JP2012028852A - Ear hole type bone conduction receiver usable as earphone for able-bodied person - Google Patents

Ear hole type bone conduction receiver usable as earphone for able-bodied person Download PDF

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JP2012028852A
JP2012028852A JP2010162916A JP2010162916A JP2012028852A JP 2012028852 A JP2012028852 A JP 2012028852A JP 2010162916 A JP2010162916 A JP 2010162916A JP 2010162916 A JP2010162916 A JP 2010162916A JP 2012028852 A JP2012028852 A JP 2012028852A
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piezoelectric vibrator
bone conduction
ear hole
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JP5685771B2 (en
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Toru Kato
透 加藤
Kiyota Oshino
喜代太 押野
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WECOM KENKYUSHO KK
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Abstract

PROBLEM TO BE SOLVED: To provide an ear hole type bone conduction receiver which can be used as an earphone for an able-bodied person.SOLUTION: An ear hole type bone conduction receiver which can be used as an earphone for an able-bodied person includes: a plate-formed piezoelectric vibrator; a signal line for transmitting an electric signal to the piezoelectric vibrator; a front case which is a housing on the side to transmit the vibration of the piezoelectric vibrator and which has a shape for covering the piezoelectric vibrator; a pressing force room which is partitioned and sealed by the front case and the piezoelectric vibrator; a rear cover which is on the opposite side to the side for transmitting the vibration of the piezoelectric vibrator and which has a shape for covering the piezoelectric vibrator; a cylindrical pipe extending vertically in relation to the surface of the piezoelectric vibrator and having a small hole in the center while an outer part of its tip has a shape suitable for being inserted into an ear hole.

Description

本発明は、耳穴式骨伝導レシーバ、すなわち人体の耳穴（外耳道のうち耳介に近いあたり）に挿入して用いる骨伝導レシーバに関し、とりわけ、健常者のイヤフォンとしても使用できるそれに関する。   The present invention relates to an ear hole type bone conduction receiver, that is, a bone conduction receiver used by being inserted into an ear hole of a human body (around the pinna in the external auditory canal), and more particularly to that which can be used as an earphone of a healthy person.

特許文献１には、耳穴装着に適した骨伝導レシーバが開示されている。圧電振動子と、それを覆うベース、ウェイトカバーと、制振ダンパーと、ベースの中央部に設けられ垂直に延びるロッドと、その先端に設けられたイヤーピースとからなる。圧電振動子の中心をベースに当接せしめる。ベースの周辺部を薄くしてエッジ部を設ける。ロッドに音波誘導孔を設ける。音波誘導孔に開閉チューブを設ける。ウェイトカバーは、所定の重量を持つ。接着又は圧接により、圧電振動子の中心をベースに当接せしめる。圧電振動子は円板状又は長方形の形状の電極板の表面にＰＺＴ（チタン酸ジルコン酸鉛重合体）の薄膜を形成してなる。   Patent Document 1 discloses a bone conduction receiver that is suitable for mounting on an ear hole. A piezoelectric vibrator, a base covering the same, a weight cover, a damping damper, a rod provided at the center of the base and extending vertically, and an ear piece provided at the tip thereof. The center of the piezoelectric vibrator is brought into contact with the base. The edge of the base is thinned to provide an edge. A sound wave guide hole is provided in the rod. An open / close tube is provided in the sound wave guide hole. The weight cover has a predetermined weight. The center of the piezoelectric vibrator is brought into contact with the base by adhesion or pressure contact. The piezoelectric vibrator is formed by forming a thin film of PZT (lead zirconate titanate polymer) on the surface of a disk-shaped or rectangular electrode plate.

