EP2143299A1

EP2143299A1 - Membrane or membrane arrangement for an electrodynamic sound transducer, and loudspeaker comprising such a membrane or membrane arrangement

Info

Publication number: EP2143299A1
Application number: EP08749264A
Authority: EP
Inventors: Raimund Mundorf
Original assignee: Mundorf EB GmbH
Current assignee: Mundorf EB GmbH
Priority date: 2007-05-02
Filing date: 2008-04-30
Publication date: 2010-01-13
Anticipated expiration: 2028-04-30
Also published as: DE112008001166A5; ATE543344T1; EP2143299B1; DE102007020847A1; US8208678B2; US20100098271A1; WO2008135221A1; ES2380273T3; DE102007020847B4

Abstract

A membrane for an electrodynamic sound transducer, particularly a membrane for an AMT loudspeaker, has a meandering shape and is disposed in an air gap between two pole plates. The membrane has a plurality of opposite flanks and a plurality of wave crests and/or wave troughs. In order to avoid parasitic oscillations, at least one supporting element is provided which stabilizes the position and/or the orientation of at least one wave crest and/or wave trough.

Description

Membrane or membrane arrangement for an electrodynamic sound transducer or loudspeaker with such a membrane or

Membrane configuration "

The invention relates to a membrane for an electrodynamic sound transducer, in particular loudspeaker membrane for a loudspeaker, in particular for a surface radiator, vzw. an AMT speaker, the membrane - in the installed state - is substantially meander-shaped, vzw. can be arranged in an air gap provided between two pole plates, wherein the membrane has a plurality of vzw. has opposite flank sides and a plurality of wave crests and / or troughs and wherein along the plurality of flank sides conductor tracks are provided. Furthermore, the invention relates to a speaker with such a membrane or membrane assembly.

Membranes for electrodynamic sound transducers are already known in the prior art from a plurality of publications (DE OS 2 003 950). Such diaphragms for electrodynamic sound transducers can be used in different sound transducers, for example in loudspeakers, but also in microphones, headphones and the like. Here, the membrane has oscillatory membrane parts, namely opposite flank sides or adjacent flank sides and / or wave flanks connected to these flank sides Troughs on, which are formed due to this structure tight air pockets. These air pockets are alternately closed and opened for pressing or sucking in the air, vzw. for generating corresponding sound waves. For this purpose, the membrane is in operative connection with a suitable device. The membrane itself has along the edge sides conductor tracks, wherein the membrane in an applied Magnetbzw, electrostatic field, vzw. is arranged in an air gap between two pole plates. If electric current now flows, in particular corresponding alternating current signals through the strip conductors, this can cause the edge sides to oscillate, so that the air pockets formed by the flank sides are closed or opened in order to generate corresponding sound waves or a sound pressure. Such membranes can therefore be used for Speakers are used, but is also conceivable - the reverse case, namely - the use of microphones or the like ..

Such diaphragms and their functional principle are already known from a large number of publications (for example, also from DE 202 07 154 U1) and such diaphragms are used in particular in the so-called AMT loudspeakers C.AirMotion- Transformer "based on the developments of Dr. Oskar Heil) The basic principle is essentially always the same, whereby a meandering or concertina-like folded membrane, on which correspondingly arranged conductor tracks are located, is used "Permanent magnetic field" arranged close or open the membrane folds or the air pockets of the membrane when vzw. an alternating current flows through the strip conductors, wherein the air is forced out or sucked out of the air pockets. So-called "Air Motion Transformers" are characterized by excellent impulse response and high efficiency due to the very small moving masses. Air Motion Transformers are used in hi-fi loudspeakers as tweeters in the frequency range of about 1 kHz to max about 25 kHz used.

