WO2015105197A1 - 音響発生器,音響発生装置,電子機器 - Google Patents
音響発生器,音響発生装置,電子機器 Download PDFInfo
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- WO2015105197A1 WO2015105197A1 PCT/JP2015/050591 JP2015050591W WO2015105197A1 WO 2015105197 A1 WO2015105197 A1 WO 2015105197A1 JP 2015050591 W JP2015050591 W JP 2015050591W WO 2015105197 A1 WO2015105197 A1 WO 2015105197A1
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- exciter
- damping material
- sound
- sound generator
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Images
Classifications
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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
- H04R17/005—Piezoelectric transducers; Electrostrictive transducers using a piezoelectric polymer
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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
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/26—Damping by means acting directly on free portion of diaphragm or cone
-
- 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
- H04R7/16—Mounting or tensioning of diaphragms or cones
- H04R7/18—Mounting or tensioning of diaphragms or cones at the periphery
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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
- 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 an acoustic generator, an acoustic generator, and an electronic device.
- the conventional speaker described above has a problem that the sound distortion generated is large and the sound quality is poor.
- the present invention has been devised in view of such problems in the prior art, and the purpose thereof is an acoustic generator capable of generating high-quality sound with low distortion, and using the same,
- An object is to provide a sound generator and an electronic device.
- the acoustic generator according to the present invention includes a vibrating body having two surfaces that are spaced apart in the first direction, a first exciter and a second exciter provided on the vibrating body, and the first direction.
- a first portion that is a portion overlapping the first exciter when viewed from above, a first damping material provided on the vibrating body, and the second portion when viewed from the first direction.
- a second damping material provided on the vibrating body, the first excitation when viewed from the first direction.
- a portion of the contour of the exciter that does not face the second exciter is a first segment, and a portion of the contour of the second exciter that does not face the first exciter is a second segment.
- the first damping material is at least one of the first segments. The are arranged astride the second damping member is arranged so as to straddle at least a portion of the second segment.
- the sound generator of the present invention includes the sound generator and an enclosure attached to the sound generator.
- the electronic device of the present invention includes the sound generator and an electronic circuit connected to the sound generator.
- the sound generator, sound generator, and electronic device of the present invention can generate high-quality sound with low distortion.
- FIG. 2 is a cross-sectional view taken along line A-A ′ of FIG. 1. It is the top view seen from the + z direction which shows typically the sound generator of a 2nd embodiment of the present invention. It is sectional drawing which shows typically the acoustic generator of 3rd Embodiment of this invention. It is a perspective view which shows typically the sound generator of 4th Embodiment of this invention. It is a block diagram which shows the structure of the electronic device of 5th Embodiment of this invention.
- FIG. 1 is a plan view schematically showing the sound generator according to the first embodiment of the present invention, as viewed from the + z direction (first direction).
- FIG. 2 is a plan view schematically showing the sound generator of the first embodiment of the present invention as seen from the ⁇ z direction.
- 3 is a cross-sectional view taken along line AA ′ in FIG. FIG. 2 shows a state where the resin layer 23 is seen through.
- the acoustic generator of this embodiment includes an exciter 11 and an exciter 12, a film 21, a resin layer 23, a frame 25a and a frame 25b, a damping material 31 and a damping material. 32.
- the frame 25a and the frame 25b each have a rectangular frame shape.
- a stainless steel frame having a thickness of 100 to 1000 ⁇ m can be suitably used for the frame 25a and the frame 25b, but the material and thickness are not particularly limited, and are less likely to be deformed than the film 21 and the resin layer 23. Anything is fine.
- the frame 25a and the frame 25b can be formed using hard resin, plastic, engineering plastic, glass, single crystal, ceramics, or the like.
- the film 21 has a film-like (film-like) shape, and can be formed using, for example, a resin such as PET (polyethylene terephthalate) or polyimide.
- the thickness of the film 21 is, for example, 10 to 200 ⁇ m.
