JPH07131375A - Terminal equipment for mobile communication - Google Patents

Abstract

PURPOSE:To reduce acoustic wave attenuation even in the case of waterproof structure by providing a loop-shaped projecting part inside a cabinet for housing acoustic equipments such as a transmitter/receiver and a buzzer so as to surround a small hole and providing thin porous water-proof paper for protecting the parts from water drops invaded from the small hole. CONSTITUTION:When fitting acoustic parts 4 inside a cabinet 1, a small hole 2 for acoustic is opened at the cabinet 1 corresponding to the size of the parts 4, an internal loop-shaped projecting part 3 is formed at the cabinet 1 so as to surround this small hole, only the periphery of water-proof paper 5 is fixed on this surface, and this paper is fastened by a loop-shaped interposing object 6 such as a rubber. Thus, front air chambers 8 and 7 are generated with the water-proof paper 5 between them between the small hole 2 and the parts 4, the water drops entering the front air chamber 8 can be easily discharged by lightly shaking the cabinet 1, and the acoustic wave attenuation caused by the water-proof paper 5 is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication terminal having a waterproof structure. Mobile communication terminals such as mobile phones are often used outdoors.
Therefore, since it is used even in rainy weather, it is necessary to have a waterproof structure in order to protect the internal electronic circuits and the like. Therefore, the operation buttons and the like have a waterproof structure made of rubber or the like, and the transmitter, the receiver, and the buzzer have a waterproof structure made of waterproof paper that allows air to pass but does not allow water to pass. In this waterproof structure using waterproof paper, it is desired to reduce the influence on the acoustic characteristics.

[0002]

2. Description of the Related Art FIG. 10 is a cross-sectional view of a main part of a conventional example and shows a receiver portion of a mobile communication terminal such as a mobile phone. In the figure, 71 is a housing made of synthetic resin, 72 is a small hole having a circular, elliptical or rectangular shape, 73 is an internal annular projection, 74
Is a receiver, 75 is waterproof paper, and 76 is an anterior chamber. The handset 74 has a disk shape and corresponds to a small speaker,
Various configurations such as an electromagnetic type and a piezoelectric type are known as an electro-acoustic conversion mechanism.

The handset 74 is attached to the inner annular projection 73, and waterproof paper 75 is adhered so as to close the small hole 72, and a front air chamber 76 is formed between the handset 74 and the housing 71.
The sound waves converted by the handset 74 are emitted from the small holes 72 through the waterproof paper 75. Further, in the housing 71, a wireless transmission / reception unit, a voice signal processing unit, a control unit, a transmitter, etc. are provided. In addition, dial keys and various operation keys are provided,
It is waterproofed by rubber sheets.

The waterproof paper 75 is, for example, polyethylene or 4
Breathlon, Microtex (trademark) and the like are known, which are made of fluorinated ethylene and the like which are made porous so that air can pass through but water cannot pass through. Further, in the case of waterproof paper obtained by making tetrafluoroethylene porous, there are those having characteristics such as a thickness of 15 to 300 μm, a porosity of 40 to 90%, and a diameter of each hole of 0.1 to 4.0 μm. By blocking the small holes 72 with such waterproof paper 75, it is possible to prevent water droplets from entering through the small holes 72.

Further, inside the casing 71, a transmitter corresponding to a microphone (not shown), a buzzer for displaying an incoming call, and the like are provided, and the casing at a position corresponding to the transmitter and the buzzer is provided. Small holes are formed in 71, and waterproof paper is also adhered to these small holes in the same manner as described above to prevent water droplets from entering.

[0006]

In the conventional mobile communication terminal, a small hole 72 is formed in the housing 71 at a position facing the receiver 74, transmitter, buzzer, etc. Hole 7
The waterproof paper 75 is directly attached to the housing 71 so as to block the 2 to obtain a waterproof effect. In this case, waterproof paper 75
Is adhered to the casing 71 except for the portion facing the small hole 72, and even if the waterproof paper 75 is extremely thin and has a thickness of about several tens of μm and is porous, the portion of the small hole 72 is Since it cannot vibrate, the sound wave will pass through the porous holes, and the attenuation will be relatively large. For example, the sound pressure level of the transmitter decreases by about 6 to 10 dB as a whole,
In the frequency region of 4 kHz or more, it was reduced by 20 dB or more. Similarly, with respect to the handset, the sound pressure level was reduced by about 6 to 8 dB by providing the waterproof paper.

