JP6663106B2 - Acoustic component, electronic device, and method for manufacturing acoustic component - Google Patents

Description

  The present invention relates to an acoustic component, an electronic device, and a method for manufacturing an acoustic component.

  2. Description of the Related Art Conventionally, in an electronic device in which a microphone element (hereinafter, referred to as a “microphone element”) and a speaker unit are incorporated, a sound path is formed as a space through which sound passes using a cover or the like that forms a housing of the electronic device. May be done. By placing a sponge-like material or a sound-absorbing material using a porous elastic material in such a sound path, the sound-absorbing material absorbs the sound of a specific frequency and passes only the sound of the required frequency. Let it be done. As a technique using a porous elastic body to obtain a desired frequency characteristic, for example, Patent Document 1 is known.

JP 2006-50174 A

  By the way, a sponge-like material used for a sound-absorbing material for reducing a specific frequency generally has a high flexibility and may cause a positional shift when assembling an electronic device. Also, materials such as sponges, even after the completion of the assembly of the electronic device, it is difficult to maintain an appropriate position and posture, such as moving within the housing of the electronic device, causing a change in posture, etc. Conceivable. Unless the sound absorbing material is properly arranged with respect to acoustic components such as a microphone element and a speaker, it is considered difficult to obtain a desired acoustic effect.

  In one aspect, an acoustic component, an electronic device, and a method for manufacturing an acoustic component disclosed in this specification have an object to appropriately reduce a specific frequency.

The acoustic component disclosed in the present specification includes a sheet-shaped first member and a first opening , and has a substantially polygonal shape in which one corner is different in shape from another corner . a second member member is bonded, with the previous SL includes a housing portion communicating with the first opening, and a third member which back surface of the first member is bonded surface of the second member is bonded , and communicates with the front Symbol housing portion, provided with a small second opening than the opening dimension of the housing portion, the back surface of said second member are bonded together face of the third member is bonded, cushioning And a sound absorbing material formed of a sponge-like material and housed in the housing portion in a compressed state, wherein the third member of the four-layer member is the first member The second member and the fourth member are thicker than the thickness of the fourth member. Ru is formed by Nji like material.

An electronic device disclosed in the present specification includes a housing provided with a plurality of sound holes, a board disposed in the housing, and a plurality of boards mounted at positions corresponding to the positions of the plurality of sound holes on the board. The microphone element, comprising a plurality of acoustic components arranged in the housing for each of the plurality of microphone elements, the acoustic components each include a sheet-shaped first member, and a first opening, the shape of one corner is substantially polygonal shape different from the other corners of the shape, and a second member to which the first member is bonded, with the previous SL includes a housing portion communicating with the first opening, a third member back surface of the first member is bonded surface of the second member is bonded, and communicates with the front Symbol housing portion, provided with a small second opening than the opening dimension of the housing portion Back surface of the surface of the third member to which the second member is attached A fourth member having a cushioning property, and a sound absorbing material formed of a sponge-like material and stored in the storage portion in a compressed state, wherein the third member of the four-layer member is provided . member, said first member, said second member, Ru is formed by a thick spongy material than the thickness of said fourth member.

The method for manufacturing an acoustic component disclosed in this specification provides a sheet-like first member, a second member having a first opening, a third member having a storage portion, and a fourth member having a second opening. A sound component comprising a sound absorbing material formed of a sponge-like material and housed in the housing portion in a compressed state, wherein the second member is formed and one corner is formed. a step of providing a pre-Symbol first opening to the second material shape parts is substantially polygonal shape different from the other corners of the shape, wherein the first opening to the third material forming a third member Providing the accommodating portion communicating with the accommodating portion, and providing the second opening smaller than the opening dimension of the accommodating portion to communicate with the accommodating portion in a cushioning fourth material forming the fourth member. a step, a first material that forms said first member, said first opening is formed A step of overlapping and adhering the second material, a second material wherein the first opening is provided, a step of overlapping and adhering a third material the storage unit is provided, the housing portion A step of overlapping and bonding the provided third material and the fourth material provided with the second opening, and forming the external shape of the acoustic component from the bonded first material to the fourth material. Cutting out the case member along the shape, and pressing the sound absorbing material into the storage portion of the case member while compressing the same through the second opening provided in the fourth member, and storing the compressed sound absorbing material. wherein the third member of the four-layer member, said first member, said second member, Ru is formed by a thick spongy material than the thickness of said fourth member.

  According to the acoustic component, the electronic device, and the method for manufacturing an acoustic component disclosed in this specification, the specific frequency can be appropriately reduced.

