EP1100287A1 - Haut-parleur - Google Patents

Haut-parleur Download PDF

Info

Publication number
EP1100287A1
EP1100287A1 EP99402807A EP99402807A EP1100287A1 EP 1100287 A1 EP1100287 A1 EP 1100287A1 EP 99402807 A EP99402807 A EP 99402807A EP 99402807 A EP99402807 A EP 99402807A EP 1100287 A1 EP1100287 A1 EP 1100287A1
Authority
EP
European Patent Office
Prior art keywords
diaphragm
loudspeaker
voice coil
driver unit
panel
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Withdrawn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
EP99402807A
Other languages
German (de)
English (en)
Inventor
Wah Yung c/o M-Tech(HK) Co. Ltd Tsoi
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.)
M- Tech(HK) Co Ltd
Original Assignee
M- Tech(HK) Co Ltd
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 M- Tech(HK) Co Ltd filed Critical M- Tech(HK) Co Ltd
Priority to EP99402807A priority Critical patent/EP1100287A1/fr
Publication of EP1100287A1 publication Critical patent/EP1100287A1/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • H04R7/06—Plane diaphragms comprising a plurality of sections or layers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
    • H04R2307/029—Diaphragms comprising fibres

Definitions

  • This invention relates to loudspeakers, and is applicable particularly on multi media and all speakers related applications, including hi fi system, television and car stereo.
  • a loudspeaker includes a planer diaphragm which can be vibrated so as to radiate sound from at least from one face.
  • a driver unit operable by a varying electric current to generate a varying force on this diaphragm.
  • the force varying in a manner related to the varying electric current, characterized by the driver unit being connected to the diaphragm at one or more selected positions or mounted to structure which is in turn connected to the diaphragm at one or more selected positions.
  • the diaphragm should have a bending strength in a single plans along a first axis which is greater than along a second axis which is perpendicular to the first axis.
  • the material of the diaphragm has a bending strength in one direction of the plane of the material which is significantly greater than the bending strength along a line in the plane of the material at right angles to the first direction.
  • Preferably it has a longitudinal bending strength which is more than twice of its transverse bending strength, which is particularly suitable to panels which are rectangular or elliptical.
  • the loudspeaker includes a frame having at least one face, said the diaphragm extending right across the face and perhaps a rear diaphragm extending right across the rear face whereby the interior space of the loudspeaker is substantially enclosed.
  • the driver unit is located remote from the frame.
  • the driver unit is located outside from the frame.
  • the driver unit is connected to the diaphragm whereby the driver unit will apply varying force, corresponding to the varying electric current and cause the diaphragm to flex and emit an acoustic signal from the face of the diaphragm exterior of the loudspeaker.
  • the diaphragm should be flexible and the diver operates the diaphragm in polar mode.
  • the driver unit is mounted to the diaphragm at said one or more selected positions which is remote from the peripheral edge of the diaphragm.
  • the diaphragm may be of double skinned polypropylene copolymer, and may be approximately 3mm thick.
  • the surface of each diaphragm is treated with a corona discharge to assist adhesion of paint etc, or of the diaphragm to the frame.
  • each diaphragm is approximately 600 grams or less per square meter, and may have a tensile strength of around 25 MPa or more and may have a Shore hardness of 60 or more.
  • each diaphragm is slightly fluted or corrugated or slightly curved, so as to provide a modified acoustic performance of the loudspeaker.
  • the interior of the loudspeaker may be a sealed box, with or without one or more ports or vents provided through the frame or through the diaphragm.
  • the diaphragm is made of a sheet of extruded plastics material having integral front and skins joined by closely spaced parallel walls normal to said skins.
  • the diaphragm can also made from different layers of material adhesive together to form a combination of frequency response.
  • the preferable material for this combination is PVC, EVA and EPS.
  • the diaphragm is of double skinned polypropylene co-polymer and the walls are substantially normal to said parallel sheets.
  • the diaphragm is of paper or cardboard, said walls being of substantially corrugated form and being fastened by adhesive to the inner opposing faces of the parallel sheets.
  • Other aspect of development indicate that the sandwich like structure of EVA, EPS and PVC also provide a good material for flat panel.
  • the driver unit includes a magnet, one pole of which is in magnetic continuity with a yoke and the other pole of which is positioned from the yoke by an air gap through which gap a voice coil is operable, the voice coil being attached to drive the diaphragm.
  • a sheet of damping material is connected from a stationary part of the loudspeaker to said part of the diaphragm adjacent the panel or to the panel.
  • the damping material may be cloth.
  • the damping material is porous or perforated so as to allow the passage of air there through.
  • a flat loudspeaker 10 includes a square peripheral frame 11 conveniently made of ABS plastic board. Each external edge of the frame 11 is conveniently 150mm long. The flame is suspended by wire of cords 12 attached to loops or other fasteners 13 at the top of the frame 11.
  • the front of the loudspeaker 10 is covered by a front diaphragm 14 which is attached and sealed around the edges thereof by a suitable adhesive to the front face of the frame 11.
  • the rear of the loudspeaker 10 is covered by a rear panel 15 which are directly connected to the frame 11.
  • the thickness between the front diaphragm and rear panel are 120 millimeters for a 150 millimeters square loudspeaker.