Therefore, in order to set the sound pressure from the small holes 72 to a desired level, a receiver 74 is provided which can generate an excessive sound pressure by the amount attenuated by the waterproof paper 75, and the receiver 74 is driven. Therefore, it is necessary to amplify the electric signal.
Also in the transmitter, since the output signal level of the transmitter is lowered by the amount attenuated by the waterproof paper, extra amplification is required. Therefore, there is a drawback that the amplified power becomes large and the continuous usable time of the mobile communication terminal using the battery power source becomes short. It is an object of the present invention to reduce sound wave attenuation caused by waterproof paper.

[0008]

A mobile communication terminal according to the present invention will be described with reference to FIG. 1. (1) An inner ring formed so as to surround an acoustic small hole 2 of a housing 1. Protrusion 3
To the acoustic component 4 such as handset, transmitter, buzzer,
In a mobile communication terminal in which a front air chamber is formed between the housing 1 around the small hole 2 and the acoustic component 4, the waterproof paper 5 is placed between the small hole 2 and the acoustic component 4. , Only the peripheral portion of the waterproof paper 5 is fixed, and between the waterproof paper 5 and the casing 1 and between the waterproof paper 5
An anterior air chamber was formed between and the acoustic component 4.

(2) An annular inclusion 6 is fixed to the acoustic component 4, and a peripheral portion of the waterproof paper 5 is fixed between the annular interposition part 6 and the inner annular projection 3 to fix the acoustic component 4 and the waterproof paper. Front air chambers 7 and 8 can be formed between the waterproof paper 5 and the housing 1, respectively.

(3) The housing 1 around the small hole 2 for sound
Is bent outward, the peripheral portion of the waterproof paper 5 is fixed to the housing 1, the acoustic component 4 is mounted on the inner annular protrusion 3, and the space between the acoustic component 4 and the waterproof paper 5 and between the waterproof paper 5 and the casing. An anterior air chamber can be formed between the curved portion of the body 1 and the curved portion.

(4) The outer peripheral portion of the acoustic small hole 2 of the housing 1 is made smooth and the inner portion is made uneven, and the peripheral portion of the waterproof paper 5 is fixed to the smooth surface, and the inner annular projection 3 is formed. The acoustic component 4 can be attached to the.

(5) The opposing surfaces of the inner annular projection 3 and the annular inclusions 6 are inclined inward, the central portion of the waterproof paper 5 is loosened, and the peripheral portion of the waterproof paper 5 is defined as the inner annular projection 3. It can be fixed to the annular inclusion 6.

(6) The opposing surfaces of the inner annular protrusion 3 and the annular inclusion 6 are inclined in one direction so that the peripheral portion of the waterproof paper 5 is located between the inner annular protrusion 3 and the annular inclusion 6. The small hole 2 for sound can be formed in close proximity to the side where the height of the inner annular protrusion 3 is low.

[0014]

(1) Only the peripheral portion of the waterproof paper 5 is fixed, and the front air chambers are formed between the waterproof paper 5 and the housing 1 and between the acoustic component 4, respectively. It is possible to vibrate over a wider range than the area of the small holes 2. Therefore, when the acoustic component 4 is, for example, a receiver, the waterproof paper 5 is vibrated by the sound pressure of the diaphragm of the receiver and sent out from the small hole 2 to the outside of the housing 1. Due to the vibration of the waterproof paper 5, the attenuation of the sound pressure from the handset becomes very small.

(2) Since the peripheral portion of the waterproof paper 5 is fixed between the inner annular projection 3 and the annular inclusion 6 and front air chambers are formed in front of and behind the waterproof paper 5, the waterproof paper 5 becomes the acoustic component 5. It is possible to vibrate the part corresponding to the front surface of the. Therefore, when the acoustic component 4 is, for example, a receiver, the waterproof paper 5 is vibrated by the sound pressure of the diaphragm of the receiver, and the waterproof paper 5 and the housing 1
Sound waves are radiated from the small holes 2 via the anterior air chamber between and.

(3) The front air chamber is formed between the waterproof paper 5 and the housing 1 by bending the housing 1 outward and fixing the peripheral portion of the waterproof paper 5 inside the housing 1. By mounting the acoustic component 4 on the inner annular protrusion 3, a front air chamber is formed between the waterproof paper 5 and the acoustic component 4. The waterproof paper 5 has a structure that can vibrate over a wide range due to the small holes 2. Therefore, the sound wave attenuation by the waterproof paper 5 can be reduced.

