EP1841280A1 - Membrane de haut-parleur - Google Patents

Membrane de haut-parleur Download PDF

Info

Publication number
EP1841280A1
EP1841280A1 EP06300298A EP06300298A EP1841280A1 EP 1841280 A1 EP1841280 A1 EP 1841280A1 EP 06300298 A EP06300298 A EP 06300298A EP 06300298 A EP06300298 A EP 06300298A EP 1841280 A1 EP1841280 A1 EP 1841280A1
Authority
EP
European Patent Office
Prior art keywords
diaphragm
lower flat
skins
enhancement core
loudspeaker diaphragm
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Withdrawn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
EP06300298A
Other languages
German (de)
English (en)
Inventor
Sung Yeon Kim
Ronald Chiu
Eng Choon Low
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.)
Thomson Licensing SAS
Original Assignee
Thomson Licensing SAS
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 Thomson Licensing SAS filed Critical Thomson Licensing SAS
Priority to EP06300298A priority Critical patent/EP1841280A1/fr
Publication of EP1841280A1 publication Critical patent/EP1841280A1/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Withdrawn legal-status Critical Current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
    • H04R7/10—Plane diaphragms comprising a plurality of sections or layers comprising superposed layers in contact
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
    • H04R31/006—Interconnection of transducer parts

