JPS6240804A - Small-sized portable transceiver - Google Patents

Abstract

PURPOSE:To make transmission/reception antennas small in size by connecting one end of the transmission/reception antennas to a plug of three terminals, and making the transmission antenna shorter than the reception antenna. CONSTITUTION:A high frequency signal from a transmitting circuit 2 is conducted electrically to one terminal of a jack 5, and this terminal contacts to a corresponding terminal of a plug 6 of three terminals, which is inserted, and transfers a signal to a transmission antenna 7. On the other hand, a sound signal from a receiving circuit 4 is supplied to two terminals of the jack 5, transferred to two corresponding terminals of the plug 6 which is inserted, and coupled to two lines of a reception antenna 8. As for the reception antenna 8, a coaxial cable is used in order to receive an FM radio wave and to execute a signal transfer to an earphone body 9. Also, the transmission antenna 7 is manufactured by an integral structure, and formed so as to be shorter than the antenna 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transmitting antenna and a receiving antenna for a small portable transceiver.

[Conventional technology]

Conventionally, many portable transceivers have been proposed and are commercially available. It has been customary to use rod antennas as the transmitting antenna and receiving antenna in this type of transceiver. Moreover, this is a foldable type, and is either stored in a part of the main body or fixed on the side of the main body (1 is usually fixed to a part of the upper or lower surface. With the size of a commonly used portable device, you don't have to think about the space too much,
In addition, the length of the antenna is within the range of the Radio Law, and it is possible to use an antenna with a length necessary to send the transmitted radio waves as far as possible.

[Problem that the invention seeks to solve]

However, in order to make conventional transceivers as small as a business card that can fit in a pocket or as a type that can be worn on the arm, it is necessary to have a power supply, a receiving circuit, a transmitting circuit, a receiving antenna, a transmitting antenna, etc. ,
It needs to be small. Among these, the transmitting circuit, receiving circuit, etc. can be made to a size that can be worn on the arm by adopting highly integrated circuits such as I and C1 and small electrical components, but the remaining problem is that The problem is how to miniaturize the transmitting antenna for transmitting the signals and the receiving antenna for receiving the signals transmitted from the other party.

If the transmitting and receiving antennas are short, the radio wave distance that the other party can reach will be short, and there is a risk that the transceiver will no longer function as a transceiver. An antenna and a receiving antenna are required.If you use a conventional rod antenna, it must have a length and diameter that can be worn on your arm, such as a length of 40 mm when stored, a length of 400 mm when extended, and a diameter of s mm. If you try to fit the rod antenna into a larger number of stages, the number of steps the rod antenna will have to extend will increase.

At least 22 stages or more are required. Moreover, the diameter is 8mm
.

In order to keep it within this range, the thickness of each stage of the antenna must be made thinner. Moreover, in order to extend or contract the rod antenna, its strength is also required. Although it is possible to manufacture this small rod antenna using conventional techniques, it is costly and expensive.

Moreover, when the transceiver is not in use and is worn on the arm, this rod antenna gets in the way.
Usually, the received voice can be heard using a speaker, but the arm type requires a smaller power supply, so it is necessary to use earphones to listen to the other party's voice (system). .

Instead of the above-mentioned rod antenna type, it is conceivable to use a common wire for the transmitting antenna and the receiving antenna. Moreover, it is conceivable to use the wire of the earphone for this purpose. In this case, the following new problem arises. For example, in the case of a transceiver that can perform short-distance communication within the range that does not require approval under the Radio Law and using the frequencies used for domestic broadcasting in Japan, the transmitting antenna and There also arises a need to change the length of the receiving antenna.

In addition, if the transceiver is small such as an arm-shaped transceiver, the earphones for listening to what the other party is saying and the antenna that transmits radio waves to convey the message to the other party are worn when in use, and removed when not in use. It is more convenient for the user to leave it there.

In order to solve the above-mentioned problems, the present invention provides a convenient antenna structure for a small portable transceiver in which a transmitting antenna and a receiving antenna are connected to a plug and are attached only when using them. It is.

[Means for solving problems]

”: In order to achieve the above object, the present invention has the following configuration. That is, the two wire lines connected to the earphone according to the present invention serve both as a receiving antenna for receiving radio waves and as a signal line for transmitting audio signals to the earphone, and the other wire line serves as a signal line for transmitting audio signals to the earphone. It serves as a transmitting antenna. Further, each wire wire is fixed to a three-terminal plug to facilitate attachment and detachment from the main body.

