JP2012186549A - Housing structure for mobile terminal and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a housing structure for a mobile terminal, which is improved in acoustic characteristics while optimally suppressing deformation of a housing of a mobile terminal, and to provide a method for manufacturing the same.SOLUTION: The housing structure for a mobile terminal comprises: a first air chamber which is formed in a housing and communicates with the outside via a first through-hole; a second air chamber which is formed adjacent to the first air chamber in the housing and communicates with the first air chamber via a vent hole; a sound source which is provided in the second air chamber and communicates with the first air chamber via a second through-hole; and a sheet member which is provided in the vent hole, closes the vent hole, and has waterproofness and air permeability. The vent hole is provided with a projection part projecting to the center side of the vent hole.

Description

  The present invention relates to a housing structure of a portable terminal such as a waterproof cellular phone and a method for manufacturing the same.

  In general, since a casing of a portable terminal having a waterproof function is configured to have high airtightness, a pressure difference is generated inside and outside the casing due to a rapid temperature change or a change in atmospheric pressure. Such a pressure difference may cause deformation of the housing or damage to the electronic component. Therefore, the housing in which the sound hole and the air hole are formed, the sound source disposed inside the housing so as to face the sound hole, and the waterproof and air permeability, and closes the sound hole and the air hole. A portable terminal having a waterproof sheet is known (see, for example, Patent Document 1).

  In the portable terminal, for example, when the cross-sectional area of the vent hole is small, it is difficult to discharge the air inside the casing, and the casing is deformed in a swelled state even after a certain period of time. On the other hand, by forming the cross-sectional area of the vent hole larger, air inside the casing can be smoothly discharged from the vent hole, and the swelling of the casing and the like can be instantly restored to the original state.

JP 2010-109851 A

  However, in the portable terminal described above, fluctuations in the air pressure inside the housing that occur when the speaker is ringing may cause abnormal vibrations and noises. Moreover, since the freedom degree of a waterproof sheet increases and it becomes easy to vibrate, so that the cross-sectional area of a vent hole is widened, the rattling sound by abnormal vibration at the time of speaker ringing becomes large. Furthermore, simply increasing the cross-sectional area of the vent hole will increase sound leakage, thereby deteriorating the acoustic characteristics of the speaker.

  The present invention has been made in order to solve such problems, and provides a mobile terminal casing structure with improved acoustic characteristics while optimally suppressing deformation of the mobile terminal casing, and a method of manufacturing the same. The main purpose.

  In one aspect of the present invention for achieving the above object, there is provided a first air chamber formed in a housing and communicating with the outside through a first through hole, and adjacent to the first air chamber in the housing. A second air chamber formed and communicated with the first air chamber via a vent hole; a sound source provided in the second air chamber and communicated with the first air chamber via a second through hole; A portable terminal housing structure provided on a vent hole, and having a waterproof and breathable sheet member that closes the vent hole and has a waterproof property and a breathability, wherein the projection protrudes toward the center of the vent hole Is a housing structure of a mobile terminal, characterized in that.

  On the other hand, according to one aspect of the present invention for achieving the above object, a first air chamber that is formed in a housing and communicates with the outside through a first through hole, and the first air chamber is adjacent to the housing. A second air chamber formed in communication with the first air chamber via a vent hole, and a sound source provided in the second air chamber and in communication with the first air chamber via a second through hole. A method for manufacturing a casing structure of a portable terminal, comprising: a sheet member that is provided in the vent hole, closes the vent hole, and has a waterproof property and a breathable property, and includes a first air chamber and a second air chamber. A method for manufacturing a casing structure of a portable terminal may be provided, wherein a protrusion is formed integrally with the partition wall and protrudes toward the center of the vent hole.

  ADVANTAGE OF THE INVENTION According to this invention, the housing structure of the portable terminal which improved the acoustic characteristic, suppressing the deformation | transformation of the casing of a portable terminal, and its manufacturing method can be provided.