1 shows, in a schematic representation, a membrane 1 already known in the prior art for an electrodynamic sound transducer not shown in detail here, in particular a loudspeaker diaphragm for a loudspeaker. The here meander-shaped membrane 1 takes this form essentially in their operating state, which then vzw. is arranged between two pole plates in an air gap. In the production of the membrane is first processed as a sheet-like element, wherein the corresponding here recognizable traces 2 vzw. be formed on the membrane via appropriate known etching. Clearly visible here are a plurality of wave crests 3 and troughs 4 and the individual peaks 3 and troughs 4 interconnecting and opposite flank sides 5, on which the tracks 2 - as shown - are provided. As can be clearly seen from Fig. 1, a plurality of air pockets 6 are formed by this arrangement. By appropriate arrows 1 indicates a current I flowing here via the printed conductors 2 and a magnetic field represented here by the arrows B, in particular an electrostatic magnetic field.

The mode of action of the membrane 1 known in the prior art is now shown schematically, in particular in FIGS. 2 and 3. While FIG. 1 shows the "normal position", FIGS. 2 and 3 show the corresponding movements of the membrane for comparison purposes, with the solid lines now showing the state of the membrane 2 and the air tats 6, respectively depending on the respective different current directions and in each case in dashed lines the "normal position" of the membrane 1, when no current flows.

Thus, FIG. 2 shows, for a first current direction, that the side flanks 5 of the membrane 1 move in accordance with the direction of the current in each case in accordance with the arrows C 1, namely in such a way that the air pockets 6 a, 6 b, 6 c and 6 d increase in width , so that air can be sucked into these air pockets 6a to 6d according to the arrows E according to. On the other hand, the air pockets 6e, 6f and 6g decrease correspondingly in their width, so that here according to the arrows A, the air is forced out of these pockets. (Arrows A: air outlets, arrows E: air intake).

Fig. 3 shows the membrane 1 and its movement in the reversal of the flow direction shown in Fig. 2, namely the movement of the edge sides 5 in the corresponding reverse direction according to the arrows C2. Good to see here is that the air pockets 6a, 6b, 6c and 6d now narrow accordingly, so that the air is pushed out of these pockets 6a to 6d (arrows A) and the air pockets 6e, 6f and 6g have widened accordingly, so that the air is sucked into these air pockets 6e, 6f and 6g accordingly (arrows E).

1 to 3 therefore show the known in the prior art operation of a membrane 1 for an electrodynamic transducer. It becomes clear that in the case of such membranes 1, the opposing flank Pages 5, each defining an air pocket 6, on the one hand toward each other, on the other hand move away from each other. The flank sides 5 directly adjacent to a specific air pocket on the right and left thus always move in the opposite direction to these respective air pockets enclosed by the flank faces. As a result, the corresponding air pockets 6a to 6g are correspondingly narrowed or widened, so that by these movements, the air located between the flank sides 5 either pressed out or - in the countermovement - is sucked in accordance with, as shown in FIGS. 2 and 3.

Investigations have shown, however, that in addition to the desired movement of the flank sides, the membrane also carries out a whole series of undesired additional movements, in particular namely that the flank sides are not displaced laterally parallel to one another as would be desired.

Thus, FIG. 4a initially shows here in schematic representation a section of a membrane, namely a wave crest 3 from above in a dashed representation (rest position) and, during operation, the movement of the flank sides or the correspondingly moved wave crest "3" It is easily recognizable that the moving wave crest 3 here has a curvature, that is, the lower and upper end regions are deflected less laterally than the middle region.

Thus, Fig. 4b shows in a very simplified schematic representation as individual lines, the "axles of the Wellenberg ridge 3a" in the rest position (dashed line) and their relative movement to each other with the solid lines.The rest position of the Wellenberg ridge 3a is in each case with the As can clearly be seen, during its movement, ie its lateral movement in the transverse direction in the case of the membrane 1 clamped here, the axis lines of the wave-valley ridges 4a are also schematically shown The membrane still a whole set of unwanted additional resonant frequencies, resulting in additional movements of the flank sides and thus Also, in particular, can lead to a relative movement of the individual Wellenberg backs 3a and wave trough backs 4a, which is very unfavorable. This results in nonlinearities in the frequency response and distortions of the original signal.

Also - which is not shown here - the Wellenberg backs 3a and wave backs 4a in the vertical direction correspondingly vibrate irregularly, so that in addition, these vibrations further burden the system and / or distort, which in turn to nonlinearities in the frequency response and Distortions of the original signal may result.

