WO2008047423A1 - Dispositif haut-parleur et appareil portable - Google Patents

Dispositif haut-parleur et appareil portable Download PDF

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Publication number
WO2008047423A1
WO2008047423A1 PCT/JP2006/320727 JP2006320727W WO2008047423A1 WO 2008047423 A1 WO2008047423 A1 WO 2008047423A1 JP 2006320727 W JP2006320727 W JP 2006320727W WO 2008047423 A1 WO2008047423 A1 WO 2008047423A1
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WO
WIPO (PCT)
Prior art keywords
magnetic
voice coil
gap
speaker device
magnetic gap
Prior art date
Application number
PCT/JP2006/320727
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English (en)
Japanese (ja)
Inventor
Sinsuke Konuma
Original Assignee
Pioneer Corporation
Tohoku Pioneer Corporation
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 Pioneer Corporation, Tohoku Pioneer Corporation filed Critical Pioneer Corporation
Priority to PCT/JP2006/320727 priority Critical patent/WO2008047423A1/fr
Publication of WO2008047423A1 publication Critical patent/WO2008047423A1/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
    • H04R9/06—Loudspeakers
    • H04R9/063—Loudspeakers using a plurality of acoustic drivers

Definitions

  • the present invention relates to a structure of a speaker device that can be suitably used for a portable device or the like.
  • Patent Document 1 describes a speaker having this type of configuration.
  • the speaker described in Patent Document 1 has two upper and lower magnetic circuits provided with magnetic gaps that are parallel and have opposite magnetic flux directions, and a U-shaped frame coupled to the magnetic circuits.
  • a diaphragm having a substantially center coupled to the upper portion of the voice coil and an outer periphery coupled to a frame or the like, and a damper having a substantially center coupled to the lower portion of the voice coil and the outer periphery coupled to the frame or the like. Due to the powerful structure, the minimum resonance frequency fO can be lowered even with an elongated structure with a narrowed aperture and width, which can improve input resistance, bass reproduction, and sound pressure frequency characteristics. ing.
  • Patent Document 2 discloses a magnetic air gap in which a voice coil is disposed between a center pole and a plate for the purpose of transferring heat generated by the voice coil to a magnetic circuit via a magnetic fluid to dissipate heat.
  • a speaker in which a magnetic fluid is injected is described.
  • Patent Document 1 Japanese Patent Laid-Open No. 11 187484
  • Patent Document 2 Japanese Patent Laid-Open No. 2003-274485
  • the present invention provides a speaker device having a magnetic fluid capable of stably supporting a vibrating body without causing an increase in minimum resonance frequency fO and a decrease in sound pressure level, and a portable device using the speaker device. This is the issue.
  • the invention according to claim 1 is a speaker device, comprising: a vibrating body having a diaphragm and a voice coil; a frame; and a magnetic circuit, wherein the magnetic circuit includes: A second magnetic gap, and the voice coil includes first and second parallel portions extending in one direction and facing each other, and the first parallel portion of the voice coil is the magnetic coil.
  • the first parallel part of the voice coil is arranged in the first magnetic gap of the circuit
  • the second parallel part of the voice coil is arranged in the second magnetic gap of the magnetic circuit
  • the first parallel part of the voice coil is The magnetic circuit is elastically supported by a magnetic fluid injected into the first magnetic gap.
  • FIG. 1 is a front view, a rear view, and a side view of a speaker device according to a first embodiment of the present invention.
  • FIG. 2 is a front view and a side view of a frame according to the first embodiment.
  • FIG. 3 is a cross-sectional view taken along a position passing through the central axis of the speaker device according to the first embodiment.
  • FIG. 4 is a graph showing the relationship between the magnetic fluid viscosity and acoustic characteristics.
  • FIG. 5 is a graph showing acoustic characteristics of a speaker device having magnetic fluid and a speaker device not having magnetic fluid.
  • FIG. 6 is a cross-sectional view cut at a position passing through the central axis of the speaker device according to the second embodiment.
  • FIG. 7 is a cross-sectional view cut at a position passing through the central axis of a speaker device according to a modification.
  • FIG. 8 is a plan view of a mobile phone using the speaker device of the present invention.
  • FIG. 9 is a plan view of another mobile phone using the speaker device of the present invention.
  • a vibrating body having a diaphragm and a voice coil, a frame, and a magnetic circuit
  • the magnetic circuit includes first and second magnetic gaps.
