WO2015182197A1 - Générateur acoustique, dispositif de génération accoustique équipé d'un générateur acoustique, et appareil électronique doté d'un générateur acoustique - Google Patents

Générateur acoustique, dispositif de génération accoustique équipé d'un générateur acoustique, et appareil électronique doté d'un générateur acoustique Download PDF

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Publication number
WO2015182197A1
WO2015182197A1 PCT/JP2015/055834 JP2015055834W WO2015182197A1 WO 2015182197 A1 WO2015182197 A1 WO 2015182197A1 JP 2015055834 W JP2015055834 W JP 2015055834W WO 2015182197 A1 WO2015182197 A1 WO 2015182197A1
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Prior art keywords
diaphragm
acoustic
coating layer
generator
filler
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PCT/JP2015/055834
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English (en)
Japanese (ja)
Inventor
宙也 村上
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京セラ株式会社
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Priority to JP2015538783A priority Critical patent/JP5876626B1/ja
Publication of WO2015182197A1 publication Critical patent/WO2015182197A1/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
    • H04R1/20—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
    • 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

Definitions

  • the present invention relates to a sound generator, a sound generation apparatus including the sound generator, and an electronic device.
  • a small-sized, low-current drive acoustic generator using a piezoelectric element is known as an exciter (electroacoustic transducer).
  • an acoustic generator can be used by being incorporated into a small electronic device such as a mobile computing device.
  • such a sound generator includes a diaphragm, a frame that supports the outer periphery of the diaphragm, and a piezoelectric element attached on the diaphragm (for example, see Patent Document 1). reference).
  • the present invention has been made in view of the above circumstances, and an object thereof is to provide a sound generator with improved sound quality, a sound generator equipped with the sound generator, and an electronic apparatus.
  • An acoustic generator includes an exciter, a diaphragm to which the exciter is attached, a frame body provided on an outer periphery of the diaphragm to support the diaphragm, and provided inside the frame body.
  • the coating layer is characterized in that a plurality of fillers made of a material different from the resin are contained in the resin.
  • a sound generator according to the present invention is characterized by including the sound generator according to any one of the above and a housing for housing the sound generator.
  • an electronic device includes the acoustic generator according to any one of the above, an electronic circuit connected to the acoustic generator, and a housing that houses the electronic circuit and the acoustic generator. It is characterized by this.
  • the acoustic generator of the present invention since the propagating vibration is changed by the filler and the resonance is suppressed, the peak dip can be suppressed and the frequency characteristic can be flattened. Therefore, the sound quality is improved.
  • FIG. 2 is a schematic sectional view taken along line AA shown in FIG.
  • FIG. 3 is a schematic cross-sectional view of the piezoelectric element shown in FIGS. 1 and 2.
  • the variation of the filler contained in the acoustic generator of this invention is shown, (a) is spherical shape, (b) is flake shape, (c) is needle shape, (d) has shown random shape. It is the graph which contrasted an example of the frequency characteristic of sound pressure with the Example of this invention, and the comparative example. It is a figure which shows the structure of embodiment of the sound generator of this invention. It is a figure which shows the structure of embodiment of the electronic device of this invention.
  • FIG. 1 (a) is a schematic plan view showing an example of an embodiment of a sound generator of the present invention
  • FIG. 1 (b) is a schematic sectional view taken along line AA shown in FIG. 1 (a).
  • 2A is a schematic plan view showing another example of the embodiment of the sound generator of the present invention
  • FIG. 2B is a schematic bottom view of the sound generator shown in FIG.
  • FIG. 2 (c) is a schematic cross-sectional view taken along line AA shown in FIG. 2 (a).
  • the acoustic generator 1 in the example shown in FIGS. 1 and 2 includes a piezoelectric element 11 as an exciter, a diaphragm 12 to which the piezoelectric element 11 is attached, and a diaphragm 12 provided on the outer periphery of the diaphragm 12. It includes a frame 13 to be supported and a coating layer 14 provided inside the frame 13, and the coating layer 14 includes a plurality of fillers 142 made of a material different from that of the resin 141 in the resin 141.
  • a plate-like piezoelectric element 11 is used as the exciter constituting the acoustic generator 1, for example.
  • the piezoelectric element 11 is attached to the surface of the diaphragm 12, for example, and is excited by exciting the diaphragm 12 by applying a voltage.
  • piezoelectric layers 11a, 11b, 11c, and 11d made of four ceramic layers and three internal electrode layers 11e are alternately arranged.
