WO2011007403A1 - 電磁変換器 - Google Patents

電磁変換器 Download PDF

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Publication number
WO2011007403A1
WO2011007403A1 PCT/JP2009/005701 JP2009005701W WO2011007403A1 WO 2011007403 A1 WO2011007403 A1 WO 2011007403A1 JP 2009005701 W JP2009005701 W JP 2009005701W WO 2011007403 A1 WO2011007403 A1 WO 2011007403A1
Authority
WO
WIPO (PCT)
Prior art keywords
diaphragm
top surface
frame
permanent magnet
joined
Prior art date
Application number
PCT/JP2009/005701
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
吉田俊治
Original Assignee
三菱電機エンジニアリング株式会社
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 三菱電機エンジニアリング株式会社 filed Critical 三菱電機エンジニアリング株式会社
Priority to CN200980122480.6A priority Critical patent/CN102067630B/zh
Priority to KR1020107028525A priority patent/KR101064071B1/ko
Publication of WO2011007403A1 publication Critical patent/WO2011007403A1/ja

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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
    • H04R9/046—Construction
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
    • H04R2209/024—Manufacturing aspects of the magnetic circuit of loudspeaker or microphone transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
    • H04R2209/027—Electrical or mechanical reduction of yoke vibration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/16—Mounting or tensioning of diaphragms or cones
    • H04R7/18—Mounting or tensioning of diaphragms or cones at the periphery