The invention is therefore based on the object, the above-mentioned membrane, or a membrane assembly and / or an electrodynamic transducer, in particular a speaker from which the invention goes out, so design and further that unwanted membrane vibrations are avoided, in particular the above-described effects are significantly prevented.

The object indicated above is now achieved by additionally providing at least one element which stabilizes the position and / or the orientation of at least one wave crest and / or wave trough. The fact that now a stabilizing element, vzw. a stiffening element or a support element, vzw. a plurality of stiffening elements or a plurality of supporting elements are provided, which stabilize the position and orientation of the wave crests and / or troughs, in particular during operation, the irregular oscillations of the membrane, in particular the unwanted vibrations of the Wellenberg back or wave trough back and thus the flank sides are avoided in the lateral and / or vertical direction. As a result, nonlinearities in the frequency response and distortions of the original signals are eliminated, so that an electrodynamic transducer in which a membrane according to the invention is provided has decisive acoustic advantages and is decisively improved. The disadvantages mentioned above are therefore avoided and achieved corresponding advantages. There are now a variety of ways to design the membrane of the invention in an advantageous manner and further. For this purpose, reference may first be made to the claims subordinate to claim 1. In the following, several exemplary embodiments of the invention will now be explained in more detail with reference to the following drawing and the associated description. In the drawing shows:

1 is a schematic representation of the structure of a known in the prior art membrane,

2 shows the membrane of FIG. 1 in a schematic representation from the side with the movements of the side edges in each case in a first direction,

1 shows a schematic representation of the membrane from FIG. 1 with movements of the side flanks, in each case in a second, opposite direction, FIG.

4a and 4b are schematic illustrations of the unwanted vibrations of a membrane or the deflection of the flank sides or the wave crest-back of a membrane in operation,

5a and 5b first, slightly different embodiments for a membrane according to the invention in a schematic perspective view,

6 shows a second embodiment of an inventive membrane arrangement or training in a schematic perspective view,

7 is a schematic representation of the membrane shown in FIG. 6, 8 is a schematic representation of a third embodiment of a membrane arrangement according to the invention in a schematic side view,

9 shows a fourth exemplary embodiment in a schematic representation for a membrane arrangement according to the invention similar to that of FIG. 8,

10 is an enlarged schematic representation of a detail of FIG. 8 and FIG. 9, namely in an enlarged schematic representation of a corresponding stabilizing support element,

11 is a schematic side view of a fifth embodiment of a membrane arrangement according to the invention,

12 is a schematic top view of a frame for the membrane arrangement according to the invention from FIG. 11, FIG.

13 is a schematic side view of a sixth exemplary embodiment of a membrane arrangement according to the invention,

14 is a schematic representation from above of a frame for the inventive membrane arrangement of FIG. 13,

15 shows a seventh exemplary embodiment of a membrane arrangement according to the invention,

16 is a schematic representation of an eighth embodiment of a membrane arrangement according to the invention,

17 is a schematic representation of a ninth embodiment of a membrane arrangement according to the invention, 18 shows a loudspeaker in a schematic illustration from the side with the recesses which can be recognized here and the membrane arranged behind it and not shown here,

19 shows a further exemplary embodiment of a membrane or membrane arrangement according to the invention in a schematic perspective illustration, and

Fig. 20 schematically shown in Fig. 19 membrane or membrane arrangement arranged between two pole plates in a schematic

Presentation of the page.

FIGS. 5 to 20 show - at least partially - a membrane 1 according to the invention or a membrane arrangement according to the invention for an electrodynamic transducer, not shown here in detail.

The membrane 1 is vzw. designed as a speaker diaphragm and in a loudspeaker, vzw. provided in an AMT loudspeaker, which is shown schematically in Fig. 18. Also conceivable is the arrangement of such a membrane 1 in a microphone or in a headphone or the like, depending on the application.

In the installed state, in particular arranged in a corresponding device, the membrane 1 is formed substantially meander-shaped, as in particular in Figs. 5 to 9, 11, 13 and 15 to 17 in a schematic representation recognizable. In the event that the membrane 1 is designed as a speaker diaphragm, this is vzw. is arranged between two pole plates 7 and 8 in an air gap 9 provided between the two pole plates 7 and 8, as shown particularly clearly in FIGS. 8, 9, 11 and 15 to 17, 19 and 20, respectively.

