WO2009141912A1 - Earphone apparatus - Google Patents

Earphone apparatus Download PDF

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Publication number
WO2009141912A1
WO2009141912A1 PCT/JP2008/059530 JP2008059530W WO2009141912A1 WO 2009141912 A1 WO2009141912 A1 WO 2009141912A1 JP 2008059530 W JP2008059530 W JP 2008059530W WO 2009141912 A1 WO2009141912 A1 WO 2009141912A1
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Prior art keywords
piezoelectric diaphragm
piezoelectric
weight
housing
vibration
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PCT/JP2008/059530
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French (fr)
Japanese (ja)
Inventor
泰彦 野村
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日本エムエムアイテクノロジー株式会社
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Priority to PCT/JP2008/059530 priority Critical patent/WO2009141912A1/en
Priority to JP2010512894A priority patent/JPWO2009141912A1/en
Publication of WO2009141912A1 publication Critical patent/WO2009141912A1/en

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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
    • H04R17/00—Piezoelectric transducers; Electrostrictive 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
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1058—Manufacture or assembly
    • H04R1/1075—Mountings of transducers in earphones or headphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • 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
    • H04R2460/13—Hearing devices using bone conduction transducers

Definitions

  • the present invention relates to an earphone device that transmits vibration due to a piezoelectric body to a cochlear organ, for example, via an outer ear.
  • An electromagnetic speaker of this type includes a coil that generates a magnetic field, and a diaphragm on which a permanent magnet is attached.
  • the diaphragm vibrates due to the action of the magnetic field of the coil generated by the audio signal supplied from the outside, the fixed magnet and the magnetic field, and this vibration is transmitted as air vibration to the human eardrum.
  • the bone conduction type speaker vibrates the vibration unit by an audio signal supplied from the outside, and directly transmits the vibration of the vibration unit to a hard part such as a skeleton of the head.
  • the transmitted vibration is transmitted to the tympanic membrane through the skeleton.
  • Patent Documents 1 and 2 and the like There is a bone conduction type speaker having a structure in which a plate-shaped vibrating portion is supported in a cantilever manner.
  • Patent Document 1 a silicon substrate is subjected to etching processing to form a plate-like vibrating portion to be a cantilever structure, and a piezoelectric layer and a pair of conductive layers sandwiching the piezoelectric layer are formed in this vibrating portion.
  • An actuator having a stacked structure is disclosed.
  • Patent Document 2 discloses a piezoelectric speaker in which a piezoelectric vibrator supported in a cantilevered manner in a housing and an elastic body having different hardness are disposed between the piezoelectric vibrator and the housing.
  • an earphone using a bone conduction type speaker is suitable for listening to a conversation or the like, it is a fact that it is not suitable for listening to music or the like.
  • the present invention has been made in view of the above-mentioned problems, and its object is to provide an earphone device capable of generating sound of the same size as other frequency bands even in the low frequency band at audio frequencies. It is to provide.
  • the configuration of the earphone device adopted by the present invention is a piezoelectric diaphragm for converting an electric signal into mechanical vibration, a part of the piezoelectric diaphragm, a fixed end, and another part is a free end. And a sound conduit communicating with the inner space of the housing and guiding the air vibration emitted by the piezoelectric diaphragm to the outside, and provided at the free end of the piezoelectric diaphragm.
  • the piezoelectric diaphragm is formed as a plate having a rectangular flat surface, and the internal space of the housing is elongated along the longitudinal direction of the piezoelectric diaphragm.
  • the free end of the piezoelectric diaphragm is formed near a junction of the housing and the sound conduit.
  • the weight is disposed in an internal space in the vicinity of the junction of the sound conduit so as to be able to vibrate.
  • the natural frequency f of the piezoelectric diaphragm is preferably set by the following equation.
  • the impedance in the low frequency band of the piezoelectric diaphragm is artificially lowered by facilitating vibration even in the low frequency band.
  • the impedance in the low frequency band of the piezoelectric diaphragm is artificially lowered by facilitating vibration even in the low frequency band.
  • FIG. 1 It is a sectional view showing an earphone device concerning an embodiment of the present invention. It is a disassembled perspective view which shows the vibration source which concerns on the embodiment. It is an explanatory view showing operation of a piezoelectric diaphragm concerning the embodiment. It is a figure which shows the frequency characteristic of an earphone apparatus. It is a figure which shows the attachment structure of the weight with respect to the piezoelectric diaphragm by a modification.
  • FIG 1 and 2 are views showing the appearance of a canal type earphone device according to the present embodiment.
  • the earphone device 10 is detachably attached to a housing 11 formed in a hollow oval shape in cross section by a resin material (for example, a synthetic resin such as ABS, PE, PP, PVC, etc.) and the ear insertion portion 16 of the housing 11 And an ear pad 29 made of a rubber cylindrical body, and a vibration source 31 housed in the internal space 14 of the housing 11.
  • a resin material for example, a synthetic resin such as ABS, PE, PP, PVC, etc.
  • the housing 11 includes a bottom housing 12, a lid housing 13 fixed to the bottom housing 12 via a fitting mechanism (not shown), and a combination of the lid housing 13 with the bottom housing 12. And an interior space 14 defined therebetween.
  • a code cover 15 for extending the lead wire 39 to the outside is provided, and at one end of the lead wire 39, the pattern terminal 35 of the substrate 32 is connected as shown in FIG.
  • a connector (not shown) connected to an external device is connected.
  • a stepped cylindrical ear insertion portion 16 is formed to protrude.
  • An annular step portion is formed on the outer peripheral surface of the ear insertion portion 16 to prevent the ear pad 29 from coming off.
  • the inner periphery of the ear insertion portion 16 serves as a sound conduit 17 for connecting the internal space 14 to the outside, and the sound conduit 17 emits the sound emitted by the piezoelectric diaphragm to the outside.
  • the portion where the ear insertion portion 16 and the lid-side housing 13 are joined becomes a large diameter starting portion 16A, and the narrowing portion where the outside of the starting portion 16A becomes the smallest diameter in the sound conduit 17 16B, and the outside of the throttling portion 16B is a tip portion 16C that opens to the outside.
  • the sound conduit 17 has a shape whose hole diameter is different.
  • the sound conduit 17 transmits the air vibration generated in the internal space 14 by the vibration of the piezoelectric diaphragm 41 to the outside.
  • the vibration source 31 is disposed in the internal space 14 so that the weight 45 is partially contained in the sound conduit 17.
  • the tip end of the weight 45 is embedded in a space between the raised end 16A of the ear insertion portion 16, the movement distance of the weight 45 when the piezoelectric diaphragm 41 vibrates is secured.
