EP1096830A2 - Transducteur acoustique haute fréquence - Google Patents

Transducteur acoustique haute fréquence Download PDF

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Publication number
EP1096830A2
EP1096830A2 EP00309554A EP00309554A EP1096830A2 EP 1096830 A2 EP1096830 A2 EP 1096830A2 EP 00309554 A EP00309554 A EP 00309554A EP 00309554 A EP00309554 A EP 00309554A EP 1096830 A2 EP1096830 A2 EP 1096830A2
Authority
EP
European Patent Office
Prior art keywords
dome
annular
magnet
skirt
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.)
Ceased
Application number
EP00309554A
Other languages
German (de)
English (en)
Other versions
EP1096830A3 (fr
Inventor
Philip Jeffrey Anthony
Julian Roger Wright
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.)
KEF Audio UK Ltd
Original Assignee
KEF Audio UK 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
Priority claimed from GB9925674A external-priority patent/GB2359213B/en
Application filed by KEF Audio UK Ltd filed Critical KEF Audio UK Ltd
Publication of EP1096830A2 publication Critical patent/EP1096830A2/fr
Publication of EP1096830A3 publication Critical patent/EP1096830A3/fr
Ceased 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; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • H04R7/127—Non-planar diaphragms or cones dome-shaped
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2207/00—Details of diaphragms or cones for electromechanical transducers or their suspension covered by H04R7/00 but not provided for in H04R7/00 or in H04R2307/00
    • H04R2207/021—Diaphragm extensions, not necessarily integrally formed, e.g. skirts, rims, flanges