  • the voice coil includes first and second parallel portions extending in one direction and facing each other, and the first parallel portion of the voice coil is the first magnetic gap of the magnetic circuit.
  • the second parallel portion of the voice coil is disposed in the second magnetic gap of the magnetic circuit, and the first parallel portion of the voice coil is the first parallel portion of the magnetic circuit. It is inertially supported by a magnetic fluid injected into the magnetic gap.
  • the speaker device includes a vibrating body having a diaphragm and a voice coil, a frame, and a magnetic circuit.
  • the magnetic circuit includes first and second magnetic gaps.
  • the voice coil has first and second parallel parts extending in one direction and facing each other.
  • the first parallel portion of the voice coil is disposed in the first magnetic gap of the magnetic circuit.
  • the second parallel portion of the voice coil is disposed in the second magnetic gap of the magnetic circuit.
  • the first parallel portion of the voice coil is elasticized by a magnetic fluid injected (or filled, loaded, interposed, or held) into the first magnetic gap of the magnetic circuit. It is supported by.
  • the magnetic fluid plays a role as a damper for inertially supporting the first parallel portion of the voice coil in the first magnetic gap of the magnetic circuit. Therefore, it is not necessary to provide a damper to elastically support the first parallel portion side of the voice coil. For this reason, the first parallel portion of the voice coil is less likely to roll, and abnormal vibration such as rolling can be suppressed, and along with this, the first parallel portion side of the voice coil Contact with the magnetic circuit can be avoided, and abnormal noise can be suppressed. Even if the vibrating body vibrates excessively for some reason, the excessive vibration of the vibrating body can be suppressed by the arrangement of the magnetic fluid as described above.
  • the first magnetic gap extends longer than the first parallel portion, and the magnetic fluid flows in the first magnetic gap in the first magnetic gap. It is injected so as to cover the parallel part.
  • the first magnetic gap includes an opening that is not filled with the magnetic fluid, and the opening is disposed at both ends of the first magnetic gap.
  • a vibrating body that is located on the opposite side to the acoustic radiation direction and that does not completely seal the back side of the speaker device and does not increase the minimum resonance frequency fO or decrease the sound pressure level.
  • the magnetic fluid can be prevented from coming into contact with the vibrating body as compared with the above-mentioned speaker of Patent Document 2 (comparative example), and the minimum resonance frequency fO is increased. Decrease in sound pressure level can be suppressed.
  • the magnetic circuit includes a pair of first plates disposed to face each other via the first magnetic gap, and a pair of magnets disposed on the pair of first plates. And a pair of second plates opposed to each other via the second magnetic gap on the pair of magnets, and the diaphragm is a voice coil support portion that supports the voice coil;
  • a sound emitting part formed continuously with one end of the voice coil support part, wherein the voice coil support part has a shape extending in the opposite direction to the acoustic radiation direction, and the center of the magnetic circuit;
  • the sound emitting part has a shape that is curved toward the sound radiation direction
  • the frame has a shape that surrounds the vibrating body, and the outer peripheral part of the sound emitting part is the It is preferably attached to the frame.
  • a mobile device for example, a mobile phone
  • the above speaker device can be configured.
  • FIG. 1 (a) shows a front view of the speaker device 100 according to the first embodiment of the present invention when observed from the sound radiation direction.
  • FIG. 1 (b) shows a rear view of the speaker device 100.
  • FIG. FIG. 1 (c) shows a side view corresponding to the longitudinal direction of the speaker device 100.
  • FIG. 2 (a) shows a front view of the frame 4 which is an element of the device 100.
  • Figure 2 (b) shows a side view of the frame 4 corresponding to the longitudinal direction.
  • FIG. 3 shows a cross-sectional view along a cutting line AA ′ passing through the center axis L1 of the speaker device 100 in FIG. 1 (a). 3 shows a cross-sectional view of the speaker device 100 attached to the baffle (attached portion) 32 for convenience of explanation.
  • the speaker device 100 is preferably used as a speaker for a portable device such as a mobile phone or a micro speaker, and mainly includes a pair of first plates la and lb, a pair of magnets 2a and 2b, and a pair of magnets.
  • An inner magnet type magnetic circuit 30 having a second plate 3a and 3b and a magnetic fluid 80; a vibrating body 31; and a frame 4 supporting the magnetic circuit 30 and the vibrating body 31.
