JP2016165104A - 音響抵抗体と、それを備える音響抵抗体部材および音響機器 - Google Patents
音響抵抗体と、それを備える音響抵抗体部材および音響機器 Download PDFInfo
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- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2807—Enclosures comprising vibrating or resonating arrangements
- H04R1/2811—Enclosures comprising vibrating or resonating arrangements for loudspeaker transducers
-
- 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
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2807—Enclosures comprising vibrating or resonating arrangements
- H04R1/2815—Enclosures comprising vibrating or resonating arrangements of the bass reflex type
- H04R1/2823—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material
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- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
-
- 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
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
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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
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2807—Enclosures comprising vibrating or resonating arrangements
- H04R1/2815—Enclosures comprising vibrating or resonating arrangements of the bass reflex type
- H04R1/2823—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material
- H04R1/2826—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material for loudspeaker transducers
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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
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
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- H—ELECTRICITY
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- H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
- H04R2460/11—Aspects relating to vents, e.g. shape, orientation, acoustic properties in ear tips of hearing devices to prevent occlusion
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- Acoustics & Sound (AREA)
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- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
- Headphones And Earphones (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
【解決手段】厚さ方向に通気性を有する樹脂フィルムを含み、当該樹脂フィルムが、厚さ方向に貫通する直線状に延びた複数の貫通孔が形成された非多孔質のフィルムである音響抵抗体とする。この音響抵抗体は、音と電気信号とを変換する音響子を備えた変換部と、変換部が収容された、少なくとも1つの開口を有するハウジングとを備え、当該開口に通じるとともに音響子が配置された気体の経路がハウジング内に存在する音響機器において、上記気体の経路における当該開口と音響子との間に配置される。
【選択図】図1
Description
前記音響機器は:音を出力および/または入力する音響子を備えた、音と電気信号とを変換する変換部と;前記変換部が収容された、少なくとも1つの開口を有するハウジングと、を備え、
