JP2007165938A - Earphone device - Google Patents

Earphone device Download PDF

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JP2007165938A
JP2007165938A JP2005352126A JP2005352126A JP2007165938A JP 2007165938 A JP2007165938 A JP 2007165938A JP 2005352126 A JP2005352126 A JP 2005352126A JP 2005352126 A JP2005352126 A JP 2005352126A JP 2007165938 A JP2007165938 A JP 2007165938A
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bone conduction
conduction speaker
tragus
piezoelectric element
band member
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Akiko Takashima
晶子 鷹島
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Tokin Corp
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NEC Tokin Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a light bone conduction earphone device having improved sound quality, high conversion efficiency, and improved attachment properties. <P>SOLUTION: The earphone device comprises a bone conduction speaker 11 for generating acoustic vibration, and an arcuate band member 12 rotating downward on a face surface. In the earphone device, the bone conduction speaker 11 mechanically coupled to both the ends of the band member 12 has a key-shaped projection 17 at the tip, and is hooked to a tragus or the front cartilage of a cavum conchae section. The arcuate band member 12 is made of an elastic material, so that the tip of the bone conduction speaker 11 is pressed against the tragus or cavum conchae section with fixed pressure. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、骨伝導スピーカを用いた受話装置に関するものである。   The present invention relates to a receiver using a bone conduction speaker.

音情報を人の聴覚器官である内耳に伝達する受話装置には、音発生部（以下、スピーカとよぶ）を成す振動体の相違により、気導式と骨導式とがある。気導式の受話装置は、外耳道の入り口部にスピーカを当接し、外耳道、鼓膜を含む中耳伝音系を介して気導経由で音声情報を内耳へ伝達するように設計されている。   There are two types of receivers that transmit sound information to the inner ear, which is a human auditory organ, depending on the vibrator that forms a sound generator (hereinafter referred to as a speaker). The air-conducting receiver is designed so that a speaker is brought into contact with the entrance of the ear canal and audio information is transmitted to the inner ear via the air conduction through the middle ear transmission system including the ear canal and the eardrum.

骨導式の受話装置は、耳介近傍や下顎骨等の骨組織上の皮膚に振動子を押圧することにより、中耳伝音系を介さずに、骨組織を介して音声情報を直接内耳へ伝達するように設計されている。このような骨導式の受話装置が使用される目的は、主に中耳の機能が低下した難聴者に対する補聴であるが、近年は騒音下で聴き取りやすい受話手段として健聴者に対しても活用され始めている。   Bone-conducting receivers directly press voice information through the inner ear without passing through the middle ear transmission system by pressing the vibrator against the skin on the bone tissue such as the vicinity of the pinna or the mandible. Designed to communicate to. The purpose of using such a bone-conducted receiver is mainly for hearing aids for hearing-impaired people whose function of the middle ear has deteriorated. It has begun to be utilized.

骨導式による受話装置に関連する周知技術としては、例えば、骨伝導スピーカを外耳道の入り口部以外の場所に置き、外耳道を開放したままで骨導音による音声情報の聴取が出来る構造の骨伝導ヘッドセットが提案されている。図１は、従来の骨伝導ヘッドセットを示す説明図である。従来の骨伝導ヘッドセット１は、ボイスコイルとマグネットとヨーク等からなる電磁式のスピーカ３をヘッドバンド２の端部に固定部材４を介して固定する構造をしている。スピーカ３はヘッドバンド２により、耳近傍に押圧され、スピーカ３の振動を骨に伝える。このような骨伝導ヘッドセットは特許文献１に開示されている。   As a well-known technique related to a bone-conduction type receiving device, for example, a bone conduction speaker having a structure in which a bone conduction speaker is placed in a place other than the entrance of the ear canal and sound information can be heard by bone conduction sound while the ear canal is opened. A headset has been proposed. FIG. 1 is an explanatory view showing a conventional bone conduction headset. A conventional bone conduction headset 1 has a structure in which an electromagnetic speaker 3 including a voice coil, a magnet, a yoke, and the like is fixed to an end of a headband 2 via a fixing member 4. The speaker 3 is pressed near the ear by the headband 2 and transmits the vibration of the speaker 3 to the bone. Such a bone conduction headset is disclosed in Patent Document 1.

図２は、従来の骨伝導スピーカを用いた受話装置を示す説明図である。図２に示す受話装置５は、クリップ８に電磁式の骨伝導スピーカ７が固定された構造をしている。この受話装置５は、耳垂６を前記クリップ８で挟むことで、骨伝導スピーカ７が耳垂６に押圧され、骨伝導スピーカ７の発生する振動を耳垂６に伝えるものである。このような骨伝導スピーカを用いた受話装置は特許文献２に開示されている。   FIG. 2 is an explanatory view showing a receiving device using a conventional bone conduction speaker. The receiving device 5 shown in FIG. 2 has a structure in which an electromagnetic bone conduction speaker 7 is fixed to a clip 8. In this receiver 5, the bone conduction speaker 7 is pressed against the ear lobe 6 by sandwiching the ear lobe 6 with the clip 8, and the vibration generated by the bone conduction speaker 7 is transmitted to the ear lobe 6. A receiver using such a bone conduction speaker is disclosed in Patent Document 2.

工場や工事現場などの高騒音環境下においては、作業者の騒音性難聴を防ぐため、騒音を遮断する必要が生じる。そのような状況で、情報の採取、通信を行うためには、ヘッドホンや、イヤホンを装着し音声を聞くことになるが、高騒音環境下においては、十分な遮音効果が期待できず、音声情報が聞き取りにくいことが多い。   In a noisy environment such as a factory or a construction site, it is necessary to block noise in order to prevent a worker from hearing loss. In such a situation, in order to collect and communicate information, you will be able to listen to the sound by wearing headphones and earphones. Are often difficult to hear.