As FIGS. 5 to 17 show, in part, clearly, the membrane 1 has a plurality of opposite flank sides 5 and a plurality of wave crests 3 and wave troughs 4. Here, essentially, there is see two adjacent wave crests 3 a wave trough 4 and between two adjacent troughs 4 each a wave crest 3, so that the corresponding "accordion shape" as shown in the figures, arises.

Furthermore, on the flank sides 5 vzw. two conductor tracks 2 provided in each case, the vzw. be traversed by the alternating current. It is also conceivable one or three tracks. Depending on the respective current direction or activation and the orientation of the applied "permanent magnetic field", or of the electrostatic magnetic field, the edge sides 5 of the membrane 1 then move toward one another or away from one another substantially in the transverse direction (X direction) means that two opposite flank sides 5, each of which delimits an air pocket 6, either move towards or away from each other in the corresponding transverse direction (X direction), so that the air pockets 6 either suck in or squeeze out air, the wave crests 3 or Wave troughs 4 are arranged or extend substantially in the axial direction (Y direction, longitudinal direction), as shown.

The above-mentioned disadvantages are now avoided by additionally providing at least one element 10 which stabilizes the position and / or the orientation of at least one corrugated edge 3 and / or wave trough 4. The stabilizing element (10) or vzw. the stabilizing elements (10) can now be designed differently. Vzw. the stabilizing element (10) is designed as a strip-shaped stiffening element (10a) or as a supporting element (10b or 10c, 10d, 10e, 10f), which will be explained below. Due to the arrangement or design of a corresponding element 10 vzw. directly on the membrane 1 or within a specific membrane arrangement, which will be described in more detail below, now the disturbing curvatures / oscillations of the flank sides 5 or the wave crests 3 and wave troughs 4 explained in the introduction are avoided during operation. There is therefore a uniform oscillation of the flank sides 5, so that the individual flank sides 5 move substantially parallel to each other or away from each other and in particular the wave crests 3 and troughs 4, namely in particular the axial and / or vertical orientation of the Wellenberg back 3a or wave trough back 4a their location and / or alignment is maintained substantially during operation of the membrane 1 and so the whole vibration system is stabilized. The disadvantages mentioned above are therefore avoided and achieved corresponding advantages.

There are now different ways to design and further develop the corresponding stabilizing element 10 or to arrange accordingly on a membrane 1 or to design a corresponding membrane arrangement such that the aforementioned objectives are achieved. The corresponding embodiments may now be described in more detail below with reference to the drawing.

Fig. 5a shows the membrane 1 in a schematic representation as well as in the other representations as a simple solid dashed line with the conductors arranged thereon 2. It is here vzw. a respective stiffening element 10a is provided for each corrugation 3 and for each corrugation 4 as a stabilizing element 10 which is strip-shaped (and could also be called a "support element".) The strip-shaped stiffening elements 10a are in the axial direction in the region of The strip-shaped stiffening elements 10a are preferably made of aluminum 4. The stiffening elements 10a are therefore particularly accurate on the respective axial center lines of the wave crests 3 and wave troughs 4, respectively The corresponding position and / or orientation of the wave crests 3 and wave troughs 4 are accordingly stabilized in a corresponding manner on the respective wave crest backs 3a or on the respective wave crests 4. A lateral non-parallel oscillation of the side flanks 5 relative to each other becomes therefore avoided because the position and / or orientation of the wave crests 3 or wave troughs 4 is stabilized.

As already mentioned, the strip-shaped stiffening elements 10a vzw. designed as aluminum strips, where vzw. each wave crest 3 and each wave trough 4 has a corresponding stiffening element 10a. Vzw. can the strip-shaped stiffening elements 10 a similar to the conductor tracks 2 are produced, vzw. via appropriate etching on a Membrane 1 are formed in a corresponding arrangement, so that the then first flat membrane for operation 1 only needs to be folded accordingly, as shown in Fig. 5a.