特許文献２には、軟骨伝導スピーカが開示されている。電極板の表裏両面にＰＺＴ（チタン酸ジルコン酸鉛重合体）の薄膜を形成してなる２枚の圧電振動子と、該２枚の圧電振動子を互いに平行に所定の間隔を保ちつつその周辺を連結するスペーサと、前記２枚の圧電振動子に互いに逆動作させるべく、二つの極性を持つ電気信号のうち、一方を前記圧電振動子の電極板に、もう一方を前記圧電振動子のＰＺＴ薄膜部分に伝える導線と、前記２枚の圧電振動子のうち、一方を弾性部材を介して使用者の耳近傍の軟骨に接触させる接触パッドからなるものである。   Patent Document 2 discloses a cartilage conduction speaker. Two piezoelectric vibrators formed by forming a thin film of PZT (lead zirconate titanate polymer) on both the front and back sides of the electrode plate, and the two piezoelectric vibrators while maintaining a predetermined interval in parallel with each other In order to cause the two piezoelectric vibrators to operate in reverse to each other, one of the two polar electrical signals is applied to the electrode plate of the piezoelectric vibrator and the other is applied to the PZT of the piezoelectric vibrator. It consists of a conductive wire for transmitting to the thin film portion and a contact pad for contacting one of the two piezoelectric vibrators with the cartilage near the user's ear via an elastic member.

特開２０１０−０８７８１０号公報JP 2010-087810 A 特開２００８−１４８０８６号公報JP 2008-148086 A

本発明の発明者は、２年前に特許文献１の発明を行った。耳穴装着に適した骨伝導レシーバである。耳穴近傍の軟骨に音を伝導させることを実現したものであった。
その後、本発明の発明者は、耳穴に装着することが、本来健常者用のイヤフォン、すなわち、気道を通じて空気振動により鼓膜に音を伝達させるイヤフォンに適した構造であることに鑑み、骨伝導と健常者用のイヤフォンとを兼用する構造を提供できないかと、思案をめぐらした。その結果、一つの解決策を見出したものである。
本発明の目的は、健常者のイヤフォンとしても使用できる耳穴式骨伝導レシーバを提供することにある。 The inventor of the present invention invented Patent Document 1 two years ago. It is a bone conduction receiver that is suitable for ear hole attachment. It was realized to conduct sound to the cartilage near the ear hole.
Thereafter, the inventor of the present invention considers that bone conduction is considered in view of the fact that attaching to the ear hole is a structure suitable for an earphone for a healthy person, that is, an earphone that transmits sound to the eardrum by air vibration through the airway. I wondered if I could provide a structure that could also be used as an earphone for healthy people. As a result, we have found one solution.
An object of the present invention is to provide an ear hole type bone conduction receiver that can be used as an earphone of a healthy person.

本発明に係る耳穴式骨伝導レシーバは、板状の圧電振動子と、該圧電振動子に電気信号を伝える信号線と、前記圧電振動子の振動を伝える側の筐体であり、前記圧電振動子を覆う形状をしたフロントケースと、該フロントケースと前記圧電振動子とにより仕切られ、密閉されてなる圧力部屋と、前記圧電振動子の振動を伝える側とは反対側の筐体であり、前記圧電振動子を覆う形状をしたリアカバーと、前記フロントケースの中央部に設けられ、前記圧電振動子の面に対して垂直に伸び、中心部に小穴を有し、先端部の外部が耳穴挿入に適した形状を有する円筒状のパイプと、からなる。
前記圧電振動子の周縁部を前記フロントケース内側に当接せしめ、密封することにより前記圧力部屋を形成する。
前記圧電振動子のリヤカバーに近い側の中央部分に音調ウエイトを設ける。
前記圧電振動子のリヤカバーに近い側の面全体に制振塗料を塗った面を設ける。
前記パイプの中心部に設けた小穴は、直径が０．５ミリ以上１．０ミリ以下であり、長さが１０ミリ以上１５ミリ以下である。
前記圧電振動子は、電極版の表面にＰＺＴ（チタン酸ジルコン酸鉛重合体）の薄膜を形成してなるものである。 The ear hole type bone conduction receiver according to the present invention is a plate-like piezoelectric vibrator, a signal line for transmitting an electrical signal to the piezoelectric vibrator, and a casing on a side for transmitting the vibration of the piezoelectric vibrator. A front case having a shape covering the child, a pressure chamber partitioned and sealed by the front case and the piezoelectric vibrator, and a casing opposite to the side transmitting the vibration of the piezoelectric vibrator, A rear cover shaped to cover the piezoelectric vibrator, and provided at the center of the front case, extending perpendicular to the surface of the piezoelectric vibrator, having a small hole in the center, and inserting an ear hole outside the tip And a cylindrical pipe having a shape suitable for.
The pressure chamber is formed by bringing a peripheral portion of the piezoelectric vibrator into contact with the inside of the front case and sealing it.
A tone weight is provided at the central portion of the piezoelectric vibrator close to the rear cover.
A surface coated with a damping paint is provided on the entire surface of the piezoelectric vibrator close to the rear cover.
The small hole provided in the central portion of the pipe has a diameter of 0.5 mm to 1.0 mm and a length of 10 mm to 15 mm.
The piezoelectric vibrator is formed by forming a thin film of PZT (lead zirconate titanate polymer) on the surface of an electrode plate.

