round bar-shaped stopper 3 is coupled to the lower end of the first antenna element 1, and a resin joint 4 is molded and fixed to the upper end to form a first antenna section 5.

[0005] Reference numeral 6 denotes a second antenna element formed by winding a good conductive metal wire such as copper or a copper alloy into a coil, 7 denotes a resin bobbin around which the second antenna element 6 is wound, and 8 denotes a metal bobbin. The lower end of the second antenna element 6 is wound around the upper end of the power supply fitting 8 and electrically connected thereto by a round bar-shaped power supply fitting, and the outer periphery thereof is covered with a resin cover 9 to form a second antenna unit 10. The joint 4 is inserted and fixed to the lower end of the power supply fitting 8 so that the first antenna 5
And the second antenna unit 10 are combined to form the antenna 15.

Reference numeral 11 denotes a metal-made, substantially cylindrical holder having an antenna insertion hole 11A through which the first antenna element 1 is inserted. The metal holder 11 is accommodated in an elastic contact with an inner peripheral surface of an accommodation hole 11B in the holder 11. Reference numeral 12 denotes a conductive spring made of an elastic metal plate formed into a substantially cylindrical shape.
Numeral 2 is a ring-shaped portion 12A whose upper and lower ends have a narrow width, and a middle portion thereof has a plurality of slits 12B in the cylindrical axis direction, and has a conical shape in which the central portion in the vertical direction is narrowed down narrowly.

In the state of FIG. 6 in which the antenna 15 is extended, the central portion of the conductive spring 12 housed in the housing hole 11B is connected to the lower end of the first antenna element 1 by the outer periphery of the round bar-shaped stopper 3. A power supply nut 13 connected to an electric circuit (not shown) of the wireless device is screwed into a screw thread 11C formed on the outer periphery of the holder 11 so as to elastically contact the surface, and the holder 11 becomes a housing 14 of the wireless device. And the first antenna element 1 and the feeding nut 13 are electrically connected.

In the state of FIG. 6 in which the antenna 15 configured as described above is extended, radio waves are transmitted and received by the first antenna element 1 connected to the electric circuit of the radio via the feeding nut 13, and the first antenna In a state where the element 1 is housed in the housing 14 of the wireless device, the retaining member 3 coupled to the first antenna element 1 is pushed into the wireless device to be separated from the holder 11, and the center of the conductive spring 12 in the holder 11. When the inner surface of the portion is in elastic contact with the outer peripheral surface of the round bar-shaped power supply fitting 8 at the lower end of the second antenna element 6, the second antenna element 6 is connected to an electric circuit to transmit and receive radio waves.

[0009]

However, the antenna used in the above-mentioned conventional portable radio device is small in size and size.
Because of the need for light weight, it is required to have a small diameter and a high degree of safety against bending and bending damage when extended. In general, the antenna is configured to rotate freely. When the first antenna unit 5 of the antenna 15 is housed in the housing 14 of the wireless device, If the user does not need to operate the wireless device, but frequently rotates the second antenna unit 10 as a playful action, the outer peripheral surface of the power supply fitting 8 is held in the holder 11. Spring 12
Of the power supply fitting 8 at the edges of the side edges of the plurality of slits 12B of the conduction spring 12, which may cause damage to the outer peripheral surface of the power supply fitting 8.
There is a problem in that the feel when extending or storing the antenna is impaired, and when the antenna 15 is extended, a scratch on the outer peripheral surface of the power supply fitting 8 may deteriorate the appearance quality.

The present invention solves such a conventional problem, and suppresses damage to the outer peripheral surface of the power supply fitting due to friction between the power supply fitting and the conductive spring when the antenna is rotated, and extends or retracts the antenna. It is an object of the present invention to provide an antenna in which the touch at the time is not impaired or the appearance quality is suppressed.

[0011]

In order to solve the above-mentioned problems, an antenna according to the present invention comprises a conductive spring made of an elastic metal plate for electrically connecting an antenna and an electric circuit of a radio, and a round bar-shaped connection of the antenna. The central contact portion elastically contacting the outer peripheral surface of the power supply fitting and the retaining member is an annular band of a predetermined width, and a plurality of leg-like contact portions extend upward and downward from upper and lower edges of the central contact portion. Further, the leg-shaped contact portion is formed so as to spread outward toward the tip, so that the tip is provided so as to be in elastic contact with the inner peripheral surface of the holder which is the connection portion of the wireless device.

