EP1040727A2 - Moving-coil loudspeaker - Google Patents
Moving-coil loudspeakerInfo
- Publication number
- EP1040727A2 EP1040727A2 EP98955893A EP98955893A EP1040727A2 EP 1040727 A2 EP1040727 A2 EP 1040727A2 EP 98955893 A EP98955893 A EP 98955893A EP 98955893 A EP98955893 A EP 98955893A EP 1040727 A2 EP1040727 A2 EP 1040727A2
- Authority
- EP
- European Patent Office
- 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.)
- Granted
Links
- 230000005291 magnetic effect Effects 0.000 claims abstract description 45
- 239000012528 membrane Substances 0.000 claims abstract description 17
- 238000013016 damping Methods 0.000 claims abstract description 8
- 125000006850 spacer group Chemical group 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 3
- 239000003302 ferromagnetic material Substances 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 description 7
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000003993 interaction Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
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
- H04R9/04—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; DEAF-AID SETS; 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; DEAF-AID SETS; 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; 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
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.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITBO970658 | 1997-11-06 | ||
IT97BO000658A IT1296539B1 (en) | 1997-11-06 | 1997-11-06 | SPEAKER WITH MOBILE COIL. |
PCT/IT1998/000310 WO1999025149A2 (en) | 1997-11-06 | 1998-11-06 | Moving-coil loudspeaker |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1040727A2 true EP1040727A2 (en) | 2000-10-04 |
EP1040727B1 EP1040727B1 (en) | 2002-10-16 |
Family
ID=11342632
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98955893A Expired - Lifetime EP1040727B1 (en) | 1997-11-06 | 1998-11-06 | Moving-coil loudspeaker |
Country Status (11)
Country | Link |
---|---|
EP (1) | EP1040727B1 (en) |
JP (1) | JP2001523079A (en) |
KR (1) | KR20010031843A (en) |
CN (1) | CN1282502A (en) |
AT (1) | ATE226384T1 (en) |
AU (1) | AU1257999A (en) |
CA (1) | CA2309209A1 (en) |
DE (1) | DE69808799T2 (en) |
ES (1) | ES2186239T3 (en) |
IT (1) | IT1296539B1 (en) |
WO (1) | WO1999025149A2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009024566A1 (en) * | 2009-06-08 | 2010-12-09 | Norman Gerkinsmeyer | center bead |
GB2480058A (en) * | 2010-05-04 | 2011-11-09 | Tzu-Chung Chang | Inner spider or damper arrangement for a loudspeaker |
Citations (2)
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 |
US4737992A (en) | 1985-11-15 | 1988-04-12 | Bose Corporation | Compact electroacoustical transducer with spider covering rear basket opening |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0039740B1 (en) * | 1979-11-09 | 1985-06-26 | Matsushita Electric Industrial Co., Ltd. | Loud-speaker |
JPS5838097A (en) * | 1981-08-28 | 1983-03-05 | Hitachi Ltd | Loudspeaker system |
NL8200416A (en) * | 1982-02-04 | 1983-09-01 | Philips Nv | FLAT MEMBRANE CONVERTER AND METHOD FOR MAKING SUCH A CONVERTER |
JPH04500890A (en) * | 1988-10-03 | 1992-02-13 | ハーマン インターナショナル インダストリーズ,インコーポレイテッド | Structure of electrodynamic converter |
DE4021000A1 (en) * | 1990-07-02 | 1992-01-16 | Hubertus Doepke | HI=FI loudspeaker with sprung coupling member - has mechanical oscillation element controlled by movement of electrical conductor within magnetic field |
DE4130460A1 (en) * | 1991-09-13 | 1993-03-18 | Nokia Deutschland Gmbh | ELECTROMAGNETIC CONVERTER |
-
1997
- 1997-11-06 IT IT97BO000658A patent/IT1296539B1/en active IP Right Grant
-
1998
- 1998-11-06 KR KR1020007004916A patent/KR20010031843A/en not_active Application Discontinuation
- 1998-11-06 DE DE69808799T patent/DE69808799T2/en not_active Expired - Fee Related
- 1998-11-06 WO PCT/IT1998/000310 patent/WO1999025149A2/en not_active Application Discontinuation
- 1998-11-06 CN CN98812341A patent/CN1282502A/en active Pending
- 1998-11-06 AU AU12579/99A patent/AU1257999A/en not_active Abandoned
- 1998-11-06 CA CA002309209A patent/CA2309209A1/en not_active Abandoned
- 1998-11-06 EP EP98955893A patent/EP1040727B1/en not_active Expired - Lifetime
- 1998-11-06 ES ES98955893T patent/ES2186239T3/en not_active Expired - Lifetime
- 1998-11-06 JP JP2000520615A patent/JP2001523079A/en active Pending
- 1998-11-06 AT AT98955893T patent/ATE226384T1/en not_active IP Right Cessation
Patent Citations (2)
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 |
US4737992A (en) | 1985-11-15 | 1988-04-12 | Bose Corporation | Compact electroacoustical transducer with spider covering rear basket opening |
Also Published As
Publication number | Publication date |
---|---|
CN1282502A (en) | 2001-01-31 |
WO1999025149A2 (en) | 1999-05-20 |
CA2309209A1 (en) | 1999-05-20 |
AU1257999A (en) | 1999-05-31 |
ES2186239T3 (en) | 2003-05-01 |
DE69808799T2 (en) | 2003-07-03 |
ITBO970658A1 (en) | 1999-05-06 |
EP1040727B1 (en) | 2002-10-16 |
KR20010031843A (en) | 2001-04-16 |
DE69808799D1 (en) | 2002-11-21 |
ITBO970658A0 (en) | 1997-11-06 |
IT1296539B1 (en) | 1999-07-09 |
WO1999025149A3 (en) | 1999-07-22 |
ATE226384T1 (en) | 2002-11-15 |
JP2001523079A (en) | 2001-11-20 |
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