WO2004017674A1 - Loudspeaker with inverted cone - Google Patents
Loudspeaker with inverted cone Download PDFInfo
- Publication number
- WO2004017674A1 WO2004017674A1 PCT/IB2003/003402 IB0303402W WO2004017674A1 WO 2004017674 A1 WO2004017674 A1 WO 2004017674A1 IB 0303402 W IB0303402 W IB 0303402W WO 2004017674 A1 WO2004017674 A1 WO 2004017674A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- actuator
- diaphragm
- loudspeaker
- chassis
- translatable
- Prior art date
Links
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
- H04R9/06—Loudspeakers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
- H04R9/04—Construction, mounting, or centering of coil
Definitions
- the invention relates to an electrodynamic loudspeaker comprising a chassis, a movable body flexibly connected to the chassis and having a three-dimensional diaphragm with a base part and a top part which is wider than the base part, and an electromagnetic actuator for moving said body with respect to the chassis along a translation axis extending between said two parts of the diaphragm, which actuator comprises a stationary actuator part secured to the chassis and a translatable actuator part, which latter part substantially extends inside the space enveloped by the contours of the diaphragm and which latter part is translatable along the translation axis with respect to the stationary actuator part and is connected to the movable body in the region of the base part of the diaphragm, said actuator parts being capable of magnetically co-operating with each other across an air gap.
- the invention relates to a so-called inverted loudspeaker.
- GB-A 2 360 849 discloses an inverted coaxial speaker for use in automobile doors and similar thin structures.
- This known speaker has a frame, an electromagnetic actuator, and a frustoconical speaker cone.
- This cone has an outer perimeter secured via a roll section to the frame and an inner perimeter secured to one end of a cylindrical coil former of the actuator, a flexible corrugated suspension member extending between this end and the frame.
- the other end of the coil former extends into an annular gap of an magnetic yoke fixed to the frame and carries a voice coil.
- the known inverted speaker has a smaller axial dimension than generally known conventional speakers in which the actuator is situated behind a backplane of the speaker cone, the known inverted speaker has still a relatively great height owing to the required relatively long voice coil former.
- the loudspeaker which is characterized in that the movable body comprises, in the proximity of the base part of the diaphragm, a bridging element which is secured to the movable part of the actuator and extends radially with respect to the translation axis, the diaphragm and the bridging element being interconnected at least at a radial distance to the translatable part of the actuator.
- the base part of the diaphragm needs not to be fastened to the translatable part of the actuator, but is secured to the bridging element and is thus indirectly connected to the translatable part, hi consequence of this, the width of the base part is greater than the corresponding dimension of the translatable part of the actuator. This renders it possible to shorten the translatable part of the actuator with respect to the length of the coil former of the inverted speaker disclosed in the above-mentioned GB-A 2 360 899 without reducing the effective axial displacement possibility of the movable body.
- the coaxial loudspeaker according to the invention has a ratio between the height of the construction and the stroke of the movable part thereof which is very suitable for high-performance applications in structures of limited depth.
- the loudspeaker has only a limited axial dimension in spite of its three- dimensional diaphragm, so that it has a small building-in depth.
- the speaker is eminently suitable for use in subwoofer systems in which compact, shallow housings are desired or even required. Such conditions are plentifully present in the automotive field, where speakers are mounted into e.g. car doors and dashboards and even under seats.
- the loudspeaker according to the invention with both a first flexible connecting means proximate to the top part of the diaphragm and a second flexible connecting means proximate to the base part of the diaphragm for movably supporting the translatable body with respect to the chassis.
- the first connecting means is fixed to the chassis and the diaphragm
- the second connecting means is fixed to the chassis and the bridging element.
- the bridging element is designed such that it functions as a cooling element during operation.
- a thermally conductive material such as a metal, e.g. aluminum
- An embodiment of the loudspeaker in accordance with the invention has the feature that the bridging element is a thermally conductive disc-shaped element. Due to the direct connection between the movable part of the actuator and the disc-shaped bridging element, heat generated in the actuator during operation is given off to the surroundings via the disc-shaped element. Consequently, the temperature in the actuator remains relatively low during use. It has been found that the temperature remains within limits, set for the use of modern magnetic materials, even in the case of high powers.
- the stationary actuator part comprises a magnetic structure and the translatable actuator part comprises a magnetic coil - also referred to as voice coil -, the magnetic coil extending into the air gap.
- the magnetic structure comprises a permanent magnet and usually a soft- magnetic yoke.
