EP2131607A2 - Haut-parleur - Google Patents

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Publication number
EP2131607A2
EP2131607A2 EP09161139A EP09161139A EP2131607A2 EP 2131607 A2 EP2131607 A2 EP 2131607A2 EP 09161139 A EP09161139 A EP 09161139A EP 09161139 A EP09161139 A EP 09161139A EP 2131607 A2 EP2131607 A2 EP 2131607A2
Authority
EP
European Patent Office
Prior art keywords
plastic magnet
yoke
magnetic circuit
speaker
voice coil
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP09161139A
Other languages
German (de)
English (en)
Inventor
Hideo Yuasa
Tomohiko Kamimura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hosiden Corp
Original Assignee
Hosiden Corp
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 Hosiden Corp filed Critical Hosiden Corp
Publication of EP2131607A2 publication Critical patent/EP2131607A2/fr
Withdrawn legal-status Critical Current

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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
    • H04R9/025—Magnetic circuit
    • 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
    • H04R9/10—Telephone receivers

Definitions

  • the present invention relates to a small and thin speaker which can be used in a portable telephone or the like.
  • a speaker which uses a plastic magnet in a magnetic circuit
  • Patent Literature 1 a speaker which uses a plastic magnet in a magnetic circuit
  • the component configuration and assembling of the magnetic circuit of such a speaker are identical with those of a speaker which uses a usual metal (ferrite, alnico, rear earth, or the like) magnet.
  • a magnetic circuit is assembled by bonding together three components, or a magnet, a yoke, and a pole piece.
  • Patent Literature 1 Japanese Patent Application Laying-Open No. 2000-32589
  • a conventional speaker has a problem in that an adhesive agent which is used in the assembling of a magnetic circuit exerts a very large influence, and hence the mass productivity is hardly enhanced.
  • the invention has been conducted in view of the problem. It is an object of the invention to provide a small and thin speaker which uses the characteristics of a plastic magnet that it can be easily processed into a desired shape, and which therefore has a high mass productivity.
  • the speaker of the invention is a speaker comprising: a magnetic circuit; a vibration system in which a diaphragm is attached to a voice coil; and a frame which supports the magnetic circuit and the vibration system, the voice coil being placed in a magnetic gap, wherein the magnetic circuit is configured by: a plastic magnet having a T-like section shape; and a yoke which is continuously disposed in a bottom portion side and periphery of the plastic magnet.
  • the magnet itself plays a role of a pole piece.
  • the magnet which occupies a smaller space, and which has a larger volume can be used.
  • the magnetic circuit which conventionally has the three-piece structure, is configured by a two-piece structure, i.e., the number of components is reduced while the driving force of the voice coil is enhanced.
  • a top face of the plastic magnet is formed as a concave face, and a middle portion of the diaphragm is formed into an inverted dome-like shape.
  • a tubular portion which is raised from the yoke on the bottom portion side of the plastic magnet, by a burling process, and a through hole through which the tubular portion is to be passed to a center portion of the plastic magnet are disposed, and the plastic magnet is coupled with the yoke by applying a collapsing process on a tip end portion of the tubular portion.
  • the magnetic circuit is configured by: the plastic magnet having a T-like section shape; and the yoke which is continuously disposed in the bottom portion side and periphery of the plastic magnet. Therefore, the number of components of the magnetic circuit, which conventionally has the three-piece structure, is reduced, so that the mass productivity of a small and thin speaker can be enhanced.
  • the top face of the plastic magnet is formed as a concave face, and a middle portion of the diaphragm is formed into an inverted dome-like shape. Therefore, a sufficient amplitude can be ensured in the vibration system, and further thinning of a small and thin speaker can be realized without impairing the acoustic performance.
  • the tubular portion which is raised from the yoke on the bottom portion side of the plastic magnet, by a burling process, and the through hole through which the tubular portion is to be passed to a center portion of the plastic magnet are disposed, and the plastic magnet is coupled with the yoke by applying a collapsing process on a tip end portion of the tubular portion. Therefore, the magnetic circuit can be assembled without using an adhesive agent, and the mass productivity of a small and thin speaker can be further enhanced.
  • a speaker 1 shown in Figs. 1 and 2 is configured by a yoke-integral type frame 2 made of a magnetic material, a magnetic circuit 3, and a vibration system 4.
  • the frame 2 is formed into a low-profile bottomed tubular shape, and has a circular bottom plate 5 and an outer wall 6 which is raised from the outer peripheral edge of the bottom plate 5.
  • a horizontal step face 7 is disposed, and the step face 7 causes the diameter of the upper portion of the outer wall 6 to be larger than that of the lower portion.
  • a yoke sidewall 8 which is an inner wall opposed to the lower portion of the outer wall 6 across a predetermined space is raised from the bottom plate 5.
  • a pair of lead-wire drawn out ports 11 which notch the yoke sidewall 8 to the lower end are disposed in two right and left places of the yoke sidewall 8, respectively.
  • a pair of circular holes 12 for inserting lead-wire forming jigs are disposed in portions of the bottom plate 5 which are at lead-wire drawn out positions on the bottom portion side, and a pair of rear sound holes 13 which are substantially semi-arcuate are disposed in portions of the bottom plate 5 which are in the outer side portion of the bottom plate 5 between the outer wall 6 and the yoke sidewall 8, and which are on the bottom portion side other than the lead-wire drawn out positions.
