WO2016067708A1 - Sound generation device and sound generation device mounting structure - Google Patents

Sound generation device and sound generation device mounting structure Download PDF

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Publication number
WO2016067708A1
WO2016067708A1 PCT/JP2015/072512 JP2015072512W WO2016067708A1 WO 2016067708 A1 WO2016067708 A1 WO 2016067708A1 JP 2015072512 W JP2015072512 W JP 2015072512W WO 2016067708 A1 WO2016067708 A1 WO 2016067708A1
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Prior art keywords
case
side wall
sound
diaphragm
air chamber
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PCT/JP2015/072512
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French (fr)
Japanese (ja)
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山内　政和
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株式会社村田製作所
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Publication of WO2016067708A1 publication Critical patent/WO2016067708A1/en

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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
    • G10K9/122—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using piezoelectric driving means

Definitions

  • the present invention relates to a sounding device used for a buzzer or the like and a sounding device mounting structure.
  • Patent Document 1 an example of such a sounding device is disclosed.
  • the space in the case is divided vertically by a piezoelectric diaphragm. That is, an acoustic space above the piezoelectric diaphragm and an acoustic space below the piezoelectric diaphragm are provided. Accordingly, Helmholtz resonators are formed at the upper and lower portions of the piezoelectric diaphragm. Sound emitting holes are respectively provided in portions of the case facing the respective acoustic spaces.
  • the opening area of the sound emitting hole is limited to the area of the surface of the resonance chamber serving as the acoustic space, the opening area of the sound emitting hole cannot be increased depending on the frequency.
  • the opening area of the sound emitting hole is small, the sound pressure resistance increases. Therefore, the sound pressure could not be increased sufficiently.
  • An object of the present invention is to provide a sounding device and a sounding device mounting structure capable of sufficiently increasing sound pressure without causing an increase in the size of equipment to be mounted.
  • the sound producing device has a top plate and a side wall provided so as to extend downward from an outer peripheral edge of the top plate, and a case in which a lower end side of the side wall is opened, A support portion provided on an inner surface of the side wall of the case; and a diaphragm fixed to the case via the support portion; and the diaphragm and the side wall of the case at a lower portion of the diaphragm A first space is formed that is surrounded by and opened downward, and a notch is provided at the lower end of the side wall of the case.
  • a second space surrounded by the diaphragm, the top plate and the side wall of the case is formed on the upper part of the diaphragm,
  • a sound emitting hole is provided in a portion of the case facing the second space.
  • the Helmholtz resonator can be constituted by the second space and the sound emitting hole, and the sound pressure can be effectively increased.
  • the Helmholtz resonator is constituted by the resonance air chamber and the sound emitting hole connected to the resonance air chamber, and a resonance phenomenon occurs.
  • the resonance of the air chamber when simply expressing the resonance of the air chamber, it represents the resonance between the air chamber and the sound emitting hole connected to the air chamber when no doubt arises.
  • a plurality of the notches are provided at the lower end of the side wall of the case.
  • the sound emission part can be dispersed. Therefore, the sound pressure can be effectively equalized around the sound producing device.
  • the diaphragm includes a piezoelectric plate made of a piezoelectric body.
  • the sounding device can be sounded by an external electric signal.
  • the side wall of the case has a rectangular tube shape. In this case, the sound pressure can be effectively increased.
  • the side wall of the case is cylindrical. In this case, the sound pressure can be effectively increased.
  • the sound producing device mounting structure includes a mounting substrate and a sound producing device configured according to the present invention mounted on the mounting substrate, wherein the first space is the diaphragm and the case.
  • the sounding device is mounted from the lower end of the side wall of the case so as to be surrounded by the side wall and the mounting substrate. In this case, the first space as the resonance chamber can be enlarged. Therefore, the sound pressure can be effectively increased.
  • the present invention it is possible to provide a sounding device and a sounding device mounting structure capable of sufficiently increasing the sound pressure without causing an increase in the size of equipment to be mounted.
  • FIG. 1A and FIG. 1B are perspective views of a sound producing device according to the first embodiment of the present invention.
  • FIG. 2 is a cross-sectional view taken along line AA in FIG.
  • FIG. 3 is a cross-sectional view showing a cross section corresponding to a portion along the line AA in FIG. 1A of the sound producing device mounting structure as the second embodiment of the present invention.
  • FIG. 4 is a diagram showing the relationship between sound pressure and frequency in the second embodiment of the present invention.
  • 5 (a) and 5 (b) are perspective views of a sound producing device according to the third embodiment of the present invention.
  • FIG. 6A and FIG. 6B are perspective views of a sound producing device according to the fourth embodiment of the present invention.
  • FIG. 1 (a) and 1 (b) are perspective views of the sound producing device according to the first embodiment of the present invention.
  • FIG. 2 is a cross-sectional view taken along line AA in FIG.
  • the sounding device 1 has a case 2.
  • Case 2 has top plate 2a and side wall 2b provided so as to extend downward from the outer peripheral end of top plate 2a.
  • the side wall 2b has a rectangular tube shape and includes first to fourth side wall portions 2bA to 2bD.
  • the first side wall 2bA and the third side wall 2bC face each other, and the second side wall 2bB and the fourth side wall 2bD face each other.
  • the lower end side of the side wall 2b is opened.
  • a plurality of notches 2b2 are provided at the lower end 2b1 as the lower end of the side wall 2b. More specifically, one notch portion 2b2 is provided at each lower end portion of the first to fourth side wall portions 2bA to 2bD.
  • the notch 2b2 may be provided in at least one of the first to fourth side walls 2bA to 2bD.
  • the notch 2b2 has an elongated slit shape when viewed from the side, but this shape is not limited.
  • the notch 2b2 may have a semicircular shape.
  • Case 2 is made of an appropriate rigid material such as resin.
  • resin examples include syndiotactic polystyrene (SPS), polyphenylene sulfide (PPS), polybutylene terephthalate (PBT), and liquid crystal polymer (LCP).
  • SPS syndiotactic polystyrene
  • PPS polyphenylene sulfide
  • PBT polybutylene terephthalate
  • LCP liquid crystal polymer
  • a support portion 2 c is provided inside the side wall 2 b of the case 2.
  • the diaphragm 4 is fixed to the case 2 via the support portion 2c. More specifically, the diaphragm 4 is fixed to the case 2 by being joined to the support portion 2c with a conductive adhesive or the like.
  • the diaphragm 4 has a piezoelectric plate made of a piezoelectric body. More specifically, the piezoelectric plate is made of a piezoelectric ceramic such as PZT. What is necessary is just to set the thickness of a piezoelectric plate to the thickness according to the desired characteristic in 20 micrometers or more and several hundred micrometers or less.
  • the piezoelectric plate has first and second main surfaces.
  • a metal plate is affixed to the first main surface of the piezoelectric plate. More specifically, the metal plate has a first main surface, and the first main surface is bonded to the first main surface of the piezoelectric plate with an adhesive.
  • a material of the metal plate for example, 42 Alloy, SUS, brass or phosphor bronze is used.
  • a resin substrate having an elastic modulus of 1 GPa or more may be used instead of the metal plate. Examples of the resin substrate include a glass epoxy substrate. What is necessary is just to set the thickness of a metal plate or a resin board
  • the adhesive for example, an epoxy adhesive having an elastic modulus of 2.86 GPa is used.
