WO2014024705A1 - Générateur acoustique, dispositif de génération de son et dispositif électronique - Google Patents

Générateur acoustique, dispositif de génération de son et dispositif électronique Download PDF

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Publication number
WO2014024705A1
WO2014024705A1 PCT/JP2013/070352 JP2013070352W WO2014024705A1 WO 2014024705 A1 WO2014024705 A1 WO 2014024705A1 JP 2013070352 W JP2013070352 W JP 2013070352W WO 2014024705 A1 WO2014024705 A1 WO 2014024705A1
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WIPO (PCT)
Prior art keywords
vibrating body
sound
shape
plan
generator
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PCT/JP2013/070352
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English (en)
Japanese (ja)
Inventor
弘 二宮
修一 福岡
徳幸 玖島
武 平山
実証 秋枝
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京セラ株式会社
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Publication of WO2014024705A1 publication Critical patent/WO2014024705A1/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
    • 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
    • H04R2400/00—Loudspeakers
    • H04R2400/03—Transducers capable of generating both sound as well as tactile vibration, e.g. as used in cellular phones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/11—Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's

Definitions

  • the disclosed embodiment relates to a sound generator, a sound generation device, and an electronic apparatus.
  • piezoelectric speakers are known as small and thin sound generators.
  • a conventional piezoelectric speaker for example, there is one including a rectangular frame, a film stretched on the frame, and a piezoelectric vibration element provided on the film (see, for example, Patent Document 1). ).
  • An object of the present invention is to provide a sound generator, a sound generator, and an electronic device.
  • An acoustic generator includes a frame, a vibration body provided inside the frame, and a piezoelectric vibration element provided on the vibration body, and the vibration body is planar.
  • the shape when viewed is a shape having a plurality of diagonal lines, and the lengths of at least two of the diagonal lines are different from each other.
  • the sound quality can be improved by reducing the fluctuation of the sound pressure in the frequency characteristic of the sound pressure.
  • FIG. 1A is an explanatory diagram in plan view of the sound generator according to the first embodiment.
  • 1B is a cross-sectional view taken along line A-A ′ of FIG. 1A.
  • FIG. 2A is a graph showing an example of the frequency dependence of the sound pressure of the sound generator according to the comparative example.
  • FIG. 2B is a graph showing an example of the frequency dependence of the sound pressure of the sound generator according to the first embodiment.
  • FIG. 3 is an explanatory diagram in plan view of an acoustic generator according to a comparative example.
  • FIG. 4 is a diagram for explaining the sound generator according to the second embodiment.
  • FIG. 5 is a diagram for explaining an electronic apparatus according to the third embodiment.
  • FIG. 6 is an explanatory diagram in plan view of the sound generator according to the fourth embodiment.
  • FIG. 7A is an explanatory diagram in plan view of the sound generator according to the fifth embodiment.
  • FIG. 7B is an explanatory diagram in plan view of the sound generator according to the sixth embodiment.
  • FIG. 8A is an explanatory diagram in plan view of the sound generator according to the seventh embodiment.
  • FIG. 8B is an explanatory diagram viewed from above the acoustic generator according to the eighth embodiment.
  • the acoustic generator 100 is a so-called piezoelectric speaker, and has a configuration for generating sound pressure using a resonance phenomenon of the vibrating body itself. That is, the acoustic generator 100 includes the frame body 10, the film 25, and the piezoelectric vibration element 30 as shown in FIGS. 1A and 1B.
  • the frame body 10 is composed of an upper frame member 11 and a lower frame member 12 having the same shape (rectangular frame shape). And the peripheral part of the film 25 is pinched
  • the vibrating body 20 is configured by a portion (a portion not sandwiched between the upper frame member 11 and the lower frame member 12) of the film 25 that is positioned inside the frame body 10.
  • a piezoelectric vibration element 30 is provided on the vibrating body 20.
  • the acoustic generator 100 of the present embodiment includes a frame body 10, a vibration body 20 provided inside the frame body 10, and two piezoelectric vibration elements 30 provided on the vibration body 20.
  • FIG. 1A is an explanatory view of the acoustic generator 100 according to the first embodiment viewed in plan from a direction perpendicular to the main surface of the vibrating body 20 (the thickness direction of the vibrating body 20), and FIG. 1A is a cross-sectional view taken along the line AA ′ of FIG. FIG. 1A shows a state where the resin layer 40 is seen through.
