JP2000040909A - Antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple and inexpensive antenna, which is suitable for a portable telephone set and a radio machine for mobile object communication and which has a wide band and high sensitivity. SOLUTION: An antenna 1 has a first antenna part 10 fitted to the outer part of a casing, a second antenna part 20 which passes through the part 10 and a stopper is installed on one end and a holder part 15, which holds the antenna 1 in the casing and forms a power feeding part. When the antenna part 20 is pulled out of the casing, or it is stored, a part of the antenna part 10 is mechanically connected to the holder part 15. When the antenna part 20 is in an extended state, a part of the antenna part 10 is mechanically connected to the holder part 15 and is mechanically connected to the stopper. When the antenna part 20 is in a stored state, it turns into a non-conduction state with the holder part 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Japanese Patent Laid-Open Nos. Hei 2-271701 and Hei 6-216630 describe telescopic whip antennas.
And Japanese Patent Laid-Open Publication Nos. (Kokai) Publication (hereinafter referred to as Conventional Techniques 1 and 2 respectively).

A telescopic whip antenna (hereinafter simply referred to as an antenna) disclosed in Prior Art 1 includes a ス プ リ ン グ wavelength spring-shaped antenna element and a 波長 wavelength helical antenna fixed to a housing. The antenna element is capacitively coupled, and has a structure in which a spring-like antenna element expands and contracts via a helical element.

FIGS. 5 and 6 are partial cross-sectional views showing an antenna according to the prior art 2. FIG. 5 shows a state when the antenna is housed, and FIG. 6 shows a state when the antenna is extended.

As shown in FIG. 5, an antenna 50 according to the prior art 2 has a half-wave whip antenna element (hereinafter, referred to as an antenna rod) having a stopper 51 at one end and an antenna top 52 at the other end. 53, and a helical antenna portion 56 made of a cylindrical insulator accommodating a １ ／ wavelength helical antenna element (hereinafter, simply referred to as a helical antenna) 54 disposed around the antenna rod portion 53. . The antenna 50 according to the prior art 2 is electrically connected to a power supply unit 62 provided in a housing 61 of the portable wireless device, and the housing 50 is configured such that the antenna rod 53 can be stored in the housing 61. It is attached to 61.

[0006] As shown in FIG. 5, when the antenna is housed, the antenna rod 53 is electrically disconnected from the feeder 62, and the helical antenna 54 is always connected to the feeder 62.
And will be separated.

As shown in FIG. 6, when the antenna is extended, the stopper 51 provided at one end of the antenna rod 53 is held by the feeder 62 so that the antenna rod 53 and the helical antenna 52 are both Will be joined.

[0008]

The problem with the structure of the prior art 1 is that it is difficult to obtain a constant capacitive coupling, which may make it difficult to supply a stable product.

In order to solve the problems in the prior art 1, the antenna disclosed in the prior art 2 is provided with a helical antenna provided on a housing and penetrating through the helical antenna to be housed in the housing, or It has an antenna rod that can extend outside the housing, and the helical antenna and the antenna rod are connected to a radio circuit inside the housing via a matching circuit.

According to the above-mentioned prior arts 1 and 2, both structures show that the helical antenna element is always mechanically connected to the holder portion serving as the power supply portion.

It is therefore a technical object of the present invention to improve the above-mentioned problem of the conventional telescopic whip antenna, to be suitable for a mobile communication radio such as a portable telephone, and to provide an existing type of power supply. A helical coil-shaped antenna is always connected to the holder part, which is the same as the whip antenna. To provide an antenna that is simpler and cheaper to manufacture.

[0012]

DISCLOSURE OF THE INVENTION The present invention has been studied to solve the above-mentioned problems, and differs from the structures of the prior arts 1 and 2 in that both antenna elements are at a certain position in the housed state or the extended state. When the second antenna unit is extended, the stopper is mechanically connected when the second antenna unit is extended. When the second antenna unit is retracted, the first antenna unit is in a non-conductive state. Has found an antenna structure that receives power and functions as an antenna, and has accomplished the present invention.

That is, according to the present invention, a first antenna portion protrudingly attached to the outside of the housing of the portable wireless device,
A second antenna unit slidable through the first antenna unit and provided with a stopper at one end;
A holder that holds an antenna in the housing and serves as a power supply unit, when the second antenna unit is pulled out of the housing or when housed inside the housing, When a part of the first antenna part is mechanically connected to the holder part and the second antenna part is in an extended state, a part of the first antenna part is mechanically connected to the holder part. And a structure for mechanically connecting to the stopper, and when the second antenna unit is in the housed state, the second antenna unit is provided with an insulating portion provided in a part of the second antenna unit. An antenna characterized in that the antenna part and the holder part are in a non-conductive state.