  • a driver unit 16 is positioned adjacent the center of the diaphragms 14.
  • the driver unit is the same as to those used in conventional cone-type loudspeakers and includes a magnet 17, which can be a permanent magnet or an electromagnet, and a voice coil 18.
  • the voice coil 18 carries the usual winding connected by leads 19 to terminals 20 on the rear of the loudspeaker 10.
  • the magnet 17 is fastened, for example, by an adhesive to the interior surface of the rear panel 15 and the voice coil 18 is fastened to the interior surface of the front diaphragm 14.
  • the dimensions of the driver unit 16 and the spacing of the front diaphragm 14 and rear panel 15, are arranged so that the voice coil 18 is in the correct operative position relative to the magnet 17, and properly centered therein.
  • the surface of the diaphragm 14 may be slightly fluted and instead of either diaphragm being flat, it could be corrugated, sandwich like so as to provide a modified acoustic performance of the loudspeaker 10.
  • Figure 3 shows a preferred construction for the front diaphragm 14. It has a sandwich like structure and made from two more layers.
  • the combination of the layer material should have different density and all less than 200 GSM.
  • the total density of the panel should less than 600 GSM.
  • the panel should be around 2 to 5 mm thick.
  • the EVA layer (17) , the EPS layer (18) and PVC layer (19) stick together with adhesive are the best choice.
  • the EVA has the better response to low frequency vibration.
  • the EPC has better performance in middle frequency vibration.
  • the PVC give better result in high.
  • the combination of sandwich like structure give very well result for flat panel.
  • the structure can be modified to have only two layers with this three material.
  • the base layer is the PVC layer and will connect to the voice coil in some way.
  • the face layer will be the combination of EVA and EPS pieces to achieve different sound response.
  • Figure 4 shows a preferred construction for the front diaphragm 14, It comprises an integral extrusion of polyethylene around 3-5mm thick and having front and rear skins 25, 26 joined by continuous longitudinal walls 27 with air spaces there between.
  • the material of the diaphragm 14 is acoustic and has a longitudinal bending strength which may typically be around twice the transverse bending strength.
  • this material is particularly useful in the construction of rectangular loudspeakers, for example those having sides of 200mm x100mm long. Larger or smaller panels can be made using this type of material.
  • Figure 5 shows a loudspeaker having a rigid rear panel 28 of AVB plastic around 3mm thick, with the magnet 17 fastened in the center thereof.
  • the frame 11 holds the front diaphragm 14 at a distance of around 3-5mm from the front face of the panel 28.
  • the voice coil 18 is held in the gap in the magnet 17 by being fastened in a central hole in the diaphragm 14. A hole is made at the center of the diaphragm and fastened to the voice coil 18 by adhesive.
  • the panel 28(shown in figure 6) has an array of gaps 30.
  • the sizes and locations of the gaps 30 are carefully chosen to achieve a smooth frequency response from the loudspeaker 10.
  • a loudspeaker 110 includes a diaphragm 111, to be described later.
  • the outer edge of the diaphragm 111 is connected to plastics dish 112 by adhesive.
  • the dish is provided with a flat 113 on which the diaphragm 111 rests.
  • the cylindrical yoke 117 is located the center portion of the dish 112.
  • the yoke 117 forms part of a magnetic circuit, it is preferably made of low oxygen pure iron which has been annealed slowly in hydrogen.
  • a permanent magnet 118 is held coaxial with the yoke 117 by adhesive.
  • a circular diaphragm 118 is attached to the frame of the yoke. The other end is attached to the diaphragm 111 by adhesive. There is a hole at the center of the diaphragm, the voice coil is secured in this hole by adhesive and a diaphragm 118 are placed on top of the voice coil.
  • a suitable material for the diaphragms 111 is a double skinned sheet made from a polypropylene co-polymer approximately 3 millimeters thick and approximately 600 grams per square matte or less.
  • the diaphragm 111 has a tensile strength of around 23 MPa or more and shore hardness of 60 or more.
  • the material preferably has a corona discharge treated surface to assist adhesion ot paint, wallpaper etc to the diaphragms 111.
  • the diaphragm 111 is preferably a laminate having a core of foam, or has ribs, tubes, corrugated sheet or the like. If it has a foam core it preferable that the foam is not uniform (or the cover sheets are shaped or reinforced). Another alternative is to use a sandwich like structure with a combination of PVC, EVA and EPS layers.
  • the diaphragm 111 may comprise an integral extrusion of polyethylene around 3 to 5mm thick and having front and rear skins 130, 131 joined by continuous longitudinal walls 132 with air spaces in between .
  • the material of the diaphragm 111 has a longitudinal bending strength which may typically be around twice the transverse bending strength.
  • this material is particularly useful in the construction of rectangular loudspeakers, for example those having sides of 200mmx100mm long.
  • FIG 9 shows the possible structure of the voice coil that can be used.
  • the voice coil can be single (linear) or double layer (non-linear) as shown in the figure.
  • Loudspeakers or diaphragms can be made in many different sizes or shapes.
  • One or more drivers may be used depending upon the size of the diaphragm.
  • the loudspeakers may be tuned by porting or by adding weights.
  • the diaphragms can be made of any shape.
  • the material is light weight and stiff but flexible.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
EP99402807A 1999-11-10 1999-11-10 Haut-parleur Withdrawn EP1100287A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99402807A EP1100287A1 (fr) 1999-11-10 1999-11-10 Haut-parleur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP99402807A EP1100287A1 (fr) 1999-11-10 1999-11-10 Haut-parleur