(4) The peripheral portion of the waterproof paper 5 is secured to the smooth surface of the housing to ensure the waterproof effect, and the space between the uneven surface and the waterproof paper 5 corresponds to a small front air chamber, which is waterproof. The paper 5 has a structure capable of vibrating over a wider range than the small hole 2. Therefore, the sound wave attenuation by the waterproof paper 5 can be reduced.

(5) The opposing surfaces of the inner annular projection 3 and the annular interposition portion 6 are inclined inwardly and fixed so that the waterproof paper 5 is sandwiched between the waterproof paper 5 and the waterproof paper 5. Loosen the central part. As a result, the waterproof paper 5 is configured to be vibrable, and the attenuation of sound waves can be reduced as described above. Further, when water droplets enter from the small hole 2 between the housing 1 and the waterproof paper 5, the waterproof paper 5 vibrates by giving a light impact, so that the water pressure is removed from the small hole 2 by its wind pressure. You can

(6) Since the waterproof paper 5 is provided so as to be inclined with respect to the housing 1 and the peripheral portion of the waterproof paper 5 is fixed, the waterproof paper 5 can vibrate over a wide range due to the small holes 2. It will be composed. Therefore, as described above, the sound wave attenuation can be reduced. Further, since the small hole 2 is formed on the side where the height of the inner annular projection 3 is low, by shaking the casing 1, water droplets are transmitted along the inclined surface of the waterproof paper 5, and centrifugal force or the like is applied. After the water droplet moves to the small hole 2 side, the small hole 2
Will be discharged from.

[0020]

FIG. 2 is an exploded perspective view of an essential part of a first embodiment of the present invention, in which 11 is a housing made of synthetic resin, 12 is a small hole for sound, and 13 is integrally formed with the housing 11. The formed inner annular protrusion, 14 is a receiver as an acoustic component, 15 is a waterproof paper, 1
6 is an annular inclusion. The annular inclusion 16 can be formed of an elastic body such as rubber or a synthetic resin. It can also be a metal. Further, the step portion 1 is provided inside the annular inclusion 16.
6a may be formed, and the handset 14 may be fitted into the step portion 16a. The waterproof paper 15 has a thickness of about several tens of μm, and has a diameter of about several mm when the small holes 12 are circular. The height of the inner annular protrusion 13 is several mm.

The peripheral portion of the waterproof paper 15 is fixed on the inner annular projection 13 with an adhesive or the like, the annular inclusion 16 is placed on the inner peripheral protruding portion 13, and the peripheral portion of the waterproof paper 15 is fixed by the adhesive or the like. The disc-shaped handset 14 is fitted and attached to the step portion 16a of the annular inclusion 16. Therefore, a front air chamber surrounded by the inner annular protrusion 13 is formed between the waterproof paper 15 and the housing 11, and the annular inclusion 1 is provided between the waterproof paper 15 and the handset 14.
An anterior chamber surrounded by 6 is formed. Assuming that the front air chamber in the handset 14 is the first front air chamber, the waterproof paper 15 and the handset 1
A second front air chamber is formed between the waterproof paper 15 and the casing, and a third front air chamber is formed between the waterproof paper 15 and the housing. The small hole 12 is
It can have various shapes such as a single circle, ellipse, and rectangle. Also, a plurality of any of them or a combination thereof may be used.

Since the handset 14 has a waterproof structure with the waterproof paper 15, even if water droplets enter from the small hole 12,
The handset 14 can be protected. Furthermore, waterproof paper 15
Is fixed only between the inner annular projection 13 and the annular inclusion 16 and its peripheral portion, and thus can vibrate over a wider range than the small hole 12. Therefore, the sound pressure generated by the diaphragm of the handset 14 propagates through the air in the front air chamber between the handset 14 and the waterproof paper 15 and vibrates the waterproof paper 15. In addition, a part of the waterproof paper 15 and the housing 11 are made through porous holes.
To the second anterior chamber between and. The sound pressure generated by the vibration of the waterproof paper 15 or the sound pressure through the holes of the waterproof paper 15 is
From the third front air chamber between the housing 11 and the waterproof paper 15 to the small hole 1
It is radiated to the outside via 2. Therefore, the attenuation due to the waterproof paper 15 can be reduced.