  • Electrodes are formed on the first and second main surfaces of the piezoelectric plate.
  • the electrode for example, an Ag-baked electrode having a thickness of about 1 ⁇ m or a NiCu or Ag sputtering electrode having a thickness of 1 ⁇ m or less is used.
  • the diaphragm 4 is joined to the support portion 2c by the conductive adhesive at the portion where the electrode is formed.
  • the conductive adhesive is electrically connected to the connection wiring leading to the outside. Therefore, the diaphragm 4 is electrically connected to the outside through the electrode, the conductive adhesive, and the connection wiring. Thereby, the diaphragm 4 can be vibrated by an external electric signal, and the sound producing device 1 can be sounded.
  • a first space B is formed in the lower part of the diaphragm 4 and is surrounded by the diaphragm 4 and the side wall 2b of the case 2 and open downward.
  • a second space C that is surrounded by the diaphragm 4 and the top plate 2 a and the side wall 2 b of the case 2 is formed in the upper part of the diaphragm 4. That is, a second air chamber 6b is formed that forms a Helmholtz resonator having the second space C as a resonance air chamber.
  • the sound generating device 1 generates sound by the vibration of the diaphragm 4 and the resonance of the second air chamber 6b. Furthermore, by mounting the sound producing device 1 on the mounting substrate from the lower end 2b1 of the side wall 2b, a first air chamber that forms a Helmholtz resonator having the first space B as a resonance air chamber is also formed.
  • a sound emitting hole 3 is provided in the top plate 2a as a portion facing the second space C of the case 2.
  • the sound emitting hole 3 is provided with a step portion 3a by notching a part of the top plate 2a.
  • the step portion 3a is provided over two surfaces of the top plate 2a and the side wall 2b.
  • a part of the upper surface of the stepped portion 3a is the upper end of the side wall 2b.
  • the stepped portion 3a may not be provided.
  • the position of the sound emission hole 3 is not limited to the above, and may be provided in the portion facing the second space C in the case 2. For example, you may provide in the side wall 2b.
  • the planar shape of the sound emitting hole 3 is rectangular, but is not limited to this shape.
  • the sound emission hole 3 may have a planar shape such as a circle, for example.
  • the feature of this embodiment is that the case 2 is opened at the lower end side of the side wall 2b. Thereby, the sound pressure can be effectively increased. This will be described below by showing the sound producing device mounting structure as the second embodiment.
  • FIG. 3 is a cross-sectional view showing a cross section corresponding to a portion along the line AA in FIG. 1A of the sound producing device mounting structure as the second embodiment.
  • the sound producing device mounting structure 11 has a mounting substrate 15.
  • the sound generation device 1 according to the first embodiment is mounted on the mounting substrate 15. More specifically, the sound producing device 1 is mounted on the mounting substrate 15 from the lower end 2b1 of the side wall 2b of the case 2. Thereby, the opening on the lower end side of the side wall 2 b of the case 2 is closed by the mounting substrate 15. Therefore, the first space B is surrounded by the diaphragm 4, the side wall 2 b, and the mounting substrate 15. Therefore, a first air chamber 16a that is a Helmholtz resonator is formed below the diaphragm 4.
  • the lower end side of the case 2 is opened.
  • the case 2 does not have a bottom wall. Therefore, the total volume of the first air chamber 16a and the second air chamber 6b can be increased.
  • the volume of only one of the first air chamber 16a and the second air chamber 6b may be increased by adjusting the position of the support portion 2c of the case 2 and the vibration plate 4 in the height direction.
  • the volume of both the first and second air chambers 16a and 6b may be increased.
  • the first and second air chambers 16a and 6b constitute a Helmholtz resonator. Therefore, the sound pressure increases as the volume of the first and second air chambers 16a and 6b increases. Therefore, the sound pressure can be effectively increased.
  • the case 2 of the sound producing device 1 does not have a bottom wall, the dimension in the thickness direction can be reduced. Therefore, the sound generator 1 can be downsized. Therefore, the sound pressure can be effectively increased without increasing the size of the mounted device.
  • the dimension of the notch 2b2 of the case 2 is adjusted.
  • the opening area of the notch 2b2 for obtaining a desired resonance frequency depends on the volume of the first air chamber 16a. That is, as the volume of the first air chamber 16a increases, the opening area of the notch 2b2 also increases.
  • the resonance frequency of the second air chamber 6b the dimensions of the sound emission holes 3 are adjusted. As the volume of the second air chamber 6b increases, the opening area of the sound emission hole 3 also increases. In the present embodiment, at least one of the volume of the first air chamber 16a and the volume of the second air chamber 6b can be increased.
  • the opening area of at least one of the notch 2b2 and the sound emission hole 3 can be increased.
  • the sound pressure resistance in at least one of the first air chamber 16a and the second air chamber 6b can be reduced. Therefore, the sound pressure can be increased more effectively.
  • the larger the aperture area the higher the resonance frequency. Therefore, in order to lower the resonance frequency in the second air chamber 6b, the opening area of the sound emitting hole 3 is reduced.
  • the opening area of the sound emitting hole 3 can be made sufficiently large even if the resonance frequency is set to a lower frequency side. Therefore, the sound pressure resistance can be reduced, and the sound pressure can be effectively increased. Therefore, the sound generation device 1 can be suitably used for sound generation in the low range.
  • a notch 2b2 is provided at the lower end of each of the first to fourth side walls 2bA to 2bD of the case 2 shown in FIG. That is, the cutout portions 2b2 that are portions that emit sound when mounted are distributed. Therefore, the sound pressure can be effectively equalized around the sound producing device 1.
  • the cutout portion 2b2 only needs to be provided in at least one place.
  • it may be provided only at the lower end of the third side wall 2bC, or may be provided only at the lower end of each of the first and third side walls 2bA and 2bC facing each other.
  • the sound pressure is more uniform around the sound producing device when the notch portion 2b2 is provided at each lower end portion of the opposing side wall portions than at one location. be able to.
  • the cutout portions 2b2 are distributed and arranged at the lower ends of all the first to fourth side wall portions 2bA to 2bD, so that the sound pressure is made more uniform around the sound producing device 1. can do.
  • the sound generator is often driven by a rectangular wave signal.
  • the sound pressure can be increased by setting the frequency for driving the sound producing device 1 to the resonance frequency of the second air chamber 6b.
  • the drive signal includes frequency components that are three times and five times the drive frequency, so that sound waves emitted from the sound generator are three times and five times the drive frequency. Contains double frequency components.
  • the arrow H in FIG. 4 indicates the position of the resonance frequency of the first air chamber 16a. As shown in FIG.
  • the resonance frequency is set so that the three-fold frequency and the five-fold frequency are different from the resonance frequency of the first air chamber 16a.
  • the sound wave generated by the resonance of the first air chamber 16a does not contain many frequency components of the above 3 times and 5 times. Accordingly, the sound wave having the frequency component of 3 times and 5 times is not amplified. Therefore, the sound quality can be effectively improved.