  • the piezoelectric layer constituting the piezoelectric element 11 is formed of ceramics having piezoelectric characteristics, and as such ceramics, lead zirconate titanate, lithium niobate, lithium tantalate, Bi layered compound Conventionally used piezoelectric ceramics such as lead-free piezoelectric materials such as tungsten bronze structure compounds can be used.
  • the thickness of one layer of the piezoelectric layer is preferably set to 0.01 to 0.1 mm, for example, so as to be driven at a low voltage. 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 11e constituting the piezoelectric element 11 is formed by simultaneous firing with ceramics forming the piezoelectric layers 11a, 11b, 11c, and 11d, and is a first internal electrode connected to the external electrode 11h. And a second internal electrode layer connected to the external electrode 11i.
  • the internal electrode layer 11e is alternately stacked with the piezoelectric layers 11a, 11b, 11c, and 11d, and the first internal electrode layer and the second internal electrode layer are arranged in the stacking order, whereby the surface electrode 11f, A driving voltage is applied to the piezoelectric layers 11a, 11b, 11c, and 11d sandwiched between 11g and the internal electrode layer 11e.
  • the internal electrode layer 11e As a material for forming the internal electrode layer 11e, various metal materials can be used. For example, a conductor mainly composed of silver or silver-palladium suitable for low-temperature firing, or a conductor containing copper, platinum, or the like can be used. However, a ceramic component or a glass component may be contained therein.
  • the internal electrode layer 11e is made of a material containing a metal component composed of silver and palladium and a ceramic component constituting the piezoelectric layers 11a, 11b, 11c, and 11d, the piezoelectric layers 11a, 11b, and 11c are formed. , 11d and the internal electrode layer 11e can be reduced in stress due to the difference in firing shrinkage, so that the piezoelectric element 11 having no stacking failure can be obtained.
  • the piezoelectric element 11 made of a plate-like body in which the main surfaces on the upper surface side and the lower surface side have a polygonal shape such as a rectangular shape or a square shape, or a circular shape or an elliptical shape is preferable.
  • the acoustic generator 1 can be made thin.
  • the piezoelectric element 11 has a bimorph structure. That is, it is preferable that the direction of polarization with respect to the direction of the electric field applied at a certain moment is polarized so as to be reversed between one side and the other side in the thickness direction. In addition to contributing to the reduction in thickness, the diaphragm 12 can be vibrated efficiently with less energy, so that the sound generator 1 having a high sound volume can be obtained.
  • the piezoelectric element 11 is a bimorph type laminated piezoelectric element. However, it may be a unimorph type piezoelectric element (a laminated piezoelectric element that expands and contracts).
  • the diaphragm 12 constituting the acoustic generator 1 can be formed using various materials such as resin and metal.
  • the diaphragm 12 can be made of a resin film such as polyethylene or polyimide having a thickness of 10 to 200 ⁇ m.
  • the piezoelectric element 11 as an exciter is attached to the diaphragm 12. Specifically, the main surface of the piezoelectric element 11 is joined to the main surface of the diaphragm 12 with an adhesive such as an epoxy resin.
  • the diaphragm 12 vibrates together with the piezoelectric element 11 due to the vibration of the piezoelectric element 11.
  • the wiring member 15 is connected to the external electrode, and an electric signal is input to the piezoelectric element 11 via the wiring member 15 (a voltage is applied).
  • the piezoelectric layer on the side bonded to the diaphragm 12 contracts in an in-plane direction perpendicular to the stacking direction, and the piezoelectric layer on the upper surface side of the piezoelectric element 11 is It is deformed so as to extend in an in-plane direction perpendicular to the stacking direction, and is bent toward the diaphragm 12 side. Therefore, by applying an AC signal to the piezoelectric element 11, the piezoelectric element 11 can bend and vibrate, and the diaphragm 12 can be bent.
  • a flexible substrate (FPC) in which a metal foil such as copper or aluminum is sandwiched between resin films, a metal plate, or the like is used. It is advantageous for thinning and low profile.
  • the frame 13 is provided so that the outer peripheral part of the diaphragm 12 may be supported.
  • the frame 13 for example, a frame member whose inner peripheral shape and outer peripheral shape are rectangular can be used.
  • the frame 13 is composed of a frame member 131 provided only on one main surface side of the diaphragm 12, and the sound generator 1 is configured by attaching the outer peripheral portion of the diaphragm 12 to the frame member 131.
