JPH04335739A - Portable radio telephone set - Google Patents

Abstract

PURPOSE:To obtain the portable radio telephone set with small size in which talking is available in a clear voice. CONSTITUTION:A reception speaker 12 is built in an upper part of a telephone set main body 10. A transmission reception antenna 15 is provided downward from a lower part of the telephone set main body 10. A transmission microphone 13 is provided to the transmission reception antenna 15 or the mount of the telephone set main body 10 of the transmission reception antenna 15. A throughhole 17 through which sound is collected from the microphone 13 is provided around the transmission reception antenna 15. The antenna 15 acts like a voice tube, the sound uttered by the user is collected by the antenna 15 and transmitted to the microphone 13 through the antenna 15.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to portable radio telephones such as mobile telephones, cordless telephone handsets, and transceivers.

0002

2. Description of the Related Art A mobile phone generally has an appearance as shown in FIG. That is, the case (housing) 1 is made of plastic material and has an almost rectangular parallelepiped shape as a whole, and a speaker 2 for receiving calls is arranged at the upper part of the front face, and a microphone 3 for sending calls is arranged at the lower part of the front face. has been done.

[0003] Further, an operation key 4 such as a dial key is arranged at the center of the front surface of the case 1, and a transmitting/receiving antenna 5 is provided at the top.

0004

By the way, in the mobile phone shown in FIG. 7, the distance between the speaker 2 and the microphone 3 is naturally adjusted to match the distance between the user's ear and mouth.

[0005] However, as mobile phones are made smaller in order to improve portability, the distance between speaker 2 and microphone 3 must be reduced. Since the microphone 3 is used against the user's ear, it becomes difficult to collect the voice emitted by the user because the microphone 3 is separated from the user's mouth, making it difficult to communicate with clear voice.

[0006] This invention attempts to solve these problems.

[0007]

[Means for Solving the Problems] Therefore, in the present invention, if the reference numerals of each part correspond to the embodiments described later, there is a speaker 1 for receiving calls built in the upper part of the telephone main body 10.
2, a transmitting/receiving antenna 15 provided downward from the bottom of the telephone main body 10, and this transmitting/receiving antenna 1.
5, or a microphone 13 for transmitting speech provided at the attachment part of the telephone main body 10 of the transmitting/receiving antenna 15, and a through hole 17 provided around the transmitting/receiving antenna 15 for collecting sound for the microphone 13. .

[0008]

[Operation] The antenna 15 acts as a speaking tube, and the voice emitted by the user is collected by the antenna 15 and transmitted to the microphone 13 through the antenna 15.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of the external appearance of a mobile phone according to the present invention, and FIG. 2 shows a longitudinal cross-section of its main parts. In these figures, reference numeral 10 indicates a main body of a mobile phone according to the present invention, and reference numeral 11 indicates a case thereof, which is made of plastic and has an approximately rectangular parallelepiped shape as a whole.

A speaker 12 for receiving calls is built into the upper part of the front surface of the case 11, and operation keys 14 such as dial keys are arranged from the center to the lower part of the front surface. Further, a transmitting/receiving antenna 15 is provided at the bottom of the case 11 facing downward. As shown in FIG. 2, the antenna 15 is made of a hollow conductive pipe, and one end 151 of the antenna 15 is fixed to the bottom of the case 11.

A microphone 13 for receiving calls is provided inside the antenna 15 on the end 151 side. In this case, the microphone 13 is provided so that the center of its directivity faces the tip 152 of the antenna 15.

Further, a bushing 16 is provided between the outer circumference of the microphone 13 and the inner circumference of the antenna 15, so that the outer circumference of the microphone 13 and the inner circumference of the antenna 15 are connected to each other.
The antenna 15 is electrically insulated from the microphone 13 so that the sound output from the speaker 12 into the case 11 does not leak to the front side of the microphone 13. There is.

Furthermore, the tip 152 side of the antenna 15 is blocked, and the peripheral surface near the tip 152 is
A through hole 17 for collecting sound is formed in the front peripheral surface of the telephone main body 10.

The microphone 13 is connected to a circuit described later through a low-pass filter 21, and the antenna 15 is connected to a circuit described later through an antenna duplexer 24. In this case, the low-pass filter 21 is
This is to prevent the transmitted signal and received signal generated at the antenna 15 from being bypassed through the audio signal line from the microphone 13.

In this configuration, when making a call, the user holds the telephone main body 10 so that the antenna 15 faces downward. That is, when the speaker 12 is held so as to touch the ear, the through hole 17 of the antenna 15
is located in front of the mouth.

Therefore, when the user speaks something, the voice is collected by the through hole 17 and is supplied to the microphone 13 through the inside of the antenna 15, and the voice signal is extracted from the microphone 13. That is, the antenna 15 functions as a speaking tube, and the voice emitted by the user is transmitted to the microphone 13 through the antenna 15.

Therefore, the telephone main body 10 can be made smaller, and the voice uttered by the user can be collected at a sufficient volume, making it possible to have a clear conversation.

For example, in a mobile phone, the wavelength of radio waves used is about 30 to 40 cm (frequency 0.8 to 1
GHz), and the length of the antenna 15 is 1/1 of the wavelength.
4 or 1/2, the actual length of the antenna 15 (the length extending outside from the case 11) is 10 to 1/2.
It is 20cm. Therefore, when the speaker 12 is placed against the user's ear, the sound collection hole 17 can be brought just in front of the user's mouth, and the sound emitted by the user can be reliably collected.

