JPH1056311A - Antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily taking in/out an antenna material while the fixing of it is surely executed at the time of extending and containing by constituting a part which sliding-fits in the large diameter part of the antenna material and a spring material which is fitted to a notch (recessed part) provided in the large diameter part by means of separate parts. SOLUTION: The part which slide-fits in the large diameter part of the second antenna material 20 and the spring material which is fitted to the notch (recessed part) 26a provided in the large diameter part are constituted by separate parts. Structure for fixing the antenna material 20 is obtained by fitting a ring spring 15 to the notch (recessed part) 26a which is provided in a joint part 26 to be the large diameter part. The ring spring 15 is the one with a break and concentrically held with a core 11 and its inner diameter is formed to be a little smaller than the outer diameter of the joint part 26 and a top part 24a and also to be larger than the diameter of the antenna material 20 which is not the large diameter part. Here, the ring spring 15 has spring property and slide-fits by pushing-in even in the large diameter part of the joint part 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna which can be telescopically attached to a wireless device such as a portable telephone.
More specifically, an antenna with a simple structure that allows the rod-shaped antenna member to be pulled out of the housing or stored in the housing smoothly, and that can be firmly fixed when the antenna member is pulled out or stored in the housing. About.

[0002]

2. Description of the Related Art Conventionally, when a wireless device is used, a rod-shaped antenna member is pulled out of a housing to perform transmission and reception, and in a portable telephone or the like, a call signal is transmitted by a first antenna portion provided exposed from the housing. When receiving and communicating, an antenna is used which extends the second antenna portion formed of a rod-shaped antenna member from the housing to increase the sensitivity at the time of communication. The antenna member to be pulled out of the housing or housed in the housing needs to be firmly fixed each time, and various structures have been proposed.

For example, Japanese Patent Application Laid-Open No. Hei 8-162821 discloses that a click member covered with a cap is provided at a portion to be attached to a housing, and an elastic claw projecting from an inner periphery of the click member is provided. By providing a projection at a distance from the large diameter portion so that a recess is formed in a fixed portion (click engagement portion) of the antenna member that slides around,
There is disclosed a structure in which an elastic claw of a click member is engaged with and fixed to a concave portion. In other conventional structures, a concave portion is provided in the antenna member, and an elastic claw of a click member is engaged with the concave portion, or a large-diameter portion is provided in the antenna member, and the inner diameter is the same as the large-diameter portion. Therefore, a method has been adopted in which a click member having a slit formed in about half its length to facilitate insertion of the large-diameter portion is used, and the large-diameter portion of the antenna member is fixed by press-fitting the click member.

[0004]

In the above-mentioned method of fixing the antenna by engaging the concave portion of the antenna member with the elastic member provided on the inner periphery of the click member, the elastic claw is a part of the click member having the sliding portion. , It is difficult to obtain sufficient spring properties. In particular, as shown in the above-mentioned Japanese Patent Application Laid-Open No. 8-162821, when a slit is formed over the entire length of the click member to make it easier to insert the stopper portion of the antenna member, the inner diameter of the click member becomes constant. No. Therefore, if the inner diameter is too large, the click is insufficient, or the antenna comes out when the antenna is extended, and if the inner diameter is too small, the antenna cannot be pulled out or stored smoothly.

On the other hand, when a click member that is press-fitted into a large diameter portion of an antenna member without using an elastic claw is used, the inner diameter of the click member and the outer diameter of the large diameter portion of the antenna member are changed due to variations in component tolerance. The relationship is not constant and the optimal click state cannot always be obtained.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide an antenna which can easily enter and exit while securely fixing the antenna member when extending and storing. Aim.

Another object of the present invention is to provide a first antenna unit for receiving a call signal which is particularly suitable for a portable telephone, and a second antenna which is extended at the time of communication and is electrically coupled to the first antenna unit. It is an object of the present invention to provide an antenna having a portion and a portion that can be reliably fixed at the time of extension or storage as described above.

[0008]

An antenna according to the present invention comprises: a cylindrical core having one end fixed to a mounting bracket; a ring spring provided concentrically with the core at the other end of the core; And a cap having a through-hole covering the core and communicating with the hole in the center of the core, a rod-shaped antenna member having a top portion and a joint portion of a large-diameter portion that slides with the hole in the center of the core at both ends. And a notch that can be fitted to the ring spring is provided at a top portion and a joint portion of the rod-shaped antenna member. As a result, there is no slit in the core, and the core always slides on the large diameter portion of the antenna member with a constant inner diameter, and when extended and stored, the notch provided in the large diameter portion and the notch are fitted. This is performed by a ring spring. Since the ring spring is a single spring member held by the core and the cap, the ring spring is sufficiently fixed by the spring property of the ring spring.

A split type stopper whose outer diameter is larger than the inner diameter of the hole in which the joint of the cylindrical core slides is fitted to the end of the joint of the antenna member, so that the cap, ring spring, Since the stopper can be easily attached after the antenna member is inserted into the core, there is no need to slit the core or increase the inner diameter in anticipation of the insertion of the stopper.
Therefore, a more reliable click structure can be obtained.