  • the resonance frequency of the first air chamber 16a can be easily adjusted by adjusting the opening area of the notch 2b2 of the case 2 or adjusting the number of the notches 2b2. . Therefore, it is possible to easily match the above three times or five times the frequency with the resonance frequency of the first air chamber 16a. Thereby, the sound pressure can be increased. Therefore, the sound quality can be improved and the sound pressure can be increased according to the application.
  • 5 (a) and 5 (b) are perspective views of the sound producing device according to the third embodiment.
  • the sounding device 21 is different from the first embodiment in that the planar shape of the top plate 22a, the side wall 22b, and the diaphragm 24 of the case 22 is a polygonal shape having four vertices. More specifically, the planar shape is an octagon.
  • the side wall 22b has a rectangular tube shape and includes first to eighth side wall portions 22bA to 22bH.
  • the sound emitting hole 23 is different from the first embodiment in that the sound emitting hole 23 does not reach the side wall 22b, the step is not provided, and the planar shape of the sound emitting hole 23 is circular. Except for the above points, the configuration is the same as that of the first embodiment.
  • a first air chamber having a notch portion 22 b 2 provided in the lower end portion 22 b 1 as a sound emitting hole is formed. Since the case 22 does not have a bottom wall, the volume of at least one of the first air chamber and the second air chamber can be increased. Therefore, the sound pressure can be effectively increased.
  • the side wall 22b includes the first to eighth side wall portions 22bA to 22bH, but is not limited to the above configuration.
  • the side wall 22b may be in the shape of a square tube, and the side wall portion may be fewer than eight surfaces or more than eight surfaces.
  • 6 (a) and 6 (b) are perspective views of the sound producing device according to the fourth embodiment.
  • the sounding device 31 is different from the third embodiment in that the top plate 32a, the side wall 32b, and the diaphragm 34 of the case 32 have a circular planar shape. That is, the side wall 32b has a cylindrical shape and is composed of a single side wall.
  • the sound generator 31 is mounted on the mounting substrate from the lower end side of the case 32, thereby forming a first air chamber having a notch portion 32b2 provided in the lower end portion 32b1 as a sound emitting hole. Since the case 32 does not have a bottom wall, the volume of at least one of the first air chamber and the second air chamber can be increased. Therefore, the sound pressure can be effectively increased.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
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  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

Provided are a sound generation device and a sound generation device mounting structure capable of sufficiently increasing a sound pressure without an increase in the size of a device to which the sound generation device is mounted. A sound generation device 1 comprises: a case 2 which has a top board 2a and a side wall 2b extending downward from the outer periphery of the top board 2a, and is open on the lower end side of the side wall 2b; a support 2c provided on the inner surface of the side wall 2b of the case 2; and a diaphragm 4 secured to the case 2 via the support 2c. A first space B opening downward and surrounded by the diaphragm 4 and the side wall 2b of the case 2 is formed under the diaphragm (4). A notch 2b2 is provided at the lower end 2b1 of the side wall 2b of the case 2.

Description

発音装置及び発音装置実装構造体Sound generator and sound device mounting structure
　本発明は、ブザーなどに用いられる発音装置及び発音装置実装構造体に関する。 The present invention relates to a sounding device used for a buzzer or the like and a sounding device mounting structure.
　従来、発音装置が体温計や血糖値計をはじめとした電子機器などの報知音発生装置に広く用いられている。 Conventionally, sound generation devices have been widely used in notification sound generators such as electronic devices such as thermometers and blood glucose meters.
　例えば、下記の特許文献１では、このような発音装置の一例が開示されている。特許文献１の発音装置では、ケース内の空間が、圧電振動板により上下に分割されている。すなわち、圧電振動板上部の音響空間と圧電振動板下部の音響空間とが設けられている。それによって、圧電振動板の上部及び下部にヘルムホルツ共鳴器が構成されている。ケースの上記各音響空間に面した部分に放音孔がそれぞれ設けられている。 For example, in Patent Document 1 below, an example of such a sounding device is disclosed. In the sound generation device of Patent Document 1, the space in the case is divided vertically by a piezoelectric diaphragm. That is, an acoustic space above the piezoelectric diaphragm and an acoustic space below the piezoelectric diaphragm are provided. Accordingly, Helmholtz resonators are formed at the upper and lower portions of the piezoelectric diaphragm. Sound emitting holes are respectively provided in portions of the case facing the respective acoustic spaces.
特開２００３－００９２８６号公報JP 2003-009286 A
　特許文献１に記載の発音装置においてヘルムホルツ共鳴器の音圧を高くするためには、音響空間の容積を大きくする必要がある。しかしながら、体温計や血糖値計などの小型の電子機器では、発音装置が搭載される空間はかなり小さい。よって、音響空間の容積を充分に大きくすることはできなかった。 In order to increase the sound pressure of the Helmholtz resonator in the sound producing device described in Patent Document 1, it is necessary to increase the volume of the acoustic space. However, in a small electronic device such as a thermometer or a blood glucose meter, the space in which the sounding device is mounted is quite small. Therefore, the volume of the acoustic space cannot be increased sufficiently.
　さらに、ヘルムホルツ共鳴器の共鳴周波数を所望の周波数に設定するためには、放音孔の開口面積を調整する必要がある。しかしながら、放音孔の開口面積は音響空間となる共鳴気室の面の面積に制限されるため、周波数によっては、放音孔の開口面積を大きくすることができない。放音孔の開口面積が小さいと、音圧抵抗は大きくなる。よって、音圧を充分に高くすることができなかった。 Furthermore, in order to set the resonance frequency of the Helmholtz resonator to a desired frequency, it is necessary to adjust the opening area of the sound emission hole. However, since the opening area of the sound emitting hole is limited to the area of the surface of the resonance chamber serving as the acoustic space, the opening area of the sound emitting hole cannot be increased depending on the frequency. When the opening area of the sound emitting hole is small, the sound pressure resistance increases. Therefore, the sound pressure could not be increased sufficiently.
　本発明の目的は、搭載される機器の大型化を招くことなく、音圧を充分に高め得る、発音装置及び発音装置実装構造体を提供することにある。 An object of the present invention is to provide a sounding device and a sounding device mounting structure capable of sufficiently increasing sound pressure without causing an increase in the size of equipment to be mounted.
　本発明に係る発音装置は、天板と、前記天板の外周縁から下方に向かって延びるように設けられている側壁とを有し、かつ前記側壁の下端側が開口されているケースと、前記ケースの前記側壁の内面に設けられている支持部と、前記支持部を介して前記ケースに固定されている振動板とを備え、前記振動板の下部に、前記振動板と前記ケースの前記側壁とに囲まれており、かつ下方に開放されている第１の空間が形成されており、前記ケースの前記側壁の下端に切欠き部が設けられている。 The sound producing device according to the present invention has a top plate and a side wall provided so as to extend downward from an outer peripheral edge of the top plate, and a case in which a lower end side of the side wall is opened, A support portion provided on an inner surface of the side wall of the case; and a diaphragm fixed to the case via the support portion; and the diaphragm and the side wall of the case at a lower portion of the diaphragm A first space is formed that is surrounded by and opened downward, and a notch is provided at the lower end of the side wall of the case.
