JP2018019391A - Mobile terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure capable of achieving both waterproofness and sound insulation with respect to a microphone provided in a housing.SOLUTION: The structure includes: a waterproof sheet 60 covering from the inside a microphone opening 13 formed in a housing 11 to face a sound collecting surface 52 of a microphone 50 housed in the housing 11; and a sound insulation section 70 for annually surrounding a region S on which the microphone opening 13 of the waterproof sheet 60 is projected and the sound collecting surface 52 to partition from the other space in the housing.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a portable terminal in which a microphone is accommodated in a housing.

  2. Description of the Related Art Conventionally, as a technique related to a mobile terminal in which a microphone is accommodated in a casing, for example, a mobile terminal device disclosed in Patent Document 1 below is known. In this portable terminal device, a microphone is housed in a lower housing, and the microphone is arranged so that its sound hole surface is exposed from a microphone sound hole formed in a key side case of the lower housing. It is fixed inside the case. Then, the wall provided on the key side case is brought into contact with the holding metal fitting for fixing the sub-board on which the microphone is mounted, so that this wall constitutes a sound insulating wall, and the microphone mounting portion is in a space close to sealing. It is comprised so that it may become.

JP 2008-182296 A

  By the way, the structure fixed to the inside of a case so that the sound collection surface (sound hole surface) of a microphone may be exposed from the opening for microphones (microphone sound hole) formed in a housing | casing like the structure of the patent document 1 mentioned above. However, there is a possibility that water droplets or the like may flow into the sound collecting surface from the microphone opening, and thus there is a problem that waterproofness cannot be secured. For this reason, if the microphone is placed so that the sound collection surface and the microphone opening face each other with the microphone opening covered with a waterproof sheet or the like from the inside, even if the waterproofing can be secured, the outside through the microphone opening Utterance sound etc. leaks from between the microphone opening and the sound collection surface and is easily diffused inside the housing, and there is a problem that volume and clearness are lowered. In addition, when the case is hit or the case is rubbed, reverberation sound (hereinafter also referred to as internal reverberation sound) generated in the case due to external impact or the like is There is a problem that the sound is easily collected through the sound collecting surface.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a configuration that can achieve both waterproofness and sound insulation for a microphone provided in a housing.

In order to achieve the above object, the invention described in claim 1 of the scope of claims
A portable terminal (10) in which a microphone (50) is housed in a housing (11),
The housing is formed with an opening (13) facing the sound collection surface (52) of the microphone,
A waterproof member (60) covering the opening from the inside;
A sound insulating portion (70, 70a, 70b) that annularly surrounds at least a part of a region of the waterproof member on the microphone side where the opening is projected and the sound collection surface and separates it from other internal space. When,
It is characterized by providing.
In addition, the code | symbol in each said parenthesis shows the correspondence with the specific means as described in embodiment mentioned later.

  According to the first aspect of the present invention, an opening facing the sound collection surface of the microphone housed in the housing is formed in the housing, a waterproof member that covers the opening from the inside, and an opening of the surface of the waterproof member on the microphone side. Is provided with a sound insulating part that surrounds at least a part of the area where the sound is projected and the sound collection surface in a ring shape and is partitioned from the other space in the housing.

  As a result, even when a waterproof member is provided in the opening from the inside, the sound insulation portion makes it difficult for utterance sounds from the outside through the opening to leak from between the waterproof member and the sound collection surface. The decrease can be suppressed. And it becomes difficult for an internal reverberation sound to be collected through between the said waterproof member and a sound collection surface, and it can suppress the influence of an internal reverberation sound. Therefore, it is possible to achieve both waterproofness and sound insulation for the microphone provided in the housing.

  In the invention of claim 2, since the sound insulation part is bonded in an annular shape to the waterproof member, the sound insulation part and the waterproof member are brought into close contact with each other, so that the sound hardly leaks, so that the sound insulation property for the microphone can be further enhanced. .

  In the invention according to claim 3, since the sound insulation part is bonded in an annular shape to the microphone, the sound insulation part and the microphone are brought into close contact with each other, so that it is difficult for the sound to leak.

