WO2013179631A1 - 音響部品用保護部材及び防水ケース - Google Patents
音響部品用保護部材及び防水ケース Download PDFInfo
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- WO2013179631A1 WO2013179631A1 PCT/JP2013/003313 JP2013003313W WO2013179631A1 WO 2013179631 A1 WO2013179631 A1 WO 2013179631A1 JP 2013003313 W JP2013003313 W JP 2013003313W WO 2013179631 A1 WO2013179631 A1 WO 2013179631A1
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- Prior art keywords
- protective member
- sound
- sound transmission
- acoustic
- transmission sheet
- Prior art date
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
- H04R1/023—Screens for loudspeakers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/08—Mouthpieces; Microphones; Attachments therefor
- H04R1/083—Special constructions of mouthpieces
- H04R1/086—Protective screens, e.g. all weather or wind screens
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/11—Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24777—Edge feature
Definitions
- the present invention relates to a protective member for an acoustic component and a waterproof case.
- sound equipment such as speakers and buzzers, and sound-related parts such as microphones (acoustic parts)
- acoustic parts such as mobile phones and digital cameras.
- an external housing of a waterproof camera provided with a microphone and a speaker is provided with an opening at a position corresponding to the microphone and the speaker.
- a filter having a waterproof sound-transmitting function
- a microporous membrane such as a stretched polytetrafluoroethylene (PTFE) film as a protective member for protecting acoustic components (see, for example, Patent Document 1).
- PTFE stretched polytetrafluoroethylene
- a microporous membrane such as a PTFE membrane proposed as a protective member in Patent Document 1 has a problem that it is easily deformed when an external stress is applied. Such a protective member is irreversibly deformed once exposed to high pressure. Such a deformation changes the vibration mode of the protective member, resulting in a decrease in sound permeability.
- the waterproof camera has a purpose of shooting underwater, so after using it in a diving state represented as IPX8 by the waterproof protection class (JIS C 0920), the irreversible deformation of the protective member becomes large. Sound permeability is greatly reduced.
- a net or non-woven fabric bonded with a PTFE film or a polyethylene terephthalate (PET) film is often used.
- PET polyethylene terephthalate
- the present invention does not significantly reduce the sound permeability after that even when used in a harsh environment exposed to a high pressure such as a diving state, and can maintain high performance stably. It aims at providing the protection member for components.
- the present invention provides a protective member for an acoustic component including a sound transmission sheet made of an elastomer.
- the present invention also provides: A protective member for an acoustic component including a sound transmission sheet made of an elastomer; A case including a frame having a sound passage opening and an operation opening, and a case including an elastic transparent film attached to the frame so as to close the operation opening; The protective member is attached to the case so as to close the sound passage opening.
- a waterproof case Provide a waterproof case.
- the sound transmission sheet is made of an elastomer. Therefore, even if the protection member for acoustic parts of the present invention is used in a harsh environment exposed to high pressure, irreversible deformation hardly occurs. As a result, the sound component protection member of the present invention can maintain high performance stably without being greatly deteriorated in sound permeability even after being exposed to a high pressure such as a diving state.
- the electronic device can be used in an environment where waterproofing is required by housing the electronic device such as a mobile phone inside the waterproof case.
- the electronic device can be operated through an elastic transparent film attached to the frame so as to close the operation opening.
- FIG. 2A is a front view which shows one Embodiment of the waterproof case of this invention. It is a rear view of the waterproof case shown in FIG. 2A.
- FIG. 2B is a cross-sectional view taken along line AA in FIG. 2A.
- FIG. 3 is a cross-sectional view taken along line BB in FIG. 2B.
- FIG. 5B is a sectional view taken along line VB-VB in FIG. 5A. It is sectional drawing which shows the state in which the protection member is installed in the test apparatus in the waterproof test. It is sectional drawing which shows the state of the sound permeable sheet before a waterproof test. It is sectional drawing which shows the state which the sound transmission sheet has deform
- FIG. 1A shows a cross-sectional view of the protection member 1 for an acoustic component of the present embodiment.
- FIG. 1B shows an installation example of the protection member 1 for an acoustic component of the present embodiment.
