JP2011155346A - Acoustic structure and mobile terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an acoustic structure that is applicable to a mobile terminal or the like having waterproof performance and achieves the size reduction without reducing the sound volume to be output to the outside, and a mobile terminal including the acoustic structure. <P>SOLUTION: The acoustic structure 100 includes a casing 2 formed with each sound-emitting hole 242, a plurality of sound-generating elements 110 arranged inside the casing 2, a plurality of ducts 120 respectively formed with a first opening 121 opened on one-end side toward the sound-generating element 110 and a second opening 122 opened on the other-end side toward the sound-emitting holes 242, a cover member 130 arranged between the second opening 122 and the sound-emitting holes 242 and having a wave-receiving surface 131 located on the side of the ducts 120 and a wave-transmitting surface 132 located on the side of the sound-emitting holes 242, and a first cavity 140 formed between the second opening 122 and the cover member 130. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an acoustic structure applied to a portable terminal having waterproof performance, and a portable terminal including the acoustic structure.

Conventionally, there are known crime prevention buzzers that are mainly carried by children and women and generate a loud sound by sounding a sounding element when a danger is detected, and call attention to people around them. There has also been proposed a mobile phone equipped with the above.
In recent years, portable terminals such as portable telephones having waterproof performance have been proposed (see, for example, Patent Document 1). In the portable terminal having such a waterproof performance, the sound output portion such as a speaker is covered with a cover member that is waterproof and can be vibrated by sound output from the sound output portion, thereby ensuring the waterproof property. .

JP 2009-303279 A

  By the way, the crime prevention buzzer needs to generate a large volume in order to call attention to surrounding people. Therefore, when a portable terminal having waterproof performance is provided with a security buzzer function, it is necessary to use a large sounding element in order to vibrate the cover member and output a large volume to the outside. However, when a large sound generating element is used, the acoustic structure becomes large, and the mounting position of the sound generating element when the acoustic structure is applied to a mobile terminal is limited. Moreover, a portable terminal will enlarge.

  Therefore, the present invention is applicable to a portable terminal having waterproof performance, and provides an acoustic structure that can be reduced in size without reducing the volume of sound output to the outside, and a portable terminal equipped with the acoustic structure. Objective.

  The present invention includes a housing in which a sound emitting hole is formed, a plurality of sound generating elements that are arranged inside the housing and output sound, and a first opening that opens toward the sound generating element on one end side. A second opening that opens toward the sound emission hole is formed on the other end side, and a plurality of duct portions that guide sound output from each of the plurality of sound emitting elements to the sound emission hole side, A cover member disposed between the second opening in the duct portion and the sound emission hole and having a wave receiving surface located on the duct portion side and a wave transmission surface located on the sound emission hole side; The present invention relates to an acoustic structure including a first cavity formed between a second opening and the cover member.

  Moreover, it is preferable that the second opening of each of the plurality of ducts is disposed so as to face a substantially central portion of the cover member.

  The second opening of each of the plurality of ducts is preferably formed on the same plane, and the plane on which the second opening is formed is preferably arranged substantially parallel to the wave receiving surface.

  The housing includes an internal housing disposed on the wave receiving surface side of the cover member, and an external housing disposed on the wave transmitting surface side of the cover member and formed with the sound emitting hole. The cover member includes: a first adhesive member that bonds the vicinity of the wave receiving surface of the cover member and the inner housing; and the vicinity of the wave transmitting surface of the cover member and the outer housing. And a second adhesive member for adhering to each other.

  In addition, the length of the first adhesive member in the direction along the thickness direction of the casing is preferably configured to be thicker than the length of the second adhesive member in the direction along the thickness direction of the casing. .

  Further, the present invention provides a plurality of sound generating elements that generate sound waves, a cover member that receives and vibrates sound waves generated from each of the plurality of sound generating elements, and a sound wave generated from each of the plurality of sound generating elements. The present invention relates to an acoustic structure including a plurality of duct portions guided to the cover member side, and a first cavity portion formed between the cover member and the plurality of duct portions.

  The cover member is preferably made of a thin film resin or a microporous membrane member.

  The present invention also relates to a mobile terminal including any of the acoustic structures described above.