従来、高騒音下で音声を聴取する方法として、ヘッドホンの両端にカップ状の遮音外被体を付設し、当該遮音外被体の内部にスピーカを配設する構造の携帯電話での音声聴取用のイヤーマフや、送受話器それぞれに周囲の雑音を消音するノイズキャンセル手段を設けたヘルメットまたはヘッドセットなどが提案されている。このような受話装置は特許文献３及び特許文献４に開示されている。   Conventionally, as a method of listening to sound under high noise, for listening to sound on a mobile phone having a structure in which a cup-shaped sound insulation casing is attached to both ends of headphones and a speaker is disposed inside the sound insulation covering. A helmet or a headset provided with a noise canceling means for silencing the surrounding noise is proposed for each earmuff. Such a receiver is disclosed in Patent Document 3 and Patent Document 4.

特開２００１−３１３９８９号公報JP 2001-313989 A 特開２００１−３２０７９０号公報JP 2001-320790 A 登録実用新案第３０２３１１６号公報Registered Utility Model No. 3023116 特開２００５−０７２７０３号公報JP 2005-072703 A

しかし、前記、従来の骨伝導ヘッドセット或いは骨伝導スピーカを用いた受話装置は、スピーカにボイスコイルとマグネットとヨーク等からなる電磁式を採用しているので、形状が大きく、かつ重量が重く、使用に際して、疲労を感じるなど長時間の装着には適さないという問題点がある。また、周波数特性などの音質や音圧、電気音響信号から音響振動への変換効率、あるいは頭部や耳垂への装着性など、実用に供するための条件をすべて満たすものが無いという問題がある。また、前記従来のイヤーマフやヘッドセットにおいては、形状が大きく、重量感もあるため、長時間の装着時に疲労感を感じる。さらに部品点数も多く製造コストが高いという問題もある。   However, since the conventional bone conduction headset or bone conduction speaker using the bone conduction speaker employs an electromagnetic type consisting of a voice coil, a magnet, a yoke and the like for the speaker, the shape is large and the weight is heavy. In use, there is a problem that it is not suitable for long-time wearing such as feeling fatigue. In addition, there is a problem that none of the conditions for practical use such as sound quality and sound pressure such as frequency characteristics, conversion efficiency from electroacoustic signals to acoustic vibrations, or wearability to the head or earlobe is satisfied. In addition, the conventional earmuffs and headsets have a large shape and a feeling of weight, so that they feel tired when worn for a long time. There is also a problem that the number of parts is large and the manufacturing cost is high.

従って、本発明は、上記従来技術の問題点を解決することを課題とする。具体的には、音質に優れ、変換効率が高く、また、高騒音環境下においても、音声が明瞭に聴取でき、軽量で装着性の良い、低価格な、骨導式の受話装置を提供することを課題とする。   Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art. Specifically, the present invention provides a bone-conduction receiving device that is excellent in sound quality, has high conversion efficiency, can be heard clearly even in a noisy environment, is lightweight, easy to wear, and inexpensive. This is the issue.

本発明は、前記課題を解決するために、以下の手段を採用した。即ち、種々の実験を通じて骨伝導の振動入力部として耳珠近傍が最も敏感に音声を伝達できることを確認した上で、小型で軽量な圧電素子を利用した骨伝導スピーカを使用し、前記耳珠部分近傍に骨伝導スピーカを押圧する手段として、骨伝導スピーカに耳珠もしくは耳甲介腔部の前部軟骨部に掛止可能な形状の突起部或いは耳栓を設け、弾性を有するバンド部材の端部に骨伝導スピーカを配置することを要旨とする。   The present invention employs the following means in order to solve the above problems. That is, through various experiments, it was confirmed that the vicinity of the tragus could transmit the sound most sensitively as a bone conduction vibration input unit, and then a bone conduction speaker using a small and lightweight piezoelectric element was used. As a means to press the bone conduction speaker in the vicinity, the bone conduction speaker is provided with a protrusion or earplug shaped to be hookable on the tragus or the front cartilage portion of the concha cavity, and the end of the elastic band member The gist is to arrange a bone conduction speaker in the section.

本発明による第１の発明は、圧電素子を可とう性部材で被覆してなる圧電素子の振動を利用して音響振動を発生する骨伝導スピーカであって、前記骨伝導スピーカが耳珠もしくは耳甲介腔部の前部軟骨部に掛止可能な形状の突起部を有することを特徴とする受話装置である。   According to a first aspect of the present invention, there is provided a bone conduction speaker that generates acoustic vibration using vibrations of a piezoelectric element formed by coating a piezoelectric element with a flexible member, and the bone conduction speaker is a tragus or an ear. A receiving device characterized by having a protruding portion having a shape that can be hooked to a front cartilage portion of a concha cavity portion.

本発明では、圧電素子の逆圧電効果を利用し、電気音響信号を音響振動に変換する骨伝導スピーカを使用する。前記骨伝導スピーカは圧電素子と可とう性物材とで構成する。具体的には、圧電素子全体を可とう性部材で覆う構造とする。圧電素子は、バイモルフ構造やユニモルフ構造を成す撓みの振動を発生する圧電素子や、積層型圧電アクチュエータの様に縦振動を発生する圧電素子が好適である。   In the present invention, a bone conduction speaker that uses an inverse piezoelectric effect of a piezoelectric element to convert an electroacoustic signal into acoustic vibration is used. The bone conduction speaker is composed of a piezoelectric element and a flexible material. Specifically, the whole piezoelectric element is covered with a flexible member. The piezoelectric element is preferably a piezoelectric element that generates a bending vibration having a bimorph structure or a unimorph structure, or a piezoelectric element that generates a longitudinal vibration such as a laminated piezoelectric actuator.