FIG. 1 is a perspective view of an electronic device on which the acoustic component of the embodiment is mounted. FIG. 2A is a front view of an electronic device on which the acoustic component of the embodiment is mounted, and FIG. 2B is a cross-sectional view taken along line AA in FIG. 2A. FIG. 3 is a perspective view of a front cover forming a housing of the electronic device as viewed from a side inside the electronic device. FIG. 4 is a perspective view showing a state where an acoustic component is mounted on the front cover. FIG. 5 is a perspective view showing the acoustic component of the embodiment. 6A and 6B are four views of the acoustic component, FIG. 6A is a front view, FIG. 6B is a side view, FIG. 6C is a rear view, and FIG. 6D is a bottom view. FIG. 7 is an exploded perspective view of the acoustic component of the embodiment. 8A and 8B are three views of the first member, FIG. 8A is a front view, FIG. 8B is a side view, and FIG. 8C is a rear view. 9A and 9B are three views of the second member, FIG. 9A is a front view, FIG. 9B is a side view, and FIG. 9C is a rear view. 10 is a three-sided view of the third member, FIG. 10 (A) is a front view, FIG. 10 (B) is a side view, and FIG. 10 (C) is a rear view. 11A and 11B are three views of the fourth member, FIG. 11A is a front view, FIG. 11B is a side view, and FIG. 11C is a rear view. 12 is a three-sided view of the sound absorbing material, FIG. 12 (A) is a front view, FIG. 12 (B) is a side view, and FIG. 12 (C) is a plan view. FIG. 13 is a graph showing the sound absorbing characteristics of the sound absorbing material. FIG. 14 is an explanatory diagram showing an arrangement of members constituting an acoustic component. FIG. 15 is an explanatory diagram schematically showing a part of the manufacturing process of the acoustic component. FIG. 16A shows a state in which the materials of the members constituting the acoustic component are overlapped and bonded by bonding, and FIG. 16B is a case member cut out of the bonded material according to the external shape of the acoustic component. FIG. FIG. 17 is an explanatory diagram showing a state in which the sound absorbing material is pushed into the case member. FIG. 18 is an explanatory view of the front cover on which the first to third buttons and the sound component are mounted, as viewed from the inside of the electronic device. FIG. 19A is an explanatory diagram of a substrate included in the electronic device as viewed from one surface side, and FIG. 19B is an explanatory diagram of a substrate included in the electronic device as viewed from another surface side. FIG. 20 is an explanatory diagram of the front cover on which the substrate is mounted, as viewed from the inside of the electronic device. FIG. 21 is an explanatory diagram showing a cross section of the electronic device along a line corresponding to line BB in FIG. FIG. 22 is an explanatory view showing a state where the substrate is screwed to the front cover. FIG. 23A is a schematic diagram illustrating a state of the acoustic component before the substrate is screwed, and FIG. 23B is a schematic diagram illustrating a state where the substrate is screwed and the substrate adheres to the acoustic component. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, in the drawings, dimensions, ratios, and the like of each part may not be illustrated so as to completely match actual ones. In addition, depending on the drawings, constituent elements that actually exist may be omitted, or the dimensions may be exaggerated rather than actual, for the sake of explanation.

(Embodiment)
First, a schematic configuration of an electronic device 1 of the present embodiment and an acoustic component 20 mounted on the electronic device 1 will be described with reference to FIGS. FIG. 1 is a perspective view of an electronic device on which the acoustic component of the embodiment is mounted. FIG. 2A is a front view of an electronic device on which the acoustic component of the embodiment is mounted, and FIG. 2B is a cross-sectional view taken along line AA in FIG. 2A. FIG. 3 is a perspective view of a front cover forming a housing of the electronic device as viewed from a side inside the electronic device. FIG. 4 is a perspective view showing a state where an acoustic component is mounted on the front cover. In the following description, the front side and the back side of the electronic device 1 are set as shown in FIGS.

  Referring to FIGS. 1, 2A and 2B, the electronic device 1 is, for example, a device that is installed on a wall surface, a pillar, or the like in a room and monitors the state of an elderly person or the like. The elderly and the like can communicate with remote family members, medical workers, caregivers, and the like via the electronic device 1. You can know how it is. The electronic device 1 is configured to be able to communicate with the outside via the Internet or the like. The electronic device 1 includes a housing 2 configured by combining a front cover 2a and a rear cover 2b. A camera 3 is provided on the front surface of the front cover 2a so as to capture an image of a room in which the electronic device 1 is installed. A plurality of first openings 2a1 serving as sound holes are provided in the front cover 2a, and the acoustic component 20 is exposed from each of the first openings 2a1. A substrate 30 is disposed in the housing 2 of the electronic device 1. The microphone element 31 is mounted on the substrate 30 at a position corresponding to the positions of the plurality of first openings 2a1 provided on the front cover 2a. The acoustic component 20 is provided for each microphone element 31 mounted on the substrate 30. The acoustic component 20 will be described later in detail. The front cover 2a is provided with a motion sensor 7, a speaker 5, and an operation lamp 7 indicating the operation status of the electronic device 1. In the present embodiment, three microphone elements 31 are provided, and three acoustic components 20 are also provided. However, the numbers of the microphone elements 31 and the acoustic components 20 are not limited thereto.

  Referring to FIG. 3, the front cover 2a is provided with a second opening 2a2, a third opening 2a3, a fourth opening 2a4, and a fifth opening 2a5. A first button 6a for operating the electronic device 1 is mounted in the second opening 2a2. The first button 6a is a stop button for terminating a call state or the like of the electronic device 1. A second button 6b for operating the electronic device 1 is mounted in the third opening 2a3. The second button 6b is a call start button for a user to make a call through the electronic device 1. A third button 6c for operating the electronic device 1 is mounted in the fourth opening 2a4. The third button 6c is a button used in an emergency. When the third button 6c is operated, the third button 6c is immediately transmitted to the outside to notify the user of an emergency. When an emergency occurs, it is assumed that the user will be in a hurry and it will be difficult to operate the buttons. Therefore, the third button 6c is larger than the first button 6a and the second button 6b, and has a shape and structure that can cope with pressing operations from multiple directions, such as forward and upward of the front cover 2a. Have. The human sensor 4 is mounted in the fifth opening 2a5.

