JP2577816Y2 - Wireless transmission device - 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 transmitting apparatus for converting transmission data into a radio frequency signal and outputting the radio frequency signal.

[0002]

2. Description of the Related Art As a method of wirelessly transmitting an audio signal or data to another device, a method of modulating a high-frequency carrier with a signal to be transmitted and transmitting the modulated signal is known. In this method, a signal is transmitted by modulating a carrier with a signal to be transmitted on a transmitter side, transmitting the modulated signal from an antenna, and demodulating a radio frequency signal received on a receiver side.

When transmitting a signal by the above method, it is necessary to provide an antenna corresponding to the wavelength of a carrier in a transmitter and a receiver. However, in a small device that requires portability, the antenna length cannot be made too long, and it has been difficult to increase the signal transmission efficiency.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a radio transmitting apparatus capable of transmitting radio signals to the outside with a simple structure and extremely efficiently.

[0005]

SUMMARY OF THE INVENTION The present invention is characterized in that, when a second conductive member provided so as to be able to be pressed from the front side of the apparatus main body is pressed, in response to the pressing operation, A) transmission with the second conductive member is performed. The other end of the antenna of the circuit unit is electrically connected to each other,
The wireless signal supplied from the transmission circuit unit is transmitted to the second conductive member side, and B) the wireless signal supplied from the transmission circuit unit is electrically connected to one end of an antenna terminal of the transmission circuit unit. The point is that the data is sent to the connected first conductive member.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In this embodiment, the wireless transmission device of the present invention is applied to an electronic wristwatch. FIG. 1 is an external front view of an electronic wristwatch according to an embodiment, and FIG. 2 is a sectional view of a main part thereof.

As shown in FIGS. 1 and 2, an electronic wristwatch provided with a wireless transmission device according to this embodiment has a wristwatch case 1 constituting a device body and a wireless signal transmission device for transmitting wireless signals to the outside. A transmission circuit 17 (see FIG. 3), which is a transmission circuit unit having an antenna terminal, provided on the watch case 1;
A back cover 8 which is a first conductive member electrically connected to one end 9 of an antenna terminal of the transmission circuit 17 via a spring 10
A first terminal provided on the wristwatch case 1 so as to be able to be pressed from the front side of the wristwatch case 1 so as to be electrically connected to the other end 12 of the antenna terminal of the transmission circuit 17.
When the push button switch 5 is pressed, the push button switch 5 and the other end 12 of the antenna of the transmission circuit 17 are electrically connected to each other. The radio signal supplied from the transmission circuit 17 is transmitted to the push button switch 5 side, and the radio signal supplied from the transmission circuit 17 is transmitted
The transmission circuit 17 includes a CPU 13 (see FIG. 3) which is a wireless signal transmission unit for transmitting the signal to the back cover 8 side electrically connected to one end 9 of the antenna terminal. In such a configuration, the back cover 8 of the watch case 1 of the wristwatch is attached to, for example, the left arm. With the back cover 8 in contact with a part of the human body, the push button switch 5 is pressed with the finger of the other right arm. When the push operation is performed and the push button switch 5 comes into contact with a part of the human body, the wireless signal supplied from the transmission circuit 17 is responded to the one end 9 of the antenna terminal of the transmission circuit 17.
It is sent out to the entire left arm through the back cover 8. Further, since the radio signal flows to the right arm finger push button switch 5 and the other end 12 of the antenna terminal of the transmission circuit 17, an open loop of the radio signal is formed therefrom, and the radio signal output from the transmission circuit 17 is transmitted to the entire human body. Is transmitted to space as an antenna. Hereinafter, details of such a configuration will be described. That is, in FIG. 1, a liquid crystal display (LCD) 3 for displaying the date and the current time is provided at the center of the watch case 1, and the front of the liquid crystal display 3 is covered with a watch glass 2. The lower part of the liquid crystal display unit 3 has a microphone-use speed force 4 for capturing sound to be transmitted to an external device, and a conductive material that when pressed with a finger, electrically connects the finger to an output terminal of a transmission circuit 17 described later. And a push button switch 5 comprising:

On the side of the watch case 1, there are provided switches S1, S2, etc., which are operated to correct the time or to take in and transmit an audio signal. In the sectional view of FIG. 2, the watch glass 2 is fixed to the watch case 1 by a packing 6.