  In the invention of claim 4, since the sound insulation part is constituted by an elastic member, the sound insulation part, the waterproof member and the microphone are brought into close contact by elastically deforming and pressing the sound insulation part against the waterproof member and the microphone at the time of assembly. As a result, it is difficult for sound to leak, so that the sound insulation regarding the microphone can be further enhanced.

  In the invention of claim 5, since the sound insulating part has a press-fitting surface that is press-fitted from the sound collecting surface side and covers the outer peripheral surface of the microphone, the sound insulating part and the microphone are brought into close contact with each other without using an adhesive or the like. Since it becomes difficult to leak, the sound insulation regarding a microphone can further be improved.

  In the invention according to claim 6, the sound insulation portion is an annular step portion in which a surface that is annularly contacted with an outer edge portion surrounding the sound collection surface and a press-fitting surface among surfaces on which the sound collection surface of the microphone is provided. Prepare. Thereby, since the surface where a sound insulation part and a microphone closely_contact | adhere increases and it becomes difficult to leak a sound, the sound insulation regarding a microphone can be improved further.

It is explanatory drawing which shows the structure outline | summary of the portable terminal which concerns on 1st Embodiment, FIG. 1 (A) shows a top view and FIG. 1 (B) shows a side view. FIG. 2 is a block diagram illustrating an electrical configuration of the mobile terminal in FIG. 1. It is sectional drawing explaining the positional relationship of a sound insulation part, a waterproof sheet, and a microphone in 1st Embodiment. It is explanatory drawing explaining the positional relationship of the sound insulation part and microphone which were seen from the opening side for microphones. It is sectional drawing explaining the positional relationship of a sound insulation part, a waterproof sheet, and a microphone in the modification of 1st Embodiment. It is sectional drawing explaining the principal part of the portable terminal which concerns on 2nd Embodiment.

Hereinafter, a first embodiment in which a portable terminal according to the present invention is embodied will be described with reference to the drawings.
A portable terminal 10 shown in FIG. 1 is configured as a portable optical information reading device (for example, a barcode reader, a two-dimensional code reader, etc.), has a longitudinal appearance, and is substantially at one end side thereof. A half region is a gripping region, and is configured to be used while being gripped by a user. The portable terminal 10 is configured as a portable information terminal that is carried by a user and used in various places, for example, and an optical information reading function that optically reads an information code such as a barcode or a two-dimensional code have. In addition, the mobile terminal 10 according to the present embodiment has a call function for transmitting and receiving audio signals via a predetermined communication network, like a general mobile phone.

  As shown in FIGS. 1 (A) and 1 (B), the mobile terminal 10 is formed in a longitudinal shape constituted by assembling an upper case body 11a and a lower case body 11b formed of a synthetic resin material such as ABS resin. An outer case is formed by the casing 11. The upper case body 11a is provided with an operation unit 42 such as function keys and numeric keys operated when inputting predetermined information, a display unit (liquid crystal display 43) for displaying predetermined information, and the like. Has been. Further, the reading port 12 serving as a passage through which illumination light and light from the information code pass is provided near the tip on one side in the longitudinal direction of the lower case body 11b. Further, as shown in FIG. 1A, a microphone opening 13 is formed in a circular shape on the other side in the longitudinal direction of the upper case body 11a.

  As shown in FIG. 2, the mobile terminal 10 mainly includes an optical system such as an illumination light source 21, a light receiving sensor 23, and an imaging lens 27, a memory 35, a control circuit 40, an operation unit 42, a liquid crystal display 43, and the like. It is composed of a microcomputer (hereinafter referred to as “microcomputer”) system and a power supply system such as a power supply unit and a power switch (not shown). In addition, these are mounted on a printed wiring board (not shown) or arranged inside the housing 11.

  The optical system is divided into a light projecting optical system and a light receiving optical system. The illumination light source 21 constituting the light projecting optical system functions as an illumination light source capable of emitting the illumination light Lf, and includes, for example, a red LED and a lens provided on the emission side of the LED. FIG. 2 conceptually shows an example in which the illumination light Lf is irradiated toward the article R to which the information code C is attached.