FIG. 3 shows an example of the transmitting/receiving circuit of the telephone main body 10, in which the output signal of the microphone 13 is supplied to the audio processing circuit 22 through the low-pass filter 21, and is subjected to signal processing for transmission. Transmission circuit 23
This transmission signal is supplied to the antenna 15 through the antenna duplexer 24 and transmitted to the base station.

[0020] Further, a down channel transmission signal from the base station is received by the antenna 15, this signal is supplied from the antenna 15 to the reception circuit 25 through the duplexer 24, and its demodulated output is supplied to the reception processing circuit 26. The audio signal from the other party is extracted, and this audio signal is supplied to the speaker 12.

Furthermore, 27 is a system control microcomputer, and the entire operation of the telephone body 10 is controlled by this microcomputer 27.

Although not shown, these circuits 21 to 27, batteries, etc. are provided inside the case 11.

Thus, according to the present invention, the transmitting/receiving antenna 15 is provided at the bottom of the telephone main body 10, and by making the antenna 15 act as a speaking tube, the voice emitted by the user is collected and supplied to the microphone 13. Therefore, the telephone main body 10 can be made smaller and calls can be made with clear voice.

[0024] Also, the speaker 22 and the microphone 13
Since the telephone main body 10 can be sufficiently separated acoustically, howling is less likely to occur even if the telephone main body 10 is downsized.

Furthermore, compared to the conventional mobile phone shown in FIG. 7, the antenna 15 is located further away from the user's head, which reduces the interference caused by the head to the transmitted and received waves, and also reduces the influence of the transmitted waves on the user's auditory organs. The impact will also be smaller.

4 to 6 are sectional views corresponding to FIG. 2 of other examples of the present invention. In the example shown in FIG. 4, the microphone 13 is provided so as to face the end 151 of the antenna 15 and to be acoustically coupled to the antenna 15 when the antenna 15 acts as a speaking tube. be.

[0027] Also, in this example, the through hole 1 for collecting sound
7 is provided at a position near the center of the antenna 15. Therefore, according to this example, even when the transmitting/receiving frequency is low and the antenna 15 is long, such as in a cordless telephone, sound can be collected exactly at the position of the mouth.

Furthermore, in the example shown in FIG. 5, the microphone 13 is provided at the tip 152 of the antenna 15. And according to this example, the same case 1
Since the speaker 12 and the microphone 13 are not located inside the main body 10, howling is less likely to occur even if the main body 10 is downsized.

In the example shown in FIG. 6, a pipe 18 made of an insulating material such as a plastic material is provided in place of the antenna 15, and a sound collecting device is provided on the circumferential surface of the pipe 18 on the tip 182 side. A through hole 17 is formed, and a microphone 13 is provided therein. A signal line 19 for the output signal of this microphone 13 is connected to a low-pass filter 21 and an antenna duplexer 2
Connected to 4.

Therefore, sound is collected in the same manner as in the example shown in FIG. 5, and the signal line 19 acts as the antenna 15.

In the above description, the antenna 15 can also be of a pull-out type or a foldable type. Moreover, the speaker 12 can be provided at the position of the microphone 13, and the microphone 13 can also be provided at the position of the speaker 12.

[0032]

[Effect of the invention] According to the present invention, the transmitting and receiving antenna 15
is provided at the bottom of the telephone main body 10, and the antenna 15 acts as a speaking tube to collect the voice emitted by the user and supply it to the microphone 13. Therefore, the telephone main body 10 can be made smaller. At the same time, you can make calls with clear voice.

[0033] Also, the speaker 22 and the microphone 13
Since the telephone main body 10 can be sufficiently separated acoustically, howling is less likely to occur even if the telephone main body 10 is downsized.

Furthermore, compared to conventional portable radio telephones,
Since the antenna 15 is moved away from the user's head or eyes, the interference caused by the head to transmitted and received waves is reduced, and
The influence of the transmitted waves on the user's auditory organs is also reduced.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an example of the present invention.

FIG. 2 is a sectional view of essential parts of an example of the present invention.

FIG. 3 is a system diagram of an example of a transmitting and receiving circuit.

FIG. 4 is a sectional view of a main part of another example of the invention.

FIG. 5 is a sectional view of a main part of another example of the present invention.

FIG. 6 is a sectional view of a main part of another example of the invention.

FIG. 7 is a perspective view of a conventional example.

[Explanation of symbols]

10 Mobile phone body 11 Case 12 Speaker 13. Microphone 14 Operation keys 15 Transmitting and receiving antenna 16 Bushing 17 Sound collection through hole 21 Low pass filter 23 Transmission circuit 24 Antenna duplexer 25 Receiving circuit 27 Microcomputer

Claims (2)

[Claims] Claim 1: A speaker for receiving calls built into the upper part of the telephone body, a transmitting/receiving antenna provided downward from the bottom of the telephone body, and the transmitting/receiving antenna, or attachment of the transmitting/receiving antenna to the telephone body. What is claimed is: 1. A portable radio telephone having a microphone for transmitting speech provided at a portion thereof, and a through hole provided around the transmitting/receiving antenna for collecting sound for the microphone. 2. A microphone for transmitting speech built into the upper part of the telephone main body, a transmitting/receiving antenna provided downward from the lower part of the telephone main body, and the transmitting/receiving antenna or the transmitting/receiving antenna of the telephone main body. What is claimed is: 1. A portable radio telephone comprising: a speaker for receiving calls provided on a mounting portion; and a through hole provided around the transmitting/receiving antenna for outputting sound from the speaker.