  • the vibrating body 31 mainly includes the diaphragm 5 and the voice coil. 6 is included.
  • magnet 2a or first plate la when each magnet and each first or second plate are distinguished from each other, they will be referred to as magnet 2a or first plate la, respectively. Indicated as 2 or 1st plate 1.
  • the configuration of the magnetic circuit 30 is as follows.
  • Each of the pair of first plates la and lb has a substantially rectangular parallelepiped shape and a substantially rectangular bar shape, and is located at both ends in the longitudinal direction of each of the first plates la and lb.
  • notches lac and lbc are formed by cutting out part of the side.
  • Each of the pair of first plates la and lb is opposed to each other with a side surface on which the notch lac is formed and a side surface on which the notch lbc is formed facing each other at a predetermined distance. Yes.
  • the width of the gap on both ends in the longitudinal direction of the pair of first plates la and lb (the width of the gap is the length of the gap in the direction of the magnetic flux passing through the voice coil 6.
  • the width of the gap located between both ends is set to d2 ( ⁇ dl). That is, a first gap 70aa having a constant width d2 and a second gap 70ab having a constant width dl (> d2) are formed between the pair of first plates la and 1b facing each other. ing.
  • the length in the longitudinal direction of the first gap 70aa is substantially the same as the length in the longitudinal direction of the voice coil 6 described later.
  • the same length d3 is set, and the length of the second gap 70ab in the longitudinal direction is set to d4 ( ⁇ d3).
  • the first gap 70aa The relative length relationship between the longitudinal length and the longitudinal length of the second gap 70ab is not limited to the above, and the first gap 70aa and the second gap 70ab
  • the first magnetic gap 70a has two gaps having different widths and lengths, that is, a first gap 70aa and a second gap 70ab.
  • the “second gap 70ab” is also referred to as an “opening 70ab.”
  • the first magnetic gap 70a includes a pair of magnets 2a and 2b described later. The magnetic flux is concentrated and the direction of the magnetic flux generated in the first magnetic gap 70a is For example, it is set in the direction of arrow Y2.
  • the magnetic fluid 80 is injected into the first gap 70aa of the first magnetic gap 70a.
  • the magnetic fluid 80 is not injected into the second gap (opening) 70ab provided on both ends thereof.
  • the opening 70ab allows air to enter and exit without being filled with the magnetic fluid 80. That is, a region where the magnetic fluid 80 is not injected is provided between the pair of first plates la and lb, that is, in the first magnetic gap 70a. Air can enter and exit between.
  • the magnetic fluid 80 can be an extremely stable colloidal solution in which ferromagnetic ultrafine particles such as magnetite are surface-treated and dispersed in a solvent.
  • the magnetic fluid 80 is held in a stable state in the first gap 70aa by the magnetic field generated in the first gap 70aa.
  • the magnetic fluid 80 has a function of radiating heat generated in the first parallel portion 6a, which is an element of the voice coil 6 described later, to the air through the first plate 1 and the like, and the magnetic flux in the first gap 70aa. Has the function of increasing density.
  • the magnetic fluid 80 has a function of pushing the object to the outside of the magnetic fluid 80 if an extra object enters the magnetic fluid 80.
  • the magnetic fluid 80 is a portion of the vibrating body 31 corresponding to the position of the first parallel portion 6a, specifically, the voice coil installing portion 51 of the diaphragm 5.
  • the vibrator 31 can be freely and freely moved in the direction of the central axis L1 when the speaker device 100 is driven. It plays a role as a so-called damper.
  • Each of the pair of magnets 2a and 2b has a rectangular parallelepiped shape and a square bar shape, and each of the magnets 2a and 2b faces each other with a certain gap therebetween, and each of the pair of first plates la and lb. It is attached to each upper surface via an adhesive.
  • the relative polarities of the inner surface of one magnet 2a and the inner surface of the other magnet 2b opposite to the inner surface are set to be opposite to each other. That is, although not shown, when the polarity of the inner surface of one magnet 2a is S pole (or N pole), the polarity of the inner surface of the other magnet 2b opposite to it is N pole (or S pole).
  • Each of the pair of second plates 3a and 3b has a rectangular parallelepiped shape and a square rod shape, and each of the pair of magnets 2a and 2b is opposed to each other with a certain gap therebetween. It is attached to each upper surface via an adhesive.