本発明の耳穴式骨伝導レシーバは、以上のように構成されているから、圧力部屋の働きにより音質の改善がなされた。圧電振動子を音響周波数の信号電圧を加えて振動させたとき、周波数と振幅の大小に応じ圧力部屋において圧力の変化が生ずる。その圧力は振動子に振動と逆方向に力を与えクッションの働きを生ずる。したがって、圧電振動子にダンパー作用と寄生振動防止用の制振作用が期待できる。
さらに圧電振動子に音調ウエイトを取り付けることにより、周波数の低減のレベルアップすることができる。
圧力部屋正面に小穴をもつパイプを設けて、圧力変化の音響出力を通常イヤフォン（気道を通じて空気振動により鼓膜をふるわすイヤフォン）に取り出せる。
そして、圧力部屋正面の振動をパイプを通じて取り出し、骨伝導イヤフォンとしても機能する。 Since the ear hole type bone conduction receiver of the present invention is configured as described above, the sound quality is improved by the action of the pressure chamber. When the piezoelectric vibrator is vibrated by applying a signal voltage having an acoustic frequency, a pressure change occurs in the pressure chamber according to the frequency and amplitude. The pressure gives a force to the vibrator in the opposite direction to the vibration, and acts as a cushion. Therefore, the piezoelectric vibrator can be expected to have a damper action and a damping action for preventing parasitic vibration.
Further, by attaching a tone weight to the piezoelectric vibrator, the level of frequency reduction can be increased.
By providing a pipe with a small hole in front of the pressure chamber, the acoustic output of the pressure change can be taken out to a normal earphone (an earphone that shakes the eardrum by air vibration through the airway).
The vibration in the front of the pressure chamber is taken out through the pipe and functions as a bone conduction earphone.

図１は、耳穴式骨伝導レシーバの構造を示す図である。図１（ａ）は、背面外観（リカーカバー側から見た外観）を示す図である。図１（ｂ）は、振動伝達方向で切った断面図である（実施形態）。FIG. 1 is a diagram showing a structure of an ear hole type bone conduction receiver. Fig.1 (a) is a figure which shows a back external appearance (appearance seen from the liquor cover side). FIG. 1B is a cross-sectional view taken along the vibration transmission direction (embodiment). 図２は、耳穴式骨伝導レシーバの構造を実施例について示す図である。図２（ａ）は、振動伝達方向の断面図である。図２（ｂ）は、背面外観である。（実施例１）。FIG. 2 is a diagram showing the structure of the ear hole type bone conduction receiver according to the embodiment. FIG. 2A is a cross-sectional view in the vibration transmission direction. FIG. 2B is a rear appearance. (Example 1).