  The light receiving optical system includes a light receiving sensor 23, an imaging lens 27, a reflecting mirror (not shown), and the like. The light receiving sensor 23 is configured, for example, as a line sensor in which light receiving elements that are solid-state imaging elements such as C-MOS and CCD are arranged one-dimensionally or as an area sensor arranged in two dimensions. Each is configured to output an electric signal corresponding to the intensity of the reflected light Lr. The light receiving sensor 23 is mounted on a printed wiring board (not shown) so as to be able to receive incident light incident through the imaging lens 27.

  The imaging lens 27 functions as an imaging optical system capable of condensing incident light incident from the outside via the reading port 12 and forming an image on the light receiving surface 23 a of the light receiving sensor 23. In this embodiment, after the illumination light Lf emitted from the illumination light source 21 is reflected by the information code, the reflected light Lr is collected by the imaging lens 27 and a code image is formed on the light receiving surface 23a of the light receiving sensor 23. I am letting you image.

  The microcomputer system includes an amplification circuit 31, an A / D conversion circuit 33, a memory 35, an address generation circuit 36, a synchronization signal generation circuit 38, a control circuit 40, and the like. This microcomputer system is configured around a control circuit 40 and a memory 35 that can function as a microcomputer (information processing apparatus), and the image signal of the information code C imaged by the optical system described above is signaled in hardware and software. It can be processed.

  An image signal (analog signal) output from the light receiving sensor 23 of the optical system is input to the amplifier circuit 31, amplified by a predetermined gain by the amplifier circuit 31, and then input to the A / D conversion circuit 33, from the analog signal. Converted into a digital signal. The digitized image signal, that is, image data (image information) is input to the memory 35 and stored in the image data storage area of the memory 35. The synchronization signal generation circuit 38 is configured to generate a synchronization signal for the light receiving sensor 23 and the address generation circuit 36. The address generation circuit 36 is based on the synchronization signal supplied from the synchronization signal generation circuit 38. Thus, the storage address of the image data stored in the memory 35 can be generated.

  The memory 35 is configured by a known storage medium such as a semiconductor memory device, and corresponds to, for example, a RAM, a ROM, and other nonvolatile memories. In addition to the above-described image data storage area, the RAM of the memory 35 is configured to be able to secure a work area and a reading condition table that are used by the control circuit 40 in each processing such as arithmetic operation and logical operation. . Further, the ROM has a system capable of controlling each hardware such as the illumination light source 21 and the light receiving sensor 23, such as a program capable of executing a reading process for decoding the captured information code, a program capable of executing a call process, and the like. A program or the like is stored in advance so as to be controllable by the control circuit 40.

  The control circuit 40 includes a microcomputer that can control the mobile terminal 10 as a whole, and includes a CPU, a system bus, an input / output interface, and the like, and has an information processing function. Various input / output devices (peripheral devices) are connected to the control circuit 40 via a built-in input / output interface. In the configuration of FIG. 2, an operation unit 42, a liquid crystal display 43, a sound generation unit 44, A vibrator 45, a light emitting unit 46, a microphone 50, a communication interface 48, and the like are connected.

  The operation unit 42 includes a plurality of keys, and is configured to give an operation signal to the control circuit 40 in response to a user's key operation. When the control circuit 40 receives an operation signal from the operation unit 42 The operation is performed according to the operation signal. The liquid crystal display 43 is constituted by a known liquid crystal display panel, and the display content is controlled by the control circuit 40. The sound generation unit 44 is configured by a known speaker and is controlled by the control circuit 40 to function so as to output (sound) the voice, buzzer, or the like of the other party. Vibrator 45 is configured by a known vibrator mounted on a mobile terminal, and functions to generate vibration in accordance with a drive signal from control circuit 40. The light emitting unit 46 is, for example, an LED, and functions to light up and blink in response to a signal from the control circuit 40. The communication interface 48 is configured as an interface for performing data communication with the outside (for example, a host device), and functions to perform communication processing in cooperation with the control circuit 40.