It is a perspective view which shows schematic structure of the mobile telephone by which the housing structure which concerns on Embodiment 1 of this invention was mounted. It is the perspective view which looked at the mobile telephone shown in FIG. 1 from the back surface. It is sectional drawing at the time of cut | disconnecting the housing lower part of the portable terminal shown in FIG. 2 by straight line AA ', and is a figure which shows the housing structure of a housing lower part. It is the top view which looked at the vent shown in FIG. 3 from the B direction. It is sectional drawing which shows the schematic structure of the housing structure of the mobile telephone which concerns on Embodiment 2 of this invention. It is sectional drawing which shows schematic structure of the housing structure of the mobile telephone which concerns on Embodiment 3 of this invention.

Embodiment 1 FIG.
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a schematic configuration of a mobile phone on which the housing structure according to the first embodiment is mounted. FIG. 2 is a perspective view of the mobile phone shown in FIG. A mobile terminal housing structure 10 according to the first exemplary embodiment is mounted on, for example, a foldable mobile phone 1 as shown in FIG.

  The mobile phone 1 according to the first embodiment is connected for communication with a general phone or other mobile phone via a radio base station. The mobile phone 1 includes a housing upper portion 2 and a housing lower portion 3 that is rotatably connected to the housing upper portion 2 via a hinge mechanism or the like. The housing structure 10 is mounted on the foldable mobile phone 1, but is not limited thereto, and for example, the housing upper portion and the housing lower portion may be mounted on an integrated or sliding mobile phone. It can be mounted on mobile terminals.

  The housing upper part 2 is provided with a receiver unit 4 provided at the upper end of the housing 2 for outputting the voice of the other party, and a display unit 5 for displaying various information. The receiver unit 4 is a part where the user listens to hear the voice of the other party of the call output from the waterproof speaker 16. The display unit 5 has a structure in which, for example, a screen sheet is pasted on the front surface of a liquid crystal or organic EL screen, and is a part that displays necessary information for the user. It has a function to notify.

  The lower part 3 covers a key operation unit 6 that can be operated by a user, a microphone unit 7 provided at the lower end of the housing, and a rechargeable battery such as a built-in lithium battery. The battery cover 8 is provided.

  The key operation unit 6 is provided with key operation buttons such as numeric keys, alphabet keys (character keys), and cross keys, and the user operates the key operation unit 6 to perform dial input and Various settings provided in the mobile phone 1 can be operated. The microphone unit 7 has a function of inputting voice on the user side to be transmitted to the other party using a microphone and converting the input voice into an electric signal that can be transmitted.

  The battery cover 8 is provided with measures such as a double lid and a packing structure to maintain waterproofness, and is attached so that the user can open and close it.

  FIG. 3 is a cross-sectional view of the lower part of the mobile terminal shown in FIG. 2 taken along a line AA ′, and is a view showing the structure of the lower part of the casing. As shown in FIG. 3, the housing structure 10 of the housing lower portion 3 according to the present embodiment is adjacent to the front air chamber (first air chamber) 11 formed in the housing lower portion 3 and the front air chamber 11. And a main body air chamber (second air chamber) 12 formed.

  The front air chamber 11 is provided with a decorative panel 13 on its upper surface, and is defined and sealed from the outside by the decorative panel 13. In the decorative panel 13, three speaker sound holes (first through holes) 14 are formed along the longitudinal direction of the housing lower portion 3, and the front air chamber 11 communicates with the outside through the speaker sound holes 14. is doing. In addition, the number and position of the speaker sound holes 14 provided in the decorative panel 13 are not limited to the above example, and may be arbitrary.

  In the main body air chamber 12, a waterproof speaker (sound source) 16 having a waterproof function, which is tightly fixed using a waterproof double-sided tape 15 or the like, is disposed. The main body air chamber 12 is a hermetically sealed space, and a through hole (second through hole) 17 that connects the main body air chamber 12 and the front air chamber 11 to the partition wall between the main body air chamber 12 and the front air chamber 11. And an air hole 18 is provided.

  Here, since the waterproof speaker 16 is disposed adjacent to and opposed to the through hole 17, the air permeability is affected by the position and accuracy of the waterproof speaker 16, the configuration of the waterproof speaker 16, and the like. Performance becomes unstable. Therefore, as described above, the vent hole 17 is provided separately from the through hole 17. In addition, although one ventilation hole 18 is provided in the partition wall of the main body air chamber 12 and the front air chamber 11, the number of the ventilation holes 18 provided is not limited to this and may be arbitrary.