本発明に係る耳穴式骨伝導レシーバの形状及び構造に関する。板状の圧電振動子（電気信号を音声信号に変換する圧電セラミックス振動子）を用いて骨伝導レシーバを提供できることは、特許文献１及び２に開示されている。耳穴式骨伝導レシーバについては、特許文献１にて開示した。本発明では、骨伝導のみならず、気道を介した鼓膜振動をも実現し、従来の音響イヤフォンの機能をも併せ持つ骨伝導レシーバについて開示するものである。   The present invention relates to the shape and structure of an ear hole type bone conduction receiver according to the present invention. Patent Documents 1 and 2 disclose that a bone conduction receiver can be provided using a plate-like piezoelectric vibrator (a piezoelectric ceramic vibrator that converts an electrical signal into an audio signal). The ear hole type bone conduction receiver is disclosed in Patent Document 1. The present invention discloses a bone conduction receiver that realizes not only bone conduction but also tympanic membrane vibration via the airway and also has the function of a conventional acoustic earphone.

図１は、耳穴式骨伝導レシーバの構造を示す図である。図１（ａ）は、背面外観（リカーカバー側から見た外観）を示す図である。図１（ｂ）は、振動伝達方向で切った断面図である。本発明では、板状の圧電振動子１０をフロントケース２０とリアカバー３０とで挟みこむ。このとき、圧電振動子１０とフロントケース２０とはその周囲をすべて密封し、それらの間に圧力部屋１５を形成する。さらに、フロントケース２０の中央部に垂直にパイプを立てて、そのパイプを介して耳穴（さらにいうと、耳穴周辺の軟骨）に振動を伝える。フロントケース２０とパイプ２５とは一体的に成型することができる。   FIG. 1 is a diagram showing a structure of an ear hole type bone conduction receiver. Fig.1 (a) is a figure which shows a back external appearance (appearance seen from the liquor cover side). FIG. 1B is a cross-sectional view taken along the vibration transmission direction. In the present invention, the plate-like piezoelectric vibrator 10 is sandwiched between the front case 20 and the rear cover 30. At this time, the surroundings of the piezoelectric vibrator 10 and the front case 20 are all sealed, and a pressure chamber 15 is formed between them. Further, a pipe is set up vertically at the center of the front case 20, and vibration is transmitted to the ear hole (more specifically, cartilage around the ear hole) through the pipe. The front case 20 and the pipe 25 can be molded integrally.

パイプ２５の先端部には、その外形の周囲にくぼみを設けて、耳穴への挿入の際に落ちにくくしてある。パイプ２５は、その中心部に小穴２６を有する。小穴２６は、内径が０．５ミリメートルから１．０ミリメートル、望ましくは０．８ミリメートルであって、長さが１０ミリメートルから１５ミリメートル程度のものである。したがって、このパイプ２５は、円筒状というよりはむしろ円柱状のものの真ん中に細い穴が開いているというイメージに近いものである。   The tip of the pipe 25 is provided with a recess around its outer shape so that it does not easily fall off when inserted into the ear hole. The pipe 25 has a small hole 26 at the center thereof. The small hole 26 has an inner diameter of 0.5 millimeters to 1.0 millimeters, preferably 0.8 millimeters, and a length of about 10 millimeters to 15 millimeters. Therefore, this pipe 25 is close to the image that a thin hole is opened in the middle of a cylindrical shape rather than a cylindrical shape.