  The microphone 50 is configured by a known microphone, and is controlled by the control circuit 40 to send an audio signal corresponding to the sound collected through the sound collecting surface 52 formed at the center of the upper surface 51 to the control circuit 40. Functions to output.

Next, the sound insulation structure in the vicinity of the microphone 50 and the microphone opening 13 will be described in detail with reference to FIGS.
As shown in FIG. 3, the microphone 50 is mounted on the keyboard substrate 20 and disposed so as to face the microphone opening 13 formed in the housing 11 on the sound collection surface 52. The microphone opening 13 is formed to be slightly larger than the sound collection surface 52. Inside the casing of the microphone opening 13, a waterproof sheet 60 that functions as a waterproof member is bonded and fixed with a double-sided tape 61 a so as to close the microphone opening 13.

  Between the microphone 50 and the waterproof sheet 60, a sound insulating portion 70 made of an elastic member such as solid rubber is provided. The sound insulation portion 70 has a substantially quadrangular prism shape, and is configured such that a circular through hole 73 penetrates from the upper end portion 71 to the lower end portion 72 at the center. The through hole 73 is formed so as to be larger than the microphone opening 13 and the sound collection surface 52 that are coaxially positioned. An annular stepped portion 74 that can be engaged with the upper portion of the microphone 50 is formed at the lower end portion 72. The sound insulating portion 70 is formed such that the length (height) from the upper end portion 71 to the bottom surface of the annular stepped portion 74 is slightly longer than the distance between the upper surface 51 of the microphone 50 and the lower surface of the waterproof sheet 60. ing.

  The sound insulation unit 70 configured in this manner is bonded and fixed to the waterproof sheet 60 and the microphone 50 using the double-sided tapes 61b and 61c. Specifically, the sound insulating portion 70 is double-sided with respect to the waterproof sheet 60 so as to enclose the region S where the microphone opening 13 is projected in the lower surface of the waterproof sheet 60 at the upper end portion 71 in an annular shape by the through hole 73. The tape 61b is adhesively fixed. In the present embodiment, the double-sided tape 61b that is interposed between the upper end portion 71 and the lower surface of the waterproof sheet 60 for bonding and fixing is arranged in an annular shape so as to surround the through hole 73 and the microphone opening 13. The lower surface of the waterproof sheet 60 may correspond to an example of “the surface of the waterproof member on the microphone side”.

  In addition, in the sound insulating portion 70, an annular stepped portion 74 at the lower end 72 is engaged with the upper portion of the microphone 50 so as to surround the sound collecting surface 52 annularly with the through hole 73. Is fixed to the upper surface 51 of the microphone 50 by a double-sided tape 61c provided on the microphone 50. In the present embodiment, the double-sided tape 61c that is interposed between the annular stepped portion 74 of the lower end portion 72 and the upper surface 51 of the microphone 50 for bonding and fixing has an annular shape so as to surround the through hole 73 and the sound collecting surface 52. Has been placed.

  In particular, the sound insulating portion 70 has a length (height) from the upper end portion 71 to the bottom surface of the annular stepped portion 74 slightly longer than the distance between the upper surface 51 of the microphone 50 and the lower surface of the waterproof sheet 60. Therefore, the sound insulation portion 70 is elastically deformed and pressed against the waterproof sheet 60 and the microphone 50 during assembly. Due to this elastic force, the sound insulating portion 70, the waterproof sheet 60 and the microphone 50 are brought into close contact with each other.

  In the mobile terminal 10 configured as described above, when the control circuit 40 executes the call process, the utterance sound transmitted through the microphone opening 13 and the waterproof sheet 60 into the through hole 73 of the sound insulating portion 70 (arrow F1 in FIG. 3). Is collected on the sound collecting surface 52 of the microphone 50. At this time, since the sound insulating portion 70 is bonded and fixed to the waterproof sheet 60 and the microphone 50, the uttered sound transmitted to the through hole 73 as described above is difficult to leak into the other housing space.

  On the other hand, an internal reverberation sound (see arrow F2 in FIG. 3) in the case 11 due to an external impact or the like, such as when the case 11 is struck or rubbed when executing a call process. ), It is possible to make it difficult to transmit the internal reverberation sound into the through hole 73 of the sound insulating portion 70.