  • the frame 13 is composed of one main surface side frame member 131 provided on one main surface side and the other main surface side frame member 132 provided on the other main surface side.
  • the diaphragm 3 is supported by sandwiching the outer periphery of 12.
  • the outer peripheral portion of the diaphragm 12 is sandwiched and fixed between the one main surface side frame member 131 and the other main surface side frame member 132 constituting the frame body 13. In this way, the diaphragm 12 is supported by the frame body 13 while being stretched within the frame of the frame body 13. 1, a portion located on the inner side of the frame 13 in the diaphragm 12, and the one main surface side frame member 131 and the other main surface side frame member 132 that are configured by the frame body 13 in the diaphragm 12 in FIG. 2. The portion not sandwiched between the two can vibrate freely.
  • the thickness and material of the one main surface side frame member 131 and the other main surface side frame member 132 constituting the frame body 13 are not particularly limited.
  • As a material of the one main surface side frame member 131 and the other main surface side frame member 132 constituting the frame body 13 various materials such as glass, metal, and resin can be used. In the case of glass, since there is mechanical strength, deformation of the one main surface side frame member 131 and the other main surface side frame member 132 is small, and sound quality is stabilized.
  • the rigidity is smaller than that of glass, the difference between the resonance peak and the dip is further dispersed, and the frequency characteristics can be flattened. Therefore, the sound quality can be improved by flattening the sound pressure.
  • the rigidity is further smaller than that of metal, the difference between the resonance peak and the dip is dispersed, and the frequency characteristics can be flattened. Therefore, the sound quality can be improved by flattening the sound pressure.
  • the frame 13 has a rectangular shape and the shape of the inner region is a rectangular shape.
  • the aspect ratio is larger than 1, resonance dispersion is shown. And can contribute to the flattening of the peak / 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.
  • the case where there is one piezoelectric element 11 is illustrated, but the number of piezoelectric elements 11 is not limited. Moreover, although the figure shows the case where the piezoelectric element 11 is provided on one main surface of the diaphragm 12, the piezoelectric element 11 may be provided on both surfaces of the diaphragm 12.
  • the frame body 13 (the one main surface side frame member 131 and the other main surface side frame member 132) may be composed of a plurality of frame members in the circumferential direction, and these may be joined to each other.
  • the acoustic generator 1 further includes a coating layer 14 provided inside the frame body 13.
  • the coating layer 14 includes a resin 141 and a plurality of fillers 142 made of a material different from the resin 141, and the resin 141 includes the plurality of fillers 142.
  • the plurality of fillers 142 shown in the figure those indicated by broken lines indicate a state where they are seen through.
  • Examples of the resin 141 constituting the coating layer 14 include acrylic, epoxy, radical polymerization, cationic polymerization, and phenol resins.
  • a resin, a metal, or the like can be used as long as the material has a difference in Young's modulus and density in relation to the resin 141.
  • ceramics such as zirconia and alumina, glass fibers, and the like can be given.
  • the shape of the filler 142 as shown in FIG. 4, for example, (a) spherical shape, (b) flake shape (flat shape), (c) needle shape, (d) random shape, etc. are mentioned. If the filler 142 has a flake shape as shown in FIG. 4B, the adjacent fillers 142 are arranged in parallel with the diaphragm 12 and overlap each other, so that the diaphragm 142 can easily follow the diaphragm 12 and vibrate. The effect is obtained. Thereby, a specific peak dip can be suppressed. Further, if the filler 142 has a needle shape as shown in FIG. 4C, the filler 142 intersects in three dimensions, so that the deformation of the coating layer 14 is reduced.
  • the size of the filler 142 for example, when the filler 142 is spherical, a filler having a diameter of 0.5 to 70 ⁇ m is employed. Moreover, the thing of the same magnitude
  • size is employable also in shapes other than spherical shape.
  • the plurality of fillers 142 are not provided in one place, but are preferably arranged in a scattered manner.
  • the sample to be measured is directly polished with abrasive paper or measured. This can be confirmed by burying the sample in an acrylic resin or the like, polishing the cross section, and observing with a scanning electron microscope (SEM).
  • the filler 142 is contained in such an amount that the filler 142 occupies an area of 1 to 50% when the coating layer 14 is cut in an arbitrary cross section and the cross section is viewed. It is sufficient that the minimum resonance frequency f0 of the sound generator 1 is lowered to flatten the sound pressure.