  ADVANTAGE OF THE INVENTION According to this invention, it can apply to the portable terminal etc. which have waterproof performance, and can provide the acoustic structure which can be reduced in size without reducing the volume output outside, and a portable terminal provided with this acoustic structure.

It is the figure which looked at the mobile telephone which concerns on one Embodiment of the portable terminal which comprises the acoustic structure of this invention from the front side. It is the figure which looked at the mobile telephone shown in FIG. 1 from the back surface side. It is a disassembled perspective view of the housing | casing which comprises the mobile telephone shown in FIG. 1, and is a figure which shows the state which looked at the housing | casing from the back side. It is the figure which looked at the mobile telephone from the back side, and is a figure which shows the state which removed the battery cover and the rear panel. FIG. 3 is a sectional view taken along line XX in FIG. 2. FIG. 6 is a partially enlarged view of FIG. 5, which is a cross-sectional view illustrating a state where a cover member is fixed to a housing. It is a figure which shows the modification of arrangement | positioning of several 2nd opening part. It is a figure which shows the modification of arrangement | positioning of several 2nd opening part.

  Hereinafter, a preferred embodiment of an acoustic structure 100 and a mobile terminal according to the present invention will be described with reference to the drawings. First, a mobile phone 1 as an embodiment of a mobile terminal including the acoustic structure 100 of the present invention will be described with reference to FIGS.

  As shown in FIGS. 1 and 2, the mobile phone 1 according to the present embodiment is a straight type mobile phone 1, and the outer shape of the mobile phone 1 is a housing 2 and an insertion / removal attached to the housing 2 so as to be removable. The member 3 and the strap 4 connected to the insertion / removal member 3 are mainly configured. The mobile phone 1 has a security buzzer function in addition to a call function. The security buzzer function is a function that generates a loud sound by performing a predetermined operation on the mobile phone 1 when the user detects a danger, and alerts people around. In addition, the mobile phone 1 includes an acoustic structure 100 (see FIG. 5) configured to include the housing 2, and when the security buzzer function operates, the acoustic structure 100 generates a large volume.

  The housing | casing 2 has a substantially rectangular parallelepiped shape, as shown in FIG.1 and FIG.2. As shown in FIG. 3, the housing 2 mainly includes a cover panel 21, a front case 22, a rear case 23 as an internal housing, a rear panel 24 as an external housing, and a battery cover 25. Composed.

The front surface 2a of the housing 2 is mainly composed of a cover panel 21 and a front case 22. A display unit 30 and an operation unit 40 are provided on the front surface 2 a of the housing 2.
The display unit 30 is configured by arranging a liquid crystal module (not shown) for displaying various information in an opening 221 provided in the front case 22.
The operation unit 40 is configured by exposing a plurality of operation keys 41 a to the outer surface of the front case 22. A predetermined function is assigned to each of the plurality of operation keys 41a (key assignment). In the cellular phone 1, when a plurality of operation keys 41a are pressed by the user, an operation corresponding to a function assigned to each of the plurality of operation keys 41a is executed. The operation unit 40 is formed on the lower end side which is one end in the longitudinal direction of the housing 2.
The cover panel 21 is made of a transparent member, and is disposed on the outer surface side of the front case 22 so as to cover the opening 221 in which the liquid crystal module is disposed. As a result, the liquid crystal module disposed in the opening 221 is exposed to the front surface 2 a of the housing 2 through the cover panel 21.

  In addition, a voice output unit 26 is formed on the front surface 2a of the housing 2 to output the voice of the other party of the call when the mobile phone 1 is used. The audio output unit 26 is formed on the upper end side which is the other end in the longitudinal direction of the housing 2.

As shown in FIGS. 2 and 3, the back surface 2 b of the housing 2 is mainly composed of a rear case 23, a rear panel 24, and a battery cover 25.
The rear case 23 is provided with a first recess 231 and a second recess 232. The first recess 231 and the second recess 232 are formed by recessing the outer surface of the rear case 23.