- the film 21 is stretched in the plane direction (+ x direction and + y direction), and the peripheral portions of the upper and lower main surfaces (the surface in the + z direction and the surface in the ⁇ z direction) are framed by the frame 25a and the frame 25b. It is sandwiched and fixed, and is supported by the frame 25a and the frame 25b so as to vibrate.
- the vibrating body 21a which can vibrate freely is comprised by the part which is located inside the frame 25a and the frame 25b in the film 21, and is not pinched
- the shape of the frame 25a and the frame 25b is not limited to a rectangular shape, and may be a circle or a rhombus.
- the film 21 may be adhered to the surface of the frame 25a in the + z direction.
- the frame 25a is not provided, for example, the ⁇ 25 direction of the frame 25b is used. What is necessary is just to adhere
- the vibrating body 21a should just be a film form (film
- the exciter 11 and the exciter 12 are attached to the surface of the vibrating body 21a on the ⁇ z direction side.
- the exciter 11 and the exciter 12 are piezoelectric elements having a plate shape in which the upper and lower main surfaces (the surface in the + z direction and the surface in the ⁇ z direction) are rectangular.
- the exciter 11 and the exciter 12 include a laminate formed by alternately laminating piezoelectric layers made of piezoelectric ceramics and internal electrode layers, and upper and lower surfaces (in the + z direction) of the laminate.
- the exciter 11 and the exciter 12 are bimorph piezoelectric elements, and when an electric signal is input, at any moment, one side and the other side in the thickness direction (the + z direction side and the ⁇ z direction side) ) And the expansion and contraction are reversed. Therefore, the exciter 11 and the exciter 12 bend and vibrate in the + z direction when an electric signal is input, and vibrate the vibrating body 21a by vibrating itself. Then, sound is generated when the vibrating body 21a vibrates.
- a monomorph type vibration element configured by bonding a piezoelectric element that receives an electric signal to stretch and vibrate and a metal plate may be used.
- the main surface on the film 21 side of the exciter 11 and the exciter 12 and the film 21 are bonded by, for example, a known adhesive such as an epoxy resin, a silicone resin, a polyester resin, or a double-sided tape. Yes.
- piezoelectric layers of the exciter 11 and the exciter 12 lead-free piezoelectric materials such as lead zirconate (PZ), lead zirconate titanate (PZT), Bi layered compounds, tungsten bronze structure compounds, and the like are conventionally used. Piezoelectric ceramics that have been used can be used. The thickness of one piezoelectric layer is preferably about 10 to 100 ⁇ m, for example.
- the internal electrode layers of the exciter 11 and the exciter 12 various known metal materials can be used.
- an internal electrode layer containing a metal component made of silver and palladium and a material component constituting the piezoelectric layer can be used, but it may be formed using other materials.
- the surface electrode layers and the terminal electrodes of the exciter 11 and the exciter 12 can be formed using various known metal materials. For example, it can be formed using a material containing a metal component made of silver and a glass component, but may be formed using other materials.
- the exciter 11 When viewed from the + z direction, the exciter 11 has a rectangular outline. Specifically, the outline of the exciter 11 is composed of two long sides 11d and 11f and two short sides 11e and 11g. Of the four sides constituting the contour of the exciter 11, the two sides 11 d and 11 e do not face the exciter 12, and the two sides 11 f and 11 g face the exciter 12. That is, when viewed from the + z direction, the segment 11h (first segment) composed of the two sides 11d and 11e in the outline of the exciter 11 does not face the exciter 12, and the two sides 11f. , 11g, a segment 11k (third segment) faces the exciter 12.
- the exciter 12 when viewed from the + z direction, has a rectangular outline. Specifically, the contour of the exciter 12 is composed of two long sides 12d and 12f and two short sides 12e and 12g. Of the four sides constituting the rectangular outline of the exciter 12, the two sides 12d and 12e do not face the exciter 11, and the two sides 12f and 12g face the exciter 11. Yes. That is, when viewed from the + z direction, the segment 12h (second segment) composed of the two sides 12d and 12e in the outline of the exciter 12 does not face the exciter 11, and the two sides 12f. , 12g, the segment 12k (fourth segment) faces the exciter 11.