Publications (1)

Publication Number Publication Date
EP1100287A1 true EP1100287A1 (fr) 2001-05-16

Family

ID=8242174

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99402807A Withdrawn EP1100287A1 (fr) 1999-11-10 1999-11-10 Haut-parleur

Country Status (1)

Country Link
EP (1) EP1100287A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2360665B (en) * 1998-06-22 2003-01-15 Slab Technology Ltd Loudspeakers
US8989430B2 (en) 2007-04-26 2015-03-24 Airbus Operations Gmbh Flat speaker
CN111918181A (zh) * 2019-08-08 2020-11-10 阿米那科技有限公司 分布式模式扬声器

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4190746A (en) * 1976-03-19 1980-02-26 Harwood Hugh D Diaphragm material for moving coil loudspeaker, may be laminated or integral with surround
JPS5660193A (en) * 1979-10-22 1981-05-23 Pioneer Electronic Corp Equalizer
JPS5799098A (en) * 1981-10-19 1982-06-19 Matsushita Electric Ind Co Ltd Diaphragm plate for acoustic device
EP0336448A2 (fr) * 1988-04-08 1989-10-11 Matsushita Electric Industrial Co., Ltd. Diaphragme électroacoustique et méthode pour sa fabrication
DE4213991A1 (de) * 1992-04-30 1993-11-04 Ingo Kintzel Prototypenbau Lautsprecher-membrane
JPH07322390A (ja) * 1994-05-26 1995-12-08 Foster Electric Co Ltd 電気音響変換器用振動板およびその製造方法
US5705108A (en) * 1995-10-03 1998-01-06 Foster Electric Co., Ltd. Method for making edge for loudspeaker diaphragm
EP0729289B1 (fr) * 1995-02-23 1998-07-22 Teijin Limited Amortisseur pour un haut-parleur et procédé de sa fabrication
WO1999002012A1 (fr) * 1997-07-03 1999-01-14 New Transducers Limited Haut-parleurs en forme de panneaux
EP0924960A2 (fr) * 1997-12-20 1999-06-23 NOKIA TECHNOLOGY GmbH Suspension pour des arrangements de reproduction sonore selon le principe des ondes de flexion