  As described above, in the mobile terminal 10 according to the present embodiment, the microphone opening 13 that faces the sound collection surface 52 of the microphone 50 housed in the housing 11 is formed in the housing 11, and this microphone opening. A waterproof sheet 60 that covers 13 from the inside, and a sound insulation portion 70 that annularly surrounds the area S on which the microphone opening 13 of the waterproof sheet 60 is projected and the sound collection surface 52 and partitions the other interior space. Is provided.

  As a result, even when the waterproof sheet 60 is provided in the microphone opening 13 from the inside, the sound insulation portion 70 leaks an uttered sound or the like from the outside through the microphone opening 13 from between the waterproof sheet 60 and the sound collecting surface 52. Since it becomes difficult, the fall of a volume feeling and a clear feeling can be suppressed. And it becomes difficult for an internal reverberation sound to be collected through between the waterproof sheet 60 and the sound collection surface 52, and the influence of an internal reverberation sound can be suppressed. Therefore, both the waterproof property and the sound insulation property can be achieved for the microphone 50 provided in the housing 11.

  In particular, since the sound insulating part 70 is annularly bonded to the waterproof sheet 60 using the double-sided tape 61b, the sound insulating part 70 and the waterproof sheet 60 are brought into close contact with each other so that the sound hardly leaks. Can be further enhanced. In addition, the sound insulation part 70 and the waterproof sheet 60 are not limited to being bonded using the double-sided tape 61b, but may be annularly or partially bonded using another adhesive member such as an adhesive.

  Furthermore, since the sound insulation part 70 is bonded to the microphone 50 in a ring shape using the double-sided tape 61c, the sound insulation part 70 and the microphone 50 are brought into close contact with each other, so that the sound hardly leaks. Can be increased. In addition, the sound insulation part 70 and the microphone 50 are not limited to being bonded using the double-sided tape 61c, and may be annularly or partially bonded using another bonding member such as an adhesive.

  In addition, since the sound insulating part 70 is made of an elastic member such as solid rubber, the sound insulating part 70 is elastically deformed and pressed against the waterproof sheet 60 and the microphone 50 at the time of assembly. And since the microphone 50 is brought into close contact with the sound, it is difficult for the sound to leak, so that the sound insulation regarding the microphone 50 can be further improved.

[Second Embodiment]
Next, a mobile terminal according to a second embodiment of the present invention will be described with reference to FIG.
The second embodiment is mainly different from the first embodiment in that the microphone is assembled so as to be press-fitted into the sound insulating portion. For this reason, substantially the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 6, in this embodiment, a sound insulating part 70 b is employed instead of the above-described sound insulating part 70. An annular stepped portion 74 of the sound insulating portion 70b is formed by a cylindrical press-fit surface 74a that covers the outer peripheral surface 53 of the microphone 50 by being press-fitted from the sound collection surface side, and an upper surface 51 on which the sound collection surface 52 of the microphone 50 is provided. Of these, a bottom surface 74 b that is annularly in contact with the outer edge portion surrounding the sound collecting surface 52 is formed to be continuous at a right angle. In particular, the press-fitting surface 74 a is formed so as to be press-fitted to the outer peripheral surface 53 because its inner diameter is slightly smaller than the outer diameter of the outer peripheral surface 53 of the microphone 50. In the present embodiment, for example, the inner diameter of the press-fit surface 74a is set to φ3.9 mm, and the outer diameter of the outer peripheral surface 53 is set to φ4.0 mm.

  Further, the sound insulating portion 70b has a length (height) from the upper end portion 71 to the bottom surface 74b of the annular stepped portion 74 in order to improve adhesion between the bottom surface 74b and the outer edge portion of the upper surface 51 of the microphone 50 during assembly. However, it is formed to be slightly longer than the distance between the upper surface 51 of the microphone 50 and the lower surface of the waterproof sheet 60. The sound insulating portion 70b is formed to have a substantially cylindrical shape in order to increase the degree of freedom of the press-fitting position with respect to the microphone 50 in the rotation direction with the center of the through hole 73 as a reference.

