WO2006013966A1 - 磁性流体が充填されたスピーカ - Google Patents
磁性流体が充填されたスピーカ Download PDFInfo
- Publication number
- WO2006013966A1 WO2006013966A1 PCT/JP2005/014410 JP2005014410W WO2006013966A1 WO 2006013966 A1 WO2006013966 A1 WO 2006013966A1 JP 2005014410 W JP2005014410 W JP 2005014410W WO 2006013966 A1 WO2006013966 A1 WO 2006013966A1
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- WO
- WIPO (PCT)
- Prior art keywords
- magnetic fluid
- wire
- bobbin
- weir
- fluid sealant
- Prior art date
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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
Definitions
- an electrodynamic loudspeaker as shown in FIG. 7 is known as a kind of loudspeaker used in various acoustic devices such as stereo, radio, television, and computer.
- a voice coil 2 fixed to the center of a diaphragm 1 having a tapered cylindrical shape is disposed in a magnetic field formed by a permanent magnet 5, a magnetic pole piece 6 made of a magnetic material, and a substrate 7. It has a caulking structure.
- the voice coil 2 is formed by winding the coil 4 around the bobbin 3.
- the magnetic gap part A of the speaker is preferably filled with the magnetic fluid 10.
- the magnetic fluid 10 has a thermal conductivity approximately six times that of air, and therefore has a V effect when the heat generated by the voice coil 2 is efficiently released through the magnetic circuit.
- the frequency characteristic is improved by keeping the impedance peak low by the damping effect due to the viscosity of the magnetic fluid 10.
- it has the effect of reducing distortion due to lubrication and centering the voice coil.
- the speaker as described above has a problem that the magnetic fluid 10 oozes through the coil 4 as well as the wire 12 or the slit portion of the bobbin.
- the coil 4 is wound on a plastic or metal bobbin 3. Both ends of the coil 4 are connected to the wire 12 as leads connected to the power source, and are disposed toward the diaphragm 1 through the inner peripheral surface side of the damper 14. And it is common to connect with the lead wire 11 from the surface of the diaphragm 1 (refer patent document 1 and 2).
- the wire 12 is fixed to the outer peripheral surface of the bobbin 3 with an adhesive and / or a collar, but the gap between the surface of the bobbin 3 and the coil 4 and the wire 12 is strong in the slit portion of the bobbin 3.
- a problem has been pointed out that capillary force is generated and the magnetic fluid 10 oozes out to the collar made of paper wound around the top of the damper 14, the diaphragm 1 or the voice coil 2.
- Fig. 8 shows magnetic properties due to capillary force at the gap between the bobbin surface and the wire. It is the microscope picture which showed the state of the rise and fall of the fluid. The distance between the bobbin surface and the wire was about 50 m, and we could observe the oozing of the magnetic fluid due to the capillary force.
- Patent Document 1 JP-A-9 284892
- Patent Document 2 JP 2002-232991
- the inventor generates a strong capillary force on the slit portion of the bobbin between the bobbin surface of the voice coil and the wire, and the magnetic fluid oozes by the capillary force. I found out that it was caused.
- an adhesive may be used to fix the wire to the bobbin.
- some of the adhesives have poor oil resistance and oil permeability, so there is a problem that magnetic fluid containing oil penetrates. Atsuta.
- the adhesive is applied after the wire is placed on the bobbin surface, the adhesive does not completely penetrate to both sides of the contact line of the wire that is in contact with the bobbin surface, and a void is created. There was also a problem of bleeding.
- the capillary force is not exerted by completely sealing the gap generated on both sides of the contact line between the wire and the bobbin surface with a magnetic fluid sealant having oil resistance, or by providing a sufficiently wide gap.
- the purpose is to do so.
- the present invention employs the following configuration in order to solve the above problems.
- the wire is inserted through the weir by forming one or more weirs with magnetic fluid sealant between the wire and bobbin or covering one or more locations on the outer peripheral surface of the wire with magnetic fluid sealant It is a speaker characterized by this.
- the magnetic fluid sealant is excellent in oil resistance, does not penetrate oil, and is a material, and is described in any one of (1) to (3) above. Speaker.
- the voice coil force is pulled out of the coil in order to prevent the magnetic fluid from exuding in the wire extending.
- the speaker is characterized in that the wires are spaced apart from the bobbin so as not to cause capillary action.
- the wire drawn from the coil by the magnetic fluid sealant is attached on the bobbin, or the entire peripheral surface of the wire is covered, or a weir is formed in the slit portion, or from the coil
- FIG. 1 is a perspective view illustrating an example of an embodiment of a voice coil 2 according to the present invention.