  • FIG. 1B in order to facilitate understanding, the sound generator 100 is shown expanded and deformed in the vertical direction.
  • the vibrating body 20 is viewed in plan, it is viewed from the thickness direction of the vibrating body 20 unless otherwise specified.
  • the film 25 in the sound generator 100 of the present embodiment is formed of a resin film, and is a material having a lower elastic modulus and mechanical Q value than a metal plate or the like. For this reason, the vibrating body 20 can be bent and vibrated with a large amplitude, and the resonance peak and dip level in the frequency characteristic of the sound pressure can be reduced. As a result, the frequency characteristics of sound pressure can be flattened, and excellent sound quality can be realized.
  • a resin film such as polyethylene or polyimide can be suitably used, and the thickness can be, for example, 10 to 200 ⁇ m.
  • the film 25 is not limited to a resin film, and can be formed using various known materials such as metal, ceramic, wood, paper, and the like.
  • the frame body 10 plays a role of holding the vibrating body 20 so as to vibrate, and fixes the vibrating body 20 in a state where a predetermined tension is applied to the vibrating body 20. That is, the vibrating body 20 is provided (tensed) inside the frame body 10 in a state where tension is applied. As a result, the acoustic generator 100 including the vibrating body 20 with less deformation such as deflection even when used for a long period of time is obtained.
  • the material of the frame 10 is not particularly limited, and various known materials such as metal, plastic, glass, ceramic, and wood can be used. However, the mechanical strength and the corrosion resistance are excellent. For example, stainless steel can be suitably used. Further, the thickness of the frame body 10 is not particularly limited, and can be appropriately set according to the situation. For example, the thickness can be set to about 100 to 1000 ⁇ m.
  • the piezoelectric vibration element 30 has a plate shape in which the upper and lower main surfaces are rectangular.
  • the piezoelectric vibration element 30 includes a laminate 33 in which four piezoelectric layers 31 (31a, 31b, 31c, 31d) and three internal electrode layers 32 (32a, 32b, 32c) are alternately laminated, Including surface electrode layers 34 and 35 formed on the upper and lower surfaces of the laminate 33, and first to third external electrodes provided at ends in the longitudinal direction (Y-axis direction) of the laminate 33. Yes.
  • the first external electrode 36 is disposed at the end of the laminate 33 in the ⁇ Y direction, and is connected to the surface electrode layers 34 and 35 and the internal electrode layer 32b.
  • a second external electrode 37 and a third external electrode (not shown) are disposed at an end in the + Y direction of the stacked body 33 with a gap in the X-axis direction.
  • the second external electrode 37 is connected to the internal electrode layer 32a, and the third external electrode (not shown) is connected to the internal electrode 32c.
  • Upper and lower end portions of the second external electrode 37 are extended to the upper and lower surfaces of the multilayer body 33 to form folded external electrodes 37a, respectively. These folded external electrodes 37a are formed on the surface of the multilayer body 33. In order not to contact the surface electrode layers 34 and 35, the surface electrode layers 34 and 35 are provided with a predetermined distance therebetween. Similarly, the upper and lower ends of the third external electrode (not shown) are extended to the upper and lower surfaces of the laminated body 33 to form folded external electrodes (not shown), respectively. (Not shown) is extended at a predetermined distance from the surface electrode layers 34 and 35 so as not to contact the surface electrode layers 34 and 35 formed on the surface of the multilayer body 33.
  • the piezoelectric layer 31 (31a, 31b, 31c, 31d) is polarized in the direction indicated by the arrow in FIG. 1B, and when the piezoelectric layers 31a, 31b contract, the piezoelectric layers 31c, 31d extend. In addition, when the piezoelectric layers 31a and 31b extend, a voltage is applied to the first external electrode 36, the second external electrode 37, and the third external electrode so that the piezoelectric layers 31c and 31d contract. .
  • the piezoelectric vibrating element 30 is a bimorph type piezoelectric element, and when an electric signal is input, the piezoelectric vibrating element 30 bends and vibrates in the Z-axis direction so that the amplitude changes in the Y-axis direction.
