EP1264511A1 - Plattenlautsprecher - Google Patents
PlattenlautsprecherInfo
- Publication number
- EP1264511A1 EP1264511A1 EP01271809A EP01271809A EP1264511A1 EP 1264511 A1 EP1264511 A1 EP 1264511A1 EP 01271809 A EP01271809 A EP 01271809A EP 01271809 A EP01271809 A EP 01271809A EP 1264511 A1 EP1264511 A1 EP 1264511A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- panel
- plate
- loudspeaker according
- drivers
- 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.)
- Withdrawn
Links
- 238000005452 bending Methods 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 230000005284 excitation Effects 0.000 claims description 4
- 230000010358 mechanical oscillation Effects 0.000 abstract 1
- 230000003534 oscillatory effect Effects 0.000 abstract 1
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000013016 damping Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000003068 static effect 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
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/04—Plane diaphragms
-
- 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
-
- 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
- H04R7/12—Non-planar diaphragms or cones
Definitions
- the invention relates to a plate loudspeaker.
- Loudspeakers are known in which a flat membrane is used instead of the conventional cone membrane.
- the upper operating frequency of such loudspeakers known as plate loudspeakers, is determined by what is known as "breaking open", that is to say the occurrence of the first bending vibration resonance to be avoided.
- Multi-resonance record speakers have the appeal of "flatness" for the user, that is, a thickness that is significantly less than that of familiar boxes. The reproduction in the high and mid range is satisfactory.
- bass reproduction is problematic due to the known dipole short circuit in an open record.
- One remedy is, for example, the rear end of the plate with a flat housing, which, however, partially nullifies the advantages of a free-standing plate without a housing.
- the invention is based on the object of specifying a multi-resonance panel loudspeaker which, despite the large surface area and the shallow depth, in particular in the case of deep tones, has improved properties.
- the plate loudspeaker according to the invention is characterized not only by an improved low-frequency reproduction, but also by a dipole cutoff frequency that is lower than that specified by the short edge length.
- the plate loudspeaker according to the invention does not work even when subjected to extreme impulses.
- a plate loudspeaker with a plate of low mass, a holder for mounting the plate and at least one driver in vibration connection with the plate for generating mechanical vibrations as a function of electrical control signals, the plate being at least one-dimensionally curved.
- the invention enables a change in the bending stiffness of plates in selected spatial directions by appropriate shaping. Influencing the acoustic parameters of a plate via the bending stiffness also enables the use of unfavorable aspect ratios.
- a further improvement in the acoustic properties is achieved in that the plate is tensioned.
- the bracing can be done internally by means of appropriate manufacturing processes in the shaping of the plate or externally forces generated from outside by suitable means.
- the plate is preferably arranged in such a way that it can be excited by the driver to bending waves that are reflected many times.
- the plate is preferably mounted essentially self-supporting and with low damping in a sealed holder.
- a plurality of drivers can also be provided, the polarity of the drivers being linked to the sign of the curvature of the plate, and preferably in such a way that with appropriate excitation by the drivers in the audio frequency range both above and below the critical frequency and / or both above and A sound conversion also takes place below the bending wave resonance.
- the plate is composed of seamlessly arranged profile sections. This enables plates of almost any size to be produced in a simple manner.
- the profile cuts are preferably made identically, so that the manufacturing outlay for the profile cuts is significantly reduced.
- the profile cuts can advantageously not be identical in order, for example, to be able to produce particularly stable and / or strongly curved plates.
- the radii of curvature are preferably chosen so that they are at least in the order of the edge lengths.
- the holder is sealed in such a way that it closes tightly at least on one edge upon contact with a surface provided for attaching the plate. This largely avoids the undesired dipole effect.
- at least one edge is provided with a sealing lip so that it
- the plate of a plate loudspeaker according to the invention can be formed by an appropriately designed interior trim element of a motor vehicle.
- the curvatures desired for acoustic reasons can also be used as a design element of the interior trim.
- FIG. 1 shows a first embodiment of a plate loudspeaker according to the invention with a one-dimensionally curved plate
- FIG. 3 shows a third exemplary embodiment of a plate loudspeaker according to the invention with a two-dimensionally curved plate
- Fig. 4 shows a fourth embodiment with a two-dimensionally curved plate
- Fig. 5 shows a fifth embodiment with a plate with an anisotropic natural shape.