- the coil 4 is wound around the lower part of the substantially cylindrical bobbin 3 in the voice coil 2 that is applied.
- the coil 4 is arranged in a magnetic field formed by a magnetic circuit (not shown).
- the bobbin 3 is formed by rolling a sheet of resin film such as aluminum or polyimide into a cylindrical shape. Also, by fixing the collar 15 to the bobbin 3 once, the voice coil 2 is formed.
- Wires 12 and 12 extend upward from both ends of the coil 4.
- the wires 12 and 12 may be arranged outside the collar 15 as shown in FIG. 1 or inside the collar 15 in some cases.
- weirs 20 and 20 are provided at a substantially central portion of the bobbin 3 and the wires 12 and 12 with a magnetic fluid sealant.
- the weirs 20 and 20 can be formed by applying a magnetic fluid sealant to a dispenser, a wire, or the like and applying it to the upper surfaces of the bobbins 3 and the wires 12 and 12.
- the wire 12 penetrates the weir 20 and is fixed to the bobbin 3 by the hardened magnetic fluid sealant.
- the magnetic fluid sealant forming the weirs 20, 20 for example, acrylic, epoxy, urea resin, melamine, phenol, resorcin, ⁇ -olefin, aqueous polymer Isocyanate series, butyl acetate emulsion, butyl acetate series, chloroprene rubber series, nitrile rubber series, SBR series, natural rubber series, cyanoacrylate series, polyurethane series, anaerobic adhesive, silicone series, polyamide series, EVA (ethylene (Butyl acetate), polyester, polystyrene, polyurethane, hot melt adhesives, inorganic adhesives, glues, sealing materials, fluorine based compositions, and coatings are used.
- acrylic, epoxy, urea resin, melamine, phenol, resorcin, ⁇ -olefin aqueous polymer Isocyanate series, butyl acetate emulsion, butyl acetate series, chloropre
- modified styrene butadiene rubber or the like is also preferably used.
- model number DA3188 G manufactured by Nogawa Chemical Co., Ltd.
- model number DB1600H diamond lock 5042 (manufactured by Diamond Bond Industry Co., Ltd.), model number SV varnish (manufactured by Tohoku Electric Cable Co., Ltd.)
- model number Evergrip 709—MP Al Everdal Lip
- the magnetic fluid sealant according to the present invention is not limited to these. Further, the magnetic fluid sealant may be diluted and used.
- the magnetic fluid sealant is preferably an oil repellent material that has excellent oil resistance and does not penetrate oil.
- FIG. 2 (a) is a front view showing an example of another embodiment according to the present invention. Members having the same functions as those in FIG. 1 will be described using the same reference numerals.
- a coil 4 is wound around the lower portion of a substantially cylindrical bobbin 23 in the powerful voice coil 22.
- the coil 4 is disposed in a magnetic field formed by a magnetic circuit (not shown).
- the voice coil 22 has a bobbin 23 made of aluminum or the like as in the first embodiment. It is formed by rounding into a cylindrical shape.
- a collar 15 for reinforcing the bobbin is wound around the outer periphery of the upper end of the bobbin 23.
- the wire 12 extends upward from both ends of the coil 4.
- the wire 12 is fixed by being sandwiched between the bobbin 23 and the collar 15.
- a slit 24 is formed in the bobbin 23.
- weirs 20 and 20 made of a magnetic fluid sealant are provided at two locations.
- the magnetic fluid sealant used here those exemplified in Embodiment 1 are used.
- the two wires 12, 12 pass through the weirs 20, 20, and are fixed to the bobbin 23 with a hardened magnetic fluid sealant.
- a weir 26 made of a magnetic fluid sealant is provided between the coil 4 and the collar 15 of the slit 24.
- the weir 26 is formed by applying a magnetic fluid sealant from the front side and / or the back side of the slit portion. That is, it is preferable to form the weir 26 by applying a magnetic fluid sealing agent from both the front side and the back side of the slit 24 as shown in the cross-sectional view taken along the line bb in FIG.
- Capillaries involved in the magnetic fluid leaching are generated not only in the gap between the bobbin 23 and the wires 12 and 12, but also in the slit 24.
- the width of the slit 24 is 0.06 mm or more, there is a variation in the force gap width that the magnetic fluid is considered not to bleed through the normally applied gap, or it is rare depending on the bobbin material and the caulking method. May ooze out.
- the weir 26 as described above, it is possible to completely prevent the magnetic fluid from spreading.
- FIG. 3 is a diagram for explaining the concept of the present invention, and the distance between each member is not based on the actual dimensions.