  • a second magnetic gap 70b having a certain gap is formed between the pair of second plates 3a and 3b.
  • the magnetic flux of the pair of magnets 2a and 2b is concentrated in the second magnetic gap 70b.
  • the direction of the magnetic flux generated in the second magnetic gap 70b is set in the direction of the arrow Y3, which is opposite to the direction of the magnetic flux generated in the first magnetic gap 70a, and the second magnetic gap 70b.
  • the magnitude of the magnetic force generated in the first magnetic gap 70a is set to be relatively the same. In the present invention, the magnetic fluid 80 is not present in the second magnetic gap 70b.
  • the frame 4 has an elongated shape and a shape surrounding the vibrating body 31.
  • Frame 4 includes a diaphragm mounting portion 4a for mounting the outer peripheral portion 53 of the diaphragm 5, and an elongated opening 4b provided in the center for inserting the voice coil mounting portion 51 of the diaphragm 5. And a side surface 4s provided at a position continuous with both ends in the longitudinal direction, and an opening 4h formed by cutting out a part of the side surface 4s.
  • the frame 4 is preferably formed of a resin material that can be easily molded.
  • 3b and the outer wall (outer surface) of 3b are attached via an adhesive, and the side surface 4s of the frame 4 has a role of supporting these members, respectively.
  • the configuration of the vibrating body 31 is as follows.
  • the diaphragm 5 which is an element of the vibrator 31, has an elliptical planar shape as shown in FIG.
  • the diaphragm 5 includes a voice coil installation part (voice coil support part) 51, a sound emitting part 52 that plays a role of emitting sound waves, an attachment part 53 attached to the diaphragm attachment part 4a of the frame 4, Is provided.
  • the voice coil installation portion is disposed at the center position of the diaphragm 5 in the short direction. And has a shape extending toward the opposite side to the acoustic radiation direction Yl.
  • the sound emission part 52 is formed on the outer periphery of the voice coil installation part 51 so as to be connected to each end of the voice coil installation part 51, and has a curved shape (semicircle) in the acoustic radiation direction Y1. Cross-sectional shape).
  • the attachment portion 53 is provided on the outer peripheral portion of the sound emitting portion 52.
  • the voice coil installation portion 51 has a direction substantially perpendicular to the arrow Y2 direction and the arrow Y3 direction, which are the magnetic flux extending directions. It extends in a horizontal direction.
  • the depth of the voice coil installation part 51 is substantially the same as the distance to the vicinity of the upper end of the pair of first plates la and lb and the rear side force frame 4.
  • the voice coil installation part 51 is arranged at a substantially central position in the magnetic circuit 30. As a result, the speaker device 100 is made thinner and slimmer.
  • the voice coil installation part 51 has an elongated shape and a bag-like or U-shaped cross-sectional shape, and a gap with a constant width is formed in a direction substantially orthogonal to the extending direction, that is, in the short direction of the diaphragm 5. And the gap forms a rectangular parallelepiped space.
  • the width of the gap is preferably set as narrow as possible to increase the magnetic flux density, for example, about 0.2 mm.
  • the voice coil 6 is fixed in a state of being sandwiched between the inner surfaces of the voice coil installation part 51, and the voice coil installation part 51 mainly plays a role of supporting the voice coil 6.
  • the voice coil 6, which is an element of the vibrator 31, has one plus / minus lead wire (not shown), and is formed so as to form an elliptical and annular (ring-shaped) planar shape. It is turned.
  • the voice coil 6 is arranged to face the first parallel portion 6a extending in one direction and the first parallel portion 6a with a certain gap 6d in the sound wave emission direction.
  • a connecting part (not shown) that connects the second parallel part 6b extending in a direction parallel to 6a, each end part of the first parallel part 6a, and each end part of the corresponding second parallel part 6b. And arranged in the voice coil installation part 51 of the diaphragm 5.
  • the first parallel portion 6a is located in the first gap 70aa of the first magnetic gap 70a.
  • the first parallel part 6a is provided with a prescribed stationary in the first gap 7 Oaa by the magnetic fluid 80 provided between the pair of first plates la and lb via the voice coil installation part 51. Held in position.
  • the second parallel portion 6b has a second magnetic portion. Located in the gap 70b.
  • the positive lead wire of the voice coil 6 is an input wiring for an L (or R) channel signal
  • the negative lead wire is an input wiring for a ground (GND) signal.
