EP1410680A1 - Plattenlautsprecher - Google Patents
PlattenlautsprecherInfo
- Publication number
- EP1410680A1 EP1410680A1 EP01965127A EP01965127A EP1410680A1 EP 1410680 A1 EP1410680 A1 EP 1410680A1 EP 01965127 A EP01965127 A EP 01965127A EP 01965127 A EP01965127 A EP 01965127A EP 1410680 A1 EP1410680 A1 EP 1410680A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plate
- bridge
- loudspeaker according
- sound
- damper
- 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
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
- H04R7/045—Plane diaphragms using the distributed mode principle, i.e. whereby the acoustic radiation is emanated from uniformly distributed free bending wave vibration induced in a stiff panel and not from pistonic motion
Definitions
- the invention relates to a plate loudspeaker with a light, thin sound plate that can be excited to reflect flex waves, a peripheral frame that holds the sound plate in an articulated manner, at least one driver connected to the sound plate to excite the sound plate, and at least one driver with the at least one driver the bridge firmly connecting the frame.
- rigid plate loudspeakers are known from US Pat. No. 5,701,359 which operate on the principle of the free piston, the sound-emitting surface (“membrane”) being rigid (like a “piston”).
- membrane the sound-emitting surface
- the sound-radiating surface does not perform any significant bending vibrations in the operating frequency range and that the rigid plate provided as the sound-radiating surface is free, that is to say it is open and not airtightly enclosed by a housing.
- multi-resonance plate loudspeakers are known, for example, from WO 97/09842, weakly damped bending waves occurring in the operating frequency range being reflected at the edge of the plate, so that the membrane becomes a multiple resonator as a result of the formation of standing waves.
- Such multi-resonance plate loudspeakers are also referred to as “multi-resonance sound plates”, “flexible shaft loudspeakers” or “distributed mode speakers”. Even with such loudspeakers, the plate is usually free, that is to say not part of a closed box.
- the usual electrodynamic plate drivers can in principle be fixed in a floating manner on the plate, ie without being supported on a frame. The mass of the magnet system then forms the dynamic counter-bearing for the application of force to the plate to be driven (principle of the "seismic mass").
- the object of the invention is therefore to provide a panel loudspeaker with settlement protection, in which the dynamic side effects of such settlement protection are avoided.
- a plate loudspeaker of the type mentioned at the outset by connecting the bridge or at least one of the bridges to a (preferably rigid) damper plate.
- the bridge not only carries the driver or drivers, but also the damper plate.
- the bridge resonance frequency can be tuned, for example, by mass adaptation.
- the bridge resonance is determined by the ratio of spring constant to total bridge mass with all elements attached to it. Regardless of the damping given by the plate surface of the damping plate, the mass can be adjusted by changing the plate thickness or the plate density of the damping plate so that the radiation contribution of the damping plate fits into the acoustic spectrum of the multi-resonance plate loudspeaker.
- the bridge resonance frequency can also be tuned by adjusting the spring.
- the area moment of inertia and thus the spring constant can be adjusted by changing, for example, the cross-sectional profile of the bridge, so that the resonance zone of the bridge fits in favorably with the acoustic spectrum of the multi-resonance plate loudspeaker.
- At least one bridge is designed as an air-permeable framework.
- at least one bridge can also be designed as an airtight flat box cover.
- the damper plate preferably has a smaller area than the sound plate. Furthermore, it is preferably provided that the damper plate is designed in a light, very rigid sandwich construction. Such a sandwich design is known for example from EP 0 924 959.
- connection points between the bridge (s) and the damper plate can lie in the region of the node lines of the first two vibration modes of the damper plate.
- the damper plate itself can also be part of at least one bridge.
- At least one bridge consists of a prismatic rod, the bridge being the not completely covering the surface given by the frame opposite the sound plate.
- At least one bridge is designed as a regular lattice work and / or as a perforated plate.
- At least one bridge to be resilient and part of an airtight flat box, all of the outer components of this flat box being airtight and being airtight.