Definitions

  • the present invention relates to a field of loudspeaker, and more particularly to a flat loudspeaker diaphragm structure having an enhancement core sandwiched between outer skins.
  • a common loudspeaker generally includes a conical diaphragm typically manufactured of paper or plastic, and a dust cap usually provided at the central area of the conical diaphragm.
  • the conical diaphragm can not efficiently overcome inertia forces, and begins to vibrate not as a rigid body, but rather in parts, causing corresponding increased distortion in reproduced sound.
  • the conical form of the diaphragm causes sound to reach a point at different times (the "cavity effect").
  • Figs. 4-5 show a flat diaphragm 20.
  • the flat diaphragm may have many break modes, e.g. many huge dips 201 and peaks 202 on the flat diaphragm 20, which occur distortion and poor treble.
  • a sandwiched flat diaphragm structure as disclosed in US Pat. No. 6,097,829 , includes two sheets of flat skins 30 and a honey-comb core 31 sandwiched between the flat skins by glue or the like.
  • the flat skins are made of carbon fibre, and the honey-comb core is made of aramid (or nomex).
  • the afore mentioned sandwiched diaphragm structure have enough rigidity to mitigate sound distortion. Furthermore, because the skins are flat, the unwanted "cavity effect" is eliminated.
  • the honey-comb diaphragm structure has a heavy mass, so it needs a strong and huge driving motor (magnet).
  • the skins and honey-comb core may be partially separated to occur buzz sound.
  • manufacturing the honey-comb diaphragm structure is difficult.
  • another sandwiched loudspeaker diaphragm is composed of two flat skins 40 and a rectangular core 41.
  • the rectangular core 41 may have a transversal movement along with the flat skins 40 to occur harmonic distortion.
  • the vertical force will cause a spring back effect (expansion and contraction) on the diaphragm in the operation mode, as shown in Fig. 11, the sound reproduced by the diaphragm is distorted.
  • the present invention provides a loudspeaker diaphragm which is lightweight and easily manufactured whereas with sufficient rigidity, and capable of resisting transversal and vertical movement so as to reduce break modes and eliminate sound distortion.
  • the present invention provides a loudspeaker diaphragm comprising an upper flat skin and a lower flat skin that are substantially parallel to a transversal axis, and an enhancement core sandwiched between the upper and lower flat skins, characterized in that the enhancement core is composed of multiple ribs extending in different inclined angles alternately between the upper and lower flat skins.
  • the inclined angle of one rib relative to the transversal axis is supplementary to the inclined angle of an adjacent rib relative to the transversal axis.
  • the multiple ribs of the enhancement core are arranged in a configuration with a triangle-shaped or trapezoid-shaped cross section including a series of triangles or trapezoids between the upper and lower flat skins, whereby the transversal movement or vertical movement, e.g. the spring back effect (expansion and contraction), applying on the diaphragm are resisted.
  • the inventive loudspeaker diaphragm is light weight with sufficient rigidity, and less break modes is achieved so as to mitigate the sound distortion.
  • the multiple ribs of the enhancement core are integrally formed with the upper and lower flat skins. Therefore it can be advantageously manufactured integrally, so as to reduce the manufacturing cost.
  • the present invention relates to a loudspeaker diaphragm having an enhancement core sandwiched between outer skins.
  • a loudspeaker diaphragm in accordance with the present invention includes an upper flat skin 11 and a lower flat skin 12 that are extending substantially parallel to a transversal axis 10, and an enhancement core 13 sandwiched between the upper flat skin 11 and the lower flat skin 12.
  • the enhancement core 13 is composed of multiple ribs extending in different inclined angles alternately between the upper flat skin 11 and the lower flat skin 12.
  • the multiple ribs of the enhancement core 13 are connected one by one so as to form a triangle-shaped cross section including a series of triangles between the upper and lower skins 11, 12.
  • angle A of one rib 131 relative to the transversal axis 10 is supplementary to angle B of an adjacent rib 132 relative to the transversal axis 10, that is to say, the two inclined angles A and B of the two adjacent ribs 131, 132 are supplementary to the each other. Therefore, the loudspeaker diaphragm having the multiple ribs extending in different inclined angles alternately between the upper and lower flat skins 11, 12 and integrally formed with the upper and lower flat skins 11, 12 is capable of resisting both transversal and vertical waves existing during the sound reproducing.
  • a loudspeaker diaphragm is formed in a similar configuration as the first embodiment shown in Fig.1, wherein an enhancement core 14 is sandwiched between the upper flat skin 11 and the lower flat skin 12 that are parallel to the transversal axis 10.
  • the enhancement core 14 is similarly composed of multiple ribs extending in different inclined angles alternately between the flat skins 11, 12.
  • the enhancement core 14 is formed with a configuration that the multiple ribs are discrete so as to form a trapezoid-shaped cross section including a series of trapezoids.
  • the inclined angles of each two adjacent ribs of the enhancement core 14 are supplementary to the each other.
  • the inventive loudspeaker diaphragm with the triangle-shaped or trapezoid-shape enhancement core 13, 14 is capable of providing resistance against the transversal movement or vertical movement, e.g. the spring back effect (expansion and contraction) applying on the diaphragm, thus less break modes are achievable, and therefore sound distortion reproduced by the diaphragm is mitigated.
  • the inventive loudspeaker diaphragm with the enhancement core 13, 14 sandwiched in the outer skins 11, 12 have a light weight whereas with a sufficient rigidity, the speaker can use a small drive unit (magnet) for reproducing sound.
  • the enhancement core 13, 14 of the loudspeaker diaphragm is integrated with the outer skins 11, 12, it will not separate from the upper and lower skins 11, 12, no buzz sound will occur in the sound reproducing.
  • the manufacture of the diaphragm is advantageously easy and the manufacture cost is reduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Manufacturing & Machinery (AREA)
  • Multimedia (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
EP06300298A 2006-03-29 2006-03-29 Membrane de haut-parleur Withdrawn EP1841280A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06300298A EP1841280A1 (fr) 2006-03-29 2006-03-29 Membrane de haut-parleur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06300298A EP1841280A1 (fr) 2006-03-29 2006-03-29 Membrane de haut-parleur

Publications (1)

Publication Number Publication Date
EP1841280A1 true EP1841280A1 (fr) 2007-10-03

Family

ID=36968979

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06300298A Withdrawn EP1841280A1 (fr) 2006-03-29 2006-03-29 Membrane de haut-parleur

Country Status (1)

Country Link
EP (1) EP1841280A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2479941A (en) * 2010-04-30 2011-11-02 Gp Acoustics Stiffened loudspeaker diaphragm