  The waterproof speaker 16 disposed in the main body air chamber 12 communicates with the front air chamber 11 through the through hole 17. Therefore, the waterproof speaker 16 communicates with the outside through the through hole 17, the front air chamber 11, and the speaker sound hole 14, and can output the sound generated through these to the outside. The waterproof speaker 16 has, for example, a function of outputting a sound (melody) at the time of an incoming call or downloading a melody, a function of notifying a user of an incoming call, or a function of notifying a user of information by sound. Have. When using the hands-free function, the other party's voice (received sound) is output.

  In the main body air chamber 12, there are parts (DSP (Digital Signal Processing) and CSP (Chip Size Package) that drive and control various functions of the mobile phone 1 (drainage function, ringing of melody, incoming and outgoing calls, Internet connection, mail transmission and reception, etc.) ), A sound source IC, a D / A converter, an A / D converter, an amplifier, a resistor, a capacitor, and the like) are mounted. For example, the DSP has a function of transmitting music / audio signals stored in the sound source IC to the waterproof speaker 16 via a D / A converter and an SPK_amplifier.

  On the lower surface (outer surface) of the housing lower part 3, a key sheet 21 on which a numeric key and a cross key are printed is provided corresponding to the key operation button 6. A key flex 22 is provided on the inner side (upper side) of the key sheet 21 in the lower body portion 3. The key flexible board 22 on which the key operation buttons 6 are mounted is made of a rigid sheet metal, is fixed to the front side of the lower part 3 of the housing, and a key sheet 21 is attached to the front surface thereof.

  The air hole 18 that communicates between the main chamber 12 and the front chamber 11 is, for example, when thermally expanding air that is sealed in the main chamber 11 and expanded by heat generated from the substrate 19 or the like, or when the battery cover 8 is worn. It is a hole having a ventilation performance for discharging the generated compressed air or the like from the inside of the main body air chamber 12. A waterproof and breathable waterproof sheet (sheet member) 23 that closes the vent hole 18 is fixed to the upper surface (front air chamber side) of the vent hole 18 using a waterproof double-sided tape or the like.

  In addition, although the cross section of the vent hole 18 is formed in a substantially rectangular shape, it is not limited thereto, and may be, for example, a circular shape, an elliptical shape, or an arbitrary shape. Although the waterproof sheet 23 is formed in a substantially rectangular shape along the cross-sectional shape of the vent hole 18 so as to block the vent hole 18, the shape of the waterproof sheet 23 is not limited to this and may be arbitrary. The air in the main body air chamber 12 is discharged to the outside through the vent hole 18, the front air chamber 11, and the speaker sound hole 14.

  In general, the larger the cross-sectional area of the vent hole, the faster the air in the main body chamber can be released, and the deformation of the lower part of the housing can be suppressed optimally. On the other hand, when the cross-sectional area of the ventilation hole is increased, the degree of freedom of the waterproof sheet is increased and the vibration is easily caused. For this reason, abnormal vibrations are generated due to pressure fluctuations in the main body chamber and the front air chamber that occur when the waterproof speaker is ringing, and a rattling noise or the like is likely to occur. Further, since sound leakage increases, the acoustic characteristics of the waterproof speaker are also deteriorated (particularly, a low frequency band below the resonance frequency).

  Therefore, in the housing structure 10 according to the present embodiment, the vent hole 18 is provided with a protrusion 24 that protrudes toward the center of the vent hole 18 while ensuring a sufficient size of the vent hole 18. . The protrusion 24 has a function of reducing the sound path area of the vent hole 18. For example, as shown in FIG. 4, the projecting portion 24 is formed so that the opening area of the vent hole 18 on the main body air chamber 12 side is reduced to about 2/3. The protrusion 24 may be formed so that the opening area is reduced to approximately ½, and the shape of the formed protrusion 24 may be arbitrary.

  Further, the protrusion 24 is formed integrally with the partition wall between the front air chamber 11 and the main body air chamber 12 in the lower part 3 of the housing 3 using a mold resin or the like. In this case, the protrusions may be formed by attaching a plastic plate or the like with double-sided tape, and the protrusions 24 may be formed using any method.