前記圧電素子を、人体の皮膚の音響インピーダンスに近い音響インピーダンスを有する可とう性部材で、全体を覆うことにより、音響振動出力部と人体との境界面での反射によって生じる、受話装置が発生する音響振動の伝達損失が減少し、振動の伝達効率が向上する。また、可とう性部材で、圧電素子全体を覆うことにより、骨伝導スピーカ部の共振の先鋭度Ｑが低下するので、周波数特性が平坦な受話装置が得られる。   By covering the entire piezoelectric element with a flexible member having an acoustic impedance close to the acoustic impedance of the human skin, a receiving device is generated due to reflection at the boundary surface between the acoustic vibration output unit and the human body. The transmission loss of acoustic vibration is reduced and the transmission efficiency of vibration is improved. Moreover, since the sharpness Q of resonance of the bone conduction speaker portion is reduced by covering the entire piezoelectric element with the flexible member, a receiver having a flat frequency characteristic can be obtained.

さらに、前記骨伝導スピーカの先端に鍵状の突起を設け、耳珠もしくは耳甲介腔部の前部軟骨に掛止する構造とし、耳珠近傍に骨伝導スピーカが押圧されるような付勢力を持たせることで、装着が非常に簡易、かつ外れにくく、骨への振動の伝達効率の良い受話装置が得られる。加えて、外耳道は完全に解放されており周囲の音声が遮断されず、閉塞感が無い受話装置が得られる。   Further, a key-like protrusion is provided at the tip of the bone conduction speaker, and the bone conduction speaker is pressed against the front cartilage of the tragus or concha cavity, so that the bone conduction speaker is pressed in the vicinity of the tragus. Thus, it is possible to obtain a receiving device that is very simple to wear and difficult to come off and has a high transmission efficiency of vibration to the bone. In addition, the ear canal is completely released, the surrounding voice is not blocked, and a receiving device without a feeling of obstruction is obtained.

本発明による第２の発明は、前記第１の発明の受話装置において、前記骨伝導スピーカがバンド部材の少なくとも一端部に配されてなり、前記骨伝導スピーカが耳珠近傍に押圧されるよう付勢されていることを特徴とする受話装置である。   According to a second aspect of the present invention, in the receiver according to the first aspect, the bone conduction speaker is disposed at least at one end of a band member so that the bone conduction speaker is pressed near the tragus. The receiver is characterized by being powered.

本発明の受話装置は、前記バンド部材を両耳近傍と顎の下方近傍を結ぶ円弧状等にすることで、前記骨伝導スピーカの先端に設けた鍵状の突起が、耳珠もしくは耳甲介腔部の前部軟骨に押圧され、且つ掛止する構造となり、装着が非常に簡易、かつ外れにくい受話装置が得られる。また、圧電素子の採用により、きわめて軽量でかつシンプルな受話装置が得られる。   In the receiver of the present invention, the band member is formed in an arc shape or the like connecting the vicinity of both ears and the vicinity of the lower part of the chin, so that the key-shaped protrusion provided at the tip of the bone conduction speaker is the tragus or the concha. A receiving device is obtained that is pressed against and latched by the front cartilage of the cavity, and is very easy to mount and difficult to come off. In addition, by adopting the piezoelectric element, a very light and simple receiver can be obtained.

本発明の受話装置は、弾性材等で構成されるバンド部材の弾性力によって、バンド部材の端部に配置された前記骨伝導スピーカの先端が耳珠もしくは耳甲介腔部に一定の圧力で押圧される構造のため、効率よく音響振動を耳珠近傍に伝達することが可能となり、非常に明瞭な音声が得られる。また、電気音響信号から音響振動への変換器として、圧電素子を用いたので、変換効率が高い。   The earpiece of the present invention is configured such that the tip of the bone conduction speaker arranged at the end of the band member is applied to the tragus or concha cavity with a certain pressure by the elastic force of the band member made of an elastic material or the like. Due to the pressed structure, it is possible to efficiently transmit acoustic vibration to the vicinity of the tragus, and a very clear sound can be obtained. Moreover, since the piezoelectric element is used as the converter from the electroacoustic signal to the acoustic vibration, the conversion efficiency is high.

前記第２の発明において、前記バンド部材の両端にそれぞれ１つの骨伝導スピーカ部を配置することで、骨伝導スピーカが発生する音響信号を両耳に伝達することができステレオ効果が得られる受話装置が得られる。また、前記骨伝導スピーカ部は、１つ或いは複数としても良い。例えば骨伝導スピーカ部をバンド部材の一端にのみ配置する形態の受話装置では、軽量、低コストな受話装置となり、骨伝導スピーカ部をバンド部材の両端に且つ複数配置する形態では、より伝達効率の高い受話装置が得られる。   In the second aspect of the present invention, an audio signal generated by the bone conduction speaker can be transmitted to both ears by providing one bone conduction speaker unit at both ends of the band member, and a stereo effect can be obtained. Is obtained. The bone conduction speaker unit may be one or more. For example, a receiving device in which the bone conduction speaker unit is arranged only at one end of the band member is a light-weight and low-cost receiving device. In a configuration in which a plurality of bone conduction speaker units are arranged at both ends of the band member, the transmission efficiency is higher. A high receiver can be obtained.

本発明による第３の発明は、前記第２の発明の受話装置において、前記圧電素子と前記バンド部材は、一体となるよう可とう性部材で成形されてなることを特徴とする受話装置である。   A third invention according to the present invention is the receiver according to the second invention, wherein the piezoelectric element and the band member are formed of a flexible member so as to be integrated. .