Thus, the edge of the center contact portion of the conductive spring is only one portion of the annular band-shaped joint, and damage to the outer peripheral surface of the power supply fitting due to friction between the power supply fitting and the conductive spring when the antenna is rotated is suppressed. Thus, it is possible to obtain an antenna in which the feel when the antenna is extended or housed is suppressed and the appearance quality is suppressed.

[0013]

DETAILED DESCRIPTION OF THE INVENTION The first aspect of the present invention is directed to a first antenna element made of a linear metal wire having a resin joint fixed to an upper end and having an outer periphery covered with a resin tube. And a first antenna portion formed of a metal round bar-shaped retainer coupled to the lower end of the first antenna element, a round bar-shaped power supply fitting fixed to the upper end of the joint, and a resin fixed to an upper portion of the power supply fitting. A second antenna portion composed of a covered coil-shaped second antenna element, and an approximately cylindrical central portion having an antenna insertion hole through which the first antenna element is inserted so as to be able to freely enter and exit, are connected to an electric circuit of the device on the outer periphery. A metal holder having a mounting portion, and a substantially hook-shaped punched and bent elastic metal plate, each having a predetermined width from the upper and lower edges of an annular central contact portion. Extending upward and downward,
A plurality of leg-shaped contact portions formed so as to spread toward the tip are formed of a conductive spring housed inside the holder so as to elastically contact the inner surface of the holder, and when the first antenna portion is extended, When the center contact portion of the conduction spring resiliently contacts the outer peripheral surface of the retaining member, the first antenna portion is connected to an electric circuit of the device, and when the first antenna portion is housed in the device, the power supply fitting is provided. The center contact portion of the conductive spring resiliently contacts the outer peripheral surface of the antenna, and the second antenna portion is configured to be connected to an electric circuit of a device. Since it can be formed only at one place of the band-shaped mating part, it suppresses damage to the outer periphery of the power supply fitting due to friction between the power supply fitting and the conductive spring when rotating the antenna, and impairs the feel when extending or storing the antenna , An effect that can be obtained antenna that suppresses lowering the quality of appearance.

According to a second aspect of the present invention, in the first aspect of the present invention, the end of the joining portion of the annular center contact portion of the conduction spring is directed outward from a tangent line of the circular surface. When the antenna is rotated, the power supply fitting does not come into contact with the edge of the mating portion of the center contact portion, so that there is an effect that damage to the power supply fitting outer peripheral surface due to friction between the power supply fitting and the conductive spring can be made more difficult.

According to a third aspect of the present invention, in the first or second aspect of the invention, at least one leg-like contact portion of the conduction spring has a projection whose tip is bent outward, and this projection is It engages with the notch provided in the inner wall of the holder, and the engagement of the notch on the inner wall of the holder and the projection at the tip of the leg-like contact portion prevents rotation of the conduction spring in the holder. To prevent damage to the inner surface of the holder and the tip of the leg-shaped contact portion that resiliently contacts the inner surface of the holder and reduce the decrease in contact pressure, thereby stabilizing the electrical connection between the antenna and the electrical circuit of the device via the conductive spring. It has the effect that it can be done.

According to a fourth aspect of the present invention, in the first or second aspect of the present invention, at least one projection having a sharp lower end is provided below the upper end of the inner wall of the holder. It engages between two adjacent leg-shaped contact portions, and in addition to the same effect as the invention according to the third aspect by the engagement of the projection of the inner wall of the holder and the conduction spring, the inside of the holder can be engaged. There is an effect that the degree of freedom of the angular position at the time of insertion of the conduction spring is large and the insertion is easy.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG.

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

(Embodiment 1) FIG. 1 is a front sectional view of an antenna according to a first embodiment of the present invention, and FIG. 2 is an exploded perspective view of the antenna. In FIG. The first antenna element 2 is a resin tube that covers the first antenna element 1. A lower end of the first antenna element 1 is coupled with a metal round bar stopper 3, and a resin joint 4 is provided at the upper end. Are formed and fixed to form a first antenna portion 5, and 6 is a second antenna element formed by winding a good conductive metal wire such as copper or a copper alloy in a coil shape, and 7 is a second antenna element 6. Is a resin-made bobbin around which is wound a metal round bar-shaped power supply fitting. The lower end of the second antenna element 6 is electrically connected to the power supply fitting 8, and a resin cover 9 covers the outer periphery thereof. Two antenna unit 1 There is formed, the first antenna portion 5 the joint 4 is inserted and fixed to the lower end of the feeding metal pipe 8
And the second antenna unit 10 are combined to form an antenna 15, and the first antenna element 1 is inserted through the antenna insertion hole 11 </ b> A of the metal-made substantially cylindrical holder 11 as in the case of the related art. It is.