Similarly, when a transmitter or a buzzer is provided as an acoustic component, waterproof paper is also provided. In the case of the transmitter, external sound waves are transmitted through the small holes 12 of the housing 11. However, since the waterproof paper can vibrate over a wider range than the small hole 12 at that time, sound waves are input to the transmitter with slight attenuation, and The output signal level can be slightly lowered as compared with the case where the waterproof paper is not provided. As a result, the amplification power consumption can be reduced.

FIG. 3 is a sectional view of the essential parts of the second embodiment of the present invention, in which 21 is a housing, 22 is a small hole, 23 is an internal annular projection, 24 is a receiver as an acoustic component, and 24a is a receiver. Two
Reference numeral 24b is a diaphragm, 24c is an electromagnetic or piezoelectric drive unit, 25 is waterproof paper, 27 and 28 are second and third front chambers, and 29 is a curved portion.

In this embodiment, the housing 2 around the small hole 22 is provided.
1 is bent outward to form a curved portion 29, and the waterproof paper 25
The peripheral portion is fixed to the inside of the housing 21 to provide a waterproof structure, and the receiver 24 is attached to the inner annular protrusion 23. Therefore, a second front air chamber 27 surrounded by the inner annular projection 23 is formed between the waterproof paper 25 and the handset 24, and a space formed by the curved portion 29 is provided between the waterproof paper 25 and the housing 21. By this, a third front air chamber 28 is formed, and the waterproof paper 25 has a configuration capable of vibrating over a wider range than the small hole 22.
As a result, the diaphragm 24b of the handset 24 is driven by the drive unit 24c, and the sound pressure by the diaphragm 24b is propagated from the first front air chamber 24a to the second front air chamber 27, and the second front air chamber 27 is transmitted. The waterproof paper 25 vibrates due to the sound pressure of 27, and a sound wave can be propagated to the third front air chamber 28, and the sound wave is radiated to the outside from the third front air chamber 28 through the small hole 22. Since the waterproof paper 25 vibrates over a wider range than the small holes 22, it is possible to reduce the attenuation and propagate the sound waves.

FIG. 4 is a sectional view of the essential parts of the third embodiment of the present invention, in which 31 is a housing, 32 is a small hole, 33 is an inner annular projection, 34 is a receiver as an acoustic component, and 35 is waterproof. Paper, 3
Reference numeral 7 is a second front air chamber, and 38 is an equivalent third front air chamber.

In this embodiment, the outer side of the peripheral portion of the small hole 32 of the housing 31 is a smooth surface and the inner side is an uneven surface, and the peripheral portion of the waterproof paper 35 is fixed to the smooth surface. That is, as shown in the lower right side by enlarging the portion A, the outer casing 31 is a smooth surface 31a with respect to the small hole 32, and the inner surface is an uneven surface 31b, and the smooth surface 31a has a waterproof paper 35. Are fixed with an adhesive or the like.

A receiver 34 is attached to the inner annular protrusion 33. Therefore, a second line is placed between the handset 34 and the waterproof paper 35.
A front air chamber 37 is formed. In addition, the uneven surface 31b and the waterproof paper 3
A small space is formed between the third front air chamber 38 and
Is equivalent to. In this case, the waterproof paper 3 has a thickness of about several tens of μm, and the uneven surface 31b has unevenness of several tens of μm.
It is possible to employ various patterns of approximately several hundred μm and random or concentric circles. In this way, the waterproof paper 3
5 is fixed to the smooth surface 31a only in its peripheral portion and can vibrate on the uneven surface 31b, so that it can vibrate over a wider range than the small hole 32. Therefore, the sound wave can be propagated by reducing the attenuation caused by the waterproof paper 35.

FIG. 5 is a cross-sectional view of the essential parts of the fourth embodiment of the present invention, in which 41 is a housing, 42 is a small hole, 43 is an inner annular projection, 44 is a receiver as an acoustic component, and 45 is waterproof. Paper, 4
Reference numeral 6 is an annular inclusion, and 47 and 48 are second and third front air chambers.

