JPS6017928Y2 - transceiver - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a radio device that switches between a built-in antenna and an external antenna.

Considering the operability of the radio, the antenna is better than an external antenna that is attached to the housing with screws or bayonet.
A built-in antenna that is attached to a printed circuit board or the like and placed inside the housing in advance is much more advantageous.

However, it is well known that external antennas are much more advantageous than built-in antennas in terms of antenna gain.

In order to obtain both of these advantages, it has often been seen in the past that radio equipment has a built-in antenna located inside the housing and can also be equipped with an external antenna.

In this case, when changing the antenna used from the built-in antenna to the external antenna, or conversely from the external antenna to the built-in antenna, a changeover switch must be provided and the changeover must be performed manually.

In the case of such a switching method, the operability is poor because the switching is done manually, and if the switching is forgotten, the external antenna attached for the purpose of obtaining high gain may not have sufficient characteristics.
Furthermore, it has been observed that the power amplifier section may be damaged due to mismatching of output impedance.

The present invention eliminates these drawbacks, and the following points are explained below.
An embodiment thereof will be explained using FIGS. 2 and 3.

1 is a resin casing of the radio, 2 is an external antenna having a male thread 2a, and 3 is a mounting part for an external antenna made of metal, which has a female thread 3a, and is attached to the resin casing of the radio. It is fixed to the body 1 by integral molding.

4 is an insulated movable body that moves in the axial direction depending on the presence or absence of the external antenna 2; 5 is a metal shaft integrated into the insulator 4; like the insulator 4, it moves depending on the presence or absence of the external antenna 2; .

6 is a coil spring for returning the insulator 4 and metal shaft 5 when the external antenna 2 is removed from the mounting portion 3.

7 is a printed circuit board, and 8 is a built-in antenna, which is fixed to the printed circuit board 7 by soldering.

A leaf spring 9 is bent by the axial movement of the insulating movable body 4 and the metal shaft 5, has a function as a ground terminal on the electric circuit, and is connected to the ground of the printed circuit board 7 and the built-in antenna 8.

Reference numeral 10 designates a conductor constituting a first leaf spring, one end of which is in spring contact with the external antenna mounting portion 3 made of metal, and the other end of which is connected to the high frequency input/output portion of the printed circuit board 7.

Reference numeral 11 denotes a second metal leaf spring connected to one end of the built-in antenna 8, and a third leaf spring 9 having a ground terminal function.
The conductor 10 has a high frequency input/output function due to its restoring force.
When the leaf spring 9, which has a ground terminal function, is bent, it comes into contact with a conductor 10, which has a high frequency input/output function, due to its own restoring force, as shown in FIG. It is something.

Reference numeral 12 denotes an insulator that transmits the restoring force of the leaf spring 9 to the leaf spring 11 and is fixed to the leaf spring 9.

Reference numerals 13 and 14 indicate screws and nuts made of an insulator, which fix the leaf springs 9 and 11, the conductor 10, and the insulators 15 and 16 to form an integrated switch structure.

17 is the center conductor of the coaxial cable for measuring high frequencies during adjustment inspection and maintenance, 18 is the dielectric, 19 is the outer conductor, 20 is the outer sheathing material, and 21 is used to fix the coaxial cable and attach it to the external antenna mounting part 3. It is a metal screw to be attached, and is connected to the center conductor 17.

A metal shaft 22 is connected to the outer circumferential conductor 19.

23 is an insulator for integrating the metal shaft 22 with the metal screw 21.

Next, the operation of the above embodiment will be explained.

FIG. 1 shows a state in which the built-in antenna 8 is used without using the external antenna 2, and the insulated movable body 4 and the metal shaft 5 are pushed up by the coil spring 6.

One end of the built-in antenna 8 is connected in advance to the ground of the printed circuit board 7, and the leaf spring 11 connected to the other end becomes a leaf spring 10 having a high frequency input/output function due to the restoring force of the leaf spring 9. The built-in antenna forms a circuit as a loop antenna.