- the portion of the exciter 11 facing the exciter 12 means a portion of the exciter 11 that is located on the side of the exciter 12 and is visible from the exciter 12.
- the portion facing the surface means a portion of the exciter 12 that is located on the exciter 11 side and is visible from the exciter 11.
- the resin layer 23 is provided over the entire inside of the frame 25a so that the exciter 11 and the exciter 12 are embedded.
- the resin layer 23 can be formed using various known materials. For example, a resin such as an acrylic resin or a silicone resin, rubber, or the like can be used.
- the thickness of the resin layer 23 is desirably a thickness that completely covers the exciter 11 and the exciter 12, but may be formed so as to cover at least a part of the film 21.
- the resin layer 23 has an effect of improving the sound quality of the sound generated from the sound generator, but is not essential and may be omitted depending on circumstances.
- the damping material 31 and the damping material 32 are attached to the surface of the vibrating body 21a on the + z direction side. Each of the damping material 31 and the damping material 32 is formed so as to overlap a part of the vibrating body 21a when viewed from the + z direction.
- the damping material 31 has a portion 31a that overlaps the exciter 11 when viewed from the + z direction, and the damping material 32 is a portion that overlaps the exciter 12 when viewed from the + z direction.
- a portion 32a is provided. The area of the portion 31a and the area of the portion 32a are different.
- the damping material 31 and the damping material 32 may have any mechanical loss, but are desirably members having a high mechanical loss factor, in other words, a low mechanical quality factor (so-called mechanical Q).
- a damping material 31 and a damping material 32 can be formed using various elastic bodies, for example, but since it is desirable that the material is soft and easily deformed, a rubber material such as urethane rubber or a soft material such as silicone resin is used. It can be suitably formed using a resin material or the like. In particular, a porous rubber material such as urethane foam can be suitably used.
- the portion to which the damping material 31 and the damping material 32 are attached receives vibration loss due to the damping material 31 and the damping material 32, the amplitude of the portion to which the damping material 31 and the damping material 32 are attached can be reduced. it can.
- the sound generator of this embodiment includes the vibrating body 21a, the exciter 11 and the exciter 12, and the damping material 31 and the damping material 32.
- the vibrating body 21a has two surfaces positioned with a gap in the + z direction.
- the exciter 11 and the exciter 12 are provided in the vibrating body 21a.
- the damping material 31 has a portion 31a which is a portion overlapping the exciter 11 when viewed from the + z direction, and is provided on the vibrating body 21a.
- the damping material 32 has a portion 32a which is a portion overlapping the exciter 12 when viewed from the + z direction, and is provided on the vibrating body 21a.
- the damping material 31 is disposed so as to straddle at least a part of the segment 11h, and the damping material 32 is disposed so as to straddle at least a part of the segment 12h.
- the damping material 31 is disposed over both the part where the exciter 11 is present and the part where the exciter 11 is not present, exceeding at least a part of the segment 11h.
- the damping material 32 is disposed over both the portion where the exciter 12 is present and the portion where the exciter 12 is not present, beyond at least a part of the segment 12h. With such a configuration, it is possible to generate high-quality sound with low distortion.
- the reason why this effect can be obtained can be estimated as follows.
- the exciter 11 and the exciter 12 are attached to the vibrating body 21a, and the exciter 11 and the exciter 12 vibrate by electric signals. Therefore, it becomes possible to reduce the symmetry in vibration of the vibrating body 21a, and it is possible to reduce a sudden change in sound pressure at a specific frequency due to resonance.
- the damping material 31 and the damping material 32 are attached to the vibrating body 21a.
- the damping material 31 has a portion 31a that overlaps the exciter 11 when viewed from the + z direction, and the damping material 32 is a portion that overlaps the exciter 12 when viewed from the + z direction.
