JP3141921B2 - transceiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio having a drawer-type linear antenna and having a high antenna system gain when the linear antenna is pulled out and stored.

[0002]

2. Description of the Related Art FIG. 8 is a view of a conventional radio having a drawer-type linear antenna, wherein A is a perspective view showing a state in which the linear antenna is housed, and B is a perspective view. It is sectional drawing of the state in which the linear antenna was pulled out. Here, 101 is a pull-out linear antenna, 1
02 is an antenna holding means of a linear antenna, 103 is a radio body, 104 is an internal radio circuit, and 105 is a large diameter portion at the lower end of the linear antenna.

[0003] Such a conventional wireless device is designed so as to obtain the maximum gain in a state where the linear antenna 101 is pulled out, and no consideration is given when the linear antenna is housed. For this reason, the gain was greatly reduced when the antenna was housed. Therefore, when using such a wireless device, it is necessary to pull out the antenna without fail.
In addition, when performing standby using such a wireless device, there is a possibility that reception failure may occur when the antenna is housed.

The present invention has been made in order to solve such a problem. The gain of the antenna system is high not only when the linear antenna is pulled out but also when the linear antenna is housed, so that good reception can be achieved. An object of the present invention is to provide a wireless device whose antenna system has a simple and economical structure.

[0005]

[Means for Solving the Problems]

(1) The invention according to claim 1 includes a pull-out linear antenna,
A second antenna attached to the outer surface of the housing, switch means for switching and connecting the internal radio circuit to the linear antenna or the second antenna, and switching of the switch means by storing or pulling out the linear antenna in the housing; , And in particular, the switch means includes a movable contact piece having an arcuate spring connected to an internal wireless circuit, and a first contact piece integrally formed to project from the linear antenna. And a second contact piece connected to the second antenna. The first contact piece also serves as switch control means, abuts against the bow spring, biases the spring, and controls switching of the movable contact piece. Things.

(2) In the invention of claim 2, in the above (1), the second antenna is a helical antenna, and the linear antenna is arranged concentrically on the axis of the helical antenna. (3) In the invention according to claim 3, in the above (1), the second antenna is a plate-shaped inverted-F antenna, and a hole through which a linear antenna is put in and out is formed in a radiation conductor plate of the plate-shaped inverted-F antenna. Is what it is.

(4) In the invention according to claim 4, in the above (1), when the linear antenna is pulled out of the housing, the first contact piece abuts on the bow spring of the movable contact piece, which is biased to move the movable spring. When the contact between the contact piece and the second contact piece is released and the linear antenna is housed in the housing, the first contact piece is separated from the movable contact piece, and the bow spring of the movable contact piece self-returns, and the second contact piece returns to the second position. It comes into elastic contact with the contact piece.

(5) In the invention of claim 5, in the above (1), one end of the movable contact piece is extended, and a hole through which the linear antenna penetrates is formed in the extended portion. (6) In the invention of claim 6, in the above (2) or (3), a non-metallic rod substantially equal to or longer than the height of the helical antenna or the plate-shaped inverted-F antenna is provided at the tip of the linear antenna. When the linear antenna is extended and housed in the housing, the non-metallic bar is arranged in the helical antenna or the plate-shaped inverted-F antenna.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) An embodiment of the present invention will be described with reference to the first embodiment of FIGS. The present invention has a mechanism for switching to a helical antenna, which is a second antenna, by a leaf spring switch when a linear antenna is housed. A is a diagram when the antenna is housed, and B is a diagram when the antenna is pulled out. Is a sectional view, and FIG. 2 is a perspective view. here,
1 is a linear antenna, 2 is a second antenna installed in a radio device housing, 3 is a movable contact having a conductive plate-shaped bow spring 3a, 4 is a second contact, 5 is antenna holding means, 6 is a holding means of a movable contact piece, 7 is a wireless device housing, 8 is an internal wireless circuit,
Reference numeral 9 denotes a large-diameter portion at the lower end of the linear antenna.

[0010] With this structure, the linear antenna can be pulled out and stored with a very simple structure.
A mechanical switch SW for switching between the linear antenna 1 and the second antenna 2 can be configured as an antenna to be used. The specific operation is as follows. When the linear antenna 1 is housed in the wireless device housing 7, the bow spring 3 a
Due to the elasticity of the linear antenna 1, the curved portion approaches, but does not contact, the non-thick portion of the linear antenna 1. On the other hand, the vicinity of the tip of the bow spring is in contact with the second contact piece. As a result, the internal wireless circuit 8 is disconnected from the linear antenna 1 and connected to the helical antenna 2 via the second contact piece 4. On the other hand, when the linear antenna 1 is pulled out from the wireless device housing 7, the curved portion of the bow spring 3a comes into contact with the first contact piece 9a of the large diameter portion 9 of the linear antenna base. At this time, the vicinity of the distal end of the bow spring 3a does not come into contact with the second contact piece 4. Thereby, the internal wireless circuit 8 is connected to the linear antenna 1 and separated from the helical antenna 2.

That is, the movable contact piece 3 (bow-shaped spring 3a), the first contact piece 9a and the second contact piece 4 constitute a switch SW when the linear antenna is extended / retracted. This mechanism is very simple, easy to implement, highly reliable and inexpensive to manufacture. In this case, the antenna holding portion does not need to be made of metal as in the conventional antenna shown in FIG. Therefore, with this configuration, it is possible to realize a radio device in which the gain of the antenna system is high and good reception is possible even when the linear antenna 1 is pulled out and stored.