- the protection member 1 for an acoustic component includes a sound transmission sheet 11 and an adhesive layer 12 disposed on the peripheral edge of the sound transmission sheet 11.
- the sound transmission sheet 11 is made of an elastomer.
- the elastomer used for the sound transmission sheet 11 may be a rubber-like elastic body (thermosetting elastomer (rubber-based)) or a thermoplastic elastomer, but a rubber-like elastic body having rubber hardness may be used. preferable.
- the rubber-like elastic body is not particularly limited as long as it is a material having rubber-like elasticity. However, in order to achieve better sound transmission, it is desirable to use a rubber-like elastic body that satisfies the hardness of Type A in accordance with JIS K 6253 in the range of 20-80.
- examples of the rubber-like elastic body include silicone rubber, ethylene / propylene / diene rubber (EPDM), acrylic rubber, and natural rubber.
- silicone rubber having excellent characteristics such as heat resistance and chemical resistance is desirably used.
- the sound transmission sheet 11 may be subjected to a coloring process.
- the sound transmission sheet 11 When the sound transmission sheet 11 is transparent or white, the sound transmission sheet 11 may be conspicuous when the sound transmission sheet 11 is disposed so as to close the opening of the housing of the device. Therefore, the sound transmission sheet 11 is colored according to the color of the housing to be arranged, so that the sound transmission sheet 11 that is not noticeable when arranged in the housing can be realized. In that case, the sound transmission sheet 11 is colored, for example, black. Further, when importance is placed on the design of the housing, if the sound transmitting sheet 11 is arranged so as to block the opening of the housing, the design may be impaired. Therefore, by coloring the sound transmitting sheet 11 according to the design of the housing, the acoustic component protection member 1 having design can be realized.
- the coloring of the sound transmission sheet 11 can be performed, for example, when the elastomer constituting the sound transmission sheet 11 contains a colorant.
- the colorant to be used has a light absorption capability for at least part of light in a wavelength range of 380 nm to 500 nm, for example.
- the sound transmission sheet 11 be colored black, gray, brown, green, yellow, or pink with this colorant.
- the coloring method of the sound transmitting sheet 11 includes an elastomer before being formed into a sheet, that is, a method in which a coloring agent such as a pigment or carbon black is mixed into an elastomer raw material and coloring, and an elastomer after being formed into a sheet (sheet-like elastomer). ) With a colorant using a dyeing or printing technique. In addition, when carbon black is used as a colorant, the strength of the elastomer can be improved, and the effect that waterproofness described later can be improved is also obtained.
- a coloring agent such as a pigment or carbon black
- the sound transmission sheet 11 has a thickness of 10 to 150 ⁇ m, for example. By satisfying such a thickness range, the sound transmission sheet 11 having sufficient sound transmission can be obtained.
- a manufacturing method a raw material solution is extruded into a thin layer on a releasable base material by a discharging means such as a die, and after the raw material solution is poured onto a releasable base material, an applicator, a wire bar, a knife
- the sound transmitting sheet 11 can be adjusted to a desired thickness by a method of forming a thin film with a coater, and further by a cutting method.
- the film weight (area density) per unit area greatly affects sound transmission. It was known. Therefore, in the conventional protective member, the sound transmittance is improved by making the film thickness of the sound transmission sheet as thin as possible and keeping the surface density low.
- the present inventors have found that the sound transmission sheet 11 made of the elastomer of the present embodiment has a smaller correlation between the surface density and the sound transmission property than the conventional sound transmission sheet. Therefore, in the sound transmission sheet 11 of the present embodiment, the design freedom is higher than that of the conventional sound transmission sheet, and it is possible to select a thickness that can achieve both high strength and high sound transmission.
- the sound transmission sheet 11 has a waterproofness of 1 to 50 m in accordance with JIS L 1092 B method (high water pressure method). By having such a waterproof property, the protective member 1 can be used even under a higher water pressure, so that higher reliability can be obtained.
- the material of the adhesive layer 12 can be directly attached to and fixed to the acoustic component to which the protective member 1 is applied, or can be attached and fixed to the external housing protecting the acoustic component. As appropriate, it can be selected appropriately.