- an electrical current is flowing through the coil for generating, in co-operation with the magnetic field of the permanent magnet, an axial force for driving the movable body. It is inevitable that the electrical current also generates heat in the coil.
- the disc-shaped element is provided with at least one tuning opening.
- Such an opening or openings may be used for tuning the mass of the entire movable structure of the loudspeaker. This relatively easy tuning widens the manufacturing tolerances for the other components of the movable structure, particularly the diaphragm, and thus reduces the manufacturing cost of the loudspeaker.
- the tuning opening or openings may also be used for tuning the mechanical Q- factor of the actuator. It is also assumed that this factor, which is related to the counteracting mechanical forces of the construction, is generally known to those skilled in the art, and for this reason the Q-factor is not explained here. Reference is made e.g. to Leo L.
- the friction resistance acting on the bridging element during operation can be adjusted so as to improve the Q-factor, in dependence on the size of the tuning opening or openings.
- An embodiment of the loudspeaker is characterized in that the cooling element has an anodized cooling surface. This feature gives the cooling element an improved heat- radiating capacity.
- a suitable metal for the cooling element is aluminum.
- the invention also relates to a loudspeaker unit comprising the electrodynamic loudspeaker according to the invention and a housing accommodating the loudspeaker.
- the loudspeaker unit may form part of a compact subwoofer system in which the loudspeaker can be subjected to a high load.
- the loudspeaker according to the invention occupies only a limited space in the housing, which may be formed by a car door or portion thereof or by another suitable mechanical structure of a car. High powers of the order of, for example, about 300 watts are possible.
- Fig. 1 shows an embodiment of the loudspeaker according to the invention in a diagrammatic cross-section
- Fig. 2 is a view taken along arrow A of an essential component of the loudspeaker shown in Fig. 1, and
- Fig. 3 is a perspective exploded view of the loudspeaker of Fig. 1.
- the electrodynamic loudspeaker according to the invention shown in the Figures comprises a chassis 2, in this example comprising two chassis parts, a movable body 4, and an electromagnetic actuator 6.
- the loudspeaker may be accommodated in a housing.
- the chassis 2 of the loudspeaker may be fixed in an appropriate opening in a wall of the housing.
- the housing is shown diagrammatically as a wall section 1 in broken lines.
- the translatable body 4 comprises a three-dimensional diaphragm 8, in this example a conical diaphragm, which is situated at least partly in the chassis 2.
- the diaphragm 8 has a relatively wide top part 8a and a relatively narrow base part 8b.
- the contours of the diaphragm bound and define an inner space 9.
- the function of the electromagnetic actuator 6 is to displace the body 4 along a translation axis 10, which is the central axis of the loudspeaker and extends in a direction from the top part 8a to the base part 8b, or vice versa.
- the actuator 6 essentially comprises two elements, namely a stationary actuator part 6a which is fixed to the chassis 2 and a translatable actuator part 6b which is connected to the translatable body 4 and is situated in or at least mainly in the space 9 enveloped by the contours of the diaphragm 8.
- One of the actuator parts - in this example the part 6a - is provided with a permanent magnet 12, in this example annular in shape and axially polarized, and the other actuator part - in this example the part 6b - is provided with a magnet coil 14.
- the permanent magnet 12 is formed from an neodymium-iron-boron alloy and forms a magnetic yoke with soft iron portions of the stationary actuator part 6a, which yoke defines the air gap 16 in this example.
- the magnet coil 14, being a cylindrical coil, also referred to as voice coil, is situated on a coil support 14a, which is a sleeve in this example and is fixed to the translatable body 4.
- the depicted coaxial loudspeaker is provided with a flexible connection for the translatable body 4 and hence for the diaphragm 8.
- This flexible connection comprises a first flexible connecting means 18 proximate to the top part 8a of the diaphragm 8 and a second flexible connecting means 20 proximate to the base part 8b of the diaphragm 8.
- the flexible connection is to ensure that the body 4, and thus the diaphragm 8, can perform well- defined translation movements with respect to the chassis 2.
- the first flexible connection means 18 has a roll structure know per se and formed from, for example, a bent rubber or foam annular rim which is secured, for example glued, by its outer circumference to the chassis 2 and by its inner circumference to the membrane 8.
- the second flexible connecting means 20 has a flexible corrugated member known per se, which is secured by its outer circumference to the chassis 2.
- the loudspeaker according to the invention is provided with a bridging element 22 secured to the coil support 14a of the translatable actuator part 6b.
- the bridging element 22 is a disc-shaped element which is made for cooling purposes from a thermally well-conductive material, e.g. aluminum, copper.