  • the piezoelectric layer 31 existing piezoelectric ceramics such as lead-free piezoelectric materials such as lead zirconate (PZ), lead zirconate titanate (PZT), Bi layered compounds, and tungsten bronze structure compounds can be used. .
  • the thickness of the piezoelectric layer 31 can be appropriately set according to desired vibration characteristics, but can be set to, for example, 10 to 100 ⁇ m from the viewpoint of low voltage driving.
  • the internal electrode layer 32 can be formed using various existing conductive materials.
  • the internal electrode layer 32 can include a metal component composed of silver and palladium and a material component constituting the piezoelectric layer 31. .
  • the ceramic component constituting the piezoelectric layer 31 in the internal electrode layer 32 it is possible to reduce stress due to the difference in thermal expansion between the piezoelectric layer 31 and the internal electrode layer 32.
  • the internal electrode layer 32 may not include a metal component composed of silver and palladium, and may not include a material component that constitutes the piezoelectric layer 31.
  • the surface electrode layers 34 and 35 and the first to third external electrodes can be formed using various existing conductive materials, and for example, contain a metal component made of silver and a glass component. Can do.
  • the surface electrode layers 34 and 35 and the first to third external electrodes, the piezoelectric layer 31 and the surface electrode layers 34 and 35 and the first to third external electrodes contain the glass component.
  • a strong adhesive force can be obtained with the internal electrode layer 32, but is not limited thereto.
  • the thickness of the adhesive layer 26 is preferably 20 ⁇ m or less, but more preferably 10 ⁇ m or less. When the thickness of the adhesive layer 26 is 20 ⁇ m or less, the vibration of the laminate 33 can be easily transmitted to the film 25.
  • the adhesive for forming the adhesive layer 26 known ones such as an epoxy resin, a silicon resin, and a polyester resin can be used.
  • a method for curing the resin used for the adhesive any method such as thermosetting, photocuring, and anaerobic curing may be used.
  • the acoustic generator 100 of the present embodiment at least a part of the surface of the vibrating body 20 is covered with a coating layer made of the resin layer 40.
  • a resin is filled inside the frame member 11 so that the vibrating body 20 and the piezoelectric vibrating element 30 are embedded, and the resin layer 40 is formed by the filled resin. Is formed.
  • the resin layer 40 an epoxy resin, an acrylic resin, a silicon resin, rubber, or the like can be used.
  • the resin layer 40 preferably covers the piezoelectric vibration element 30 completely from the viewpoint of suppressing a peak or a dip.
  • the piezoelectric vibration element 30 may not be completely covered.
  • the resin layer 40 does not necessarily need to cover the entire vibrating body 20, and in some cases, the resin layer 40 may be provided so as to cover a part of the vibrating body 20.
  • the thickness of the resin layer 40 can be set as appropriate, but is set to about 0.1 mm to 1 mm, for example. In some cases, the resin layer 40 may not be provided.
  • the resonance of the vibrating body 20 can be appropriately damped.
  • the peak or dip in the frequency characteristic of the sound pressure generated due to the resonance phenomenon can be suppressed to a small level, and the fluctuation of the sound pressure due to the frequency can be reduced.
  • the acoustic generator 100 has a trapezoidal shape having two diagonal lines when the vibrating body 20 is viewed in plan, and includes two diagonal lines L1 and L2. The length is different.
  • the shape when the vibrating body 20 is viewed in plan is a shape having a plurality of diagonal lines, and the lengths of at least two diagonal lines among the plurality of diagonal lines are the same. Since they are different from each other, symmetry in the shape of the vibrating body 20 can be reduced.
  • the degenerated vibration mode can be dispersed into a plurality of vibration modes, and one peak in the frequency characteristic of the sound pressure can be dispersed into a plurality of peaks, thereby reducing the level of each peak.
  • the fluctuation of the sound pressure in the frequency characteristic of the sound pressure can be reduced and the sound quality can be improved.
  • the resonance frequency of a plurality of vibration modes coincides, resulting in a problem that the peak level in the frequency characteristic of sound pressure increases.
  • the symmetry in the planar shape of the vibrating body 20 can be reduced, and thereby the resonance frequencies of a plurality of vibration modes can be dispersed.
  • the shape when the vibrating body 20 is viewed in plan is a quadrangle that does not have a 4-fold symmetrical center.