  • ⁇ Configuration of vibration source> As shown in FIG. 2, a part of the vibration source 31 housed in the internal space 14 of the housing 11 is separated from the spacer 36 in a state of being separated substantially parallel to the rectangular substrate 32 and the substrate 32.
  • the piezoelectric diaphragm 41 supported by the substrate 32 via the interposition, and a weight 45 provided at the free end of the piezoelectric diaphragm 41.
  • an electronic element 33 constituting an amplifier circuit or the like for generating a drive signal is mounted.
  • pattern terminals 35, 35,... Drawn from the wiring pattern 34 are formed.
  • the back surface of the substrate 32 is fixed to the wall surface on the bottom side housing 12 side via the fixing portions 37, 37.
  • the piezoelectric vibration plate 41 has a laminated structure (for example, 30 mm ⁇ 5 mm ⁇ 0.4 mm) in which a rectangular piezoelectric material and a metal plate are alternately laminated.
  • the piezoelectric vibration plate 41 is alternately laminated with a plate-like piezoelectric material such as PZT (lead zirconate titanate) and a metal plate to form a nine-layer structure, and constitutes a plurality of bimorph structures.
  • a total of four substantially U-shaped electrodes 42 are provided at the left and right positions in the longitudinal direction of the piezoelectric diaphragm 41. Since these electrodes 42 are also in electrical contact with the plate-like piezoelectric members positioned between the piezoelectric diaphragms 41, by supplying drive signals to the respective electrodes 42, vibrations are applied to the respective piezoelectric members. generate.
  • FIG. 3 shows a single plate-like piezoelectric member constituting the piezoelectric vibration plate 41.
  • a strong magnetic field is applied to each electrode 42 to perform polarization processing.
  • a piezoelectric body having a piezoelectric constant d 31 in which the polarization direction and the electric field direction are aligned in the longitudinal direction of the piezoelectric body and the distortion direction is orthogonal to this is formed.
  • An audio signal supplied from the outside is transmitted to the substrate 32 through the lead wire 39, generates a drive signal amplified by the electronic device 33 mounted on the substrate 32, and is supplied to each electrode 42 of the piezoelectric diaphragm 41. Be done.
  • the piezoelectric diaphragm 41 receiving the supplied drive signal starts lateral vibration.
  • the vibration of the piezoelectric diaphragm 41 is also transmitted to the substrate 32 through the spacer 36 to vibrate the entire vibration generating source 31 and cause the housing 11 to generate mechanical vibration.
  • the vibration of the housing 11 is transmitted to the outer ear of the user, converted into an audio signal through the cochlear organ and the auditory nerve through the outer ear, and transmitted to the brain.
  • the vibration of the piezoelectric diaphragm 41 vibrates the air in the internal space 14 and reaches the tympanic membrane as an air conduction sound through the sound conduit 17 and is transmitted to the brain through the cochlear organ and the auditory nerve.
  • the above is the basic operation of the earphone device.
  • a characteristic line A indicated by a solid line indicates frequency characteristics of the piezoelectric body (size: 30 mm ⁇ 5 mm ⁇ 0.4 mm, Young's modulus: 6.67 ⁇ 10 10 , as indicated by the characteristic line A, piezoelectric
  • a weight 45 ( ⁇ 5 ⁇ 5 mm: 0.8 g) is provided at the free end of the piezoelectric diaphragm 41 (a position at a distance of 27 mm from the spacer 36).
  • a mechanical resonance point occurs in the vicinity of 100 Hz in the piezoelectric diaphragm 41 by the weight 45. That is, the weight 45 makes the piezoelectric vibrating plate 41 easily vibrated in the low frequency range (around 100 Hz).
  • the piezoelectric diaphragm 4 can be vibrated to a large extent, and the generated sound can be increased.
  • ⁇ Effect of earphone device> In the earphone device 10 according to the present embodiment, by providing the weight 45 at the free end of the piezoelectric diaphragm 41, the resonance point of the piezoelectric diaphragm 41 is made to be in the low frequency band. Thus, the piezoelectric diaphragm 41 can generate vibration even in a low frequency band, and can generate a large amount of low frequency sound as compared with the piezoelectric diaphragm without the weight 45. Become.
  • the earphone device 10 further includes an ear insertion portion 16 having a sound conduit 17.
  • the sound in the audible frequency band vibrates the air in the internal space 14 by the vibration of the piezoelectric diaphragm 41, and the air vibration is transmitted to the ear canal of the user through the sound conduit 17.
  • the vibration of the piezoelectric vibrator 41 is transmitted to the housing 11, and this mechanical vibration is transmitted through the outer ear via the ear insertion portion 16 and the ear pad 29.
  • the earphone device 10 can secure a wide range of the generated frequency, and the clarity of the sound is significantly improved.
  • the vibration can be increased in the low frequency band and the sound in the low frequency band can be generated more than in the piezoelectric vibration plate without the weight.
  • the vibration generating source 31 is disposed so as to overlap the piezoelectric vibrating plate 41 on the substrate 32 in a separated state, the area occupied by the substrate and the piezoelectric vibrating plate is larger than that of Patent Document 1 in which Can be narrowed, and the earphone device 10 can be miniaturized.
  • the vibration generating source 31 has a structure in which the piezoelectric vibration plate 41 is supported in a cantilever manner with respect to the substrate 32, the vibration of the piezoelectric vibration plate 41 receiving the supply of the drive signal can be efficiently generated. it can.
  • the weight m of the weight is about 0.05 to about the size of the piezoelectric vibration plate 41 when the Young's modulus is 6.67 ⁇ 10 10 N / m 2. It has been verified that the natural frequency f can be set to 80 to 400 Hz by setting it to 1.00 g, and a remarkable effect can be obtained.
  • the natural frequency f of the piezoelectric diaphragm 41 can be obtained by varying the mass m of the weight based on Equation 3.
  • FIG. 5 shows an example of the attachment structure of the weight to the piezoelectric diaphragm.
  • FIG. 5A shows a state in which a cylindrical weight 45 is attached to the back surface of the piezoelectric diaphragm 41 (the opposite side as viewed from the sound conduit 17).
  • FIG. 5B shows a state in which cylindrical weights 45 a and 45 b are attached to the front and back surfaces of the piezoelectric diaphragm 41.
  • FIG. 5C shows a state in which small-diameter cylindrical weights 45 c and 45 d are attached to the surface of the piezoelectric diaphragm 41.
  • FIG. 5D shows a state in which a plate-like weight 45 e is attached to the surface of the piezoelectric vibration plate 41.