- a portion 32a is provided.
- the damping material 31 is arrange
- the contour of the exciter 12 is arranged so as to straddle at least a part of the segment 12h which is a portion not facing the exciter 11.
- the vicinity of the segment 11h in the contour of the exciter 11 and the vicinity of the segment 12h in the contour of the exciter 12 have a relatively small amplitude in the fundamental resonance mode when the exciter 11 and the exciter 12 vibrate in synchronism.
- the exciter 11 has a portion 11a that does not overlap the damping material 31 when viewed from the + z direction, and the exciter 12 is viewed from the + z direction. And a portion 12a that does not overlap with the damping material 32. Then, when viewed from the + z direction, a portion facing the exciter 12 in the contour of the exciter 11 is a segment 11k, and a portion facing the exciter 11 in the contour of the exciter 12 is a segment 12k. When viewed, the portion 11a is in contact with at least a portion of the segment 11k, and the portion 12a is in contact with at least a portion of the segment 12k.
- the segment 11k when viewed from the + z direction, at least a part of the segment 11k is included in the outline of the part 11a, and at least a part of the segment 12k is included in the outline of the part 12a.
- the vicinity of the segment 11k in the contour of the exciter 11 and the vicinity of the segment 12k in the contour of the exciter 12 are portions where the amplitude in the fundamental resonance mode is relatively large when the exciter 11 and the exciter 12 vibrate in synchronization. . Therefore, by providing the damping material while avoiding this portion, it is possible to reduce the decrease in sound pressure, particularly on the low frequency side, of the sound generated from the sound generator. However, this is not essential and may not be necessary in some cases.
- the area of the portion 31a and the area of the portion 32a are different. Therefore, since the symmetry in the vibration of the vibrating body 21a can be reduced, a sudden change in sound pressure at a specific frequency can be reduced, thereby reducing distortion. However, this is not essential and may not be necessary in some cases.
- the shape of the portion 31a is different from the shape of the portion 32a. Therefore, since the symmetry in the vibration of the vibrating body 21a can be further reduced, a sudden change in sound pressure at a specific frequency can be reduced, thereby reducing distortion. However, this is not essential and may not be necessary in some cases.
- the area of the part 11a and the area of the part 12a are different. Therefore, since the symmetry in the vibration of the vibrating body 21a can be further reduced, a sudden change in sound pressure at a specific frequency can be reduced, thereby reducing distortion. However, this is not essential and may not be necessary in some cases.
- the shape of the portion 11a is different from the shape of the portion 12a. Therefore, since the symmetry in the vibration of the vibrating body 21a can be further reduced, a sudden change in sound pressure at a specific frequency can be reduced, thereby reducing distortion. However, this is not essential and may not be necessary in some cases.
- the exciter 11 and the exciter 12 have all the symmetry axes (line symmetry symmetry axis and rotational symmetry of the figure drawn by the outline of the vibrating body 21a when viewed from the + z direction. It is desirable to arrange them asymmetrically with respect to the center. Thereby, the symmetry in the vibration of the vibrating body 21a can be further reduced. However, this is not essential and may not be.
- the acoustic generator of the present embodiment can be manufactured as follows, for example. First, a binder, a dispersant, a plasticizer, and a solvent are added to the powder of the piezoelectric material and stirred to prepare a slurry. As the piezoelectric material, any of lead-based and non-lead-based materials can be used. Next, the obtained slurry is formed into a sheet shape to produce a green sheet. A conductor paste is printed on the green sheet to form a conductor pattern to be an internal electrode, and the green sheet on which the conductor pattern is formed is laminated to produce a laminated molded body.
- the laminated body can be obtained by degreasing, firing, and cutting into a predetermined dimension. If necessary, the outer periphery of the laminate is processed.
- a conductor paste is printed on the main surface in the stacking direction of the multilayer body to form a conductor pattern to be a surface electrode layer, and the conductor paste is printed on both end surfaces in the longitudinal direction of the multilayer body to form a pair of terminal electrodes A conductor pattern is formed.
