JPH1131991A - Mobile communication equipment - Google Patents

Abstract

(57) [Problem] To provide a technology for reducing the intensity of electromagnetic waves emitted from an antenna in a brain in a mobile communication device such as a personal mobile telephone terminal. SOLUTION: In a mobile communication device having an antenna 211 for transmitting and receiving an electromagnetic wave and a microphone 225 for converting a sound to be transmitted into an electric signal,
By mounting the antenna near the microphone and moving the antenna away from the brain, the intensity of electromagnetic waves in the brain is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a mobile communication device,
Furthermore, the present invention relates to a technique for reducing the intensity of electromagnetic waves emitted from the antenna in the brain, and to a technique effective when applied to, for example, a personal mobile telephone terminal (PHS) as an example of a mobile communication device.

[0002]

2. Description of the Related Art A personal mobile telephone terminal (PHS), which is an example of a radio communication device, basically includes a high frequency section and a baseband section. The high frequency section includes a new function of transmitting and receiving electromagnetic waves, and mainly processes high frequency signals of 10 MHz or more. The baseband unit is a unit that processes digital signals of 10 MHz or less, and includes a modem for performing conversion (modulation and demodulation) between digital data and an analog signal suitable for wireless transmission, and synchronization control of digital data. It comprises a channel codec for performing the operation, an audio codec for performing digitization of audio and data compression / decompression, and a microcomputer for controlling the operation of each unit. In such a personal mobile telephone terminal, an antenna for transmitting and receiving electromagnetic waves is formed to protrude from an upper end of the personal mobile telephone terminal.

[0003] As an example of a document describing a mobile communication device, see MWE on December 12-14, 1995.
Microwave Workshop Digest (pages 319 to 323, 324 to 329).

[0004]

However, in consideration of the state of use of the conventional personal mobile telephone terminal, the antenna protruding from the upper end of the personal mobile telephone terminal is located very close to the head of the human body. Therefore, high-frequency electromagnetic waves emitted from the antenna may adversely affect the brain. In order to maintain human health, it is necessary to reduce electromagnetic waves as much as possible.

An object of the present invention is to provide a technique for reducing the intensity of electromagnetic waves emitted from an antenna in a brain in a mobile communication device such as a personal mobile telephone terminal.

The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0007]

The following is a brief description of an outline of a typical invention among the inventions disclosed in the present application.

That is, the antenna (211) is attached near the microphone (225). In the use state of the mobile communication device, the microphone is located near the mouth of the user, so if the antenna is located near the microphone, the distance between the antenna of the user's brain and the antenna can be increased. This reduces the intensity of electromagnetic waves emitted from the antenna in the brain.

Further, by mounting the antenna so that the distance from the microphone to the antenna is shorter than the distance from the speaker (224) to the antenna, the distance between the antenna of the user and the antenna can be increased. This reduces the intensity of the electromagnetic waves emitted from the antenna in the brain.

At this time, the antenna can be built in a case supporting the microphone and the speaker so that the antenna is not in the way.

When the power supply section (212) of the antenna is rotatably supported by the hinge mechanism (31), the distance between the antenna of the user and the antenna can be increased by tilting the antenna at the time of use. Sometimes raising the antenna can prevent it from getting in the way.

Further, the antenna can be provided so as to be able to freely enter and exit the case body supporting the speaker, and in that case, a microphone section incorporating the microphone can be attached to the tip of the antenna. Since the antenna is provided so as to be able to enter and exit the case body supporting the speaker, the antenna can be housed in the case body during standby, thereby reducing the size of the mobile communication device during standby. .

[0013]

FIG. 7 shows a functional block diagram of a personal mobile telephone terminal (PHS) as an example of a mobile communication device according to the present invention.

[0014] As shown in FIG.
Is composed of a high frequency (RF) unit 21 and a baseband unit 22, and enables wireless communication using electromagnetic waves.

The high-frequency section 21 modulates the high-frequency with the voice data transmitted from the baseband section 22 and emits an electromagnetic wave from the antenna 211 to enable transmission and reception at a high frequency. And a receiving system for receiving a target high-frequency signal via the communication system.

The baseband unit 22 includes a modem 221, a channel codec 222, an audio codec 223, a speaker 224, a microphone (microphone) 225, a microcomputer 226, a liquid crystal display (LCD) 227,
A keypad 228 and a memory 229 are included.

The modem 221 converts (modulates, demodulates) between digital data and an analog signal suitable for wireless transmission.
I do. The modulation method is π / 4 shift QPSK (Quadrutu
re Phase Shift Keying). The data transmission rate is 384 kbps, and the modulation rate is 192 kbaud.

The channel codec 222 is disposed between the modem and the voice codec 223, and controls digital data synchronization, TDMA / TDD control, privacy control, and so on.
It performs scramble control, error detection, voltage control of the high frequency unit 21, and the like.

The voice codec 223 performs voice digitization and data compression / decompression. ADP for compression and decompression
CM (Adaptive Differential Pulse CodeModulation)
64 kbps (8b /
1 sample, 8 kHz sampling) audio data
/ 32 kbps, and the reverse (expansion) of such compression is performed.