  • FIG. 5E shows a state in which plate-like weights 45f and 45g are attached to the front and back surfaces of the piezoelectric diaphragm 41.
  • the structure is not limited to the above mounting structure, and any structure may be used as long as a weight is provided on the free end side of the piezoelectric diaphragm 41.
  • the vibration state of the air generated in the internal space 14 differs depending on the shape of the weight provided at the free end of the piezoelectric diaphragm 41, so the sound emitted from the sound conduit 17 changes. Therefore, by appropriately selecting the shape and the mounting position of the weight, the earphone device 10 can be provided according to the needs of the user.
  • the piezoelectric diaphragm 41 is supported in a cantilever manner by the spacer 36.
  • the present invention is not limited thereto. Both ends of the piezoelectric diaphragm 41 are supported by the spacer and the intermediate portion is used as a free end. It may be a structure to vibrate. At this time, a weight may be attached to the middle portion.
  • the piezoelectric diaphragm 41 is formed by laminating the piezoelectric body in nine layers, and four substantially U-shaped electrodes 42 are provided at the left and right positions of the long side.
  • the number of laminated piezoelectric vibrators 41 and the material thereof are not limited to this, and may be piezoelectric bodies having other piezoelectric constants as long as the piezoelectric vibrator 41 vibrates in the thickness direction by the supplied drive signal. It is also good.
  • the ear insertion portion 16 of the earphone device 10 is inserted at the position of the boundary between the pinna of the user and the ear canal, but the tip end side of the ear insertion portion 16 is tapered. It may be configured to be positively inserted into the ear canal of the user.
  • the housing 11 from 2 members of the bottom side housing 12 and the lid side housing 13 with the resin material was mentioned as the example, what was integrally formed may be used.
  • the vibration source of the earphone device 10 according to the above embodiment does not have an electromagnetic generation source that generates sound by a magnetic field, so that it can be used at a place where a strong magnetic field such as MRI is generated.

Abstract

An earphone apparatus (10) has a weight (45) at the free end of a piezoelectric diaphragm (41) to make the resonance point of the piezoelectric diaphragm (41) in a low-frequency band. This enables the piezoelectric diaphragm (41) to generate vibration even in the low-frequency band. Thus, the piezoelectric diaphragm (41) can generate a larger sound in the low-frequency band than that generated by a piezoelectric diaphragm having no weight (45).

Description

イヤホン装置Earphone device
　本発明は、圧電体による振動を、例えば外耳を介して蝸牛器官に伝達するイヤホン装置に関する。 The present invention relates to an earphone device that transmits vibration due to a piezoelectric body to a cochlear organ, for example, via an outer ear.
　一般、イヤホン装置には、電磁型のスピーカが多く用いられている。この種の電磁型のスピーカは、磁界を発生するコイルと、永久磁石が貼着された振動板と、を具備する。この電磁型のスピーカは、外部から供給される音声信号によって発生するコイルの磁界と、固定磁石と磁界との作用によって振動板が振動し、この振動が空気振動となって人間の鼓膜へ伝わる。 In general, electromagnetic speakers are often used in earphone devices. An electromagnetic speaker of this type includes a coil that generates a magnetic field, and a diaphragm on which a permanent magnet is attached. In this electromagnetic speaker, the diaphragm vibrates due to the action of the magnetic field of the coil generated by the audio signal supplied from the outside, the fixed magnet and the magnetic field, and this vibration is transmitted as air vibration to the human eardrum.
　一方、この電磁型のスピーカにあっては、発生する磁界の人体への影響が昨今懸念されるようになってきており、磁界を発生させることなく音を伝えることのできる骨伝導型のスピーカを備えたイヤホン装置が注目されてきている。 On the other hand, in the case of this electromagnetic speaker, the influence of the generated magnetic field on the human body has become a concern in recent years, and a bone conduction speaker capable of transmitting sound without generating a magnetic field is now considered. Attention has been focused on the provided earphone device.
　この骨伝導型のスピーカは、外部から供給される音声信号により振動部を振動させ、頭部の骨格等の硬い部分に、この振動部の振動を直接伝達させるものである。伝達された振動は、骨格を通して鼓膜に伝えられる。 The bone conduction type speaker vibrates the vibration unit by an audio signal supplied from the outside, and directly transmits the vibration of the vibration unit to a hard part such as a skeleton of the head. The transmitted vibration is transmitted to the tympanic membrane through the skeleton.
　この骨伝導型のスピーカは、板状に形成した振動部を片持ち支持する構造のものがある（特許文献１および２等）。 There is a bone conduction type speaker having a structure in which a plate-shaped vibrating portion is supported in a cantilever manner (Patent Documents 1 and 2 and the like).
　特許文献１には、シリコン基板にエッチング処理を施して、片持梁構造となる板状の振動部を形成し、この振動部に圧電体層と、この圧電体層を挟み込む一対の導電層を積層する構造のアクチュエータが開示されている。 In Patent Document 1, a silicon substrate is subjected to etching processing to form a plate-like vibrating portion to be a cantilever structure, and a piezoelectric layer and a pair of conductive layers sandwiching the piezoelectric layer are formed in this vibrating portion. An actuator having a stacked structure is disclosed.
　また、特許文献２には、筐体内に片持ち支持された圧電振動子と、この圧電振動子と筐体との間に異なる硬さを有する弾性体を配置した圧電式スピーカが開示されている。
特開２００６－１００９５４号公報 特開２００７－２７５８１９号公報 Further, Patent Document 2 discloses a piezoelectric speaker in which a piezoelectric vibrator supported in a cantilevered manner in a housing and an elastic body having different hardness are disposed between the piezoelectric vibrator and the housing. .
Japanese Patent Application Publication No. 2006-100954 JP 2007-275819 A
　しかしながら、骨伝導型のスピーカにおいては、圧電素子（セラミック）の特性上、周波数が低くなるほどインピーダンスが高くなってしまい、電流が流れにくくなる。つまり、周波数が低くなるに伴って、圧電振動子の振動が小さくなり、音が小さくなる。 However, in the bone conduction type speaker, the lower the frequency is, the higher the impedance is, and the current hardly flows due to the characteristics of the piezoelectric element (ceramic). That is, as the frequency decreases, the vibration of the piezoelectric vibrator decreases and the sound decreases.
　このため、骨伝導型のスピーカを用いたイヤホンは、会話等を聴く場合においては適しているものの、音楽等を聴く場合においては適しているものとはいえないのが実情である。 For this reason, although an earphone using a bone conduction type speaker is suitable for listening to a conversation or the like, it is a fact that it is not suitable for listening to music or the like.