  • Each lead wire is electrically connected to each output wiring on the amplifier side (not shown). For this reason, a signal and power (hereinafter also simply referred to as “voice current”) are input to the voice coil 6 from the amplifier side through the respective lead wires.
  • voice current a signal and power
  • the voice current flows so as to circulate, so the direction of the voice current flowing in the first parallel part 6a and the direction of the voice current flowing in the second parallel part 6b Is relatively opposite.
  • the audio current output from the amplifier side is input to the voice coil 6 through each lead wire of the voice coil 6.
  • a driving force is generated in the first parallel part 6a and the second parallel part 6b of the voice coil 6 in the first magnetic gap 70a and the second magnetic gap 70b, respectively.
  • the magnitude of the magnetic force generated in the first magnetic gap 70a and the magnitude of the magnetic force generated in the second magnetic gap 70b are set to the same magnitude as described above, and the first magnitude In the parallel part 6a and the second parallel part 6b, audio currents of the same magnitude flow in the opposite directions.
  • the first parallel portion 6a and the second parallel portion 6b vibrate in the same direction with the same driving force based on Fleming's left-hand rule.
  • the first parallel portion 6a is based on a straight line L2 passing through the center in the thickness direction of the pair of first plates la and lb
  • the second parallel portion 6b is a pair of second plates
  • the plates 3a and 3b vibrate in the same direction with the same driving force in the direction of the central axis L1 of the speaker device 100, with reference to the straight line L3 passing through the center in the thickness direction.
  • the speaker device 100 radiates sound waves in the acoustic radiation direction Y1 through the sound emitting unit 52 of the diaphragm 5.
  • the speaker device 100 includes a vibrating body 31 having a diaphragm 5 and a voice coil 6, a frame 4, and a magnetic circuit 30.
  • the magnetic circuit 30 includes a first magnetic gap 70a and a second magnetic gap 70b.
  • the voice coil 6 includes a first parallel portion 6a and a second parallel portion 6b that extend in one direction and face each other.
  • the first parallel part 6a of the voice coil 6 is
  • the second parallel part 6b of the voice coil 6 is arranged in the second magnetic gap 70b of the magnetic circuit 30.
  • the second parallel part 6b of the voice coil 6 is arranged in the first magnetic gap 70b of the magnetic circuit 30.
  • the first parallel portion 6 a of the voice coil 6 is inertially supported by the magnetic fluid 80 injected into the first magnetic gap 70 a of the magnetic circuit 30.
  • the magnetic fluid 80 is placed in the first magnetic gap 70a at the lower end side of the vibrating body 31, that is, the first parallel portion 6a and the voice coil installation portion 51 of the diaphragm 5 that supports it. It serves as a damper that elastically supports the partial side. Therefore, it is not necessary to provide a damper to elastically support the lower end side of the vibrating body 31. For this reason, the lower end side of the vibrating body 31 located in the first parallel portion 6a is less likely to roll, and abnormal vibrations such as rolling can be suppressed, and accordingly, the vibrating body Contact between the lower end of 31 and the magnetic circuit 30 can be avoided, and abnormal noise can be suppressed. Even if the vibrating body 31 vibrates excessively for some reason, the excessive vibration of the vibrating body 31 can be suppressed by the action of the magnetic fluid 80 described above.
  • FIG. 4 is a graph showing the relationship between the viscosity (mPa's; millipascal second) of the magnetic fluid 80, the sound pressure ⁇ SPL; Sound Pressure Level (dB) ⁇ , and the frequency characteristics (Hz).
  • Daraf G 1 shows the acoustic characteristics of a speaker device to which a magnetic fluid 80 having a viscosity of 200 mpa ⁇ s is applied at room temperature 27 ° C
  • graph G2 shows a magnetic flow having a viscosity of 500 mpa 's.
  • the acoustic characteristics at room temperature 27 ° C of the speaker device to which the body 80 is applied are shown, and the graph G3 shows the acoustic characteristics at 27 ° C of room temperature of the speaker device to which the magnetic fluid 80 having a viscosity of 1500 mpa ⁇ s is applied. From the graph of FIG. 4, it is understood that the acoustic characteristics can be changed according to the viscosity of the magnetic fluid 80.