- the structure used as the exciter 11 and the exciter 12 can be obtained by baking an electrode at predetermined temperature.
- the periphery of the film 21 in a tensioned state is fixed by being sandwiched between the frame 25a and the frame 25b coated with an adhesive, and the adhesive is cured and joined.
- the exciter 11 and the exciter 12 are bonded to the film 21 with an adhesive on the surface of the vibrating body 21 a on the ⁇ z direction side, and wiring is connected to the exciter 11 and the exciter 12.
- a resin layer 23 is formed by pouring resin inside the frame 25a and curing it.
- the damping material 31 and the damping material 32 which were prepared beforehand are joined to the surface of the + z direction side of the vibrating body 21a with an adhesive or an adhesive agent. In this way, the sound generator of this embodiment can be obtained.
- FIG. 4 is a plan view schematically showing the sound generator according to the second embodiment of the present invention as seen from the + z direction side.
- the differences from the acoustic generator 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 damping material 31 and the damping material 32 are integrated (the damping material 31 and the damping material 32 are integrally formed, and the damping material 31 and The damping material 32 is united).
- Other configurations are the same as those of the acoustic generator of the first embodiment described above. With such a configuration, distortion in sound generated from the sound generator can be further reduced.
- vibration transmission via the damping material 31 occurs between the vicinity of the exciter 11 in the vibrating body 21a and the vicinity of the exciter 12 in the vibrating body 21a.
- FIG. 5 is a cross-sectional view schematically showing an acoustic generator according to the third embodiment of the present invention.
- the differences from the acoustic generator of the second 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 damping material 31 and the damping material 32 are attached to the surface of the resin layer 23 on the ⁇ z direction side. That is, the damping material 31 and the damping material 32 are attached to the vibrating body 21 a via the resin layer 23.
- Other configurations are the same as those of the acoustic generator of the second embodiment described above.
- the sound generator of this embodiment having such a configuration can also obtain substantially the same effect as the sound generator of the second embodiment described above.
- the damping material 31 and the damping material 32 may be attached to the vibrating body 21 a via the exciter 11 and the exciter 12.
- the damping material 31 and the damping material 32 are preferably attached directly to the vibrating body 21a, but may be attached to the vibrating body 21a via some other object.
- FIG. 6 is a perspective view showing an acoustic generator according to the fourth embodiment of the present invention.
- the differences from the acoustic generator 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 sound generator of this embodiment includes a sound generator 29 and an enclosure 27.
- the sound generator 29 generates sound (including sound outside the audible frequency band) when an electric signal is input, and although not shown in detail, is the sound generator of the first embodiment described above. .
- the enclosure 27 has a rectangular parallelepiped box shape.
- the enclosure 27 has at least one opening, and a sound generator 29 is attached so as to close the opening.
- the enclosure 27 is comprised so that the main surface of the side by which the exciter 11 and the exciter 12 of the film 21 are arrange
- positioned may be enclosed.
- the enclosure 27 only needs to have a function of suppressing the wraparound of the sound generated on the back surface side of the sound generator 29 to the front surface side.
- the shape of the enclosure 27 is not limited to a rectangular parallelepiped shape, and may be various shapes such as a conical shape and a spherical shape.
- the enclosure 27 does not need to be box-shaped, and may be a flat baffle, for example.
- Such an enclosure 27 can be formed using various known materials.
- the enclosure 27 can be formed using materials such as wood, synthetic resin, and metal.
- the sound generator of the present embodiment generates sound using the sound generator 29 that is the sound generator of the first embodiment described above, it is possible to generate sound with good sound quality. Moreover, since the sound generator of this embodiment has the enclosure 27, it is also possible to generate sound with better sound quality than when the sound generator 29 is used alone. Instead of the sound generator of the first embodiment, another form of sound generator having the same performance may be used.