The stiffening elements 10 a, the vzw. are formed as aluminum strips, have a higher modulus of elasticity than the material of the membrane 1 itself, d. H. The stiffening elements 10a thus have a higher rigidity than the material of the membrane 1, so that stiffened / reinforced by the arrangement of these stiffening elements 10a on the respective Wellenberg back 3a and wave back 4a, this area of the membrane 1, which previously mentioned advantages.

Fig. 5b now shows a further embodiment, which differs slightly from the embodiment shown in Fig. 5a. Good to see again here is the only line-shaped membrane 1, the respective air pockets 6, the tracks 2 and the wave crests 3 and troughs 4 and Wellenberg-back 3a and wave trough back 4a. 5, stiffening elements 10a are provided as stabilizing elements 10, but in the area of the wave crests 3 or shaft valleys 4 a plurality of stiffening elements 10a extending in the axial direction are arranged parallel to one another, here vzw. in each case three stiffening elements 10a in the region of a wave crest 3 or wave trough 4, in particular on a wave crest back 3a or on a wave crest back 4a, as shown in FIG. 5b. Vzw. the respective stiffening elements 10a are in turn made strip-shaped, parallel to each other, but are formed as separate elements. This arrangement has over the arrangement shown in Fig. 5a the advantage that the mobility of the membrane 1 in the arc region, ie in the region of the respective wave crest 3 and the respective wave trough 4 largely retained and at the same time stabilization of this region is achieved , Also conceivable are only two stiffening elements 10a arranged parallel to one another on a respective wave crest 3 or wave trough 4 or, for example, four stiffening elements 10a arranged parallel to one another, depending on the particular application, the size, dimensioning and design of the respective membrane 1 or the wave crests and / or valleys 3 or 4 and the width of the respective stiffening elements 10a.

FIGS. 6 and 7 now show other embodiments of a stabilizing element 10, namely supporting elements 10b. Clearly visible here is that the membrane 1 is arranged in a kind of frame 11, wherein of the frame 11 here only two lateral elements IIa and IIb are shown or even these two lateral elements lla / llb must be provided, depending on the application , The support elements 10b are here now formed and / or arranged so that the - located in the transverse direction of the membrane 1 and adjacent wave crests 3 or troughs 4 and the lateral frame parts IIa and IIb are effectively connected to each other. As shown in FIG. 6, two vzw are on top of this arrangement. strip-shaped running support elements 10b (substantially in the x direction) arranged as well as on the bottom also vzw. two support elements 10b are arranged, as shown in FIG. 7 can be seen.

The apparent here from Figs. 6 and 7 supporting elements 10b are vzw. partially elastic, in particular in order to be able to join in the slight vertical up and down movements of the wave crests 3 or wave troughs 4. The support elements 10b are vzw. formed as an elastic grid element and have a net-like structure, in particular made of fly screen or linen. Vzw. the support elements 10b are glued to the corresponding locations of the frame parts IIa and IIb and to the corresponding areas of the wave crests 3 and wave troughs 4. The fact that the corresponding wave crests 3 or wave troughs 4 (depending on the view at the top or bottom in the arrangement shown in FIGS. 6 and 7) are now laterally connected to the frame part IIa and IIb, the position and / or orientation of the individual peaks 3 or wave troughs 4, in particular the Wellenberg- back 3a and Wei- lental-back 4a stabilized accordingly, which in turn brings the advantages explained above with it.

FIG. 8 now shows a membrane 1 or a membrane arrangement, the membrane 1 in this case corresponding between two pole plates 7 and 8 in an air gap 9. is arranged. The frame 11 for the membrane or the lateral frame parts IIa and IIb are also clearly visible.

8, 9 and 10 now show an embodiment of a support member 10, namely a support member 10c, which is rod-shaped and substantially in the inner lower portion of an air pocket 6, here in Fig. 8 in the axial direction on the inner region of a Wellenberg 3 runs or glued or arranged here with the membrane 1. The support member 10c is rod-shaped and vzw. from a metal, vzw. Iron made.