According to the present invention, in the antenna, the first antenna includes a helical coil and a spring member provided at one end of the helical coil, and the spring member is provided at one end of the helical coil. An antenna characterized in that a switch contact for interrupting or energizing the electrical connection to the helical coil is formed depending on a difference in diameter of an object that contacts or fits into the antenna.

Further, according to the present invention, in the antenna, the helical coil and the spring member are formed by forming at least one elastic wire into a helical coil shape and forming the spring member at one end. An antenna characterized by being made of an object is obtained.

According to the present invention, in the antenna, the wire having elasticity has a wire diameter of 0.3 to 0.6 m.
An antenna is obtained which is made of at least one selected from copper and stainless steel each having about m.

Further, according to the present invention, in the antenna, the second antenna is formed by forming at least one wire into a helical coil shape, and is linearly formed of rubber or resin to maintain the shape. An antenna characterized in that:

According to the present invention, in the antenna, the wire is made of at least one kind of a single wire having a diameter of 0.1 mm to 0.3 mm, such as copper, stainless steel, SWP or the like. Is obtained.

According to the present invention, there is provided the above antenna, wherein the second antenna uses at least one wire.

Further, according to the present invention, in the antenna, the wire is a copper-based wire having a wire diameter of 0.5 to 1.0 mm;
An antenna characterized by being made of at least one kind of single wire among superelastic materials such as stainless steel, SWP, and Ni-Ti material is obtained.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a half sectional view showing the entire structure of an antenna according to a first embodiment of the present invention, and shows a stored state of the antenna. FIG. 2 is a half sectional view mainly showing the first antenna unit 10 of FIG. FIG. 3 is a half sectional view showing an extended state of the antenna of FIG. FIG. 4 is a half sectional view mainly showing the first antenna unit 10 of FIG.

Referring to FIGS. 1 to 4, the antenna 1 is a telescopic whip antenna, and a first antenna unit 10.
And a second antenna unit 20 inserted into the first antenna unit 10 so as to be slidable in the axial direction.

As best shown in FIGS. 2 and 4, the first antenna section 10 is inserted around the second antenna section 20 and the insulator 22 of the second antenna section 20 is provided. A coil bobbin 12 disposed around a cylindrical large-diameter portion 24, a helical coil 11 wound around the coil bobbin 12, and provided at one end of the coil bobbin 12, and formed integrally with one end of the helical coil 11. Contact spring portion 13 and coil bobbin 12 of contact spring portion 13
A power supply holder 15 having a cylindrical end covering one end opposite to the side, and a helical coil 11, a contact spring 13 and a power supply holder 15 are provided so as to cover one end of the cylinder. And a cylindrical housing 16.

Helical coil 11 and contact spring 13
Is made of a copper or stainless single wire having a wire diameter of about 0.3 to 0.6 mm, but a plurality of same or different single wires may be used in parallel, bundled or twisted.

In the first antenna section 10, the power supply holder section 15 plays a role of an antenna mounting section for mounting an antenna to a casing (not shown). The contact spring portion 3 serves as a contact of a switch that cuts off or conducts between the power supply holder portion 15 and the helical coil 11 by a change in the diameter of the contact spring portion 3 that is fitted into one end of the cylindrical first antenna portion 1. .

As best shown in FIGS. 1 and 3, the second antenna section 20 includes an antenna element 21 made of a conductive material, an insulator 22 provided around the antenna element 21, and an antenna element 21. A small-diameter portion 23 made of an insulator extending continuously from the insulator 22 on one end side of the insulator 21 and a large-diameter portion made of the same insulator extending continuously from the small-diameter portion 23 and having a larger diameter than the small-diameter portion. 24, and a top part 25 provided at the tip of the large diameter part 24. On the other hand, the other end of the antenna element 21 is provided with an insulator 22 and a stopper 26 made of a conductive material having a diameter larger than the small diameter portion. In the second antenna unit 20, as the element 21, depending on a required wavelength,
A single wire or a helical coil can also be used. Here, in the case of a single wire, at least one of super-elastic materials such as copper, stainless steel, SWP, and Ni-Ti material having a wire diameter of 0.5 to 1.0 mm can be used.

As the single wire constituting the helical coil, a single wire of 0.1 mm to 0.3 mm in diameter such as copper, stainless steel, SWP or the like can be used alone or in combination.

The large diameter portion 24 and the stopper conductor 24
Have substantially the same outer diameter and thickness. However, there is no problem even if the entire surface has the same diameter without providing such a step.

A power supply holder 15 having a housing 16 with the first antenna 10 disposed therein.
Is attached to the housing so as to partially protrude outside the housing of the mobile communication radio including the mobile phone, and the second
The antenna section 20 penetrates the first antenna section 10 and slides freely.

Next, the operation of the portable antenna according to the embodiment of the present invention will be described.

First, the case where the second antenna unit 20 is in the housed state will be described with reference to FIGS. 1 and 2 again.