- the plate- shaped bridging element 22 has been secured to the coil support 14a, by means of e.g. soldering, glueing or another suitable process.
- the bridging element 22 is perpendicularly oriented with respect to the translation axis 10 and hence with respect to the sleeve-shaped coil support 14a and thus extends in a radial direction with respect to the translation axis 10 and the coil support 14a.
- the diaphragm 8 of the loudspeaker is shaped such that it can be fastened, e.g. glued, by its rim 8bl to an edging section 22a of the bridging element 22. Owing to this measure, the connection between the diaphragm 8 and the translatable actuator part 6b is effected via the bridging element 22, the fastening of the diaphragm 8 to the bridging element 22 being at a radial distance to the translatable actuator part 6b.
- This feature leads to favorable mutual positions of the diaphragm 8 and the stationary actuator part 6, in the sense that the space 24 between the rim 8a of the diaphragm 8 and the oppositely located portion of the stationary actuator part 6a can be optimally used for translating the actuator part 6b.
- the second flexible connecting means 20 mentioned above is in this embodiment secured by its inner circumference to the edging section 22a of the bridging element 22.
- the bridging element 22 may be optionally provided with tuning openings 26 for e.g. mass tuning and/or tuning of the Q-factor of the loudspeaker.
- the element 22 may have an anodized cooling surface.
- the invention is not limited to the embodiment shown.
- the diaphragm may have a shape which differs from the cone shape.
- the loudspeaker unit may not only comprise one or more loudspeakers according to the invention, but also one or more bass reflex ports and/or one or more passive radiators.
- the loudspeakers are not limited to a certain power.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003250423A AU2003250423A1 (en) | 2002-08-16 | 2003-07-31 | Loudspeaker with inverted cone |
JP2004528750A JP4278161B2 (en) | 2002-08-16 | 2003-07-31 | Loudspeaker with inverted cone |
DE60305930T DE60305930T2 (en) | 2002-08-16 | 2003-07-31 | SPEAKER WITH INVERTED CONE |
US10/524,401 US7382893B2 (en) | 2002-08-16 | 2003-07-31 | Loudspeaker with inverted cone |
EP03787953A EP1532840B1 (en) | 2002-08-16 | 2003-07-31 | Loudspeaker with inverted cone |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02078392.4 | 2002-08-16 | ||
EP02078392 | 2002-08-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004017674A1 true WO2004017674A1 (en) | 2004-02-26 |
Family
ID=31725468
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2003/003402 WO2004017674A1 (en) | 2002-08-16 | 2003-07-31 | Loudspeaker with inverted cone |
Country Status (8)
Country | Link |
---|---|
US (1) | US7382893B2 (en) |
EP (1) | EP1532840B1 (en) |
JP (1) | JP4278161B2 (en) |
CN (1) | CN100592825C (en) |
AT (1) | ATE329474T1 (en) |
AU (1) | AU2003250423A1 (en) |
DE (1) | DE60305930T2 (en) |
WO (1) | WO2004017674A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2876898A3 (en) * | 2013-11-21 | 2015-07-08 | Harman International Industries, Incorporated | Inverted dual coil transducer |
WO2020239766A1 (en) | 2019-05-29 | 2020-12-03 | Pss Belgium Nv | Loudspeaker |
WO2021224155A1 (en) | 2020-05-07 | 2021-11-11 | Pss Belgium Nv | Loudspeaker and method for manufacturing the same |
WO2023222607A1 (en) | 2022-05-17 | 2023-11-23 | Pss Belgium Nv | Loudspeaker |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1992996B (en) * | 2005-12-30 | 2012-02-29 | 丁轶 | Detachable supporting structure for loudspeaker diaphragm |
JP5278045B2 (en) * | 2009-03-04 | 2013-09-04 | パナソニック株式会社 | Speaker |
EP2373056B1 (en) | 2010-03-12 | 2013-05-15 | Harman International Industries Ltd. | Loudspeaker of an inverted motor design and corresponding assembly method |