As shown in FIGS. 3 and 4, the first recess 231 has a rectangular shape in plan view, and is formed at a substantially central portion in the longitudinal direction of the rear case 23. A battery (not shown) serving as a power source for operating the mobile phone 1 is accommodated in the first recess 231.
The second recess 232 is formed at a substantially central portion in the width direction of the rear case 23 on one end (upper end) side in the longitudinal direction of the rear case 23, and has a substantially circular shape in plan view. A cover member 130 described later is attached to the second recess 232 so as to cover the second recess 232. In addition, the bottom surface of the second recess 232 is formed in a planar shape. A second opening 122 of the duct portion 120 described later is formed on the bottom surface of the second recess 232.

The rear panel 24 is attached to the outer surface side of the rear case 23 so as to cover the rear case 23. The rear panel 24 is provided with an opening 241 formed in substantially the same shape as the planar shape of the first recess 231 and a plurality of sound emission holes 242. The opening 241 is disposed at a position where the first recess 231 and the casing 2 overlap in the thickness direction in a state where the rear panel 24 is attached to the outer surface side of the rear case 23. The plurality of sound emitting holes 242 are arranged at positions where the second recess 232 and the casing 2 overlap in the thickness direction with the rear panel 24 attached to the outer surface side of the rear case 23 (see FIG. 5).
The battery cover 25 is disposed on the outer surface side of the rear panel 24 so as to cover the first recess 231 and the opening 241.

As shown in FIG. 3, each of the front case 22 and the rear case 23 has a concave inner surface. The front case 22 and the rear case 23 are arranged so that their concave inner surfaces face each other, and are joined so that their outer peripheral edges overlap each other.
Between the front case 22 and the rear case 23, a circuit board (not shown) on which a plurality of electronic components that perform various functions of the mobile phone 1 are mounted and a plurality of sounding elements 110 (see FIG. 5) to be described later. ) Etc. are accommodated. The sound generation element 110 is an element that emits sound, and is a concept including a ringing element, a speaker, and the like.

As shown in FIGS. 1 and 2, the insertion / removal member 3 is provided on a side surface located on one end (upper end) side in the longitudinal direction of the housing 2.
The strap 4 includes a string-like member 41 whose base end side is connected to the insertion / removal member 3, and a gripping member 42 connected to the distal end side of the string-like member 41.
The insertion / removal member 3 is pulled out of the housing 2 by gripping and pulling the gripping member 42 of the strap 4.

  Next, the acoustic structure 100 in the mobile phone 1 will be described. 5 is a cross-sectional view taken along the line XX of FIG. 6 is a partially enlarged view of FIG. 5, and is a cross-sectional view showing a state where the cover member 130 is fixed to the housing 2.

  As shown in FIGS. 5 and 6, the acoustic structure 100 of the present embodiment includes a rear case 23 as an internal housing, a rear panel 24 as an external housing in which a plurality of sound emission holes 242 are formed, The sound generating element 110, the two duct portions 120, the cover member 130 disposed between the duct portion 120 and the rear panel 24, and a first cavity that is a space formed between the duct portion 120 and the cover member 130 Portion 140, second cavity 150 that is a space formed between cover member 130 and rear panel 24, first adhesive member 160 that bonds cover member 130 and rear case 23, cover member 130, and rear panel And a second adhesive member 170 for adhering to 24.

As described above, the plurality of sound emission holes 242 are provided at positions where the second recess 232 of the rear case 23 and the casing 2 overlap in the thickness direction of the rear panel 24.
Each of the two sound generating elements 110 has a sound output unit 111 formed on a predetermined surface, and outputs sound as a sound wave from the sound output unit 111. As shown in FIGS. 4 and 5, these two sound generating elements 110 are respectively disposed in the vicinity of the portion where the second recess 232 is formed between the front case 22 and the rear case 23. These sound generating elements 110 are electrically connected to a battery (not shown) via a circuit board (not shown), and output sound by receiving supply of electric power from the battery. Further, the electrical connection between the battery and the sound generating element 110 is cut off by inserting the above-described insertion / removal member 3 into the housing 2. The disconnection of the electrical connection is released by extracting the insertion / removal member 3 from the housing 2.

