WO2017029828A1 - Générateur de sons, dispositif de génération de sons, et dispositif électronique - Google Patents

Générateur de sons, dispositif de génération de sons, et dispositif électronique Download PDF

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Publication number
WO2017029828A1
WO2017029828A1 PCT/JP2016/058072 JP2016058072W WO2017029828A1 WO 2017029828 A1 WO2017029828 A1 WO 2017029828A1 JP 2016058072 W JP2016058072 W JP 2016058072W WO 2017029828 A1 WO2017029828 A1 WO 2017029828A1
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WO
WIPO (PCT)
Prior art keywords
sound
sound generator
opening
plate member
generator
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Application number
PCT/JP2016/058072
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English (en)
Japanese (ja)
Inventor
長岡　聡史
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京セラ株式会社
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Publication date
Application filed by 京セラ株式会社 filed Critical 京セラ株式会社
Priority to JP2017535251A priority Critical patent/JPWO2017029828A1/ja
Publication of WO2017029828A1 publication Critical patent/WO2017029828A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
    • 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

Definitions

  • the present invention relates to a sound generator, a sound generator, and an electronic device.
  • an acoustic generator using a piezoelectric element is known (for example, see Patent Document 1).
  • Such an acoustic generator is configured to vibrate a diaphragm by applying a voltage to a piezoelectric element attached to the diaphragm to vibrate, and to output sound by actively utilizing resonance of the vibration.
  • Such sound generators are used as sound sources for liquid crystal televisions and personal computers.
  • a sound emitting hole (a slit structure opening) is provided on the wall surface of a liquid crystal television case for improving design, and a sound generator is attached so as to emit sound from the sound emitting hole.
  • An acoustic generator is used (for example, refer to Patent Documents 2 and 3).
  • JP 2001-16692 A Japanese Patent Laid-Open No. 2004-193749 International Publication No. 2012/063490
  • FIG. 1 shows an example of a sound generating device in which a sound generator of one example of the present embodiment is attached to a plate member having an opening
  • (a) is a plan view
  • (b) is a cross-sectional view along the line AA
  • (c) Is a cross-sectional view taken along line BB.
  • (A) is a general
  • (b) is a partial transmission side view of the acoustic generator shown in (a).
  • A) is a general
  • (b) is a partially permeable side view of the sound generator shown to (a).
  • FIG. 2 shows another example of a sound generator in which a sound member of another example of the present embodiment is attached to a plate member having an opening, (a) is a plan view, and (b) is a cross-sectional view taken along line AA. , (C) is a cross-sectional view taken along line BB.
  • FIG. 2 shows another example of a sound generator in which a sound member of another example of the present embodiment is attached to a plate member having an opening, (a) is a plan view, and (b) is a cross-sectional view taken along line AA.
  • FIG. 2 shows another example of a sound generator in which a sound member of another example of the present embodiment is attached to a plate member having an opening, (a) is a plan view, and (b) is a cross-sectional view taken along line AA. , (C) is a cross-sectional view taken along line BB.
  • FIG. 1 shows a sound generator in which a sound generator of an example of the present embodiment is attached to a plate member having an opening, (a) is a plan view, (b) is a cross-sectional view taken along line AA, c) is a cross-sectional view taken along line BB.
  • 2A is a schematic enlarged plan view of an example of the sound generator shown in FIG. 1, and FIG. 2B is a partially transparent side view of the sound generator shown in FIG.
  • the same reference numerals are used for the same components.
  • an acoustic generator 12 is attached to an inner wall surface 1 (hereinafter simply referred to as a wall surface 1) of a plate member 11 having an opening 10 so as to face the opening 10.
  • a wall surface 1 hereinafter simply referred to as a wall surface 1
  • the sound generator 41 includes a plate member 11 having an opening 10 and a sound generator 12 attached to the wall surface 1 of the plate member 11 so as to face the opening 10.
  • the acoustic generator 12 shown in FIGS. 1 and 2 includes a piezoelectric element 23, a diaphragm 22 to which the piezoelectric element 23 is attached, and a piezoelectric speaker having a frame 21 that supports an outer peripheral portion of at least one main surface of the diaphragm 22. 2 is provided.