この骨伝導レシーバを組み立てるには、まず圧電振動子に信号線を取り付けたもの（必要に応じて、背面に制振塗料を塗った面を設け、また、音調ウエイトを背面中央部に取り付けたもの）を、パイプ付きフロントケース（パイプとフロントケースとを一体的に成型したもの、以下、単にフロントケース２０という）の内側に取り付け、周囲を密封する。信号線取り出し口から信号線を取り出すことに注意しつつ、リアカバー３０を嵌める。フロントケース２０及びリアカバー３０は、ＡＢＳ樹脂などにより成型することができる。   In order to assemble this bone conduction receiver, firstly, a piezoelectric vibrator with a signal line attached (if necessary, a surface with anti-vibration paint applied on the back, and a tone weight attached to the center of the back ) Is attached to the inside of a front case with a pipe (in which the pipe and the front case are integrally molded, hereinafter simply referred to as the front case 20), and the periphery is sealed. The rear cover 30 is fitted, taking care that the signal line is taken out from the signal line outlet. The front case 20 and the rear cover 30 can be molded from ABS resin or the like.

以下、図２を参照しつつ、実施例１について説明する。圧電振動子１０は、円板状の金属板である電極板の表裏、両面にＰＺＴ（チタン酸ジルコン酸鉛重合体）の薄膜を形成せしめたものであり、圧電振動子１０に電気信号を伝える信号線１２がつながれる。ここで、電極板は、直径１８ミリメートル、厚さが２５マイクロメートルの４２Ｎを一枚用いている。ＰＺＴは、直径１５ミリメートル、厚さ５０マイクロメートルのものを合計２枚とし、電極板の両面にそれぞれ設けてある。   Hereinafter, Example 1 will be described with reference to FIG. The piezoelectric vibrator 10 is formed by forming a thin film of PZT (lead zirconate titanate polymer) on both sides of the electrode plate, which is a disk-shaped metal plate, and transmits an electric signal to the piezoelectric vibrator 10. The signal line 12 is connected. Here, as the electrode plate, one 42N having a diameter of 18 millimeters and a thickness of 25 micrometers is used. Two PZTs with a diameter of 15 millimeters and a thickness of 50 micrometers are provided in total, and are provided on both sides of the electrode plate.

圧電振動子１０を包みこむ筐体は、フロントケース２０とリアカバー３０とにより形成される。前述したようにフロントケース２０は、パイプ２５と一体的に成型される。フロントケース２０からパイプ２５を除外した部分は、皿に似た形状であり、リアカバー３０もまた、同様に皿に似た形状をしている。フロントケース２０とリアカバー３０とは、嵌め合わせることができ、それらを嵌め合わせてできた空間に圧電振動子１０が収納され、外の衝撃から保護される。   A housing enclosing the piezoelectric vibrator 10 is formed by the front case 20 and the rear cover 30. As described above, the front case 20 is molded integrally with the pipe 25. The portion excluding the pipe 25 from the front case 20 has a shape resembling a dish, and the rear cover 30 has a shape resembling a dish as well. The front case 20 and the rear cover 30 can be fitted together, and the piezoelectric vibrator 10 is housed in a space formed by fitting them, and is protected from external impacts.

本発明にあっては、圧電振動子１０は、フロントケース２０との間に密封空間である圧力部屋１５を形成する。圧電振動子１０を音響周波数の信号電圧を加えて振動させたとき、この圧力部屋には、周波数と振幅の大小に応じて圧力の変化が生ずる。その圧力は圧電振動子１０にダンパー作用と寄生振動防止用の制振作用を与えるものと考えられる。   In the present invention, the piezoelectric vibrator 10 forms a pressure chamber 15 that is a sealed space between the piezoelectric case 10 and the front case 20. When the piezoelectric vibrator 10 is vibrated by applying a signal voltage having an acoustic frequency, a pressure change occurs in the pressure chamber according to the frequency and amplitude. The pressure is considered to give the piezoelectric vibrator 10 a damper action and a damping action for preventing parasitic vibration.

圧電振動子１０は、その周辺部においてフロントケース２０に固定され、密封空間である圧力部屋１５を形成する。その固定の方法の一つとして接着がある。また、フロントケース２０とリアカバー３０とを嵌合する際に、圧着することにより密封することとする方法もある。   The piezoelectric vibrator 10 is fixed to the front case 20 at the periphery thereof, and forms a pressure chamber 15 that is a sealed space. One of the fixing methods is adhesion. Moreover, when fitting the front case 20 and the rear cover 30, there is also a method of sealing by crimping.