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5690695A (en) * 1979-12-24 1981-07-22 Victor Co Of Japan Ltd Speaker diaphragm and its manufacture
JPS58182996A (ja) * 1982-04-20 1983-10-26 Matsushita Electric Ind Co Ltd スピ−カ用振動板
JPS5916494A (ja) * 1982-07-19 1984-01-27 Matsushita Electric Ind Co Ltd スピ−カ用振動板
JPS59152796A (ja) * 1983-02-18 1984-08-31 Matsushita Electric Ind Co Ltd スピ−カ用振動板
JPS59205899A (ja) * 1983-05-09 1984-11-21 Matsushita Electric Ind Co Ltd スピーカ用振動板の製造方法
JPS60177797A (ja) * 1984-02-23 1985-09-11 Matsushita Electric Ind Co Ltd スピ−カ用振動板

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5690695A (en) * 1979-12-24 1981-07-22 Victor Co Of Japan Ltd Speaker diaphragm and its manufacture
JPS58182996A (ja) * 1982-04-20 1983-10-26 Matsushita Electric Ind Co Ltd スピ−カ用振動板
JPS5916494A (ja) * 1982-07-19 1984-01-27 Matsushita Electric Ind Co Ltd スピ−カ用振動板
JPS59152796A (ja) * 1983-02-18 1984-08-31 Matsushita Electric Ind Co Ltd スピ−カ用振動板
JPS59205899A (ja) * 1983-05-09 1984-11-21 Matsushita Electric Ind Co Ltd スピーカ用振動板の製造方法
JPS60177797A (ja) * 1984-02-23 1985-09-11 Matsushita Electric Ind Co Ltd スピ−カ用振動板

Non-Patent Citations (6)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 005, no. 163 (E - 078) 20 October 1981 (1981-10-20) *
PATENT ABSTRACTS OF JAPAN vol. 008, no. 021 (E - 224) 28 January 1984 (1984-01-28) *
PATENT ABSTRACTS OF JAPAN vol. 008, no. 099 (E - 243) 10 May 1984 (1984-05-10) *
PATENT ABSTRACTS OF JAPAN vol. 009, no. 004 (E - 288) 10 January 1985 (1985-01-10) *
PATENT ABSTRACTS OF JAPAN vol. 009, no. 069 (E - 305) 29 March 1985 (1985-03-29) *
PATENT ABSTRACTS OF JAPAN vol. 010, no. 016 (E - 375) 22 January 1986 (1986-01-22) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2479941A (en) * 2010-04-30 2011-11-02 Gp Acoustics Stiffened loudspeaker diaphragm
US8942407B2 (en) 2010-04-30 2015-01-27 Gp Acoustics (Uk) Limited Loudspeaker and diaphragm therefor

Similar Documents

Publication Publication Date Title
US4291205A (en) Laminated loudspeaker diaphragm with honeycomb core and damping layers
JP4404780B2 (ja) スピーカ
CN102959984B (zh) 扬声器及其振动膜
US8019108B2 (en) Speaker system
CZ20022498A3 (cs) Měnič
KR19990044068A (ko) 패널형 마이크로폰
JPH11512248A (ja) グリーティング等のカード
JP6275297B1 (ja) 音響装置
TWI596949B (zh) 揚聲器結構
JP2008124738A (ja) スピーカ装置
EP1797741B1 (fr) Haut-parleur comprenant une membrane acoustique
EP1841280A1 (fr) Membrane de haut-parleur
DE112016000712T5 (de) Elektrodynamischer Transducer in Ultraschallmodus
EP2192792A1 (fr) Plaque vibrante et haut-parleur
EP3588977B1 (fr) Cône vibrant faisant office de haut-parleur et haut-parleur
US20040146176A1 (en) Paper-honeycomb-paper sandwich multi-layer loudspeaker cone structure
JPH09275598A (ja) スピーカ用センターリングスパイダ及びこれを用いたスピーカ
EP3435687A1 (fr) Haut-parleur et procédé de fabrication de haut-parleur
JPH0129360B2 (fr)
CN112492460B (zh) 扬声器
JPS5831696A (ja) スピ−カ用平面振動板
JPH0212797Y2 (fr)
CN102106159A (zh) 声学换能器的薄膜
WO2009129815A1 (fr) Ensemble membrane bicône et multicône
FR2565058A1 (fr) Diaphragme de haut-parleur

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): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK YU

AKX Designation fees paid
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: 20080404

REG Reference to a national code

Ref country code: DE

Ref legal event code: 8566