　本発明は、上述した課題に鑑なみてなされたもので、その目的は、可聴周波数における低周波数帯域においても、他の周波数帯域と同様の大きさの音を発生することが可能なイヤホン装置を提供することにある。 The present invention has been made in view of the above-mentioned problems, and its object is to provide an earphone device capable of generating sound of the same size as other frequency bands even in the low frequency band at audio frequencies. It is to provide.
　上記課題を解決するため、本発明が採用するイヤホン装置の構成は、電気信号を機械振動に変換する圧電振動板と、前記圧電振動板を、その一部が固定端、他の部分が自由端となるように支持して内部空間内に収納するハウジングと、前記ハウジングの内部空間に連通し、前記圧電振動板が発する空気振動を外部に導く音導管と、前記圧電振動板の自由端に設けられる錘と、を具備したことを特徴とする
　上記イヤホン装置において、前記圧電振動板は平面が長方形状の板体として形成され、前記ハウジングの内部空間は前記圧電振動板の長手方向に沿って細長く形成され、前記圧電振動板の自由端は前記ハウジングと前記音導管の接合部付近に位置するように形成されていることが好ましい。 In order to solve the above problems, the configuration of the earphone device adopted by the present invention is a piezoelectric diaphragm for converting an electric signal into mechanical vibration, a part of the piezoelectric diaphragm, a fixed end, and another part is a free end. And a sound conduit communicating with the inner space of the housing and guiding the air vibration emitted by the piezoelectric diaphragm to the outside, and provided at the free end of the piezoelectric diaphragm. In the above-mentioned earphone device, the piezoelectric diaphragm is formed as a plate having a rectangular flat surface, and the internal space of the housing is elongated along the longitudinal direction of the piezoelectric diaphragm. Preferably, the free end of the piezoelectric diaphragm is formed near a junction of the housing and the sound conduit.
　上記イヤホン装置において、前記音導管の前記接合部付近の内部空間に、前記錘が振動可能な状態で配置されることが好ましい。 In the above-mentioned earphone device, it is preferable that the weight is disposed in an internal space in the vicinity of the junction of the sound conduit so as to be able to vibrate.
　上記イヤホン装置において、前記圧電振動板の固有周波数ｆは、以下の数式によって設定されることが好ましい。 In the earphone device, the natural frequency f of the piezoelectric diaphragm is preferably set by the following equation.
Figure JPOXMLDOC01-appb-M000002
Figure JPOXMLDOC01-appb-M000002
　但し、
　ｅ：ヤング率 (Ｎ／ｍ２)
　ｂ：幅（ｍ）
　ｌ：長さ（ｍ）
　ｄ：厚さ（ｍ）
　ｍ：錘の質量（ｋｇ） However,
e: Young's modulus (N / m 2 )
b: Width (m)
l: Length (m)
d: Thickness (m)
m: Weight of weight (kg)
　本発明によれば、圧電振動板の自由端に錘を設けることにより、低周波数帯域においても振動し易くすることで、圧電振動板の低周波数帯域におけるインピーダンスを擬似的に低くする。これにより、可聴周波数の低周波数帯域においても、他の周波数帯域と同様の大きさの音を発生することが可能となり、音楽等を聴くのに適したスピーカ装置を実現する。 According to the present invention, by providing a weight at the free end of the piezoelectric diaphragm, the impedance in the low frequency band of the piezoelectric diaphragm is artificially lowered by facilitating vibration even in the low frequency band. As a result, even in the low frequency band of the audio frequency, it is possible to generate a sound having the same magnitude as that of the other frequency bands, and a speaker device suitable for listening to music or the like is realized.
本発明の実施形態に係るイヤホン装置を示す断面図である。It is a sectional view showing an earphone device concerning an embodiment of the present invention. 同実施形態に係る振動発生源を示す分解斜視図である。It is a disassembled perspective view which shows the vibration source which concerns on the embodiment. 同実施形態に係る圧電振動板の動作を示す説明図である。It is an explanatory view showing operation of a piezoelectric diaphragm concerning the embodiment. イヤホン装置の周波数特性を示す図である。It is a figure which shows the frequency characteristic of an earphone apparatus. 変形例による圧電振動板に対する錘の取付構造を示す図である。It is a figure which shows the attachment structure of the weight with respect to the piezoelectric diaphragm by a modification.
符号の説明Explanation of sign
１０…イヤホン装置、１１…ハウジング、１４…内部空間、１６…イヤー挿入部、１７…音導管、２９…イヤーパット、３１…振動発生源、３２…基板、３３…電子素子、４１…圧電振動板、４２…電極、４５…錘。 DESCRIPTION OF SYMBOLS 10 ... Earphone apparatus, 11 ... Housing, 14 ... Internal space, 16 ... Ear insertion part, 17 ... Sound conduit, 29 ... Ear pad, 31 ... Vibration source, 32 ... Board | substrate, 33 ... Electronic element, 41 ... Piezoelectric diaphragm , 42 ... electrode, 45 ... weight.
＜イヤホン装置の構成＞
　本発明の好適な実施の形態について図面を参照して説明する。 <Configuration of Earphone Device>
A preferred embodiment of the present invention will be described with reference to the drawings.
　図１及び図２は、本実施形態によるカナル型のイヤホン装置の外観を示す図である。 1 and 2 are views showing the appearance of a canal type earphone device according to the present embodiment.
　イヤホン装置１０は、樹脂材料（例えば、ＡＢＳ,ＰＥ,ＰＰ,ＰＶＣなどの合成樹脂）により中空の断面長円状に形成されたハウジング１１と、このハウジング１１のイヤー挿入部１６に着脱可能に取り付けられ、ゴム製の筒状体からなるイヤーパッド２９と、ハウジング１１の内部空間１４内に収容される振動発生源３１と、を具備する。
＜ハウジングの構成＞
　ハウジング１１は、底側ハウジング１２と、この底側ハウジング１２に嵌合機構（図示せず）を介して固着される蓋側ハウジング１３と、底側ハウジング１２に蓋側ハウジング１３を合わせることにより両者間に画成される内部空間１４と、を具備する。 The earphone device 10 is detachably attached to a housing 11 formed in a hollow oval shape in cross section by a resin material (for example, a synthetic resin such as ABS, PE, PP, PVC, etc.) and the ear insertion portion 16 of the housing 11 And an ear pad 29 made of a rubber cylindrical body, and a vibration source 31 housed in the internal space 14 of the housing 11.
<Configuration of housing>
The housing 11 includes a bottom housing 12, a lid housing 13 fixed to the bottom housing 12 via a fitting mechanism (not shown), and a combination of the lid housing 13 with the bottom housing 12. And an interior space 14 defined therebetween.