The inner annular projection 43 and the annular inclusion 46 are arranged so that the facing surfaces thereof are inclined inward, and the peripheral portion of the dish-shaped waterproof paper 45 is fixed between the facing surfaces, and the central portion of the waterproof paper 45 is secured. To have slack. Also in this embodiment, the waterproof paper 45
A second front air chamber 47 is formed between the receiver and the receiver 44, and a third front air chamber 48 is formed between the waterproof paper 45 and the housing 41. The waterproof paper 45 has a structure capable of vibrating over a wider area than the small hole 42, and attenuation of the waterproof paper 45 can be reduced to propagate sound waves.

When the mobile communication terminal is used outdoors during rainfall, water droplets may enter the third front air chamber 48 through the small holes 42. In that case, shake the housing 41 or use the small hole 4
When the casing 41 on the opposite side is tapped with 2 facing downward, the waterproof paper 45 largely fluctuates between the dotted line and the solid line due to the slack in the central portion. The water droplets that have entered due to the wind pressure caused by the movement of the waterproof paper 45 are discharged to the outside through the small holes 42. That is, even if water droplets enter the third front air chamber 48, the telephone receiver 44 can be protected by the waterproof paper 45 and can be easily discharged to the outside.

FIG. 6 is a sectional view of the essential parts of the fifth embodiment of the present invention, in which 51 is a housing, 52 is a small hole, 53 is an internal annular projection, 54 is a receiver as an acoustic component, and 55 is waterproof. Paper, 5
Reference numeral 6 is an annular inclusion, and reference numerals 57 and 58 are second and third front air chambers.

In this embodiment, the opposing surfaces of the inner annular protrusion 53 and the annular inclusion 56 are tilted in one direction, and the peripheral portion of the waterproof paper 55 is fixed to the opposing surface to increase the height of the inner annular protrusion 3. The small hole 52 is formed in the vicinity of the lower side. Also in this embodiment, the second front air chamber 57 is formed between the waterproof paper 55 and the handset 54, and the third front air chamber 57 is formed between the waterproof paper 55 and the housing 51.
Since the front air chamber 58 is formed, the waterproof paper 55 has a small hole 52.
The structure is capable of vibrating over a wider range. Therefore,
The sound wave can be propagated by reducing the attenuation by the waterproof paper 55.

FIG. 7 is a partially cutaway side view of the fifth embodiment of the present invention, in which the same reference numerals as those in FIG. 6 denote the same parts, 60 is a mobile communication terminal, 61 is an antenna, and 62 is a transmitter. Phone, 6
Reference numeral 3 is a buzzer, and 64 is an operation key such as a dial key or a function key. The mobile communication terminal 60 is a mobile phone that is capable of performing normal telephone calls and includes a configuration that enables transmission and reception of various data.

The antenna 61 portion and the operation key 64 portion have a waterproof structure such as rubber packing. Also, the transmitter 62 and the buzzer 63 are waterproofed by waterproof paper so that water droplets do not enter the transmitter 62 and the buzzer 63 from the small holes for acoustics by applying any of the above-described embodiments. ing. Since the waterproof paper is configured to be capable of vibrating over a wider range than each small hole, the attenuation of sound waves by the waterproof paper can be reduced.

The water droplets that have entered the third front air chamber 58 through the small holes 52 are shaken by the casing 51 as shown by arrow B, and are caused by the centrifugal force and the inclination of the waterproof paper 55, thereby forming the small holes. 5
After moving to the 2 side, the small holes 52 are discharged to the outside. Alternatively, by turning the housing 51 upside down, the water droplets move to the small hole 52 side along the waterproof paper 55 and along the inner surface of the housing 51, and are shaken lightly to discharge the water droplets from the small holes 52. can do.

FIG. 8 is a frequency characteristic curve diagram of the handset according to the embodiment of the present invention, showing the output level [dB] at a frequency of 100 Hz to 10 kHz, and (a) shows the frequency characteristic of the structure without the waterproof paper. And (b) shows the frequency characteristics of the structure provided with the waterproof paper of the above-mentioned embodiment of the present invention. Further, (c) shows a frequency characteristic when the waterproof paper is loosened as in the embodiment of FIG. Further, (d) shows the frequency characteristic of the structure in which the conventional waterproof paper as shown in FIG. 10 is provided. As can be seen from these frequency characteristic curves, according to the embodiments of the present invention, the level drop due to the provision of the waterproof paper is only a few dB.