Further, a jack that is combined with the plug is provided on the main body side, and the jack is connected to an electronic circuit.

〔Example〕

Embodiments of the present invention will be described below based on the drawings. FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a plan view of an earphone that is the gist of the present invention. Figures 1 and 2
In the figure, 1 is a capacitor microphone that converts an audio signal into a change in capacitance, 2 is an oscillation modulation circuit that changes the oscillation frequency of a high frequency oscillation circuit according to the capacitance change of 1, and the frequency modulated high frequency This is a transmitting circuit that includes a circuit that amplifies the . The high frequency signal modulated and amplified by the transmitting circuit 2 is electrically connected to one terminal of the jack 5.

One terminal of the jack 5 connected to the transmitting circuit 2 contacts the corresponding terminal of the three-terminal plug 6 to be inserted, and transmits a signal to the transmitting antenna 7 that is electrically connected to that terminal. This transmitting antenna 7 is provided to radiate a high frequency signal into the air as an FM constant radio wave. This transmitting antenna 7
The length of the transceiver must be determined depending on the purpose, whether it is to be used as a transceiver that is approved by the Radio Law, or for short-range communication that is unlicensed and unregulated.

Reference numeral 4 denotes a receiving circuit including a circuit for demodulating the FM radio wave signal transmitted from the other party's transceiver into an audio signal and a circuit for amplifying the signal. Reference numeral 6 denotes a battery that supplies energy to the transmitting circuit 2 and the receiving circuit 4. The audio signal from the receiving circuit 4 is connected to two terminals of a jack 50 for electrical continuity. Two terminals of the jack 50 are in contact with two corresponding terminals of the plug 6 to be inserted, and electrical continuity is established. Two terminals of the plug 6 are connected to two lines of a receiving antenna 80. This receiving antenna 8
serves as a receiving antenna that receives FM radio waves, and at the same time serves as an earphone wire that transmits signals to the earphone 9 body.

This technique is a well-known technique employed in conventional FM receivers. In this embodiment, the wires to the earphone 9 shown in FIG. 2 are two coaxial cables, one centered around the receiving antenna 8 and one around the periphery. Furthermore, the transmitting antenna 7 is manufactured integrally with the receiving antenna 8.

Considering the length relationship between the transmitting antenna and the receiving antenna, since the receiving antenna also serves as the earphone wire, it is generally assumed that a length of 1 m is used. If this is taken as a standard, the length of the transmitting antenna will be determined depending on the relationship between the wavelength and the transmitting power, but it is desirable that the length be between about 15 cm and 85 crrL<L. Jack 5 mentioned above
As the plug 6, a well-known commercially available three-terminal product often used for stereo applications may be used, and detailed description thereof will be omitted.

In addition, a transmitting circuit used in the above-mentioned transceiver,
Since the receiving circuit and the receiving circuit may use conventionally known techniques, their circuit diagrams and explanations are omitted.

〔Effect of the invention〕

As is clear from the above explanation (the transmitting antenna and the earphone wire that also serves as the receiving antenna are connected to the same plug, and when using a transceiver, they are connected to the transmitting circuit and receiving circuit in the main unit. It is only necessary to insert the plug into the jack that is connected to the transceiver, and it is useful for, for example, a wrist-type transceiver 1 equipped with a watch or a small pocket-type transceiver, and a great effect can be achieved.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a transceiver showing an embodiment of the present invention, and FIG. 2 is a plan view of an earphone section which is the main part of the present invention. 2...Transmission circuit, 4...Reception circuit, 6...Plug, 7...Transmission antenna, 8...Reception antenna.

Claims (1)

[Claims] A transmitting circuit that frequency modulates and amplifies an audio signal, a transmitting antenna that radiates the high frequency generated by the transmitting circuit into the air, a receiving circuit that receives the high frequency and demodulates it into an audio signal, and a high frequency that is input to the receiving circuit. A compact device comprising an earphone wire that captures a signal and a receiving antenna, one end of which is connected to a three-terminal plug, and at the same time, the transmitting antenna is shorter than the receiving antenna. Portable transceiver.