  • the coating layer 14 includes a plurality of fillers 142 made of a material different from that of the resin 141, the propagating vibration is changed by the fillers 142. Specifically, vibration propagating from the piezoelectric element 11 and the diaphragm 12 is dispersed by the filler 142, and the resonance peak is damped and becomes smaller. Further, spurious vibration due to the reflected wave from the one main surface side frame member 131 is also dispersed by the filler 142, and the resonance peak of the spurious vibration is also damped and becomes small. Thereby, the peak / dip in the frequency-sound pressure characteristic is suppressed, the characteristic can be flattened, and the sound quality can be improved.
  • the heat dissipation effect is enhanced by including the plurality of fillers 142 in the coating layer 14, and the temperature of the diaphragm 12 is increased. It is possible to suppress the decrease in tension and reduce the distortion rate. Therefore, the sound quality is further improved.
  • the coating layer 14 includes a plurality of fillers 142, deformation of the coating layer 14 is reduced. The deformation of the element 11 is also reduced and the durability is improved.
  • the coating layer 14 is not necessarily provided until the surface of the piezoelectric element 11 is covered, but is provided until the surface of the piezoelectric element 11 is covered.
  • An appropriate damping effect can be induced by embedding the piezoelectric element 11 in the coating layer 14.
  • the figure shows a state in which the covering layer 14 is formed to be the same height as the frame body 13, the covering layer 14 may be formed to be higher than the height of the frame body 132.
  • the Young's modulus of the coating layer 14 is lower than the Young's modulus of the piezoelectric element 11 which is an exciter. Since the Young's modulus of the coating layer 14 is lower than the Young's modulus of the piezoelectric element 11, it is difficult to inhibit vibration and the sound pressure in the low range can be increased. Note that the Young's modulus can be compared by preparing a sample piece of the piezoelectric element 11 and a coating layer 14 having the same size as the piezoelectric element 11 and performing a tensile test by pulling the sample pieces in the longitudinal direction. .
  • the coating layer 14 contains phenol resin and zirconia particles as a filler in an area of 0.5% to 10% in an arbitrary cross section, and the piezoelectric element 11 is made of lead zirconate titanate.
  • the Young's modulus of the coating layer 14 can be made lower than the Young's modulus of the piezoelectric element 11.
  • FIG. 5 shows a graph of the difference in frequency characteristics of sound pressure between the acoustic generator provided with the coating layer containing no filler and the acoustic generator provided with the coating layer 14 containing the filler 142.
  • the horizontal axis indicates the frequency
  • the vertical axis indicates the sound pressure.
  • the compared acoustic generator has the same configuration except for the presence or absence of the filler 142, that is, each member and its dimensions and materials.
  • the peaks and dips located in the frequency band of 1 kHz to 2 kHz and the frequency band of 10 kHz to 20 kHz respectively include the coating layer 14 including the filler 142 for the acoustic generator including the coating layer not including the filler.
  • the sound generator is smaller.
  • the sound generator including the coating layer 14 including the filler 142 has a higher sound pressure in the low range of 500 Hz or less than the acoustic generator including the coating layer not including the filler.
  • the peak and dip are smaller and the flatness of the sound pressure is improved and the frequency characteristic of the sound pressure is improved compared to the case where the filler 142 is not included. Is done.
  • the plurality of fillers 142 is in contact with a portion where the Young's modulus changes.
  • the portions where the Young's modulus changes include the boundary between the piezoelectric element 11 and the coating layer 14, the boundary between the frame 13 (one main surface side frame member 131) and the coating layer 14, and the boundary between the diaphragm 12 and the coating layer 14. Etc. By being at these boundaries, vibrations propagated at the boundaries are disturbed and the effect of being distributed is enhanced.
  • the sizes or shapes of the plurality of fillers 142 included in the coating layer 14 are not uniform.
  • the size or shape of the plurality of fillers 142 being non-uniform means that fillers 142 having different sizes or different shapes are included beyond a uniform range.
  • That the size of the plurality of fillers 142 is uniform means that an image including, for example, 100 fillers 142 photographed at an arbitrary magnification with an optical microscope or an electron microscope is prepared, and each filler 142 in the image is prepared. And the filler 142 having the largest particle diameter and the filler 142 having the smallest particle diameter are within the range of plus or minus 10% of the average particle diameter.