Definitions

  • the present invention relates to an electromagnetic transducer that reproduces sound from an audio signal by combining a permanent magnet and a diaphragm.
  • a spiral voice coil pattern is formed on a sheet of a thermosetting resin polyimide, a thermoplastic resin polyethylene terephthalate (PET), or a liquid crystal polymer, and both ends are bent.
  • the diaphragm has a U-shaped cross section. The top surface of the diaphragm and the frame are joined by elastic edges, and the voice coil patterns on both ends of the diaphragm are held so as to come to the magnetic flux generating portion of the magnetic circuit. For this reason, even if the amplitude of the diaphragm increases, the vertical displacement width of the voice coil pattern can be accommodated in the magnetic flux generating portion.
  • this diaphragm has a problem that it is low in rigidity because both ends in the longitudinal direction are bent and both ends in the short direction are not bent, and abnormal noise is likely to occur due to unnecessary resonance caused by vibration. It was. Furthermore, since a support system such as an edge for fixing the diaphragm to the frame can be joined only to the top surface of the diaphragm, piston vibration is disturbed at a large amplitude, and a magnetic gap defect due to rolling is likely to occur.
  • the speaker of Patent Document 2 is formed by forming a voice coil pattern in advance on a thermosetting resin sheet such as a polyimide sheet or a prepreg of a laminated sheet made of a glass resin and an epoxy resin, and then heat-molding the sheet U. It has a letter-shaped dome-shaped diaphragm. The entire periphery of the diaphragm and the frame are joined together with an edge, and a support plate is fixed inside the diaphragm, and the support plate is joined to a damper on the frame side. For this reason, rigidity can be improved by making a diaphragm into a dome shape, and the support structure of a diaphragm can be made partially but double.
  • a thermosetting resin sheet such as a polyimide sheet or a prepreg of a laminated sheet made of a glass resin and an epoxy resin
  • the magnetic circuit has to be divided in order to fix the damper to the frame, resulting in an increase in the number of parts. Further, when the magnetic circuit is divided and arranged, the magnetic flux density is uneven or the magnetic flux density is lowered.
  • thermosetting resin sheet on which the voice coil pattern is formed is molded into a three-dimensional structure and then cured by heat treatment.
  • thermoplastic resin sheet it is necessary to stretch the thermoplastic resin sheet on which the voice coil pattern is formed by drawing by hot pressing to obtain a three-dimensional shape.
  • the elongation rate of the thermoplastic resin sheet and the elongation rate of the voice coil pattern formed on the sheet are different, there is a problem that the coil and the sheet are broken when the drawing is performed.
  • the cost of the thermosetting resin is higher than that of the thermoplastic resin.
  • the present invention has been made to solve the above-described problems, and an object of the present invention is to obtain an electromagnetic transducer having excellent performance by causing a diaphragm to vibrate with a double support structure having a small number of parts.
  • the electromagnetic transducer comprises a magnetic circuit comprising a permanent magnet, a frame in which one magnetic pole surface of the permanent magnet is fixed and the other magnetic pole side is open, and a plate fixed to the other magnetic pole surface, and a plate.
  • a vibration plate having a top surface at a covering position and four side surfaces formed between the plate and the frame opening, and having a voice coil pattern formed on one or both surfaces.
  • the diaphragm is joined to the top peripheral edge of the plate and the peripheral edge of the frame opening, and joined to the first support portion that holds the diaphragm in a displaceable manner, the peripheral edge of the side surface of the diaphragm, and the inner peripheral surface of the frame. And a second support part that holds the slidable member freely.
  • the periphery of the top surface of the diaphragm is joined to the periphery of the frame opening, and the edge on the side surface side is joined to the inner periphery of the frame.
  • the piston can be vibrated and an electromagnetic transducer with excellent performance can be obtained.
  • FIG. 1 It is a disassembled perspective view which shows the structure of the electromagnetic transducer which concerns on Embodiment 1 of this invention.
  • 2 is a cross-sectional view of the electromagnetic transducer according to Embodiment 1.
  • FIG. 5 is a cross-sectional view for explaining an assembly method for the electromagnetic transducer according to the first embodiment.