  • the shape of the vibrating body 20 when viewed in plan is not limited to a quadrangle having no 4-fold symmetry center, and an n-gon (n: an integer of 4 or more) having no n-fold symmetry center.
  • n-fold symmetry center means a point where a rotated figure overlaps with a figure before rotation when a two-dimensional figure is rotated by (360 / n) ° around that point.
  • n-gon having no n-fold symmetry center means an n-gon having no n-fold symmetry.
  • the shape when the vibrating body 20 is viewed in plan is a shape that does not have a line-symmetric axis of symmetry. As described above, by further reducing the symmetry in the shape of the vibrating body 20 when viewed in plan, it is possible to further disperse the peaks in the frequency characteristics of the sound pressure and further reduce the fluctuation of the sound pressure.
  • the acoustic generator 100 has a shape having a plurality of diagonal lines when the vibrating body 20 is viewed in plan, and the lengths of at least two of the diagonal lines are different from each other.
  • the shape of the vibrating body 20 when viewed in plan may be a shape that satisfies only the first condition, such as a regular hexagon, for example. The effect of reducing the fluctuation can be obtained.
  • the shape of the vibrating body 20 when viewed in plan may be a shape that satisfies the first condition and the second condition and does not satisfy the third condition, such as a rhombus. It is possible to obtain an effect of reducing fluctuations in sound pressure by dispersing peaks in the frequency characteristics.
  • the degree to which the lengths of the diagonal lines are varied can be appropriately set according to the desired effect. For example, even if the length of the diagonal line is varied by about 0.1%, a corresponding effect can be obtained, but when a certain degree of effect is desired, the length of the diagonal line can be varied by about 1% or more. Desirably, when a great effect is desired, it is desirable to make the length of the diagonal line different by about 10% or more.
  • FIG. 2A is a graph showing an example of the frequency characteristic of the sound pressure of the sound generator 101 according to the comparative example whose shape is shown in FIG. 3, and FIG. 2B is the sound pressure of the sound generator 100 according to the present embodiment. It is a graph which shows an example of a frequency characteristic.
  • FIG. 3 is an explanatory diagram in plan view of the acoustic generator 101 according to the comparative example, and shows a state in which the resin layer 40 is seen through as in FIG. 1A.
  • the horizontal axis indicates the frequency
  • the vertical axis indicates the sound pressure.
  • the acoustic generator 101 is provided with a vibrating body 120 inside a frame 110 having a rectangular shape inside the frame, and when the vibrating body 120 is viewed in plan view.
  • the shape is rectangular. Therefore, the lengths of the two diagonals L10 and L20 of the shape when the vibrating body 120 is viewed in plan are equal.
  • the shape of the vibrating body 120 when viewed from above is a quadrangle having a 4-fold symmetrical center.
  • the shape when the vibrating body 120 is viewed in plan has two symmetrical axes of line symmetry.
  • the shape of the vibrating body 120 when viewed in plan is a structure with very high symmetry.
  • the sound generator 100 has a reduced peak or dip in the frequency characteristic of sound pressure, and fluctuations in sound pressure are reduced. I understand.
  • the piezoelectric vibration element 30 is prepared. First, a binder, a dispersant, a plasticizer, and a solvent are kneaded with the piezoelectric material powder to prepare a slurry.
  • a binder, a dispersant, a plasticizer, and a solvent are kneaded with the piezoelectric material powder to prepare a slurry.
  • the piezoelectric material any of lead-based and non-lead-based materials can be used.
  • the slurry is formed into a sheet to produce a green sheet.
  • a conductor paste is printed on this green sheet to form a conductor pattern to be an internal electrode, three green sheets on which this electrode pattern is formed are stacked, and a green pattern on which no polar pattern is printed Sheets are laminated to produce a laminated molded body.
  • the laminated body 33 is obtained by degreasing and baking the laminated molded body and cutting it into predetermined dimensions.
  • the outer peripheral portion of the multilayer body 33 is processed, and a conductive paste for forming the surface electrode layers 34 and 35 is printed on both main surfaces in the stacking direction of the multilayer body 33.
  • a conductor paste for forming the first to third external electrodes is printed on both end faces in the longitudinal direction (Y-axis direction) of the electrode, and the electrodes are baked at a predetermined temperature. In this way, the piezoelectric vibration element 30 shown in FIGS. 1A and 1B can be obtained.