- a general-purpose double-sided tape with a base material or a double-sided tape without a base material can be attached to the sound transmission sheet 11, and a housing or case Can be used as appropriate in consideration of the sticking property.
- the adhesive layer 12 has a surface made of a silicone adhesive, and the surface made of the silicone adhesive is a surface in contact with the sound transmission sheet 11. preferable. This is because the silicone pressure-sensitive adhesive has very high adhesion to the silicone rubber sheet as compared with other acrylic pressure-sensitive adhesives and the like.
- Protective member 1 is not particularly limited as long as the acoustic component can be protected.
- the protective member 1 may be directly attached and fixed to the acoustic component to which the protective member 1 is applied by the adhesive layer 12.
- the protective member 1 may be attached and fixed by the adhesive layer 12 to an external housing that protects the acoustic component to which the protective member 1 is applied.
- the protective member 1 is fixed to the external housing 2 by the adhesive layer 12 so that the sound transmission sheet 11 closes the opening 3 provided in the external housing 2.
- casing 2 is provided in order to permeate
- the sound transmission sheet 11 is made of an elastomer. Therefore, even if the protection member 1 is used in a harsh environment exposed to a high pressure, the irreversible deformation of the sound transmission sheet 11 hardly occurs. As a result, the protective member 11 can maintain high performance stably without being greatly deteriorated in sound permeability even after being used in a harsh environment exposed to a high pressure such as a diving state.
- the method for producing the protective member 1 is not particularly limited, and a conventional method for producing a protective member can be used.
- the protective member 1 can be manufactured by the following method. First, a sheet-like elastomer for forming the sound transmission sheet 11 and an adhesive sheet (for example, double-sided tape) for forming the adhesive layer 12 are prepared. A hole is formed in advance in the pressure-sensitive adhesive sheet, which is a portion that transmits sound when the protective member 1 is installed.
- the protective member 1 can be obtained by laminating the pressure-sensitive adhesive sheet and a sheet-like elastomer and punching them into a predetermined shape.
- the adhesion layer 12 does not need to be provided.
- the sound transmission sheet 11 can be installed at a predetermined position by being sandwiched and fixed by an O-ring or the like, or fixed by resin sealing.
- the protective member 1 may further be provided with a net, a non-woven fabric or the like for dust prevention.
- Protective member 1 can also be applied to a waterproof case that houses an electronic device equipped with an acoustic component.
- a waterproof case that houses an electronic device equipped with an acoustic component.
- the waterproof case includes the protective member 1 and the case 100 described above.
- the case 100 includes a frame 110 and an elastic transparent film 120.
- the frame 110 has an upper frame 110a and a lower frame 110b.
- the upper frame 110a has a thin plate-like structure with a rectangular outline and a rectangular opening formed in the center.
- the upper frame 110a has a sound passage opening 111a, a sound passage opening 111b, and an operation opening 112.
- the lower frame 110b has a bottomed box shape with an upper opening, and has a sound passage opening 111c on the bottom surface.
- the elastic transparent film 120 is attached to the upper frame 110a so as to close the operation opening 112.
- the elastic transparent film 120 is, for example, a silicone rubber film or a urethane elastomer film.
- the protection member 1 is joined to the upper frame 110a via the adhesive layer 12 so as to close the sound passage opening 111b.
- the protection member 1 is joined to the upper frame 110a via the adhesive layer 12 so as to close the sound passage opening 111a.
- the protection member 1 is joined to the lower frame 110b via the adhesive layer 12 so as to close the sound passage opening 111c.
- the inside of the case 100 becomes waterproof.
- the electronic device 200 such as a mobile phone is disposed between the upper frame 110a and the lower frame 110b, and the electronic device 200 is accommodated inside the case 100, thereby waterproofing.
- the electronic device 200 can be used in an environment that requires the above.
- the sound passage opening 111a is located in a region corresponding to the sound passage opening 210a for the speaker of the electronic device 200.
- the sound passage opening 111b is located in an area corresponding to the microphone sound passage 210b of the electronic device 200.