- FIG. 3 (a) shows that the weir 20 is formed directly under the collar 15 by allowing the magnetic fluid sealant to flow into the interior of the collar 15 from below the collar 15 from between the wire 12 and the bobbin 3. It shows a state of resentment. With such a configuration, it is possible to completely dam the magnetic fluid that has oozed from the coil 4 to the upper part by capillary force at the lower part of the weir 20.
- FIG. 3 (b) shows a state in which the weir 20 is formed immediately below the collar 15 by applying a magnetic fluid sealing agent from between the wire 12 and the bobbin 3 to the surface from the lower side of the collar 15 to the surface. It shows. With such a configuration, the magnetic fluid can be completely dammed at the lower part of the weir 20 and the capillary force generated in the gap between the collar 15 and the bobbin 3 can be suppressed as in the case (a).
- FIG. 3 (c) shows a state in which a magnetic fluid sealant is applied between the coil 4 and the collar 15 so as to cover the peripheral surface of the wire 12.
- the wire 12 is inserted into the weir 30 by covering the outer peripheral surface of the wire 12 with a magnetic fluid sealant.
- the magnetic fluid sealant may be coated on two or more peripheral surfaces of the wire 12.
- FIG. 3 (d) shows a state in which weirs 30 and 30 ′ are formed by coating a magnetic fluid sealant at two locations on the surface of the wire 12.
- the wire 12 is firmly fixed on the bobbin. Even with such a configuration, the capillary force generated at the portion where the wire 12 and the bobbin 3 are in contact can be completely suppressed at two locations.
- FIG. 3 (e) shows a state in which the magnetic fluid sealing agent 31 is applied in a hemispherical shape to the surface of the bobbin 3, that is, the portion in contact with the wire 12.
- the wire 12 By floating the surface of the bobbin 3 on the wire 12 by the weir 31, the wire 12 can be separated from the bobbin 3 to such an extent that no capillary force is generated.
- FIG. 3 (f) shows the lower back of the collar 15, the bobbin 3 and the wire 12.
- FIG. 5 is a cross-sectional view showing a state in which a magnetic fluid sealant is applied between the layers. With such a configuration, the capillary force generated between the collar 15 and the bobbin 3 can be eliminated.
- FIG. 4 is a cross-sectional view illustrating still another embodiment.
- a voice coil 2 fixed to a tapered cylindrical diaphragm 1 is placed in a magnetic field formed by a permanent magnet 5, a magnetic pole piece 6 made of a magnetic material, and a substrate 7. It has a placed structure.
- the wire 42 drawn upward from the coil 34 is connected to the lead wire 44 on the bobbin 3 between the diaphragm 1 and the damper 14.
- the wire 42 is arranged so as to be separated from the bobbin 3 so as not to cause capillary action.
- Bobbin 3 and wire 42 Since the gap is sufficiently separated, the capillary force is eliminated.
- a voice coil 2 shown in FIG. 1 was produced.
- the powerful boil coil 2 has an inner diameter of ⁇ 25 ⁇ , a height of 30 mm, and the collar 15 has an axial width of 11 mm.
- a coil 4 is wound around the bottom of the bobbin 3, and the height of the coil 4 is about 10 mm.
- the coil 4 was immersed in a magnetic fluid as described later.
- the product name APG812 manufactured by Flotech
- samples of Examples 1 to 8 were prepared by forming the weir 20 by applying the following magnetic fluid sealants to the plurality of voice coils 2 respectively.
- the weir 20 was formed in a substantially circular shape by applying a ferrofluid sealant before curing to a ⁇ 1 mm wire and applying it on the wire 12 near the middle of the coil 4 and the collar 15.
- the weir 20 was formed by the hardening of the magnetic fluid sealant, and the wire 12 was fixed to the bobbin 3.
- the wire 12 is insulatively coated with varnish.
- Magnetic fluid sealant Modified styrene butadiene rubber 'Product name DA3188G (manufactured by Nogawa Chemical)
- the diameter of the weir 20 (the diameter represents the maximum diameter; the same applies hereinafter) was 2.5 mm on the left and 4.8 mm on the right.
- Magnetic fluid sealant Chloroprene rubber-based synthetic rubber 'Product name DB1600H (manufactured by Diabond Industries Co., Ltd.)
- the diameter of the weir 20 was 3.8 mm on the left and 4.9 mm on the right.
- Magnetic fluid sealant Acrylic monomer 'Product name Dialock 5042 (Diabond Industry Co., Ltd.)
- the diameter of the weir 20 was 3.2 mm on the left and 4.2 mm on the right.