  • a DC voltage is applied through the first to third external electrodes to polarize the piezoelectric layer 31 of the piezoelectric vibration element 30.
  • Such polarization is performed by applying a DC voltage so as to be in the direction indicated by the arrow in FIG. 1B.
  • the film 25 is prepared, the outer peripheral portion of the film 25 is sandwiched between the frame members 11 and 12, and the film 25 is fixed in a tensioned state. Thereafter, an adhesive to be the adhesive layer 26 is applied to the film 25, the surface electrode 34 side of the piezoelectric vibration element 30 is pressed onto the film 25, and then the adhesive is heated or irradiated with ultraviolet rays. To cure. Then, the resin layer 40 is formed by pouring the uncured resin inside the frame member 11 and curing the resin. In this way, the sound generator 100 of the present embodiment can be manufactured.
  • FIG. 4 is a diagram illustrating an example of the configuration of the sound generation device 70 configured using the sound generator 100 of the first embodiment described above. In FIG. 4, only the components necessary for the description are shown, and the detailed configuration and general components of the sound generator 100 are omitted.
  • the sound generator 70 of the present embodiment is a so-called speaker-like sounding device, and includes, for example, a housing 71 and a sound generator 100 attached to the housing 71 as shown in FIG.
  • the casing 71 has a rectangular parallelepiped box shape, and has an opening 71a on one surface.
  • a casing 71 can be formed using a known material such as plastic, metal, or wood.
  • casing 71 is not limited to a rectangular parallelepiped box shape, For example, it can be set as various shapes, such as cylindrical shape and frustum shape.
  • the sound generator 100 is attached to the opening 71a of the casing 71.
  • the sound generator 100 is the sound generator of the first form described above, and a description of the sound generator 100 is omitted. Since the sound generator 70 having such a configuration generates sound using the sound generator 100 that generates sound with high sound quality, it is possible to generate sound with high sound quality. Moreover, since the sound generator 70 can resonate the sound generated from the sound generator 100 inside the casing 71, for example, the sound pressure in a low frequency band can be increased. In addition, the place where the sound generator 100 is attached can be set freely. Further, the sound generator 100 may be attached to the housing 71 via another object.
  • FIG. 5 is a diagram illustrating an example of the configuration of the electronic device 2 configured using the acoustic generator 100 of the first embodiment described above. In FIG. 5, only the components necessary for the description are shown, and the detailed configuration and general components of the sound generator 100 are omitted.
  • the electronic device 2 includes a housing 200, a sound generator 100 provided in the housing 200, and an electronic circuit connected to the sound generator 100.
  • the electronic device 2 includes an electronic circuit including a control circuit 21, a signal processing circuit 22, and a communication circuit 23, an antenna 24, and a housing 200 that stores these. I have.
  • the communication circuit 23 receives a signal input from the antenna and outputs it to the signal processing circuit 22.
  • the signal processing circuit 22 processes the signal input from the communication circuit 23 to generate an audio signal S and outputs it to the sound generator 100.
  • the sound generator 100 generates sound based on the sound signal S.
  • the control circuit 21 controls the entire electronic device 2 including the signal processing circuit 22 and the communication circuit 23.
  • the electronic device 2 having such a configuration includes the sound generator 100 capable of generating high-quality sound with small fluctuations in sound pressure in the frequency characteristics of sound pressure, the high-quality sound can be obtained. Can be generated.
  • the sound generation device 70 in which the sound generator 100 is attached to the housing 71 may be configured to be attached to the housing 200 of the electronic device 2.
  • the electronic device 2 on which such a sound generator 100 is mounted is not limited to those conventionally known as electronic devices that generate sound, such as a mobile phone, a tablet terminal, a television, and an audio device.
  • the electronic device 2 on which the sound generator 100 is mounted may be an electrical product such as a refrigerator, a microwave oven, a vacuum cleaner, a washing machine, and the like.
  • FIG. 6 is an explanatory view of the acoustic generator 102 according to the fourth embodiment viewed in plan from the thickness direction of the vibrating body 20, and shows a state where the resin layer 40 is seen through, as in FIG. 1A.
  • the sound generator 100 of the first embodiment described above only differences from the sound generator 100 of the first embodiment described above will be described, and the same components will be denoted by the same reference numerals, and redundant description will be omitted.