- the sound passage opening 111c is located in an area corresponding to the sound passage opening 210c for the speaker of the electronic device 200. For this reason, sound is transmitted between the speaker or microphone of the electronic device 200 and the outside of the case 100 in a state where the electronic device 200 is housed inside the case 100. Therefore, the user can use the speaker or the microphone of the electronic device 200 in a state where the electronic device 200 is accommodated in the case 100.
- the elastic transparent film 120 is in contact with the electronic device 200 so as to cover the operation keys 220 and the display 230 of the electronic device 200 in a state where the electronic device 200 is accommodated in the case 100.
- the user can operate the operation key 220 through the elastic transparent film 120 and can visually recognize the display 230 through the elastic film 120. Further, when the display 230 is a touch panel display, the user can operate the display 230 via the elastic transparent film 120. For this reason, the user can operate the electronic device 200 in a state where the electronic device 200 is accommodated in the case 100.
- Example 1 A two-component heat-cured silicone resin manufactured by Toray Dow Corning Co., Ltd. is diluted in toluene, and the carbon black containing colorant manufactured by Dainichi Seika Kogyo Co., Ltd. is 0.2 weight per 100 parts by weight of the silicone resin. And mixed to make a part. Then, after flowing on a silicone release treatment PET separator (product name: MRS50) manufactured by Mitsubishi Plastics, a thin film was formed with an applicator, and then dried by heating to obtain a silicone rubber sheet having a thickness of 33 ⁇ m. This silicone rubber sheet was used as a sound transmission sheet. The thickness and hardness of the silicone rubber sheet used were as shown in Table 1. In addition, the measuring method of thickness and hardness is mentioned later.
- a double-sided tape (Nitto Denko Corporation, No. 5303W) was used as the adhesive layer.
- a protective member having an outer diameter of ⁇ 12 mm was formed by punching and molding a silicone rubber sheet and a double-sided tape in which a ⁇ 6 mm hole was previously formed.
- the double-sided tape was disposed on the peripheral edge of a circular silicone rubber sheet having a diameter of 12 mm, and the shape thereof was a ring shape having an outer diameter of 12 mm and an inner diameter of 6 mm.
- the protective member thus produced was attached to a polycarbonate (PC) plate having a diameter of 47 mm provided with a hole of 2 mm, and used as a sample for an acoustic test and a waterproof test.
- PC polycarbonate
- This PC board was used for the purpose of performing the following acoustic test and waterproof test on the protective member with the same sample.
- the ⁇ 2 mm hole in the PC plate was provided in the image of a sound hole provided in the case of a mobile phone or digital camera.
- the results of the acoustic test and the waterproof test are as shown in Table 1. In addition, the method of an acoustic test and a waterproof test is mentioned later.
- Example 2 A silicone rubber sheet having a thickness of 10 ⁇ m was obtained by the same method as in Example 1 except that the thickness when forming the thin film with the applicator was larger than that in Example 1.
- a protective member was produced in the same manner as in Example 1 using this silicone rubber sheet as a sound transmission sheet. Samples for acoustic tests and waterproof tests were also produced in the same manner as in Example 1.
- Example 3 A protective member was produced in the same manner as in Example 1 except that sheet-like EPDM rubber (EB80NNS, manufactured by Kureha Elastomer Co., Ltd.) was used as the sound transmission sheet. Samples for acoustic tests and waterproof tests were also produced in the same manner as in Example 1.
- sheet-like EPDM rubber EB80NNS, manufactured by Kureha Elastomer Co., Ltd.
- Example 1 A protective member was produced in the same manner as in Example 1 except that a stretched PTFE porous membrane (NTF1026, manufactured by Nitto Denko Corporation) was used as the sound transmission sheet. Samples for acoustic tests and waterproof tests were also produced in the same manner as in Example 1.
- Comparative Example 2 A material obtained by thermally bonding a PET net as a reinforcing material to the expanded PTFE porous membrane used in Comparative Example 1 (manufactured by Nitto Denko Corporation, NTF1026-N06) was used as a sound transmission sheet. Except for this point, a protective member was produced in the same manner as in Example 1. Samples for acoustic tests and waterproof tests were also produced in the same manner as in Example 1.
