WO2014103427A1 - Générateur sonore, appareil de génération sonore et appareil électronique - Google Patents

Générateur sonore, appareil de génération sonore et appareil électronique Download PDF

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Publication number
WO2014103427A1
WO2014103427A1 PCT/JP2013/072877 JP2013072877W WO2014103427A1 WO 2014103427 A1 WO2014103427 A1 WO 2014103427A1 JP 2013072877 W JP2013072877 W JP 2013072877W WO 2014103427 A1 WO2014103427 A1 WO 2014103427A1
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Prior art keywords
diaphragm
tension
vibrating body
sound
exciter
Prior art date
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PCT/JP2013/072877
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English (en)
Japanese (ja)
Inventor
神谷　哲
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京セラ株式会社
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Application filed by 京セラ株式会社 filed Critical 京セラ株式会社
Priority to KR1020137033053A priority Critical patent/KR20140106387A/ko
Publication of WO2014103427A1 publication Critical patent/WO2014103427A1/fr

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/20—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators
    • 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
    • H04R17/005—Piezoelectric transducers; Electrostrictive transducers using a piezoelectric polymer
    • 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
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • H04R7/06—Plane diaphragms comprising a plurality of sections or layers
    • H04R7/10—Plane diaphragms comprising a plurality of sections or layers comprising superposed layers in contact
    • 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
    • H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
    • H04R1/2873—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself for loudspeaker transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R19/00—Electrostatic transducers
    • H04R19/005—Electrostatic transducers using semiconductor materials
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/003—Mems transducers or their use
    • 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.
  • an acoustic generator using a piezoelectric element is known (see, for example, 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 a sound generator can use a thin film such as a resin film for the diaphragm, it can be configured to be thinner and lighter than a general electromagnetic speaker.
  • the thin film when using a thin film for a diaphragm, the thin film is supported in a state in which a uniform tension is applied, for example, by being sandwiched from a thickness direction by a pair of frame members so as to obtain excellent acoustic conversion efficiency. Is required.
  • the conventional acoustic generator described above actively uses the resonance of the diaphragm that is uniformly tensioned, and therefore, in the frequency characteristics of the sound pressure, the peak (the portion where the sound pressure is higher than the surroundings) and the dip There is a problem that high quality sound quality is difficult to obtain due to the fact that the sound pressure is lower than the surrounding area.
  • One aspect of the embodiments has been made in view of the above, and an object thereof is to provide an acoustic generator, an acoustic generator, and an electronic apparatus that can obtain a favorable frequency characteristic of sound pressure.
  • the acoustic generator includes an exciter, a diaphragm, and a support.
  • the exciter vibrates upon receiving an electrical signal.
  • the vibration plate is attached with the exciter, and vibrates with the exciter due to vibration of the exciter.
  • the support is provided on at least a part of the outer peripheral portion of the diaphragm and supports the diaphragm. Further, the diaphragm has different tensions at the central portion of the diaphragm and other portions.
  • a favorable sound pressure frequency characteristic can be obtained.
  • FIG. 1A is a schematic plan view showing a schematic configuration of a basic sound generator.
  • 1B is a cross-sectional view taken along line A-A ′ of FIG. 1A (part 1).
  • FIG. 1C is a cross-sectional view taken along line A-A ′ of FIG. 1A (part 2).
  • FIG. 1D is a schematic plan view showing a central portion of the vibrating body.
  • FIG. 2 is a diagram illustrating an example of frequency characteristics of sound pressure.
  • FIG. 3A is a schematic plan view (part 1) illustrating an example of the configuration of the sound generator according to the embodiment.
  • FIG. 3B is a schematic plan view (part 2) illustrating an example of the configuration of the sound generator according to the embodiment.
  • FIG. 3C is a schematic plan view (part 3) illustrating an example of the configuration of the sound generator according to the embodiment.
  • FIG. 4A is a schematic plan view (part 1) illustrating an example in which tension is applied to a vibrating body from a plurality of directions.
  • FIG. 4B is a schematic plan view (No. 2) illustrating an example when tension is applied to the vibrating body from a plurality of directions.
  • FIG. 4C is a schematic plan view (No. 3) illustrating an example when tension is applied to the vibrating body from a plurality of directions.