  The same number of acoustic component mounting portions 8 as the number of microphone elements 31 are formed on the side of the front side cover 2a inside the housing 2. The acoustic component mounting sections 8 are each surrounded by a wall section 8a. The acoustic component mounting section 8 has a shape corresponding to the outer shape of the acoustic component 20 described in detail later. Around the acoustic component mounting section 8, a screw receiving section 9 for fixing the substrate 30 to the front cover 2a is provided. The front cover 2a is provided with a positioning projection 10 for easily positioning the substrate 30 when the substrate 30 is attached to the front cover 2a. The positioning protrusions 10 are provided on both side edges of the front cover 2a. Referring to FIG. 4, the acoustic component 20 is mounted on the acoustic component mounting section 8 provided on the front cover 2a.

  Here, the acoustic component 20 will be described in detail with reference to FIGS. FIG. 5 is a perspective view showing the acoustic component of the embodiment. 6A and 6B are four views of the acoustic component, FIG. 6A is a front view, FIG. 6B is a side view, FIG. 6C is a rear view, and FIG. 6D is a bottom view. FIG. 7 is an exploded perspective view of the acoustic component of the embodiment. 8A and 8B are three views of the first member, FIG. 8A is a front view, FIG. 8B is a side view, and FIG. 8C is a rear view. 9A and 9B are three views of the second member, FIG. 9A is a front view, FIG. 9B is a side view, and FIG. 9C is a rear view. 10 is a three-sided view of the third member, FIG. 10 (A) is a front view, FIG. 10 (B) is a side view, and FIG. 10 (C) is a rear view. 11A and 11B are three views of the fourth member, FIG. 11A is a front view, FIG. 11B is a side view, and FIG. 11C is a rear view. 12 is a three-sided view of the sound absorbing material, FIG. 12 (A) is a front view, FIG. 12 (B) is a side view, and FIG. 12 (C) is a plan view. FIG. 13 is a graph showing the sound absorbing characteristics of the sound absorbing material. FIG. 14 is an explanatory diagram showing an arrangement of members constituting an acoustic component. In the following description, the XYZ directions are set as shown in FIG. The direction along the Z direction corresponds to the direction from the front side to the back side of the electronic device 1.

  Referring to FIGS. 5 to 7, the acoustic component 20 includes a first member 21, a second member 22 having an opening 221, a third member 23 having a storage portion 231, and a fourth member having an opening 241. 24. The acoustic component 20 further includes a sound absorbing material 25 formed of a sponge-like material and housed in the housing 231 in a compressed state. The external shape of the acoustic component 20 is substantially rectangular, and one of the four corners is different in shape from the other three corners. That is, the acoustic component 20 includes a first corner 20a, a second corner 20b, a third corner 20c, and a fourth corner 20d, and among these corners, the first corner 20a is rounded. The other corners 20b to 20d are largely chamfered. Such a shape is used in order to correctly mount the acoustic component 20 on the acoustic component mounting section 8. The mounting of the acoustic component 20 to the acoustic component mounting section 8 will be described later in detail. In FIG. 7, the double-sided tape for bonding the members is omitted.

  The external dimension along the X direction of the acoustic component 20 is set to X20, and the external dimension along the Y direction is set to Y20. The external dimension of the acoustic component 20 along the Z direction, that is, the thickness of the acoustic component 20 is set to Z20.

  8A to 8C, the first member 21 is a sheet-shaped member having a thickness Z21. The first member 21 is formed of a nonwoven fabric. The outer shape of the first member 21 is a substantially rectangular shape that matches the outer shape of the acoustic component 20, the outer size in the X direction is set to X21, and the outer size in the Y direction is set to Y21. Therefore, the dimension X21 matches the dimension X20, and the dimension Y21 matches the dimension Y20. The outer shape of the first member 21 includes a first corner 21a, a second corner 21b, a third corner 21c, and a fourth corner 21d. The first to fourth corners 21a to 21d match the shapes of the first to fourth corners 20a to 20d of the acoustic component 20, respectively.

  Referring to FIG. 8A, one surface side of the first member 21 is partitioned into a rectangular first region 211 at the center and a second region 212 around the first region. In FIG. 8A, a second area 212 indicated by hatching is an area to which the first double-sided tape 26 is attached. The first double-sided tape 26 is used for bonding the acoustic component 20 to the inner peripheral wall surface of the front cover 2a. A commercially available product can be used for the first double-sided tape 26. The first double-sided tape 26 in the present embodiment is No. 1 manufactured by Nitto Denko Corporation. 5000 NS is used. The first area 211 is an area through which the sound passing through the first opening 2a1 provided in the front cover 2a passes. The dimension in the X direction of the first area 211 is set to X211 and the dimension in the Y direction is set to Y211. The first member 21 prevents the foreign matter from entering the housing 2 and places the sound absorbing material 25 in the storage portion 231 so that the sound absorbing material 25 does not jump out of the housing 2 through the first opening 2a1. Keep it. Further, the first member 21 contributes to improving the quality of the external design of the electronic device 1.

  As the first member 21, a commercially available nonwoven fabric can be used. In the present embodiment, Himeron HN604B manufactured by AMBIC Corporation is used. Since Himeron HN604B has a thickness of 0.25 mm, Z21 in the present embodiment is 0.25 mm.