本発明の受話装置では、さらに、骨伝導スピーカとバンド部材の被覆部材は全て同じ可とう性の物質で構成でき、一つの金型で一体成形できることにより、部品点数の削減、製作工数の削減につながり、この結果低価格の骨伝導受話装置が実現できる。   In the receiver of the present invention, the bone conduction speaker and the covering member of the band member can all be made of the same flexible material, and can be integrally formed with one mold, thereby reducing the number of parts and the number of manufacturing steps. As a result, a low-cost bone conduction receiver can be realized.

本発明による第４の発明は、圧電素子を可とう性部材で被覆してなる圧電素子の振動を利用して音響振動を発生する骨伝導スピーカであって、前記骨伝導スピーカは、端部に外耳道に挿入可能な耳栓を具備し、前記耳栓は前記圧電素子と機械的に結合され、耳珠近傍に圧接することを特徴とする受話装置である。   According to a fourth aspect of the present invention, there is provided a bone conduction speaker that generates acoustic vibration using vibration of a piezoelectric element formed by coating a piezoelectric element with a flexible member, and the bone conduction speaker is provided at an end portion. The earpiece includes an earplug that can be inserted into an external ear canal, and the earplug is mechanically coupled to the piezoelectric element and press-contacted in the vicinity of the tragus.

本発明の受話装置によれば、音響振動を発生する骨伝導スピーカと、外耳道に挿入可能な耳栓からなり、前記骨伝導スピーカ部の端部は、前記耳栓と機械的に結合され、耳珠近傍に圧接する構造を採用したため、周囲の騒音を遮断した状態で音声が明瞭に聴取できる受話装置が得られる。   According to the receiver of the present invention, the bone conduction speaker that generates acoustic vibrations and the earplug that can be inserted into the external auditory canal are mechanically coupled to the earplug. Since a structure that presses in the vicinity of the bead is adopted, a receiver that can clearly hear the sound in a state where the surrounding noise is cut off can be obtained.

本発明による第５の発明は、第４の発明において前記骨伝導スピーカが、棒状を成し、長手方向端部が、前記耳栓と連結されていることを特徴とする受話装置である。本発明の骨伝導スピーカは棒状であり、長手方向端部が、前記耳栓と連結されているシンプルな構成のため、装着時の違和感、疲労感を軽減できるとともに、部品点数を大幅に削減でき、量産性に富み、低価格での提供を実現できる。   According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the bone conduction speaker has a rod shape, and a longitudinal end portion is connected to the ear plug. The bone conduction speaker of the present invention has a rod-like shape and has a simple structure in which the longitudinal end is connected to the earplug, so that it is possible to reduce a sense of incongruity and fatigue at the time of wearing, and to greatly reduce the number of parts. It is rich in mass productivity and can be offered at a low price.

本発明による第６の発明は、第４の発明または第５の発明において、前記耳栓が弾性材料で構成され、その弾性力で外耳道を塞ぐ構造を有することを特徴とする受話装置である。   A sixth invention according to the present invention is the receiver according to the fourth or fifth invention, wherein the earplug is made of an elastic material and has a structure for closing the ear canal with the elastic force.

前記の如く、本発明によれば、音質的に優れ、変換効率が高く、軽量で装着時の違和感や疲労感を軽減できる装着性のよい、低価格な、骨導式の受話装置あるいは、高騒音環境下においても、音声が明瞭に聴取でき、軽量で装着性の良い骨導式の受話装置の提供が可能となる。   As described above, according to the present invention, a low cost, bone-conducting earpiece or a high-cost, high-conversion efficiency, light weight, good wearability that can reduce discomfort and fatigue when worn, Even in a noisy environment, it is possible to provide a bone-conducted receiving device that can hear sound clearly, is lightweight, and has good wearability.

本発明による受話装置は、骨伝導スピーカとバンド部材とからなる。前記骨伝導スピーカは圧電素子の逆圧電効果を利用し、電気音響信号を機械音響振動に変換するスピーカを使用する。前記骨伝導スピーカは柱状に形成し、一端に鍵状の突起を設ける。前記バンド部材は、両耳近傍と顎の下方近傍を結ぶ様な円弧形状にし、両端に前記骨伝導スピーカを配置する。   The receiver according to the present invention includes a bone conduction speaker and a band member. The bone conduction speaker uses a speaker that converts an electroacoustic signal into a mechanical acoustic vibration by using an inverse piezoelectric effect of a piezoelectric element. The bone conduction speaker is formed in a columnar shape and is provided with a key-like protrusion at one end. The band member has an arc shape that connects the vicinity of both ears and the vicinity of the lower part of the chin, and the bone conduction speaker is disposed at both ends.

前記バンド部材は、前記骨伝導スピーカの前記突起を耳珠もしくは耳甲介腔部の前部軟骨に押圧し、且つ掛止される程度の弾性を持たせる。この弾性による弾性力は、前記バンド部材の円弧形状の両端を円弧面内で両端を遠ざけるような外力を加えた際に元に戻ろうとする力が働き前記骨伝導スピーカを一定の圧力で耳珠もしくは耳甲介腔部の前部軟骨に押圧するように設定することが望ましい。   The band member is elastic enough to press the projection of the bone conduction speaker against the tragus or the front cartilage of the concha cavity and to be hooked. The elastic force due to this elasticity is such that when an external force is applied to move both ends of the arc shape of the band member away from each other within the arc surface, the force to return the band member to the original works, and the bone conduction speaker is moved to the tragus with a constant pressure. Or it is desirable to set so as to press against the front cartilage of the concha cavity.

以下、本発明による受話装置の実施例について図面を参照しながら具体的に説明する。   Hereinafter, embodiments of a receiver according to the present invention will be specifically described with reference to the drawings.