  • FIG. 4D is a schematic plan view (part 4) illustrating an example of applying tension to the vibrating body from a plurality of directions.
  • FIG. 4E is a schematic plan view (No.
  • FIG. 5A is a schematic diagram (part 1) illustrating an example of a technique for making the tension of the vibrating body non-uniform.
  • FIG. 5B is a schematic diagram (part 2) illustrating an example of a technique for making the tension of the vibrating body non-uniform.
  • FIG. 6A is a diagram illustrating a configuration of the sound generation device according to the embodiment.
  • FIG. 6B is a diagram illustrating a configuration of the electronic device according to the embodiment.
  • FIGS. 1A to 1D a schematic configuration of a basic sound generator 1 'will be described with reference to FIGS. 1A to 1D.
  • 1A is a schematic plan view showing a schematic configuration of an acoustic generator 1 ′
  • FIG. 1B is a cross-sectional view taken along the line AA ′ of FIG. 1A
  • FIG. 1C is a diagram of FIG. 1A.
  • AA ′ line cross-sectional view (No. 2) and FIG. 1D are schematic plan views showing the central part of the vibrator.
  • FIGS. 1A to 1D show a three-dimensional orthogonal coordinate system including a Z-axis in which the vertical upward direction is a positive direction and the vertical downward direction is a negative direction.
  • Such an orthogonal coordinate system may also be shown in other drawings used in the following description.
  • FIG. 1A the resin layer 7 (described later) is not shown.
  • FIG. 1B and FIG. 1C show the sound generator 1 ′ greatly exaggerated in the thickness direction (Z-axis direction).
  • the sound generator 1 includes a frame 2, a diaphragm 3, a piezoelectric element 5 as an exciter, and lead wires 6a and 6b.
  • the frame body 2 functions as a support body that supports the diaphragm 3 at the outer peripheral portion (peripheral portion) of the diaphragm 3.
  • the diaphragm 3 has a plate-like or film-like shape, and its peripheral edge is fixed to the frame 2 and is supported substantially flat in a state where tension is applied within the frame of the frame 2.
  • the frame 2 shown in FIG. 1B is composed of one frame member.
  • the frame body 2 is configured by two frame members 2 a and 2 b having a rectangular frame shape and the same shape, and sandwiches the outer peripheral portion (peripheral portion) of the diaphragm 3. It functions as a support for supporting the diaphragm 3.
  • the diaphragm 3 has a plate-like or film-like shape, and its outer peripheral portion is sandwiched and fixed by the frame body 2 and is supported substantially flat in a state where tension is applied in the frame of the frame body 2. Is done.
  • the tension of the diaphragm 3 can be stabilized by sandwiching the diaphragm 3 between the two frame members 2a and 2b, the frequency characteristics of the sound generator 1 ′ are durable and do not fluctuate for a long time. Even better because it can be.
  • the vibrating body 3 a is a portion that has a substantially rectangular shape within the frame of the frame body 2.
  • the diaphragm 3 can be formed using various materials such as resin and metal.
  • the diaphragm 3 can be made of a resin film such as polyethylene or polyimide having a thickness of 10 to 200 ⁇ m.
  • the thickness and material of the frame member constituting the frame body 2 are not particularly limited, and can be formed using various materials such as metal and resin.
  • a stainless steel member having a thickness of 100 to 5000 ⁇ m can be suitably used as the frame member constituting the frame body 2 because of its excellent mechanical strength and corrosion resistance.
  • FIG. 1A shows the frame 2 in which the shape of the inner region is substantially rectangular, but it may be a polygon such as a parallelogram, trapezoid, or regular n-gon. In the present embodiment, as shown in FIG.
  • the piezoelectric element 5 is an exciter which is provided by being attached to the surface of the vibrating body 3a, etc., and excites the vibrating body 3a by receiving a voltage to vibrate.
  • the piezoelectric element 5 includes, for example, a laminate in which piezoelectric layers 5a, 5b, 5c, and 5d made of ceramics and three internal electrode layers 5e are alternately laminated. Body, surface electrode layers 5f and 5g formed on the upper and lower surfaces of the laminate, and external electrodes 5h and 5j formed on the side surfaces where the internal electrode layer 5e is exposed.
  • the lead wires 6a and 6b are connected to the external electrodes 5h and 5j.
  • the lead wires 6a and 6b are conducting wires for inputting an electric signal from the outside.
  • the piezoelectric element 5 has a plate shape, and the main surface on the upper surface side and the lower surface side has a polygonal shape such as a rectangular shape or a square shape.
  • the piezoelectric layers 5a, 5b, 5c, and 5d are polarized as shown by arrows in FIG. 1B or 1C. In other words, polarization is performed such that the direction of polarization with respect to the direction of the electric field applied at a certain moment is reversed between one side and the other side in the thickness direction (Z-axis direction in the figure).
  • the piezoelectric layers 5c and 5d on the side bonded to the vibrating body 3a contract and the upper surface of the piezoelectric element 5 is compressed.