　また、ハウジング１１の一端には、リード線３９を外部に延在させるコードカバー１５が設けられ、このリード線３９の一端には、図２に示すように、基板３２のパターン端子３５が接続され、他端には外部機器に連結されるコネクタ（図示せず）が接続される。 Further, at one end of the housing 11, a code cover 15 for extending the lead wire 39 to the outside is provided, and at one end of the lead wire 39, the pattern terminal 35 of the substrate 32 is connected as shown in FIG. At the other end, a connector (not shown) connected to an external device is connected.
　一方、蓋側ハウジング１３の他端側には、段付筒状のイヤー挿入部１６が突出形成される。このイヤー挿入部１６の外周面には環状の段部が形成され、イヤーパッド２９の抜け止めを図る。 On the other hand, on the other end side of the lid side housing 13, a stepped cylindrical ear insertion portion 16 is formed to protrude. An annular step portion is formed on the outer peripheral surface of the ear insertion portion 16 to prevent the ear pad 29 from coming off.
　また、イヤー挿入部１６の内周が、前記内部空間１４を外部に連通させる音導管１７となり、この音導管１７は、前記圧電振動板が発する音を外部に放音する。 Further, the inner periphery of the ear insertion portion 16 serves as a sound conduit 17 for connecting the internal space 14 to the outside, and the sound conduit 17 emits the sound emitted by the piezoelectric diaphragm to the outside.
　イヤー挿入部１６は、このイヤー挿入部１６と蓋側ハウジング１３とが接合する部分が大径な起端部１６Ａとなり、この起端部１６Ａの外側が当該音導管１７において最も小径となる絞り部１６Ｂとなり、この絞り部１６Ｂの外側が外部に開口する先端部１６Ｃとなる。これにより、音導管１７は、その穴径が異なる形状となる。この音導管１７は、圧電振動板４１の振動によって内部空間１４内に発生する空気振動を外部に伝える。 The portion where the ear insertion portion 16 and the lid-side housing 13 are joined becomes a large diameter starting portion 16A, and the narrowing portion where the outside of the starting portion 16A becomes the smallest diameter in the sound conduit 17 16B, and the outside of the throttling portion 16B is a tip portion 16C that opens to the outside. As a result, the sound conduit 17 has a shape whose hole diameter is different. The sound conduit 17 transmits the air vibration generated in the internal space 14 by the vibration of the piezoelectric diaphragm 41 to the outside.
　錘４５は、音導管１７内にその一部が内在するように、当該振動発生源３１が内部空間１４内に配置される。特に、錘４５の先端部がイヤー挿入部１６の起端部１６Ａ内に空間を介在させた状態で内在されるため、圧電振動板４１が振動した際の錘４５の移動距離が確保される。
＜振動発生源の構成＞
　ハウジング１１の内部空間１４内に収容される振動発生源３１は、図２に示すように、矩形状の基板３２と、前記基板３２と略平行に離間した状態で、その一部がスペーサ３６を介して基板３２に支持される圧電振動板４１と、圧電振動板４１の自由端に設けられる錘４５と、を有する。 The vibration source 31 is disposed in the internal space 14 so that the weight 45 is partially contained in the sound conduit 17. In particular, since the tip end of the weight 45 is embedded in a space between the raised end 16A of the ear insertion portion 16, the movement distance of the weight 45 when the piezoelectric diaphragm 41 vibrates is secured.
<Configuration of vibration source>
As shown in FIG. 2, a part of the vibration source 31 housed in the internal space 14 of the housing 11 is separated from the spacer 36 in a state of being separated substantially parallel to the rectangular substrate 32 and the substrate 32. The piezoelectric diaphragm 41 supported by the substrate 32 via the interposition, and a weight 45 provided at the free end of the piezoelectric diaphragm 41.
　基板３２の表面には、駆動信号を生成するための増幅回路等を構成する電子素子３３が実装される。また、基板３２の一側には、配線パターン３４から引き出されたパターン端子３５，３５…が形成される。一方、基板３２の裏面は、固定部位３７，３７を介して底側ハウジング１２側の壁面に固定される。 On the surface of the substrate 32, an electronic element 33 constituting an amplifier circuit or the like for generating a drive signal is mounted. At one side of the substrate 32, pattern terminals 35, 35,... Drawn from the wiring pattern 34 are formed. On the other hand, the back surface of the substrate 32 is fixed to the wall surface on the bottom side housing 12 side via the fixing portions 37, 37.
　圧電振動板４１は、長方形状をなす圧電体と金属板とを交互に積層した積層構造（例えば、３０ｍｍ×５ｍｍ×０．４ｍｍ）となる。例えば、圧電振動板４１は、ＰＺＴ（チタン酸ジルコン酸鉛）等の板状圧電体と金属板と交互に積層して９層構造をなし、複数のバイモルフ構造を構成する。さらに、圧電振動板４１には、その長手方向の左右位置に、略「コ」字状の電極４２，４２…が合計４個設けられる。これらの電極４２は、圧電振動板４１の間に位置した板状圧電体に対しても電気的に接触しているため、各電極４２に駆動信号を供給することにより、各圧電体に振動を発生させる。 The piezoelectric vibration plate 41 has a laminated structure (for example, 30 mm × 5 mm × 0.4 mm) in which a rectangular piezoelectric material and a metal plate are alternately laminated. For example, the piezoelectric vibration plate 41 is alternately laminated with a plate-like piezoelectric material such as PZT (lead zirconate titanate) and a metal plate to form a nine-layer structure, and constitutes a plurality of bimorph structures. Furthermore, a total of four substantially U-shaped electrodes 42 are provided at the left and right positions in the longitudinal direction of the piezoelectric diaphragm 41. Since these electrodes 42 are also in electrical contact with the plate-like piezoelectric members positioned between the piezoelectric diaphragms 41, by supplying drive signals to the respective electrodes 42, vibrations are applied to the respective piezoelectric members. generate.
　ここで、圧電振動板４１における振動の発生原理について、図３に基づいて説明する。 Here, the generation principle of the vibration in the piezoelectric diaphragm 41 will be described based on FIG.
　図３は、圧電振動板４１を構成する１枚の板状圧電体を示している。この圧電体では、上段の右側に示すように、各電極４２に強磁界を与えて分極処理を施す。これにより、圧電体の長手方向に分極方向と電界方向が揃い、歪み方向がこれに直交する圧電定数ｄ３１の圧電体が形成される。 FIG. 3 shows a single plate-like piezoelectric member constituting the piezoelectric vibration plate 41. In this piezoelectric body, as shown on the right side of the upper row, a strong magnetic field is applied to each electrode 42 to perform polarization processing. As a result, a piezoelectric body having a piezoelectric constant d 31 in which the polarization direction and the electric field direction are aligned in the longitudinal direction of the piezoelectric body and the distortion direction is orthogonal to this is formed.