The microcomputer 226 controls the operation of the entire system including the high frequency unit 21 and the baseband unit 22 according to a predetermined program. The microcomputer 226 performs man-machine interface control such as execution of communication protocol processing, key analysis of operation of the keypad 228, and display control of various information on the liquid crystal display unit 227.

The memory 229 stores a system control program executed by the microcomputer 226, user information of a person who operates the PHS, system parameters, and the like, which are read out by the microcomputer 226 as necessary. It has become.

FIG. 1 shows the appearance of the PHS 14.

A speaker 224 for outputting sound is attached to the upper end of the main body case of the PHS 14, and an LCD 227 for displaying various information is provided near the speaker 224.
Is attached. A switch pad 228 is arranged below the LCD 227.
A microphone 225 for capturing audio is attached to the lower end of the main case.

In this configuration example, an antenna 211 for transmitting and receiving electromagnetic waves is formed so as to protrude from the lower end of the main case of the PHS 14. That is, the antenna 211 is attached not to the vicinity of the speaker 224 but to the vicinity of the microphone 225 in order to reduce the intensity of the electromagnetic wave emitted from the antenna in the brain.

FIG. 2 shows a use state of the PHS 14 having the above configuration.

By mounting the antenna 211 near the microphone 225, the antenna 211 and the human head 1
The distance to the brain 11 within 0 is longer than when the antenna is mounted near the speaker. In other words, the antenna 211 can be kept away from the brain 11 in the human head 10.

For example, in the case of a conventional PHS in which the antenna is mounted near the speaker, the distance between the antenna and the brain is only about 2 cm, whereas the antenna 211 is not shown in FIGS. The distance between the antenna 211 and the brain 11 when attached near the microphone 225 is about 8 cm. Since the intensity of the electromagnetic wave is attenuated in inverse proportion to the square of the distance, the effect of the electromagnetic wave on the brain 11 of the user of the PHS 14 is 1 / one of that of the conventional PHS.
Reduce to 16.

FIGS. 3 to 6 show another example of the configuration of the PHS according to the present invention.

In FIG. 3, a part of the PHS 14 is cut out so that the antenna 2
11 is built in the PHS 14. That is, the antenna 211 is formed in a film shape and attached to the inner wall surface at the lower end of the PHS 14. The main body case of the PHS 14 is made of resin, and
Even if it is built into the main body case, it does not hinder the transmission and reception of electromagnetic waves. Even when the antenna 211 formed in a film shape is built in the PHS 14,
By arranging the film-shaped antenna 211 near the microphone 225 (see FIG. 1), the antenna 211 can be moved away from the brain 11 in the use state of the PHS 14, which is different from the case of the configuration example shown in FIG. Similar functions and effects can be obtained.

The PHS 14 shown in FIGS. 4A and 4B
Is connected to the PHS1 from the antenna 211 by the hinge mechanism 31.
4 is supported so as to be rotatable in the direction of arrow 32 around the feeder 212 of the antenna. FIG.
(A) is a state in which the antenna 211 is raised, and the state is a standby state. FIG. 4B shows a state in which the antenna is tilted. In this state, the distance between the antenna 211 and the brain 11 during a call is wider than that in a state in which the antenna 211 is raised. Talking in a state in which the communication is performed has the same effects as those of the configuration shown in FIGS. In the standby state, if the antenna 211 is raised as shown in FIG. 4A, the antenna 211 does not need to be in the way.

The antenna 211 and a hinge mechanism for rotatably supporting the antenna 211 may be provided on the back of the main body case of the PHS 14.

FIGS. 5 (a) and 5 (b) show the PH
The microphone unit 141 is configured to be separable from the main body of S14. That is, in the standby state of the PHS 14, the main body of the PHS 14 and the microphone unit 141 are integrated as shown in FIG.
As shown in (b), the microphone section 141 is separated from the main body of the PHS 14, and the antenna 211 is exposed. In this case, the antenna 211 also serves as a support for supporting the microphone section 141 from the main body side of the PHS 14.

FIGS. 6A and 6B show FIGS.
In the PHS 14 shown in (b), a mechanism for separating the microphone section 141 from the main body of the PHS 14 is shown. FIG. 6A shows a standby state, and FIG. 6B shows a use state.