On the opposite side of the membrane 1, a web element 12 is then arranged opposite the support element 10c, which here, like FIGS. 8 to 10, has a substantially rectangular cross-section. The web element 12 - as FIG. 8 shows - is arranged on a pole plate 7. In operation, that is, when a magnetic field, in particular an electrostatic magnetic field, as shown in Fig. 1 by the arrows B, applied, the rod-shaped support member 10 c is then pressed against the web member 12 due to a magnetic effect, so that the membrane. 1 , in particular here in FIG. 8, the corrugation ridge 3a is fixed accordingly, that is, the position and orientation of the corrugation ridge 3a is stabilized. For this purpose, the web element 12 vzw. Also, a corresponding groove, so that at the corresponding contact a lateral support of the support member 10c is ensured, as shown schematically in Fig. 10.

Referring now to FIG. 9, vzw. for each wave crest 3 and 4 corresponding support elements 10c provided for each shaft part. Corresponding to this, respective web elements 12 are provided on the respective pole plates 7 and 8 so that, in the arrangement shown in FIG. 9, each corrugation 3 and each corrugation 4 and each corrugation 3 a and each corrugation 4 b in the Operation is aligned or fixed accordingly.

It is also conceivable that the support elements 10c are formed part-rod-shaped, so not necessarily over the entire axial length (Y-direction, longitudinal direction) of the membrane 1 must extend, but only via appropriate Subareas, this depends on the particular application. Also other cross-sectional shapes, so not only round cross-sectional shapes, but vzw. Cross-sectional shapes that do not hinder the movement of the side edges 5 are conceivable for the support elements 10c.

Vzw. the web elements 12 are made of a thermally conductive material, which positively affects the properties of the membrane 1 and on the support elements 10c can also develop a magnetic effect (orientation).

11 and 12 now show a membrane 1 and a membrane arrangement, wherein the membrane 1 between two pole plates 7 and 8 in an air gap 9, is arranged. Fig. 12 shows a corresponding frame 11 schematically in plan view. Good to see here is the support element 10d, the vzw here. is designed as a support profile. In other words, the support member 10d is formed as part of the frame 11 and acts on the diaphragm 1 as shown in FIG.

11, so that here in the illustration in Fig. 11, the wave crest 3, namely the wave crest back 3a is well positioned or fixed in its orientation. Therefore, when the diaphragm 1 is clamped in the frame 11 and the support member 10d extending in the axial direction (Y direction) is provided, the diaphragm 1 can be arranged so that the support member 10d formed as a support profile is provided in the region between two flank sides 5 and with at least one subregion in contact with the respective wave crest 3 for its stabilization, as shown in FIG. 11.

Vzw. are then provided as support profiles trained support elements 10d, as shown in FIGS. 13 and 14. In other words, the frame 11 has vzw. a plurality of extending in the axial direction (Y direction) supporting elements 10d, which serve to stabilize the meandering membrane 1 and are formed so that they see within the Luftta- 6 corresponding to the wave crests 3 and troughs 4 for their fixation, location / Alignment can be arranged or here respectively on the inner surfaces, vzw. under bias, come to rest and / or come from a particular movement of the membrane 1 to the plant. Figs. 15 to 17 show a further embodiment of a support member 10 and a corresponding membrane arrangement between two pole plates 7 and 8. Arranged - as before - the corresponding membrane 1 vzw. within a frame 11 or within frame parts IIa and IIb. Again, as shown in Fig. 15, a web element 12 is also provided here. The membrane 1, in particular here provided for the wave crest 3 supporting element 1Oe is now vzw. "Sword-shaped", which means that it extends substantially over the entire air pocket 6 to the other pole plate 8 and is fastened here, again in Fig. 15, the wave crest 3 and the wave crest back 3a through the sword-shaped support member 10e and lying on the opposite side of the membrane 1 web element 12 is fixed or aligned accordingly.

As FIGS. 16 and 17 show, a plurality of web elements 12 and also a plurality of sword-shaped support elements 10e can be provided here. This depends on the particular application and the manner of the necessity of the number of support elements 10 to be provided.

Finally, Fig. 18 shows a schematic representation of a speaker 13 from the front with outlet openings 14, behind which the corresponding membrane 1 is arranged.