　このため、中段のように、駆動信号のうち正の部分を印加した場合には、例えば圧電体の中心が上側に撓み、下段のように、負の部分を印加した場合には、圧電体の中心が下側に撓み、交互に繰り返すことにより圧電振動板４１に横振動を発生させる。
＜イヤホン装置の動作＞
　次に、イヤホン装置１０の動作について説明する。 Therefore, as in the middle stage, when the positive part of the drive signal is applied, for example, the center of the piezoelectric body is bent upward, and when the negative part is applied as in the lower stage, the piezoelectric body is The center bends downward, and alternately repeating this causes the piezoelectric vibration plate 41 to generate lateral vibration.
<Operation of the earphone device>
Next, the operation of the earphone device 10 will be described.
　外部から供給される音声信号は、リード線３９を介して基板３２に送信され、基板３２に実装された電子素子３３によって増幅された駆動信号を生成し、圧電振動板４１の各電極４２に供給される。供給された駆動信号を受けた圧電振動板４１は横振動を開始する。圧電振動板４１の振動は、スペーサ３６を介して基板３２にも伝達され、当該振動発生源３１全体を振動させ、ハウジング１１に機械振動を生じさせる。 An audio signal supplied from the outside is transmitted to the substrate 32 through the lead wire 39, generates a drive signal amplified by the electronic device 33 mounted on the substrate 32, and is supplied to each electrode 42 of the piezoelectric diaphragm 41. Be done. The piezoelectric diaphragm 41 receiving the supplied drive signal starts lateral vibration. The vibration of the piezoelectric diaphragm 41 is also transmitted to the substrate 32 through the spacer 36 to vibrate the entire vibration generating source 31 and cause the housing 11 to generate mechanical vibration.
　このハウジング１１の振動は、使用者の外耳に伝達され、外耳を介して蝸牛器官・聴神経を介して音声信号に変換されて脳に伝達される。 The vibration of the housing 11 is transmitted to the outer ear of the user, converted into an audio signal through the cochlear organ and the auditory nerve through the outer ear, and transmitted to the brain.
　一方、圧電振動板４１の振動は、内部空間１４内の空気を振動させ、気導音として音導管１７を介して鼓膜に達し、蝸牛器官・聴覚神経を経由して脳に伝達される。 On the other hand, the vibration of the piezoelectric diaphragm 41 vibrates the air in the internal space 14 and reaches the tympanic membrane as an air conduction sound through the sound conduit 17 and is transmitted to the brain through the cochlear organ and the auditory nerve.
　以上が基本的なイヤホン装置の動作である。 The above is the basic operation of the earphone device.
　ここで、図４の周波数特性に基づいて説明する。この図４に示す特性線図では、横軸が周波数、縦軸がインピーダンスとなり、両軸を対数表示したものです。 Here, it demonstrates based on the frequency characteristic of FIG. In the characteristic diagram shown in Fig. 4, the horizontal axis is frequency, the vertical axis is impedance, and both axes are displayed logarithmically.
　実線で示す特性線Ａは、圧電体（大きさ：３０ｍｍ×５ｍｍ×０．４ｍｍ、ヤング率：６．６７×１０１０についての周波数特性を示している。この特性線Ａに示すように、圧電体は、その特性から低周波数になるほどインピーダンスが高くなる。このため、圧電体は、低周波数帯域において電流を流れにくくし、駆動信号の振幅が同じであっても、振動が小さくなって音が小さくなる。 A characteristic line A indicated by a solid line indicates frequency characteristics of the piezoelectric body (size: 30 mm × 5 mm × 0.4 mm, Young's modulus: 6.67 × 10 10 , as indicated by the characteristic line A, piezoelectric The lower the frequency, the higher the impedance of the body, which makes it difficult for the piezoelectric body to flow current in the low frequency band, and even if the amplitude of the drive signal is the same, the vibration becomes smaller and the sound becomes smaller. It becomes smaller.
　そこで、本実施形態によるイヤホン装置１０では、圧電振動板４１の自由端（スペーサ３６からの距離が２７ｍｍの位置）に錘４５（φ５×５ｍｍ：０．８ｇ）を設ける。これにより、圧電振動板４１には、錘４５によって機械的な共振点が１００Ｈｚ近辺に発生する。つまり、錘４５が圧電振動板４１に対して、低周波数域（１００Ｈｚ近辺）で振動し易い状態を作ることになる。 Therefore, in the earphone device 10 according to the present embodiment, a weight 45 (φ5 × 5 mm: 0.8 g) is provided at the free end of the piezoelectric diaphragm 41 (a position at a distance of 27 mm from the spacer 36). As a result, a mechanical resonance point occurs in the vicinity of 100 Hz in the piezoelectric diaphragm 41 by the weight 45. That is, the weight 45 makes the piezoelectric vibrating plate 41 easily vibrated in the low frequency range (around 100 Hz).
　これにより、図４中の点線で示す特性線Ａ´のように、１００Ｈｚ近辺でインピーダンスが擬似的に下がることになる。この結果、駆動信号が低周波数域であっても、圧電振動板４を大きく振動させることができ、発生する音を大きくすることが可能となる。
＜イヤホン装置の効果＞
　本実施形態によるイヤホン装置１０では、圧電振動板４１の自由端に錘４５を設けることによって、圧電振動板４１の共振点を低周波数帯域に作られるようにした。これにより、圧電振動板４１は、低周波数帯域であっても振動を発生されることができ、錘４５を設けていない圧電振動板に比べて、低周波数の音を大きく発生させることが可能となる。 As a result, as shown by a characteristic line A ′ indicated by a dotted line in FIG. 4, the impedance virtually drops around 100 Hz. As a result, even if the drive signal is in a low frequency range, the piezoelectric diaphragm 4 can be vibrated to a large extent, and the generated sound can be increased.
<Effect of earphone device>
In the earphone device 10 according to the present embodiment, by providing the weight 45 at the free end of the piezoelectric diaphragm 41, the resonance point of the piezoelectric diaphragm 41 is made to be in the low frequency band. Thus, the piezoelectric diaphragm 41 can generate vibration even in a low frequency band, and can generate a large amount of low frequency sound as compared with the piezoelectric diaphragm without the weight 45. Become.