- the flat box can have a bass reflex opening (also a bass reflex tube).
- At least one bridge can be designed as a rigid plate and connected to the damper plate by a circumferential bridge bead.
- a chamber can also be attached to the flat box, the chamber also being able to have a bass reflex opening (also a bass reflex tube).
- the chamber can also be airtight.
- the chamber can also have a passive radiator.
- the plate loudspeaker according to the invention therefore represents an asymmetrical two-plate loudspeaker in its acoustic effect, since the main front sound plate facing the listener forms an acoustic multi-resonance sound plate, while the smaller damper plate facing away from the listener is acoustically a rigid plate.
- the degree of damping can be set directly via the surface of the damper plate. The larger the plate, the greater the damping achieved.
- An additional improvement The low-frequency sound radiation from the plate loudspeaker can be achieved by designing the damper plate as a rigid plate and thus not only dampening the bridge resonance vibration, but also contributing to sound radiation in the low-frequency range.
- the low frequency range of free multi-resonance sound plates is always affected by the dipole short circuit. The additional sound radiation partially compensates for this dipole short circuit.
- a particular advantage of the asymmetrical two-panel loudspeaker is the simple drive technology. While known monopole drivers (cf. DE 198 218 62) consist of single drivers arranged back-to-back, alternatively single-side arranged single drivers or complicated double voice coil arrangements, according to the invention only at least one known conventional plate driver is required.
- the two plates work in opposite directions in the low frequency range.
- the arrangement of the two plates then forms a "low-frequency monopole radiator", ie a breathing sphere with partially inactive zones.
- a flat box arrangement it is ventilated in a controlled manner.
- one or more bass reflex openings are provided, through which inside air can flow out in phase, so that a further improvement in the low-frequency behavior is achieved.
- the ventilation of the flat box also avoids the unfavorable effect of air suspension that is too rigid.
- the sealing of the rigid damper plate which is originally not provided for sound radiation and is in one plane with the rear flat box wall, can be designed as a flat leaf spring, so that an enlarged radiation area is achieved with the associated increased radiation attenuation.
- This flat plate spring detunes the spring constant of the original bridge, which has to be taken into account when tuning the resonance.
- FIG. 1 shows a first preferred embodiment of a plate loudspeaker according to the invention as a free, asymmetrical two-plate loudspeaker in which the damper plate is fastened to a bridge,
- FIG. 2 shows a second preferred embodiment of a plate loudspeaker according to the invention as a free, asymmetrical two-plate loudspeaker, in which the damper plate takes over part of the bridge function
- FIG. 3 shows a third preferred embodiment of a plate loudspeaker according to the invention as a free, asymmetrical two-plate loudspeaker, in which the bridge bars simulate a disc spring
- FIG. 4 shows a fourth preferred embodiment as a closed, asymmetrical two-plate loudspeaker
- FIG. 5 shows a fifth preferred embodiment of a plate loudspeaker according to the invention as a closed, asymmetrical two-plate loudspeaker with bass reflex opening
- FIG. 6 shows a sixth preferred embodiment of a plate loudspeaker according to the invention as a closed, asymmetrical two-plate loudspeaker with a rigid plate bridge and bridge bead and
- FIG. 8 shows a seventh preferred embodiment of a plate loudspeaker according to the invention as a closed, asymmetrical two-plate loudspeaker with two chambers and with a rigid plate bridge, bridge bead and bass reflex opening.
- a sound plate 2 is provided as the membrane, which is designed as a multi-resonance sound plate and is consequently characterized by a low mass, a large bending stiffness, a low bending wave damping and a cantilever frame fastening distinguishes.
- a rigid, mostly circumferential frame 3 holds the sound plate 2 over a circumferential plate bearing 4, which acts as a shear-resistant steering acts.
- the static load of the magnet system 6 is thereby borne.
- a voice coil 7 immersed in the annular gap of the magnet system 6 is centered on the one hand by means of an inner bead 10 with respect to the magnet system 6 and at the same time firmly connected to the sound plate 2.