  • the back side of the magnetic circuit 30 located on the opposite side to the acoustic radiation direction Y1 is not covered with other members or the like. Therefore, after the speaker device 100 is assembled, the magnetic field is introduced into the first gap 70aa of the first magnetic gap 70a from the rear side. Sexual fluid 80 can be injected.
  • This has the following advantages. That is, in the manufacturing process of the speaker unit 100, after injecting the magnetic fluid 80 into the first gap 70aa of the first magnetic gap 70a, the diaphragm 5 is attached to the diaphragm mounting portion of the frame 4 via an adhesive.
  • the voice coil installation part 51 of the diaphragm 5 When attached to 4a, the voice coil installation part 51 of the diaphragm 5 is pushed out of the prescribed position of the first magnetic gap 70a, for example, in the acoustic radiation direction Y1 by the buoyancy of the magnetic fluid 80.
  • the adhesive may be peeled off and the diaphragm 5 may be lifted off the frame 4 and detached.
  • the rear side force is also increased in the first gap of the first magnetic gear 70a. Since the magnetic fluid 80 can be injected into 70aa, it is possible to prevent the above problems from occurring.
  • the first magnetic gap 70a extends longer than the first parallel portion 6a, and the magnetic fluid 80 is in the first magnetic gap 70a in the first parallel direction. It is injected so as to cover the part 6a. Further, the first magnetic gap 70a is not filled with the magnetic fluid 80! /, And is provided with a second gap (opening) 70ab. The opening has both ends in the longitudinal direction of the first magnetic gap 70a. It is arranged in the part.
  • the back side of the speaker device 100 which is located on the opposite side to the acoustic radiation direction Y1 is not completely sealed, so that air can flow in and out between the outside and the inside of the magnetic circuit 30. It becomes possible.
  • the speaker device 100 is attached to a baffle (attached portion) 32, and the space in the sound radiation direction is defined as S3 with the baffle 32 as a boundary.
  • the space on the back side of the speaker device 100 located on the opposite side is S 2, and the space S 3 is a sealed space through the diaphragm 5, the frame 4, the baffle 32, and the like.
  • the magnetic fluid 80 can be prevented from coming into contact with the vibrating body 31 and the lowest resonance frequency can be prevented in the first embodiment as compared with the speaker (comparative example) of Patent Document 2 described above. It is possible to suppress the increase in fO and the decrease in sound pressure level.
  • the speaker device 100 of the first embodiment having the magnetic fluid 80 and the speaker device (the other devices having no magnetic fluid 80 in the configuration of the first embodiment)
  • Graph G3 shows the acoustic characteristics of the speaker device 100 according to the first embodiment
  • graph G4 shows the acoustic characteristics of the speaker device according to another comparative example that does not have the magnetic fluid 80.
  • the lowest resonance frequency fO of the speaker device 100 according to the first embodiment is around 1000 Hz
  • the lowest resonance frequency f0 of the speaker device according to another comparative example is around 900 Hz.
  • the values of the minimum resonance frequency f0 of both are substantially the same. From this, it is understood that in the first embodiment, the increase in the minimum resonance frequency f0 is suppressed.
  • the sound pressure characteristics of the speaker device 100 according to the first example are substantially the same as the sound pressure characteristics of the speaker device according to the other comparative examples. Therefore, in the first example, the sound pressure characteristic is You can also see that there is no decline.
  • the first magnetic gap 70a is not completely sealed with the magnetic fluid 80 in this way, it is not necessary to provide an opening in the diaphragm 5, and accordingly, an increase in man-hours can be prevented, and the component cost can be reduced. It is possible to prevent the strike from increasing and to prevent the low frequency characteristics from deteriorating with the formation of the opening in the diaphragm 5. If the first magnetic gap 70a is completely sealed with the magnetic fluid 80, the space S1 between the diaphragm 5 and the magnetic circuit 30 is sealed, and the back side of the diaphragm 5 is closed. As the air volume decreases, the minimum resonance frequency f0 increases and the sharpness of resonance (Q value) increases, resulting in a decrease in acoustic characteristics.
  • the magnetic circuit 30 includes a pair of first plates la and lb and a pair of first plates la and 1b disposed to face each other via the first magnetic gap 70a. It has a pair of magnets 2a and 2b arranged above, and a pair of second plates 3a and 3b arranged on the pair of magnets 2a and 2b via a second magnetic gap 70b.
