JP2002368859A - Portable terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable terminal provided with a speaker that provides functions of a hands-free speaker and a receiver to the speaker and one system of a voice output circuit of which is enough so as to reduce the space of a board and the power consumption thereby allowing a user to listen to a voice signal in which production of white noise or distortion can be suppressed. SOLUTION: The portable terminal 1 provided with the speaker 3 is characterized in the provision of a changeover means 30 that changes an area of a diaphragm 12 of the speaker 3. The area of the diaphragm 12 is selected to be a diaphragm of e.g. a hands-free speaker or a receiver.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable terminal device having a speaker, and more particularly to a portable terminal device capable of changing the area of a diaphragm of the speaker.

[0002]

2. Description of the Related Art Among portable terminal devices, for example, portable telephones are provided which have a function of hands-free voice listening in addition to a function of voice listening by a receiver. As means for mounting a hands-free function on this kind of mobile phone, there are a method of separately preparing a receiver and a speaker for hands-free, and a method of using the receiver also for the hands-free function. In a method of separately preparing a receiver and a hands-free speaker, a method of installing a hands-free speaker on the back of a case is usually adopted. As such a mobile phone, there has been proposed a mobile phone that uses a hands-free speaker on the back side of a case and also has a ringer function such as a ringtone or a ringtone.

In a method in which a receiver also has a hands-free function, an electric signal for driving the receiver is
A method has been proposed in which an audio signal is converted into a pseudo-rectangular wave and the receiver is driven by the pseudo-rectangular wave, and a method in which the audio signal is not supplied to the normal receiver but is amplified at a predetermined level to drive the receiver. ing.

[0004]

However, in the method of separately preparing the receiver and the hands-free speaker, it is necessary to obtain two systems of audio output.
It is necessary to prepare two audio output circuits. For this reason,
There is a problem that the circuit space on the substrate is enlarged and that power consumption is increased. In addition, since the hands-free speaker is mounted on the back of the mobile phone, the directivity of sound is reversed with respect to the front of the mobile phone. There is a problem that it becomes difficult to take.

[0005] Further, in the method in which the receiver also serves as a hands-free function, in order to secure a sound volume at the time of hands-free, a method of converting an audio signal for driving the receiver into a pseudo rectangular wave is used. However, there is a problem in that white noise is generated by a rectangular wave from the receiver during reproduction, and the sound becomes muddy. In the method of amplifying an audio signal to a level higher than the driving level of a normal receiver, the receiver is driven with its original function expanded, so that the audio is distorted and output. There is a problem that it is distorted and difficult to hear, and conversation cannot be performed smoothly.

[0006] The present invention has been made in view of such circumstances, and an object of the present invention is to enable a speaker to function as a hands-free speaker or a receiver in a portable terminal device having a speaker. An object of the present invention is to provide a portable terminal device in which an output circuit can be formed into a single system and board space and power consumption can be reduced. Another object is to provide a portable terminal device capable of listening to an audio signal in which occurrence of white noise and distortion is suppressed.

[0007]

In order to achieve the above object, the present invention proposes the following means. Claim 1
The invention according to the present invention is characterized in that, in a portable terminal device provided with a speaker, switching means for switching an area of a diaphragm of the speaker is provided.

According to the portable terminal device according to the present invention, the area of the diaphragm of the speaker is changed by the switching means, and the speaker can function as, for example, a hands-free speaker or a receiver according to the area of the diaphragm. Becomes

According to a second aspect of the present invention, in the portable terminal device according to the first aspect, when switched by the switching means, the area of the diaphragm of the speaker is set to an area as a hands-free speaker or a receiver. It is characterized by having been done. According to the invention according to the present invention, when the area of the diaphragm is switched by the switching means, the speaker functions as a hands-free speaker or a receiver.

According to a third aspect of the present invention, in the portable terminal device according to the second aspect, the loudspeaker is attached to a driving portion located on a reference axis so as to extend around the reference axis. The switching means is a diaphragm fixing / releasing mechanism for fixing the intermediate portion between the outer peripheral edge and the driving portion of the diaphragm at a fixed position around the reference axis, and for releasing the intermediate portion. There is a feature.

