WO1999025149A2 - Moving-coil loudspeaker - Google Patents

Moving-coil loudspeaker Download PDF

Info

Publication number
WO1999025149A2
WO1999025149A2 PCT/IT1998/000310 IT9800310W WO9925149A2 WO 1999025149 A2 WO1999025149 A2 WO 1999025149A2 IT 9800310 W IT9800310 W IT 9800310W WO 9925149 A2 WO9925149 A2 WO 9925149A2
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic body
frame
moving
coil loudspeaker
loudspeaker
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
PCT/IT1998/000310
Other languages
English (en)
French (fr)
Other versions
WO1999025149A3 (en
Inventor
Francesco Di Summa
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.)
MACKLAINE DI FRANCESCO DI SUMMA E C SNC
Original Assignee
MACKLAINE DI FRANCESCO DI SUMMA E C SNC
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=11342632&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO1999025149(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority to AU12579/99A priority Critical patent/AU1257999A/en
Priority to KR1020007004916A priority patent/KR20010031843A/ko
Priority to CA002309209A priority patent/CA2309209A1/en
Priority to AT98955893T priority patent/ATE226384T1/de
Priority to JP2000520615A priority patent/JP2001523079A/ja
Application filed by MACKLAINE DI FRANCESCO DI SUMMA E C SNC filed Critical MACKLAINE DI FRANCESCO DI SUMMA E C SNC
Priority to DE69808799T priority patent/DE69808799T2/de
Priority to EP98955893A priority patent/EP1040727B1/de
Publication of WO1999025149A2 publication Critical patent/WO1999025149A2/en
Publication of WO1999025149A3 publication Critical patent/WO1999025149A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • 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
    • H04R7/16—Mounting or tensioning of diaphragms or cones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/025—Magnetic circuit