  • the piezoelectric layers 5a and 5b on the side are deformed so as to extend. Therefore, by applying an AC signal to the piezoelectric element 5, the piezoelectric element 5 can bend and vibrate, and the vibrating body 3a can be bent.
  • the main surface of the piezoelectric element 5 is joined to the main surface of the vibrating body 3a by an adhesive such as an epoxy resin.
  • the materials constituting the piezoelectric layers 5a, 5b, 5c and 5d have conventionally been lead-free piezoelectric materials such as lead zirconate titanate, Bi layered compounds and tungsten bronze structure compounds.
  • the used piezoelectric ceramics can be used.
  • various metal materials can be used as the material of the internal electrode layer 5e.
  • the piezoelectric layers 5a, 5b, 5c, and 5d are contained, the piezoelectric layers 5a, 5b, 5c, and 5d and the internal electrode layer 5e Since the stress due to the difference in thermal expansion can be reduced, the piezoelectric element 5 free from stacking faults can be obtained.
  • the sound generator 1 ′ further includes a resin layer 7 provided on the vibrating body 3a between the frame body 2 and the piezoelectric element 5 (exciter). .
  • a resin layer 7 is further provided in the frame of the frame 2 so as to cover the surfaces of the piezoelectric element 5 and the vibrating body 3 a and integrated with the vibrating body 3 a and the piezoelectric element 5.
  • the resin layer 7 is preferably formed using, for example, an acrylic resin so that the Young's modulus is about 1 MPa to 1 GPa.
  • the moderate damper effect can be induced by embedding the piezoelectric element 5 in the resin layer 7, the resonance phenomenon can be suppressed, and the peak or dip in the frequency characteristic of the sound pressure can be suppressed to be small.
  • 1B or 1C shows a state in which the resin layer 7 is formed so as to have the same height as the frame 2, but the inside of the frame 2 is embedded so that the piezoelectric element 5 is embedded.
  • the resin layer 7 may be formed to be higher than the height of the frame 2.
  • the vibrating body 3a, the piezoelectric element 5 and the resin layer 7 are integrated to form a so-called composite vibrating body that vibrates integrally.
  • the bimorph multilayer piezoelectric element is taken as an example of the piezoelectric element 5.
  • the piezoelectric element 5 is not limited to this.
  • the expanding and contracting piezoelectric element 5 is attached to the vibrating body 3a. It may be a unimorph type.
  • FIG. 2 is a diagram illustrating an example of frequency characteristics of sound pressure.
  • a peak concentrates on a specific frequency due to resonance of the vibrating body 3a, and thus the vibrating body 3a degenerates.
  • steep peaks and dips are likely to be scattered over the entire frequency domain.
  • the height of the peak P is lowered (see the arrow 201 in the figure), the peak width is widened (see the arrow 202 in the figure), and the peak P or dip (not shown) is reduced. It is effective to take measures to make it smaller.
  • the tension applied to the diaphragm 3 (vibrating body 3a) is made different between the central portion of the diaphragm 3 (vibrating body 3a) and other portions. That is, by making the tension applied to the vibration plate 3 (vibrating body 3a) asymmetric, the symmetry of the vibrating body 3a and thus the entire composite vibrating body is reduced.
  • the resonance frequency is partially unbalanced so that the degeneration of the resonance mode is solved and dispersed, so that the height of the peak P is lowered and the peak width is widened.
  • the tension of the central portion of the diaphragm 3 (vibrating body 3a) is set to 0.2 to 100 gf / mm, for example, and the tension of other portions is set to 0.24 to 400 gf / mm, for example. For example, it is effective to be 1.2 to 4 times.
  • the “central portion” when the tension is different between the central portion of the diaphragm 3 (vibrating body 3a) and other portions is at least a part of the region overlapping the piezoelectric element 5 in a plan view shown in FIG. 1D. It is.
  • the “central part” of the vibrating body 3a means the position of the center of gravity when viewed in plan.
  • the tension When the tension is reduced along the axis L or the axis S as shown in FIG. 3A and FIG. 3B, the tension becomes the highest at other portions except the center. In other words, the tension is the smallest at the central portion of the diaphragm 3 (vibrating body 3a), and the portion having the largest tension is in other portions except the central portion. That is, since the tension applied to the vibrating body 3a can be asymmetrical, the resonance frequency can be partially unbalanced and the frequency characteristics of the sound pressure can be flattened.
  • a tension meter may be pressed against the measurement site and measured. That is, the tension meter may be pressed against the central portion of the diaphragm 3 (vibrating body 3a) and other portions to measure the tension, and the tension may be different between the central portion and the other portions.