　本発明に係る発音装置のある特定の局面では、前記振動板の上部に、前記振動板と、前記ケースの前記天板及び前記側壁とに囲まれた第２の空間が形成されており、前記ケースにおける前記第２の空間に面した部分に放音孔が設けられている。この場合には、共鳴気室としての第２の空間を有する。よって、第２の空間と放音孔とでヘルムホルツ共鳴器を構成し、音圧を効果的に高め得る。上記のように、共鳴気室と、共鳴気室に接続されている放音孔とによりヘルムホルツ共鳴器が構成され、共鳴現象が生じる。本明細書において、単に、気室の共鳴と表現する場合には、疑義が生じない場合、気室と気室に接続されている放音孔とによる共鳴を表す。 In a specific aspect of the sound producing device according to the present invention, a second space surrounded by the diaphragm, the top plate and the side wall of the case is formed on the upper part of the diaphragm, A sound emitting hole is provided in a portion of the case facing the second space. In this case, it has the 2nd space as a resonance air chamber. Therefore, a Helmholtz resonator can be constituted by the second space and the sound emitting hole, and the sound pressure can be effectively increased. As described above, the Helmholtz resonator is constituted by the resonance air chamber and the sound emitting hole connected to the resonance air chamber, and a resonance phenomenon occurs. In this specification, when simply expressing the resonance of the air chamber, it represents the resonance between the air chamber and the sound emitting hole connected to the air chamber when no doubt arises.
　本発明に係る発音装置の他の特定の局面では、前記ケースの前記側壁の下端に複数の前記切欠き部が設けられている。この場合には、放音する部分を分散させることができる。よって、発音装置の周囲において音圧を効果的に均一化することができる。 In another specific aspect of the sound producing device according to the present invention, a plurality of the notches are provided at the lower end of the side wall of the case. In this case, the sound emission part can be dispersed. Therefore, the sound pressure can be effectively equalized around the sound producing device.
　本発明に係る発音装置のさらに他の特定の局面では、前記振動板が圧電体からなる圧電板を有する。この場合には、外部からの電気信号により、発音装置を発音させることができる。 In yet another specific aspect of the sound producing device according to the present invention, the diaphragm includes a piezoelectric plate made of a piezoelectric body. In this case, the sounding device can be sounded by an external electric signal.
　本発明に係る発音装置の別の特定の局面では、前記ケースの前記側壁が、角筒状である。この場合には、音圧を効果的に高め得る。 In another specific aspect of the sound producing device according to the present invention, the side wall of the case has a rectangular tube shape. In this case, the sound pressure can be effectively increased.
　本発明に係る発音装置のさらに別の特定の局面では、前記ケースの前記側壁が、円筒状である。この場合には、音圧を効果的に高め得る。 In yet another specific aspect of the sound producing device according to the present invention, the side wall of the case is cylindrical. In this case, the sound pressure can be effectively increased.
　本発明に係る発音装置実装構造体は、実装基板と、前記実装基板に実装されている本発明に従って構成されている発音装置とを備え、前記第１の空間が前記振動板、前記ケースの前記側壁及び前記実装基板に囲まれるように、前記発音装置が前記ケースの前記側壁の下端から実装されている。この場合には、共鳴気室としての第１の空間を大きくすることができる。よって、音圧を効果的に高め得る。 The sound producing device mounting structure according to the present invention includes a mounting substrate and a sound producing device configured according to the present invention mounted on the mounting substrate, wherein the first space is the diaphragm and the case. The sounding device is mounted from the lower end of the side wall of the case so as to be surrounded by the side wall and the mounting substrate. In this case, the first space as the resonance chamber can be enlarged. Therefore, the sound pressure can be effectively increased.
　本発明によれば、搭載される機器の大型化を招くことなく音圧を充分に高め得る、発音装置及び発音装置実装構造体を提供することができる。 According to the present invention, it is possible to provide a sounding device and a sounding device mounting structure capable of sufficiently increasing the sound pressure without causing an increase in the size of equipment to be mounted.
図１（ａ）及び図１（ｂ）は、本発明の第１の実施形態に係る発音装置の斜視図である。FIG. 1A and FIG. 1B are perspective views of a sound producing device according to the first embodiment of the present invention. 図２は、図１（ａ）中のＡ－Ａ線に沿う断面図である。FIG. 2 is a cross-sectional view taken along line AA in FIG. 図３は、本発明の第２の実施形態としての発音装置実装構造体の、図１（ａ）中のＡ－Ａ線に沿う部分に相当する断面を示す断面図である。FIG. 3 is a cross-sectional view showing a cross section corresponding to a portion along the line AA in FIG. 1A of the sound producing device mounting structure as the second embodiment of the present invention. 図４は、本発明の第２の実施形態における音圧と周波数との関係を示す図である。FIG. 4 is a diagram showing the relationship between sound pressure and frequency in the second embodiment of the present invention. 図５（ａ）及び図５（ｂ）は、本発明の第３の実施形態に係る発音装置の斜視図である。5 (a) and 5 (b) are perspective views of a sound producing device according to the third embodiment of the present invention. 図６（ａ）及び図６（ｂ）は、本発明の第４の実施形態に係る発音装置の斜視図である。FIG. 6A and FIG. 6B are perspective views of a sound producing device according to the fourth embodiment of the present invention.
　以下、図面を参照しつつ、本発明の具体的な実施形態を説明することにより、本発明を明らかにする。 Hereinafter, the present invention will be clarified by describing specific embodiments of the present invention with reference to the drawings.
　なお、本明細書に記載の各実施形態は、例示的なものであり、異なる実施形態間において、構成の部分的な置換または組み合わせが可能であることを指摘しておく。 It should be pointed out that each embodiment described in this specification is an example, and a partial replacement or combination of configurations is possible between different embodiments.
　図１（ａ）及び図１（ｂ）は、本発明の第１の実施形態に係る発音装置の斜視図である。図２は、図１（ａ）中のＡ－Ａ線に沿う断面図である。 1 (a) and 1 (b) are perspective views of the sound producing device according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line AA in FIG.
　発音装置１は、ケース２を有する。ケース２は、天板２ａと、天板２ａの外周端から下方に延びるように設けられている側壁２ｂとを有する。側壁２ｂは角筒状であり、第１～第４の側壁部２ｂＡ～２ｂＤを有する。第１の側壁部２ｂＡと第３の側壁部２ｂＣとは対向し合っており、第２の側壁部２ｂＢと第４の側壁部２ｂＤとは対向し合っている。 The sounding device 1 has a case 2. Case 2 has top plate 2a and side wall 2b provided so as to extend downward from the outer peripheral end of top plate 2a. The side wall 2b has a rectangular tube shape and includes first to fourth side wall portions 2bA to 2bD. The first side wall 2bA and the third side wall 2bC face each other, and the second side wall 2bB and the fourth side wall 2bD face each other.