  As described above, in the housing structure 10 of the mobile phone 1 according to the first embodiment, the vent hole 18 that connects the main body air chamber 11 and the front air chamber 12 has the protrusion 24 that protrudes toward the center of the air hole 18. Is provided. Accordingly, a large ventilation area of the waterproof sheet 23 in the ventilation hole 18 can be secured, the air in the main body air chamber 12 can be instantaneously released, and the deformation of the lower body portion 3 can be suppressed optimally.

  For example, even if the air sealed in the main body air chamber 12 of the lower part 3 of the casing 3 expands due to a temperature change or the like and the screen sheet or the key sheet 21 is deformed, the expanded air is instantaneously released from the vent hole 18. Therefore, the shape of the screen sheet or the key sheet 21 is instantaneously returned to the original state.

  Furthermore, the instantaneous air pressure change with respect to the waterproof sheet 23 can be suppressed by the protrusion 24, and the structure is hardly affected by the pressure change. Therefore, the acoustic effect is improved without causing abnormal vibration due to pressure fluctuation in the main body air chamber 12. That is, the acoustic characteristics can be improved while optimally suppressing deformation of the casing of the mobile phone 1.

Embodiment 2. FIG.
FIG. 5 is a cross-sectional view showing a schematic configuration of a casing structure of the mobile phone according to the second embodiment. In the housing structure 10 according to the first embodiment, the waterproof sheet 23 is provided on the front air chamber 11 side (outside) of the vent hole 18, and the protrusion 24 is on the main body chamber 12 side (inside) of the vent hole 18. In the housing structure 20 according to the second embodiment, the waterproof sheet 23 is provided on the main body air chamber 12 side (inside) of the vent hole 18, and the protrusion 24 is the front air chamber of the vent hole 18. It is the structure provided in 11 side (outside).

  The other structure of the housing structure 20 according to the second embodiment is substantially the same as that of the housing structure 10 according to the first embodiment. Therefore, the same parts are denoted by the same reference numerals and detailed description thereof is omitted.

  In the second embodiment, the protrusion 24 may be provided on both the front air chamber 11 side and the main body air chamber 12 side of the vent hole 18, that is, the ventilation area of the waterproof sheet 23 is sufficient. If the waterproof sheet 23 has a structure that can be secured and is not easily affected by instantaneous air pressure change, the protrusion 24 can be provided at an arbitrary position of the vent hole 18.

Embodiment 3 FIG.
FIG. 6 is a cross-sectional view showing a schematic configuration of a casing structure of the mobile phone according to the third embodiment. In the housing structure 10 according to the first embodiment, the waterproof speaker 16 having a waterproof function is disposed in the main body air chamber 12, but in the main body air chamber 12 according to the third embodiment, Is provided with a non-waterproof speaker 25 having no waterproof function, and a speaker waterproof sheet 26 is attached to the front surface of the speaker 25 using a waterproof double-sided tape or the like.

  The other structure of the housing structure 30 according to the third embodiment is substantially the same as that of the housing structure 10 according to the first embodiment. Therefore, the same parts are denoted by the same reference numerals and detailed description thereof is omitted.

  Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention.

  For example, the casing structures 10, 20, and 30 according to the first to third embodiments may be applied to a receiver mounting structure.

  Further, the casing structures 10, 20, and 30 according to the first to third embodiments are mounted on the mobile phone 1, but are not limited thereto, and are waterproof, such as a pager, PHS, music playback player, digital camera, and the like. It can be mounted on any portable terminal having a sealed structure for holding.

  Furthermore, part or all of the above-described embodiments can be described as in the following supplementary notes, but is not limited thereto.