  • the diaphragm 5 has a voice coil installation part (voice coil support part) 51 that supports the voice coil 6, and a sound emission part 52 that is connected to one end of the voice coil installation part (voice coil support part) 51.
  • the voice coil installation part (voice coil support part) 51 has a shape (concave cross-sectional shape) extending in the opposite direction with respect to the acoustic radiation direction Y1, and is located at the center of the magnetic circuit 30. Placed in the section.
  • the sound emitting part 52 has a shape curved in the acoustic radiation direction Y1.
  • the frame 4 has a shape surrounding the vibrating body 31.
  • the attachment portion 53 is disposed on the outer peripheral portion of the sound emitting portion 52 and attached to the diaphragm attachment portion 4a of the frame 4. Since the vibrating body 31 is supported by the magnetic fluid 80 held in the first magnetic gap 70a and the outer peripheral portion of the sound emitting section 52 attached to the frame 4, the vibrating body 31 is supported in an inertial manner. Therefore, it is not necessary to inject the magnetic fluid 80 into the second magnetic gap 70b.
  • FIG. 6 is a cross-sectional view showing a configuration of the speaker device 200 according to the second embodiment corresponding to FIG.
  • the diaphragm 5x does not have the bag-like voice coil installation portion 51 for dropping and supporting the voice coil 6 as in the first embodiment. It has a voice coil installation part 54 which is a voice coil support part having a concave cross section for supporting 6 in a suspended state.
  • the second parallel portion 6 b of the voice coil 6 is attached to the lower surface side of the voice coil installation portion 54.
  • the first parallel portion 6a is disposed in the first gap 70aa of the first magnetic gap 70a, and is supported by the magnetic fluid 80 injected into the first gap 70aa.
  • the second parallel portion 70b is disposed in the second magnetic gap 70b where the magnetic fluid 80 is not injected.
  • the voice coil 6 is supported while being suspended from the diaphragm 5.
  • the magnetic fluid 80 is injected into the first magnetic gear 70a, and the lower end side of the vibrating body 31, that is, the first magnetic gear 70a.
  • the parallel portion 6a is inertially supported by the magnetic fluid 80 in the first magnetic gap 70a. Accordingly, the magnetic fluid 80 plays a role as a damper that elastically supports the lower end portion side of the vibrating body 31, that is, the first parallel portion 6a side, in the first magnetic gap 70a. Therefore, it is not necessary to provide a damper to elastically support the lower end side of the vibrating body 31.
  • the lower end side of the vibrating body 31 located in the first parallel portion 6a is less likely to roll, and abnormal vibrations such as rolling can be suppressed, and accordingly, the vibrations Contact between the lower end of the body 31 and the magnetic circuit 30 can be avoided, and abnormal noise can be suppressed. Even if the vibrating body 31 vibrates excessively for some reason, the excessive vibration of the vibrating body 31 can be suppressed by the arrangement of the magnetic fluid 80 as described above.
  • FIG. 7 shows a cross-sectional configuration of a speaker device 300 according to a modification having one magnetic gap to which the present invention is applied.
  • a speaker device 300 includes a first plate lx having an elongated shape, and a pair of magnets 2a and 2b disposed to face each other with a certain gap on the first plate lx.
  • the diaphragm 5y and the voice coil 6 have substantially the same shape as the first embodiment except that the magnetic circuit 30x having the magnetic fluid 80 injected therein and the depth of the voice coil installation portion 51 are different.
  • the first plate lx is combined with the first plate la and the first plate lb according to the first embodiment in order to obtain advantages such as suppressing the increase in the minimum resonance frequency fO described above. It is preferable to have a flat shape.
  • a magnetic fluid 80 is injected into one magnetic gap 70c, and the lower end side of the vibrating body 31, that is, the first parallel portion 6a and the diaphragm that supports it.
  • the partial side of the 5y voice coil installation part 51x is inertially supported by the magnetic fluid 80 in one magnetic gap 70c. Therefore, it is located in the first parallel part 6a
  • the lower end side of the vibrating body 31 is less likely to roll, and abnormal vibrations such as rolling can be suppressed, and along with this, the lower end side of the vibrating body 31 contacts the magnetic circuit 30. Can be avoided, and abnormal noise can be suppressed. Even if the vibrating body 31 vibrates excessively for some reason, the excessive vibration of the vibrating body 31 can be suppressed by the arrangement of the magnetic fluid 80 as described above.