　ケース２では、側壁２ｂの下端側が開口されている。側壁２ｂの下端としての下端部２ｂ１には、複数の切欠き部２ｂ２が設けられている。より具体的には、第１～第４の側壁部２ｂＡ～２ｂＤの各下端部に切欠き部２ｂ２が１つずつ設けられている。なお、切欠き部２ｂ２は、第１～第４の側壁部２ｂＡ～２ｂＤのうちの少なくとも１箇所に設けられておればよい。本実施形態では、切欠き部２ｂ２は側方から見て細長いスリット状の形状を有するが、この形状は限定されない。例えば、切欠き部２ｂ２は、半円状の形状であってもよい。 In case 2, the lower end side of the side wall 2b is opened. A plurality of notches 2b2 are provided at the lower end 2b1 as the lower end of the side wall 2b. More specifically, one notch portion 2b2 is provided at each lower end portion of the first to fourth side wall portions 2bA to 2bD. The notch 2b2 may be provided in at least one of the first to fourth side walls 2bA to 2bD. In the present embodiment, the notch 2b2 has an elongated slit shape when viewed from the side, but this shape is not limited. For example, the notch 2b2 may have a semicircular shape.
　ケース２は、樹脂などの適宜の剛性材料からなる。ケース２に用いられる樹脂としては、例えば、シンジオタクチックポリスチレン（ＳＰＳ）、ポリフェニレンサルファイド（ＰＰＳ）、ポリブチレンテレフタレート（ＰＢＴ）または液晶ポリマー（ＬＣＰ）などが挙げられる。 Case 2 is made of an appropriate rigid material such as resin. Examples of the resin used for Case 2 include syndiotactic polystyrene (SPS), polyphenylene sulfide (PPS), polybutylene terephthalate (PBT), and liquid crystal polymer (LCP).
　図２に示すように、ケース２の側壁２ｂの内側には、支持部２ｃが設けられている。支持部２ｃを介して、振動板４がケース２に固定されている。より具体的には、振動板４は、支持部２ｃに導電性接着剤などにより接合されることにより、ケース２に固定されている。 As shown in FIG. 2, a support portion 2 c is provided inside the side wall 2 b of the case 2. The diaphragm 4 is fixed to the case 2 via the support portion 2c. More specifically, the diaphragm 4 is fixed to the case 2 by being joined to the support portion 2c with a conductive adhesive or the like.
　振動板４は、圧電体からなる圧電板を有する。より具体的には、圧電板は、ＰＺＴなどの圧電セラミックスからなる。圧電板の厚みは２０μｍ以上、数百μｍ以下において、所望の特性に合わせた厚みに設定すればよい。 The diaphragm 4 has a piezoelectric plate made of a piezoelectric body. More specifically, the piezoelectric plate is made of a piezoelectric ceramic such as PZT. What is necessary is just to set the thickness of a piezoelectric plate to the thickness according to the desired characteristic in 20 micrometers or more and several hundred micrometers or less.
　上記圧電板は、第１，第２の主面を有する。圧電板の第１の主面には、金属板が貼り付けられている。より具体的には、金属板は第１の主面を有し、該第１の主面が圧電板の第１の主面に接着剤により接合されている。金属板の材料としては、例えば、４２　Ａｌｌｏｙ、ＳＵＳ、黄銅またはリン青銅などが用いられる。なお、金属板の代わりに、弾性率１ＧＰａ以上の樹脂基板を用いてもよい。樹脂基板としては、例えば、ガラスエポキシ基板などが挙げられる。金属板または樹脂基板の厚みは、数十μｍ以上、数百μｍ以下において、所望の特性に合わせた共振周波数となるように設定すればよい。なお、上記接着剤としては、例えば、弾性率２．８６ＧＰａのエポキシ系接着剤などが用いられる。 The piezoelectric plate has first and second main surfaces. A metal plate is affixed to the first main surface of the piezoelectric plate. More specifically, the metal plate has a first main surface, and the first main surface is bonded to the first main surface of the piezoelectric plate with an adhesive. As a material of the metal plate, for example, 42 Alloy, SUS, brass or phosphor bronze is used. A resin substrate having an elastic modulus of 1 GPa or more may be used instead of the metal plate. Examples of the resin substrate include a glass epoxy substrate. What is necessary is just to set the thickness of a metal plate or a resin board | substrate so that it may become the resonance frequency matched with the desired characteristic in several dozen micrometer or more and several hundred micrometers or less. As the adhesive, for example, an epoxy adhesive having an elastic modulus of 2.86 GPa is used.
　圧電板の第１，第２の主面には、電極が形成されている。電極としては、例えば、厚み１μｍ程度のＡｇ焼付電極、あるいは厚み１μｍ以下のＮｉＣｕまたはＡｇスパッタリング電極などが用いられる。振動板４は、電極が形成されている部分において上記導電性接着剤により支持部２ｃに接合されている。導電性接着剤は、外部に至る接続配線と電気的に接続されている。よって、振動板４は、電極、導電性接着剤及び上記接続配線を介して外部と電気的に接続されている。それによって、外部からの電気信号により振動板４を振動させ、発音装置１を発音させることができる。 Electrodes are formed on the first and second main surfaces of the piezoelectric plate. As the electrode, for example, an Ag-baked electrode having a thickness of about 1 μm or a NiCu or Ag sputtering electrode having a thickness of 1 μm or less is used. The diaphragm 4 is joined to the support portion 2c by the conductive adhesive at the portion where the electrode is formed. The conductive adhesive is electrically connected to the connection wiring leading to the outside. Therefore, the diaphragm 4 is electrically connected to the outside through the electrode, the conductive adhesive, and the connection wiring. Thereby, the diaphragm 4 can be vibrated by an external electric signal, and the sound producing device 1 can be sounded.
　振動板４の下部には、振動板４とケース２の側壁２ｂとに囲まれており、かつ下方が開放されている、第１の空間Ｂが形成されている。振動板４の上部には、振動板４とケース２の天板２ａ及び側壁２ｂとに囲まれている、第２の空間Ｃが形成されている。すなわち、第２の空間Ｃを共鳴気室とするヘルムホルツ共鳴器を作る第２の気室６ｂが構成されている。発音装置１は、振動板４の振動及び第２の気室６ｂの共鳴により発音する。さらに、発音装置１を側壁２ｂの下端部２ｂ１から実装基板に実装することにより、第１の空間Ｂを共鳴気室とするヘルムホルツ共鳴器を作る第１の気室も形成される。 A first space B is formed in the lower part of the diaphragm 4 and is surrounded by the diaphragm 4 and the side wall 2b of the case 2 and open downward. A second space C that is surrounded by the diaphragm 4 and the top plate 2 a and the side wall 2 b of the case 2 is formed in the upper part of the diaphragm 4. That is, a second air chamber 6b is formed that forms a Helmholtz resonator having the second space C as a resonance air chamber. The sound generating device 1 generates sound by the vibration of the diaphragm 4 and the resonance of the second air chamber 6b. Furthermore, by mounting the sound producing device 1 on the mounting substrate from the lower end 2b1 of the side wall 2b, a first air chamber that forms a Helmholtz resonator having the first space B as a resonance air chamber is also formed.