- An outer bead 9 holds the static load of the magnet system 6 during speaker assembly. At the same time, it represents a floating magnetic attachment, as is useful for horizontal operation.
- the frame 3 and / or the bridge 5 contains openings 11 (gaps) through which a pressure equalization of the air which is otherwise enclosed is ensured.
- the free, asymmetrical two-plate loudspeaker 1 has one
- Damper plate 14 which is attached to the prepared bridge 13 of the sound plate 2 facing away.
- the large plate area of the damper plate 14 is aligned approximately plane-parallel to the large plate area of the sound plate 2.
- FIG. 2 shows in section a further preferred embodiment of a plate loudspeaker according to the invention designed as a free, asymmetrical two-plate loudspeaker 12, the damper plate 14 being attached directly to the magnet system 6.
- Relatively short bridge bars 16 connect the damper plate 14 to the frame 3.
- the damper plate 14 thus represents a widened part of the bridge 15 formed from the bridge bars 16 and thus exercises Function of the bridge 15 as a static weight relief.
- the large plate area of the damper plate 14 is again aligned approximately plane-parallel to the large plate area of the sound plate 2.
- the embodiment shown in FIG. 2 corresponds to the embodiment shown in FIG. 1.
- FIG. 3 shows a further preferred embodiment of a plate loudspeaker according to the invention as a free asymmetrical two-plate loudspeaker 17, in contrast to the embodiment shown in FIG. 2 only the bridge bars 16 being replaced by a circumferential disc spring 18.
- the static function of the plate spring 18 is the same as that of the bars 16 in FIG. 2, but there is a different acoustic behavior.
- the sound plate 2 is in fact shielded against a possibly existing, near building wall and thus forms a helpful measure against the undesirable “wall effect”.
- a closed, asymmetrical two-plate loudspeaker 19 is provided, in contrast to FIG. 3 all remaining ventilation openings 11 having been closed.
- the suspension caused by the cover 20 is substantially hardened by the compression suspension of the enclosed air.
- FIG. 5 shows in section an inventive plate loudspeaker designed as an asymmetrical two-plate bass reflex loudspeaker 21.
- the exemplary embodiment according to FIG. 6 differs from the exemplary embodiment shown in FIG. 5 in that an asymmetrical two-plate loudspeaker 24 according to the invention, starting from the embodiment according to FIG. 5, has a rigid plate bridge 25 and a bridge bead 26, the damper plate 14 also being connected via the bridge bead 26 the plate bridge 25 is connected to oscillate.
- the plate bridge 25 is attached to the frame 3.
- the preferred embodiment of a plate loudspeaker according to the invention shown in section in FIG. 7 as a closed, asymmetrical two-plate two-chamber loudspeaker 27, starting from the exemplary embodiment according to FIG. 6, comprises, in addition to the rigid plate bridge 25 and the bridge bead 26, a second chamber 28 which is equipped with a bass reflex tube 23 is.
- the second chamber 28 adjoins the rear end of the two-plate two-chamber loudspeaker 27, that is to say on the side of the two-plate two-chamber loudspeaker 27 that includes the damper plate 14.
- the second chamber 28 can also be closed or have a passive radiator 29.