US8300873B2 (en) * | 2010-07-14 | 2012-10-30 | American Greetings Corporation | Low profile greeting card speaker |
JP6270651B2 (en) * | 2014-07-24 | 2018-01-31 | アルパイン株式会社 | Speaker device |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4029910A (en) * | 1974-05-01 | 1977-06-14 | Allison Acoustics, Inc. | Wide dispersion loudspeaker with flexing diaphragm |
DE19534342A1 (en) * | 1994-09-15 | 1996-03-21 | Bose Corp | Loudspeaker membrane-cone fixture arrangement |
EP0806883A2 (en) * | 1996-05-10 | 1997-11-12 | NOKIA TECHNOLOGY GmbH | Loudspeaker |
WO1998002017A1 (en) * | 1996-07-08 | 1998-01-15 | Harman Sweden, Filial Till Harman Audio Electronic Systems Gmbh, Tyskland | Inverted loudspeakers |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4737992A (en) * | 1985-11-15 | 1988-04-12 | Bose Corporation | Compact electroacoustical transducer with spider covering rear basket opening |
US5802191A (en) * | 1995-01-06 | 1998-09-01 | Guenther; Godehard A. | Loudspeakers, systems, and components thereof |
TW305509U (en) * | 1996-12-03 | 1997-05-11 | rong-guo Cai | Improved structure of speaker |
US6327372B1 (en) * | 1999-01-05 | 2001-12-04 | Harman International Industries Incorporated | Ceramic metal matrix diaphragm for loudspeakers |
GB2360899B (en) | 1999-12-17 | 2002-03-27 | Goodmans Loudspeakers Ltd | Coaxial speaker |
DE60138503D1 (en) * | 2000-03-23 | 2009-06-10 | Panasonic Corp | speaker |
GB0104113D0 (en) * | 2001-02-20 | 2001-04-11 | Kh Technology Corp | Loudspeaker pole pieces |
US6678387B2 (en) * | 2001-10-30 | 2004-01-13 | Alpine Electronics, Inc. | Loudspeaker having cooling system |
-
2003
- 2003-07-31 JP JP2004528750A patent/JP4278161B2/en not_active Expired - Lifetime
- 2003-07-31 AU AU2003250423A patent/AU2003250423A1/en not_active Abandoned
- 2003-07-31 US US10/524,401 patent/US7382893B2/en active Active
- 2003-07-31 WO PCT/IB2003/003402 patent/WO2004017674A1/en active IP Right Grant
- 2003-07-31 DE DE60305930T patent/DE60305930T2/en not_active Expired - Lifetime
- 2003-07-31 AT AT03787953T patent/ATE329474T1/en not_active IP Right Cessation
- 2003-07-31 EP EP03787953A patent/EP1532840B1/en not_active Expired - Lifetime
- 2003-07-31 CN CN03819364A patent/CN100592825C/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4029910A (en) * | 1974-05-01 | 1977-06-14 | Allison Acoustics, Inc. | Wide dispersion loudspeaker with flexing diaphragm |
DE19534342A1 (en) * | 1994-09-15 | 1996-03-21 | Bose Corp | Loudspeaker membrane-cone fixture arrangement |
EP0806883A2 (en) * | 1996-05-10 | 1997-11-12 | NOKIA TECHNOLOGY GmbH | Loudspeaker |
WO1998002017A1 (en) * | 1996-07-08 | 1998-01-15 | Harman Sweden, Filial Till Harman Audio Electronic Systems Gmbh, Tyskland | Inverted loudspeakers |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2876898A3 (en) * | 2013-11-21 | 2015-07-08 | Harman International Industries, Incorporated | Inverted dual coil transducer |
US9445201B2 (en) | 2013-11-21 | 2016-09-13 | Harman International Industries, Inc. | Inverted dual coil transducer |
WO2020239766A1 (en) | 2019-05-29 | 2020-12-03 | Pss Belgium Nv | Loudspeaker |
US11924621B2 (en) | 2019-05-29 | 2024-03-05 | Pss Belgium Nv | Loudspeaker |
WO2021224155A1 (en) | 2020-05-07 | 2021-11-11 | Pss Belgium Nv | Loudspeaker and method for manufacturing the same |
WO2023222607A1 (en) | 2022-05-17 | 2023-11-23 | Pss Belgium Nv | Loudspeaker |
Also Published As
Publication number | Publication date |
---|---|
ATE329474T1 (en) | 2006-06-15 |
US20050238187A1 (en) | 2005-10-27 |
DE60305930T2 (en) | 2007-01-18 |
JP4278161B2 (en) | 2009-06-10 |
DE60305930D1 (en) | 2006-07-20 |
CN1675960A (en) | 2005-09-28 |
US7382893B2 (en) | 2008-06-03 |
AU2003250423A1 (en) | 2004-03-03 |
CN100592825C (en) | 2010-02-24 |
EP1532840B1 (en) | 2006-06-07 |
EP1532840A1 (en) | 2005-05-25 |
JP2005536138A (en) | 2005-11-24 |
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