WO2010106689A1 - Dispositif de génération de vibrations - Google Patents

Dispositif de génération de vibrations Download PDF

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Publication number
WO2010106689A1
WO2010106689A1 PCT/JP2009/055533 JP2009055533W WO2010106689A1 WO 2010106689 A1 WO2010106689 A1 WO 2010106689A1 JP 2009055533 W JP2009055533 W JP 2009055533W WO 2010106689 A1 WO2010106689 A1 WO 2010106689A1
Authority
WO
WIPO (PCT)
Prior art keywords
vibration
vibration generating
generating device
supported
vibrates
Prior art date
Application number
PCT/JP2009/055533
Other languages
English (en)
Japanese (ja)
Inventor
実 堀米
博之 小林
俊博 引地
Original Assignee
パイオニア株式会社
東北パイオニア株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by パイオニア株式会社, 東北パイオニア株式会社 filed Critical パイオニア株式会社
Priority to JP2011504702A priority Critical patent/JP5037724B2/ja
Priority to PCT/JP2009/055533 priority patent/WO2010106689A1/fr
Publication of WO2010106689A1 publication Critical patent/WO2010106689A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/04—Construction, mounting, or centering of coil
    • H04R9/041—Centering
    • H04R9/043—Inner suspension or damper, e.g. spider