- ⁇ Method for measuring thickness of sound transmission sheet The thickness of the sheet was measured using a 1/1000 mm dial gauge ( ⁇ 10 mm).
- FIG. 5A and 5B show a method for installing the protective member 1 in an acoustic test.
- 5A is a plan view
- FIG. 5B is a cross-sectional view taken along line VB-VB in FIG. 5A.
- an acrylic case 22 having a length of 70 mm, a width of 50 mm, and a height of 15 mm was prepared, and a hole with a diameter of 13 mm was provided.
- the speaker 23 was attached to the inner wall of the case 22 at a position corresponding to the hole using a ring-shaped double-sided tape 24 having an outer diameter of ⁇ 16 mm and an inner diameter of ⁇ 13 mm.
- This case 22 was used to prevent the input sound from being blurred.
- the sample prepared for the acoustic test (the protective member 1 bonded to the PC plate 21) was attached to the outer wall of the case 22 with a double-sided tape 25 so as to close the hole of the case 22.
- reference numeral 26 denotes a lead wire of the speaker 23.
- the acoustic test was performed both before and after the waterproof test.
- the devices used in the acoustic test are as follows. Sound permeability evaluation device: 3560-B-030 manufactured by Bruel & Kjar Microphone: Type 2669 made by Bruel & Kjar Evaluation content: FFT (Fast Fourier Transform) 1kHz sound pressure evaluation Speaker: Star Seimitsu Co., Ltd. SCC-16A ⁇ 16mm Distance between microphone and speaker: 50mm Speaker load voltage: 1.0V
- the sample prepared for the waterproof test (the protective member 1 bonded to the PC plate 21) was installed in the waterproof test case 31.
- the sample was installed in the waterproof test case 31 in such a direction that the protective member 1 was positioned on the inner side of the case 31.
- the inside of the waterproof test case 31 was filled with water 32.
- the protection member 1 thus installed was subjected to a water pressure of 50 kPa corresponding to a water depth of 5 m assuming an IPX8 immersion test indicated by the waterproof protection class (IPX) defined in JIS C 0920.
- IPX waterproof protection class
- Example 1 when the sound pressure difference before the waterproof test was compared between Example 1 and Example 2 using the sound transmission sheet made of silicone rubber, the surface density of the sound transmission sheet of Example 2 was the sound transmission of Example 1. Despite being 2.7 times larger than the sheet, the sound pressure difference was not so large, and no significant reduction in sound permeability was confirmed.
- the protective member for acoustic parts of the present invention can maintain high performance stably without being greatly deteriorated in sound permeability even after being used in a harsh environment exposed to high pressure. Therefore, the protective member for acoustic parts of the present invention is useful not only as a waterproof mobile phone and a waterproof digital camera, but also as a protective member for acoustic parts mounted on equipment used in a diving state such as an underwater camera. .