However, the conductive spring 21 in the holder 11 has a substantially continuous shape formed by punching and bending an elastic metal plate.
The center is the first antenna section 5 when the antenna is extended or stored.
And a ring-shaped central contact portion 21A having a predetermined width elastically contacting the power supply fitting 8 of the second antenna portion 10 and extending upward and downward from upper and lower edges thereof, respectively. The difference is that a plurality of leg-like contact portions 21B and 21C formed so as to spread out and elastically contact the inner peripheral surface of the holder 11.

The bent central contact portion 21A
The end 21 </ b> D of the mating portion is disposed outward from a tangent to the outer peripheral surface so as not to contact the outer peripheral surfaces of the power supply fitting 8 and the stopper 3.

With the above configuration, the plurality of leg-like contact portions 21B and 21C of the conductive spring 21 project on the inner peripheral surface of the holder 11, so that the inner peripheral surface of the holder 11 and the leg-like contact portion 21 are formed.
B, 21C, the frictional resistance in the rotation direction between the antenna 1
When the antenna 5 is stored, the frictional resistance in the rotational direction between the outer peripheral surface of the power supply fitting 8 and the central contact portion 21A, and when the antenna 15 is extended, the frictional resistance in the rotational direction between the outer peripheral surface of the stopper 3 and the central contact portion 21A. When the antenna 15 is rotated, the conductive spring 21 is unlikely to rotate, which is preferable in obtaining a stable electrical connection. Further, the center contact portion 21A of the conductive spring 21 and the power supply fitting are provided. The occurrence of rubbing due to rotation between the stopper 8 and the stopper 3 is the same as in the prior art, except that the central contact portion 21A has only one mating portion and the end portion 21D has a power supply fitting. Since it does not contact the outer peripheral surface of the retaining member 8 or the retaining member 3, damage due to friction can be suppressed.

As described above, according to the present embodiment, the outer peripheral surface of the power supply fitting 8 or the retainer 3 due to the friction between the conductive spring 21 and the power supply fitting 8 or the retainer 3 when the antenna 15 is rotated. , And the antenna can be prevented from impairing the feel when the antenna 15 is extended or housed, and from deteriorating the appearance.

(Embodiment 2) FIG. 3 is an exploded perspective view of a main part of an antenna according to a second embodiment of the present invention, and does not show the same configuration as that of the first embodiment.

In the figure, reference numeral 22 denotes a conduction spring, which is a leg-shaped contact portion 22 extending vertically from a central contact portion 22A.
B and 22C are different from those described in the first embodiment in that one end of a downwardly extending leg-shaped contact portion 22C has a projection 22D bent outward. The projection 22D is engaged with the notch 23A below the holder 23 provided corresponding to the projection 22D, so that the holder 2
A conduction spring 22 is housed in the inside 3.

According to the above configuration, since the projection 22D at the tip of the leg-like contact portion 22C of the conductive spring 22 is engaged with the notch 23A of the holder 23, the conductive spring 22 is rotated when the antenna 15 is rotated. 22 leg-shaped contact portions 22B, 22
Regardless of the magnitude of the frictional resistance in the rotational direction between C and the inner peripheral surface of the holder 23, the conduction spring 22 does not rotate,
The antenna 15 always rotates by rubbing between the central contact portion 22A of the conduction spring 22 and the power supply fitting 8 or the retaining member 3.

As described above, according to the present embodiment, the damage to the outer peripheral surface of the power supply fitting 8 or the stopper 3 due to the rotation of the antenna 15 is suppressed, and the feel when the antenna 15 is extended or stored is impaired. Deterioration in appearance quality can be suppressed, and the leg-shaped contact portions 22B,
Projection 22D at the tip of 22C and notch 23 of holder 23
Since the rotation of the conductive spring 22 in the holder 23 can be prevented by the engagement of A, there is no need to consider the magnitude of the frictional resistance in the rotational direction between the leg-like contact portions 22B, 22C and the inner peripheral surface of the holder 23. , Increasing the degree of freedom of design, the holder 23
Since the damage of the tips of the leg-like contact portions 22B and 22C which resiliently contact the inner peripheral surface and the inner peripheral surface of the holder 23 can be suppressed and the decrease in the contact pressure can be reduced, the antenna 15 via the conduction spring 22 can be reduced.
And the electrical connection of the electrical circuit of the equipment can be stabilized.