  • a tension meter When measuring the tension of the vibrating body 3a, for example, a tension meter is pressed against the surface of the vibrating body 3a where the piezoelectric element 5 is not provided, and the value indicated by the tension meter is measured to determine whether the values are different. Check it.
  • the resin layer 7 may be dissolved with an organic solvent or the like, and the piezoelectric element 5 may be peeled off.
  • FIGS. 3A and 3B are schematic plan views (No. 1) and (No. 2) showing an example of the configuration of the acoustic generator 1 according to the embodiment.
  • the resin layer 7 may be omitted for the sake of convenience of explanation as in FIG. 1A.
  • the magnitude of the tension applied to the vibrating body 3a is distinguished by a thick white arrow and a thin black arrow, and the thick white arrow has a relatively larger tension than the thin black arrow. (Refer to FIG. 3A and FIG. 3B).
  • the direction of these arrows represents the direction in which tension is applied.
  • axis L the central axis of the vibrating body 3a along the longitudinal direction
  • axis S the central axis of the vibrating body 3a along the short direction
  • the vibrator 3 a of the sound generator 1 has different tensions at the central portion of the vibrator 3 a and other parts.
  • the tension may be applied from at least one direction (here, the longitudinal direction) as shown in FIG. 3A.
  • the vibrating body 3a when the vibrating body 3a is formed by applying tension only from one direction, it takes less time than the case of applying tension from a plurality of directions, and an effect of contributing to mass production can be obtained.
  • the tension of the vibrating body 3a may be applied so as to be non-uniform in the same direction.
  • the tension applied to the portion on the “axis L” that is the central axis of the vibrating body 3a along the longitudinal direction and the tension applied to the portion on the axis parallel to the axis L and away from the axis L are non-uniform. It may be.
  • FIG. 3A shows a case where the tension is small along the axis L.
  • the tension of the region where the region where the piezoelectric element 5 exists is extended in the longitudinal direction of the vibrating body 3a (that is, the hatched region in the drawing) is smaller than at least the other portions.
  • the one direction is the longitudinal direction has been described, but as shown in FIG. 3B, the one direction may be the short direction.
  • the tension in the region where the region where the piezoelectric element 5 exists is extended in the short direction of the vibrating body 3a (that is, see the shaded region in the drawing) is smaller than at least other portions.
  • the tension applied to the vibrating body 3a can be made asymmetrical, so that the resonance frequency is partially unbalanced, the sound pressure peak P at the resonance point is varied, and the frequency characteristics of the sound pressure. Can be flattened. That is, it is possible to obtain a favorable frequency characteristic of sound pressure.
  • FIG. 3A demonstrated the example with the area
  • the tension on the vibrating body 3a may be applied not only in one direction but also in other directions intersecting with the one direction.
  • it may be applied from two orthogonal directions, the longitudinal direction shown in FIGS. 3A and 3C and the short direction shown in FIG. 3B.
  • the tension is not uniform, at least the rigidity of the vibrating body 3a can be maintained.
  • FIGS. 4A to 4E are schematic plan views (No. 1) to (No. 5) showing an example in which tension is applied to the vibrating body 3a from a plurality of directions.
  • the plural directions are two directions orthogonal to each other in the longitudinal direction and the short direction.
  • a tension may be applied uniformly in the short direction and non-uniform in the longitudinal direction.
  • the tension applied to the vibrating body 3a in addition to making the tension applied to the vibrating body 3a asymmetrical, it is possible to obtain the sound generator 1 that can easily produce a low frequency range by relatively increasing the tension in the short direction.
  • the tension may be uniformly applied in the longitudinal direction and non-uniform in the short direction.
  • the tension applied to the vibrating body 3a can be asymmetrical, and the tension in the longitudinal direction can be made relatively large to prevent the piezoelectric element 5 from being violated by vibration and to suppress distortion of the sound. It is possible to obtain the effect of being able to.
  • the tension may be nonuniform in both the longitudinal direction and the short direction, and further, for example, a portion having a small tension may be shifted from the center of the vibrating body 3a, in other words, may be decentered.
  • the resonance frequency can be made partially less uniform, and the frequency characteristics of the sound pressure can be effectively flattened.
  • the central portion of the vibrating body 3a has a relatively smaller tension than other portions.
  • the tension may be relatively greater than the part.
  • the resonance frequency can be partially unbalanced, and the frequency characteristics of the sound pressure can be flattened.
  • FIGS. 5A and 5B are schematic diagrams (No. 1) and (No. 2) showing an example of a technique for making the tension of the vibrating body 3a non-uniform.