FIG. 2 shows a state in which the external antenna 2 is used.

The external antenna 2 has an external antenna mounting part 3 made of metal.
, and is connected to the high frequency input/output section of the printed circuit board 7 via a conductor 1o whose one end is spring-contacted to the mounting section 3 and has a high frequency input/output function, forming an antenna circuit. 4 and the metal shaft 5 with the coil spring 6
is pushed downward against the spring force.

Due to this action, the leaf spring 9 is bent by the metal shaft 5,
The leaf spring 11 connected to one end of the built-in antenna 8 is
Due to its own restoring force, it comes into a non-contact state with respect to the conductor connected to the high frequency input/output section of the printed circuit board 7, and disconnects the built-in antenna circuit.

That is, when the external antenna 2 is attached, it is automatically connected to the high frequency input/output section of the printed circuit board 7, forming an external antenna circuit, and at the same time, the built-in antenna circuit is automatically disconnected.

Figure 3 shows a state in which a coaxial plug is installed for measuring various high frequency characteristics during adjustment inspection and maintenance, and the center conductor 17 of the coaxial cable is made of metal with a metal screw 21 having a male thread. an external antenna mounting part 3; and a leaf spring 1 having one end in spring contact with the mounting part 3 and having a high frequency input/output function.
0, and is connected to the high frequency input/output section of the printed circuit board 7.

Further, the outer conductor 19 of the coaxial cable is connected to the metal shaft 22.
,5. It is connected to the ground of the printed circuit board 7 via a leaf spring 9 having a ground terminal function.

At this time, the insulating movable body 4 and the metal shaft 5 are pushed down by the metal shaft 22.

Due to this operation, the leaf spring 9 is bent, and the leaf spring 11 connected to one end of the built-in antenna 8 becomes non-contact with the conductor 10 connected to the high frequency input/output section of the printed circuit board 7 due to its own restoring force. The antenna circuit is disconnected.

That is, by installing the coaxial plug, the center conductor 17 of the coaxial cable is automatically connected to the high frequency input/output section of the printed circuit board 7, and the outer conductor 19 is connected to the ground of the printed circuit board 7, and the built-in antenna circuit is also disconnected. It is something to do.

As is clear from the above embodiments, according to the present invention, it is possible to automatically switch the antenna according to the attachment and detachment of the external antenna, and the handling is easy.

In addition, it is possible to reliably prevent loss of sensitivity and damage to the amplifier circuit due to forgetting to switch.

[Brief explanation of the drawing]

FIG. 1 is a sectional side view of a main part of a radio device according to an embodiment of the present invention, and FIGS. 2 and 3 are side sectional views of the same main part in different usage conditions. 1...Resin housing, 2...External antenna, 3...External antenna mounting part, 4...
Insulator, 8...Built-in antenna, 9.11...
...Plate spring, 10...Conductor.

Claims (1)

[Scope of utility model registration request] a mounting part for an external antenna made of metal attached to a housing; an insulated movable body inserted into the antenna mounting part and constantly biased upward by a coil spring; a built-in antenna housed in the housing; A changeover switch having first, second, and third conductive leaf springs is provided, and when the built-in antenna is used, one end of the first leaf spring contacts the mounting portion, and the other end contacts the high frequency input portion. When the connection is complete, one end of the second leaf spring is in elastic contact with the first leaf spring and the other end is connected to the output of the built-in antenna, and one end of the third leaf spring is in contact with the insulated movable body. The built-in antenna and the high-frequency input section are electrically connected by contacting the built-in antenna and the high-frequency input section by negatively applying a negative force to the second leaf spring contacting the first leaf spring through an insulating material. However, when an external antenna is used, by attaching the external antenna to the mounting part, the insulating movable body is pushed down and the third leaf spring is bent, thereby releasing the first leaf spring and the second leaf spring. The radio device switches between the built-in antenna and the external antenna by holding the built-in antenna in contact and separating the built-in antenna so that only the external antenna is connected to the high-frequency input/output section.