  Two duct sections 120 are provided corresponding to the two sound generating elements 110 and function as sound transmission paths for transmitting sound output from the sound generating elements 110. The duct portion 120 includes a first opening 121 formed on one end side and a second opening 122 formed on the other end side. The first opening 121 is disposed close to the sound generating element 110 and opens toward the sound output unit 111. The second opening 122 is provided on the bottom surface of the second recess 232 of the rear case 23. More specifically, the two second openings 122 of the two duct portions 120 are disposed in the vicinity of each other at the substantially central portion of the second recess 232. Here, the bottom surface of the second recess 232 is formed in a planar shape, and the surface direction of the bottom surface is formed substantially perpendicular to the thickness direction of the housing 2. As a result, the two second openings 122 are opened in the thickness direction of the housing 2. As a result, the sound output from the sound generation element 110 is guided to the sound emission hole 242 side by the duct portion 120.

  In the present embodiment, the two duct portions 120 are configured by through holes formed integrally with the rear case 23. The lengths of the two duct portions 120 are substantially equal to each other. The sound generation element 110 is fixed to the inner surface of the rear case 23 via a sponge 112 disposed around the sound output unit 111.

The cover member 130 is disposed between the second opening 122 and the sound emission hole 242 in the duct portion 120. More specifically, the cover member 130 is disposed so as to cover the second recess 232 of the rear case 23 and substantially parallel to the bottom surface of the second recess 232. The cover member 130 has a wave receiving surface 131 located on the duct portion 120 side and a wave transmitting surface 132 located on the sound emission hole 242 side. Here, as described above, the two second openings 122 are provided at a substantially central portion of the bottom surface of the second recess 232, and the cover member 130 is disposed so as to cover the second recess 232. . That is, the two second openings 122 are disposed so as to face the substantially central portion of the wave receiving surface 131.
The cover member 130 is preferably composed of a liquid-impermeable member. Examples of the liquid-impermeable member include a thin-film resin member and a microporous membrane member having a property of allowing gas to pass but not allowing liquid to pass.

As shown in FIG. 6, the first adhesive member 160 is configured by laminating a waterproof double-sided tape 161, a sheet member 162 made of polyethylene terephthalate, and a double-sided tape 163. In the first adhesive member 160, one surface of the double-sided tape 163 is bonded to the peripheral portion of the wave receiving surface 131 of the cover member 130, and one surface of the double-sided tape 161 is bonded to the bottom surface of the second recess 232 of the rear case 23. Is done.
As shown in FIG. 6, the second adhesive member 170 is configured by laminating a waterproof double-sided tape 171, a sheet member 172 made of polyethylene terephthalate, and a double-sided tape 173. In the second adhesive member 170, one surface of the double-sided tape 171 is bonded to the peripheral portion of the wave transmission surface 132 of the cover member 130, and one surface of the double-sided tape 173 is bonded to the inner surface of the rear panel 24.

  As described above, the cover member 130 is fixed to the rear case 23 and the rear panel 24 via the first adhesive member 160 and the second adhesive member 170 only at the periphery. Thereby, the cover member 130 can vibrate when the sound output from the second opening 122 of the duct portion 120 is received on the wave receiving surface 131 side.

  In the present embodiment, as shown in FIG. 6, the thickness L1 of the first adhesive member 160 (the length in the direction along the thickness direction of the housing) L1 is configured to be thicker than the thickness L2 of the second adhesive member 170. Is done.

The first cavity 140 is a space surrounded by the outer surface of the rear case 23, the wave receiving surface 131 of the cover member 130, and the first adhesive member 160.
The second cavity portion is a space surrounded by the wave transmission surface 132 of the cover member 130, the inner surface of the rear panel 24, and the second adhesive member 170.

As described above, since the thickness L1 of the first adhesive member 160 is configured to be thicker than the thickness L2 of the second adhesive member 170, the volume of the first cavity part 140 is the volume of the second cavity part 150. Is bigger than.
In the present embodiment, the cover member 130 is made of a liquid-impermeable member, and the first adhesive member 160 is also made of a waterproof double-sided tape. Therefore, the liquid such as water that has entered the second cavity 150 through the plurality of sound emitting holes 242 from the outside of the housing 2 is supplied to the first cavity 140 by the cover member 130 and the first adhesive member 160. Intrusion is prevented.