  • 3 is a perspective view showing a configuration of a reinforcing structure provided on a diaphragm of the electromagnetic transducer according to Embodiment 1.
  • FIG. 1 is an exploded perspective view showing the configuration of an electromagnetic transducer 10 according to Embodiment 1 of the present invention, and a cross-sectional view thereof is shown in FIG.
  • the electromagnetic transducer 10 shown in the figure includes a magnetic circuit composed of an upper frame 11, a lower frame 12, a permanent magnet 13 and a plate 14, a diaphragm 15, and an upper gasket for holding the diaphragm 15 on the upper side of the magnetic circuit. 16 and an edge 17 and a second support portion including a lower gasket 18 and a damper 19 for holding the diaphragm 15 inside the magnetic circuit.
  • the upper and lower sides are distinguished for the sake of explanation, but in practice, any surface may be on the upper side.
  • the lower frame 12 fixes one magnetic pole surface of the permanent magnet 13, and the upper frame 11 covers the lower frame 12 together with the permanent magnet 13, and is opened at substantially the same height as the other magnetic pole surface of the permanent magnet 13. 11a.
  • a plate 14 is bonded on the other magnetic pole surface of the permanent magnet 13. Therefore, the plate 14 and the opening 11a are at substantially the same height, and the magnetic flux density between the plate 14 and the opening 11a is increased.
  • a thermoplastic resin sheet such as PEI (polyetherimide), PEN (polyethylene naphthalate), PET, PEEK (polyetheretherketone) is used.
  • the voice coil pattern 15g is formed by edging the conductor foil at positions corresponding to the top surface 15a and the side surfaces 15b, 15c in the longitudinal direction on one or both sides of the thermoplastic resin sheet before three-dimensional molding, To make a three-dimensional structure.
  • the rigidity of the diaphragm 15 can be improved by forming the four sides of the diaphragm 15 into the four side surfaces 15b to 15e depending from the top surface 15a by hot press molding.
  • the side surfaces 15b and 15c in the longitudinal direction are formed in a shape that hangs vertically from the top surface 15a, and the side surfaces 15d and 15e in the short direction are formed in a shape that hangs obliquely from the top surface 15a. Since the side surfaces 15b and 15c in the longitudinal direction on which the voice coil pattern 15g is formed can be formed without stretching the thermoplastic resin sheet at the time of hot press molding, there is no fear of breakage due to a difference in elongation rate. Further, a flange portion 15f is formed on the tip side of the side surfaces 15b to 15e. The flange portion 15 f serves as a fixing margin when the diaphragm 15 is bonded to the damper 19.
  • the periphery of the opening 17 a of the edge 17 is joined to the periphery of the top surface 15 a of the diaphragm 15, and the outer periphery of the edge 17 is joined to the periphery of the opening 16 a of the upper gasket 16.
  • the upper gasket 16 is fixed to the upper surface of the upper frame 11.
  • the upper gasket 16 and the edge 17 serve as a first support portion, and support the diaphragm 15 so as to be vertically movable. Note that the outer peripheral edge of the edge 17 may be directly joined to the upper frame 11 without using the upper gasket 16.
  • a part of the upper surface of the upper frame 11 May be projected upward to align the height, or the outer peripheral edge of the edge 17 may be extended to the upper surface of the upper frame 11.
  • the peripheral edge of the opening 19a of the damper 19 is joined to the flange 15f at the peripheral edge of the side surface of the diaphragm 15, and the outer periphery of the damper 19 is joined to the peripheral edge of the opening 18a of the lower gasket 18.
  • the lower gasket 18 is fixed to the upper back surface of the upper frame 11, that is, inside the magnetic circuit.
  • the lower gasket 18 and the damper 19 serve as a second support portion, and support the diaphragm 15 so as to be vertically displaced. Note that the outer peripheral edge of the damper 19 may be directly joined to the inside of the upper frame 11 without using the lower gasket 18.
  • the operation principle of the electromagnetic transducer 10 will be described.
  • a current (audio signal) is supplied to the voice coil pattern 15g from the outside
  • the current flowing through the voice coil pattern 15g and the magnetic flux generated between the opening 11a of the upper frame 11 and the plate 14 are electromagnetically coupled.