Definitions

  • This invention relates to a high frequency transducers and a radiating diaphragm therefor.
  • loudspeakers For production of higher audio frequencies, loudspeakers have been used in the art. Loudspeakers used to generate higher audio frequencies have conventionally used a dome type radiating element. Conventionally, vibrating domes used as the radiating element in loudspeakers have been designed as a truncated hemisphere in section, having a tubular section at a periphery, as shown in Figure 1.
  • the dome and the tubular section may be one part or independent units adapted to connect to one another.
  • the tubular section is connected to a moving electromagnetic coil and the diaphragm and the coil are suspended in an air gap created by pole pieces of a permanent magnet and supplied with an electric current that is representative of the sounds to be reproduced.
  • the radiating dome is moved toward or away from a listener. As the dome moves forward, it compresses the air in front of it and as the dome moves backward it rarefies the air in front of it. The compressions and rarefactions result in the sound produced.
  • the breakup at the periphery causes the dome and the voice coil to vibrate in a disordered state and thus produce a high "Q" peak in the frequency response curve.
  • the sound radiated from the high frequency diaphragm dome is ragged and unclear due to deterioration of transmissibility of vibration of the voice coil.
  • a radiating diaphragm for use in a high frequency transducer, comprising: a dome portion and an annular skirt portion extending therefrom; a voice coil connected to said skirt portion; a disc connected to said skirt portion, and a magnet connecting to said disc; and an annular magnet pot receiving said magnet at a side opposing said disc.
  • said dome portion is comprised of a substantially rigid material.
  • said rigid material is a metal.
  • the rigid material is an alloy.
  • said dome portion is of an alloy consisting of at least boron, titanium, and aluminum.
  • said alloy comprises a metal matrix of at least metals and metalloids.
  • said dome has an elliptical configuration.
  • said elliptical configuration is bisected along a major axis thereof.
  • a ratio of said major axis and said minor axis ranges between 1.4 and 2.6 inclusive.
  • a ratio of said major axis and said minor axis is 1.75.
  • said dome portion is integral with said skirt portion.
  • said voice coil is cylindrical in section.
  • said voice coil is directly connected to said skirt at a region of transition from said dome portion to said skirt.
  • a high frequency transducer having a radiating diaphragm, the transducer comprising: a magnet pot having an annular rim at a periphery thereof; a magnet being maintained within said magnet pot to define a channel between said magnet and annular rim; a disc shaped plate being positioned over said magnet within said rim; a dome diaphragm communicating with said plate; an annular spacer connecting to said rim; and an annular surround flexibly connecting to said dome at a first periphery of the annular surround and said annular surround also connecting to said annular spacer at a second periphery of the annular surround.
  • said dome has a skirt extending integrally therefrom.
  • a cylindrical coil is directly connected to said skirt in close proximity to said dome.
  • said dome has a bisected ellipse shape.
  • a high frequency transducer having a radiating diaphragm, the transducer comprising: a magnet pot having an annular wall at a periphery thereof, an annular lip extending medially from a top of said wall; a first magnet being maintained within said magnet pot to define a channel between said magnet and annular wall; a disc shaped plate being positioned over said magnet on a similar plane as said annular lip; an elliptical dome diaphragm having an integral skirt extending therefrom, said skirt attaching to said plate, and said dome consisting of a material selected from at least a metal, an alloy, and a metalloid; an annular spacer connecting to said wall; and an annular surround flexibly connecting to said dome at a periphery thereof, and said annular surround also connecting to said annular spacer.
  • the high frequency transducer is an element that is incorporated into a loudspeaker as is known in the art.
  • the high frequency transducer has a magnet pot with an annular rim extending therefrom. Magnet pot and rim have an inner surface and an outer surface, and a disc shaped magnet is received within said inner surface. A channel is created between an outer circumference of the magnet and the inner surface of the annular rim.
  • a disc shaped pole is positioned on top of the magnet.
  • An annular lip extends inwardly from the rim and is planar with a pole, however a non-magnetic annular air gap is defined therebetween, thus resulting in an outer pole.
  • the magnet is preferably of neodymium iron boron but may be of any other materials having magnet properties substantially similar or superior thereto.
  • An annular holder is positioned on top of and outside the rim and is substantially "L" shaped in cross section. The annular holder has at least a cavity extending therein to accommodate a terminal extending therethrough to outside connectors.
  • An elliptical dome has an annular skirt extending therefrom at an outer periphery in an integral and unitary fashion.
  • the skirt connects with the pole at a side opposing the dome.
  • the elliptical dome is bisected axially and has a major axis extending from a first side of the skirt to a directly opposing side.
  • the dome has a minor axis extending perpendicularly from the major axis to the apex of the dome.
  • the dome can be of any reasonable size as long as the general formula is adhered to.
  • the dome and the skirt are constructed of a rigid material in an integral and unitary fashion to provide further strength to the structure at higher frequency ranges.
  • the dome is constructed from any of a variety of materials such as metals, alloys, metal matrices, and metalloids.
  • a voice coil that is preferably cylindrical in section, is wound around and attached directly to the skirt. To further strengthen the structure, the coil is wound as close as possible to a transitional region between the dome and the skirt.
  • An annular surround is attached directly to the dome at a first periphery portion of the annular surround and to a spacer at a second periphery portion thereof, the spacer being in turn attached to the rim.
  • the mechanical strength of the structure is reinforced and the acoustical performance of the high frequency transducer is significantly improved even at frequencies above 30 kHz.
  • Figure 1 is a partial cross-sectional view of a prior art transducer illustrating the dome, skirt, coil, and surround.
  • Figure 2 is a laser scan of a prior art dome at 22 kHz illustrating the breakup in the periphery of the dome structure.
  • Figure 3 is a cross-sectional view of a high frequency transducer of the present invention having an elliptical dome.
  • Figure 4 is an elevational view of the elliptical dome of Fig. 3 with an integral skirt having a voice coil thereon.
  • Figure 5 is a cross-sectional view of the elliptical dome and skirt taken along line 5-5 of figure 4.
  • Figure 6 is a perspective view of the elliptical dome of Fig. 4 with the skirt extending therefrom and a voice coil connected thereto.
  • Figure 7 is a laser scan of the elliptical dome of Fig. 4 at 22 kHz illustrating the decreased breakup in the outer periphery of the dome.
  • Figure 8 is a graph of the frequency response of the elliptical dome of Fig. 4 compared to the prior art dome by measuring the sound pressure levels in dB.
  • FIG. 3 therein is illustrated an axial cross sectional view of a high frequency transducer 10.
  • the high frequency transducer 10 is a structure that is usually incorporated into a loudspeaker unit (not shown) as is known in the art. Therefore, it is to be understood that a low frequency transducer having a magnet structure, a voice coil, and a diaphragm of generally frusto-conical form is incorporated into the high frequency transducer 10 by any means that are known in the art.
  • Transducer 10 has a magnet pot 12 with an annular rim 14 extending therefrom.
  • Magnet pot 12 may have a generally cylindrical outer surface 16 and be adapted to function with any low frequency transducer known in the art.
  • Magnet pot 12 has an inner surface 18 wherein an annular recess is defined by rim 14 and magnet pot 12.
  • a disc shaped magnet 20 has a bottom 22 and a top 24 interconnected by an outer wall 26. Magnet 20 is received within magnet pot 12 such that bottom 22 is disposed upon inner surface 18. Outer wall 26 of magnet 20 is not in contact with an inner surface of rim 14 and an annular channel 28 is defined therebetween.
  • a disc shaped pole 30 has a first side 32 and a second side 34 interconnected by an outer edge 36. Pole 30 is positioned over magnet 20 such that first side 32 of pole 30 engages top 24 of magnet 20. An annular lip 38 extends inwardly from an upper portion 40 of rim 14. Pole 30 is maintained within a similar plane as lip 38 such that circular outer edge 36 of pole 30 is equidistantly spaced therefrom forming an outer pole. A non-magnetic air gap 42 is defined between outer edge 36 of pole 30 and lip 38 of magnet pot 12.
  • magnet 20 is formed from neodymium iron boron which allows a very substantially enhanced magnetic field strength as compared with other available magnetic materials to be attained in the air gap between the poles.
  • magnet 20 may be formed of other materials having magnetic properties substantially similar or superior to that of neodymium iron boron.
  • ceramic magnet assemblies may also be used and the transducer 10 may be adapted to accommodate such a structure as is known in the art.
  • a holder 44 having an annular shape, is positioned over rim 14 of magnet pot 12.
  • Holder 44 has a vertical portion 46 that connects to outer surface 16 of rim 14 of magnet pot 12, and a horizontal portion 48 that connects to upper portion 40 of rim 14.
  • Vertical portion 46 has at least a cavity extending axially therein to accommodate a terminal 50 extending therefrom to external connectors (not shown).
  • a dome 52 has an annular skirt 54 extending therefrom at an outer periphery. Skirt 54 communicates with second side 34 of pole 30 at an end opposing dome 52.
  • dome 52 has an elliptical shape if bisected axially and has a major axis 56 running from a first side of skirt 54 to an opposing side of skirt 54, and has a minor axis 58 perpendicular thereto.
  • the dome 52 can be of different sizes as long as the general formula is adhered to.
  • Dome 52 and skirt 54 are preferably constructed as an integral unit to increase the structural strength and acoustic performance thereof.
  • Dome 52 may be constructed of a variety of rigid materials, and in a preferred embodiment, dome 52 is constructed from a plurality of metals such as, but not limited to, titanium or aluminum.
  • Dome 52 may also be constructed from a plurality of alloys composed of two or more metals, or of a metal or metals with one or more non-metals.
  • the alloy may be composed of a metal matrix composite comprising one or more metals and one or more metalloids such as, but not limited to, aluminum and boron.
  • "BORALYN" the trademark for a metal matrix composite is used in the construction of the dome and is commercially available from Alyn Coporation of Irvine, California, USA.
  • a voice coil 60 that is preferably cylindrical in section, is wound around skirt 54 and directly connected thereto.
  • coil 60 is preferably wound as close as possible to the transition region wherein dome 52 extends into skirt 54.
  • a surround 62 having an annular shape and being flexible in nature is connected to an outer periphery of dome 52 at a first edge 64, and connects to horizontal portion 48 of holder 44 at a second edge 66.
  • an annular void 68 is defined by skirt 54, surround 62, and horizontal portion 48 of holder 44.
  • Voice coil 60 is connected to a lead out conductor 68 that extends out from the dome region.
  • Lead out conductor 68 extends through and in between surround 62 and horizontal portion 48 of holder 44. Lead out conductor 68 then connects to terminal 50 and is extended out through the cavity extending through vertical portion 46 to external connectors (not shown).