  • the sound generator 12 is connected to the wall surface 1 of the plate member 11 having an opening at one end together with the fixing portion 31 that fixes the outer peripheral portion of the piezoelectric speaker 2, and is surrounded between the wall surface 1 and the piezoelectric speaker 2.
  • the holding member 3 including the frame-like portion 32 that forms a space is provided. Further, in the sound generator 12, the frame-like portion 32 includes an open portion 13 in which at least a part of the space is open. Below, the piezoelectric speaker 2 is demonstrated first.
  • the configuration of the piezoelectric element 23 used in the piezoelectric speaker 2 constituting the acoustic generator 12 of the present embodiment is not shown, but for example, a piezoelectric layer and an internal electrode layer are laminated to form a plate shape.
  • the laminated body was provided.
  • the piezoelectric element 23 includes an external electrode provided on the side surface from which the internal electrode layer of the multilayer body is derived, and a surface electrode connected to the external electrode and provided on the main surface of the multilayer body. .
  • the piezoelectric element 23 is attached to the main surface of the vibration plate 22 or the like, and excites the vibration plate 22 by vibrating under application of a voltage.
  • the piezoelectric layer constituting the piezoelectric element 23 is formed of ceramics having piezoelectric characteristics.
  • Conventionally used piezoelectric ceramics such as lead-free piezoelectric materials such as lead zirconate titanate, lithium niobate, lithium tantalate, Bi layered compounds, and tungsten bronze structure compounds are used as such ceramics. it can.
  • the thickness of the piezoelectric layer is set to 0.04 to 1.0 mm, for example. In order to obtain a large bending vibration, it is preferable to have a piezoelectric constant d31 of 200 pm / V or more.
  • the internal electrode layer constituting the piezoelectric element 23 is formed by simultaneous firing with the ceramic forming the piezoelectric layer. It consists of a first internal electrode layer and a second internal electrode layer, and is alternately laminated with piezoelectric layers to sandwich the piezoelectric layers from above and below.
  • a material for forming the internal electrode layer various metal materials can be used.
  • a conductor mainly composed of silver or silver-palladium that can be fired at a low temperature, or a conductor containing copper, platinum, or the like can be used, but these may contain a ceramic component or a glass component.
  • the internal electrode layer is made of a material containing a metal component composed of silver and palladium and a ceramic component that constitutes the piezoelectric layer, the stress due to the thermal expansion difference between the piezoelectric layer and the internal electrode layer is reduced. Therefore, it is possible to obtain the piezoelectric element 23 having no stacking failure.
  • a main body on the upper surface side and the lower surface side may be a plate-like body having a polygonal shape such as a rectangular shape or a square shape, or a circular shape or an elliptical shape.
  • the piezoelectric element 23 may have, for example, a monomorph structure with one piezoelectric layer, but preferably has a bimorph structure with two or more piezoelectric layers. Thereby, while contributing to thickness reduction, the diaphragm 22 can be efficiently vibrated with less energy. Further, in a bimorph structure in which the direction of displacement due to an electric field applied at a certain moment is reversed between the one side and the other side in the thickness direction, the piezoelectric element 23 itself undergoes flexural vibration, whereby the diaphragm Since the mechanical loss at the joint surface with 22 can be reduced, the sound pressure can be improved.
  • the diaphragm 22 can be formed using various materials such as resin and metal.
  • the diaphragm 22 can be made of a resin film such as polyethylene or polyimide having a thickness of 10 to 200 ⁇ m.
  • the piezoelectric element 23 is bonded to the diaphragm 22 with an adhesive such as an epoxy resin, an acrylic resin, or a rubber resin, and the diaphragm 22 vibrates due to the vibration of the piezoelectric element 23.
  • a wiring member (not shown) is connected to the surface electrode of the piezoelectric element 23, and an electric signal is input to the piezoelectric element 23 through this wiring member, so that the piezoelectric element 23 is in the in-plane direction (the main surface of the diaphragm 22 When the diaphragm 22 is extended in a direction parallel to the piezoelectric element 23, the diaphragm 22 itself is not displaced by an electric signal.
  • the diaphragm 22 is bent so as to be convex toward the piezoelectric element 23 side.
  • the piezoelectric element 23 contracts in the in-plane direction, and the vibration plate 22 itself is not displaced by the electric signal. Bend to be concave. That is, by applying an AC signal to the piezoelectric element 23, the piezoelectric element 23 can be expanded and contracted in the in-plane direction, and bending vibration can be applied to the diaphragm 22.