  • the shape when the vibrating body 20 is viewed in plan (the same shape as the shape inside the frame body 10) is a pentagon that is not a regular pentagon.
  • the shape of the vibrating body 20 when viewed in plan is a shape in which one of rectangular corners is cut off to form a pentagon.
  • the shape of the vibrating body 20 when viewed in plan has five diagonal lines L11 to L15, and the lengths of the five diagonal lines are all different.
  • the shape of the vibrating body 20 when viewed in plan is a pentagon having no 5-fold symmetry center.
  • the shape of the vibrating body 20 when viewed in plan is a shape that does not have a line-symmetric axis of symmetry.
  • the shape of the vibrating body 20 in plan view is such that the shape of the frame body 10 is projected inward in a triangular shape at one corner inside the rectangular frame. This is realized by forming the region 13 into a shape.
  • the acoustic generator 102 can solve the contraction of the resonance mode of the vibrating body 20 by making the shape of the vibrating body 20 when viewed from above low in symmetry. Therefore, it is possible to generate high-quality sound in which fluctuations in sound pressure due to frequency are reduced.
  • FIG. 7A is an explanatory diagram of the acoustic generator 103 according to the fifth embodiment viewed in plan from a direction perpendicular to the main surface of the vibrating body 20 (thickness direction of the vibrating body 20). As in FIG. The state seen through the layer 40 is shown.
  • the sound generator 100 of the first embodiment described above only differences from the sound generator 100 of the first embodiment described above will be described, and the same components will be denoted by the same reference numerals, and redundant description will be omitted.
  • the shape when the vibrating body 20 is viewed in plan is a shape having two diagonal lines L31 and L32, and the lengths of the two diagonal lines L31 and L32 are different from each other. Yes. Further, the shape of the vibrating body 20 when viewed in plan is a quadrangle that does not have a 4-fold symmetrical center. Further, the shape of the vibrating body 20 when viewed in plan is a shape that does not have a line-symmetric axis of symmetry.
  • the acoustic generator 103 of this example having such a configuration has low symmetry of the shape when the vibrating body 20 is viewed in plan, the sound pressure is the same as that of the acoustic generator 100 of the first embodiment described above. It is possible to generate high-quality sound in which fluctuations in sound pressure in the frequency characteristics are reduced.
  • FIG. 7B is an explanatory view in plan view of the acoustic generator 104 according to the sixth embodiment from a direction perpendicular to the main surface of the vibrating body 20 (thickness direction of the vibrating body 20). Similarly to FIG. The state seen through the layer 40 is shown.
  • the sound generator 100 of the first embodiment described above will be described, and the same components will be denoted by the same reference numerals, and redundant description will be omitted.
  • the acoustic generator 104 has a rhombus shape when the vibrating body 20 is viewed in plan, and the lengths of the two diagonal lines L41 and L42 are different from each other. Further, the shape of the vibrating body 20 when viewed in plan is a quadrangle that has a center of two-fold symmetry and a line-symmetric symmetry axis but does not have a four-fold symmetry axis.
  • the acoustic generator 103 of this example having such a configuration has a lower degree of symmetry of the shape when the vibrating body 20 is viewed in plan, and thus is lower than the acoustic generator of the first embodiment described above. However, it is possible to generate high-quality sound in which fluctuations in sound pressure in the frequency characteristics of sound pressure are reduced.
  • FIG. 8A is an explanatory view of the acoustic generator 105 according to the seventh embodiment viewed in plan from a direction perpendicular to the main surface of the vibrating body 20 (thickness direction of the vibrating body 20). Similarly to FIG. The state seen through the layer 40 is shown.
  • the sound generator 100 of the first embodiment described above only differences from the sound generator 100 of the first embodiment described above will be described, and the same components will be denoted by the same reference numerals, and redundant description will be omitted.
  • the acoustic generator 105 has nine diagonal lines L51 to L59 when the vibrating body 20 is viewed in plan, and the nine diagonal lines L51 to L59 are among the nine diagonal lines L51 to L59. At least two diagonals have different lengths.
  • the shape of the vibrating body 20 when viewed in plan is a hexagon that does not have a 6-fold symmetry center.
  • the shape of the vibrating body 20 when viewed in plan is a shape that does not have a line-symmetric axis of symmetry.