音調ウエイト３１は、円柱状のおもりである。ここでは直径が５ミリメートル、厚さが１．５ミリメートルの鉄の素材を用いている。この音調ウエイトの働きにより、圧電振動子１０で起こる振動は、背面ではなく、パイプ２５の向きに伝わることが担保され、周波数の低域の音質をレベルアップすることが可能となる。   The tone weight 31 is a cylindrical weight. Here, an iron material having a diameter of 5 millimeters and a thickness of 1.5 millimeters is used. Due to the function of the tone weight, it is ensured that the vibration generated in the piezoelectric vibrator 10 is transmitted to the direction of the pipe 25 instead of the back surface, and the sound quality in the low frequency range can be improved.

図２（ａ）に示すように、音調ウエイト３１を全くの中央部ではなく、若干偏心させて取り付けることも考えられる。信号線１２を取り付ける位置からみて遠い側にずらすという意義がある。また、パイプの小穴２６との位置関係からみてずらすという意義もある。   As shown in FIG. 2 (a), it is also conceivable that the tone weight 31 is attached with a slight eccentricity rather than a completely central portion. There is a significance that the signal line 12 is shifted to a side far from the position where the signal line 12 is attached. In addition, there is a significance of shifting from the position of the small hole 26 of the pipe.

図２（ａ）に示すように、実施例１にあっては、制振塗料１６を圧電振動子の背面全体に塗布し、制振塗料面を設けてある。これは、音調ウエイト３１とあいまって、制振作用をもたらすと期待できる。塗布して乾燥硬化後、硬度３０以下となるように塗布する。   As shown in FIG. 2A, in the first embodiment, the damping paint 16 is applied to the entire back surface of the piezoelectric vibrator to provide the damping paint surface. This can be expected to bring about a vibration control action together with the tone weight 31. After applying and drying and curing, it is applied to a hardness of 30 or less.

リアカバー３０とフロントケース２０との境目に信号線取り出し口が設けられる。信号線取り出し口は、信号線１２が何らかの力で引っ張られた場合であっても、信号線１２と圧電振動子１０との電気的接続が阻害されないよう必要な強度で信号線１２を把持する。   A signal line outlet is provided at the boundary between the rear cover 30 and the front case 20. Even when the signal line 12 is pulled by some force, the signal line extraction port holds the signal line 12 with a necessary strength so that the electrical connection between the signal line 12 and the piezoelectric vibrator 10 is not hindered.

本発明の耳穴式骨伝導レシーバは、気道を介して音響による鼓膜振動もできるので、健常者にも用いることができる。また、鼓膜による聴覚機能をある程度もっている聴覚障害者が用いることもできる。   Since the ear canal bone conduction receiver of the present invention can also perform acoustic eardrum vibration via the airway, it can also be used for healthy people. It can also be used by a hearing impaired person who has a certain degree of auditory function.

１０ 圧電振動子
１２ 信号線
１５ 圧力部屋
１６ 制振塗料
２０ フロントケース
２５ パイプ
２６ 小穴
３０ リヤカバー
３１ 音調ウエイト
３３ イヤフォンコード 10 Piezoelectric vibrator 12 Signal line 15 Pressure chamber 16 Damping paint 20 Front case 25 Pipe 26 Small hole 30 Rear cover 31 Tone weight 33 Earphone cord

Claims (6)