  In the present embodiment, the microphone opening 13 provided in the housing 11 is formed so as to be smaller than the through hole 73 of the sound insulating portion 70b.

  The sound insulation portion 70b configured in this manner is pressed into the microphone 50 and then pressed against the waterproof sheet 60 covering the microphone opening 13 from the inside by the upper end portion 71, so that the assembled state shown in FIG. Become.

  More specifically, first, the sound insulating portion 70b is press-fitted into the microphone 50 mounted on the keyboard substrate 20 so as to cover the outer peripheral surface 53 of the microphone 50 with the press-fitting surface 74a of the annular stepped portion 74. The press-fitting is completed by pressing 74b until it contacts the outer edge of the upper surface 51 of the microphone 50. Thereafter, when assembling the lower case body 11b to which the keyboard substrate 20 or the like is assembled and the upper case body 11a to which the waterproof sheet 60 is bonded and fixed so as to close the microphone opening 13, the sound insulating portion 70b is connected to the upper end portion 71. Is pressed against the waterproof sheet 60, and the assembled state shown in FIG. 6 is obtained.

  In this assembled state, the sound insulating portion 70 b is press-fitted so as to cover the outer peripheral surface 53 of the microphone 50 with the press-fitting surface 74 a of the annular stepped portion 74. That is, since the sound insulating portion 70b includes a press-fit surface 74a that is press-fitted from the sound collecting surface side and covers the outer peripheral surface 53 of the microphone 50, the sound insulating portion 70b and the microphone 50 are brought into close contact with each other without using an adhesive or the like. Therefore, the sound insulation regarding the microphone 50 can be further enhanced.

  In particular, the sound insulating portion 70 b is press-fitted so as to cover the outer peripheral surface 53 of the microphone 50 with the press-fit surface 74 a of the annular stepped portion 74, and the bottom surface 74 b of the annular stepped portion 74 contacts the outer edge portion of the upper surface 51 of the microphone 50. It is pushed in until That is, the sound insulating portion 70b is an annular shape in which a bottom surface 74b that makes an annular contact with an outer edge portion surrounding the sound collecting surface 52 of the upper surface 51 provided with the sound collecting surface 52 of the microphone 50 and a press-fit surface 74a are connected. A step 74 is provided. Thereby, since the surface where the sound insulation part 70b and the microphone 50 closely_contact | adhere increases and it becomes difficult to leak a sound, the sound insulation regarding the microphone 50 can be improved further.

  Further, the sound insulating portion 70 b has a length (height) from the upper end portion 71 to the bottom surface 74 b of the annular stepped portion 74 slightly longer than the distance between the upper surface 51 of the microphone 50 and the lower surface of the waterproof sheet 60. Is formed. For this reason, the sound insulation portion 70b is elastically deformed and pressed against the waterproof sheet 60 and the microphone 50 at the time of assembly, and the elastic force causes the bottom surface 74b of the annular stepped portion 74 of the sound insulation portion 70b and the upper surface 51 of the microphone 50 to be pressed. By improving the adhesion with the outer edge, the sound insulation regarding the microphone 50 can be further enhanced.

  And by improving such adhesion, the double-sided tapes 61b and 61c described in the first embodiment are not necessary, so that the number of parts and assembly man-hours can be reduced, and the manufacturing cost can be reduced. Can be planned. Further, since the positional relationship between the sound insulating portion 70b and the microphone 50 is fixed, it is assembled as compared with the case where the sound insulating portion previously bonded to the upper case body 11a together with the waterproof sheet 60 is engaged with the microphone 50. In addition, it is possible to eliminate the positional shift of the sound insulating portion 70b with respect to the sound collecting surface 52, and it is possible to reliably prevent the sound insulating property from being lowered due to the positional shift of the sound insulating portion.

  The waterproof sheet 60 is attached to the upper case body 11a so as to close the microphone opening 13 when the lower case body 11b and the upper case body 11a are assembled after the waterproof sheet 60 is first bonded to the sound insulating portion 70b with a double-sided tape or the like. It may be assembled so as to be pressed.