Next, the operation of the security buzzer function in the mobile phone 1 of the present embodiment will be described.
In the normal state of the mobile phone 1, an insertion / removal member (not shown) is inserted into the housing 2. In this state, the electrical connection between the two sound generating elements 110 and the battery is interrupted. When the insertion / removal member is removed from the housing 2 in this state, the electrical connection between the two sound generating elements 110 and the battery is released, and electricity is supplied from the battery to the two sound generating elements 110. The sound generation element 110 emits sound in synchronization (simultaneously). Then, the sound output from the two sound generating elements 110 is simultaneously transmitted from the first opening 121 to the second opening 122 through the inside of the duct 120.

  Here, since the lengths of the two duct portions 120 are configured to be substantially equal to each other, the sound output from the two sound generating elements 110 that emits the sound in synchronization is transmitted from the second opening portion 122 to the cover member 130. Are simultaneously output toward the wave receiving surface 131. Then, the sound output from the two second openings 122 is simultaneously transmitted to the cover member 130, so that the cover member 130 vibrates greatly. As described above, the cover member 130 is vibrated by the sound output from the second opening 122, so that attenuation of the sound output from the wave transmission surface 132 of the cover member 130 is reduced. Thereby, the sound output from the two sound generating elements 110 is efficiently output to the outside.

  The acoustic structure 100 of the present embodiment described above and the mobile phone 1 having the acoustic structure 100 have the following effects.

Two sound generating elements 110 are arranged inside the housing 2, and two duct portions 120 are provided for guiding sound output from the two sound generating elements 110 to the sound emission hole 242 side. As a result, even when the two sound generating elements 110 are arranged apart from each other, the sound output from the two sound generating elements 110 is directed toward the cover member 130 disposed between the duct portion 120 and the sound emission hole 242. Can output intensively. Therefore, even when the cover member 130 is disposed and the acoustic structure 100 is provided with waterproof performance, it is possible to reduce a decrease in output sound volume. In addition, since the acoustic structure 100 includes the two sounding elements 110, each of the two sounding elements 110 can be miniaturized, and thus the acoustic structure 100 can be miniaturized. As a result, the mobile phone 1 including the acoustic structure 100 can be reduced in size.
In addition, since the sound output from the two sound generating elements 110 can be guided to the predetermined position by the two duct portions 120, the degree of freedom in arranging the sound generating elements 110 can be improved.

  Further, the two second openings 122 are arranged so as to face the substantially central portion of the wave receiving surface 131 of the cover member 130. As a result, the sound output from the two second openings 122 is transmitted to the substantially central portion of the wave receiving surface 131 where the vibration of the cover member 130 can be maximized, so that the sound can be output at a higher volume.

  Further, the two second openings 122 are formed on the bottom surface of the second recess 232 which is the same plane, and the bottom surfaces are arranged substantially parallel to the wave receiving surface 131. Accordingly, since the two second openings 122 open toward the wave receiving surface 131, the transmission efficiency of the sound output from the two second openings 122 to the cover member 130 can be improved. In addition, since the two second openings 122 do not face each other, it is possible to prevent sounds generated from the two sound generating elements 110 from canceling each other and to transmit one of the two duct portions 120. The transmitted sound can be prevented from being transmitted to the other duct portion 120. Therefore, sound can be output at a higher volume.

  In addition, the wave receiving surface 131 and the rear case 23 are bonded by the first adhesive member 160, and the wave transmitting surface 132 and the rear panel 24 are bonded by the second adhesive member 170 to fix the cover member 130 to the housing 2. Accordingly, the first cavity portion 140 can be formed between the rear case 23 and the wave receiving surface 131 of the cover member 130, and the second cavity portion 150 can be formed between the wave transmitting surface 132 of the cover member 130 and the rear panel 24. . Therefore, the sound output from the duct part 120 by the first cavity part 140 can be suitably transmitted to the cover member 130, and the contact between the vibrating cover member 130 and the rear panel 24 can be prevented by the second cavity part 150. Prevents a decrease in volume output to the outside.

  Further, the thickness L1 of the first adhesive member 160 is configured to be thicker than the thickness L2 of the second adhesive member 170. Therefore, since the volume of the 1st cavity part 140 can be ensured more largely, the transmission efficiency to the cover member 130 of the audio | voice output from the duct part 120 can be improved.