The metallic back cover 8 is in contact with one end 9 of an antenna terminal of a transmitting circuit provided on the circuit board 7 via a conductive spring 10. These back cover 8 and spring 10
Corresponds to the first conductive member.

The other end 1 of the antenna terminal of the transmitting circuit is provided below the conductive leaf spring 11 with which the push button switch 5 contacts.
The leaf spring 11 comes in contact with the antenna terminal 12 when the push button switch 5 is pressed with a finger. The push button switch 5 and the leaf spring 11 correspond to a second conductive member.

Next, the circuit configuration of the electronic wristwatch will be described with reference to FIG. Referring to FIG.
A central processing unit that executes key processing, time counting processing, transmission processing, and the like in accordance with the control program stored in M14, stores data obtained by timing processing and the like in the RAM 15, and stores the data in the liquid crystal display unit 3. Display.
In addition, a key operation signal is input to the CPU 13 from the key input unit 16 including the S1 and S2 switches described above.

The transmission circuit 17 is a circuit for converting an audio signal input from the microphone 4 into a radio frequency signal.
It operates in accordance with the transmission instruction signal a from 3 and supplies the converted radio frequency signal to the antenna terminals 9 and 12.

One end 9 of the antenna terminal of the transmitting circuit 17
Is electrically connected to the back cover 8 so that the arm on which the watch is mounted and one end 9 of the antenna terminal are electrically connected. Also, the other end 1 of the antenna terminal of the transmission circuit 17
Numeral 2 is electrically connectable to the push button switch 5 via the leaf spring 11, and electrically connects a finger for operating the push button switch 5 to the other end 12 of the antenna terminal.

Therefore, when the push button switch 5 is pressed with the finger of the right hand while the electronic wristwatch is mounted on the left arm, the transmission circuit 17
A closed loop is formed by one end 9 of the antenna terminal 9-back cover 8-left arm-body-right arm-finger-push button switch 5-the other end 12 of the antenna terminal, and a radio frequency signal output from the transmission circuit 17 forms this loop It is sent out into space using the human body as an antenna. In this case, the entire body between the left arm on which the timepiece is worn and the right arm in contact with the push button switch 5 functions as an antenna, so that the area for radiating signals increases and the signal transmission efficiency increases.

Next, a second embodiment of the present invention in which the back cover 8 is connected to the reference potential of the circuit except during transmission will be described with reference to FIG. In FIG. 4, the back cover 8 is a gate 21.
The transmission instruction signal a output from the CPU 13 is input to the control terminal of the gate 21 via the inverter 23 through the control terminal of the gate 21. Since the transmission instruction signal a is at a low level except during the transmission of the audio signal, the gate 23 is turned on and the back cover 8 is at the same potential as the positive electrode of the battery 22.

One of the output terminals of a transmission circuit 17 is connected to the back cover 8 via a gate 24. A transmission instruction signal a output from the CPU 13 is input to a control terminal of the gate 24. ing. When the transmission instruction signal a goes high during transmission of the audio signal, the gate 24 is turned on, and one of the output terminals of the transmission circuit 17 is electrically connected to the back cover 8.

A switch 25 is connected to the other output terminal of the transmission circuit 17. The switch 25 corresponds to the leaf spring 11 and the push button switch 5 shown in FIG. 2, and is turned on when the switch 25 is operated by a finger, and the other of the operated finger and the output terminal of the transmission circuit 17 And are electrically connected.

The switch 25 is not limited to a mechanical switch, but may be configured as a circuit with a transmission gate, for example. In this case, if one end of the gate is connected to a conductive member provided on the surface of the watch case 1 and the gate is turned on when the transmission instruction signal a is output, the conductive member can be touched with a finger during transmission. Thus, the radio frequency signal output from the transmission circuit 17 can be transmitted using the human body as an antenna.

Alternatively, the other output of the transmission circuit 17 may be directly connected to a conductive member provided on the surface of the watch case 1 without specially providing a mechanical or electrical switch.