- Fig. 1 is a rectangular plate 1 with a length-width ratio of
- the curvature is designed such that, starting from a zero position 9 predetermined by the planar plate, it is curved perpendicular to the plate surface in both the positive and negative directions.
- the course of the bend 2 with respect to the zero position 9 thus has negative and positive amplitudes. For example, at the points with the largest negative (10) and the largest positive (11) deviation from the zero position 9 driver attached to the plate 1, then they are operated in phase opposition to each other.
- the drivers are not shown in the drawing for clarity.
- FIG. 2 again shows a rectangular plate 4 with a length-width ratio> 1.
- the plate 4 is curved in a direction perpendicular to the longitudinal direction.
- the plate 4 consists of identical profile sections 12 seamlessly strung together, which are glued together, for example, at the seams.
- the radius of curvature 3 is at least of the same order of magnitude as the associated edge length.
- FIG. 3 shows a rectangular plate 13 with a length-to-width ratio> 1, which has a curvature course both in the longitudinal direction and perpendicular to it with curvatures both in the negative and in the positive direction around a zero position 14 (corresponding to a planar plate ) having.
- the course of curvature in the longitudinal direction is wave-like, while the course transverse to the longitudinal direction in the central part of the plate 13 is hump-like.
- all radii of curvature are at least of the same order of magnitude as the edge lengths.
- the plate used in the exemplary embodiment according to FIG. 4 has a circular base area and is curved in such a way that it has an approximately spherical shape.
- the plate 15 has a low mass and is arranged in a sealed holder 6, mainly in a self-supporting and low-damping manner, in such a way that it can be excited by a driver (not shown in the drawing) to bending waves that are re-selected many times (multi-resonance sound plate).
- the plate itself consists of non-identical profile sections 5 which are seamlessly strung together, with all radii of curvature of at least equal
- Segments is put together that a cylinder is created, which can then be used as an all-round emitter for various room sound systems. Panels can also be assembled from segments into a spherical emitter.
- FIG. 5 shows a three-dimensional shape variant.
- a flat honeycomb of rectangular original shape as the core of a future sandwich panel assumes a natural shape characterized by anisotropy of the elastic constants of the honeycomb, the first mode of which is shown in FIG. 5.
- the four edges 66 and 77 have the same sign of the curvature.
- a central zone bounded by four non-curved neutral fibers 88 and 99 has opposite signs of curvature throughout. Even if the corners are cut off or rounded off, this behavior remains.
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2001/000858 WO2002060218A1 (de) | 2001-01-26 | 2001-01-26 | Plattenlautsprecher |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1264511A1 true EP1264511A1 (de) | 2002-12-11 |
Family
ID=8164263
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01271809A Withdrawn EP1264511A1 (de) | 2001-01-26 | 2001-01-26 | Plattenlautsprecher |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1264511A1 (de) |
WO (1) | WO2002060218A1 (de) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9818959D0 (en) * | 1998-09-02 | 1998-10-21 | New Transducers Ltd | Panelform loudspeaker |
GB9705979D0 (en) * | 1997-03-22 | 1997-05-07 | New Transducers Ltd | Passenger vehicles |
US6356641B1 (en) * | 1996-09-25 | 2002-03-12 | New Transducers Limited | Vehicular loudspeaker system |
JP2972857B2 (ja) * | 1997-02-26 | 1999-11-08 | 防衛庁技術研究本部長 | 屈曲振動型送受波器アレイ |
GB9911271D0 (en) * | 1999-05-15 | 1999-07-14 | New Transducers Ltd | Acoustic device |
-
2001
- 2001-01-26 WO PCT/EP2001/000858 patent/WO2002060218A1/de not_active Application Discontinuation
- 2001-01-26 EP EP01271809A patent/EP1264511A1/de not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO02060218A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2002060218A1 (de) | 2002-08-01 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20020621 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
17Q | First examination report despatched |
Effective date: 20031112 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: BACHMANN, WOLFGANG Inventor name: ZIGANKI, ANDREAS Inventor name: REGL, HANS-JUERGEN Inventor name: KRUMP, GERHARD |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20040709 |