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Abstract
Description
エラストマーからなる音透過シートを含む音響部品用保護部材と、
通音開口及び操作開口を有するフレームと、前記操作開口を塞ぐように前記フレームに取り付けられた弾性透明フィルムとを含むケースとを備え、
前記保護部材は、前記通音開口を塞ぐように前記ケースに取り付けられている、
防水ケースを提供する。
東レ・ダウコーニング株式会社製の2液加熱硬化シリコーン樹脂をトルエンに希釈し、シリコーン樹脂100重量部に対して、大日精化工業株式会社製のカーボンブラック含有着色剤をカーボンブラックが0.2重量部になるように加えて混合した。その後、三菱樹脂株式会社製シリコーン離型処理PETセパレータ(品名:MRS50)上に流涎し、アプリケータにて薄膜形成した後、加熱乾燥させて、厚さ33μmのシリコーンゴムシートを得た。このシリコーンゴムシートを音透過シートとして用いた。用いられたシリコーンゴムシートの厚さ及び硬度は、表1に示すとおりであった。なお、厚さ及び硬度の測定方法については、後述する。粘着層として、両面テープ(日東電工株式会社製、No.5303W)を用いた。シリコーンゴムシートと、予めφ6mmの穴が形成された両面テープとを組み合わせて打抜き成形して、外径φ12mmの保護部材を形成した。両面テープは、φ12mmの円形のシリコーンゴムシートの周縁部上に配置され、その形状は外径φ12mm及び内径φ6mmのリング状であった。
アプリケータにて薄膜形成する際の厚さを実施例1よりも大きくしたこと以外は、実施例1と同様の方法によって、厚さ10μmのシリコーンゴムシートを得た。このシリコーンゴムシートを音透過シートとして用いて、実施例1と同様の方法で保護部材を作製した。また、音響試験及び防水試験用のサンプルも、実施例1と同様に作製した。
音透過シートとしてシート状のEPDMゴム(クレハエラストマー株式会社製、EB80NNS)を用いた点以外は、実施例1と同様の方法で保護部材を作製した。また、音響試験及び防水試験用のサンプルも、実施例1と同様に作製した。
音透過シートとして延伸PTFE多孔膜(日東電工株式会社製、NTF1026)を用いた点以外は、実施例1と同様の方法で保護部材を作製した。また、音響試験及び防水試験用のサンプルも、実施例1と同様に作製した。
比較例1で用いられた延伸PTFE多孔膜に、補強材としてPETネットを熱接着させたもの(日東電工株式会社製、NTF1026-N06)を、音透過シートとして用いた。この点以外は、実施例1と同様の方法で保護部材を作製した。また、音響試験及び防水試験用のサンプルも、実施例1と同様に作製した。
1/1000mmのダイヤルゲージ(φ10mm)を用いて、シートの厚さを測定した。
JIS K 6253に準拠するタイプAのデュロメータにて、音透過シートに用いられたエラストマーの硬度を測定した。
図5A及び5Bに、音響試験における保護部材1の設置方法が示されている。図5Aは平面図であり、図5Bは図5AのVB-VB線に沿った断面図である。まず、長さ70mm、幅50mm、高さ15mmのアクリルケース22を用意し、φ13mmの穴を設けた。この穴に対応する位置に、外径φ16mm、内径φ13mmのリング状の両面テープ24を用いて、ケース22の内壁にスピーカ23を貼り付けた。このケース22は、入力音がぶれないようにするために用いられた。さらに、このケース22の外壁に、ケース22の穴を塞ぐように、音響試験用に作製された前記サンプル(保護部材1をPC板21に貼り合わせたもの)を両面テープ25で貼り付けた。図中、符号26はスピーカ23のリード線を示す。このように保護部材1を設置したときと、設置しなかったときとの音圧を通音性評価装置を用いて測定し、測定値の差をとることで、音圧変化(dB)を評価した。入力音の音圧については、保護部材1を設置しなかったときの大きさが約90dBとなるように、スピーカ23の負荷電圧と、マイク(図示せず)とスピーカ23との距離を調整した。なお、音響試験は、防水試験前と防水試験後との両方で行われた。音響試験で用いられた装置等は、以下のとおりである。
通音性評価装置:Bruel&Kjar社製 3560-B-030
マイク: Bruel&Kjar社製 Type2669
評価内容:FFT(高速フーリエ変換) 1kHzの音圧評価
スピーカ:スター精密社製 SCC-16A φ16mm
マイクとスピーカとの距離:50mm
スピーカの負荷電圧:1.0V
図6に示すように、防水試験用に作製された前記サンプル(保護部材1をPC板21に貼り合わせたもの)を、防水試験ケース31に設置した。前記サンプルは、保護部材1がケース31の内部側に位置する向きで、防水試験ケース31に設置された。防水試験ケース31の内部は水32で満たされていた。このように設置された保護部材1に対し、JIS C 0920で規定された防水保護等級(IPX)に示されるIPX8の浸水試験を想定し、水深5m相当の50kPaの水圧を負荷した。JIS L 1092 B法(高水圧法)の試験方式で、50kPaで昇圧をとめ、30分保持した。なお、このとき、水圧がかかっていない防水試験前の音透過シート11(図7A)とは異なり、音透過シート11には水圧がかかって、図7Bに示すような変形が生じていた。その後、目視にて、保護部材1の音透過シート11の変形が残っているかどうかを確認した。
Claims (10)
- エラストマーからなる音透過シートを含む、
音響部品用保護部材。 - 前記エラストマーが、JIS K 6253に準拠するタイプAの硬度が20~80であるゴム状弾性体である、