FIGS. 19 and 20 show a further embodiment of a support element 10, namely a grid-shaped support element 10f, as shown clearly in FIG. The grid-like support member 10 f, as shown in FIGS. 19 and 20, vzw. designed such that it has individual strip-shaped elements which extend substantially parallel to the corresponding wave crests 3. As FIG. 20 shows, the lattice-shaped support element 10f is then arranged in the region of a pole plate 7 in such a way that the wave crests 3, in particular the wave crests 3a with the lattice-shaped support element 10f over vzw. a thermally conductive adhesive and / or plastic can be connected together or are connected. FIG. 19 shows the arrangement of the latticed support element 10f with the adhesive area or plastic area 15, with the aid of which the lattice-shaped support element 10f is connected here to the wave crests 3. Vzw. the grid-shaped support element 10f is also made of a thermally conductive material.

As FIGS. 19 and 20 show, corresponding spacers 16 are also provided on the frame parts IIa and IIb in order to realize the arrangement according to FIG. 20, in particular the pole plate 7 does not have recesses in detail here, in detail. in which the grid-shaped support member 10f arranged or can be glued here. It is also conceivable, of course, that a second additional support element is provided not only on the pole plate 7, but also in the region of the pole plate 8 for the wave troughs 4, which is not shown here. Furthermore, the support element 10f can also be held by a magnetic force on the pole plate 7.

It can be seen that the membrane 1 according to the invention or the membrane arrangements described can be used in different electrodynamic sound transducers, in particular in loudspeakers, microphones or the like.

LIST OF REFERENCE NUMBERS

1 membrane

2 tracks 3 Wellenberg

3a wave mountain ridge

4 wave valley

4a wave-valley back

5 flank sides 6 air pocket

6a air pocket

6b air bag

6c air pocket

6d air pocket 6e air pocket

6f air pocket

6g air pocket

6h air pocket

7 pole plate 8 pole plate

9 air gap

10 Stabilizing element

10a strip-shaped stiffening element

10b strip-shaped support member 10c rod-shaped support member 1Od support element / support profile

10e sword-shaped support element

1Of grid-shaped support element

11 Frame I Ia lateral frame part

IIb side frame part

12 bar element

13 speakers

14 outlet opening 15 adhesive / plastic

16 spacers

I electricity

B arrows, magnetic field Ci, 2 arrows, moving sidewalls

A air outlet

E Air intake

Claims

claims:

1. membrane (1) and / or membrane arrangement for an electrodynamic sound transducer, in particular loudspeaker membrane for a loudspeaker

(13), in particular for a surface radiator, vzw. an AMT speaker, wherein the membrane (1) - in the installed state - is substantially meander-shaped, vzw. in an air gap (9) provided between two pole plates (7, 8) can be arranged, wherein the membrane (1) a plurality of vzw. having opposite flank sides (5) and a plurality of wave crests (3) and / or troughs (4), and wherein along the plurality of flank sides (5) conductor tracks (2) are provided, characterized in that additionally at least one of the position and or the alignment of at least one wave crest (3) and / or whale valley (4) stabilizing element (10) is provided.

2. membrane or membrane assembly according to the preceding claim, characterized in that the stabilizing element (10) is formed and / or arranged so that the individual edge sides (5) are always substantially exactly parallel to each other or from each other move away and the wave crests (3) and the troughs (4), namely the axial alignment of the Wellenberg back (3a) or wave trough back (4a) their position and / or orientation during operation of the membrane (1) in Maintained.

3. membrane or membrane arrangement according to one of the preceding claims, characterized in that the element (10) as a strip-shaped stiffening element (10 a) or as a support element (10 b, 10 c, 10 d, 10 e or 1 o f) is formed.

4. membrane or membrane arrangement according to one of the preceding claims, characterized in that the strip-shaped stiffening element (10 a) in the axial direction in the region of the wave crest (3), in particular of the crest ridge (3 a) or in the region of the wave trough (4), in particular of the wave trough back (4a) is arranged.

5. membrane or membrane arrangement according to one of the preceding claims, characterized in that the stiffening element (10 a) is designed as an aluminum strip.

6. membrane or membrane arrangement according to one of the preceding claims, characterized in that each corrugation (3) and each trough (4) has a stiffening element (10a) or more parallel to each other arranged stiffening elements (10a).