　また、イヤホン装置１０では、音導管１７を有するイヤー挿入部１６を備えている。これにより、可聴周波数帯域の音は、圧電振動板４１の振動が内部空間１４内の空気を振動させ、この空気振動が音導管１７を介して使用者の外耳道に伝達する。一方、比較的低い周波帯域の音については、圧電振動体４１の振動がハウジング１１に伝達され、イヤー挿入部１６およびイヤーパッド２９を介して、この機械振動が外耳を介して伝達される。 The earphone device 10 further includes an ear insertion portion 16 having a sound conduit 17. Thereby, the sound in the audible frequency band vibrates the air in the internal space 14 by the vibration of the piezoelectric diaphragm 41, and the air vibration is transmitted to the ear canal of the user through the sound conduit 17. On the other hand, for sounds in a relatively low frequency band, the vibration of the piezoelectric vibrator 41 is transmitted to the housing 11, and this mechanical vibration is transmitted through the outer ear via the ear insertion portion 16 and the ear pad 29.
　これにより、イヤホン装置１０は、発生周波数の領域を広く確保することが可能となり、音の明瞭度が著しく向上することになる。 As a result, the earphone device 10 can secure a wide range of the generated frequency, and the clarity of the sound is significantly improved.
　しかも、前述した如く、圧電振動板４１に錘４５を設けているから、錘のない圧電振動板に比べ、低周波数帯域において振動を大きくでき、低周波数帯域の音も大きく発生させることができる。 Moreover, as described above, since the weight 45 is provided on the piezoelectric vibration plate 41, the vibration can be increased in the low frequency band and the sound in the low frequency band can be generated more than in the piezoelectric vibration plate without the weight.
　さらに、振動発生源３１は、基板３２に圧電振動板４１を離間した状態で重ねるように配置しているため、基板と圧電振動板とを一平面上に配置する特許文献１に比べ、占有面積を狭くすることが可能となり、イヤホン装置１０の小型化が可能となる。 Furthermore, since the vibration generating source 31 is disposed so as to overlap the piezoelectric vibrating plate 41 on the substrate 32 in a separated state, the area occupied by the substrate and the piezoelectric vibrating plate is larger than that of Patent Document 1 in which Can be narrowed, and the earphone device 10 can be miniaturized.
　しかも、振動発生源３１では、基板３２に対して圧電振動板４１を片持ちで支持する構造となっているため、駆動信号の供給を受けた圧電振動板４１の振動を効率良く発生させることができる。
＜変形例＞
（１）
　本発明においては、発明者は、鋭利実験した結果、圧電振動板４１の大きさにおいて、ヤング率が６．６７×１０１０Ｎ／ｍ２の場合、錘の重さｍを約０．０５～１．００ｇに設定することで、固有周波数ｆを８０～４００Ｈｚに設定でき、顕著な効果が得られることが検証されている。 Moreover, since the vibration generating source 31 has a structure in which the piezoelectric vibration plate 41 is supported in a cantilever manner with respect to the substrate 32, the vibration of the piezoelectric vibration plate 41 receiving the supply of the drive signal can be efficiently generated. it can.
<Modification>
(1)
In the present invention, as a result of a sharp experiment, the inventor found that the weight m of the weight is about 0.05 to about the size of the piezoelectric vibration plate 41 when the Young's modulus is 6.67 × 10 10 N / m 2. It has been verified that the natural frequency f can be set to 80 to 400 Hz by setting it to 1.00 g, and a remarkable effect can be obtained.
　具体的には、数３に基づいて、錘の質量ｍを可変することで圧電振動板４１の固有周波数ｆが得られる。 Specifically, the natural frequency f of the piezoelectric diaphragm 41 can be obtained by varying the mass m of the weight based on Equation 3.
Figure JPOXMLDOC01-appb-M000003
Figure JPOXMLDOC01-appb-M000003
　但し、
　ｅ：ヤング率 (Ｎ／ｍ２)
　ｂ：幅（ｍ）
　ｌ：長さ（ｍ）
　ｄ：厚さ（ｍ）
　ｍ：錘の質量（ｋｇ）
　上記数３に基づいて、錘の重さｍを決めることで、所望の固有周波数ｆを圧電振動板４１に発生させることが可能となる。
（２）
　前記実施形態では、圧電振動板４１の自由端に円柱状の錘４５を設ける構成としたが、圧電振動板に対する錘の取付構造はこれに限るものではなく、種々の対応が可能である。 However,
e: Young's modulus (N / m 2 )
b: Width (m)
l: Length (m)
d: Thickness (m)
m: Weight of weight (kg)
By determining the weight m of the weight based on Equation 3, it is possible to generate the desired natural frequency f in the piezoelectric diaphragm 41.
(2)
In the embodiment, the cylindrical weight 45 is provided at the free end of the piezoelectric diaphragm 41. However, the mounting structure of the weight to the piezoelectric diaphragm is not limited to this, and various correspondences can be made.
　図５は、圧電振動板に対する錘の取付構造の一例を示している。 FIG. 5 shows an example of the attachment structure of the weight to the piezoelectric diaphragm.
　図５（ａ）は、圧電振動板４１の裏面（音導管１７から見て反対側）に円柱状の錘４５を取り付けた状態を示している。図５（ｂ）は、圧電振動板４１の表裏面に円柱状の錘４５ａ、４５ｂを取り付けた状態を示している。図５（ｃ）は、圧電振動板４１の表面に小径の円柱状の錘４５ｃ、４５ｄを取り付けた状態を示している。図５（ｄ）は、圧電振動板４１の表面に板状の錘４５ｅを取り付けた状態を示している。図５（ｅ）は、圧電振動板４１の表裏面に板状の錘４５ｆ，４５ｇを取り付けた状態を示している。 FIG. 5A shows a state in which a cylindrical weight 45 is attached to the back surface of the piezoelectric diaphragm 41 (the opposite side as viewed from the sound conduit 17). FIG. 5B shows a state in which cylindrical weights 45 a and 45 b are attached to the front and back surfaces of the piezoelectric diaphragm 41. FIG. 5C shows a state in which small-diameter cylindrical weights 45 c and 45 d are attached to the surface of the piezoelectric diaphragm 41. FIG. 5D shows a state in which a plate-like weight 45 e is attached to the surface of the piezoelectric vibration plate 41. FIG. 5E shows a state in which plate- like weights 45f and 45g are attached to the front and back surfaces of the piezoelectric diaphragm 41.
　上記取付構造に限らず、圧電振動板４１の自由端側に錘を設ける構造であればよい。 The structure is not limited to the above mounting structure, and any structure may be used as long as a weight is provided on the free end side of the piezoelectric diaphragm 41.