Definitions

  • the present invention relates to a vibration generator.
  • a vibration generating apparatus that generates vibration by inputting an electric signal is, for example, a vibration generating member (for example, a voice coil) that applies vibration to the vibrating member (for example, a diaphragm) and a vibration direction of the vibrating member (for example, a diaphragm) as in a speaker apparatus described later.
  • a vibration generating member for example, a voice coil
  • FIG. 1 is an explanatory view showing a conventional speaker device.
  • a dynamic speaker device is known as a general speaker device (see, for example, Patent Document 1). As shown in FIG.
  • the dynamic speaker device is joined to a frame 3J, a cone-shaped diaphragm 21J, an edge 4J that supports the diaphragm 21J on the frame 3J, and an inner peripheral portion of the diaphragm 21J.
  • the voice coil bobbin 610J, the damper 7J that supports the voice coil bobbin 610J on the frame 3J, the voice coil 611J wound around the voice coil bobbin 610J, the yoke 51J, the magnet 52J, and the plate 53J, and the voice coil 611J are arranged. And a magnetic circuit in which a magnetic gap is formed.
  • the voice coil bobbin 610J vibrates due to the Lorentz force generated in the voice coil 611J in the magnetic gap, and the diaphragm 21J is driven by the vibration.
  • the vibration generator in which the vibration direction of the vibration member is the same as the vibration direction of the vibration generation member has a problem that the total height of the vibration direction is inevitably large.
  • a voice coil 611J is disposed on the side opposite to the acoustic radiation side of the diaphragm 21J, and the voice coil 611J and the voice coil bobbin 610J are arranged. Since the vibration direction and the vibration direction of the vibration plate 21J are configured to be the same direction, a region where the vibration plate 21J vibrates, a region where the voice coil bobbin 610J vibrates, a region where a magnetic circuit is disposed, etc. Is formed along the vibration direction (acoustic radiation direction) of the diaphragm 21J, and the overall height of the speaker device must be relatively large.
  • the size of the diaphragm 21J of the speaker device along the vibration direction is the same as the size of the cone-shaped diaphragm 21J along the vibration direction and the diaphragm 21J is supported by the frame 3J.
  • the height of the edge 4J (a), the voice coil bobbin height (b) from the junction of the diaphragm 21J and the voice coil bobbin 610J to the upper end of the voice coil 611J, the voice coil height (c), and the main magnet of the magnetic circuit It consists of the height (d) and the thickness (e) of the yoke 51J mainly of the magnetic circuit.
  • the vibration direction of the vibration generating member and the vibration direction of the vibrating member are the same direction.
  • the overall height of the device becomes large, and it is difficult to reduce the thickness of the device. That is, there is a problem that it is difficult to achieve both a reduction in thickness and an increase in amplitude of the device.
  • the present invention is an example of a problem to deal with such a problem.
  • it is possible to reduce the thickness of the device along the vibration direction while obtaining a large vibration of the vibration member, and to reduce the thickness of the device, and to improve the high-frequency cutoff characteristics in a device that generates sound from the vibration member. This is the object of the present invention.
  • the vibration generator according to the present invention comprises at least the configuration according to the following independent claims.
  • [Claim 1] A stationary part, a vibration member supported by the stationary part so as to freely vibrate, and a driving part that is supported by the stationary part and applies vibrations to the vibrating member, the driving part including the vibration A vibration generating member that vibrates in a direction different from that of the member, and a vibration transmission unit that changes the direction of the vibration of the vibration generation member and transmits the vibration to the vibration member.
  • One end of the vibration transmission unit is fixed to the vibration generation member.
  • a vibration generating apparatus comprising: a rigid moving connecting portion connected to the direction changing portion so as to move and having the other end portion fixed to the vibrating member.
  • the vibration generator 1 includes a stationary part 100, a vibration member 10 supported by the stationary part 100 so as to freely vibrate in one axial direction (for example, the Z-axis direction), and a stationary part 100. And a drive unit 14 that applies vibration to the vibration member 10.
  • the drive unit 14 vibrates in one axial direction (for example, the X-axis direction) different from the vibration member 10, and the vibration of the vibration generation member 13.
  • the vibration transmission unit 50 includes a vibration transmission unit 50 that converts the direction of the vibration to the vibration member 10 and has one end fixed to the vibration generation member 13 and gradually along the vibration direction of the vibration generation member 13 (for example, the X-axis direction).
  • the rigid direction changer 51 having a moved surface 51A that rises in the vibration direction (for example, the Z-axis direction) of the vibration member 10, and one end portion or a part disposed near the one end portion moves on the moved surface 51A.
  • Direction to It is connected to the section 51, and a mobile connecting part 52 of the rigid second end portion is fixed to the vibration member 10.
  • the vibration member 10 has a planar cross-section, but the vibration member 10 is not limited to this, and a V-shaped (conical shape) or U-shaped (dome-shaped) cross section or the like. It may be.
  • the shape in plan view may be any shape such as a substantially rectangular shape, a substantially circular shape, or a substantially elliptical shape.
  • the stationary part 100 is a general term for parts that support the vibration of the vibration member 10 and the like, and here, the frame 12 corresponds to the stationary part 100.