板状の圧電振動子と、
該圧電振動子に電気信号を伝える信号線と、
前記圧電振動子の振動を伝える側の筐体であり、前記圧電振動子を覆う形状をしたフロントケースと、
該フロントケースと前記圧電振動子とにより仕切られ、密閉されてなる圧力部屋と、
前記圧電振動子の振動を伝える側とは反対側の筐体であり、前記圧電振動子を覆う形状をしたリアカバーと、
前記フロントケースの中央部に設けられ、前記圧電振動子の面に対して垂直に伸び、中心部に小穴を有し、先端部の外部が耳穴挿入に適した形状を有する円筒状のパイプと、
からなり、該パイプから耳穴周辺の軟骨に骨伝導により振動を伝えるとともに、パイプ中央の小穴から気道を通じて鼓膜に空気を介した音響により振動を伝える耳穴式骨伝導レシーバ。 A plate-like piezoelectric vibrator;
A signal line for transmitting an electrical signal to the piezoelectric vibrator;
A front case for transmitting vibrations of the piezoelectric vibrator, and a front case shaped to cover the piezoelectric vibrator;
A pressure chamber partitioned and sealed by the front case and the piezoelectric vibrator;
A housing opposite to the side that transmits the vibration of the piezoelectric vibrator, and a rear cover configured to cover the piezoelectric vibrator;
A cylindrical pipe provided at the center of the front case, extending perpendicularly to the surface of the piezoelectric vibrator, having a small hole at the center, and having a shape suitable for insertion of an ear hole on the outside of the tip;
An ear hole type bone conduction receiver which transmits vibration from the pipe to the cartilage around the ear hole by bone conduction and transmits vibration from the small hole in the center of the pipe through the airway to the eardrum by sound via air. 請求項１に記載した耳穴式骨伝導レシーバであって、
前記圧電振動子の周縁部を前記フロントケース内側に当接せしめ、密封することにより前記圧力部屋を形成したことを特徴とする耳穴式骨伝導レシーバ。 The ear hole type bone conduction receiver according to claim 1,
An ear hole type bone conduction receiver, wherein the pressure chamber is formed by bringing a peripheral edge portion of the piezoelectric vibrator into contact with the inside of the front case and sealing it. 請求項１又は２のいずれか一に記載した耳穴式骨伝導レシーバであって、
前記圧電振動子のリヤカバーに近い側の中央部分に音調ウエイトを設けたことを特徴とする耳穴式骨伝導レシーバ。 The ear hole type bone conduction receiver according to any one of claims 1 and 2,
An ear hole type bone conduction receiver, wherein a tone weight is provided at a central portion of the piezoelectric vibrator close to a rear cover. 請求項１，２又は３のいずれか一に記載した耳穴式骨伝導レシーバであって、
前記圧電振動子のリヤカバーに近い側の面全体に制振塗料を塗った面を設けたことを特徴とする耳穴式骨伝導レシーバ。 The ear hole type bone conduction receiver according to any one of claims 1, 2, or 3,
An ear hole type bone conduction receiver, wherein a surface of the piezoelectric vibrator close to the rear cover is provided with a surface coated with a vibration damping paint. 請求項１，２，３又は４のいずれか一に記載した耳穴式骨伝導レシーバであって、
前記パイプの中心部に設けた小穴は、直径が０．５ミリ以上１．０ミリ以下であり、長さが１０ミリ以上１５ミリ以下であることを特徴とする耳穴式骨伝導レシーバ。 The ear hole type bone conduction receiver according to any one of claims 1, 2, 3 or 4,
An ear hole type bone conduction receiver characterized in that the small hole provided in the central portion of the pipe has a diameter of 0.5 mm to 1.0 mm and a length of 10 mm to 15 mm. 請求項１，２，３，４又は５のいずれか一に記載した耳穴式骨伝導レシーバであって、
前記圧電振動子は、電極板の表面にＰＺＴ（チタン酸ジルコン酸鉛重合体）の薄膜を形成してなるものであることを特徴とする耳穴式骨伝導レシーバ。 The ear hole type bone conduction receiver according to any one of claims 1, 2, 3, 4 or 5,
An ear hole type bone conduction receiver, wherein the piezoelectric vibrator is formed by forming a thin film of PZT (lead zirconate titanate polymer) on the surface of an electrode plate.
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