前記少なくとも1つの開口に通じる気体の経路が前記ハウジング内に存在し、前記音響子は前記経路に配置され、前記音響抵抗体は、前記経路における、前記少なくとも1つの開口と前記音響子との間に配置されるとともに、厚さ方向に通気性を有する樹脂フィルムを含み、前記樹脂フィルムは、厚さ方向に貫通する直線状に延びた複数の貫通孔が形成された非多孔質のフィルムである音響抵抗体を提供する。
図1に、本発明の音響抵抗体を備える音響機器の一例を示す。図1に示す音響機器は、イヤホンの片側(右側または左側)を構成するイヤホンユニット1である。イヤホンユニット1は、本発明の音響機器の一例でもある。
音響抵抗体8の製造方法は特に限定されず、例えば、以下に説明する製造方法により製造できる。
工程(I)では、イオンビームを原フィルムに照射する。イオンビームは、加速されたイオンにより構成される。イオンビームの照射により、当該ビーム中のイオンが衝突した原フィルムが形成される。
工程(II)では、工程(I)においてイオンビームを照射した後の原フィルム102におけるイオン101が衝突した部分の少なくとも一部を化学エッチングして、イオン101の衝突の軌跡103に沿って延びる貫通孔83を当該フィルムに形成する。このようにして得た樹脂フィルム81における貫通孔83以外の部分は、フィルムの状態を変化させる工程をさらに実施しない限り、基本的に、イオンビーム照射前の原フィルム102と同じである。
本発明の音響抵抗体部材の一例を、図12に示す。図12に示す音響抵抗体部材91は、主面に垂直な方向から見た形状が円形である音響抵抗体8と、当該抵抗体8の周縁部に接合されたリング状のシートである支持体92とを備える。音響抵抗体8に支持体92が接合された形態により、音響抵抗体8が補強されるとともに、その取扱性が向上する。また、支持体92が、音響抵抗体部材91を音響機器に配置する際の取り付けしろとなるため、音響抵抗体8の取り付け作業が容易となる。
本発明の音響機器の一例は、図1に示すイヤホンユニット1である。イヤホンユニット1の具体的な構成は、音響抵抗体の説明において上述したとおりである。
厚さ方向に貫通する複数の貫通孔が形成された非多孔質の市販のPETフィルム(it4ip製、Track etched membrane、厚さ45μm)を準備した。当該フィルムの貫通孔の径は3.0μm、孔密度は2.0×106個/cm2であった。
比較例1の音響抵抗体として、市販の不織布(旭化成せんい製、スマッシュY15250)を準備した。この不織布は、スパンボンド法により形成されたポリエチレンテレフタレート繊維から構成される不織布であり、その見かけ密度は0.44g/cm3であった。
2 変換部
21 音響子(振動板)
22 マグネット
23 フレーム
24 (フレーム23の)開口
3 (イヤホンユニット1の)ハウジング
3a フロントハウジング
3b リアハウジング
4 ケーブル
5 通音口
6,6a,6b 開口
7 気体の経路
8 音響抵抗体
81 樹脂フィルム
82 撥液層
83 貫通孔
84a,84b (樹脂フィルム81の)主面
85 開口
86 (貫通孔83の)中心軸
87 (貫通孔83の中心軸86が延びる方向に垂直な)断面
88a (主面84aにおける貫通孔83の)開口
88b (主面84bにおける貫通孔83の)開口
89 通気性支持層
91 音響抵抗体部材
92 支持体
101 イオン
102 原フィルム
103 軌跡(イオントラック)
104 イオンビーム
105 送出ロール
106 照射ロール
107 巻取ロール
201 サンプル
202 測定ポイント
Claims (8)
- 音響機器に使用する音響抵抗体であって、
前記音響機器は、
音を出力および/または入力する音響子を備えた、音と電気信号とを変換する変換部と、
前記変換部が収容された、少なくとも1つの開口を有するハウジングと、を備え、
前記少なくとも1つの開口に通じる気体の経路が前記ハウジング内に存在し、
前記音響子は前記経路に配置され、
前記音響抵抗体は、前記経路における、前記少なくとも1つの開口と前記音響子との間に配置されるとともに、厚さ方向に通気性を有する樹脂フィルムを含み、
前記樹脂フィルムは、厚さ方向に貫通する直線状に延びた複数の貫通孔が形成された非多孔質のフィルムである、音響抵抗体。 - 前記貫通孔の径が3.0μm以上13.0μm以下である、請求項1に記載の音響抵抗体。
- 前記経路の断面を覆うように配置される、請求項1または2に記載の音響抵抗体。
- 撥液層をさらに含む、請求項1〜3のいずれかに記載の音響抵抗体。
- 請求項1〜4のいずれかに記載の音響抵抗体と、
前記音響抵抗体に接合された支持体と、を備える音響抵抗体部材。 - 音を出力および/または入力する音響子を備えた、音と電気信号とを変換する変換部と、前記変換部が収容された、少なくとも1つの開口を有するハウジングと、を備え、
前記少なくとも1つの開口に通じる気体の経路が前記ハウジング内に存在し、
前記音響子は前記経路に配置され、
前記経路における、前記少なくとも1つの開口と前記音響子との間に配置された、厚さ方向に通気性を有する樹脂フィルムを含む音響抵抗体をさらに備え、
前記音響抵抗体が、請求項1〜4のいずれかに記載の音響抵抗体である、音響機器。 - 前記ハウジングに2以上の前記開口が設けられており、
前記2以上の開口は、前記音響子と前記ハウジングの外部との間で前記音を伝達する通音口を含み、
少なくとも、前記通音口とは異なる前記開口に通じる前記経路に、前記音響抵抗体が配置されている、請求項6に記載の音響機器。 - 前記音響機器が、イヤホン、イヤホンユニット、ヘッドホン、ヘッドホンユニット、ヘッドセット、ヘッドセットユニット、受話器、補聴器またはウェアラブル端末である、請求項6または7に記載の音響機器。
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