  • the stationary unit 100 supports the driving unit 14, but the driving unit 14 itself can also be the stationary unit 100.
  • the stationary part 100 itself is not intended to be completely stationary, and the whole stationary part 100 vibrates due to the influence of vibration of the driving part 14 described later or other forces. There may be.
  • the outer peripheral portion of the vibration member 10 is supported by a frame 12 that is a stationary portion 100 via an edge 11.
  • the driving unit 14 includes a vibration generating member 13 and a vibration transmitting unit 50.
  • the vibration generating member 13 is provided with a magnetic circuit 20 for generating vibration.
  • the vibration generating member 13 vibrates along the X-axis direction, and the vibration member 10 is supported so as to freely vibrate in the Z-axis direction orthogonal to the X-axis direction. The direction of the vibration in the axial direction is changed, and the vibration member 10 is vibrated in the Z-axis direction.
  • the vibration transmitting unit 50 has a moving surface 51A in which a direction changing unit 51 having one end fixed to the vibration generating member 13 gradually rises in the Z-axis direction along the X-axis direction. Further, the moving member 52A that moves on the moving surface 51A is provided, and the other end of the moving connecting portion 52 that is connected to the direction changing portion 51 so that one end portion moves on the moving surface 51A is connected to the vibration member 10. It is connected. In addition, the tip (the other end) of the direction changing portion 51 is open, and the moving body 51A is inserted from the open tip during assembly.
  • the direction changing unit 51 When the vibration generating member 13 vibrates in the X-axis direction, the direction changing unit 51 translates accordingly, moves on the moving surface 51A by the parallel movement of the direction changing unit 51, and is connected to the vibrating member 10 to connect the X axis.
  • the position of the moving body 51A that is restricted from moving in the direction is shifted in the Z-axis direction.
  • the shift of the position of the moving body 51A in the Z-axis direction is transmitted to the vibrating member 10 via the moving connecting portion 52, and the vibrating member 10 vibrates in the Z-axis direction.
  • a plurality of direction changing portions 51 are provided with respect to the vibration generating member 13 and are arranged so as to be substantially parallel to each other. Accordingly, the vibration member 10 is supported at a plurality of locations, and the vibration of the vibration generating member 13 can be stably transmitted to the vibration member 10. Further, the entire vibration member 10 can be vibrated with substantially the same phase.
  • the moving surface 51A of the direction changing section 51 extends at a certain angle with respect to the vibration direction (X-axis direction) of the vibration generating member 13, and
  • the direction changing unit 51 has a linearly moved surface 51A. According to this, the vibration member 10 can be vibrated in the Z-axis direction while ensuring linearity with the vibration in the X-axis direction of the vibration generating member 13.
  • the direction changing portion 51 has a moved surface 51A that curves in a convex shape toward the vibration member 10 side. According to this, the vibration in the X-axis direction of the vibration generating member 13 can be nonlinearly converted into the vibration in the Z-axis direction of the vibration member 10. By arbitrarily setting the bending state, the vibration behavior in the vibration member 10 can be arbitrarily set.
  • the amplitude of the vibration member 10 with respect to the amplitude of the vibration generating member 13 can be arbitrarily set.
  • the moving surface 51 ⁇ / b> A that is curved in a convex shape included in the direction changing portion 51 is formed such that its inclination gradually decreases from the vibration generating member 13 side to the vibrating member 10. Therefore, when the vibration generating member 13 vibrates to the right side on the drawing, for example, when the vibration generating member 13 vibrates to the right side in the drawing, the amplitude of the vibrating member 10 is relatively small. Become. Further, when the vibration generating member 13 vibrates to the left side, the amplitude of the vibration member 10 that vibrates downward becomes relatively large.
  • the direction changing unit 51 has a moved surface 51 ⁇ / b> A that is curved concavely on the vibration member 10 side. According to this, the vibration in the X-axis direction of the vibration generating member 13 can be nonlinearly converted into the vibration in the Z-axis direction of the vibration member 10. By arbitrarily setting the bending state, the vibration behavior in the vibration member 10 can be arbitrarily set.
  • the amplitude of the vibration member 10 with respect to the amplitude of the vibration generating member 13 can be arbitrarily set.
  • the moving surface 51 ⁇ / b> A that is curved in a concave shape included in the direction changing portion 51 is formed such that its inclination gradually increases from the vibration generating member 13 side to the vibrating member 10. Therefore, when the vibration generating member 13 vibrates to the right side on the drawing, for example, when the vibration generating member 13 vibrates to the right side in the drawing, the amplitude of the vibrating member 10 is relatively large. Become. Further, when the vibration generating member 13 vibrates to the left side, the amplitude of the vibration member 10 that vibrates downward is relatively small.
  • the vibration generating member 13 vibrates, the vibrating member 10 vibrates, the volume of air between the vibrating member 10 and the frame 12 also changes, and the expansion and compression are repeated.
  • the amount of change in the air volume differs depending on whether the vibrating member vibrates upward or downward.
  • the volume of air the volume of the region surrounded by the frame 12 and the vibration member 10.
  • the difference in the amount of change in air between expansion and compression tends to become more prominent.