（実施例１）
図３は、実施例１による受話装置の斜視図である。バンド部材１２は、耳近傍と顎の下方近傍を結ぶように円弧形状を成し、その両端部に骨伝導スピーカ１１を配置した。骨伝導スピーカ１１の端部には鍵状の突起１７を設けた。骨伝導スピーカ１１に音響振動を発生させるための電気音響信号は、プラグ１６から接続コード１５を経由して骨伝導スピーカ１１に供給される。 Example 1
FIG. 3 is a perspective view of the receiver according to the first embodiment. The band member 12 has an arc shape so as to connect the vicinity of the ear and the vicinity of the lower part of the chin, and the bone conduction speaker 11 is disposed at both ends thereof. A key-like protrusion 17 is provided at the end of the bone conduction speaker 11. An electroacoustic signal for generating acoustic vibration in the bone conduction speaker 11 is supplied from the plug 16 to the bone conduction speaker 11 via the connection cord 15.

図４は、実施例１による受話装置の使用状態を示す説明図である。骨伝導スピーカ１１の端部に設けた鍵状の突起１７を耳珠１４もしくは耳甲介腔部１３の前部軟骨に掛止することで骨伝導スピーカ１１が外れることなく、耳珠１４近傍に押圧され、発生する音響振動を耳珠近傍の軟骨及び顔面の骨組織に伝達させることができる。   FIG. 4 is an explanatory diagram illustrating a usage state of the receiver according to the first embodiment. A key-like protrusion 17 provided at the end of the bone conduction speaker 11 is hooked on the tragus 14 or the front cartilage of the concha cavity 13 so that the bone conduction speaker 11 does not come off and is in the vicinity of the tragus 14. The acoustic vibration generated when pressed is transmitted to the cartilage near the tragus and the bone tissue of the face.

本実施例１では、バンド部材１２にショア硬度９０度の液状ポリウレタンゴムを硬化させた樹脂を用いてバンド部材１２そのものに弾性を持たせた。この弾性は、バンド部材１２の２つある端部１８をそれぞれ矢印１９の方向へ広げるような引っ張り力を加えて、骨伝導スピーカ１１を両耳の耳珠近傍に装着し、前記引っ張り力を解放すると、バンド部材の弾性力が矢印２０の方向に働き、骨伝導スピーカ１１を耳珠１４近傍に押圧する押圧力となる。   In the first embodiment, the band member 12 itself is made elastic by using a resin obtained by curing a liquid polyurethane rubber having a Shore hardness of 90 degrees for the band member 12. This elasticity applies a pulling force that spreads the two end portions 18 of the band member 12 in the direction of the arrow 19, and the bone conduction speaker 11 is mounted near the tragus of both ears to release the pulling force. As a result, the elastic force of the band member acts in the direction of the arrow 20, and the pressing force presses the bone conduction speaker 11 near the tragus 14.

図５は、実施例１による伝導スピーカの断面図である。実施例１に使用した骨伝導スピーカは、矩形の圧電セラミック板２２を同形状の金属板からなるシム２１の両面に貼り付けた構造を成す、圧電バイモルフ素子２４の全体を、可とう性部材にて覆い、被覆層２３を設けた構造とした。この圧電バイモルフ素子２４は、片方の圧電セラミック板２２が長手方向に伸張するとき、他方は長手方向に伸縮するように、電圧が印加されて、撓み振動が発生する様に構成され、電気音響信号を機械音響振動に変換する骨伝導スピーカである。   FIG. 5 is a cross-sectional view of the conductive speaker according to the first embodiment. The bone conduction speaker used in Example 1 has a structure in which a rectangular piezoelectric ceramic plate 22 is attached to both sides of a shim 21 made of a metal plate of the same shape, and the entire piezoelectric bimorph element 24 is used as a flexible member. Thus, the cover layer 23 is provided. The piezoelectric bimorph element 24 is configured such that when one piezoelectric ceramic plate 22 expands in the longitudinal direction, a voltage is applied so that the other expands and contracts in the longitudinal direction, and flexural vibration is generated. Is a bone conduction speaker that converts the sound into mechanical acoustic vibration.

圧電セラミック板２２は、主に圧電の横効果を利用して、長手方向（図５においては左右方向）の変位を発生するものである。圧電セラミック板２２は矩形で厚み方向に分極されており、上下面に印加される電気信号に応じて伸縮の変形を生じる。また、厚み方向に積層した構成で、一層毎に電極を二つのグループに分けて各層毎に分極と電圧印加が出来る構成をとると駆動電圧を大幅に低減できる利点がある。なお、電気的な結線は図示しない。   The piezoelectric ceramic plate 22 generates displacement in the longitudinal direction (left-right direction in FIG. 5) mainly using the piezoelectric lateral effect. The piezoelectric ceramic plate 22 is rectangular and polarized in the thickness direction, and causes expansion and contraction in accordance with electric signals applied to the upper and lower surfaces. In addition, the configuration in which the electrodes are divided into two groups for each layer and the polarization and voltage application can be applied to each layer has an advantage that the driving voltage can be greatly reduced by stacking in the thickness direction. Electrical connections are not shown.

圧電バイモルフ素子２４の作製方法は、次のとおりである。２枚の圧電セラミック板２２にはＮＥＣトーキン（株）製の圧電セラミック板を用い、その寸法は、長さ３０ｍｍ、幅３ｍｍ、厚さ０．２ｍｍとした。また、シム２１は厚さ５０μｍの真鍮製であり、その長さと幅は圧電セラミック板とほぼ同寸法である。これらをエポキシ系接着剤で貼り合わせ、圧電セラミック板の外側の主面には電極を設け、この電極とシム２１からリード線を引き出す構造とした。   The method for producing the piezoelectric bimorph element 24 is as follows. The piezoelectric ceramic plates made by NEC TOKIN Corporation were used for the two piezoelectric ceramic plates 22, and the dimensions were 30 mm in length, 3 mm in width, and 0.2 mm in thickness. The shim 21 is made of brass having a thickness of 50 μm, and its length and width are substantially the same as those of the piezoelectric ceramic plate. These were bonded together with an epoxy adhesive, and an electrode was provided on the outer main surface of the piezoelectric ceramic plate, and a lead wire was drawn from this electrode and shim 21.