  • FIG. 5B illustrates an acoustic generator 1AA according to a modification in which the vibrating body 3a is supported at both ends in the longitudinal direction by a support body 2 'instead of the frame body 2.
  • the piezoelectric element 5 is attached to the vibrating body 3a with no tension applied to the vibrating body 3a. This can be realized by applying tension to the vibrating body 3a later.
  • the vibrating body 3a When the vibrating body 3a is supported by the support 2 'from both ends in the longitudinal direction as in the acoustic generator 1AA shown in FIG. 5B, the vibrating body is formed by forming a notch c in the support 2'.
  • the uniformity of 3a can be changed, that is, non-uniform.
  • the support 2 ′ supports the vibrating body 3a from both ends in the longitudinal direction.
  • the present invention is not limited to this.
  • the support 2 ′ supports only at both ends in the short direction of the vibrating body 3a. It is good as well. That is, the support body including the frame body 2 may be provided on at least a part of the outer peripheral portion of the vibrating body 3a.
  • FIG. 6A is a diagram illustrating a configuration of the sound generation device 20 according to the embodiment
  • FIG. 6B is a diagram illustrating a configuration of the electronic device 50 according to the embodiment.
  • FIG. 6A is a diagram illustrating a configuration of the sound generation device 20 according to the embodiment
  • FIG. 6B is a diagram illustrating a configuration of the electronic device 50 according to the embodiment.
  • only the component required for description is shown and description about a general component is abbreviate
  • the sound generator 20 is a sounding device such as a so-called speaker, and includes, for example, a sound generator 1 and a housing 30 that houses the sound generator 1 as shown in FIG. 6A.
  • the housing 30 resonates the sound generated by the sound generator 1 and radiates the sound to the outside through an opening (not shown) formed in the housing 30.
  • the sound pressure in a low frequency band can be increased.
  • the sound generator 1 can be mounted on various electronic devices 50.
  • the electronic device 50 is a mobile terminal device such as a mobile phone or a tablet terminal.
  • the electronic device 50 includes an electronic circuit 60.
  • 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 1 and has a function of outputting an audio signal to the sound generator 1.
  • the sound generator 1 generates sound based on the sound signal input from the electronic circuit 60.
  • the electronic device 50 includes a display unit 50e, an antenna 50f, and the sound generator 1. Further, the electronic device 50 includes a housing 40 that accommodates these devices.
  • each device including the controller 50a is accommodated in one housing 40, but the accommodation form of each device is not limited. In the present embodiment, it is sufficient that at least the electronic circuit 60 and the sound generator 1 are accommodated in one housing 40.
  • 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 sound generator 1 operates as a sound output device in the electronic device 50.
  • the sound generator 1 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 TVs and car audio devices can of course be used for products having a function of emitting sound such as "speak", for example, various products such as vacuum cleaners, washing machines, refrigerators, microwave ovens, etc. .
  • the sound generator includes an exciter (piezoelectric element), a vibrating body, and a support.
  • the exciter vibrates when an electric signal is input thereto.
  • the vibrator is attached with the exciter, and vibrates with the exciter due to the vibration of the exciter.
  • the support is provided on at least a part of the outer peripheral portion of the vibrating body, and supports the vibrating body in a substantially flat shape. In addition, different tensions are applied to the vibrating body at the central portion of the vibrating body and other portions.
  • the sound generator according to the embodiment it is possible to obtain a favorable frequency characteristic of sound pressure.
  • the piezoelectric element is provided on one main surface of the vibrating body as an example.
  • the present invention is not limited to this, and the piezoelectric element is provided on both surfaces of the vibrating body. It may be provided.
  • the exciter is a piezoelectric element
  • the exciter is not limited to the piezoelectric element, and has a function of vibrating when an electric signal is input. What is necessary is just to have.
  • an electrodynamic exciter for vibrating a speaker
  • an electrostatic exciter for vibrating a speaker
  • an electromagnetic exciter well known as an exciter for vibrating a speaker
  • the electrodynamic exciter is such that an electric current is passed through a coil disposed between the magnetic poles of a permanent magnet to vibrate the coil.
  • the electrostatic exciter is composed of two metals facing each other. A bias and an electric signal are passed through the plate to vibrate the metal plate, and an electromagnetic exciter is an electric signal that is passed through the coil to vibrate a thin iron plate.