  • the amount of change in air when the vibration generating member 13 vibrates is substantially equal to the volume of air when the vibration generating member 13 is stationary.
  • the amplitude of the vibration member 10 when the vibration generation member 13 vibrates to the left (“pulling") is several times that of the vibration member 10 when the vibration generation member 13 vibrates to the right (“push”). May be doubled. This is because the amount of change when the air is compressed is smaller than the amount of change when the air is expanded, in other words, the resistance force of the air acts on the vibration member 10. Therefore, by making the amplitude of the vibration generating member 13 different in the vibration direction (left side or right direction), such as the vibration generating device 1B and the vibration generating device 1C shown in FIGS. The amplitude of the vibration member 10 in the upper and lower vibration directions can be made substantially the same.
  • the moving body 51A is slid with respect to the moving surface 51A.
  • the present invention is not limited to this, and is shown in FIGS. 3A to 3C.
  • the vibration of the vibration generating member 13 is changed in direction by the vibration transmitting unit 50 and transmitted to the vibrating member 10, so that the vibration is increased by increasing the amplitude of the vibration generating member 13. Even if the vibration of the member 10 is increased, the thickness (total height) of the vibration generator 1 does not increase. Thus, a thin vibration generator 1 that can generate vibration with a large amplitude can be obtained.
  • the drive unit 14 includes a vibration generating member 13 and a magnetic circuit 20 that vibrates the member 13. 4 and 5 show configuration examples of the vibration generating member 13 and the magnetic circuit 20.
  • the vibration generating member 13 includes a vibration generating coil 30.
  • the vibration generating coil 30 is formed, for example, by winding a conducting wire to which a vibration signal is input, or is formed using an annular conductive member. Further, for example, a wound conducting wire or an annular conductive member becomes the vibration generating member 13 and is supported by the stationary part 100 so as to be able to vibrate or supported via the coil support part 40 so as to be capable of vibrating freely. Is done.
  • the coil support portion 40 can be formed of, for example, a flat insulating member 41, and the vibration generating coil 30 is supported on the surface or inside thereof.
  • the insulating member 41 is formed in an annular shape so that an opening 41b is formed inside the vibration generating coil 30 for weight reduction. Further, when the vibration generating coil 30 itself is provided with rigidity and formed into a flat plate shape, the coil support portion 40 can be omitted.
  • the magnetic circuit 20 for vibrating the vibration generating coil 30 not only forms the magnetic gap 20G along the vibration direction of the vibration generating coil 30, but also with respect to the current (audio current) flowing through the vibration generating coil 30.
  • the magnetic gap 20G forms a pair of magnetic fields in opposite directions.
  • the vibration generating coil 30 vibrates along the arrangement direction of the magnetic gap 20G in which a pair of magnetic fields are formed.
  • the magnetic circuit 20 is formed by a magnet 21 and a yoke portion 22, and is formed by arranging a pair of magnetic gaps 20G that form opposite magnetic fields in the Z-axis direction at predetermined intervals in the X-axis direction. By winding the vibration generating coil 30 so that the currents flowing in the Y direction are opposite to each other, the Lorentz force along the X axis direction acts on the vibration generating coil 30.
  • the magnetic circuit 20 having the same function as described above can be formed by arranging the magnet 21 and the yoke portion 22 in several different forms.
  • the magnetic circuit 20 includes a plurality of magnets 21 (21A to 21D).
  • the magnets 21 are provided on both sides along the direction of the magnetic field of the magnetic gap 20G.
  • the yoke portion 22 includes a lower yoke portion 22A, an upper yoke portion 22B, and a column portion 22C.
  • the yoke portions 22A and 22B are disposed substantially parallel to each other with a specified interval, and the column portion 22C is formed at the center portion so as to extend in a direction substantially orthogonal to the yoke portions 22A and 22B. .
  • Magnets 21A to 21D are arranged in the yoke portions 22A and 22B, and one magnetic gap 20G2 is formed by the magnet 21A and the magnet 21C, and another magnetic gap 20G1 is formed by the magnet 21B and the magnet 21D.
  • the pair of magnetic gaps 20G1 and 20G2 are formed side by side in a plane, and magnetic fields in opposite directions are formed.
  • the vibration generating coil 30 has a substantially rectangular planar shape, and linear portions 30A and 30C formed along the Y-axis direction and linear portions 30B and 30D formed along the X-axis direction. It is comprised by.
  • the straight portions 30A and 30C of the vibration generating coil 30 are disposed in each magnetic gap 20G of the magnetic circuit 20, and the direction of the magnetic field is defined so as to be along the Z-axis direction. It is preferable not to apply a magnetic field to the straight portions 30B and 30D of the vibration generating coil 30. Further, even when a magnetic field is applied to the straight portions 30B and 30D, the Lorentz forces generated in the straight portions 30B and 30D are configured to cancel each other.
  • the vibration generating coil 30 can have a relatively large portion in the magnetic gap 20G by relatively increasing the number of turns, and can obtain a relatively large driving force during driving.
  • the vibration generating coil 30 is supported by a coil support portion 40 made of an insulating member 41, and an example in which an opening 41b is formed in the insulating member 41 is shown. Further, the vibration generating coil 30 can be given rigidity so as to be formed into a plate shape as a whole. When the vibration generating coil 30 has rigidity, the coil support portion 40 may not be used.