  • the particle diameter of the filler 142 draws a plurality of parallel line segments from one direction with respect to the image. At that time, the line segment is drawn so as to be in contact with one end and the other end of one filler 142, and the distance therebetween is defined as the particle diameter. This is similarly performed for each filler 142 in the image.
  • the average particle diameter is obtained by, for example, obtaining the particle diameter of the 100 fillers 142 and calculating the average value. And when the filler 142 which remove
  • the filler 142 when the filler 142 is non-uniform in shape, for example, when the filler 142 is observed with an optical microscope or an electron microscope, the filler 142 includes a plurality of fillers 142 having different shapes such as a spherical shape, a plate shape, and a needle shape, This means that a plurality of fillers 142 that are not the same or similar are included.
  • the size of a plurality of (for example, 500) fillers 142 is obtained from an image or a photograph taken with an optical microscope or an electron microscope at an arbitrary magnification, and a normality test is set to a significance level of 0.05 from this measurement result. If the normality is rejected, it can be determined that the shape is not uniform.
  • the sizes or shapes of the plurality of fillers 142 are not uniform, a difference in elastic modulus and density occurs partially in the planar direction or thickness direction of the coating layer 14, and the resonance can be divided.
  • the difference in the average particle size and particle size distribution of the filler 142 can induce dispersion and scattering of waves propagating in a wider frequency band, so that the frequency characteristics (especially the high frequency characteristics) can be suppressed with less peak dip. ) Can be flattened, and the sound quality is further improved.
  • examples include fillers having a maximum diameter of 70 ⁇ m to fillers having a minimum diameter of 0.5 ⁇ m.
  • examples of the shape of the filler 142 include a spherical shape, a flake shape (flat shape), and a needle shape. This state can be confirmed, for example, by directly polishing the sample to be measured with polishing paper or by burying the sample to be measured in an acrylic resin or the like and performing cross-sectional polishing and observing with a scanning electron microscope (SEM).
  • SEM scanning electron microscope
  • the filling density of the filler 142 included in the coating layer 14 is not uniform when viewed over the entire coating layer 14.
  • the non-uniform filling density of the filler 142 means that the filler 142 has a region where the filling density is higher or lower than other regions.
  • This state can be confirmed, for example, by directly polishing the sample to be measured with polishing paper or by burying the sample to be measured in acrylic resin or the like and performing cross-sectional polishing and observing with a scanning electron microscope (SEM).
  • SEM scanning electron microscope
  • the uniform packing density means that, for example, each of two arbitrary cross sections in the plane direction parallel to the main surface of the diaphragm 12 is divided so as to have substantially the same area (for example, divided into six pieces).
  • the area occupied by the filler 142 in each image is calculated and the average value is calculated by looking at images taken at the same magnification of about 50 to 500 times for any one area (for example, a total of 12 positions), and the average value is calculated. It means that the maximum value and the minimum value of the area occupied by the filler 142 in each divided region are within a range of plus or minus 10% with respect to the value.
  • the above measurement may be performed by preparing cross sections cut in the plane direction at the upper surface side and the lower surface side in the thickness direction of the coating layer 14. Moreover, you may measure the upper surface of the coating layer 14 instead of one cross section.
  • the non-uniform packing density means that the area occupied by the filler 142 in the above measurement is outside the range of plus or minus 10%.
  • This state can be confirmed, for example, by directly polishing the sample to be measured with polishing paper or by burying the sample to be measured in acrylic resin or the like and performing cross-sectional polishing and observing with a scanning electron microscope (SEM).
  • SEM scanning electron microscope
  • the filling density of the filler 142 is not uniform, the density of the filler 142 can be changed in the planar direction or the thickness direction of the coating layer 14. As a result, the vibration is dispersed and the frequency-sound pressure characteristic is flattened, so that the peak dip can be further suppressed to flatten the frequency characteristic (especially the high frequency characteristic), and the sound quality is further improved. .
  • the filling density of the filler 142 for example, two or more kinds of resins 141 having different concentrations of the filler 142 are prepared, and each of them is filled in a dispenser, and then another one of these plural dispensers is simultaneously used.
  • the resin 141 is filled into the dispenser, and the resin 141 is filled into the frame without stirring and mixing, and two or more types of resins 141 with different concentrations of the filler 142 are prepared.
  • the resin 141 is discharged from the plurality of dispensers into the frame at the same time and cured, for example, the resin adjusted to the first concentration is filled to 1/10 of the coating layer, and then adjusted to the second concentration.
  • the sound generator 20 is a sound generation 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.