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4190746A (en) * 1976-03-19 1980-02-26 Harwood Hugh D Diaphragm material for moving coil loudspeaker, may be laminated or integral with surround
JPS5660193A (en) * 1979-10-22 1981-05-23 Pioneer Electronic Corp Equalizer
JPS5799098A (en) * 1981-10-19 1982-06-19 Matsushita Electric Ind Co Ltd Diaphragm plate for acoustic device
EP0336448A2 (fr) * 1988-04-08 1989-10-11 Matsushita Electric Industrial Co., Ltd. Diaphragme électroacoustique et méthode pour sa fabrication
DE4213991A1 (de) * 1992-04-30 1993-11-04 Ingo Kintzel Prototypenbau Lautsprecher-membrane
JPH07322390A (ja) * 1994-05-26 1995-12-08 Foster Electric Co Ltd 電気音響変換器用振動板およびその製造方法
EP0729289B1 (fr) * 1995-02-23 1998-07-22 Teijin Limited Amortisseur pour un haut-parleur et procédé de sa fabrication
US5705108A (en) * 1995-10-03 1998-01-06 Foster Electric Co., Ltd. Method for making edge for loudspeaker diaphragm
WO1999002012A1 (fr) * 1997-07-03 1999-01-14 New Transducers Limited Haut-parleurs en forme de panneaux
EP0924960A2 (fr) * 1997-12-20 1999-06-23 NOKIA TECHNOLOGY GmbH Suspension pour des arrangements de reproduction sonore selon le principe des ondes de flexion

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 4 30 April 1996 (1996-04-30) *
PATENT ABSTRACTS OF JAPAN vol. 5, no. 121 (E - 068) 5 August 1981 (1981-08-05) *
PATENT ABSTRACTS OF JAPAN vol. 6, no. 185 (E - 132) 21 September 1982 (1982-09-21) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2360665B (en) * 1998-06-22 2003-01-15 Slab Technology Ltd Loudspeakers
US8989430B2 (en) 2007-04-26 2015-03-24 Airbus Operations Gmbh Flat speaker
CN111918181A (zh) * 2019-08-08 2020-11-10 阿米那科技有限公司 分布式模式扬声器

Similar Documents

Publication Publication Date Title
US6411723B1 (en) Loudspeakers
US7062064B2 (en) Flat panel loudspeaker arrangement
JP3542136B2 (ja) 慣性振動トランスジューサ
KR100816115B1 (ko) 평면형 스피커
EA002109B1 (ru) Громкоговоритель, содержащий панелеобразный акустический излучающий элемент
EP2140723B1 (fr) Haut-parleur plat
JP3877031B2 (ja) パネル型スピーカ
JP2003125475A (ja) フラットスピーカー
JPH11512254A (ja) パネル式マイクロホン
JPH11512248A (ja) グリーティング等のカード
CN113194390A (zh) 发声装置
CN102082986A (zh) 音圈和使用该音圈的电动式扬声器
JPH11512258A (ja) パネル式ラウドスピーカ
US20080232635A1 (en) Loudspeaker with an Acoustic Membrane
EP1100287A1 (fr) Haut-parleur
MXPA01000037A (es) Altoparlantes.
RU2246802C2 (ru) Громкоговоритель
KR100492945B1 (ko) 스피커
JPH0497700A (ja) 乗物用天井スピーカ
US7035425B2 (en) Frequency response enhancements for electro-dynamic loudspeakers
RU2001102586A (ru) Громкоговоритель
US6590993B2 (en) Panel-shaped loudspeaker
WO2001035698A1 (fr) Haut-parleur plat
TW409483B (en) Loudspeakers
GB2360665A (en) Planar loudspeakers

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

17P Request for examination filed

Effective date: 20010626

AKX Designation fees paid

Free format text: DE FR

17Q First examination report despatched

Effective date: 20020719

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20021130