  • a driving force is generated according to Fleming's law. Due to the generated driving force, the diaphragm 15 causes the piston to vibrate in the vertical direction, thereby generating sound waves. Since the entire circumference of the top surface 15a and the entire circumference of the flange portion 15f of the diaphragm 15 are supported by the first and second support portions so as to be vertically displaceable, piston vibration that moves in parallel up and down may be disturbed even at large amplitudes. Absent. Therefore, the magnetic gap defect due to rolling does not occur. Further, the diaphragm 15 does not collide with the permanent magnet 13 and the plate 14, and no hitting sound is generated.
  • FIG. 3 is a cross-sectional view for explaining an assembling method of the electromagnetic transducer 10 according to the first embodiment.
  • the diaphragm 15, the lower gasket 18, and the damper 19 are first joined to assemble the diaphragm ASSY.
  • an adhesive 20 is applied to the upper back surface of the upper frame 11, and the diaphragm ASSY and the upper frame 11 are bonded using the outer periphery of the lower gasket 18 as a guide.
  • the diaphragm ASSY to which the upper frame 11 is bonded is attached to the jig 21 and fixed in position as shown in FIG.
  • the upper gasket 16 and the edge 17 are joined to assemble the edge ASSY.
  • the adhesive 22 is applied to the periphery of the opening of the edge 17, and the adhesive 23 is applied to the upper surface of the upper frame 11 to bond the edge ASSY and the diaphragm ASSY.
  • the lower frame 12, the permanent magnet 13 and the plate 14 are bonded to assemble the magnet ASSY, and the upper frame 11 and the lower frame 12 are connected with screws or an adhesive or the like. It joins and the assembly of the electromagnetic transducer 10 is completed.
  • the electromagnetic transducer 10 includes the permanent magnet 13, the lower frame 12 that fixes one magnetic pole surface of the permanent magnet 13, and the upper frame in which the opening 11a is formed on the other magnetic pole side. 11 and the magnetic circuit composed of the plate 14 fixed to the other magnetic pole surface, the top surface 15a at a position covering the plate 14, and the plate 14 and the upper frame 11 formed from the top surface 15a toward the permanent magnet 13
  • the diaphragm 15 having four side surfaces 15b to 15e positioned between the openings 11a and having the voice coil pattern 15g formed thereon, the upper gasket 16 adhered to the periphery of the opening 11a of the upper frame 11, and the top surface of the diaphragm 15
  • An edge 17 that is joined to the peripheral edge of 15a and the peripheral edge of the opening 16a of the upper gasket 16 to hold the diaphragm 15 in a displaceable manner, and an inner peripheral surface of the upper frame 11
  • a lower gasket 18 which adheres, joined to the opening 18a peripheral edge of the flange
  • the vibration plate 15 can be supported by a double support structure having a small number of parts and can be caused to vibrate the piston, thereby preventing abnormal noise. Further, it is not necessary to divide the magnetic circuit as in the conventional case, and the number of parts is not increased and the cost is not increased. Further, since it is not necessary to divide and arrange the magnetic circuit, the magnetic flux density does not vary and the magnetic flux density does not decrease.
  • the diaphragm 15 has four side surfaces 15b to 15e formed by hot press-molding both side ends in the longitudinal direction and both side ends in the short direction of the thermoplastic resin sheet.
  • the coil pattern 15g is arranged on the side surfaces 15b and 15c and the top surface 15a in the longitudinal direction. For this reason, not a high-cost thermosetting resin but a low-cost thermoplastic resin can be used, and as a result, an inexpensive electromagnetic transducer 10 can be obtained.
  • FIG. 4 is a perspective view showing a configuration of a reinforcing structure 15h provided on the diaphragm 15 according to the first embodiment.
  • the reinforcing structure 15h may be realized by a rib structure or a concavo-convex structure, and the rib or concavo-convex direction may be the longitudinal direction or the short direction of the diaphragm 15 as shown in FIG.
  • the method of forming the voice coil pattern 15g by edging before the diaphragm 15 is hot press-molded has been described.
  • the present invention is not limited to this, and the diaphragm 15 before three-dimensional molding is used.
  • the voice coil pattern 15g may be printed and formed, or the voice coil pattern 15g may be formed by attaching a coil to the diaphragm 15 after three-dimensional molding.
  • the electromagnetic transducer according to the present invention can be used for an electromagnetic transducer that reproduces sound from an audio signal by combining a permanent magnet and a diaphragm because it can prevent generation of abnormal noise, increase in the number of parts, and decrease in magnetic flux density. Suitable for