請求項1に記載の音響部品用保護部材。 - 前記音透過シートの厚さが、10~150μmである、
請求項1に記載の音響部品用保護部材。 - 前記音透過シートのJIS L1092 B法(高水圧法)に準拠する防水性が、1~50mである、
請求項1に記載の音響部品用保護部材。 - 前記音透過シートの周縁部上に配置された粘着層をさらに含む、
請求項1に記載の音響部品用保護部材。 - 前記粘着層が耐熱性両面テープからなる、
請求項5に記載の音響部品用保護部材。 - 前記粘着層は、シリコーン粘着剤からなる面を有する、
請求項5に記載の音響部品用保護部材。 - 前記エラストマーが着色剤を含んでおり、
前記着色剤は、380nm以上500nm以下の波長域の少なくとも一部の光についての光吸収能を有する、
請求項1に記載の音響部品用保護部材。 - 前記エラストマーが着色剤を含んでおり、
前記音透過シートは、前記着色剤によって、黒色、灰色、茶色、緑色、黄色又は桃色に着色されている、
請求項1に記載の音響部品用保護部材。 - エラストマーからなる音透過シートを含む音響部品用保護部材と、
通音開口及び操作開口を有するフレームと、前記操作開口を塞ぐように前記フレームに取り付けられた弾性透明フィルムとを含むケースとを備え、
前記保護部材は、前記通音開口を塞ぐように前記ケースに取り付けられている、
防水ケース。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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EP13796471.4A EP2869590B1 (en) | 2012-05-31 | 2013-05-24 | Protective member for acoustic component and waterproof case |
KR1020197038965A KR20200004447A (ko) | 2012-05-31 | 2013-05-24 | 음향 부품용 보호 부재 및 방수 케이스 |
US14/404,298 US10219054B2 (en) | 2012-05-31 | 2013-05-24 | Protective member for acoustic component and waterproof case |
KR20147036501A KR20150021960A (ko) | 2012-05-31 | 2013-05-24 | 음향 부품용 보호 부재 및 방수 케이스 |
KR1020217020111A KR20210082566A (ko) | 2012-05-31 | 2013-05-24 | 음향 부품용 보호 부재 및 방수 케이스 |
CN201380028437.XA CN104350762B (zh) | 2012-05-31 | 2013-05-24 | 声学部件用保护构件和防水外壳 |
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JP2012-124284 | 2012-05-31 |
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PCT/JP2013/003313 WO2013179631A1 (ja) | 2012-05-31 | 2013-05-24 | 音響部品用保護部材及び防水ケース |
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US (1) | US10219054B2 (ja) |
EP (1) | EP2869590B1 (ja) |
JP (1) | JP6193621B2 (ja) |
KR (3) | KR20210082566A (ja) |
CN (1) | CN104350762B (ja) |
TW (2) | TWI658735B (ja) |
WO (1) | WO2013179631A1 (ja) |
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US20150146905A1 (en) | 2015-05-28 |
KR20210082566A (ko) | 2021-07-05 |
CN104350762A (zh) | 2015-02-11 |
JP6193621B2 (ja) | 2017-09-06 |
TW201838425A (zh) | 2018-10-16 |
CN104350762B (zh) | 2018-09-11 |
JP2014007738A (ja) | 2014-01-16 |
KR20200004447A (ko) | 2020-01-13 |
TW201415908A (zh) | 2014-04-16 |
EP2869590A4 (en) | 2016-03-23 |
TWI672048B (zh) | 2019-09-11 |
EP2869590A1 (en) | 2015-05-06 |
US10219054B2 (en) | 2019-02-26 |
KR20150021960A (ko) | 2015-03-03 |
EP2869590B1 (en) | 2020-02-26 |
TWI658735B (zh) | 2019-05-01 |
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