  • the frame body 21 is provided so as to support the outer peripheral portion of the main surface of the diaphragm 22.
  • the frame body 21 for example, a member whose inner peripheral shape and outer peripheral shape are rectangular can be used.
  • the frame body 21 is provided so as to sandwich both main surfaces of the diaphragm 22.
  • the thickness of the frame body 21 may be 100 to 5000 ⁇ m, for example.
  • various materials such as glass, a metal, and resin, can be used, for example.
  • glass or metal since the rigidity is high, the deformation is small and the sound quality is stable.
  • resin since it is less rigid than glass or metal and easily deforms due to vibration of the diaphragm 22, it is easy to induce spurious vibrations in the resonance of the diaphragm 22. Therefore, resonance peaks are dispersed in the sound pressure characteristics, and the peaks and dip can be reduced, and the frequency characteristics can be flattened. Therefore, the sound quality can be improved by flattening the sound pressure.
  • the frame body 21 is not particularly limited as long as it can support the diaphragm 22.
  • the outer peripheral shape of the frame body 21 is a rectangular shape and the inner peripheral shape is also a rectangular shape and the aspect ratio is larger than 1, it contributes to the dispersion of resonance. , Can contribute to reduction of peaks and dip.
  • it may be a polygon such as a square, a parallelogram, a trapezoid, and a regular n-gon, or a circle or an ellipse.
  • a resin layer 24 may be provided in the frame of the frame body 21 so as to cover the piezoelectric element 23.
  • FIGS. 1 and 2 show examples in which the resin layer 24 is provided.
  • a plate member 11 which is a part of the casing of the liquid crystal television is provided with an opening 10 having a slit structure as a sound emitting hole. It is set as the structure which emits a sound from 10 (sound emitting hole).
  • the piezoelectric speaker 2 is attached to the plate member 11 (wall surface 1) having the opening 10 so as to face the opening 10.
  • the acoustic generator 12 of the present embodiment includes a holding member 3 for attaching the piezoelectric speaker 2 to the plate member 11.
  • the holding member 3 fixes the outer peripheral portion of the piezoelectric speaker 2 and one end is connected to the wall surface 1 of the plate member 11 to form a space surrounded by the wall surface 1 of the plate member 11 and the piezoelectric speaker 2.
  • the holding member 3 includes a fixed portion 31 that fixes the outer peripheral portion of the piezoelectric speaker 2 and a frame-shaped portion 32 that is configured to form an open portion 13 in which at least a part of the space is open.
  • FIG. 1 an example in which the holding member 3 is configured by the fixed portion 31 and the frame-shaped portion 32 is illustrated, but these may be configured integrally.
  • the frame-shaped portion 32 is configured to form the open portion 13 in which at least a part of the space is open.
  • Sound generators are required to improve the sound quality of sound generated from openings (sound holes).
  • openings sound holes.
  • the opening of the slit structure is narrow, there is a problem that the high frequency sound cannot be sufficiently reproduced in the sound emitted from the sound emission hole, and it has been demanded that the high frequency sound can be sufficiently reproduced. .
  • the compression of sound between the sound generator 12 and the wall surface 1 of the plate member 11 having the opening 10 can be suppressed, and a low sound near the lowest resonance frequency of the sound generator 12 can be suppressed.
  • the frequency characteristics are flattened without being enhanced. Thereby, it can be set as the sound generator 12 excellent in the reproduction
  • the open portion 13 is a passage that connects an internal space inside the frame-shaped portion 32 and an external space outside the frame-shaped portion 32.
  • the open portion 13 has a shape provided so as to be cut out along the long side of a rectangular frame-like member in plan view.
  • the shape is not limited to such a shape, and may be a shape provided such that a part of the long side of the rectangular frame-shaped portion 32 is cut out in a plan view as shown in FIG. 4 may be a shape like a through-hole provided on the long side of the rectangular frame-shaped portion 32 in plan view.
  • the open portion 13 in the frame-shaped portion 32 is at least the size of the opening 10 of the plate member 11.
  • the opening portion 13 is larger in size than the opening portion 10 when the opening portion 13 and the opening portion 10 are viewed from the front.