圧電セラミック板２２は厚み方向に積層した構成で、一層毎に電極を二つのグループに分けて各層毎に分極と電圧印加が出来る構成にすると、駆動電圧を大幅に低減できる利点がある。本実施例では、５０μｍの層を４層に積層した一体焼成構造の圧電セラミック板を用いており、二枚の圧電セラミック板は並列に電気接続されたものを用いている。   The piezoelectric ceramic plate 22 has a structure in which the electrodes are laminated in the thickness direction. If the structure is such that the electrodes are divided into two groups for each layer and polarization and voltage can be applied to each layer, there is an advantage that the driving voltage can be greatly reduced. In this embodiment, a piezoelectric ceramic plate having an integrally fired structure in which four 50 μm layers are stacked is used, and the two piezoelectric ceramic plates are electrically connected in parallel.

次に、真鍮製の金型を用いて圧電バイモルフ素子２４の全面に液状ウレタンゴムを流し込み、硬化処理により、厚さ方向の二面に２ｍｍの厚さで被覆層２３を形成した。この被覆層２３の厚さによって骨伝導スピーカとしての共振周波数と振動体の共振の先鋭度Ｑを調節することができる。   Next, liquid urethane rubber was poured over the entire surface of the piezoelectric bimorph element 24 using a brass mold, and a coating layer 23 having a thickness of 2 mm was formed on two surfaces in the thickness direction by a curing process. The resonance frequency as the bone conduction speaker and the sharpness Q of resonance of the vibrating body can be adjusted by the thickness of the covering layer 23.

このようにして得た骨伝導スピーカをアルミ製のバンド部材の両端にエポキシ系接着剤を用いて長手方向の端部で接合固定し、本実施の形態の受話装置を得た。同様にして、骨伝導スピーカとバンド部材を一体で成形した場合についても実施したが、使用感、音響性能に差はなく、本実施例１の受話装置を効率的に生産できることが確認できた。本実施例１の受話装置に７Ｖｒｍｓ程度の電気音響信号を入力して、耳珠近傍より振動を受けると、明瞭で十分な音量感で音楽や音声情報を聴き取ることが可能であることを確認した。また、本実施例で得られた受話装置は重量が僅か１５ｇであり、使用者への負担が軽いことも確認できた。   The bone conduction speaker thus obtained was bonded and fixed at both ends of the aluminum band member using an epoxy adhesive at the ends in the longitudinal direction, thereby obtaining the receiver of the present embodiment. Similarly, although the case where the bone conduction speaker and the band member were formed integrally was carried out, there was no difference in feeling of use and acoustic performance, and it was confirmed that the receiver of the first embodiment could be produced efficiently. Confirm that it is possible to listen to music and audio information with a clear and sufficient volume feeling when an electroacoustic signal of about 7 Vrms is input to the receiver of the first embodiment and vibration is received from the vicinity of the tragus. did. In addition, the receiving device obtained in this example weighs only 15 g, and it has been confirmed that the burden on the user is light.

（実施例２）
図６は、実施例２による受話装置の斜視図である。実施例２は、２つの骨伝導スピーカ１１を接続コード１５でプラグ１６に接続する構造とした。骨伝導スピーカ１１は、実施例１に使用した圧電バイモルフ素子２４の全面に液状ウレタンゴムを流し込み、硬化処理により、厚さ方向の二面に２ｍｍの厚さで被覆層を形成すると同時に突起１７を設けた。 (Example 2)
FIG. 6 is a perspective view of a receiver according to the second embodiment. In Example 2, two bone conduction speakers 11 are connected to the plug 16 by the connection cord 15. In the bone conduction speaker 11, liquid urethane rubber is poured over the entire surface of the piezoelectric bimorph element 24 used in Example 1, and a coating layer is formed with a thickness of 2 mm on two surfaces in the thickness direction by a curing process. Provided.

プラグ１６は、市販されているオーディオ用のステレオプラグを用い、圧電バイモルフ素子２４に電気音響信号を入力できる様に接続コード１５で接続した。   The plug 16 is a stereo plug for audio that is commercially available, and is connected by a connection cord 15 so that an electroacoustic signal can be input to the piezoelectric bimorph element 24.

図７は、実施例２による受話装置の使用状態を示す説明図である。前記突起１７は、耳珠１４もしくは耳甲介腔部１３の前部軟骨部に図７に示すように骨伝導スピーカ１１が掛止可能な形状とした。また、突起１７は弾性を持つので、図６に示す矢印１０の方向に数ｍｍ動き、耳珠近傍を挟持部９で挟めるような構造にした。このような構造にすることで、図７に示すように、骨伝導スピーカ１１を耳珠１４近傍に特に良好に密着させることが可能となる。   FIG. 7 is an explanatory diagram illustrating a usage state of the receiver according to the second embodiment. The protrusion 17 has a shape that allows the bone conduction speaker 11 to be hooked on the tragus 14 or the front cartilage portion of the concha cavity portion 13 as shown in FIG. Further, since the protrusion 17 has elasticity, it has a structure that moves several mm in the direction of the arrow 10 shown in FIG. By adopting such a structure, as shown in FIG. 7, the bone conduction speaker 11 can be brought into close contact particularly close to the tragus 14.

本実施例２の受話装置に７Ｖｒｍｓ程度の電気音響信号を入力して、耳珠近傍より振動を受けると、実施例１と同様に、明瞭で十分な音量感で音楽や音声情報を聴き取ることできた。   When an electroacoustic signal of about 7 Vrms is inputted to the receiver of the second embodiment and vibration is received from the vicinity of the tragus, music and voice information can be heard with a clear and sufficient volume feeling as in the first embodiment. did it.