  • 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 housing 30 can be formed using various materials such as metals such as aluminum and magnesium alloys, resins such as polycarbonate, and wood. By having such a housing 30, for example, the sound pressure in a low frequency band can be increased.
  • Such a sound generator 20 can be used alone as a speaker, and can be suitably incorporated into a portable terminal, a thin-screen TV, a tablet terminal, or the like, as will be described later. Moreover, it can also be incorporated into home appliances that have not been prioritized in terms of sound quality, such as refrigerators, microwave ovens, vacuum cleaners, and washing machines.
  • FIG. 7 is a diagram illustrating a configuration of the electronic device 50 according to the embodiment. In the figure, only components necessary for explanation are shown, and descriptions of general components are omitted.
  • the electronic device 50 of this example includes an acoustic generator 1, an electronic circuit 60 connected to the acoustic generator 1, and a housing 40 that houses the electronic circuit 60 and the acoustic generator 1.
  • the electronic device 50 is assumed to be 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, and includes a housing 40 that accommodates these devices.
  • FIG. 7 shows a state in which each device including the controller 50a is accommodated in one housing 40, 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 sound generator 1 is accommodated in the housing 40 by being joined to the inner wall of the housing 40, for example.
  • the joining member for joining the sound generator 1 is a joining member including a viscoelastic body at least partially.
  • the joining member may be a single member made of only a viscoelastic body or a composite body made up of several members including a viscoelastic body.
  • a double-sided tape in which an adhesive is attached to both surfaces of a base material layer made of a nonwoven fabric or the like can be suitably used.
  • the thickness of the joining member is set to 0.1 mm to 0.6 mm, for example.
  • Examples of the electronic circuit 60 include a circuit for processing image information to be displayed on a display and audio information transmitted by a portable terminal, a communication circuit, and the like. At least one of these circuits may be included, or all the circuits may be included. Further, it may be a circuit having other functions. Furthermore, you may have a some electronic circuit.
  • the electronic circuit 60 and the sound generator 1 are connected by connection wiring.
  • 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.
  • known displays such as a liquid crystal display and an organic EL display can be suitably used.
  • the display may have an input device such as a touch panel.
  • a part of the housing 40 may be a display, or a part of the housing 40 may be a cover of the display and the display may be disposed inside the display 40.
  • 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.
  • FIG. 7 a portable terminal having a communication unit (communication unit) that transmits and receives data via an antenna or the like has been described as the electronic device 50, but the type of the electronic device 50 is not questioned.
  • the present invention 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 of this example since it is configured using the sound generator 1 with improved sound quality, a high sound quality electronic device can be obtained.

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

Abstract

Le problème décrit par la présente invention est de concevoir un générateur acoustique ayant de meilleures qualités sonores, un dispositif de génération acoustique équipé du générateur acoustique, et un appareil électronique doté du générateur acoustique. La solution selon la présente invention porte sur un générateur acoustique (1) caractérisé en ce qu'il comprend : un élément piézoélectrique (11) sous la forme d'un excitateur ; une membrane (12), à laquelle est fixé l'élément piézoélectrique (11) et qui vibre avec l'élément piézoélectrique (11) du fait de la vibration de l'élément piézoélectrique (11) ; un corps de cadre (13), qui est disposé sur une section périphérique extérieure de la membrane (12) et qui supporte la membrane (12) ; et une couche de film de revêtement (14) qui est disposée du côté intérieur du corps de cadre (13). Le générateur acoustique est également caractérisé en ce que la couche de film de revêtement (14) contient plusieurs matières de charge (142) dans une résine (141), lesdites matières de charge étant différentes de la matière de la résine (141).
PCT/JP2015/055834 2014-05-28 2015-02-27 Générateur acoustique, dispositif de génération accoustique équipé d'un générateur acoustique, et appareil électronique doté d'un générateur acoustique WO2015182197A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2015538783A JP5876626B1 (ja) 2014-05-28 2015-02-27 音響発生器およびこれを備えた音響発生装置、電子機器

Applications Claiming Priority (2)

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JP2014110308 2014-05-28
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008167475A (ja) * 2002-02-28 2008-07-17 Furukawa Electric Co Ltd:The 平面スピーカ
JP2012110018A (ja) * 2010-06-25 2012-06-07 Kyocera Corp 音響発生器

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008167475A (ja) * 2002-02-28 2008-07-17 Furukawa Electric Co Ltd:The 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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