Definitions

  • the present invention relates to a moving-coil loudspeaker .
  • loudspeakers comprise a frame or basket having two coaxial portions, one truncated-cone-shaped and the other cylindrical; a magnetic body housed coaxially with the frame axis inside the cylindrical portion of the frame; a cone or diaphragm housed in axially-movable manner inside the truncated- cone-shaped portion of the frame, with the smaller peripheral edge coaxial with the magnetic body, and the larger peripheral edge connected to the frame by an elastic annular membrane; and an actuating coil fitted to the smaller peripheral edge of the cone so as to slide on the magnetic body.
  • Known loudspeakers also comprise an elastic centering and damping membrane connecting the actuating coil to the cylindrical portion of the frame to keep the coil coaxial with the magnetic body as the cone moves axially; and a protective cap fitted to the cone to cover and protect the portion of the magnetic body projecting inside the cone.
  • the loudspeaker frame must obviously be so sized as to prevent the protective cap fitted to the cone from knocking against the magnetic body when the cone is backed up inside the frame by the forces generated in the coil by the interaction of the magnetic field and the electric current circulating in the coil .
  • a major drawback of the above structure lies in the total height of the loudspeaker, i.e. the length measured along the frame axis, not being reducible below a minimum value depending on the axial size of the magnetic body and on the size and maximum axial travel of the cone; which limitation runs counter to current market demand for increasingly shorter loudspeakers for a given acoustic efficiency.
  • a moving-coil loudspeaker comprising a substantially cup-shaped frame; a magnetic body fitted integrally to the frame and inside the frame itself; a diaphragm fitted movably inside said frame; and an actuating coil fitted integrally to the diaphragm and in sliding manner to said magnetic body; said loudspeaker being characterized by comprising a first annular centering and damping membrane connecting said diaphragm to said magnetic body.
  • Figure 1 shows a section, with parts removed for clarity, of a loudspeaker in accordance with the teachings of the present invention
  • Figures 2 , 3 and 4 show sections of respective variations of the Figure 1 loudspeaker.
  • Number 1 in Figure 1 indicates as a whole a loudspeaker comprising a substantially cup-shaped frame 2; a magnetic body 3 fitted to the bottom of frame 2 and coaxial with axis A of frame 2 ; and a cone or diaphragm 4 housed coaxially with axis A inside frame 2, with the smaller peripheral edge 5 facing and coaxial with magnetic body 3 , and with the larger peripheral edge 6 at the opening of frame 2.
  • Loudspeaker 1 also comprises an elastic annular supporting membrane 7 connecting the larger peripheral edge 6 of cone 4 to the edge defining the opening of frame 2; and an actuating coil 8 fitted in sliding manner to magnetic body 3 and fitted to the smaller peripheral edge 5 of cone 4.
  • Elastic annular membrane 7 is so formed as to permit axial displacement of cone 4, and coil 8 is immersed in the magnetic field generated by magnetic body 3 , so that cone 4 is moved axially inside frame 2 by the forces generated by the interaction of the magnetic field and any electric current circulating in coil 8.
  • Electric current is supplied to coil 8 by two terminals (not shown) made of electrically conducting material.
  • coil 8 comprises four layers of electrically conducting wire wound about a cylindrical tubular element fitted in sliding manner to magnetic body 3.
  • frame 2 is substantially truncated-cone-shaped and preferably, though not necessarily, made of nonferromagnetic material .
  • Magnetic body 3 is substantially cylindrical, and comprises two substantially tablet-shaped permanent magnets 10, and a spacer washer 11 made of ferromagnetic material and interposed between the two permanent magnets 10 to form a stack coaxial with axis A.
  • Permanent magnets 10 are magnetized in a direction parallel to axis A, and are stacked with similar poles facing spacer washer 11.
  • magnetic body 3 comprises a further two washers 12 preferably, though not necessarily, made of nonferromagnetic material, and which are arranged coaxial with axis A and each contacting a respective permanent magnet 10.
  • magnetic body 3 is fitted to frame 2 by a lock bolt 13 , which comprises a screw 13a extending coaxially with axis A through the bottom wall of frame 2 and through washers 12, magnets 10 and spacer washer 11; and a nut 13b screwed to the end of screw 13a.
  • lock bolt 13 also prevents the stack defined by washers 12, magnets 10 and spacer washer 11 from being parted by the tendency of the two permanent magnets 10 to repel each other.
  • Loudspeaker 1 also comprises a first centering membrane 14 connecting the inner surface 15 of cone 4 to the free end 16 of magnetic body 3 ; and a second centering membrane 17 connecting coil 8, i.e. cone 4, to the lateral wall 18 of frame 2. Both centering membranes 14 and 17 are so formed as to only permit axial displacement of cone 4 and coil 8. Both centering membranes 14 and 17 also provide for damping oscillation of cone 4, and for preventing operation of loudspeaker 1 from being impaired by dirt settling in the gap between magnetic body 3 and coil 8.
  • magnetic body 3 of loudspeaker 1 has neither of washers 12.
  • one of washers 12 of magnetic body 3 (in Figure 3, the one interposed between permanent magnet 10 and the bottom wall of frame 2) is replaced by a substantially tablet-shaped auxiliary permanent magnet 20 magnetized in a direction parallel to axis A of frame 2; and permanent magnet 10 and auxiliary permanent magnet 20 are arranged with dissimilar poles facing each other.
  • both washers 12 are replaced by respective substantially tablet-shaped auxiliary permanent magnets 20 magnetized in a direction parallel to axis A of frame 2 ; and each auxiliary permanent magnet 20 and the corresponding permanent magnet 10 are arranged with dissimilar poles facing each other .
  • loudspeaker 1 is without washer 12 at free end 16 of magnetic body 3, and the washer 12 interposed between permanent magnet 10 and the bottom wall of frame 2 may be replaced by an auxiliary permanent magnet similar to the one in the Figure 4 variation.
  • loudspeaker 1 is without elastic centering membrane 17.
  • loudspeaker 1 Operation of loudspeaker 1 is self-explanatory from the foregoing description.
  • loudspeaker 1 lies in magnetic body 3 extending inside and substantially the full height of frame 2, i.e. along the whole length of frame 2 measured along axis A, thus enabling a considerable reduction in size.
  • the above construction design provides for producing a loudspeaker 1 of a height approximately equal to but no less than the length of magnetic body 3 measured along axis A.
  • loudspeaker 1 lies in the mechanical stress produced by the displacement of cone 4 now being discharged by two elastic centering membranes as opposed to one, which means elastic centering membranes 14 and 17 may be made of lighter, more elastic material to improve the overall acoustic efficiency of loudspeaker 1.
  • a further advantage lies in the provision of washers 12 , which may be either removed or replaced by auxiliary permanent magnets 20 to vary the characteristics of magnetic body 3 according to the application of loudspeaker 1.
  • loudspeaker 1 as described and illustrated herein without, however, departing from the scope of the present invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Support Of Aerials (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
PCT/IT1998/000310 1997-11-06 1998-11-06 Moving-coil loudspeaker Ceased WO1999025149A2 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP98955893A EP1040727B1 (de) 1997-11-06 1998-11-06 Lautsprecher mit beweglicher spule
KR1020007004916A KR20010031843A (ko) 1997-11-06 1998-11-06 이동코일 확성기
CA002309209A CA2309209A1 (en) 1997-11-06 1998-11-06 Moving-coil loudspeaker
AT98955893T ATE226384T1 (de) 1997-11-06 1998-11-06 Lautsprecher mit beweglicher spule
JP2000520615A JP2001523079A (ja) 1997-11-06 1998-11-06 ムービングコイル型ラウドスピーカー
AU12579/99A AU1257999A (en) 1997-11-06 1998-11-06 Moving-coil loudspeaker
DE69808799T DE69808799T2 (de) 1997-11-06 1998-11-06 Lautsprecher mit beweglicher spule