  • the opening portion 13 has a larger opening area than the opening portion 10. Means. Thereby, a part of the sound generated by the piezoelectric speaker 2 is efficiently emitted from the open part 13 of the frame-shaped part 32, and an acoustic generator having excellent high-frequency sound reproduction capability can be obtained.
  • the opening part 13 of the frame-shaped part 32 is larger than the opening part 10, as shown in FIG.1 and FIG.2, the opening part 10 is a rectangular-shaped slit, Comprising:
  • the external shape of the shape part 32 is a rectangular shape, it is preferable that the open part 13 is made into the shape notched along the rectangular long side.
  • the fixing part 31 and the frame-like part 32 in the holding member 3 can be made of various materials such as metal, ABS, polystyrene, polypropylene, polycarbonate, and resins such as alloy resins thereof.
  • the open portion 13 may be formed by processing so as to cut out the frame-shaped portion 32, or may be formed in such a shape from the beginning by injection molding or the like.
  • FIG. 5A and 5B show a sound generator 42 in which the sound generator 16 of another example of the present embodiment is attached to the plate member 11 having the opening 10, wherein FIG. 5A is a plan view, and FIG. A cross-sectional view taken along line A, and (c) is a cross-sectional view taken along line BB.
  • the sound generator 42 shown in FIG. 5 is different from the sound generator 41 shown in FIG. 1 in that a frequency characteristic adjusting member 4 is provided on one end side of the holding member 3 in the sound generator 16.
  • the one end side of the holding member 3 means a portion located between the diaphragm 22 of the piezoelectric speaker 2 and the wall surface 1 of the plate member 11 in the fixing portion 31 or the frame-like portion 32 of the holding member 3. To do.
  • the frequency characteristic adjusting member 4 By providing the frequency characteristic adjusting member 4 on one end side of the holding member 3, the frequency characteristic adjusting member 4 partially blocks the reflection of sound. Thereby, the peak dip of the frequency characteristic due to sound reflection generated between the acoustic generator 14 and the wall surface 1 of the plate member 11 having the opening 10 can be further reduced.
  • the frequency characteristic adjusting member 4 only needs to block a part of the sound reflection generated between the piezoelectric speaker 2 and the wall surface 1 of the plate member 11 having the opening 10, and the shape, size, and number thereof are particularly limited. There is no limitation, and it may be appropriately adjusted according to the frequency characteristics of the sound generator 16.
  • two frequency characteristic adjusting members 4 connected to the fixed portion 31 are provided in a shape extending in the in-plane direction of the wall surface 1 of the plate member 11 so as to cross the opening 10 in the width direction.
  • it may be one, for example, and may be further connected to the frame part 32.
  • a plurality of piezoelectric elements 23 may be arranged so as to be positioned between these piezoelectric elements 23 in plan view.
  • the frequency characteristic adjusting member 4 may be made of a material that can block a part of sound reflection generated between the piezoelectric speaker 2 and the wall surface 1 of the plate member 11 having the opening 10. The same material as the part 31 can be used.
  • FIG. 6 shows a sound generator 43 in which the sound generator 17 of still another example of the present embodiment is attached to the plate member 11 having the opening 10, wherein (a) is a plan view and (b) is A. A cross-sectional view taken along line -A, and (c) is a cross-sectional view taken along line BB.
  • the one end side of the holding member 3 here also means a portion located between the diaphragm 22 of the piezoelectric speaker 2 and the wall surface 1 of the plate member 11 in the fixed portion 31 or the frame-like portion 32 of the holding member 3. .
  • the reflected sound related to the peak dip of the frequency characteristic can be absorbed by the sound absorbing material 5, and the frequency characteristic can be further flattened.
  • the sound absorbing material 5 only needs to be able to absorb a part of sound reflection generated between the sound generator 17 and the wall surface 1 of the plate member 11 having the opening 10, and the shape, size, and number thereof are not particularly limited. However, it may be adjusted appropriately according to the frequency characteristics of the sound generator 12.
  • FIG. 6 shows an example in which two frames are provided at both ends on one side of the frame-like portion 32. For example, four frames may be provided at all ends instead of only at one end. Furthermore, it may be provided along the inner surface of the frame-shaped portion 32.
  • the sound absorbing material 5 may be any material that absorbs part of the sound reflection generated between the sound generator 15 and the wall surface 1 of the plate member 11 having the opening 10.
  • urethane foam, foam rubber Cotton fiber or the like can be used.