  • the acoustic generator 105 of this example having such a configuration has low symmetry of the shape when the vibrating body 20 is viewed in plan, the sound pressure is the same as that of the acoustic generator 100 of the first embodiment described above. It is possible to generate high-quality sound in which fluctuations in sound pressure in the frequency characteristics are reduced.
  • FIG. 8B is an explanatory view in plan view of the acoustic generator 106 according to the eighth embodiment from a direction perpendicular to the main surface of the vibrating body 20 (thickness direction of the vibrating body 20).
  • FIG. 1A FIG. The state seen through the layer 40 is shown.
  • the sound generator 100 of the first embodiment described above only differences from the sound generator 100 of the first embodiment described above will be described, and the same components will be denoted by the same reference numerals, and redundant description will be omitted.
  • the acoustic generator 106 has nine diagonal lines L61 to L69 when the vibrating body 20 is viewed in plan, and among the nine diagonal lines L61 to L69, The lengths of at least two diagonal lines are different from each other.
  • the shape of the vibrating body 20 when viewed in plan is a hexagon that does not have a 6-fold symmetry center.
  • the shape of the vibrating body 20 when viewed in plan is a shape that does not have a line-symmetric axis of symmetry.
  • the acoustic generator 106 of this example having such a configuration has low symmetry of the shape when the vibrating body 20 is viewed in plan, the sound pressure is the same as that of the acoustic generator 100 of the first embodiment described above. It is possible to generate high-quality sound in which fluctuations in sound pressure in the frequency characteristics are reduced.
  • the case where the vibration body 20 is viewed in plan is a quadrangle, pentagon, or hexagon.
  • the shape is not limited to this, and may be another polygon.
  • the polygonal vertex may be rounded or the corner of the vertex may be cut off, and any shape that is regarded as a polygon may be used if not strictly.
  • the whole or part of the side of the vibrating body 20 is a curved line.
  • piezoelectric vibration elements 30 are disposed on the vibrating body 20, but one or three or more piezoelectric vibration elements 30 may be disposed.
  • the piezoelectric vibration element 30 has a rectangular shape in plan view, it may have another shape such as an elliptical shape.
  • the piezoelectric vibration element 30 a so-called bimorph type laminated type is exemplified, but the piezoelectric vibration element 30 is not limited to this.
  • the same effect can be obtained by using a unimorph type piezoelectric vibration element in which a plate made of metal or the like is attached to one main surface of a piezoelectric vibration element that expands and contracts in a plane direction instead of a bimorph type piezoelectric vibration element. Can be obtained.
  • piezoelectric vibration elements that stretch and vibrate in the plane direction may be provided on both surfaces of the film 25, or unimorph type or bimorph type piezoelectric vibration elements may be provided on both surfaces of the film 25.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)

Abstract

La présente invention concerne un générateur acoustique qui est apte à générer un son de qualité élevée ayant une faible fluctuation associée à une fréquence de pression sonore, un dispositif de génération de son et un dispositif électronique. Le générateur acoustique de la présente invention est équipé d'un corps de cadre, un corps vibrant qui est situé sur le côté intérieur du corps de cadre et un corps vibrant piézoélectrique qui est situé sur le corps vibrant. Pour le générateur acoustique, le corps vibrant présente une forme ayant de multiples diagonales lorsqu'il est observé dans une vue en plan et au moins deux diagonales parmi les multiples diagonales ont des longueurs différentes les unes par rapport aux autres. Le dispositif de génération de son et le dispositif électronique utilisent le générateur acoustique.
PCT/JP2013/070352 2012-08-10 2013-07-26 Générateur acoustique, dispositif de génération de son et dispositif électronique WO2014024705A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012-179068 2012-08-10
JP2012179068 2012-08-10

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JP2015154298A (ja) * 2014-02-15 2015-08-24 京セラ株式会社 音響発生器，音響発生装置，電子機器

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JP2012110018A (ja) * 2010-06-25 2012-06-07 Kyocera Corp 音響発生器

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Publication number Priority date Publication date Assignee Title
JP2012110018A (ja) * 2010-06-25 2012-06-07 Kyocera Corp 音響発生器

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015154298A (ja) * 2014-02-15 2015-08-24 京セラ株式会社 音響発生器，音響発生装置，電子機器

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