- FIG. 7 is a block diagram showing a configuration of an electronic apparatus according to the fifth embodiment of the present invention.
- the electronic device of the present embodiment includes an acoustic generator 29, an electronic circuit 60, a key input unit 50c, a microphone input unit 50d, a display unit 50e, and an antenna 50f. Yes.
- FIG. 7 is a block diagram assuming an electronic device such as a mobile phone, a tablet terminal, or a personal computer.
- the electronic circuit 60 includes a control circuit 50a and a communication circuit 50b.
- the electronic circuit 60 is connected to the sound generator 29 and has a function of outputting an audio signal to the sound generator 29.
- the control circuit 50a is a control unit of the electronic device.
- the communication circuit 50b transmits and receives data through the antenna 50f based on the control of the control circuit 50a.
- the key input unit 50c is an input device of an electronic device and accepts a key input operation by an operator.
- the microphone input unit 50d is also an input device of an electronic device, and accepts an audio input operation by an operator.
- the display unit 50e is a display output device of an electronic device, and outputs display information based on the control of the control circuit 50a.
- the sound generator 29 is the sound generator of the first embodiment described above.
- the sound generator 29 functions as a sound output device in the electronic apparatus, and generates sound (including sound outside the audible frequency band) based on the sound signal input from the electronic circuit 60.
- the sound generator 29 is connected to the control circuit 50a of the electronic circuit 60, and generates sound by receiving the application of a voltage controlled by the control circuit 50a.
- the electronic apparatus includes at least the sound generator 29 and the electronic circuit 60 connected to the sound generator 29, and has a function of generating sound from the sound generator 29. ing. Since the electronic apparatus of this embodiment generates sound using the sound generator 29 of the first embodiment described above, it can generate sound with good sound quality.
- an electronic circuit 60 for example, an electronic circuit 60, a key input unit 50c, a microphone input unit 50d, a display unit 50e, an antenna 50f, and an acoustic generator shown in FIG. 29 may be provided.
- a device main body including an electronic circuit 60, a key input unit 50c, a microphone input unit 50d, a display unit 50e, and an antenna 50f shown in FIG. 29 may be connected via an electrical lead or the like so that an electrical signal can be transmitted.
- the electronic device of the present embodiment does not have to include all of the key input unit 50c, the microphone input unit 50d, the display unit 50e, and the antenna 50f shown in FIG. 7, and the acoustic generator 29 and the electronic circuit 60 at least.
- the electronic device may have other components.
- the electronic circuit 60 is not limited to the electronic circuit 60 having the above-described configuration, and may be an electronic circuit having another configuration.
- the electronic device of the present embodiment is not limited to the above-described electronic devices such as a mobile phone, a tablet terminal, and a personal computer.
- various electronic devices having a function of generating sound and sound such as a television, an audio device, a radio, a vacuum cleaner, a washing machine, a refrigerator, and a microwave oven
- the sound generator 29 of the first embodiment described above is used to generate sound. It can be used as a device.
- another form of sound generator having the same performance may be used.
- the present invention is not limited to this.
- the exciter 11 and the exciter 12 only need to have a function of converting an electric signal into mechanical vibration, and the other having the function of converting an electric signal into mechanical vibration is the exciter 11 and the exciter 12.
- an electrodynamic exciter, an electrostatic exciter, or an electromagnetic exciter well known as an exciter for vibrating a speaker may be used as the exciter 11 and the exciter 12.
- 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.
- the present invention is not limited to this.
- three or more exciters may be attached to the surface of the film 21.
- the damping material 31 and the damping material 32 have a portion that overlaps all the exciters attached to the vibrating body 21a when viewed from the thickness direction of the vibrating body 21a. The effect of reducing can be enhanced. Even in this case, the damping material 31 and the damping material 32 do not entirely cover the vibrating body 21a, and are formed so as to overlap a part of the vibrating body 21a when viewed from the + z direction. It is desirable.
- an exciter that does not overlap the damping material 31 and the damping material 32 when viewed from the thickness direction of the vibrating body 21a.