本実施例２ではステレオ効果を得るために骨伝導スピーカ１１を２つ使用したが、モノラル用として骨伝導スピーカ１１を１つとしても良い。また、突起１７の構造は、耳珠もしくは耳甲介腔部の前部軟骨部に骨伝導スピーカ１１が掛止可能な形状であればよく、装着を考慮し形状は適宜設計すればよい。   In the second embodiment, two bone conduction speakers 11 are used to obtain a stereo effect, but one bone conduction speaker 11 may be used for monaural use. Further, the structure of the protrusion 17 may be any shape that allows the bone conduction speaker 11 to be hooked on the tragus or the front cartilage portion of the concha cavity, and the shape may be appropriately designed in consideration of mounting.

本実施例１及び２では、圧電素子として、矩形板状の圧電バイモルフを用いたが、圧電ユニモルフの使用も可能であり、形状も矩形板状に限らず、円形、楕円形状あるいは多角形状の一般の圧電振動体であってよい。さらに、圧電バイモルフを複数段重ね、それぞれ同方向に駆動するように結線することにより、大きな音量が得られる受話装置となる。   In the first and second embodiments, a piezoelectric bimorph having a rectangular plate shape is used as the piezoelectric element. However, a piezoelectric unimorph can also be used, and the shape is not limited to the rectangular plate shape. The piezoelectric vibration member may be used. Furthermore, a plurality of stages of piezoelectric bimorphs are stacked and connected so as to be driven in the same direction, thereby providing a receiver that can obtain a large volume.

（実施例３）
図８は、実施例３による受話装置の斜視図である。実施例３では、実施例１に用いた骨伝導スピーカ１１の先端に鍵状の突起に換えて、耳栓３１を設け、実施例２と同様に２つの骨伝導スピーカ１１を接続コード１５でプラグに接続する構造とした。図８にはプラグは図示しない。耳栓３１は発泡ポリウレタンで製作し、骨伝導スピーカ１１の長手方向の端部にウレタンゴム用の化学反応形接着剤を用いて接着固定した。 (Example 3)
FIG. 8 is a perspective view of a receiver according to the third embodiment. In the third embodiment, an earplug 31 is provided at the tip of the bone conduction speaker 11 used in the first embodiment in place of the key-shaped protrusion, and the two bone conduction speakers 11 are plugged with the connection cord 15 as in the second embodiment. To connect to. The plug is not shown in FIG. The earplug 31 was made of foamed polyurethane, and was bonded and fixed to the end portion in the longitudinal direction of the bone conduction speaker 11 using a chemically reactive adhesive for urethane rubber.

実施例３による受話装置は、実施例１及び実施例２と違い、耳栓３１を外耳道に挿入する構造となっているため、周囲の騒音を遮断する。図９は、実施例３による受話装置の使用状態を示す説明図である。この骨伝導スピーカ１１は、耳珠１４の近傍に接触し、発生した音声振動が耳珠１４近傍の軟骨及び顔面の骨組織に伝わり、音声情報を聴取できる。耳栓３１は、外耳道の形に応じて自由に変形するため、外耳道に密着し周囲の騒音を遮断する。同時に本実施例３の骨伝導型の受話装置に７Ｖｒｍｓ程度の音声信号を入力することで骨伝導スピーカ１１が振動し、耳珠１４近傍よりこの振動を受けると、明瞭で十分な音量感で音楽や音声情報を聴き取ることが可能であることが確認できた。また、本実施例３で得られた骨伝導受話装置は重量が僅かに１５ｇであり使用者への負担が軽いことも確認できた。   Unlike the first and second embodiments, the receiving device according to the third embodiment has a structure in which the earplug 31 is inserted into the external auditory canal, thereby blocking ambient noise. FIG. 9 is an explanatory diagram of a usage state of the receiver according to the third embodiment. The bone conduction speaker 11 comes into contact with the vicinity of the tragus 14, and the generated voice vibration is transmitted to the cartilage and facial bone tissue in the vicinity of the tragus 14 so that the voice information can be heard. Since the earplug 31 freely deforms according to the shape of the ear canal, it closely contacts the ear canal and blocks ambient noise. At the same time, by inputting an audio signal of about 7 Vrms to the bone conduction type receiver of the third embodiment, the bone conduction speaker 11 vibrates. When this vibration is received from the vicinity of the tragus 14, music with a clear and sufficient volume feeling is obtained. It was confirmed that it was possible to listen to sound information. It was also confirmed that the bone conduction receiver obtained in Example 3 weighs only 15 g and the burden on the user is light.

以上の実施の形態では、圧電振動体としては矩形板状の圧電バイモルフを用いたが、圧電ユニモルフの使用も可能であり、形状も矩形板状に限らず、円形、楕円形状あるいは多角形状の一般の圧電振動体であってよい。さらに、圧電バイモルフを複数段重ね、それぞれ同方向に駆動するように結線することにより、大きな音量が得られる。   In the above embodiment, a rectangular plate-shaped piezoelectric bimorph is used as the piezoelectric vibrator. However, a piezoelectric unimorph can be used, and the shape is not limited to the rectangular plate shape, and a general shape of a circle, an ellipse, or a polygon is used. The piezoelectric vibration member may be used. Further, a large volume can be obtained by stacking a plurality of piezoelectric bimorphs and connecting them so as to be driven in the same direction.