  • FIG. 7 shows a sound generator 44 in which the sound generator 18 of still another example of the present embodiment is attached to the plate member 11 having the opening 10, (a) is a plan view, and (b) is A A cross-sectional view taken along line -A, and (c) is a cross-sectional view taken along line BB.
  • the sound generator 15 is attached so that the center of the opening 10 of the wall surface 1 and the center of the piezoelectric speaker 2 are shifted from each other. Since the frequency characteristics of the reflected sound generated between the wall member 1 and the wall surface 1 of the plate member 11 vary, the frequency characteristics can be made flatter.
  • the opening 10 is in a range inside the frame-shaped part 32 when viewed through a plane. It is preferable to make it shift within.
  • the attachment of the opening 10 so that the opening 10 is displaced within the range inside the frame-like portion 32, and the opening 10 It is preferable to attach so that the distance between and is different.
  • the distance between the open portion 13 of the frame-shaped portion 32 and the opening 10 of the plate member 11 is different, so that the resonance frequency depending on the distance between the wall surface 1 of the plate member 11 and the opening 10 is changed. Since there is no significant peak dip due to concentration, the frequency characteristics can be made flatter.
  • FIG. 8 is a block diagram illustrating an example of the electronic apparatus of the present embodiment.
  • the electronic device 50 of this example includes an acoustic generator 12, an electronic circuit 60 connected to the acoustic generator 12, and a housing 70 that houses the electronic circuit 60 and the acoustic generator 12. And having a function of generating sound from the sound generator 12.
  • the electronic device 50 includes a plate member in which a part of the housing 70 has an opening, and the opening is formed with respect to the plate member having an opening that is a part of the housing 70.
  • a sound generator is attached so as to oppose.
  • the electronic circuit 60 includes, for example, a controller 50a, a transmission / reception unit 50b, a key input unit 50c, and a microphone input unit 50d.
  • the electronic circuit 60 is connected to the sound generator 12 and has a function of outputting an audio signal to the sound generator 12.
  • the sound generator 12 generates sound based on the sound signal input from the electronic circuit 60.
  • the electronic device 50 includes a display unit 50e and an antenna 50f, and these are housed in the housing 70 including the above-described devices.
  • FIG. 8 shows a state in which each device including the controller 50a is accommodated in one casing 70, the accommodation form of each device is not limited. In the present embodiment, it is only necessary that at least the electronic circuit 60 and the sound generator 12 are accommodated in one housing 70.
  • the controller 50 a is a control unit of the electronic device 50.
  • the transmission / reception unit 50b transmits / receives data via the antenna 50f based on the control of the controller 50a.
  • the key input unit 50c is an input device of the electronic device 50 and accepts a key input operation by an operator.
  • the microphone input unit 50d is also an input device of the electronic device 50, and accepts a voice input operation by an operator.
  • the display unit 50e is a display output device of the electronic device 50, and outputs display information based on the control of the controller 50a.
  • the acoustic generator 12 operates as an acoustic output device in the electronic device 50.
  • the sound generator 12 is connected to the controller 50a of the electronic circuit 60, and emits sound upon application of a voltage controlled by the controller 50a.
  • the electronic device 50 is described as a portable terminal device.
  • the electronic device 50 is not limited to the type of the electronic device 50, and may be applied to various consumer devices having a function of emitting sound.
  • flat-screen televisions and car audio devices can of course be used for products having a function of generating sound, for example, various products such as vacuum cleaners, washing machines, refrigerators, microwave ovens, and the like.
  • the electronic device 50 according to the present embodiment described above includes the sound generator 12 having an excellent high frequency sound reproduction capability, the electronic device 50 having an excellent high frequency sound reproduction capability can be obtained. .
  • a long plate shape having a length of 297 mm, a width of 210 mm, and a thickness of 4 mm and a material made of ABS resin was prepared.
  • the opening was 28 mm in length, 3 mm in width, and 4 mm in thickness.
  • the piezoelectric speaker constituting a part of the sound generator has a length of 30 mm, a width of 10 mm, a thickness of 15 ⁇ m, a material made of polyetherimide, a length of 7 mm, a width of 6 mm, and a thickness of 0.1 mm.