According to the portable terminal device of the present invention, when the diaphragm of the speaker is fixed by the diaphragm fixing / releasing mechanism, the speaker functions as a receiver, and when the fixing of the diaphragm is released. Functions as a hands-free speaker.

According to a fourth aspect of the present invention, in the portable terminal device according to the third aspect, a back-side fixing member is disposed on a back side of the diaphragm so as to surround the reference axis. A front fixing member surrounding the reference axis and moving in the reference axis direction to fix and release the vibration plate is disposed on the front side, and the front fixing member moves in the direction of the diaphragm. When this is fixed, the diaphragm is supported by a case by screwing means so as to form a listening space on the front side of the diaphragm.

According to the portable terminal device of the present invention, when the front fixing member is moved in the direction of the diaphragm and the diaphragm is fixed by the front fixing member and the rear fixing member, a listening space is formed on the front side of the case. It is formed. When the speaker is used as a receiver, the listening space acts to suppress the attenuation in the low frequency range among the sounds generated from the diaphragm.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The embodiment described here is a case where the present invention is applied to a mobile phone. 1 and 2, a mobile phone 1 (portable terminal device) includes a speaker 3 in a case 2 which also serves as a receiver and a hands-free speaker.

The case 2 is formed integrally with the front wall 4, the side wall 5, and the rear wall 6 as main walls. An opening 7 is formed in the front wall portion 4, a peripheral portion of the opening 7 is a thick mounting wall portion 8, and a female screw portion 9 is formed on an inner surface thereof.

The loudspeaker 3 has a substantially conical diaphragm 12 attached to a driving unit 11 positioned on the reference axis 10 so as to extend around the reference axis 10. An annular outer diameter edge portion 14 is formed on the outer peripheral edge 13, and an annular inner diameter edge portion 15 is formed at an intermediate portion between the outer peripheral edge 14 and the driving section 11 so as to be located around the reference axis 10. With this configuration, the diaphragm 12 is configured such that the outer diameter edge portion 14 and the inner diameter edge portion 15
A, and a portion between the inner diameter edge portion 15 and the drive portion 11 is an inner diameter vibration portion 12B. The speaker 3 has an outer diameter edge portion 14 fixed to the side wall portion 5 and the mounting wall portion 8 of the case 2, and the driving portion 11 is supported by a support member (not shown). In this case, the reference axis 10 is
Axis.

The rear wall 6 of the case 2 is provided with a rear fixing member 17 located behind the speaker 3. The rear fixing member 17 is formed in a cylindrical shape, and its axis is aligned with the reference axis 10, and is disposed such that its front end faces the inner diameter edge 15. A front fixing member 18 is provided in the opening 7. The front fixing member 18 has an end wall portion 20 formed on a cylindrical wall portion 19, a male screw portion 21 is formed on the outer peripheral surface of the cylindrical wall portion 19, and an opening 22 is formed on the end wall portion 20. Have been.

The front fixing member 18 is positioned so as to surround the reference axis 10 by being screwed to the female screw portion 9, and moves in the direction of the reference axis 10 by its rotation, and moves in the direction of the diaphragm 11. When moved, the back fixing member 1
7, the inner diameter edge portion 15 is fixed and held, whereby the vibration area of the diaphragm 12 can be changed. When the front fixing member 18 moves in the direction of the diaphragm 12, a listening space 23 is formed in the opening 7.

In the above configuration, the rear fixing member 17 and the front fixing member 18 constitute a diaphragm fixing / releasing mechanism 30 as switching means for switching the area of the diaphragm 12 of the speaker 3.

In the above portable telephone 1, the speaker 3
Is used as a hands-free speaker, the front fixing member 18 is positioned such that the surface of the end wall portion 20 matches the surface of the front wall portion 4 as shown in FIG. In this state, the speaker 3 functions as a hands-free speaker by releasing the inner diameter edge portion 15 of the diaphragm 12. That is, since the vibration area of the diaphragm 12 is ensured to be wide, when the signal at the level for driving the hands-free speaker is input, the diaphragm 1
2, functions as a hands-free speaker by generating a sufficient sound pressure by the inner diameter vibrating portion 12B and the outer diameter vibrating portion 12A, suppressing generation of distortion and the like.