- Magnetic fluid sealant nitrile rubber 'Product name Evergrip 709— MP (manufactured by Allon Everzip)
- the diameter of the weir 20 was 5.0 mm on the left and 4.8 mm on the right.
- Magnetic fluid sealant UV acrylic ⁇ Product name 3106 (manufactured by Loctite)
- the diameter of the weir 20 was 3.2 mm on the left and 2.8 mm on the right.
- Magnetic fluid sealant Cyanacrylate series' Product name 410 (manufactured by Loctite)
- the diameter of the weir 20 was 4.7 mm on the left and 4.2 mm on the right.
- Magnetic fluid sealant Two-component epoxy system 'Product name E-20HP (manufactured by Loctite) The diameter of the weir 20 was 3.5 mm on the left and 3.5 mm on the right.
- the voice coil 2 in the conventional product shown in Fig. 7 was prepared. At the top of the voice coil 2, a power error is wound.
- the wire was clamped and fixed between the bobbin and the collar, and the adhesive was not applied.
- the shape and size of the bobbin, the coil structure, etc. are the same as those in the above embodiment.
- the wire is insulated with a varnish.
- voice coil 2 After flowing the above magnetic fluid into an aluminum petri dish having a bottom diameter of 52 mm, an upper diameter of 60 mm, and a height of 20 mm so that the magnetic fluid has a depth of 5 mm, voice coil 2 is immersed in the magnetic fluid. As a result, the coil of voice coil 2 was immersed by about 1Z2 of the partial force coil height. The voice coil 2 was left in the aluminum petri dish as it was, and the exudation of the magnetic fluid in the wire portion was observed after 8 hours, 24 hours and 144 hours by visual observation.
- the reference value was set from a to d depending on the degree of magnetic fluid exudation.
- Exudation reference value a Magnetic fluid is exuding to the weir part (in the middle of the wire) only on one side of the wire.
- Exudation reference value b Magnetic fluid exuded to the weir part (in the middle of the wire) for both wires.
- Exudation reference value c Magnetic fluid exudes to the color, and less than 1Z2 of the color surface area is soiled with magnetic fluid.
- Exudation standard value d Magnetic fluid exudes to the color of both wires, and 1Z2 or more of the color surface area becomes dirty with the magnetic fluid.
- FIG. 5 is a diagram showing the oozing of the magnetic fluid and the standard of each reference value.
- the thick line on the wire corresponds to the exuded part.
- Fig. 5 (a) corresponds to the exudation reference value a, (b) corresponds to the exudation reference value b, (c) to (e) correspond to the exudation reference value c, and (f) corresponds to the exudation reference value d.
- Table 1 shows the results of the above test.
- Examples 9 to 17 were prepared by applying a magnetic fluid sealant to form various weirs shown below.
- Mode of weir A mode in which the wire is inserted inside the weir by covering the outer peripheral surface of the wire with a magnetic fluid sealant [see Fig. 3 (c). ]
- Magnetic fluid sealant E-20HP (manufactured by Loctite)
- Mode of weir The inside of the weir is covered by coating the outer peripheral surface of the wire with a magnetic fluid sealant.
- Mode of wire insertion [See Fig. 3 (c). ]
- a magnetic fluid sealant is applied to the bobbin surface where the wire comes in contact [see Fig. 3 (e). ].
- the distance between the bobbin surface and the wire was about 50 / z m.
- Mode of weir A mode in which the wire is inserted inside the weir by covering the outer peripheral surface of the wire with a magnetic fluid sealant [see Fig. 3 (c). ]
- Mode of weir A mode in which the wire passes through the weir by covering the outer peripheral surface of the wire with a magnetic fluid sealant [see Fig. 3 (c). ]
- Magnetic fluid sealant E 20HP Weir diameter: Left 4.3Z Right 4.5mm
- Mode of weir A mode in which the wire is inserted inside the weir by covering the outer peripheral surface of the wire with a magnetic fluid sealant [see Fig. 3 (c). ]
- the voice coil 2 in the conventional product shown in Fig. 7 was prepared. At the top of the voice coil 2, a power error is wound.
- the wire was clamped and fixed between the bobbin and the collar, and the adhesive was not applied.
- the shape and size of the bobbin and the coil structure are the same as those in the above embodiment.
- the wire is insulated with a varnish.
- Example 9 HD1600H a Yes Example 10 HD1600H a Yes Example 11 E-20HP a Yes Example 12 E-20HP a Yes Example 13 E-20HP a Yes Example 14 E-20HP b Yes Example 15 E-20HP a Yes Example 16 E-20HP b Yes Example 17 E-20HP a Yes Comparative Example 2 ⁇ d No [0037] From Table 2 above, in the voice coils of Examples 9 to 17, the magnetic fluid did not bleed more than necessary. On the other hand, in the case of Comparative Example 2, the magnetic fluid oozed up to the color of both the magnetic fluid and the wire when the room temperature standing time was 144 hours.