- other damping materials may be attached to the vibrating body 21a. In this case, it is desirable that all the exciters overlap with any one of the damping materials when viewed from the thickness direction of the vibrating body 21a, but this may not be necessary depending on circumstances.
- the acoustic generator of the second embodiment shown in FIG. 4 was produced and its characteristics were evaluated.
- a slurry was prepared by kneading a piezoelectric powder containing lead zirconate titanate (PZT) in which a part of Zr was substituted with Sb, a binder, a dispersant, a plasticizer, and a solvent by ball mill mixing. .
- the green sheet was produced by the doctor blade method using the obtained slurry.
- a conductor paste containing Ag and Pd was applied to the green sheet in a predetermined shape by screen printing to form a conductor pattern serving as an internal electrode layer.
- both end surfaces in the longitudinal direction of the obtained laminate were cut by dicing, and the tips of the internal electrode layers were exposed on the side surfaces of the laminate.
- the conductor paste containing Ag and glass was apply
- a conductor paste containing Ag and glass was applied to both side surfaces in the longitudinal direction of the laminate by a dipping method, and baked in the atmosphere at 700 ° C. for 10 minutes to form terminal electrodes.
- the shape of the produced laminate was 14 mm in width, 36 mm in length, and 0.15 mm in thickness.
- polarization was performed by applying a voltage of 100 V through the terminal electrode for 2 minutes to obtain an exciter 11 and an exciter 12 which are bimorph type stacked piezoelectric elements.
- a film 21 made of PET having a thickness of 25 ⁇ m was prepared, and fixed to the frame 25a and the frame 25b in a state where tension was applied.
- the frame 25a and the frame 25b were made of stainless steel having a thickness of 0.5 mm.
- the dimensions of the film 21 in the frame 25a and the frame 25b were 100 mm in length and 60 mm in width.
- the exciter 11 and the exciter 12 were bonded to one main surface of the fixed film 21 with an adhesive made of acrylic resin, and wiring was connected to the exciter 11 and the exciter 12.
- an acrylic resin was filled inside the frame 25a so as to have the same height as the frame 25a and solidified to form a resin layer 23.
- the damping material 31 and the damping material 32 were attached to the other main surface of the film 21 with a double-sided tape.
- As the damping material 31 and the damping material 32 urethane foam having a thickness of 1 mm was used.
- the shapes and mounting positions of the damping material 31 and the damping material 32 are as shown in FIG.