The other circuit 26 is the same as the RO circuit shown in FIG.
It is a circuit such as the M14, the RAM 15, the display unit 3, and the like. In the above-described circuit, when the transmission of the audio signal is instructed by the user, the gate 21 is turned off and the gate 24 is turned on, and the back cover 8 is electrically connected to one of the output terminals of the transmission circuit 17. In this state, when the switch 25 is operated with the finger of the arm opposite to the arm on which the timepiece is worn, the other of the output terminals of the transmission circuit 17 is electrically connected to the operated finger. As a result, one of the output terminals of the transmission circuit 17—the arm that contacts the back cover 8—the body—
A loop is formed at the other of the output terminal of the finger-transmitting circuit 17 that has operated the switch 25, and the radio frequency signal output from the transmitting circuit 17 is emitted outside using the human body as an antenna. Thereby, signals can be transmitted with high efficiency without providing a special antenna.

Also, except during transmission, the positive electrode of the battery 22 is electrically connected to the back cover 8 and the positive electrode of the battery 22 is grounded to the human body, so that the influence of external noise and the like can be reduced. it can.

In the above embodiment, the case where the audio signal is transmitted wirelessly has been described.
Alternatively, data stored in a memory such as a RAM or a ROM may be wirelessly transmitted. Alternatively, a bar antenna or the like may be connected to the antenna terminals 9 and 12, and transmission may be performed using both the bar antenna and a human body antenna.

The present invention can be applied not only to the wristwatch described in the embodiment but also to various small electronic devices. For example,
In portable equipment, the part that the user holds with one hand and the part that the user can touch with the other hand during use is made of a conductive material, and the output of the transmission circuit is connected to each conductive material. Thus, a similar effect can be obtained.

[0024]

According to the present invention, when a second conductive member provided so as to be able to be pressed from the front side of the apparatus main body is pressed, in response to this, A) the second conductive member And the other end of the antenna of the transmission circuit section are electrically connected to each other, so that the radio signal supplied from the transmission circuit section is transmitted to the second conductive member side and B) supplied from the transmission circuit section. The transmitted wireless signal can be transmitted to the first conductive member side electrically connected to one end of the antenna terminal of the transmission circuit unit. For this reason, for example, in a state where the first conductive member provided on the back side of the apparatus main body is mounted on one arm, a pressing operation can be performed from the front side of the apparatus main body with the finger of the other arm. In response to the pressing operation of the second conductive member provided in (2), in response to the pressing operation, (A) the wireless signal supplied from the transmission circuit unit is transmitted to the second conductive member side, and (B) the wireless signal is transmitted. The wireless signal supplied from the circuit portion can be transmitted to the first conductive member side electrically connected to one end of the antenna terminal of the transmission circuit portion,
Therefore, the wireless signal can be efficiently transmitted to the outside by using the human body as an antenna.

[Brief description of the drawings]

FIG. 1 is an external front view of a first embodiment of the present invention.

FIG. 2 is a sectional view of the first embodiment.

FIG. 3 is a circuit configuration diagram of the first embodiment.

FIG. 4 is a diagram showing a main part of a circuit configuration diagram of a second embodiment.

[Explanation of symbols]

 5 Push button switch 8 Back cover 9, 10 Antenna terminal

Claims (1)

(57) [Scope of request for utility model registration] An apparatus main body, a transmission circuit section provided with an antenna terminal for transmitting a radio signal to the outside, the transmission circuit section being provided on a rear surface side of the apparatus main body, A first conductive member electrically connected to one end of the antenna terminal, and the device body from the front side of the device body so as to be electrically connected to the other end of the antenna terminal of the transmission circuit unit. A second conductive member provided so as to be able to be pressed, and, when the second conductive member is pressed, in response to the second conductive member, the second conductive member and the other end of the antenna of the transmission circuit unit. Are electrically connected to each other to transmit the wireless signal supplied from the transmission circuit unit to the second conductive member side, and to transmit the wireless signal supplied from the transmission circuit unit to the transmission circuit unit. Electrically connected to one end of antenna terminal A wireless signal transmitting unit for transmitting the signal to the first conductive member.