  • FIG. 6 is an explanatory view showing an example of a support structure of the vibration generating member 13.
  • the vibration generating member 13 is supported by a guide portion 60 provided in the stationary portion 100 and vibrates in a uniaxial direction. Further, as necessary, the vibration generating unit 13 is held by the stationary unit 100 via a holding unit 15 having elasticity in the X-axis direction.
  • An example of the guide unit 60 shown in FIG. 6A is a slide-type guide unit 60. This is because a sliding body 62 is slidably supported on a sliding body 61 extending along the vibration direction (X-axis direction) of the vibration generating member 13, and the sliding body 62 is vibrated by a connecting portion 63. It is connected to the generating member 13.
  • the example of the guide part 60 shown to the same figure (b) and (c) is the roller-type guide part 60.
  • the support roller 65 is provided with a guide groove 65A into which the side edge of the vibration generating member 13 is fitted.
  • the vibration generating member 13 is supported in parallel with the XY plane by a pair of left and right support rollers 65, and vibrates only in the X-axis direction. Supports freely.
  • the vibration generator 1 changes the direction of vibration of a vibration generating coil (hereinafter referred to as a voice coil) 30 by a vibration transmitting unit 50 and is referred to as a vibration member (hereinafter referred to as a diaphragm). 10), the thickness of the speaker device in the sound radiation direction (the overall height of the speaker device) does not increase even if the amplitude of the diaphragm 10 is increased by increasing the amplitude of the voice coil 30. This makes it possible to obtain a thin speaker device that can emit a large volume of reproduced sound.
  • a voice coil hereinafter referred to as a voice coil
  • a vibration member hereinafter referred to as a diaphragm
  • the vibration transmitting unit 50 reliably transmits the vibration of the voice coil 30 to the diaphragm 10 by a mechanical direction changing mechanism having a relatively simple structure, a speaker device with high reproduction efficiency can be obtained while realizing a reduction in thickness. It is possible to radiate high-quality reproduced sound with a relatively simple structure.
  • the diaphragm 10 Since the back surface of the diaphragm 10 can be supported by a plurality of moving connecting portions 52 at different positions, the diaphragm 10 can be vibrated integrally even if the diaphragm 10 is large in area. High-quality reproduced sound can be radiated while suppressing the divided vibration of. In particular, it is effective when low-frequency sound reproduction is performed by increasing the area of the diaphragm 10, and high-quality low-frequency sound reproduction is possible while achieving thinning of the speaker device. In addition, since the diaphragm 10 can be supported in a plurality of locations and can be vibrated in parallel, the entire surface can be vibrated in the same phase even with a relatively large diaphragm.
  • the vibration transmitting unit 50 employs a mechanism in which the moving body 52A moves on the surface 51A to be moved, and is a direction changing mechanism that does not have a joint that enables refraction, the high-frequency reproduction limit is relatively low. Can be expanded to the high frequency side. As a result, high-quality sound reproduction can be performed with high quality.
  • FIG. 7 is an explanatory view showing an electronic apparatus including the speaker device according to the embodiment of the present invention.
  • the electronic device 2 such as a mobile phone or a portable information terminal shown in FIG. 1A or the electronic device 3 such as a flat panel display shown in FIG. Since the space can be reduced, the entire electronic device can be made thinner. In addition, sufficient audio output can be obtained even in a thin electronic device.
  • FIG. 8 is an explanatory view showing an automobile provided with a speaker device using the vibration generator according to the embodiment of the present invention.
  • the interior space can be expanded by reducing the thickness of the speaker device.
  • the speaker device according to the embodiment of the present invention when installed in the door panel, the protrusion of the door panel is eliminated, and the operation space for the driver can be expanded. Also, since sufficient audio output can be obtained, music and radio broadcasting can be enjoyed comfortably in the car even during high-speed driving with a lot of noise. Further, it can also be used for electronic devices such as a body sonic device (body sonic), a game machine, a vibration device (vibration) used in a mobile phone, and an exciter.
  • a hotel or ryokan that can accommodate a large number of people, such as a house (building) used for the residence of people, a meeting, a lecture, a party, etc.
  • the speaker device 1 When the speaker device 1 is installed in a training facility or building (building), the thickness space necessary for installing such a speaker device can be reduced, so that unnecessary space can be deleted and the space can be used effectively. it can.
  • there have been examples of providing living rooms with audio / video equipment while living rooms without audio / video equipment have been provided. In some cases, etc. are used as theater rooms.
  • a living room or the like can be easily converted into a theater room, and the space in the living room can be effectively utilized.
  • examples of the location of the speaker device include a ceiling and a wall in a living room.
  • each of the above-described embodiments can divert each other's technology as long as there is no particular contradiction or problem in its purpose and configuration.
  • the technology in each of the above-described embodiments can be applied to a dynamic speaker device that uses a flat voice coil as necessary (eg, a riffel speaker device, a ribbon speaker device, a sound emitting side of a flat voice coil).
  • the present invention can be applied to a speaker device in which a magnetic pole portion is disposed on the side opposite to the acoustic radiation side, and the speaker device can be thinned.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