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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)
  • Diaphragms For Electromechanical Transducers (AREA)
PCT/JP2009/005701 2009-07-13 2009-10-28 電磁変換器 WO2011007403A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN200980122480.6A CN102067630B (zh) 2009-07-13 2009-10-28 电磁转换器
KR1020107028525A KR101064071B1 (ko) 2009-07-13 2009-10-28 전자 변환기

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009164795A JP4545222B1 (ja) 2009-07-13 2009-07-13 電磁変換器
JP2009-164795 2009-07-13

Publications (1)

Publication Number Publication Date
WO2011007403A1 true WO2011007403A1 (ja) 2011-01-20

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ID=42824813

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2009/005701 WO2011007403A1 (ja) 2009-07-13 2009-10-28 電磁変換器

Country Status (4)

Country Link
JP (1) JP4545222B1 (ko)
KR (1) KR101064071B1 (ko)
CN (1) CN102067630B (ko)
WO (1) WO2011007403A1 (ko)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016032703A1 (en) * 2014-08-25 2016-03-03 Apple Inc. High aspect ratio microspeaker having a two-plane suspension
CN108600932A (zh) * 2018-03-29 2018-09-28 山东共达电声股份有限公司 动圈结构及其制作方法及扬声器
US10291990B2 (en) 2016-10-26 2019-05-14 Apple Inc. Unibody diaphragm and former for a speaker
US10321235B2 (en) 2016-09-23 2019-06-11 Apple Inc. Transducer having a conductive suspension member
US10555085B2 (en) 2017-06-16 2020-02-04 Apple Inc. High aspect ratio moving coil transducer
US11381921B2 (en) 2018-10-30 2022-07-05 Sound Solutions International Co., Ltd. Electrodynamic acoustic transducer with improved suspension system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5328691B2 (ja) * 2010-02-22 2013-10-30 三菱電機エンジニアリング株式会社 電磁変換器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5797297A (en) * 1980-12-09 1982-06-16 Sanyo Electric Co Ltd Thin type speaker
JP2000032586A (ja) * 1998-07-07 2000-01-28 Victor Co Of Japan Ltd 電気音響変換器
JP2002152881A (ja) * 2000-11-08 2002-05-24 Matsushita Electric Ind Co Ltd スピーカ
WO2009101813A1 (ja) * 2008-02-14 2009-08-20 Panasonic Corporation スピーカ、及び電子機器

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4983424A (en) * 1989-08-04 1991-01-08 Nordson Corporation Method for forming a permanent foam coating by atomization onto a substrate
JP3846063B2 (ja) 1998-09-28 2006-11-15 松下電器産業株式会社 スピーカ
DE19954880C1 (de) * 1999-11-15 2001-01-25 Siemens Audiologische Technik Elektromagnetischer Wandler zur Schallerzeugung in Hörhilfen, insbesondere miniaturisierten elektronischen Hörgeräten
JP2008113368A (ja) 2006-10-31 2008-05-15 Fps:Kk 平面型音響変換装置及び平面型音響変換装置の製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5797297A (en) * 1980-12-09 1982-06-16 Sanyo Electric Co Ltd Thin type speaker
JP2000032586A (ja) * 1998-07-07 2000-01-28 Victor Co Of Japan Ltd 電気音響変換器
JP2002152881A (ja) * 2000-11-08 2002-05-24 Matsushita Electric Ind Co Ltd スピーカ
WO2009101813A1 (ja) * 2008-02-14 2009-08-20 Panasonic Corporation スピーカ、及び電子機器

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016032703A1 (en) * 2014-08-25 2016-03-03 Apple Inc. High aspect ratio microspeaker having a two-plane suspension
US9712921B2 (en) 2014-08-25 2017-07-18 Apple Inc. High aspect ratio microspeaker having a two-plane suspension
US10321235B2 (en) 2016-09-23 2019-06-11 Apple Inc. Transducer having a conductive suspension member
US10911874B2 (en) 2016-09-23 2021-02-02 Apple Inc. Transducer having a conductive suspension member
US10291990B2 (en) 2016-10-26 2019-05-14 Apple Inc. Unibody diaphragm and former for a speaker
US10555085B2 (en) 2017-06-16 2020-02-04 Apple Inc. High aspect ratio moving coil transducer
CN108600932A (zh) * 2018-03-29 2018-09-28 山东共达电声股份有限公司 动圈结构及其制作方法及扬声器
CN108600932B (zh) * 2018-03-29 2023-12-08 山东共达电声股份有限公司 动圈及其制作方法及扬声器
US11381921B2 (en) 2018-10-30 2022-07-05 Sound Solutions International Co., Ltd. Electrodynamic acoustic transducer with improved suspension system

Also Published As

Publication number Publication date
CN102067630B (zh) 2014-06-11
KR101064071B1 (ko) 2011-09-08
CN102067630A (zh) 2011-05-18
KR20110015015A (ko) 2011-02-14
JP2011023810A (ja) 2011-02-03
JP4545222B1 (ja) 2010-09-15

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