　ケース２の第２の空間Ｃに面した部分としての天板２ａには、放音孔３が設けられている。放音孔３には、天板２ａの一部を切り欠くことによって、段差部３ａが設けられている。段差部３ａは、天板２ａ及び側壁２ｂの２面にわたって設けられている。段差部３ａの上面の一部は、側壁２ｂの上端である。なお、段差部３ａは設けられていなくともよい。放音孔３の位置は上記に限定されず、ケース２において第２の空間Ｃに面した部分に設けられておればよい。例えば、側壁２ｂに設けられていてもよい。放音孔３の平面形状は矩形だが、この形状には限定されない。放音孔３は、例えば、円形などの平面形状を有していてもよい。 A sound emitting hole 3 is provided in the top plate 2a as a portion facing the second space C of the case 2. The sound emitting hole 3 is provided with a step portion 3a by notching a part of the top plate 2a. The step portion 3a is provided over two surfaces of the top plate 2a and the side wall 2b. A part of the upper surface of the stepped portion 3a is the upper end of the side wall 2b. The stepped portion 3a may not be provided. The position of the sound emission hole 3 is not limited to the above, and may be provided in the portion facing the second space C in the case 2. For example, you may provide in the side wall 2b. The planar shape of the sound emitting hole 3 is rectangular, but is not limited to this shape. The sound emission hole 3 may have a planar shape such as a circle, for example.
　本実施形態の特徴は、ケース２が側壁２ｂの下端側において開口されていることにある。それによって、音圧を効果的に高め得る。これを、第２の実施形態としての発音装置実装構造体を示すことにより、以下において説明する。 The feature of this embodiment is that the case 2 is opened at the lower end side of the side wall 2b. Thereby, the sound pressure can be effectively increased. This will be described below by showing the sound producing device mounting structure as the second embodiment.
　図３は、第２の実施形態としての発音装置実装構造体の図１（ａ）中のＡ－Ａ線に沿う部分に相当する断面を示す断面図である。 FIG. 3 is a cross-sectional view showing a cross section corresponding to a portion along the line AA in FIG. 1A of the sound producing device mounting structure as the second embodiment.
　発音装置実装構造体１１は、実装基板１５を有する。実装基板１５には、第１の実施形態に係る発音装置１が実装されている。より具体的には、発音装置１が、ケース２の側壁２ｂの下端部２ｂ１から実装基板１５に実装されている。それによって、ケース２の側壁２ｂの下端側の開口部が実装基板１５により閉じられている。よって、第１の空間Ｂは、振動板４、側壁２ｂ及び実装基板１５に囲まれている。従って、振動板４の下部に、ヘルムホルツ共鳴器である第１の気室１６ａが構成されている。 The sound producing device mounting structure 11 has a mounting substrate 15. The sound generation device 1 according to the first embodiment is mounted on the mounting substrate 15. More specifically, the sound producing device 1 is mounted on the mounting substrate 15 from the lower end 2b1 of the side wall 2b of the case 2. Thereby, the opening on the lower end side of the side wall 2 b of the case 2 is closed by the mounting substrate 15. Therefore, the first space B is surrounded by the diaphragm 4, the side wall 2 b, and the mounting substrate 15. Therefore, a first air chamber 16a that is a Helmholtz resonator is formed below the diaphragm 4.
　図３に示した発音装置１は、ケース２の下端側が開口されている。言い換えれば、ケース２は底壁を有していない。よって、第１の気室１６ａと第２の気室６ｂとの合計容積を大きくすることができる。ケース２の支持部２ｃ及び振動板４の高さ方向の位置を調整することにより、第１の気室１６ａ及び第２の気室６ｂのうちのいずれか一方のみの容積を大きくしてもよいし、第１，第２の気室１６ａ，６ｂの双方の容積を大きくしてもよい。前述したように、第１，第２の気室１６ａ，６ｂはヘルムホルツ共鳴器を構成するものである。よって、第１，第２の気室１６ａ，６ｂの容積が大きくなると、音圧は高くなる。従って、音圧を効果的に高め得る。 In the sounding device 1 shown in FIG. 3, the lower end side of the case 2 is opened. In other words, the case 2 does not have a bottom wall. Therefore, the total volume of the first air chamber 16a and the second air chamber 6b can be increased. The volume of only one of the first air chamber 16a and the second air chamber 6b may be increased by adjusting the position of the support portion 2c of the case 2 and the vibration plate 4 in the height direction. However, the volume of both the first and second air chambers 16a and 6b may be increased. As described above, the first and second air chambers 16a and 6b constitute a Helmholtz resonator. Therefore, the sound pressure increases as the volume of the first and second air chambers 16a and 6b increases. Therefore, the sound pressure can be effectively increased.
　さらに、発音装置１のケース２は底壁を有していないため、厚み方向の寸法を小さくすることができる。よって、発音装置１の小型化を図ることができる。従って、搭載される機器の大型化を招くことなく効果的に音圧を高め得る。 Furthermore, since the case 2 of the sound producing device 1 does not have a bottom wall, the dimension in the thickness direction can be reduced. Therefore, the sound generator 1 can be downsized. Therefore, the sound pressure can be effectively increased without increasing the size of the mounted device.
　ここで、第１の気室１６ａの共鳴周波数を調整するに際しては、ケース２の切欠き部２ｂ２の寸法の調整を行う。所望の共鳴周波数を得るための切欠き部２ｂ２の開口面積は、第１の気室１６ａの容積に依存している。すなわち、第１の気室１６ａの容積が大きくなると、切欠き部２ｂ２の開口面積も大きくなる。第２の気室６ｂの共鳴周波数を調整するに際しては、放音孔３の寸法の調整を行う。第２の気室６ｂの容積が大きくなると、放音孔３の開口面積も大きくなる。本実施形態では、第１の気室１６ａの容積及び第２の気室６ｂの容積のうちの少なくとも一方を大きくすることができる。そのため、切欠き部２ｂ２及び放音孔３のうちの少なくとも一方の開口面積を大きくすることができる。開口面積が大きいと、音圧抵抗は小さい。よって、第１の気室１６ａ及び第２の気室６ｂのうちの少なくとも一方における音圧抵抗を小さくすることができる。従って、音圧をより一層効果的に高め得る。 Here, when adjusting the resonance frequency of the first air chamber 16a, the dimension of the notch 2b2 of the case 2 is adjusted. The opening area of the notch 2b2 for obtaining a desired resonance frequency depends on the volume of the first air chamber 16a. That is, as the volume of the first air chamber 16a increases, the opening area of the notch 2b2 also increases. When adjusting the resonance frequency of the second air chamber 6b, the dimensions of the sound emission holes 3 are adjusted. As the volume of the second air chamber 6b increases, the opening area of the sound emission hole 3 also increases. In the present embodiment, at least one of the volume of the first air chamber 16a and the volume of the second air chamber 6b can be increased. Therefore, the opening area of at least one of the notch 2b2 and the sound emission hole 3 can be increased. When the opening area is large, the sound pressure resistance is small. Therefore, the sound pressure resistance in at least one of the first air chamber 16a and the second air chamber 6b can be reduced. Therefore, the sound pressure can be increased more effectively.
　ヘルムホルツ共鳴器においては、開口部の面積が大きいほど、共鳴周波数は高域に位置する。よって、第２の気室６ｂにおいて共鳴周波数を低めるには、放音孔３の開口面積を小さくする。本実施形態では、第２の気室６ｂの容積を大きくすることができるため、共鳴周波数をより低域側に設定しても、放音孔３の開口面積を充分な大きさにすることができるため、音圧抵抗を小さくすることができ、音圧を効果的に高め得る。従って、発音装置１は、低音域の発音においても好適に用いることができる。 In Helmholtz resonators, the larger the aperture area, the higher the resonance frequency. Therefore, in order to lower the resonance frequency in the second air chamber 6b, the opening area of the sound emitting hole 3 is reduced. In the present embodiment, since the volume of the second air chamber 6b can be increased, the opening area of the sound emitting hole 3 can be made sufficiently large even if the resonance frequency is set to a lower frequency side. Therefore, the sound pressure resistance can be reduced, and the sound pressure can be effectively increased. Therefore, the sound generation device 1 can be suitably used for sound generation in the low range.