  • the rear sound hole 13 which is in the upper side in Fig. 2 is opened in the bottom plate 5 continuously with the lower portion of the outer wall 6 and the step face 7.
  • An insulative terminal plate 14 which is substantially semi-arcuate, and in which the inner peripheral edge butts against the yoke sidewall 8 is fixed to the rear side of the step face 7 which is opened by the rear sound hole 13 that is in the upper side in Fig. 2 .
  • a pair of external connection terminals (not shown) are attached to the back face side of the speaker 1 through the terminal plate 14.
  • a pair of lead-wire contact pads 15 which are conductive with the external connection terminals are exposedly formed on the surfaces of both end portions of the terminal plate 14. The lead-wire contact pads 15 are exposed into the frame 2 through the rear sound hole 13 which is in the upper side in Fig. 2 .
  • the magnetic circuit 3 is configured by a plastic magnet 16 and the yoke 10.
  • the plastic magnet 16 is molded into a columnar shape which has a substantially same height as the yoke sidewall 8, and an outer diameter which is slightly smaller than the inner diameter of the yoke sidewall 8.
  • the plastic magnet is concentrically placed on the yoke bottom plate 9, and the upper outer peripheral face of the plastic magnet 16 is opposed to the upper inner peripheral face of the yoke sidewall 8 across a magnetic gap 17.
  • the plastic magnet 16 is molded into a T-like section shape so that the diameter of the upper portion is larger than that of the lower portion. Therefore, the distance of the upper portion of the plastic magnet 16 to the yoke sidewall 8 is shorter than that of the lower portion so that magnetic fluxes are concentrated into the magnetic gap 17. Namely, the upper portion of the plastic magnet 16 plays a role of a pole piece. As compared with a conventional magnetic circuit having the three-piece structure, therefore, the magnet which occupies a smaller space, and which has a larger volume can be used.
  • the magnetic circuit 2, which conventionally has the three-piece structure, is configured by a two-piece structure, i.e., the number of components is reduced while the driving force of a voice coil 21 which will be described later is enhanced.
  • the top face (upper face) of the plastic magnet 16 is not formed as a flat face, but formed as a concave face 18 having an inverted dome-like shape.
  • a circular through hole 19 which vertically passes through the plastic magnet 16 is disposed in a center portion of the plastic magnet.
  • a tubular portion 20 is raised from a center portion of the yoke bottom plate 9 by a burling process.
  • the tubular portion 20 is fitted from the lower side into the through hole 19, a tip end portion of the tubular portion 20 is upward projected from the center portion (deepest portion) of the concave face 18 of the plastic magnet 16, and a collapsing process is applied on the tip end portion of the tubular portion 20, thereby integrally coupling the plastic magnet 16 with the yoke 10.
  • the vibration system 4 is configured by: the voice coil 21 which is formed by winding a conductor wire around a cylindrical voice coil bobbin made of a metal or plastic film; and a circular diaphragm 22 which is made of a metal or plastic film, and which is concentrically bonded to an upper portion of the voice coil 21.
  • the diaphragm 22 is formed into an inverted dome-like shape in which a middle portion of the voice coil 21 that is inside the bonded position is downward inflated, instead of a dome-like shape in which the middle portion is upward inflated.
  • Lead wires 26 which are drawn out from the winding start and end terminals of the voice coil 21 are drawn out to the outside of the yoke 10 through the lead-wire drawn out ports 11, respectively. Then, the lead wires are taken around the rod-like forming jigs which are inserted to the lead-wire drawn out positions through the circular holes 12 from the lower side of the frame 2, to be bent into a substantially U-like shape (forming), and guided to the lead-wire contact pads 15 to which the lead wires are to be connected. Thereafter, the tip ends of the lead wires 26 are spot-welded to the lead-wire contact pads 15 to which the lead wires are to be connected.
  • the interaction between the magnetic field generated in the magnetic circuit 3 and the current flowing through the voice coil 21 causes the voice coil 21 to vertically vibrate, and, in accordance with this, the diaphragm 22 is vertically vibrated to cause the surrounding air to vibrate, thereby generating a sound.
  • the magnetic circuit 3 is configured by the plastic magnet 16 having a T-like section shape, and the yoke 10 which is continuously disposed in the bottom portion side and periphery of the plastic magnet 16, and therefore the number of components of the magnetic circuit, which conventionally has the three-piece structure, is reduced, whereby the mass productivity of a small and thin speaker can be enhanced.
  • the top face of the plastic magnet 16 is formed as the concave face 18, and the middle portion of the diaphragm 22 is formed into the inverted dome-like shape. Therefore, a sufficient amplitude can be ensured in the vibration system 4, and further thinning of a small and thin speaker can be realized without impairing the acoustic performance.
  • the tubular portion 20 which is raised from the yoke 10 on the bottom portion side of the plastic magnet 16, by a burling process, and the through hole 19 through which the tubular portion 20 is to be passed to the center portion of the plastic magnet 16 are disposed, and the plastic magnet 16 is coupled with the yoke 10 by applying a collapsing process on the tip end portion of the tubular portion 20. Therefore, the magnetic circuit 3 can be assembled without using an adhesive agent, and the mass productivity of a small and thin speaker can be further enhanced.
  • the speaker of the invention may be of the square type.
  • the invention is not restricted to the embodiment, and may be variously modified without departing the spirit of the invention.