La présente invention concerne un dispositif de génération de vibrations (1) comprenant un élément vibrant (10) qui peut avoir une grande amplitude de vibration et qui est peu épais dans le sens de la vibration. Le dispositif de génération de vibrations (1) comprend une section fixe (100), et l'élément vibrant (10) est supporté par la section fixe (100) de sorte à pouvoir vibrer dans une direction uniaxiale. Le dispositif de génération de vibrations (1) comprend également une section d'entraînement (14) qui est supportée par la section fixe (100) et qui applique des vibrations sur l'élément vibrant (10). La section d'entraînement (14) comprend un élément de génération de vibrations (13) qui vibre dans une direction uniaxiale qui est différente de la direction de l'élément vibrant (10), et elle comprend également une section de transmission de vibrations (50) qui est apte à transmettre des vibrations de l'élément de génération de vibrations (13) à l'élément vibrant (10) après changement de la direction de la vibration. La section de transmission de vibrations (50) comprend des sections de conversion de direction (51) dotées d'une certaine rigidité qui augmente progressivement dans la direction de vibration de l'élément vibrant (10), dans la direction de vibration de l'élément de génération de vibrations (13). Ces sections comprennent chacune une extrémité fixée à l'élément de génération de vibrations (13) et elles ont des surfaces (51A) devant être déplacées. La section de transmission de vibrations (50) comprend également des sections mobiles et de raccordement (52) dotées d'une certaine rigidité, qui ont chacune une extrémité raccordée à une section de conversion de direction correspondante (51) de sorte à se déplacer sur la surface (51A) pour être amenées en mouvement, et qui ont l'autre extrémité fixée à l'élément vibrant (10).
PCT/JP2009/055533 2009-03-19 2009-03-19 Dispositif de génération de vibrations WO2010106689A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2011504702A JP5037724B2 (ja) 2009-03-19 2009-03-19 振動発生装置
PCT/JP2009/055533 WO2010106689A1 (fr) 2009-03-19 2009-03-19 Dispositif de génération de vibrations

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2009/055533 WO2010106689A1 (fr) 2009-03-19 2009-03-19 Dispositif de génération de vibrations

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WO2010106689A1 true WO2010106689A1 (fr) 2010-09-23

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63250995A (ja) * 1987-04-07 1988-10-18 Citizen Watch Co Ltd 薄型スピ−カ
JPS6454899A (en) * 1987-08-25 1989-03-02 Foster Electric Co Ltd Speaker
JP2005159409A (ja) * 2003-11-20 2005-06-16 Minebea Co Ltd スピーカ用振動板およびこの振動板を使用したスピーカ

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63250995A (ja) * 1987-04-07 1988-10-18 Citizen Watch Co Ltd 薄型スピ−カ
JPS6454899A (en) * 1987-08-25 1989-03-02 Foster Electric Co Ltd Speaker
JP2005159409A (ja) * 2003-11-20 2005-06-16 Minebea Co Ltd スピーカ用振動板およびこの振動板を使用したスピーカ

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JPWO2010106689A1 (ja) 2012-09-20
JP5037724B2 (ja) 2012-10-03

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