  Referring to FIGS. 9A to 9C, the second member 22 is a member having a thickness Z22. The second member 22 of the present embodiment is formed of PET (Polyethylene terephthalate) which is harder than the third member 23 and the fourth member 24. The outer shape of the second member 22 is a substantially rectangular shape that matches the outer shape of the acoustic component 20, the outer size in the X direction is set to X22, and the outer size in the Y direction is set to Y22. Therefore, the dimension X22 matches the dimension X20, and the dimension Y22 matches the dimension Y20. The outer shape of the second member 22 includes a first corner 22a, a second corner 22b, a third corner 22c, and a fourth corner 22d. The first to fourth corners 22a to 22d match the shapes of the first to fourth corners 20a to 20d of the acoustic component 20, respectively. The second member 22 has a substantially rectangular opening 221. The dimension in the X direction of the opening 221 is set to X221, and the dimension in the Y direction is set to Y221. The dimension X221 matches the dimension X211 of the first region 211 of the first member 21, and the dimension Y221 matches the dimension Y211. The opening 221 is provided so that sound passing through the first opening 2a1 is not blocked.

  Referring to FIG. 9A, the second member 22 has a second double-sided tape 27 attached to a region indicated by hatching around the opening 221. The first member 21 is adhered to the second member 22 via the second double-sided tape 27 and bonded. A commercially available product can be used for the second double-sided tape 27. In the present embodiment, No. 2 manufactured by Nitto Denko Corporation is used as the second double-sided tape 27. 5000 NS is adopted.

  The second member 22 is hardly deformed by being molded from PET. The outer shape of the acoustic component 20 is less likely to be deformed because the second member 22 is laminated. The mounting posture of the acoustic component 20 is defined for the acoustic component 20 by making the shape of the first corner 20a different from the shapes of the other second to fourth corners 20b to 20d. Assuming that the entire acoustic component 20 is flexible and can be easily deformed, the acoustic component 20 may be mounted on the acoustic component mounting section 8 in a wrong direction. Therefore, the second member 22 is formed of a material that is not easily deformed, and the shape of the second component 22 is maintained to prevent deformation of the external shape of the acoustic component 20, and the acoustic component 20 is oriented in the correct direction. Can be attached to In the present embodiment, the outer shape of the second member 22 is a substantially rectangular shape in which the shape of one corner is different from the shape of the other corner, but the second member 22 has the shape of one corner. It may be a substantially polygonal shape different from the shape of the other corners.

Referring to FIGS. 10A to 10C, the third member 23 is a member having a thickness Z23. The thickness Z23 is larger than the thicknesses of the first member 21, the second member 22, and the fourth member 24. That is, it is the thickest of the four-layer members. By setting the thickness of the third member 23 in this way, it becomes possible to form a storage section 231 described later in the third member 23. The third member 23 is formed of a sponge-like soft material. A commercially available material can be used for the third member 23, and in this embodiment, PORON LE-20 (4 mm thick) manufactured by Rogers INOAC Co., Ltd. is used. The density of PORON LE-20 is 200 kg / m ³ , tensile strength 0.30 MPa, elongation 150%, tear strength 1.3 N / mm, 25% compression load 0.02, and compression residual strain 7.9%.

  The outer shape of the third member 23 is a substantially rectangular shape that matches the outer shape of the acoustic component 20, the outer size in the X direction is set to X23, and the outer size in the Y direction is set to Y23. Therefore, the dimension X23 matches the dimension X20, and the dimension Y23 matches the dimension Y20. The outer shape of the third member 23 includes a first corner 23a, a second corner 23b, a third corner 23c, and a fourth corner 23d. The first to fourth corners 23a to 23d match the shapes of the first to fourth corners 20a to 20d of the acoustic component 20, respectively. The third member 23 is provided with a substantially rectangular storage portion 231. The dimension in the X direction of the storage portion 231 is set to X231, and the dimension in the Y direction is set to Y231. The dimension X231 matches the dimension X221 of the opening 221 in the second member 22, and the dimension Y231 matches the dimension Y221. The dimension X231 and the dimension Y231 are the dimensions of the opening of the storage unit 231. The depth of the storage portion 231 matches the thickness Z23 of the third member 23, and is 4 mm in the present embodiment. The sound absorbing material 25 is stored in the storage part 231 in a compressed state.

  Referring to FIG. 10A, the third member 23 has a third double-sided tape 28 attached to a region indicated by hatching around the storage portion 231. The back surface of the surface of the second member 22 to which the first member 21 is adhered is adhered to the third member 23 via a third double-sided tape 28 and is adhered. Referring to FIG. 10B, a fourth double-sided tape 29 is attached to the third member 23 in a region indicated by hatching around the storage portion 231. The fourth double-sided tape 29 is used for bonding the third member 23 and the fourth member 24 by bonding. A commercially available product can be used for the third double-sided tape 28 and the fourth double-sided tape 29. In the present embodiment, No. 9 manufactured by Nitto Denko Corporation is used. 5000 NS is adopted. When the third member 23 is bonded to the second member 22, the storage unit 231 communicates with the opening 221.

  The microphone element 31 is provided in the housing 3. For this reason, it is necessary to prevent the sound reverberating in the housing 2 from wrapping around the microphone element 31. The third member 23 prevents such sound from wrapping around the microphone element 31. Since the electronic device 1 of the present embodiment includes a plurality of microphone elements 31, it is required that each of the microphone elements 31 prevents sound from flowing around. Since the third member 23 is provided in each of the acoustic components 20 provided for each of the microphone elements 31, it is possible to prevent the sound from wrapping around for each of the microphone elements 31.