FIG. 9 is a frequency characteristic curve diagram of the transmitter according to the embodiment of the present invention, showing the output level [dB] at a frequency of 100 Hz to 10 kHz, and FIG. 9A shows a structure without waterproof paper. 4B shows frequency characteristics, and FIG. 3B shows frequency characteristics of the structure provided with the waterproof paper of the above-described embodiment of the present invention. Further, (C) shows the frequency characteristic of the structure in which the conventional waterproof paper as shown in FIG. 10 is provided. Also in this transmitter, the level drop is as small as several dB.

[0039]

As described above, according to the present invention, the acoustic component 4 such as the handset, the transmitter, and the buzzer is attached to the small hole 2 of the housing 1.
It is attached to the inner annular projection 3 formed so as to enclose the above, and is provided with a thin and porous waterproof paper 5 that protects the acoustic component 4 from water droplets and the like that have entered from the small holes 2. At that time, In order to vibrate the waterproof paper 5 over a wider area than the small hole 2, only the peripheral portion of the waterproof paper 5 is fixed, and the front air chamber 8 is formed between the waterproof paper 5 and the housing 1. It is possible to reduce the sound wave attenuation by the waterproof paper 5. As a result, the amplification power for obtaining a desired sound pressure or a desired signal level can be reduced, and a small acoustic component 4 can be used, so that the mobile communication terminal can be downsized and used. There is an advantage that the time can be extended.

Further, the peripheral portion of the waterproof paper 5 is fixed between the inner annular protrusion 3 and the annular inclusion 6, and the acoustic component 4 is attached to the annular inclusion 6.
The second front air chamber 7 between the waterproof paper 5 and the acoustic component 4 and the third front air chamber 8 between the waterproof paper 5 and the housing 1 are connected to the annular inclusion 6 and By selecting the height of the inner annular projection 3, the desired size can be obtained in consideration of acoustic characteristics and the like. Further, since the waterproof paper 5 can be configured to be able to vibrate over a wider area than the small hole 2, there is an advantage that the attenuation of sound waves by the waterproof paper 5 can be reduced. Ring inclusion 6
Can be formed integrally with the case of the acoustic component 4 in advance, and in that case, the assembly becomes easy.

By bending the casing 1 around the small hole 2 to the outside and fixing the peripheral portion of the waterproof paper 5 to the inside of the casing 1, a space between the waterproof paper 5 and the casing 1 can be obtained. There is an advantage that the third front air chamber 8 is formed and the waterproof paper 5 can be vibrated over a wider range than the small hole 2 so that the attenuation by the waterproof paper 5 can be reduced. Further, since only a part of the housing 1 is swollen, the third front portion is provided between the waterproof paper 5 and the housing 1 without enlarging the housing 1 and without using an annular inclusion. The air chamber 8 can be formed.

On the inner surface of the casing 1 around the small hole 2, the outer surface of the peripheral portion of the small hole 2 is a smooth surface, and the inner side is an uneven surface, and the peripheral portion of the waterproof paper 5 is a smooth surface. Since it adheres to the third surface, the minute space between the uneven surface and the waterproof paper 5 is
Since it can be used as the front air chamber 8 of the
It is possible to vibrate over a wider range and there is an advantage that the attenuation of sound waves by the waterproof paper 5 can be reduced. Further, since the smooth surface and the uneven surface can be formed at the same time when the housing 1 is formed by injection molding or the like, there is no particular cost increase, and the housing 1 is not enlarged. The third front air chamber 8 can be formed without using an annular inclusion.

Further, the opposing surface of the inner annular projection 3 and the annular inclusion 6 is inclined inward, and the peripheral portion of the waterproof paper 5 is fixed so as to be sandwiched between the opposing surfaces to form the waterproof paper 5 into a dish shape, and By slackening the central portion, the waterproof paper 5 has a configuration capable of vibrating over a wider range than the small hole 2, and has an advantage that the attenuation of sound waves by the waterproof paper 5 can be reduced. Further, water droplets that have entered the third front air chamber 8 between the waterproof paper 5 and the housing 1 through the small holes 2 are caused to vibrate the housing 1 to vibrate the waterproof paper 5, and the waterproof paper 5 Small hole 2 due to wind pressure due to vibration of
Can be discharged from.