7. membrane or membrane arrangement according to one of the preceding claims, characterized in that the membrane (1) in a frame (11, IIa, IIb) is arranged.

8. Membrane or membrane arrangement according to one of the preceding claims, characterized in that the support element (10b) is formed and / or arranged such that the - in the transverse direction of the membrane (1) located adjacent - wave crests (3) or Troughs (4) and the lateral frame parts (IIa, IIb) are functionally effectively connected to each other.

9. membrane or membrane arrangement according to one of the preceding claims, characterized in that the support element (10b) is formed at least partially elastic, vzw. has a net-like structure, in particular made of fly screen or linen is made.

10. Membrane or membrane arrangement according to one of the preceding claims, characterized in that the membrane (1) is arranged in a see between two pole plates (7, 8) provided air gap (9).

11. Membrane or membrane arrangement according to one of the preceding claims, characterized in that the support element (10c) is designed as a movable - at least partially - rod-shaped element.

12. Membrane or membrane arrangement according to one of the preceding claims, characterized in that the support element (10c) in the region of a wave crest (3) or in the region of a wave trough (4) relative to one of the pole plates (7, 8 ) arranged web element (12) is provided in such a way and / or extends in the axial direction of the wave crest (3) or the wave trough (4), so that - in operation - the Wellenberg back (3a) or the wave trough back ( 4a) of the membrane (1) between the support element (10c) and the web element (12) comes to rest or by its position / orientation is fixed.

13. Membrane or membrane arrangement according to one of the preceding claims, characterized in that a plurality of rod-shaped support elements (10c) and corresponding thereto, on the respective pole plate (7, 8) arranged web elements (12) are provided.

14. Membrane or membrane arrangement according to one of the preceding claims, characterized in that the web element (12) has a groove-shaped groove for the realization of the lateral support of the support element (10c).

15. Membrane or membrane arrangement according to one of the preceding claims, characterized in that the web element (12) or the web elements (12) is made of a thermally conductive material or are.

16. A membrane according to any one of the preceding claims, characterized in that the membrane (1) in a frame (11) is clamped and the frame (11) has at least one substantially axially extending fend- fendes support member (1Od).

17. Membrane or membrane arrangement according to one of the preceding claims, characterized in that the support element (1Od) is designed as a support profile (10c).

18. Membrane or membrane arrangement according to one of the preceding claims, characterized in that the membrane (1) is formed and / or arranged or the support profile (1Od) is formed and / or arranged, so that the support profile (1Od) in the region between two side edges (5) is provided and with at least a portion of the wave crest (3), in particular with the wave crest back (3a), or with a portion of the wave trough (4), in particular the wave trough back (4a) is in contact with its stabilization.

19. membrane or membrane arrangement according to one of the preceding claims, characterized in that a plurality of support profiles (1Od) are provided.

20. Membrane or membrane arrangement according to one of the preceding claims, characterized in that the support element (1Oe) is formed sword-shaped and connected at one end to a pole plate (7, 8), wherein the other end of a web element (12) opposite such that a wave crest (3), in particular a wave crest back (3a), or a whale valley (4), in particular a wave crest back (4a) between the bridge element

(12) and support element (10e) is fixable.

21 membrane or membrane arrangement according to one of the preceding claims, characterized in that a plurality of web elements (12) and a plurality of sword-shaped support elements (10 e) are provided.

22. Membrane or membrane arrangement according to one of the preceding claims, characterized in that the support element (1Of) is formed in a grid shape.

23. Membrane or membrane arrangement according to one of the preceding claims, characterized in that the lattice-shaped support element (1Of) has a plurality of longitudinally extending elements which correspond to the wave crests (3) or troughs (4) are formed.

24. Membrane or membrane arrangement according to one of the preceding claims, characterized in that the support element (1Of) with the aid of an adhesive / plastic region (15) with the wave crests (3) or troughs (4) is operatively connected effectively and / or by means of the spacers (16) is connected to a frame (11, IIa, IIb).

25. Loudspeaker, in particular an AMT loudspeaker with a membrane (1), characterized in that at least one membrane (1) or a membrane arrangement according to one of claims 1 to 24 provided and / or arranged.