- FIG. 6 is a photograph showing the state after 144 hours of contact between the voice coil and the magnetic fluid in Examples and Comparative Examples. 6 (a) shows the voice coil of Example 16, and FIG. 6 (b) shows the voice coil of Comparative Example 2. FIG. From the photograph, it was confirmed that the voice coil of Comparative Example 2 had a color surface area of 1Z2 or more contaminated with magnetic fluid.
- FIG. 1 is a perspective view illustrating an example of an embodiment of a voice coil according to the present invention.
- FIG. 2 (a) is a front view illustrating an example of one embodiment of another voice coil according to the present invention.
- (B) is the fragmentary sectional view of (a).
- FIG. 3 (a) is a partial conceptual view showing an example of another embodiment of a voice coil according to the present invention.
- (B) is another partial conceptual diagram
- (c) is yet another partial conceptual diagram
- (d) is yet another partial conceptual diagram
- (e) is yet another partial conceptual diagram
- (f) is yet another.
- FIG. 4 is a cross-sectional view illustrating an example of another embodiment of a voice coil according to the present invention.
- FIG. 5 is a diagram showing the relationship between magnetic fluid exudation and each reference value.
- FIG. 6 is a photograph showing a state after contacting the magnetic fluid in the voice coils of Example 16 and Comparative Example 2 for 144 hours.
- FIG. 7 is a cross-sectional view showing an example of a conventional speaker filled with magnetic fluid.
- FIG. 8 is a micrograph showing the state of magnetic fluid scooping up by capillary force at the gap between the bobbin surface and the wire.
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- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
Description
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Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004-230493 | 2004-08-06 | ||
JP2004230493 | 2004-08-06 |
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WO2006013966A1 true WO2006013966A1 (ja) | 2006-02-09 |
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Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55150586U (ja) * | 1979-04-13 | 1980-10-30 | ||
JPS55165587U (ja) * | 1979-05-15 | 1980-11-28 | ||
JPS57100397U (ja) * | 1980-12-10 | 1982-06-21 | ||
JPS57100398U (ja) * | 1980-12-10 | 1982-06-21 | ||
JPS58106996A (ja) * | 1981-12-18 | 1983-06-25 | Matsushita Electric Ind Co Ltd | スピ−カ |
JPS61267944A (ja) * | 1985-05-22 | 1986-11-27 | Mitsubishi Electric Corp | 光学的デイスク記録再生装置 |
JPH0631296U (ja) * | 1992-09-28 | 1994-04-22 | フオスター電機株式会社 | スピーカ用ボイスコイル |
JP3035201U (ja) * | 1996-08-29 | 1997-03-11 | 株式会社フェローテック | 磁性流体の滲み防止付シャフト |
JPH10177389A (ja) * | 1996-12-17 | 1998-06-30 | Citizen Electron Co Ltd | 電磁発音体 |
JP2003274485A (ja) * | 2002-03-19 | 2003-09-26 | Sony Corp | スピーカー製造方法及びスピーカー |
-
2005
- 2005-08-05 WO PCT/JP2005/014410 patent/WO2006013966A1/ja active Application Filing
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55150586U (ja) * | 1979-04-13 | 1980-10-30 | ||
JPS55165587U (ja) * | 1979-05-15 | 1980-11-28 | ||
JPS57100397U (ja) * | 1980-12-10 | 1982-06-21 | ||
JPS57100398U (ja) * | 1980-12-10 | 1982-06-21 | ||
JPS58106996A (ja) * | 1981-12-18 | 1983-06-25 | Matsushita Electric Ind Co Ltd | スピ−カ |
JPS61267944A (ja) * | 1985-05-22 | 1986-11-27 | Mitsubishi Electric Corp | 光学的デイスク記録再生装置 |
JPH0631296U (ja) * | 1992-09-28 | 1994-04-22 | フオスター電機株式会社 | スピーカ用ボイスコイル |
JP3035201U (ja) * | 1996-08-29 | 1997-03-11 | 株式会社フェローテック | 磁性流体の滲み防止付シャフト |
JPH10177389A (ja) * | 1996-12-17 | 1998-06-30 | Citizen Electron Co Ltd | 電磁発音体 |
JP2003274485A (ja) * | 2002-03-19 | 2003-09-26 | Sony Corp | スピーカー製造方法及びスピーカー |
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