上記の如く、本発明によれば、音質的に優れ、変換効率が高く、軽量で装着時の違和感や疲労感を軽減できる装着性のよい、低価格な骨導式の受話装置、或いは、高騒音環境下においても、音声が明瞭に聴取でき、軽量で装着性の良い骨導式の受話装置の提供が可能となる。   As described above, according to the present invention, a low-priced bone-conducted earpiece that is excellent in sound quality, has high conversion efficiency, is lightweight, has good wearability that can reduce discomfort and fatigue when worn, or high Even in a noisy environment, it is possible to provide a bone-conducted receiving device that can hear sound clearly, is lightweight, and has good wearability.

本発明は、骨伝導スピーカを用いた受話装置として、難聴者向けの補聴器や助聴器として利用できるほか、一般のオーディオ機器、音響機器に使用できるヘッドホンとして利用できる。   INDUSTRIAL APPLICABILITY The present invention can be used as a hearing device using a bone conduction speaker as a hearing aid or a hearing aid for a hearing impaired person, or as a headphone that can be used for general audio equipment or acoustic equipment.

従来の骨伝導ヘッドセットを示す説明図。Explanatory drawing which shows the conventional bone conduction headset. 従来の骨伝導スピーカを用いた受話装置を示す説明図。Explanatory drawing which shows the receiver which used the conventional bone-conduction speaker. 実施例１による受話装置の斜視図。1 is a perspective view of a receiver according to Embodiment 1. FIG. 実施例１による受話装置の使用状態を示す説明図。Explanatory drawing which shows the use condition of the telephone receiver by Example 1. FIG. 実施例１による伝導スピーカの断面図。1 is a cross-sectional view of a conduction speaker according to Embodiment 1. FIG. 実施例２による受話装置の斜視図。FIG. 6 is a perspective view of a receiver according to a second embodiment. 実施例２による受話装置の使用状態を示す説明図。Explanatory drawing which shows the use condition of the telephone receiver by Example 2. FIG. 実施例３による受話装置の斜視図。FIG. 10 is a perspective view of a receiver according to a third embodiment. 実施例３による受話装置の使用状態を示す説明図。Explanatory drawing which shows the use condition of the receiver according to Example 3.

符号の説明Explanation of symbols

１ 骨伝導ヘッドセット
２ ヘッドバンド
３ スピーカ
４ 固定部材
５ 受話装置
６ 耳垂
７，１１ 骨伝導スピーカ
８ クリップ
９ 挟持部
１１ 骨伝導スピーカ
１２ バンド部材
１３ 耳甲介腔部
１４ 耳珠
１５ 接続コード
１６ プラグ
１７ 突起
１８ 端部
１０，１９，２０ 矢印
２１ シム
２２ 圧電セラミック板
２３ 被覆層
２４ 圧電バイモルフ素子
３１ 耳栓 DESCRIPTION OF SYMBOLS 1 Bone conduction headset 2 Headband 3 Speaker 4 Fixing member 5 Earpiece 6 Ear lobe 7, 11 Bone conduction speaker 8 Clip 9 Clamping part 11 Bone conduction speaker 12 Band member 13 Concha cavity part 14 Tragus 15 Connection cord 16 Plug 17 Protrusion 18 End 10, 19, 20 Arrow 21 Shim 22 Piezoelectric Ceramic Plate 23 Covering Layer 24 Piezoelectric Bimorph Element 31 Earplug

Claims (6)

圧電素子を可とう性部材で被覆してなる圧電素子の振動を利用して音響振動を発生する骨伝導スピーカであって、前記骨伝導スピーカが耳珠もしくは耳甲介腔部の前部軟骨部に掛止可能な形状の突起部を有することを特徴とする受話装置。   A bone conduction speaker that generates acoustic vibration using vibration of a piezoelectric element formed by coating a piezoelectric element with a flexible member, wherein the bone conduction speaker is an anterior trachea or an anterior cartilage portion of a concha cavity A receiving device having a protruding portion that can be hooked onto the phone. 請求項1記載の受話装置において、前記骨伝導スピーカがバンド部材の少なくとも一端部に配されてなり、前記骨伝導スピーカが耳珠近傍に押圧されるよう付勢されていることを特徴とする受話装置。   2. The receiving device according to claim 1, wherein the bone conduction speaker is arranged at least at one end of a band member, and the bone conduction speaker is biased to be pressed near the tragus. apparatus. 請求項２記載の受話装置において、前記圧電素子と前記バンド部材は、一体となるよう可とう性部材で成形されてなることを特徴とする受話装置。   3. The receiving device according to claim 2, wherein the piezoelectric element and the band member are formed of a flexible member so as to be integrated. 圧電素子を可とう性部材で被覆してなる圧電素子の振動を利用して音響振動を発生する骨伝導スピーカであって、前記骨伝導スピーカは、端部に外耳道に挿入可能な耳栓を具備し、前記耳栓は前記圧電素子と機械的に結合され、耳珠近傍に圧接することを特徴とする受話装置。   A bone conduction speaker that generates acoustic vibration using vibration of a piezoelectric element formed by coating a piezoelectric element with a flexible member, the bone conduction speaker having an earplug that can be inserted into an external auditory canal at an end. The earplug is mechanically coupled to the piezoelectric element and press-contacted in the vicinity of the tragus. 前記骨伝導スピーカは、棒状を成し、長手方向端部が、前記耳栓と連結されていることを特徴とする請求項４に記載の受話装置。   The earpiece according to claim 4, wherein the bone conduction speaker has a rod shape, and a longitudinal end portion thereof is connected to the earplug. 前記耳栓は弾性材料で構成され、その弾性力で外耳道を塞ぐ構造を特徴とする請求項４または請求項５のいずれかに記載の受話装置。   The earpiece according to claim 4, wherein the earplug is made of an elastic material, and has a structure that closes the ear canal with the elastic force.
JP2005352126A 2005-11-18 2005-12-06 Earphone device Pending JP2007165938A (en)

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