Further, the opposing surfaces of the inner annular projection 3 and the annular inclusion 6 are inclined in one direction, and the peripheral portion of the waterproof paper 5 is fixed so as to be sandwiched between the opposing surfaces, so that the height of the inner annular projection 3 is increased. By forming the small hole 2 close to the lower side, the waterproof paper 5
Has an advantage that it can vibrate over a wide range due to the small hole 2, and has the advantage of reducing the attenuation of sound waves by the waterproof paper 5, and further has a third front part between the small hole 2 and the waterproof paper 5 and the housing 1. The water droplets that have entered the air chamber 8 can be easily discharged from the small hole 2 by gently shaking the casing 1 or by turning it upside down.

The present invention is not limited to the above-described embodiments, but various additions and modifications can be made.
For example, the peripheral part of the waterproof paper 5 is sandwiched and fixed between the inner annular projection 3 and the annular inclusion 6, and the acoustic component 4 is attached to the annular inclusion 6.
It is also possible to assemble the configuration in which the internal ring-shaped protrusion 3 is fixed to the housing 1 in the vicinity of the small hole 2 with an adhesive or the like.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is an exploded perspective view of a main part of the first embodiment of the present invention.

FIG. 3 is a cross-sectional view of essential parts of a second embodiment of the present invention.

FIG. 4 is a cross-sectional view of an essential part of a third embodiment of the present invention.

FIG. 5 is a cross-sectional view of an essential part of a fourth embodiment of the present invention.

FIG. 6 is a cross-sectional view of essential parts of a fifth embodiment of the present invention.

FIG. 7 is a partially cutaway side view of a fifth embodiment of the present invention.

FIG. 8 is a frequency characteristic curve diagram of the handset according to the embodiment of the present invention.

FIG. 9 is a frequency characteristic curve diagram of the transmitter according to the embodiment of the present invention.

FIG. 10 is a sectional view of a main part of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 Small hole 3 Internal annular protrusion 4 Acoustic component 5 Waterproof paper 6 Annular inclusion 7 Second front air chamber 8 Third front air chamber

Claims (6)

[Claims] 1. An acoustic component (4) is mounted on an inner annular protrusion (3) formed so as to surround a sound hole (2) of a housing (1), and the sound hole (2) is attached to the hole (2). In a mobile communication terminal in which a front air chamber is formed between the housing (1) and the acoustic component (4) in the peripheral portion, the small hole (2) and the acoustic component (4) are provided. A waterproof paper (5) is disposed between the waterproof paper (5) and only the peripheral portion of the waterproof paper (5) is fixed, and between the waterproof paper (5) and the housing (1) and the waterproof paper (5). A mobile communication terminal, wherein a front air chamber is formed between the acoustic component (4). 2. An annular inclusion (6) on the acoustic component (4).
And the peripheral part of the waterproof paper (5) is fixed between the annular inclusion (6) and the internal annular protrusion (3), and the acoustic component (4) and the waterproof paper (5) are fixed. The mobile communication terminal according to claim 1, wherein a front air chamber is formed between the waterproof paper (5) and the housing (1). 3. The housing (1) in the peripheral portion of the acoustic small hole (2) is bent outward, and the peripheral portion of the waterproof paper (5) is fixed to the housing (1), The inner annular protrusion (3)
The acoustic component (4) is attached to the front of the acoustic component (4) and the waterproof paper (5) and between the waterproof paper (5) and the curved portion of the housing (1). The mobile communication terminal according to claim 1, wherein an air chamber is formed. 4. The soundproof small hole (2) of the housing (1) has a smooth surface on the outer side and an uneven surface on the inner side, and the peripheral part of the waterproof paper (5) is the smooth surface. 2. The mobile communication terminal according to claim 1, wherein the acoustic component (4) is fixed and the acoustic component (4) is mounted on the inner annular protrusion (3). 5. The waterproof paper (5) is formed by inclining the facing surfaces of the inner annular protrusion (3) and the annular inclusion (6) inwardly and slackening the central portion of the waterproof paper (5). The mobile communication terminal according to claim 1, wherein a peripheral portion of the terminal is fixed between the inner annular protrusion (3) and the annular inclusion (6). 6. The inner annular protrusion (3) and the annular inclusion (6) are formed by inclining the facing surfaces of the inner annular protrusion (3) and the annular inclusion (6) in one direction. A peripheral portion of the waterproof paper (5) is fixed between the two, and the small hole (2) for sound is formed close to the side where the height of the inner annular protrusion (3) is low. The mobile communication terminal according to claim 1.