The cylindrical core is made of an electrical insulator;
Since the antenna element is provided on the outer periphery of the core to form the first antenna portion, the antenna member that expands and contracts inside the core can be used as the second antenna portion. As a result, an antenna suitable for a mobile phone having a first antenna unit for receiving a call signal and a second antenna unit extended for communication can be provided with a small number of components, a simple structure, and It can be obtained with a structure that can be clicked reliably during extension or storage.

[0011]

Next, an antenna according to the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show a click of an antenna of the present invention having a first antenna section 10 for receiving a call signal suitable for a cellular phone or the like and a rod-shaped antenna (second antenna section) 20 extending during communication. It is explanatory drawing of a structure, FIG.
(A) is a partial cross-sectional explanatory view when a rod-shaped antenna member is extended, FIG. 1 (b) is a partially enlarged view of a click structure thereof,
FIGS. 2A and 2B are similar explanatory diagrams when the rod-shaped antenna member is stored.

In FIG. 1 and FIG.
Is formed by winding a sheet-like antenna element around the outer peripheral surface of a cylindrical core 11 made of polyacetal or the like. The antenna element is formed so as to have an electrical length of about ４ wavelength of a frequency band for normal transmission and reception. The lower end of the core 11 is the housing 2
A ring spring 15 is disposed concentrically with the cylindrical core 11 at the upper end thereof, and is held by a cap 14 so as not to come off. The cap 14 holds the ring spring 15 and
It also serves to protect the antenna element provided on the surface of the core, and is fixed to the mounting bracket 13 at the lower end. In the example shown in FIGS.
The inner surface of the inner surface 1 has a smaller inner diameter than the outer diameter of a stopper 27 provided at the distal end of the joint portion 26, which slides with the top portion 24 a or the joint portion 26 which is the large diameter portion of the second antenna portion 20. And a through portion 11b having a large inner diameter through which the stopper 27 can freely pass. However, when the antenna element is not formed in the core 11, or when the length of the sliding portion 11a is sufficient even if the antenna element is formed, only the sliding portion 11a is present, and the portion of the through portion 11b is not provided.
A structure in which the stopper 27 abuts on the end of the core 11 may be used.

As shown in FIGS. 1A and 1B, the structure for fixing (clicking) the second antenna portion 20 in the antenna of the present invention is similar to that of the joint portion 26 having a large diameter. This is performed by fitting the ring spring 15 into the notch (recess) 26a provided. That is, as shown in a plan view of FIG. 1 (c), the ring spring 15 is a split ring, made of a resin made of, for example, polyacetal, and is held concentrically with the core 11, and the ring spring 15 is held in a concentric manner. The inner diameter is formed to be slightly smaller than the outer diameter of the joint portion 26 and the top portion 24a and larger than the diameter of the second antenna portion 20 which is not the large diameter portion. However, the ring spring 15 has a spring property, and can be fitted by pushing in even the large diameter portion of the joint portion 26. Therefore, when the second antenna portion 20 is pulled out, the large-diameter joint portion 26 advances while sliding on the sliding portion 11a of the core 11, and when the notch 26a of the joint portion 26 reaches the ring spring 15, the notch 26 The ring spring 15 is fitted into 26a, and its diameter is reduced and reduced, and the second antenna unit 20 is clicked.
On the other hand, the middle portion of the second antenna member 20 is thinner than the large-diameter portion, so that the second antenna member 20 can freely pass through the ring spring 15 so that the second antenna portion 20 can be easily extended and retracted when stored without friction.

A stopper 2 is provided at the lower end of the joint 26.
7 is fixed, and even if the second antenna portion 20 is pulled too much, the second antenna portion 20 cannot pass through the sliding portion 11a of the core 11 and is prevented from coming off. This stopper 27 is made of a resin made of, for example, polyacetal, which is split into a ring shape as shown in a perspective view of FIG. 1D, and a cross-sectional view of the stopper 27 portion is shown in FIG. Is attached in a structure to be cut into a concave groove provided in the joint portion 26. That is, if the second antenna unit 20 is inserted into the core 11 with the stopper 27 attached to the second antenna unit 20, the second antenna unit 20 can be inserted unless a slit is formed in the core 11. As a result, the fitting of the sliding portion becomes unstable as in the conventional product. Therefore, in the present invention, the stopper 27 is easily attached after the second antenna section 20 is inserted into the core 11 and is inserted into the concave groove with a split mold so that the stopper 27 can be securely attached without being detached. Things. By forming the stopper 27 in such a structure, the stopper 27 can be easily attached after the second antenna unit 20 is inserted, and as described above, the core 11 is not provided with a slit or the like, and the reliability is improved. High lubrication can be obtained.