　図１（ｂ）で示したケース２の第１～第４の側壁部２ｂＡ～２ｂＤのそれぞれの下端部には、切欠き部２ｂ２が設けられている。すなわち、実装された際に放音する部分となる切欠き部２ｂ２が分散して配置されている。従って、発音装置１の周囲において音圧を効果的に均一化することができる。 A notch 2b2 is provided at the lower end of each of the first to fourth side walls 2bA to 2bD of the case 2 shown in FIG. That is, the cutout portions 2b2 that are portions that emit sound when mounted are distributed. Therefore, the sound pressure can be effectively equalized around the sound producing device 1.
　なお、前述したように、切欠き部２ｂ２は少なくとも１箇所に設けられておればよい。例えば、第３の側壁部２ｂＣの下端部のみに設けられていてもよいし、対向し合う第１，第３の側壁部２ｂＡ，２ｂＣのそれぞれの下端部のみに設けられていてもよい。上記の例においては、切欠き部２ｂ２が１箇所のみに設けられているよりも、対向し合う側壁部のそれぞれの下端部に設けられているほうが、発音装置の周囲において音圧を均一化することができる。もっとも、本実施形態では、第１～第４の側壁部２ｂＡ～２ｂＤ全ての下端部に切欠き部２ｂ２が分散して配置されているため、発音装置１の周囲において音圧をより一層均一化することができる。 In addition, as described above, the cutout portion 2b2 only needs to be provided in at least one place. For example, it may be provided only at the lower end of the third side wall 2bC, or may be provided only at the lower end of each of the first and third side walls 2bA and 2bC facing each other. In the above example, the sound pressure is more uniform around the sound producing device when the notch portion 2b2 is provided at each lower end portion of the opposing side wall portions than at one location. be able to. However, in the present embodiment, the cutout portions 2b2 are distributed and arranged at the lower ends of all the first to fourth side wall portions 2bA to 2bD, so that the sound pressure is made more uniform around the sound producing device 1. can do.
　一般的に、コストを低め得るので、矩形波の信号により発音装置を駆動することが多い。ここで、発音装置１を駆動する周波数は、第２の気室６ｂの共鳴周波数に設定することで音圧を高め得る。一般に矩形波の信号により発音装置が駆動される場合、駆動信号には駆動周波数の３倍及び５倍の周波数成分が含まれ、これによって、発音装置が発する音波は、駆動周波数の３倍及び５倍の周波数成分を含む。上記３倍及び５倍の周波数成分の音波の振幅が大きくなると、音が濁るため、良好な音質を得ることができない。ここで、図４中の矢印Ｈは、第１の気室１６ａの共鳴周波数の位置を示す。図４に示すように、上記３倍及び５倍の周波数と第１の気室１６ａの共鳴周波数とを異ならせるように、該共鳴周波数が設定されていることが望ましい。それによって、第１の気室１６ａの共鳴による音波に上記３倍及び５倍の周波数成分を多く含むことがなくなる。従って、上記３倍及び５倍の周波数成分の音波が増幅されない。よって、効果的に音質を高めることができる。 Generally, since the cost can be reduced, the sound generator is often driven by a rectangular wave signal. Here, the sound pressure can be increased by setting the frequency for driving the sound producing device 1 to the resonance frequency of the second air chamber 6b. In general, when a sound generator is driven by a rectangular wave signal, the drive signal includes frequency components that are three times and five times the drive frequency, so that sound waves emitted from the sound generator are three times and five times the drive frequency. Contains double frequency components. When the amplitude of the sound wave having the frequency component of 3 times and 5 times becomes large, the sound becomes muddy, so that good sound quality cannot be obtained. Here, the arrow H in FIG. 4 indicates the position of the resonance frequency of the first air chamber 16a. As shown in FIG. 4, it is desirable that the resonance frequency is set so that the three-fold frequency and the five-fold frequency are different from the resonance frequency of the first air chamber 16a. As a result, the sound wave generated by the resonance of the first air chamber 16a does not contain many frequency components of the above 3 times and 5 times. Accordingly, the sound wave having the frequency component of 3 times and 5 times is not amplified. Therefore, the sound quality can be effectively improved.
　本実施形態では、ケース２の切欠き部２ｂ２の開口面積を調整し、あるいは切欠き部２ｂ２を設ける数を調整することにより、第１の気室１６ａの共鳴周波数を容易に調整することができる。よって、上記３倍または５倍の周波数と第１の気室１６ａの共鳴周波数とを容易に合わせることもできる。それによって、音圧を高めることができる。従って、用途に合わせて、音質を高めることもでき、音圧を高めることもできる。 In the present embodiment, the resonance frequency of the first air chamber 16a can be easily adjusted by adjusting the opening area of the notch 2b2 of the case 2 or adjusting the number of the notches 2b2. . Therefore, it is possible to easily match the above three times or five times the frequency with the resonance frequency of the first air chamber 16a. Thereby, the sound pressure can be increased. Therefore, the sound quality can be improved and the sound pressure can be increased according to the application.
　図５（ａ）及び図５（ｂ）は、第３の実施形態に係る発音装置の斜視図である。 5 (a) and 5 (b) are perspective views of the sound producing device according to the third embodiment.
　発音装置２１は、ケース２２の天板２２ａ、側壁２２ｂ及び振動板２４の平面形状が、頂点が４つではない多角形形状である点で第１の実施形態と異なる。より具体的には、上記平面形状は八角形である。側壁２２ｂは角筒状であり、第１～第８の側壁部２２ｂＡ～２２ｂＨを有する。放音孔２３が側壁２２ｂに至っていない点、段差部が設けられていない点及び放音孔２３の平面形状が円形形状である点においても、第１の実施形態と異なる。上記の点以外においては、第１の実施形態と同様の構成を有する。 The sounding device 21 is different from the first embodiment in that the planar shape of the top plate 22a, the side wall 22b, and the diaphragm 24 of the case 22 is a polygonal shape having four vertices. More specifically, the planar shape is an octagon. The side wall 22b has a rectangular tube shape and includes first to eighth side wall portions 22bA to 22bH. The sound emitting hole 23 is different from the first embodiment in that the sound emitting hole 23 does not reach the side wall 22b, the step is not provided, and the planar shape of the sound emitting hole 23 is circular. Except for the above points, the configuration is the same as that of the first embodiment.
　発音装置２１がケース２２の下端側から実装基板に実装されることで、下端部２２ｂ１に設けられている切欠き部２２ｂ２を放音孔とする第１の気室が形成される。ケース２２は底壁を有していないため、第１の気室及び第２の気室の少なくとも一方の容積を大きくすることができる。従って、音圧を効果的に高め得る。 When the sound producing device 21 is mounted on the mounting substrate from the lower end side of the case 22, a first air chamber having a notch portion 22 b 2 provided in the lower end portion 22 b 1 as a sound emitting hole is formed. Since the case 22 does not have a bottom wall, the volume of at least one of the first air chamber and the second air chamber can be increased. Therefore, the sound pressure can be effectively increased.