Referring to FIGS. 11A to 11C, the fourth member 24 is a member having a thickness Z24. The fourth member 24 is formed using a sponge-like material. As a material of the fourth member 24, a material that is harder than the third member 23 and softer than the second member 22 is selected. The fourth member is a member that contacts the surface of the substrate 30 in the electronic device 1. As the material of the fourth member 24, a material having an appropriate cushioning property capable of closely adhering to the substrate 30 without any gap is selected. In selecting the material of the fourth member 24, it is also considered that the fourth member 24 has such a strength that the fourth member 24 does not rise due to the elastic force of the sound absorbing material 25 stored in the storage portion 231. A commercially available material can be used for such a fourth member 24, and in this embodiment, PORON H-48 (1 mm thick) manufactured by Rogers Inoac Corporation is used. The density of PORON H-48 is 480 kg / m ³ , tensile strength 2.35 MPa, elongation 140%, tear strength 6.2 N / mm, 25% compression load 0.25, and compression residual strain 3.9%.

  The outer shape of the fourth member 24 is a substantially rectangular shape that matches the outer shape of the acoustic component 20, and the outer size in the X direction is set to X24, and the outer size in the Y direction is set to Y24. Therefore, the dimension X24 matches the dimension X20, and the dimension Y24 matches the dimension Y20. The outer shape of the fourth member 24 includes a first corner 24a, a second corner 24b, a third corner 24c, and a fourth corner 24d. The first to fourth corners 24a to 24d match the shapes of the first to fourth corners 20a to 20d of the acoustic component 20, respectively. The fourth member 24 is provided with a substantially rectangular opening 241 communicating with the storage portion 231. The dimension in the X direction of the opening 241 is set to X241, and the dimension in the Y direction is set to Y241. Here, the size of the opening 241 is smaller than at least the size of the opening of the storage portion 231. That is, the dimension X241 is smaller than the dimension X231 of the storage section 231 in the third member 23, and the dimension Y241 is smaller than the dimension Y231. The opening 241 of the fourth member 24 is provided for embedding the microphone element 31 in the sound absorbing material 25. Therefore, the size of the opening 241 is larger than the outer size of the microphone element 31. However, the size of the opening 241 is set smaller than the size of the opening of the storage 231 so that the sound absorbing material 25 stored in the storage 231 does not fall off.

  The back surface of the surface of the third member 23 to which the second member 22 is bonded is bonded to the fourth member. Specifically, the third member 23 and the fourth member 24 are bonded to each other with the fourth double-sided tape 29 interposed therebetween.

  Referring to FIGS. 12A to 12C, the sound absorbing material 25 is a rectangular parallelepiped member. The sound absorbing material 25 is formed of a sponge-like material, and is stored in the storage portion 231 in a compressed state. The reason why the sound absorbing material 25 is stored in the storage portion 231 in a compressed state is to allow the sound absorbing material 25 to spread without any gap in the storage portion 231 by its elastic force. For this reason, the shape of the sound absorbing material 25 does not necessarily have to be a rectangular parallelepiped, and it is sufficient that the sound absorbing material 25 has a volume and a shape that can fill the inside of the storage portion 231 without a gap. It is desirable that the sound absorbing material 25 also enters the opening 221 communicating with the storage portion 231 and does not form a gap.

  The dimension in the X direction of the sound absorbing material 25 of the present embodiment is set to X25, and the dimension in the Y direction is set to Y25. The dimension in the Z direction, that is, the thickness is set to Z25. Here, the dimensions X25, Y25 and Z25 are dimensions when the sound absorbing material 25 is not compressed. In the present embodiment, the dimension X25 is the same as the dimension X231 of the storage section 231, but may be slightly larger than the dimension X231. The dimension Y25 is the same as the dimension Y231 of the storage section 231, but may be slightly larger than the dimension Y231. The dimension Z25 is set to be larger than the dimension Z231 of the storage section 231. As a result, the sound absorbing material 25 is held in a compressed state in the storage portion 231. Thereby, the sound absorbing material 25 can maintain a stable posture.

  The sound absorbing material 25 reduces the specific frequency. A commercially available material can be used as the sound absorbing material 25. In the present embodiment, Calmflex F-2 manufactured by Inoac Corporation is used. In the present embodiment, the dimension Z25 is set to 10 mm. Here, the sound absorbing characteristics of the sound absorbing material 25 will be described with reference to FIG. The horizontal axis of the graph shown in FIG. 13 represents the frequency [Hz], and the vertical axis represents the sound absorption coefficient. It can be seen that the higher the frequency of the sound absorbing material 25, the higher the sound absorbing coefficient. Therefore, the sound that has passed through the sound absorbing material 25 is reduced as the frequency of the sound increases, and the sound of the low frequency is transmitted well. As described above, the sound absorbing material 25 functions effectively when a high frequency is set to a specific frequency to be reduced. The sound absorbing material 25 has a sound absorbing characteristic that changes in accordance with the thickness, that is, the Z-direction dimension that is a dimension in a direction orthogonal to the direction in which sound travels. Therefore, the dimension in the Z direction can be appropriately set according to the specific frequency to be reduced. The sound absorbing characteristics are evaluated based on the dimension in the Z direction in a state where the sound absorbing material is not compressed. In the use state, even if the size in the Z direction of the sound absorbing material is compressed, the sound absorbing characteristics do not change. Therefore, although the sound absorbing material 25 in the present embodiment is stored in the storage portion 231 in a state where the dimension in the Z direction is compressed, it is possible to obtain the same sound absorbing characteristics as when the dimension in the Z direction is not compressed. it can.