In order to make the speaker 3 function as a receiver, the front fixing member 18 is rotated from the above state, and the front fixing member 18 is moved in the direction of the diaphragm 12 as shown in FIG. Fixing member 18 and back fixing member 1
7 fixes the inner diameter edge portion 15. With this configuration, the vibrating plate 12 has only the vibrable portion of the inner diameter vibrating portion 12B, and the vibration area is small. Therefore, even when a signal at the level for driving the receiver is input, it functions sufficiently as a receiver because the vibration area is small.

In this case, a listening space 23 is formed in the opening 7 of the case 2 by moving the front fixing member 18 toward the diaphragm 12. Therefore, when the case 2 of the mobile phone 1 is brought into contact with the ear at the opening 7, there is a listening space 23 between the ear and the speaker 3.
Among the sound ranges emitted from the diaphragm 12, the attenuation of particularly the low sound range is suppressed, and the compensation effect of the low sound range is obtained.

As described above, in the above-mentioned portable telephone 1, since the speaker 3 is configured to be used both as a hands-free speaker and a receiver, a single audio output circuit can be provided, and the board space can be reduced. Power consumption can be reduced. Further, since the speaker 3 can be driven in a reasonable manner, it is possible to listen to the audio signal while suppressing generation of white noise and distortion. Further, the diaphragm 12
Is switched by the front fixing member 18,
The operation can be easily performed.

Although the above embodiment is an example in which the present invention is applied to a mobile phone, the present invention is not limited to a mobile phone, but can be applied to various other mobile terminal devices. .

[0025]

As described above, according to the first aspect of the present invention, the area of the diaphragm of the loudspeaker is switched in the portable terminal device having the hands-free voice listening function and the receiver voice listening function. With such a configuration, the speaker can be switched between the hands-free speaker and the receiver.

According to the second aspect of the present invention, since the speaker has the functions of a hands-free speaker and a receiver, the number of output circuits can be reduced and power consumption can be reduced. Further, since the speaker is driven in a reasonable manner by changing the area of the diaphragm, the effect of suppressing the generation of white noise and distortion can be obtained.

According to the third aspect of the present invention, since the area of the diaphragm of the speaker is changed by the diaphragm fixing / releasing mechanism, the switching operation between the hands-free speaker and the receiver can be easily performed. It can be carried out.

According to the fourth aspect of the present invention, when the front fixing member is moved in the direction of the diaphragm to fix the diaphragm, a listening space is formed on the front side of the case.
Among the sounds generated from the diaphragm, an effect of suppressing attenuation particularly in a low-frequency range is obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a portable terminal device according to an embodiment of the present invention, showing a case where a speaker is used as a hands-free speaker.

FIG. 2 is a longitudinal sectional view of a main part of the portable terminal device according to one embodiment of the present invention, showing a case where a speaker is used as a receiver.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 mobile terminal device 3 speaker 10 reference axis 11 driving unit 12 diaphragm 13 outer peripheral edge 17 back fixing member 18 front fixing member 23 listening space 30 switching means (diaphragm fixing / release mechanism)

Claims (4)

[Claims] 1. A portable terminal device provided with a speaker, comprising: a switching unit that switches an area of a diaphragm of the speaker. 2. The mobile terminal device according to claim 1, wherein
The portable terminal device, wherein when switched by the switching means, an area of the diaphragm of the speaker is set to an area as a hands-free speaker or a receiver. 3. The portable terminal device according to claim 2, wherein the speaker is configured such that the diaphragm is attached to a drive unit positioned on a reference axis so as to extend around the reference axis. The switching means fixes the intermediate portion between the outer peripheral edge and the driving portion of the diaphragm at a fixed position around the reference axis, and also releases and releases the diaphragm.
A portable terminal device, which is a release mechanism. 4. The portable terminal device according to claim 3, wherein a rear side fixing member is disposed on a rear side of the diaphragm so as to surround the reference axis, and the reference side is disposed on a front side of the diaphragm. A front fixing member surrounding the axis and moving in the reference axis direction to fix and release the vibrating plate is provided, and the front fixing member moves in the direction of the diaphragm and fixes it. A portable terminal device supported by a case by screwing means so as to form a listening space on the front side of the diaphragm.