One end of the cylindrical antenna 211 is attached to the main body of the PHS 14 via a spring 61 which is an example of an urging member, and the other end is fixed to the microphone 141. A guide rail 68 is attached to the antenna 211 in the longitudinal direction. A plurality of teeth are provided on the guide rail 68, and the microphone section 141 can be moved in the direction of the arrow 80 within the range of formation of the teeth. At the end of the guide rail 68, a stopper 70 is formed.
Of the microphone 14
1 movement is regulated. Further, a push button 63 for supporting the start of a call is provided on a side surface of the main body of the PHS 14. This push button 63 is
The main body of the HS 14 is rotatably supported. The push button 63 has a stopper 71 extending therefrom. In a standby state, the stopper 71 is
By being locked to the locking portion 65 provided in
The main body of the PHS 14 and the microphone unit 141 are integrated.
When the push button 63 is pressed, the locking portion 71 is rotated about the pin 64, and when the stopper 71 is released from the locking portion 65, the antenna 211 is moved downward by the urging force of the spring 61, The main body of the PHS 14 and the microphone unit 141 are separated. The antenna 211 is moved along the guide rail 68, and eventually stops in a state where the stopper provided on the guide rail 68 is in contact with the locking portion 67 (the state of FIG. 6B). PHS14 body and microphone unit 1
When the switch 41 is separated, the sensor switch 12 attached to the main body of the PHS 14 via the spring 12 is moved downward by the urging force of the spring 12, and is turned on. When the sensor switch 12 is turned on, the PHS 14 is shifted from the standby state to the use state. In this use state, the antenna 211
Has been moved away from the user's brain. Therefore, as in the case of the above-described example, the intensity of electromagnetic waves emitted from the antenna in the brain can be reduced.

The microphone switch 141 is pushed back against the urging force of the spring 61 to bring it into the state shown in FIG. 6A, whereby the sensor switch 12 is turned off, whereby the use state is terminated. It is shifted to the standby state.

Although the invention made by the inventor has been specifically described based on the embodiment, it is needless to say that the present invention is not limited to the embodiment and can be variously modified without departing from the gist of the invention. No.

In the above description, the case where the invention made by the present inventor is mainly applied to a personal mobile telephone terminal, which is a field of use as a background, has been described. The present invention can be applied to various mobile communication devices such as a telephone and a portable transceiver.

The present invention can be applied on condition that at least an antenna is provided.

[0039]

The effects obtained by typical ones of the inventions disclosed in the present application will be briefly described as follows.

That is, in the use state of the mobile communication device, the microphone is located near the mouth of the user. Therefore, if the antenna is located near the microphone, the distance between the user's brain and the antenna is increased. Therefore, the intensity of electromagnetic waves emitted from the antenna in the brain can be reduced.

Further, by mounting the antenna such that the distance from the microphone to the antenna is shorter than the distance from the speaker to the antenna,
The distance between the user's brain and the antenna can be widened, thereby reducing the intensity of electromagnetic waves emitted from the antenna in the brain.

If the antenna is built in the case supporting the microphone and the speaker, the antenna does not protrude outside the case, so that the antenna does not interfere.

When the power feeding portion of the antenna is rotatably supported by a hinge mechanism, the distance between the user's brain and the antenna can be increased by tilting the antenna during use, and the antenna can be raised during standby. The antenna can be prevented from being in the way.

Furthermore, the antenna can be provided so as to be able to freely enter and exit the case body supporting the speaker. In this case, a microphone section containing the microphone can be attached to the tip of the antenna. Since the antenna is provided so as to be able to enter and exit the case body supporting the speaker, the antenna can be housed in the case body during standby, thereby reducing the size of the mobile communication device during standby. .

[Brief description of the drawings]

FIG. 1 shows an example of a mobile communication device P according to the present invention.
It is an external appearance perspective view of HS.

FIG. 2 is an explanatory diagram of a use state of the PHS shown in FIG.

FIG. 3 is a partially cutaway perspective view showing another configuration example of the PHS.

FIG. 4 is a perspective view showing another configuration example of the PHS.

FIG. 5 is a partially cutaway perspective view showing another configuration example of the PHS.

FIG. 6 is an explanatory diagram of a mechanism of the PHS shown in FIG. 5;

FIG. 7 is a functional block diagram of the PHS.

[Explanation of symbols]

 21 High frequency section 22 Baseband section 31 Hinge mechanism 141 Microphone section 211 Antenna 221 Modem 222 Channel codec 223 Audio codec 224 Speaker 225 Microphone 226 Microcomputer 227 LCD 228 Keypad 229 Memory

Claims (5)

[Claims] 1. A mobile communication device having an antenna for transmitting and receiving an electromagnetic wave and a microphone for converting a sound to be transmitted into an electric signal, wherein the antenna is attached near the microphone. A mobile communication device characterized by the above-mentioned. 2. An antenna for transmitting and receiving an electromagnetic wave, a microphone for converting sound to be transmitted into an electric signal, and a speaker for converting a signal received via the antenna into sound. The mobile communication device according to claim 1, wherein the antenna is attached so that a distance from the microphone to the antenna is shorter than a distance from the speaker to the antenna. 3. The mobile communication device according to claim 1, wherein the antenna is built in a case body that supports the microphone and the speaker. 4. The mobile communication device according to claim 1, wherein the power supply portion of the antenna is rotatably supported by a hinge mechanism. 5. The moving device according to claim 1, wherein the antenna is provided in a case body supporting the speaker so as to be able to enter and exit freely, and a microphone unit incorporating the microphone is attached to a tip of the antenna. Body communication equipment.