  As described above, each component of the acoustic component 20 has been described individually. However, in order to facilitate understanding of the configuration of the acoustic component 20, an arrangement of each component will be described with reference to FIG. A first double-sided tape 26 is disposed on the most front side of each component constituting the acoustic component 20. Then, the first member 21, the second double-sided tape 27, the second member 22, the third double-sided tape 28, the third member 23, the fourth double-sided tape 29, and the fourth member 24 are arranged from the front side to the rear side. Have been. Then, the sound absorbing material 25 is stored in a compressed state in the storage portion 231. In this embodiment, a double-sided tape is used for bonding the members, but an adhesive may be used instead of the double-sided tape.

  Next, an example of a method for manufacturing the acoustic component 20 will be described with reference to FIGS. FIG. 15 is an explanatory diagram schematically showing a part of the manufacturing process of the acoustic component. FIG. 16A shows a state in which the materials of the members constituting the acoustic component are overlapped and bonded by bonding, and FIG. 16B is a case member cut out of the bonded material according to the external shape of the acoustic component. FIG. FIG. 17 is an explanatory diagram showing a state in which the sound absorbing material is pushed into the case member.

  First, a first material 210 from which the first member 21 is cut out, a second material 220 from which the second member 22 is cut out, a third material 230 from which the third member 23 is cut out, and a fourth material 240 from which the fourth member 24 is cut out Prepare The first material 210 is Himeron HN604B having a size larger than the outer dimensions of the final acoustic component 20. The second material 220 is a PTE plate having a size larger than the outer dimensions of the final acoustic component 20. The third material 230 is PORON LE-20 having a size larger than the outer dimensions of the final acoustic component 20. The fourth material 240 is PORON H-48 having a size larger than the outer dimensions of the final acoustic component 20. Also, a material 260 for the first double-sided tape 26, a material 270 for the second double-sided tape 27, a material 280 for the third double-sided tape 28, and a material 290 for the fourth double-sided tape 29 are prepared in the same manner.

  The sound absorbing material 25 is prepared by cutting the Calmflex F-2, which is the material of the sound absorbing material 25, into a predetermined shape, that is, dimensions X25, Y25, and Z25. Note that the cutout of the sound absorbing material 25 may be completed before the sound absorbing material 25 is finally pushed into the storage portion 231.

  Before each material is bonded, an opening and a storage portion provided in each member are formed. That is, the opening 221 is provided in the second material 220 forming the second member 22. Further, a storage part 231 is provided in the third material 230 forming the third member 23. Further, an opening 241 is provided in the fourth material 240 forming the fourth member 24. These steps are not particularly limited in order, and may be performed sequentially or may be performed in parallel if they are completed before the respective materials are bonded. Predetermined openings are provided in the material 260 of the first double-sided tape 26, the material 270 of the second double-sided tape 27, the material 280 of the third double-sided tape 28, and the material 290 of the fourth double-sided tape 29, respectively.

  When the formation of the opening and the storage portion provided in each member is completed, the first material 210 forming the first member 21 and the second material 220 provided with the opening 221 are overlapped and bonded. The bonding between the first material 210 and the second material 220 is performed by the material 270 of the second double-sided tape 27. Further, the second material 220 provided with the opening 221 and the third material 230 provided with the storage portion 231 are overlapped and bonded. The adhesion between the second material 220 and the third material 230 is performed by the material 280 of the third double-sided tape 28. Further, the third material 230 provided with the storage portion 231 and the fourth material 240 provided with the opening 241 are overlapped and bonded. Adhesion between the third material 230 and the fourth material 240 is performed by the material 290 of the fourth double-sided tape 29. The order in which the materials are bonded does not matter. It should be noted that a virtual outline 210 a that is the final outer shape of the acoustic component 20 is set in the first material 210. Similarly, a virtual outline 220 a is set in the second material 220. Further, a virtual outline 230a is set in the third material 230, and a virtual outline 240a is set in the fourth material 240.

  As shown in FIG. 16 (A), after the respective materials are superimposed and bonded, as shown in FIG. 16 (B), the sound component 20 is removed from the first to fourth materials 210 to 240 in the bonded state. The case member 200 is cut out along the outer shape. The case member 200 is cut out, for example, by punching.

  As shown in FIG. 17, after the case member 200 is cut out, the sound absorbing material 25 prepared in advance is compressed into the storage portion 231 of the case member 200 through the opening 241 provided in the fourth member 24. Push in and store. Thereby, the acoustic component 20 is completed.

  Next, attachment of the acoustic component 20 to the front cover 2a and attachment of the board 30 will be described with reference to FIGS. FIG. 18 is an explanatory view of the front cover on which the first to third buttons and the sound component are mounted, as viewed from the inside of the electronic device. FIG. 19A is an explanatory diagram of a substrate included in the electronic device as viewed from one surface side, and FIG. 19B is an explanatory diagram of a substrate included in the electronic device as viewed from another surface side. FIG. 20 is an explanatory diagram of the front cover on which the substrate is mounted, as viewed from the inside of the electronic device. FIG. 21 is an explanatory diagram showing a cross section of the electronic device along a line corresponding to line BB in FIG. FIG. 22 is an explanatory view showing a state where the substrate is screwed to the front cover. FIG. 23A is a schematic diagram illustrating a state of the acoustic component before the substrate is screwed, and FIG. 23B is a schematic diagram illustrating a state where the substrate is screwed and the substrate adheres to the acoustic component. FIG.