(Appendix 1)
A first air chamber formed in the housing and communicating with the outside through the first through hole, and formed in the housing adjacent to the first air chamber, through the first air chamber and the vent hole A second air chamber that communicates with the sound source that is provided in the second air chamber and communicates with the first air chamber via a second through hole; and provided in the vent hole, A portable terminal housing structure comprising a breathable sheet member, wherein the vent is provided with a protrusion that protrudes toward the center of the vent. Frame structure.
(Appendix 2)
(Appendix 1) The portable terminal has a housing structure, wherein the protrusion is provided on the second air chamber side of the vent hole, and the sheet member is provided on the first air chamber side of the vent hole. A portable terminal housing structure characterized by that.
(Appendix 3)
(Appendix 1) The portable terminal has a housing structure, wherein the protrusion is provided on the first air chamber side of the vent hole, and the sheet member is provided on the second air chamber side of the vent hole. A portable terminal housing structure characterized by that.
(Appendix 4)
(Appendix 1) A portable terminal housing structure, wherein the protrusion is provided on each of the first air chamber side and the second air chamber side of the vent hole. Frame structure.
(Appendix 5)
(Attachment 1) to (Attachment 4) is a housing structure of any one of the portable terminals, wherein the protrusion is formed integrally with a partition wall between the first air chamber and the second air chamber. , Characterized in that a portable terminal frame structure.
(Appendix 6)
A portable terminal casing structure according to any one of (Appendix 1) to (Appendix 5), wherein the sound source has a waterproof function.
(Appendix 7)
A mobile terminal casing structure according to any one of (Appendix 1) to (Appendix 6), wherein the mobile terminal is a mobile phone having a waterproof function.
(Appendix 8)
A first air chamber formed in the housing and communicating with the outside through the first through hole, and formed in the housing adjacent to the first air chamber, through the first air chamber and the vent hole A second air chamber that communicates with the sound source that is provided in the second air chamber and communicates with the first air chamber via a second through hole; and provided in the vent hole, And a projecting portion that is integral with a partition wall of the first air chamber and the second air chamber and protrudes toward the center of the air hole. A manufacturing method of a casing structure of a portable terminal, characterized in that

DESCRIPTION OF SYMBOLS 1 Cellular phone 2 Case upper part 3 Case lower part 10, 20, 30 Case structure 11 Front air chamber 12 Body air chamber 13 Cosmetic panel 14 Speaker sound hole 15 Double-sided tape 16 Waterproof speaker 17 Through hole 18 Vent hole 19 Substrate 21 Key Sheet 22 Key flexible 23 Waterproof sheet 24 Projection

Claims (8)

A first air chamber formed in the housing and communicating with the outside through the first through hole;
A second air chamber formed in the housing adjacent to the first air chamber and communicating with the first air chamber via a vent;
A sound source provided in the second air chamber and communicating with the first air chamber via a second through hole;
A portable terminal housing structure provided with the air hole, the water hole and the waterproof and air permeable sheet member,
A casing structure for a portable terminal, wherein the vent is provided with a protrusion protruding toward the center of the vent. A casing structure for a portable terminal according to claim 1,
The housing structure of the portable terminal, wherein the protrusion is provided on the second air chamber side of the vent hole, and the sheet member is provided on the first air chamber side of the vent hole. A casing structure for a portable terminal according to claim 1,
The housing structure of a portable terminal, wherein the protrusion is provided on the first air chamber side of the vent hole, and the sheet member is provided on the second air chamber side of the vent hole. A casing structure for a portable terminal according to claim 1,
The housing structure of the portable terminal, wherein the protrusion is provided on each of the first air chamber side and the second air chamber side of the vent hole. A portable terminal housing structure according to any one of claims 1 to 4,
The housing structure of the portable terminal, wherein the protrusion is formed integrally with a partition wall between the first air chamber and the second air chamber. A portable terminal housing structure according to any one of claims 1 to 5,
A portable terminal housing structure, wherein the sound source has a waterproof function. A portable terminal housing structure according to any one of claims 1 to 6,
A portable terminal casing structure, wherein the portable terminal is a cellular phone having a waterproof function. A first air chamber formed in the housing and communicating with the outside through the first through hole;
A second air chamber formed in the housing adjacent to the first air chamber and communicating with the first air chamber via a vent;
A sound source provided in the second air chamber and communicating with the first air chamber via a second through hole;
A method of manufacturing a casing structure of a mobile terminal, comprising: a sheet member provided in the vent hole, and having a waterproof and breathable sheet member that closes the vent hole;
A method for manufacturing a casing structure of a portable terminal, wherein a protrusion is formed integrally with a partition wall of the first air chamber and the second air chamber and protrudes toward the center of the vent hole.

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