- the sound generated from the sound generator of the second embodiment has a flat frequency characteristic of sound pressure compared to the sound generated from the sound generator of the comparative example.
- the distortion rate is small and the sound quality is low and the distortion is good. This confirmed the effectiveness of the present invention.
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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)
- Diaphragms For Electromechanical Transducers (AREA)
Abstract
Description
図1は、本発明の第1実施形態の音響発生器を模式的に示す、+z方向(第1方向)から見た平面図である。図2は、本発明の第1実施形態の音響発生器を模式的に示す、-z方向から見た平面図である。図3は図1におけるA-A’線断面図である。なお、図2においては、樹脂層23を透視した状態を示している。本実施形態の音響発生器は、図1~図3に示すように、励振器11および励振器12と、フィルム21と、樹脂層23と、フレーム25aおよびフレーム25bと、ダンピング材31およびダンピング材32とを有している。
図4は、本発明の第2実施形態の音響発生器を模式的に示す、+z方向側から見た平面図である。なお、本実施形態においては、前述した第1実施形態の音響発生器と異なる点について説明し、同様の構成要素には同一の参照符号を付して重複する説明を省略する。
図5は、本発明の第3実施形態の音響発生器を模式的に示す断面図である。なお、本実施形態においては、前述した第2実施形態の音響発生器と異なる点について説明し、同様の構成要素には同一の参照符号を付して重複する説明を省略する。
図6は、本発明の第4実施形態の音響発生装置を示す斜視図である。なお、本実施形態においては、前述した第1実施形態の音響発生器と異なる点について説明し、同様の構成要素には同一の参照符号を付して重複する説明を省略する。本実施形態の音響発生装置は、図6に示すように、音響発生器29と、エンクロージャー27とを有している。
図7は、本発明の第5実施形態の電子機器の構成を示すブロック図である。本実施形態の電子機器は、図7に示すように、音響発生器29と、電子回路60と、キー入力部50cと、マイク入力部50dと、表示部50eと、アンテナ50fとを有している。なお、図7は、例えば、携帯電話、タブレット端末、あるいはパーソナルコンピュータのような電子機器を想定したブロック図である。
本発明は上述した実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲において種々の変更,改良が可能である。
11h,11k,12h,12k:セグメント
21a:振動体
25a,25b:フレーム
27:エンクロージャー
29:音響発生器
31,32:ダンピング材
60:電子回路
Claims (11)
- 第1方向に間隔を開けて位置する2つの表面を有する振動体と、
該振動体に設けられた、第1励振器および第2励振器と、
前記第1方向から見たときに前記第1励振器と重なる部分である第1部分を有しており、前記振動体に設けられた、第1ダンピング材と、
前記第1方向から見たときに前記第2励振器と重なる部分である第2部分を有しており、前記振動体に設けられた、第2ダンピング材と、
を有しており、
前記第1方向から見たときに、前記第1励振器の輪郭における前記第2励振器に面しない部分を第1セグメントとし、前記第2励振器の輪郭における前記第1励振器に面しない部分を第2セグメントとすると、
前記第1方向から見たときに、前記第1ダンピング材は前記第1セグメントの少なくとも一部を跨ぐように配置されており、前記第2ダンピング材は前記第2セグメントの少なくとも一部を跨ぐように配置されている
ことを特徴とする音響発生器。 - 前記第1励振器は、前記第1方向から見たときに前記第1ダンピング材と重ならない部分である第3部分を有しており、
前記第2励振器は、前記第1方向から見たときに前記第2ダンピング材と重ならない部分である第4部分を有している
ことを特徴とする請求項1に記載の音響発生器。 - 前記第1方向から見たときに、前記第1励振器の輪郭における前記第2励振器に面する部分を第3セグメントとし、前記第2励振器の輪郭における前記第1励振器に面する部分を第4セグメントとすると、
前記第1方向から見たときに、前記第3部分は前記第3セグメントの少なくとも一部に接しており、前記第4部分は前記第4セグメントの少なくとも一部に接している
ことを特徴とする請求項2に記載の音響発生器。 - 前記第3部分の面積と前記第4部分の面積とが異なっていることを特徴とする請求項2または請求項3に記載の音響発生器。
- 前記第3部分の形状と前記第4部分の形状とが異なっていることを特徴とする請求項2乃至請求項4のいずれかに記載の音響発生器。
- 前記第1部分の面積と前記第2部分の面積とが異なっていることを特徴とする請求項1乃至請求項5のいずれかに記載の音響発生器。
- 前記第1部分の形状と前記第2部分の形状とが異なっていることを特徴とする請求項1乃至請求項6のいずれかに記載の音響発生器。
- 前記第1ダンピング材と前記第2ダンピング材とが一体化していることを特徴とする請求項1乃至請求項7のいずれかに記載の音響発生器。
- 前記振動体の少なくとも一部を被覆する樹脂層を有しており、前記第1ダンピング材および前記第2ダンピング材は、前記樹脂層を介して前記振動体に取り付けられていることを特徴とする請求項1乃至請求項8のいずれかに記載の音響発生器。
- 請求項1乃至請求項9のいずれかに記載の音響発生器と、該音響発生器に取り付けられたエンクロージャーと、を有することを特徴とする音響発生装置。
- 請求項1乃至請求項9のいずれかに記載の音響発生器と、該音響発生器に接続された電子回路と、を有することを特徴とする電子機器。
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