  • the speaker device 100 (or one of the speaker devices 200 and 300, the same applies hereinafter) according to the first embodiment of the present invention is applied to a receiving unit and a receiving unit in a mobile phone will be described.
  • FIG. 8 is a schematic plan view showing the configuration of this mobile phone.
  • the cellular phone device 800 illustrated in the figure is provided with a plurality of operation buttons 800a, a display unit 800b, a receiving ring 800c and a mouthpiece 800d provided on the front side of the case 800g, and an incoming call alarm provided on the back side of the case 800g.
  • the receiving unit 800e having a function of making a sound and a transmission / reception antenna 800f provided on one side of the case 800g are configured.
  • the powerful device 100 is mounted in the case 800g, and is provided, for example, at a position corresponding to the receiving telephone 800c and the receiving unit 800e.
  • a speaker device 100 or the like can be provided on the side surface side of the mobile phone 900.
  • the speaker device of the present invention can be suitably applied to various mobile devices other than such mobile phones. Since the speaker device of the present invention is reduced in thickness and size, the use of such a speaker device in a portable device typified by such a cellular phone contributes to the reduction in thickness and size of the portable device. Can give. This also makes it possible to use a powerful speaker device as a micro speaker.
  • the present invention can be used for portable devices or electronic devices equipped with microspeakers. You can.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

L'invention concerne un dispositif haut-parleur comprenant un vibrateur possédant un diaphragme et une bobine accoustique, un châssis et un circuit magnétique. Ce circuit magnétique possède un premier et un second espace magnétique. La bobine accoustique possède une première et une seconde partie parallèles s'étendant dans une direction qui s'opposent entre elles. La première partie parallèle est agencée dans le premier espace magnétique, la seconde partie parallèle est agencée dans le second espace magnétique, et la première partie parallèle est élastiquement supportée par un fluide magnétique injecté dans le premier espace magnétique. Le premier espace magnétique s'étend plus loin que la première partie parallèle, et le fluide magnétique est injecté de façon à recouvrir la première partie parallèle dans le premier espace magnétique. Le premier espace magnétique possède des ouvertures non remplies avec le fluide magnétique, et ces ouvertures sont agencées aux extrémités opposées du premier espace magnétique. Avec un tel agencement du fluide magnétique, le vibrateur peut être supporté de manière stable sans entraîner une augmentation des fréquences de résonances les plus basses ni abaisser un niveau de pression sonore.
PCT/JP2006/320727 2006-10-18 2006-10-18 Dispositif haut-parleur et appareil portable WO2008047423A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2006/320727 WO2008047423A1 (fr) 2006-10-18 2006-10-18 Dispositif haut-parleur et appareil portable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2006/320727 WO2008047423A1 (fr) 2006-10-18 2006-10-18 Dispositif haut-parleur et appareil portable

Publications (1)

Publication Number Publication Date
WO2008047423A1 true WO2008047423A1 (fr) 2008-04-24

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Application Number Title Priority Date Filing Date
PCT/JP2006/320727 WO2008047423A1 (fr) 2006-10-18 2006-10-18 Dispositif haut-parleur et appareil portable

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Country Link
WO (1) WO2008047423A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108260057A (zh) * 2016-12-29 2018-07-06 奥音科技（北京）有限公司 一种磁路系统及其制造方法、微型扬声器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6392497U (fr) * 1986-12-05 1988-06-15
JPH11187484A (ja) * 1997-12-19 1999-07-09 Matsushita Electric Ind Co Ltd スピーカ
JPH11234795A (ja) * 1998-02-10 1999-08-27 Sharp Corp 電気音響変換器
JP2003032789A (ja) * 2001-05-11 2003-01-31 Matsushita Electric Ind Co Ltd スピーカ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6392497U (fr) * 1986-12-05 1988-06-15
JPH11187484A (ja) * 1997-12-19 1999-07-09 Matsushita Electric Ind Co Ltd スピーカ
JPH11234795A (ja) * 1998-02-10 1999-08-27 Sharp Corp 電気音響変換器
JP2003032789A (ja) * 2001-05-11 2003-01-31 Matsushita Electric Ind Co Ltd スピーカ

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108260057A (zh) * 2016-12-29 2018-07-06 奥音科技（北京）有限公司 一种磁路系统及其制造方法、微型扬声器

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