In addition, this invention is not limited to said each embodiment, For example, you may actualize as follows.
(1) The sound insulating portion provided between the microphone 50 and the waterproof sheet 60 is attached to the microphone 50 so as to be engaged with the upper portion of the microphone 50 by the annular stepped portion 74 like the sound insulating portions 70 and 70b described above. The microphone 50 is not limited to being bonded and fixed to the microphone 50 by using a double-sided tape 61c between the upper surface 51 and the lower end portion 72a formed in a flat shape, for example, as in the sound insulating portion 70a illustrated in FIG. It may be bonded and fixed.

(2) The sound insulating portions 70 and 70 b are annularly surrounded by the through-hole 73 so that the region S on which the microphone opening 13 of the waterproof sheet 60 is projected and the sound collection surface 52 are separated from other spaces in the housing. Of the waterproof sheet 60 on the microphone 50 side (lower surface), and at least a part of the area where the microphone opening 13 is projected and the sound collection surface 52 are annularly surrounded by another housing. It may be formed so as to partition from the body space.

(3) The double-sided tape 61b and the sound insulation part 70 between the sound insulation part 70 and the waterproof sheet 60 are premised on the assumption that the sound insulation part 70 constituted by an elastic member is elastically deformed and pressed against the waterproof sheet 60 and the microphone 50. And at least one of the double-sided tape 61c between the microphones 50 may be excluded.

(4) The sound insulation portion is not limited to being constituted by an elastic member such as solid rubber, but is premised on bonding between the waterproof sheet 60 and the microphone 50 using the double-sided tape 61b, 61c or the like. Further, it may be composed of a low-elasticity member with improved sound insulation.

(5) The present invention is not limited to being applied to a portable terminal having an optical information reading function and a calling function as described above. For example, the present invention is not limited to a portable terminal having a wireless communication function or a calling function. The present invention can be applied to a portable terminal in which a microphone 50 (microphone) is accommodated in a casing, such as a portable terminal having a function.

(6) The lower end portion 72 of the sound insulating portion 70 is not limited to the annular stepped portion 74 formed to be engageable with the upper portion of the columnar microphone 50. For example, the microphone 50 is formed in a quadrangular prism shape or the like. In such a case, an annular stepped portion may be formed so as to be engageable with the outer shape. In order to improve sound insulation, the inner peripheral surface of the annular stepped portion and the outer peripheral surface of the microphone 50 may be bonded using an adhesive member such as a double-sided sheet or an adhesive.

DESCRIPTION OF SYMBOLS 10 ... Portable terminal 11 ... Housing 13 ... Microphone opening (opening)
50 ... Microphone
52 ... Sound collecting surface 60 ... Waterproof sheet (waterproof member)
61a-61c ... Double-sided tape 70, 70a, 70b ... Sound insulation part 74 ... Circular step (annular step)
74a ... Press-fit surface 74b ... Bottom surface

Claims (6)

A portable terminal in which a microphone is accommodated in a housing,
The casing is formed with an opening facing the sound collection surface of the microphone,
A waterproof member covering the opening from the inside;
A sound insulating portion that annularly surrounds at least a part of a region of the waterproof member on the microphone side where the opening is projected and the sound collection surface and divides the space from another housing space;
A portable terminal comprising:   The mobile terminal according to claim 1, wherein the sound insulation unit is bonded in an annular shape to the waterproof member.   The mobile terminal according to claim 1, wherein the sound insulating unit is bonded in an annular shape to the microphone.   The mobile terminal according to any one of claims 1 to 3, wherein the sound insulation unit is configured by an elastic member.   The portable terminal according to any one of claims 1 to 4, wherein the sound insulating portion includes a press-fitting surface that is press-fitted from a sound collecting surface side and covers an outer peripheral surface of the microphone.   The sound insulation portion includes an annular step portion in which a surface that annularly contacts an outer edge portion surrounding the sound collection surface of the surface of the microphone on which the sound collection surface is provided and the press-fitting surface are connected. The mobile terminal according to claim 5, wherein

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