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

Abstract

Le problème décrit par la présente invention est d'obtenir d'excellentes caractéristiques de fréquence de pression acoustique. La solution, selon un mode de réalisation de la présente invention, porte sur un générateur sonore qui est pourvu d'un excitateur, d'une membrane et d'un corps de support. L'excitateur vibre lorsque des signaux électriques y sont introduits. La membrane est pourvue de l'excitateur fixé à celle-ci et vibre avec l'excitateur grâce aux vibrations générées par ce dernier. Le corps de support est ménagé sur au moins une partie d'une portion circonférentielle externe de la membrane et soutient celle-ci. Différentes tensions sont appliquées respectivement sur une portion centrale et sur d'autres portions de la membrane.
PCT/JP2013/072877 2012-12-26 2013-08-27 Générateur sonore, appareil de génération sonore et appareil électronique WO2014103427A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020137033053A KR20140106387A (ko) 2012-12-26 2013-08-27 음향 발생기, 음향 발생 장치 및 전자 기기

Applications Claiming Priority (2)

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JP2015088909A (ja) * 2013-10-30 2015-05-07 京セラ株式会社 電子機器

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JP2001119790A (ja) * 1999-10-22 2001-04-27 Nec Viewtechnology Ltd 振動膜及び平面スピーカ
JP2012110018A (ja) * 2010-06-25 2012-06-07 Kyocera Corp 音響発生器

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JP2001119790A (ja) * 1999-10-22 2001-04-27 Nec Viewtechnology Ltd 振動膜及び平面スピーカ
JP2012110018A (ja) * 2010-06-25 2012-06-07 Kyocera Corp 音響発生器

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015088909A (ja) * 2013-10-30 2015-05-07 京セラ株式会社 電子機器

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