  Referring to FIG. 18, a first button 6a, a second button 6b, and a third button 6c are mounted on the front cover 2a. The acoustic component 20 is mounted on the front cover 2a. Then, the substrate 30 shown in FIGS. 19A and 19B is attached to the front cover 2a with the acoustic component 20 attached. A microphone element 31, a first switch element 32a, a second switch element 32b, and a third switch element 32c are mounted on the substrate 30. The first switch element 32a is pressed by the user via the first button 6a. The second switch element 32b is pressed by the user via the second button 6b. The third switch element 32c is pressed through the third button 6c. In addition, since the third button 6c is large, two third switch elements 32c are provided correspondingly. The two third switch elements 32c emit the same signal regardless of which is pressed.

  When attaching the substrate 30 to the front cover 2a, the positioning protrusion 10 is inserted into the positioning hole 30a provided in the substrate 30, as shown in FIGS. As a result, the substrate 30 is positioned in the planar direction.

  The substrate 30 is fixed to the front cover 2a by tightening the screws 33 in the screw receiving portions 9 as shown in FIG. 22 in a state where the positioning protrusions 10 are inserted through the positioning holes 30a. At this time, the substrate 30 abuts on the fourth member 24 of the acoustic component 20 and compresses the fourth member 24 appropriately. Thereby, the fourth member 24 and the surface of the substrate 30 are in close contact with each other, and the generation of a gap between the acoustic component 20 and the substrate 30 is avoided.

  Here, the relationship between the edge position of the wall 8a, the edge position of the screw receiving portion 9, and the edge position of the acoustic component 20 will be described with reference to FIGS. The edge position of the screw receiving portion 9 is higher than the edge position of the wall portion 8a in FIG. Further, the edge position of the acoustic component 20 before the substrate 30 is screwed is higher than the edge position of the screw receiving portion 9 in FIG. From this state, when the substrate 30 is screwed to the screw receiving portion 9 with the screw 33 as shown in FIG. 23B, the surface of the substrate 30 moves to a position where it comes into contact with the screw receiving portion 9. At this time, the acoustic component 20 comes into contact with the substrate 30 and is pressed to be in a compressed state. The fourth member 24 is in contact with the substrate 30 in the acoustic component 20. The fourth member 24 tends to return to its original shape due to its cushioning property, and thus can improve the adhesion to the substrate 30. As a result, generation of a gap between the acoustic component 20 and the substrate 30 is avoided.

  The sound absorbing material 25 for reducing the specific frequency is housed in the housing 231 in a compressed state. Thereby, the movement of the sound absorbing material 25 is suppressed, and the effect of reducing the specific frequency is easily exhibited. The acoustic component 20 is housed in the acoustic component mounting portion 8 in the housing 2 and installed in a state sandwiched between the front cover 2 a and the substrate 30. Further, the acoustic component 20 has a second member 22 that is difficult to change and has shape retention properties, and one of the four corners has a shape different from that of the other three corners. ing. Thereby, the position and posture of the sound absorbing material 25 can be appropriately maintained, and the effect of appropriately reducing the specific frequency can be exhibited.

  As described above, according to the acoustic component 20 of the present embodiment, the specific frequency can be appropriately reduced. In addition, it is possible to prevent sound from entering the microphone element 31 from the surroundings. In the present embodiment, the acoustic component 20 is used in combination with the microphone element 31, but it can be used in combination with a component related to sound other than the microphone element 31, for example, a speaker or the like.

  Although the preferred embodiment of the present invention has been described in detail, the present invention is not limited to the specific embodiment, and various modifications and changes can be made within the scope of the present invention described in the appended claims. Changes are possible.

In addition, regarding the description of the above embodiments, the following supplementary notes are further disclosed.
(Appendix 1)
A sheet-shaped first member,
A second member having an opening, and the first member bonded to the second member;
A third member having a storage portion communicating with the opening provided in the second member, and a back surface of a surface of the second member to which the first member is bonded,
A fourth member having an opening communicating with the storage portion provided in the third member, and a back surface of a surface of the third member to which the second member is bonded,
A sound absorbing material formed of a sponge-like material and stored in the storage portion in a compressed state,
An acoustic component comprising:
(Appendix 2)
The acoustic component according to claim 1, wherein a size of the opening provided in the fourth member is smaller than at least a size of the opening of the storage unit.
(Appendix 3)
3. The acoustic component according to claim 1, wherein the first member is formed of a nonwoven fabric.
(Appendix 4)
4. The second member according to any one of supplementary notes 1 to 3, wherein a shape of one corner is a substantially polygonal shape different from a shape of another corner, and the second member is harder than the third member and the fourth member. Sound components.
(Appendix 5)
The acoustic component according to any one of supplementary notes 1 to 4, wherein the fourth member is harder than the third member and softer than the second member.
(Appendix 6)
The acoustic component according to any one of supplementary notes 1 to 5, wherein the third member is formed of a sponge-like material thicker than the first member, the second member, and the fourth member.
(Appendix 7)
A housing provided with a plurality of sound holes,
A substrate disposed in the housing,
A plurality of microphone elements mounted at positions corresponding to the positions of the plurality of sound holes on the board,
Comprising a plurality of acoustic components arranged in the housing for each of the plurality of microphone elements,
Each of the acoustic components,
A sheet-shaped first member,
A second member having an opening, and the first member bonded to the second member;
A third member having a storage portion communicating with the opening provided in the second member, and a back surface of a surface of the second member to which the first member is bonded,
A fourth member having an opening communicating with the storage portion provided in the third member, and a back surface of a surface of the third member to which the second member is bonded,
An electronic device comprising: a sound absorbing material formed of a sponge-like material and stored in the storage portion in a compressed state.
(Appendix 8)
The electronic device according to claim 7, wherein the size of the opening provided in the fourth member is smaller than at least the size of the opening of the storage unit.
(Appendix 9)
The electronic device according to attachment 7 or 8, wherein the first member is formed of a nonwoven fabric.
(Appendix 10)
10. The second member according to any one of supplementary notes 7 to 9, wherein one corner portion has a substantially polygonal shape different from the other corner portions, and is harder than the third member and the fourth member. Electronic devices.
(Appendix 11)
The electronic device according to any one of supplementary notes 7 to 10, wherein the fourth member is harder than the third member and softer than the second member.
(Appendix 12)
The electronic device according to any one of supplementary notes 7 to 11, wherein the third member is formed of a sponge-like material thicker than the first member, the second member, and the fourth member.
(Appendix 13)
It has a first member, a second member having an opening, a third member having a storage portion, and a fourth member having an opening, and is formed of a sponge-like material, and is stored in a compressed state. A method for manufacturing an acoustic component including a sound absorbing material stored in a part,
Providing the opening provided in the second member in a second material forming the second member;
Providing the storage portion of the third member in a third material forming the third member;
Providing the opening provided in the fourth member in a fourth material forming the fourth member;
A step of overlapping and bonding a first material forming the first member and a second material provided with the opening,
A step of laminating and bonding the second material provided with the opening and the third material provided with the storage portion,
A step of overlapping and bonding a third material provided with the storage portion and a fourth material provided with the opening,
Cutting out a case member from the first material to the fourth material in the bonded state along the outer shape of the acoustic component;
Through the opening provided in the fourth member, compressing and pushing the sound absorbing material into the storage portion of the case member, and storing the sound absorbing material.
A method for producing an acoustic component comprising:

REFERENCE SIGNS LIST 1 electronic device 2 housing 2a front cover 2a1 first opening 8 acoustic component mounting portion 8a wall 9 screw receiving portion 10 positioning projection 20 acoustic component 200 case member 21 first member 210 first material 22 second member 220 Second material 221 Opening 23 Third member 230 Third material 231 Storage part 24 Fourth member 240 Fourth material 241 Opening 25 Sound absorbing material 30 Substrate 31 Microphone element

Claims (7)

A sheet-shaped first member,
A second member having a first opening, a shape of one corner portion being a substantially polygonal shape different from a shape of another corner portion, and a second member to which the first member is bonded;
Provided with a front Symbol accommodating portion communicating with the first opening, and a third member which back surface of the first member is bonded surface of the second member is bonded,
Communicate with the front Symbol housing portion, provided with a small second opening than the opening dimension of the housing portion, the back surface of the second member is bonded together the surface of the third member is bonded, cushioning A fourth member having ;
A sound absorbing material formed of a sponge-like material and stored in the storage portion in a compressed state,
With
The third member of the four-layer member is formed of a sponge-like material thicker than the first member, the second member, and the fourth member.
Sound components. 2. The acoustic component according to claim 1, wherein the fourth member contacts a substrate on which the microphone element is mounted, and the sound absorbing material is stored in the storage section in a state where the microphone element is embedded and compressed . 3.   The acoustic component according to claim 1, wherein the first member is formed of a nonwoven fabric. The second member of the previous SL acoustic component according to the third member and any one of hard claims 1 to 3 than the fourth member.   The acoustic component according to claim 1, wherein the fourth member is harder than the third member and softer than the second member. A housing provided with a plurality of sound holes,
A substrate disposed in the housing,
A plurality of microphone elements mounted at positions corresponding to the positions of the plurality of sound holes on the board,
Comprising a plurality of acoustic components arranged in the housing for each of the plurality of microphone elements,
Each of the acoustic components,
A sheet-shaped first member,
A second member having a first opening, a shape of one corner portion being a substantially polygonal shape different from a shape of another corner portion, and a second member to which the first member is bonded;
Provided with a front Symbol accommodating portion communicating with the first opening, and a third member which back surface of the first member is bonded surface of the second member is bonded,
Communicate with the front Symbol housing portion, provided with a small second opening than the opening dimension of the housing portion, the back surface of the second member is bonded together the surface of the third member is bonded, cushioning A fourth member having ;
A sound absorbing material formed of a sponge-like material and stored in the storage portion in a compressed state,
With
The third member of the four-layer member is formed of a sponge-like material thicker than the first member, the second member, and the fourth member.
Electronic devices. A sheet-like first member, a second member having a first opening, a third member having a storage portion, and a fourth member having a second opening are formed of a sponge-like material. A method of manufacturing an acoustic component including a sound absorbing material stored in the storage portion in a compressed state,
A step of the second member is formed, one shape of the corner portion providing a first opening front SL to the second material is a substantially polygonal shape different from the other corners of the shape,
Providing the accommodating portion communicating with the first opening in a third material forming the third member;
A step of providing the second opening smaller than the opening dimension of the storage part, communicating with the storage part to a fourth material having cushioning properties forming the fourth member;
A step of superposing and bonding a first material forming the first member and a second material provided with the first opening;
A step of overlapping and bonding a second material provided with the first opening and a third material provided with the storage portion;
A step of overlapping and bonding a third material provided with the storage portion and a fourth material provided with the second opening,
Cutting out a case member from the first material to the fourth material in the bonded state along the outer shape of the acoustic component;
A step of compressing and pushing the sound absorbing material into the storage portion of the case member through the second opening provided in the fourth member, and storing the same;
With
The third member of the four-layer member is formed of a sponge-like material thicker than the first member, the second member, and the fourth member .
A method for manufacturing acoustic components.

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