　なお、本実施形態では、側壁２２ｂは第１～第８の側壁部２２ｂＡ～２２ｂＨを有するが、上記構成には限定されない。側壁２２ｂは角筒状であればよく、側壁部は８面より少なくてもよく、あるいは８面より多くてもよい。 In this embodiment, the side wall 22b includes the first to eighth side wall portions 22bA to 22bH, but is not limited to the above configuration. The side wall 22b may be in the shape of a square tube, and the side wall portion may be fewer than eight surfaces or more than eight surfaces.
　図６（ａ）及び図６（ｂ）は、第４の実施形態に係る発音装置の斜視図である。 6 (a) and 6 (b) are perspective views of the sound producing device according to the fourth embodiment.
　発音装置３１は、ケース３２の天板３２ａ、側壁３２ｂ及び振動板３４の平面形状が円形である点で第３の実施形態と異なる。すなわち、側壁３２ｂは円筒状であり、単一の側壁部で構成されている。 The sounding device 31 is different from the third embodiment in that the top plate 32a, the side wall 32b, and the diaphragm 34 of the case 32 have a circular planar shape. That is, the side wall 32b has a cylindrical shape and is composed of a single side wall.
　発音装置３１がケース３２の下端側から実装基板に実装されることで、下端部３２ｂ１に設けられている切欠き部３２ｂ２を放音孔とする第１の気室が形成される。ケース３２は底壁を有していないため、第１の気室及び第２の気室の少なくとも一方の容積を大きくすることができる。従って、音圧を効果的に高め得る。 The sound generator 31 is mounted on the mounting substrate from the lower end side of the case 32, thereby forming a first air chamber having a notch portion 32b2 provided in the lower end portion 32b1 as a sound emitting hole. Since the case 32 does not have a bottom wall, the volume of at least one of the first air chamber and the second air chamber can be increased. Therefore, the sound pressure can be effectively increased.
　１…発音装置
　２…ケース
　２ａ…天板
　２ｂ…側壁
　２ｂ１…下端部
　２ｂ２…切欠き部
　２ｂＡ～２ｂＤ…第１～第４の側壁部
　２ｃ…支持部
　３…放音孔
　３ａ…段差部
　４…振動板
　６ｂ…第２の気室
　１１…発音装置実装構造体
　１５…実装基板
　１６ａ…第１の気室
　２１，３１…発音装置
　２２，３２…ケース
　２２ａ，３２ａ…天板
　２２ｂ，３２ｂ…側壁
　２２ｂ１，３２ｂ１…下端部
　２２ｂ２，３２ｂ２…切欠き部
　２２ｂＡ～２２ｂＨ…第１～第８の側壁部
　２３…放音孔
　２４，３４…振動板 DESCRIPTION OF SYMBOLS 1 ... Sound producing device 2 ... Case 2a ... Top plate 2b ... Side wall 2b1 ... Lower end part 2b2 ... Notch part 2bA-2bD ... 1st-4th side wall part 2c ... Support part 3 ... Sound emission hole 3a ... Step part 4 ... Vibration plate 6b ... second air chamber 11 ... sound generator mounting structure 15 ... mounting substrate 16a ... first air chamber 21,31 ... sound generator 22,32 ... case 22a, 32a ... top plate 22b, 32b ... side wall 22b1 , 32b1 ... lower end 22b2, 32b2 ... notch 22bA to 22bH ... first to eighth side walls 23 ... sound emitting holes 24, 34 ... diaphragm

Claims (7)

  1. 　天板と、前記天板の外周縁から下方に向かって延びるように設けられている側壁とを有し、かつ前記側壁の下端側が開口されているケースと、
    　前記ケースの前記側壁の内面に設けられている支持部と、
    　前記支持部を介して前記ケースに固定されている振動板とを備え、
    　前記振動板の下部に、前記振動板と前記ケースの前記側壁とに囲まれており、かつ下方に開放されている第１の空間が形成されており、
    　前記ケースの前記側壁の下端に切欠き部が設けられている、発音装置。     A case having a top plate and a side wall provided so as to extend downward from an outer peripheral edge of the top plate, and a lower end side of the side wall is opened;
    A support provided on the inner surface of the side wall of the case;
    A diaphragm fixed to the case via the support part,
    A first space surrounded by the diaphragm and the side wall of the case and opened downward is formed at a lower portion of the diaphragm,
    The sounding device, wherein a notch is provided at a lower end of the side wall of the case.
  2. 　前記振動板の上部に、前記振動板と、前記ケースの前記天板及び前記側壁とに囲まれた第２の空間が形成されており、前記ケースにおける前記第２の空間に面した部分に放音孔が設けられている、請求項１に記載の発音装置。 A second space surrounded by the vibration plate, the top plate and the side wall of the case is formed on the upper portion of the vibration plate, and is released to a portion of the case facing the second space. The sounding device according to claim 1, wherein a sound hole is provided.
  3. 　前記ケースの前記側壁の下端に複数の前記切欠き部が設けられている、請求項１または２に記載の発音装置。 The sounding device according to claim 1 or 2, wherein a plurality of the notches are provided at a lower end of the side wall of the case.
  4. 　前記振動板が圧電体からなる圧電板を有する、請求項１～３のいずれか１項に記載の発音装置。 The sounding device according to any one of claims 1 to 3, wherein the diaphragm includes a piezoelectric plate made of a piezoelectric body.
  5. 　前記ケースの前記側壁が、角筒状である、請求項１～４のいずれか１項に記載の発音装置。 The sounding device according to any one of claims 1 to 4, wherein the side wall of the case has a rectangular tube shape.
  6. 　前記ケースの前記側壁が、円筒状である、請求項１～４のいずれか１項に記載の発音装置。 The sounding device according to any one of claims 1 to 4, wherein the side wall of the case is cylindrical.
  7. 　実装基板と、
    　前記実装基板に実装されている請求項１～６のいずれか１項に記載の発音装置とを備え、
    　前記第１の空間が前記振動板、前記ケースの前記側壁及び前記実装基板に囲まれるように、前記発音装置が前記ケースの前記側壁の下端から実装されている、発音装置実装構造体。     A mounting board;
    The sound generating device according to any one of claims 1 to 6 mounted on the mounting substrate.
    The sound producing device mounting structure in which the sound producing device is mounted from the lower end of the side wall of the case so that the first space is surrounded by the diaphragm, the side wall of the case, and the mounting substrate.
PCT/JP2015/072512 2014-10-31 2015-08-07 Sound generation device and sound generation device mounting structure WO2016067708A1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50136366U (en) * 1974-04-25 1975-11-10
JPH0616997U (en) * 1992-08-04 1994-03-04 ティーディーケイ株式会社 Piezoelectric buzzer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50136366U (en) * 1974-04-25 1975-11-10
JPH0616997U (en) * 1992-08-04 1994-03-04 ティーディーケイ株式会社 Piezoelectric buzzer

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