The second antenna penetrating the first antenna unit 10
Small-diameter portion 2 which is only an insulator of the antenna portion 20 of FIG.
3. Since the large diameter portion 24 is longer than the first antenna portion 10, both antennas are in a disconnected state. At this time, the large-diameter portion 24 comes into contact with the contact spring portion 13 of the first antenna portion 10 and is pushed outward from the antenna center axis 16 to form a part of the inner diameter surface of the power supply holder portion 15 serving as a power supply portion. Then, power is supplied to the first antenna unit 10.

Next, the case where the second antenna section 20 is in the extended state will be described.

Referring again to FIGS. 3 and 4, when the second antenna section 20 is in the extended state, the stopper 26 is fitted into the power supply holder section 15 except for a part, and the first stopper 20 is partially inserted into the stopper 26. Contact portion 13 of the antenna portion 10
And the contact spring portion 13 is pushed outward from the central axis of the antenna.

That is, the stopper 26 serving as the power receiving unit of the first antenna unit 10 and the second antenna unit 20 is mechanically connected. Further, the contact spring portion 13 expanded from the antenna center axis simultaneously contacts a part of the inner diameter surface of the power supply holder portion 15 serving as a power supply portion, so that power is supplied to both the antenna portions 10 and 20. .

As described above, in the antenna according to the embodiment of the present invention, when the second antenna unit 20 is in the extended state, both the first and second antennas operate as antennas and the second antenna When the unit 20 is in the stowed state, only the first antenna unit 10 operates as an antenna.

[0038]

As described above, according to the present invention, the helical coil-shaped antenna is always connected to the existing holder serving as the power supply portion, and the type that is capacitively coupled to the whip antenna and the coupling thereof are stabilized. Therefore, a high-bandwidth and high-sensitivity antenna similar to an antenna of a type connected via a matching circuit can be manufactured and supplied more easily and at lower cost.

[Brief description of the drawings]

FIG. 1 is a half cross-sectional view showing an entire configuration of an antenna according to an embodiment of the present invention, showing an antenna housed state.

FIG. 2 is a partial half sectional view mainly showing a first antenna unit 10 of the antenna of FIG. 1;

FIG. 3 is a half sectional view showing an extended state of the antenna according to the embodiment of the present invention.

FIG. 4 is a partial half sectional view mainly showing a first antenna unit 10 of the antenna of FIG. 3;

FIG. 5 is a diagram illustrating an example of a stored state of an antenna according to the related art 2.

FIG. 6 is a diagram illustrating an example of an extended state of an antenna according to the related art 2.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antenna 10 1st antenna part 11 Helical coil 12 Coil bobbin 13 Contact spring part 15 Feeding holder part 16 Housing part 20 Second antenna part 21 Antenna element 22 Insulator 23 Small diameter part 24 Large diameter part 25 Top part 26 Stopper part 50 Antenna 51 Stopper 52 Antenna top 53 Antenna rod part 54 Helical antenna 56 Helical antenna part 61 Housing 62 Feeding part

Claims (8)

[Claims] 1. A first antenna section protrudingly mounted outside a housing of a portable wireless device, and a second antenna slidable through the first antenna section and provided with a stopper at one end. An antenna portion, and a holder portion for holding an antenna in the housing and serving as a power supply portion, and when the second antenna portion is pulled out of the housing, or housed inside the housing. When a part of the first antenna part is mechanically connected to the holder part and the second antenna part is in an extended state, a part of the first antenna part is connected to the holder part. And mechanically connected to the stopper, and when the second antenna unit is in the housed state,
The antenna, wherein the second antenna portion and the holder portion are brought into a non-conductive state by an insulating portion provided in a part of the second antenna portion. 2. The antenna according to claim 1, wherein the first antenna includes a helical coil and a spring member provided at one end of the helical coil, and the spring member contacts one end of the helical coil. An antenna, wherein a switch contact for interrupting or energizing an electric connection to the helical coil is formed depending on a difference in diameter of an object to be inserted. 3. The antenna according to claim 2, wherein the helical coil and the spring member are formed from an integrated body in which at least one elastic wire is formed in a helical coil shape, and the spring member is formed at one end thereof. An antenna, comprising: 4. The antenna according to claim 3, wherein the elastic wire is made of at least one selected from copper and stainless steel having a wire diameter of about 0.3 to 0.6 mm. Antenna to do. 5. The antenna according to claim 1, wherein the second antenna has at least one wire formed in a helical coil shape, and is linearly formed of rubber or resin to maintain its shape. Features antenna. 6. The antenna according to claim 5, wherein the wire is made of at least one of a single wire having a diameter of 0.1 mm to 0.3 mm, such as copper, stainless steel, or SWP. 7. The antenna according to claim 1, wherein the second antenna uses at least one wire. 8. The antenna according to claim 7, wherein the wire is made of copper, stainless steel having a wire diameter of 0.5 to 1.0 mm.
An antenna comprising at least one kind of single wire among superelastic materials such as SWP and Ni-Ti material.