　また、圧電振動板４１の自由端に設ける錘の形状によって、内部空間１４に発生する空気の振動状態が異なるため、音導管１７から放音される音が変化することになる。そこで、錘は、その形状および取付位置を適宜選択することで、ユーザのニーズに応じてイヤホン装置１０を提供することが可能となる。
（３）
　前記実施形態では、圧電振動板４１をスペーサ３６で片持ち支持する構造としたが、本発明はこれに限らず、圧電振動板４１の両端をスペーサで両持ち支持して中間部分を自由端として振動させる構造であってもよい。この際、中間部分に錘を取り付けるようにすればよい。
（４）
　本発明は、前記実施形態では、カナル型のイヤホン装置１０について説明したが、これに限らず、ハウジング１１の一端に耳の後ろに回る略「Ｃ」字状のクリップを設けるようにしてもよい。
（５）
　前記実施形態の圧電振動板４１は、圧電体を９層に積層して形成し、長辺の左右位置には４個の略「コ」字状の電極４２，４２…を設ける構成としたが、圧電振動板４１の積層枚数や材質はこれに限るものではなく、供給された駆動信号によって圧電振動板４１が厚さ方向に振動するものであれば、他の圧電定数の圧電体であってもよい。
（６）
　前記実施形態では、イヤホン装置１０のイヤー挿入部１６は、使用者の耳介と外耳道との境目位の位置に挿入されるようにしたが、イヤー挿入部１６の先端側をテーパー形状にして、使用者の外耳道に積極的に挿入する構造としてもよい。
（７）
　前記実施形態では、ハウジング１１を樹脂材料によって底側ハウジング１２と蓋側ハウジング１３の２部材から構成するものを例に挙げたが、一体に形成されたものでもよい。
（８）
　前記実施形態によるイヤホン装置１０の振動源には、音を磁界によって発生させる電磁発生源がないため、ＭＲＩなど強磁場が発生する場所での使用が可能となる。 Further, the vibration state of the air generated in the internal space 14 differs depending on the shape of the weight provided at the free end of the piezoelectric diaphragm 41, so the sound emitted from the sound conduit 17 changes. Therefore, by appropriately selecting the shape and the mounting position of the weight, the earphone device 10 can be provided according to the needs of the user.
(3)
In the above embodiment, the piezoelectric diaphragm 41 is supported in a cantilever manner by the spacer 36. However, the present invention is not limited thereto. Both ends of the piezoelectric diaphragm 41 are supported by the spacer and the intermediate portion is used as a free end. It may be a structure to vibrate. At this time, a weight may be attached to the middle portion.
(4)
Although the present invention has described the canal type earphone device 10 in the above embodiment, the present invention is not limited to this, and an end of the housing 11 may be provided with a substantially "C" shaped clip rotating around the back of the ear. .
(5)
The piezoelectric diaphragm 41 according to the embodiment is formed by laminating the piezoelectric body in nine layers, and four substantially U-shaped electrodes 42 are provided at the left and right positions of the long side. The number of laminated piezoelectric vibrators 41 and the material thereof are not limited to this, and may be piezoelectric bodies having other piezoelectric constants as long as the piezoelectric vibrator 41 vibrates in the thickness direction by the supplied drive signal. It is also good.
(6)
In the above embodiment, the ear insertion portion 16 of the earphone device 10 is inserted at the position of the boundary between the pinna of the user and the ear canal, but the tip end side of the ear insertion portion 16 is tapered. It may be configured to be positively inserted into the ear canal of the user.
(7)
In the said embodiment, although what comprised the housing 11 from 2 members of the bottom side housing 12 and the lid side housing 13 with the resin material was mentioned as the example, what was integrally formed may be used.
(8)
The vibration source of the earphone device 10 according to the above embodiment does not have an electromagnetic generation source that generates sound by a magnetic field, so that it can be used at a place where a strong magnetic field such as MRI is generated.

Claims (4)

  1. 　電気信号を機械振動に変換する圧電振動板と、
    　前記圧電振動板を、その一部が固定端、他の部分が自由端となるように支持して内部空間内に収納するハウジングと、
    　前記ハウジングの内部空間に連通し、前記圧電振動板が発する空気振動を外部に導く音導管と、
    　前記圧電振動板の自由端に設けられる錘と、を具備した
    　ことを特徴とするイヤホン装置。     A piezoelectric diaphragm that converts an electrical signal into mechanical vibration;
    A housing for supporting the piezoelectric diaphragm so that a part thereof is a fixed end and the other part is a free end, and the housing is accommodated in an internal space;
    A sound conduit communicating with the internal space of the housing and guiding the air vibration generated by the piezoelectric diaphragm to the outside;
    An earphone device comprising: a weight provided at a free end of the piezoelectric diaphragm.
  2. 　請求項１記載のイヤホン装置において、
    　前記圧電振動板は平面が長方形状の板体として形成され、
    　前記ハウジングの内部空間は前記圧電振動板の長手方向に沿って細長く形成され、前記圧電振動板の自由端は前記ハウジングと前記音導管の接合部付近に位置するように形成されている
    　ことを特徴とするイヤホン装置。     In the earphone device according to claim 1,
    The piezoelectric diaphragm is formed as a plate having a rectangular flat surface,
    An inner space of the housing is formed to be elongated along a longitudinal direction of the piezoelectric diaphragm, and a free end of the piezoelectric diaphragm is formed to be located near a junction of the housing and the sound conduit. Earphone device.
  3. 　請求項２記載のイヤホン装置において、
    　前記音導管の前記接合部付近の内部空間に、前記錘が振動可能な状態で配置される
    　ことを特徴とするイヤホン装置。     In the earphone device according to claim 2,
    The earphone device according to claim 1, wherein the weight is arranged to be able to vibrate in an internal space in the vicinity of the junction of the sound conduit.
  4. 　前記圧電振動板の固有周波数ｆは、以下の数式によって設定される
    　ことを特徴とする請求項１乃至３いずれかに記載のイヤホン装置。
    Figure JPOXMLDOC01-appb-M000001
    　但し、
    　ｅ：ヤング率 (Ｎ／ｍ２)
    　ｂ：幅（ｍ）
    　ｌ：長さ（ｍ）
    　ｄ：厚さ（ｍ）
    　ｍ：錘の質量（ｋｇ）     The earphone device according to any one of claims 1 to 3, wherein the natural frequency f of the piezoelectric diaphragm is set by the following equation.
    Figure JPOXMLDOC01-appb-M000001
    However,
    e: Young's modulus (N / m 2 )
    b: Width (m)
    l: Length (m)
    d: Thickness (m)
    m: Weight of weight (kg)
PCT/JP2008/059530 2008-05-23 2008-05-23 Earphone apparatus WO2009141912A1 (en)

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