Landscapes

  • 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)
EP09161139A 2008-06-03 2009-05-26 Haut-parleur Withdrawn EP2131607A2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2008146061A JP2009296160A (ja) 2008-06-03 2008-06-03 スピーカ

Publications (1)

Publication Number Publication Date
EP2131607A2 true EP2131607A2 (fr) 2009-12-09

Family

ID=41050983

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09161139A Withdrawn EP2131607A2 (fr) 2008-06-03 2009-05-26 Haut-parleur

Country Status (5)

Country Link
EP (1) EP2131607A2 (fr)
JP (1) JP2009296160A (fr)
KR (1) KR20090126193A (fr)
CN (1) CN101600137A (fr)
TW (1) TW201004392A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2830328A4 (fr) * 2012-03-19 2015-10-28 Sony Corp Circuit de commande de casque d'écoute, haut-parleur, et procédé pour la fabrication d'un circuit de commande de casque d'écoute ou d'un haut-parleur
CN112954551A (zh) * 2021-03-04 2021-06-11 珠海惠威科技有限公司 一种扬声器

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4997173B2 (ja) * 2008-05-13 2012-08-08 ホシデン株式会社 電気音響変換器
CN101682818B (zh) * 2008-05-13 2013-05-15 星电株式会社 电声转换器
JP5273315B2 (ja) * 2010-10-13 2013-08-28 パナソニック株式会社 スピーカ用磁気回路およびこれを用いたスピーカ
JP2013115678A (ja) * 2011-11-30 2013-06-10 Foster Electric Co Ltd マイクロスピーカ用磁気回路
KR101433637B1 (ko) 2013-04-23 2014-08-25 동아대학교 산학협력단 스피커의 구조
KR101313824B1 (ko) 2013-07-24 2013-10-01 김송희 스피커모듈의 조립품 및 이를 포함하는 스피커
CN103856874B (zh) * 2014-03-05 2018-09-18 歌尔股份有限公司 扬声器振动系统
KR102321465B1 (ko) * 2015-06-17 2021-11-03 삼성전자 주식회사 스피커유닛 및 이를 가지는 음성출력장치
JP2018050141A (ja) * 2016-09-21 2018-03-29 カシオ計算機株式会社 音響装置
CN107820178A (zh) * 2017-11-24 2018-03-20 苏州逸巛声学科技有限公司 一种受话器

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000032589A (ja) 1998-07-10 2000-01-28 Sony Corp スピーカ

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000032589A (ja) 1998-07-10 2000-01-28 Sony Corp スピーカ

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2830328A4 (fr) * 2012-03-19 2015-10-28 Sony Corp Circuit de commande de casque d'écoute, haut-parleur, et procédé pour la fabrication d'un circuit de commande de casque d'écoute ou d'un haut-parleur
CN112954551A (zh) * 2021-03-04 2021-06-11 珠海惠威科技有限公司 一种扬声器
CN112954551B (zh) * 2021-03-04 2022-12-13 珠海惠威科技有限公司 一种扬声器

Also Published As

Publication number Publication date
TW201004392A (en) 2010-01-16
KR20090126193A (ko) 2009-12-08
JP2009296160A (ja) 2009-12-17
CN101600137A (zh) 2009-12-09

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