  • a piezoelectric element made of a piezoelectric material is attached, and the main surface of the diaphragm is 30 mm in length, 10 mm in width, 1 mm in thickness with a square shape, the width of the square shape is 1 mm, and the material is stainless steel
  • a frame made of steel was attached. The piezoelectric element was embedded in the frame with a thermosetting epoxy resin.
  • the piezoelectric speaker is formed into a U-shape having a length of 34 mm, a width of 14 mm, and a thickness of 3 mm, a U-shaped width of 3 mm, and a material made of ABS.
  • a generator was produced, and this was bonded to the plate member with an adhesive so as to face the opening, thereby forming a first sound generator of the form as shown in FIGS.
  • the frequency characteristic adjusting material 4 is a plate having a length of 34 mm, a width of 3 mm, and a thickness of 1 mm, and two materials made of ABS, in-plane direction of the wall surface
  • a second sound generation device having a configuration as shown in FIG. 5 was produced by attaching to a holding member as a shape extending across the opening.
  • the second sound generator two sound absorbing materials having a length of 4 mm, a width of 4 mm, and a thickness of 1 mm are arranged at both ends on one side of the holding member as shown in FIG.
  • a third acoustic generator of the form was produced.
  • the material of the sound absorbing material was urethane foam.
  • the holding member and the sound generator are arranged with a shift of 2 mm in the long side direction from the center position of the opening of the wall surface, and the fourth sound generator having a form as shown in FIG. Produced.
  • a square-shaped holding member having a length of 34 mm, a width of 14 mm, and a thickness of 3 mm was bonded to the above piezoelectric speaker to produce a sound generator of a comparative example.
  • a frequency sweep test from 1 kHz to 100 kHz was performed on the piezoelectric element at a voltage of an effective value ⁇ 7 Vrms at a frequency of 1 kHz, and the frequency characteristics were measured.
  • FIG. 9 shows the results of the fourth sound generator.
  • the sound generator of this embodiment shown in FIG. 10 to FIG. 13 can reduce the peak around 10 kHz compared with the sound generator shown in FIG. It was confirmed that the sound generator was excellent in sound reproduction ability.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Abstract

La présente invention vise à fournir un générateur de sons, un dispositif de génération de sons, et un appareil électronique, dotés d'une excellente capacité de restitution sonore haute fréquence. Le générateur de sons 12 selon l'invention est fixé à un élément plat 11 et il est dirigé vers une ouverture 10 de l'élément de plaque 11. Le générateur de sons 12 comprend : un haut-parleur piézoélectrique 2 comprenant une membrane 22 à laquelle est fixé un élément piézoélectrique 23, et un cadre 21 qui supporte une partie périphérique extérieure d'au moins une surface principale de la membrane 22 ; et un élément de maintien 3 qui assure la fixation d'une partie périphérique extérieure du haut-parleur piézoélectrique 2 et dont une extrémité est reliée à l'élément plat 11 de sorte à former un espace clos entre l'élément plat 11 et le haut-parleur piézoélectrique 2. L'élément de maintien 3 comprend une partie en forme de cadre 32 configurée pour former une partie ouverte 13 via laquelle débouche au moins une partie de l'espace.
PCT/JP2016/058072 2015-08-20 2016-03-15 Générateur de sons, dispositif de génération de sons, et dispositif électronique WO2017029828A1 (fr)

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JP2017535251A JPWO2017029828A1 (ja) 2015-08-20 2016-03-15 音響発生器、音響発生装置ならびに電子機器

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JP2015162974 2015-08-20
JP2015-162974 2015-08-20

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08107594A (ja) * 1994-10-04 1996-04-23 Matsushita Electric Ind Co Ltd スピーカ装置
JPH10313499A (ja) * 1997-05-12 1998-11-24 Taiyo Yuden Co Ltd 圧電音響装置
WO2014024528A1 (fr) * 2012-08-10 2014-02-13 京セラ株式会社 Générateur de son, dispositif de génération de son, et dispositif électronique

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08107594A (ja) * 1994-10-04 1996-04-23 Matsushita Electric Ind Co Ltd スピーカ装置
JPH10313499A (ja) * 1997-05-12 1998-11-24 Taiyo Yuden Co Ltd 圧電音響装置
WO2014024528A1 (fr) * 2012-08-10 2014-02-13 京セラ株式会社 Générateur de son, dispositif de génération de son, et dispositif électronique

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