In the above description, the conductive spring 2
A projection 22D is provided at the tip of the second leg-shaped contact portion 22C, and the projection 22D is engaged with a notch 23A provided in the holder 23 to suppress rotation between the two.
As shown in the perspective view of the cross section of the main part of the holder in FIG. 4, a projection 24B having a sharp lower end is provided below the upper end of the inner wall of the housing hole 24A of the holder 24, and this projection 24B is connected to the conduction shown in FIG. As shown in the perspective view of the cross section of the main part of the holder in which the spring is combined, the holder is engaged between the two leg-shaped contact portions 21B of the conductive spring 21 having the same shape as that described in the first embodiment, and Of course, the same effect can be obtained even when the rotation of the spring 21 is restricted. With such a configuration, the operation of inserting the conductive spring 21 into the accommodation hole 24A of the holder 24 can be easily performed. It becomes.

[0029]

As described above, according to the present invention, damage to the outer peripheral surface of the power supply fitting or retaining member due to the rotation of the antenna is suppressed, and the feel when the antenna is extended or stored is impaired. In addition to suppressing the deterioration of the quality, the rotation of the conduction spring in the holder can be prevented, and the damage to the inner peripheral surface of the holder and the tip of the leg-shaped contact portion elastically contacting the inner peripheral surface of the holder can be suppressed. Therefore, there is an advantageous effect that an antenna having a stable electrical connection between the antenna and the electric circuit of the wireless device via the conductive spring can be obtained.

[Brief description of the drawings]

FIG. 1 is a front sectional view of an antenna according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the same.

FIG. 3 is an exploded perspective view of a main part of an antenna according to a second embodiment of the present invention.

FIG. 4 is a perspective view of a cross section of a main part showing another shape of the holder.

FIG. 5 is a perspective view of a cross section of a main part of the holder in which the conductive spring is combined.

FIG. 6 is a front sectional view of a conventional antenna.

FIG. 7 is an exploded perspective view of the same.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 first antenna element 2 tube 3 retaining 4 joint 5 first antenna section 6 second antenna element 7 bobbin 8 power supply fitting 9 cover 10 second antenna section 11, 23, 24 holder 11A antenna insertion holes 11B, 24A accommodation holes 11C Screw 13 Power feeding nut 14 Housing 15 Antenna 21 and 22 Conducting spring 21A, 22A Central contact 21B, 21C, 22B, 22C Leg-like contact 21D End 22D Projection 23A Notch 24B Projection

Continued on the front page (72) Inventor Mamoru Yoshida 1006 Kazuma Kadoma, Osaka Pref.Matsushita Electric Industrial Co., Ltd. 5J047 AA14 AB06 AB12 FA09 FA12

Claims (4)

[Claims] 1. A first antenna element made of a straight metal wire having a resin joint fixed to an upper end and an outer periphery covered with a resin tube, and a metal joined to a lower end of the first antenna element. A second antenna comprising a first antenna portion having a round bar-shaped stopper, a round bar-shaped power supply fitting fixed to the upper end of the joint, and a coil-shaped second antenna element fixed to the upper portion of the power supply fitting and covered with resin. An antenna portion, a metal holder having a mounting portion connected to an electric circuit of a device on a substantially cylindrical outer periphery having an antenna insertion hole through which the first antenna element is freely inserted and removed, and an elastic metal plate. It is a punched and bent approximately hook-shaped, extending upward and downward from the upper and lower edges of the ring-shaped central contact part with a predetermined width, and facing the tip. A plurality of leg-shaped contact portions formed so as to spread out are formed of conductive springs housed inside the holder so as to elastically contact the inner surface of the holder, and when the first antenna portion is extended, the disconnection occurs. When the center contact portion of the conductive spring resiliently contacts the outer peripheral surface of the stopper, the first antenna portion is connected to the electric circuit of the device, and when the first antenna portion is housed in the device, the outer periphery of the power supply fitting is provided. An antenna configured such that a central contact portion of the conductive spring resiliently contacts a surface and the second antenna portion is connected to an electric circuit of a device. 2. An end portion of a joining portion of a ring-shaped center contact portion of a conduction spring is directed outward from a tangent line of a circular surface thereof.
The described antenna. 3. The at least one leg-like contact portion of the conduction spring has a projection whose tip is bent outward, and the projection engages a notch provided on an inner wall of the holder. 2. The antenna according to 2. 4. A holder having at least one pointed lower end below the upper end of the inner wall of the holder, the projection engaging between two adjacent leg-like contact portions of the conduction spring. Or the antenna according to 2.