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2001/008104 WO2003013186A1 (de) | 2001-07-13 | 2001-07-13 | Plattenlautsprecher |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1410680A1 true EP1410680A1 (de) | 2004-04-21 |
EP1410680B1 EP1410680B1 (de) | 2010-12-15 |
Family
ID=8164508
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01965127A Expired - Lifetime EP1410680B1 (de) | 2001-07-13 | 2001-07-13 | Plattenlautsprecher |
Country Status (4)
Country | Link |
---|---|
US (1) | US7187776B2 (de) |
EP (1) | EP1410680B1 (de) |
DE (1) | DE50115744D1 (de) |
WO (1) | WO2003013186A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9380387B2 (en) | 2014-08-01 | 2016-06-28 | Klipsch Group, Inc. | Phase independent surround speaker |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1480489A3 (de) * | 2003-05-23 | 2009-07-01 | Alps Electric Co., Ltd. | Erregereinrichtung zum Erzeugen von Schall |
DE102005058175A1 (de) * | 2005-12-05 | 2007-06-06 | Volkswagen Ag | Lautsprecheranordnung zur Beschallung in einem Kraftfahrzeug |
EP1989915A1 (de) * | 2006-02-16 | 2008-11-12 | Bang & Olufsen IcePower A/S | Mikrowandler mit verbesserter wahrgenommener tonqualität |
JP4784398B2 (ja) * | 2006-05-29 | 2011-10-05 | パナソニック株式会社 | 音響加振器およびこれを用いたスピーカ |
JP2009076834A (ja) * | 2006-11-27 | 2009-04-09 | Fujifilm Corp | 有機電界発光素子および新規なインドール誘導体 |
US10412499B2 (en) * | 2017-10-13 | 2019-09-10 | Harish Bhutani | Loudspeaker driver/exciter with unique design to facilitate mounting |
DE102018124261B4 (de) * | 2018-10-01 | 2020-06-04 | Grawe & Schneider GdbR (vertretungsberechtigte Gesellschafter: Thomas Grawe, 83088 Kiefersfelden und Gerd-Peter Schneider, 84032 Landshut) | Planarlautsprecher |
US10674270B2 (en) | 2018-10-24 | 2020-06-02 | Google Llc | Magnetic distributed mode actuators and distributed mode loudspeakers having the same |
DE102019205628A1 (de) * | 2019-04-17 | 2020-10-22 | BSH Hausgeräte GmbH | Vorrichtung zur Wiedergabe von haptischen Signalen und Audiosignalen |
NL2031944B1 (en) * | 2022-05-20 | 2023-11-27 | Microsoft Technology Licensing Llc | Tuning spring mass resonator of loudspeaker in mobile device |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5701359A (en) * | 1995-04-06 | 1997-12-23 | Precision Power | Flat-panel speaker |
GB9807316D0 (en) * | 1998-04-07 | 1998-06-03 | New Transducers Ltd | Loudspeaker |
DE69804199T2 (de) * | 1997-01-09 | 2002-07-18 | New Transducers Ltd | Lautsprecher |
DE19757097B4 (de) * | 1997-12-20 | 2004-04-15 | Harman Audio Electronic Systems Gmbh | Schallwiedergabeanordnung |
DE19821862A1 (de) * | 1998-05-15 | 1999-11-18 | Nokia Deutschland Gmbh | Schallwiedergabeanordnung |
JP2000050384A (ja) * | 1998-08-03 | 2000-02-18 | Sony Corp | スピーカ装置 |
DE19922395C1 (de) * | 1999-05-14 | 2001-01-11 | Harman Audio Electronic Sys | Deckenelement |
WO2001008447A2 (en) * | 1999-07-23 | 2001-02-01 | Digital Sonics, Llc | Flat panel speaker |
DE19940930A1 (de) | 1999-08-27 | 2001-03-29 | Harman Audio Electronic Sys | Elektrodynamischer Treiber |
-
2001
- 2001-07-13 WO PCT/EP2001/008104 patent/WO2003013186A1/de active Application Filing
- 2001-07-13 EP EP01965127A patent/EP1410680B1/de not_active Expired - Lifetime
- 2001-07-13 DE DE50115744T patent/DE50115744D1/de not_active Expired - Lifetime
- 2001-07-13 US US10/483,719 patent/US7187776B2/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO03013186A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9380387B2 (en) | 2014-08-01 | 2016-06-28 | Klipsch Group, Inc. | Phase independent surround speaker |
Also Published As
Publication number | Publication date |
---|---|
US20050031155A1 (en) | 2005-02-10 |
EP1410680B1 (de) | 2010-12-15 |
WO2003013186A1 (de) | 2003-02-13 |
US7187776B2 (en) | 2007-03-06 |
DE50115744D1 (de) | 2011-01-27 |
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