When the second antenna unit 20 is housed in the housing 2, the second antenna unit 20 is pushed in as shown in FIG. 2 together with a partially enlarged view.
The portion of the second antenna portion 20 other than the large diameter portion falls lightly, and when the top portion 24a, which is the large diameter portion, reaches the ring spring 15, the inner diameter of the ring spring 15 is smaller than the outer diameter of the top portion 24a as described above. , Fall stops. But,
The ring spring 15
Is spread out, and the large-diameter portion of the top portion 24a is pushed in while sliding on the ring spring 15 and the sliding portion 11a of the core 11, and a notch (recess) 2 provided in the top portion 24a is provided.
When 4b comes to ring spring 15, ring spring 15 is fitted into notch 24b and clicked. As a result, as shown in FIG. 2, the top 14 is fixed on the cap 14 with the top 14 exposed. In this state, the second antenna unit 20 is housed in the housing 2 and does not operate as an antenna, and only the first antenna unit 10 is exposed from the housing 2 and functions, for example, as an antenna for receiving a call signal. .

As the antenna element 1 wound around the outer periphery of the core 11, for example, an antenna element formed of a copper plate or the like in a pattern shape as shown in FIG. 3 can be used. The antenna element 1 includes a feeder 3
From 0 to the first element 111 of the first zigzag portion, about 1/4 wavelength (λ
_H / 4), and an antenna having an electric length of about 1/4 wavelength with respect to the first frequency band (about half lower frequency) over the entire length together with other elements 115. The antenna can transmit and receive two frequency bands. Antenna element 1 of this pattern
Is wound around the outer surface of the core 11 described above, and a second antenna unit 20 capable of transmitting and receiving as a half-wavelength antenna in two frequency bands at the center of the core 11 is extended. As a result, the two antennas are electromagnetically coupled to each other, so that a paging signal can be received in two frequency bands, and transmission / reception at the time of communication with increased sensitivity can be performed. The antenna element 1 shown in FIG.
A coupling fold 111a is formed at the end of the first element 111 such that the end of the element 111 is closest to the second antenna unit 20, and the tip 1e of the antenna element 1 is second from the coupling fold 111a. Is formed so as to be distant from the antenna section 20. This is the second
Since the entire length of the antenna element 1 has an electrical length of about ／ wavelength for the frequency band of, the folded portion 111a for coupling has the highest voltage + V and the tip 1e has the lowest voltage -V, Folding portion 111a for coupling and tip 1e
This is because if they are close to each other, they are mutually coupled, and it is difficult to couple with the end of the second antenna unit 20 having the voltage of -V. With such a structure, the antenna sections 10 and 2 can be efficiently used in both the first frequency band and the second frequency band.
0 is connected.

The second antenna section 20 has a normal electrical length of 1
It is possible to use a coil coated with a resin at a half wavelength and covered with a resin, or a resin covered with a resin as a closed-loop series resonance circuit of an inductor element and a capacitor element. Further, in order to use two antennas, two antenna elements can be obtained by coupling two antenna elements by a trap or by using a phase shifter as usual.

In the above-described example, the antenna element is provided on the outer peripheral surface of the core to form the first antenna portion. However, it is not necessary to operate a part of the antenna at all times, and the antenna member may be extended only during use. In this case, the antenna element on the outer peripheral surface of the core may not be provided in the above-described configuration and may be used as the first antenna element.

[0020]

According to the present invention, the spring member to be fitted into the notch (recess) provided in the large diameter portion and the portion to which the large diameter portion of the antenna member to be extended or accommodated is formed as separate parts. Therefore, there is no need to form a slit or the like in the sliding portion, and a stable sliding portion can be always obtained, and strong spring properties can be obtained because the spring member is constituted by the ring spring alone. As a result, a stable click can be obtained at the time of extension and storage, and an antenna that can be easily inserted and removed can be obtained.

Further, by winding the antenna element around the outer peripheral surface of the core forming the sliding portion, the first antenna portion can be easily formed, and the first antenna portion is connected with the antenna member which is extended or stored. An antenna can be obtained with a simple structure with few components. As a result, an antenna such as a mobile phone having a first antenna unit for receiving a call signal and a second antenna unit that is extended to increase sensitivity during communication can be obtained at low cost.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a state where a second antenna section of an antenna according to the present invention is extended.

FIG. 2 is an explanatory view of a state in which a second antenna unit of the antenna according to the present invention is housed.

FIG. 3 is a diagram illustrating an example of an antenna element wound around an outer periphery of a core constituting a first antenna unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 1st antenna part 11 core 13 mounting bracket 14 cap 15 ring spring 20 2nd antenna part (antenna member) 24 top 24a top part 24b notch 26 joint part 26a notch 27 stopper

Claims (3)

[Claims] 1. A cylindrical core having one end fixed to a mounting bracket, a ring spring provided concentrically with the core on the other end side of the core, and a center portion of the core covering the ring spring and the core. A cap having a through-hole communicating with the hole, and a rod-shaped antenna member having a top portion of a large diameter portion and a joint portion at both end sides which slide with the hole in the center of the core, and a top portion of the rod-shaped antenna member. And an antenna provided with a notch at a joint portion capable of fitting with the ring spring. 2. The antenna according to claim 1, wherein a split-type stopper having an outer diameter larger than an inner diameter of a hole in which the joint of the cylindrical core slides is fitted to an end of the joint of the rod-shaped antenna member. . 3. The antenna according to claim 1, wherein the cylindrical core is formed of an electrical insulator, and an antenna element is provided on an outer periphery of the core to form a first antenna unit.