As mentioned above, although one Embodiment of this invention was described, this invention can be implemented with a various form, without being restrict | limited to embodiment mentioned above.
For example, in the present embodiment, the two second openings 122 are arranged at the substantially central portion of the bottom surface of the second recess 232, but the present invention is not limited to this. That is, the two second openings 122a may be arranged so as to be biased to one side of the bottom surface of the second recess 232 as shown in FIG. 7A, and as shown in FIG. You may arrange | position at intervals. Note that, from the viewpoint of suitably transmitting sound to the cover member 130, the two second openings are preferably arranged symmetrically with respect to the center of the second recess 232.

  In the present embodiment, the acoustic structure 100 includes the two sound generating elements 110, but the present invention is not limited to this. That is, the acoustic structure may include three or four or more sound generating elements.

  Moreover, in this embodiment, although the two duct parts 120 were comprised by the rear case 23, it is not restricted to this. That is, two sound generating elements may be accommodated in a housing constituted by a resin member, and two duct portions may be constituted by this housing.

  Moreover, in this embodiment, although the acoustic structure 100 was provided in the mobile telephone 1, it is not restricted to this. That is, the acoustic structure may be applied to a security buzzer alone.

The acoustic structure 100 of the present invention can be applied to a mobile terminal other than the mobile phone 1.
Examples of portable terminals other than cellular phones include PHS (registered trademark: Personal Handyphone System), PDA (Personal Digital Assistant), and notebook computers.

1 Mobile phone (mobile terminal)
2 Housing 23 Rear case (internal housing)
24 Rear panel (external housing)
100 Acoustic structure 110 Sound generating element (ringing element, speaker)
120 Duct portion 121 First opening portion 122 Second opening portion 130 Cover member 131 Wave receiving surface 132 Wave transmitting surface 140 First cavity portion 150 Second cavity portion 160 First adhesive member 170 Second adhesive member 242 Sound emitting hole

Claims (8)

A housing in which sound emitting holes are formed;
A plurality of sound generating elements arranged inside the housing and outputting sound;
A first opening that opens toward the sound generating element is formed on one end side, and a second opening that opens toward the sound emitting hole is formed on the other end side, and is output from each of the plurality of sound generating elements. A plurality of duct portions for guiding sound to the sound emission hole side;
A cover member having a wave receiving surface located on the duct portion side and a wave sending surface located on the sound emission hole side, disposed between the second opening in the duct portion and the sound emission hole;
An acoustic structure comprising: a first cavity portion formed between the second opening and the cover member in the duct portion.   2. The acoustic structure according to claim 1, wherein the second opening of each of the plurality of ducts is disposed to face a substantially central portion of the wave receiving surface.   The sound according to claim 1 or 2, wherein the second opening of each of the plurality of ducts is formed in the same plane, and the plane in which the second opening is formed is arranged substantially parallel to the wave receiving surface. Construction. The housing includes an internal housing disposed on the wave receiving surface side of the cover member and an external housing disposed on the wave transmitting surface side of the cover member and formed with the sound emitting hole. And
The cover member bonds the vicinity of the periphery of the wave receiving surface of the cover member and the inner housing to the first adhesive member, and the vicinity of the periphery of the wave transmitting surface of the cover member and the external housing. The acoustic structure according to claim 1, wherein the acoustic structure is fixed to the housing by a second adhesive member.   5. The length of the first adhesive member in the direction along the thickness direction of the casing is configured to be thicker than the length of the second adhesive member in the direction along the thickness direction of the casing. Acoustic structure. A plurality of sound generating elements that generate sound waves;
A cover member that receives and vibrates a sound wave generated from each of the plurality of sound generating elements;
A plurality of duct portions for guiding sound waves generated from each of the plurality of sound generating elements to the cover member side;
An acoustic structure comprising: a first cavity portion formed between the cover member and a plurality of duct portions.   The acoustic structure according to claim 1, wherein the cover member is made of a thin film resin or a microporous membrane member.   A portable terminal comprising the acoustic structure according to claim 1.

Images