In the case of this example, no matching circuit is provided in the power supply portion, but the installation does not restrict the operation at all. The second antenna is not limited to a helical antenna as in this example. Furthermore, the shapes of the movable contact piece 3, the first contact piece 9a, and the second contact piece 4 may be any as long as they have the same function, and are not limited to these shapes. (Embodiment 2) FIGS. 3 and 4 show a second embodiment of the present invention, in which one end of a bow-shaped spring 3a is bent and extended, and an extension 3b is provided with a hole 3c through which a linear antenna passes. is there. A is a view when the antenna is stored, B is a view when the antenna is pulled out, FIG. 3 is a sectional view, and FIG. 4 is a perspective view.

In this case, the operation is completely the same as that of the first embodiment, but the opening and closing of the switch are more surely performed. That is, the movable contact piece 3 is provided with a hole 3c through which the linear antenna penetrates, and the contact portion is located on the opposite side of the bow spring 3a when viewed from the linear antenna, so that the displacement of the contact portion is increased and more reliable. Switch operation can be realized. FIG. 5 shows the experimental results of Example 2. 7A is a diagram illustrating a frequency characteristic of a return loss when the linear antenna is pulled out, and FIG. The length of the linear antenna 1 is about 12 cm, the second antenna 2 is a helical antenna, and is wound 3.5 times around a 7 mm diameter cylinder.
And the movable contact piece 3. As is apparent from FIG.
Resonance occurs near 0 MHz, indicating that the switching operation of the switch has been performed reliably. (Embodiment 3) FIG. 6 shows a third embodiment of the present invention, in which the metal portion of the linear antenna 1 does not exist inside the helical antenna 2 during storage, thereby improving the performance of the helical antenna. It was made. A is a diagram when the antenna is stored, and B is a diagram when the antenna is pulled out. Where 11
Is a dielectric rod (non-metal rod) at the tip of the linear antenna, and 12 is a capacitor for adjusting the reactance component of the helical antenna, which ensures more reliable matching with the internal radio circuit 8. The other parts are the same as those of the second embodiment shown in FIGS. The helical antenna 2 has a higher gain when no metal is present inside. When pulling out the linear antenna 1, the dielectric rod 11 can be pinched and pulled out. (Embodiment 4) FIG. 7 shows a fourth embodiment of the present invention in which a plate-shaped inverted-F antenna 2 'is used as a second antenna. FIG. By using a plate-shaped inverted F antenna, the radio device has no projection at all. Others are the same as the second embodiment.

The second antenna is not limited to a helical antenna and a plate-shaped inverted-F antenna, and almost all flat antennas and small antennas such as a microstrip antenna, a slot antenna, and a zigzag antenna can be employed.

[0015]

As described above, the present wireless device is provided with the switch means for switching control by the pulling out / storing operation of the linear antenna 1, and the internal wireless circuit 8 is switched when the linear antenna 1 is pulled out. In any case, the antenna system is arranged on the outer surface of the housing by switching and connecting to the second antenna when the antenna is housed, so that a radio device that has high gain and can receive signals satisfactorily can be provided.

In the present invention, the switch means and the switch control means are constituted by the movable contact piece having the bow spring and the first contact piece protruding from the linear antenna as described above, so that the switch means is relatively constructed. An antenna system having a simple and inexpensive structure can be obtained.

[Brief description of the drawings]

FIG. 1 is a principle sectional view showing a main part of a first embodiment of the present invention.

FIG. 2 is a perspective view of a main part of the first embodiment of FIG. 1;

FIG. 3 is a principle sectional view showing a main part of a second embodiment of the present invention.

FIG. 4 is a perspective view of a main part of the second embodiment of FIG. 3;

FIG. 5 is a view showing a return loss frequency characteristic of the second embodiment of FIGS. 3 and 4;

FIG. 6 is a principle sectional view showing a main part of a third embodiment of the present invention.

FIG. 7 is a principle sectional view showing a main part of a fourth embodiment of the present invention.

FIG. 8 is a perspective view showing a principal part of a conventional wireless device.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01Q 1/24 H01Q 1/08 H01Q 21/28

Claims (6)

(57) [Claims] 1. A drawer which can be pulled out and stored inside and outside of a housing,
A linear antenna having a first contact piece protruding from an end on the housing side.
When attached to the outer surface of the housing, the second contact piece against an end of the housing side
A movable leg having a connected second antenna and a contact point for coming into contact with and separating from the second contact piece;
And a fixed leg to which an internal wireless circuit is connected, and the movable leg
Transmission in which the bow spring between the leg and the fixed leg is integrally formed
Conductive switch means, wherein the first contact piece abuts on the bow spring,
That the contact between the second contact piece and the movable leg is cut off.
Features radio equipment. 2. The wireless device according to claim 1, wherein the second antenna is a helical antenna, and the linear antenna is concentrically arranged on the axis of the helical antenna. 3. The antenna according to claim 1, wherein the second antenna is a plate-shaped inverted-F antenna, and a radiation conductor plate of the plate-shaped inverted-F antenna is formed with a hole for taking the linear antenna in and out. Features radio equipment. 4. The device according to claim 1, wherein when the linear antenna is pulled out of the housing, the first contact piece abuts on the bow-shaped spring of the movable contact piece, and the first contact piece is biased to move the movable contact piece with the movable contact piece. When the contact with the second contact piece is released and the linear antenna is housed in the housing, the first contact piece is separated from the movable contact piece, and the bow-shaped spring of the movable contact piece self-returns, and A wireless device, which makes elastic contact with a second contact piece. 5. The wireless device according to claim 1, wherein one end of the movable contact piece is extended, and a hole through which the linear antenna penetrates is formed in the extended portion. 6. The helical antenna or plate-like inverted F according to claim 2, wherein a tip of the linear antenna is provided.
When a non-metallic rod that is approximately equal to or longer than the height of the antenna is extended and the linear antenna is housed in a housing, the non-metallic rod is disposed in the helical antenna or the plate-shaped inverted F antenna. A wireless device characterized by the following.