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)
EP00309554A 1999-10-29 2000-10-30 Transducteur acoustique haute fréquence Ceased EP1096830A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB9925674 1999-10-29
GB9925674A GB2359213B (en) 1999-10-29 1999-10-29 High frequency transducer
US09/521,911 US6792127B1 (en) 1999-10-29 2000-03-09 Elliptical dome for high frequency transducer
US521911 2000-03-09

Publications (2)

Publication Number Publication Date
EP1096830A2 true EP1096830A2 (fr) 2001-05-02
EP1096830A3 EP1096830A3 (fr) 2003-05-02

Family

ID=26316039

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00309554A Ceased EP1096830A3 (fr) 1999-10-29 2000-10-30 Transducteur acoustique haute fréquence

Country Status (2)

Country Link
EP (1) EP1096830A3 (fr)
JP (1) JP2001169386A (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005062664A1 (fr) 2003-12-22 2005-07-07 Matsushita Electric Industrial Co., Ltd. Haut-parleur et dispositif mettant en oeuvre celui-ci
JP2007235552A (ja) * 2006-03-01 2007-09-13 Pioneer Electronic Corp スピーカ、ドーム型スピーカ用振動板、およびドーム型スピーカ用振動板の製造方法
CH708956B1 (fr) * 2013-12-09 2021-08-31 Montres Breguet Sa Membrane de rayonnement acoustique pour une montre musicale.
EP2881807B1 (fr) * 2013-12-09 2019-11-27 Montres Breguet SA Membrane de rayonnement acoustique pour une montre musicale
JP7708789B2 (ja) * 2020-12-24 2025-07-15 フォスター電機株式会社 スピーカの放音部材、及びスピーカ装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE626465C (de) * 1929-05-17 1936-02-27 Telefunken Gmbh Elektrodynamischer Grossflaechenlautsprecher
DE2241445A1 (de) * 1972-08-23 1974-03-21 Gottlob Widmann & Soehne Gmbh Kalottenmembran fuer lautsprecher
US4135601A (en) * 1975-06-24 1979-01-23 Pioneer Electronic Corporation Boron coated diaphragm for use in a loud speaker
DE4031742A1 (de) * 1990-10-06 1992-04-09 Nokia Unterhaltungselektronik Kalotten-hochton-lautsprecher
US5181253A (en) * 1991-01-08 1993-01-19 Southern Audio Services, Inc. Loudspeaker assembly

Also Published As

Publication number Publication date
JP2001169386A (ja) 2001-06-22
EP1096830A3 (fr) 2003-05-02

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