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT97BO000658A IT1296539B1 (it) 1997-11-06 1997-11-06 Altoparlante a bobina mobile.
ITBO97A000658 1997-11-06

Publications (2)

Publication Number Publication Date
WO1999025149A2 true WO1999025149A2 (en) 1999-05-20
WO1999025149A3 WO1999025149A3 (en) 1999-07-22

Family

ID=11342632

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT1998/000310 Ceased WO1999025149A2 (en) 1997-11-06 1998-11-06 Moving-coil loudspeaker

Country Status (11)

Country Link
EP (1) EP1040727B1 (de)
JP (1) JP2001523079A (de)
KR (1) KR20010031843A (de)
CN (1) CN1282502A (de)
AT (1) ATE226384T1 (de)
AU (1) AU1257999A (de)
CA (1) CA2309209A1 (de)
DE (1) DE69808799T2 (de)
ES (1) ES2186239T3 (de)
IT (1) IT1296539B1 (de)
WO (1) WO1999025149A2 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010142315A1 (de) * 2009-06-08 2010-12-16 Norman Gerkinsmeyer Lautsprecher mit mittensicke
GB2480058A (en) * 2010-05-04 2011-11-09 Tzu-Chung Chang Inner spider or damper arrangement for a loudspeaker
EP3729827A1 (de) * 2017-12-19 2020-10-28 PSS Belgium NV Lautsprecher

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115484530B (zh) * 2021-06-16 2026-04-17 北京小米移动软件有限公司 盆架组件、音频模组和电子设备

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4239943A (en) 1977-11-17 1980-12-16 Cerwin Vega, Inc. Adjustable dual spider for a loudspeaker
EP0039740B1 (de) * 1979-11-09 1985-06-26 Matsushita Electric Industrial Co., Ltd. Lautsprecher
JPS5838097A (ja) * 1981-08-28 1983-03-05 Hitachi Ltd スピ−カ・システム
NL8200416A (nl) * 1982-02-04 1983-09-01 Philips Nv Vlakmembraan omzetter en werkwijze voor het vervaardigen van een dergelijke omzetter.
US4737992A (en) 1985-11-15 1988-04-12 Bose Corporation Compact electroacoustical transducer with spider covering rear basket opening
EP0444034A1 (de) * 1988-10-03 1991-09-04 Harman International Industries, Incorporated Elektrodynamische transducer-struktur
DE4021000A1 (de) * 1990-07-02 1992-01-16 Hubertus Doepke Vorrichtung zur erzeugung von schallschwingungen mittels eines elektroakustischen wandlers
DE4130460A1 (de) * 1991-09-13 1993-03-18 Nokia Deutschland Gmbh Elektromagnetischer wandler

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010142315A1 (de) * 2009-06-08 2010-12-16 Norman Gerkinsmeyer Lautsprecher mit mittensicke
GB2480058A (en) * 2010-05-04 2011-11-09 Tzu-Chung Chang Inner spider or damper arrangement for a loudspeaker
EP3729827A1 (de) * 2017-12-19 2020-10-28 PSS Belgium NV Lautsprecher
EP3729827B1 (de) * 2017-12-19 2026-03-18 PSS Belgium NV Lautsprecher

Also Published As

Publication number Publication date
JP2001523079A (ja) 2001-11-20
DE69808799T2 (de) 2003-07-03
EP1040727B1 (de) 2002-10-16
WO1999025149A3 (en) 1999-07-22
KR20010031843A (ko) 2001-04-16
AU1257999A (en) 1999-05-31
EP1040727A2 (de) 2000-10-04
IT1296539B1 (it) 1999-07-09
ITBO970658A0 (it) 1997-11-06
DE69808799D1 (de) 2002-11-21
CN1282502A (zh) 2001-01-31
ATE226384T1 (de) 2002-11-15
ES2186239T3 (es) 2003-05-01
ITBO970658A1 (it) 1999-05-06
CA2309209A1 (en) 1999-05-20

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