EP2193666B1 - Broadband exciter - Google Patents

Description

The present invention relates to a broadband exciter. In particular, the invention relates to an exciter capable of generating sonic vibrations at frequencies from 0 Hz to more than 80 kHz.

State of the art

Exciter, shaker, bending wave loudspeakers or loudspeakers of the prior art can only reproduce sub-ranges of frequencies of a selected band, for example only infra-frequency (<16 Hz), sub-ranges of the audible frequencies (16 Hz to 16 kHz; - and low frequencies) or suprabrable frequencies (more than 16 kHz). Flexible wave loudspeakers have a mid / high range (MHT) of about 100 to 30,000 Hertz. Shakers can reproduce frequencies of approximately 5 to 100 Hz and subwoofers of approximately 5 to 1200 Hz. Consequently, exciters, shakers, flexible wave loudspeakers or loudspeakers must be combined to cover, for example, a frequency range of at least 16 Hz to 20 kHz necessary for the hi-fi range , A problem with a combination of different elements is that the upper or lower frequency ranges of the individual elements overlap, creating interference that requires technical or electronic correction. This correction means on the one hand an increased expenditure on equipment and on the other hand is not always ideal.

Furthermore, the achievable sound pressure in conventional speakers depends on the size of the membrane and the strength of the permanent magnet. Consequently, very large and heavy speakers must be designed to produce a high sound pressure, for example at concerts.

The WO 00/49835 discloses a dual cone speaker having a primary speaker cone and an axially offset from the primary secondary speaker cone, both of which are provided on the back of a magnetic structure. The primary and secondary speaker cone are rigidly connected together by a rod-shaped element. This connection improves the bass response of the speaker and enhances high-frequency reproduction.

The WO 97/09842 shows a speaker which is designed as a bending wave transducer, in which the sound radiation is realized by vibrating plates.
In conventional speakers, bending wave loudspeakers and Excitern finds a lifting movement for surface stimulation instead. Shakers and Basspumps perform a shaking movement, which, however, has no controlled longitudinal axis movement. However, since sound waves are generally not generated by mere strokes in nature, a highly lifelike reproduction of recorded sounds with conventional speakers, flexural wave loudspeakers, shakers or bass pumps can not be done.

Task and solution

Consequently, there is a need for an exciter that can cover a frequency spectrum of from 0 to more than 80 kHz, which is small and lightweight, and which allows the most lifelike reproduction of acoustic signals of all types with high efficiency.

This object is achieved by an exciter having the features of the main claim.

The overlap of the frequency ranges is understood to mean that the lowest frequency of the first continuous frequency range is higher than the lowest frequency of the second continuous frequency range, and that the highest frequency of the second continuous frequency range of the lowest frequency of the first continuous frequency range is equal to or greater than this and less than the highest frequency of the first continuous frequency range.

In addition, the first continuous frequency range constitutes a mid-high frequency range at the first end of the bar-shaped central element (mid and high-side, MHT side) and the second continuous frequency range provides a low-mid frequency range at the second end of the bar-shaped central element (low frequency). and midtone side, BMT side).

It is an essential feature of the present invention that the rod-shaped central element is caused to vibrate, and it contributes significantly to the sound emission of the broadband exciter. In particular, the exciter (in particular on the MHT side) serves as an excitation element for an ordinary speaker cone. At the second end of the central element (on the BMT side) it is fixedly connected to a vibrating surface (vibrating plate or loudspeaker diaphragm), for example via a screw connection (see detailed description below).

Furthermore, it should be noted that preferably the central element is made of a material whose elasticity properties can be adjusted so that decoupled at the first end medium-high-frequency vibrations can be emitted from the vibrations emitted at the second end. Vibrations not radiated at the first end can propagate to the second end where they contribute to the excitation of the low-mid frequency sound.

In particular, the broadband exciter may further comprise a disc-shaped member (22) connected to the second elastic member (41) and the rod-shaped central member (4) on the side of the second end of the rod-shaped central member (4), and wherein rod-shaped central element (4) through a concentric opening of the disc-shaped element (22). The rod-shaped central element is preferably by means of an external thread and a corresponding internal thread of the disc-shaped element (22) with this in a screw connection. By the disk-shaped element (22) is the second elastic element (41), e.g. may be integrally formed with that of a swing plate (such as a door, wall, etc.), to which the second end of the rod-shaped central element (4) may be attached, spaced. As a result, a free swinging of the second elastic element (41) is made possible with respect to the oscillating plate.

So that at least one of the elastic elements (40, 41) is designed in such a way that it excites torsional vibrations of the rod-shaped central element (4) (as well as of the magnetic element), the first and / or second elastic element can, for. B. be formed using not completely rotationally symmetric springs. for The torsional vibration can be transmitted to a vibration plate such as a door to which the rod-shaped central member (4) is attached. In combination with the vibration transmitted by the stroke oscillation of the central element, the vibration plate can thus be put in a shaking motion, in particular a spiral motion. It has surprisingly been found that the transmission of bass frequencies due to the additional torsional vibrations of the rod-shaped central element (4) is improved compared to the case of the pure stroke oscillation of the central element, that is, the power transmission is significantly increased.

The rod-shaped central element of the broadband exciter (100) according to the invention may have near its first end a disc-shaped plate (21) and the at least one voice coil, a coil carrier body (11) connected to the disc-shaped plate (21) of the rod-shaped central element (4) and at least one coil turn (10).

Furthermore, the broadband exciter (100) may comprise a concentric aperture permanent magnet (12) and a concentric aperture cover member (13) disposed in the aperture of the magnetic member (2), the central rod member (4 ) extends through the concentric openings of the permanent magnet (12) and the cover element (13), and the voice coil bobbin (11) of the at least one voice coil surrounds the cover element (13) and / or the permanent magnet (12).

In the above examples of the broadband exciter disclosed here (100), the rod-shaped central element (4) may be rotationally symmetrical about its longitudinal axis, in particular cylindrical.

Further details and advantages of the invention will be explained in the following detailed description.

Detailed description

• ein im Wesentlichen zylinderförmiges Zentralelement, welches in der Nähe eines Endes eine Platte aufweist,
• ein erstes ringförmiges Element, das einen ersten Hohlraum bildet,
• ein Magnetelement, das einen zweiten Hohlraum bildet,
• ein zweites ringförmiges Element, das einen dritten Hohlraum bildet,
• eine erste und eine zweite Feder in Kontakt mit dem ersten bzw. dem zweiten ringförmigen Element sowie
• ein scheibenförmiges Element in direktem oder indirektem Kontakt mit der zweiten Feder, wobei sich die erste Feder, das erste ringförmige Element, das Magnetelement, das zweite ringförmige Element, die zweite Feder und das scheibenförmige Element in dieser Reihenfolge befinden und in direktem Kontakt miteinander stehen können. Durch den ersten bis dritten Hohlraum, die zusammen einen gemeinsamen Hohlraum ergeben, erstreckt sich ein wesentlicher Teil des Zentralelements. Teile des Zentralelements ragen zu beiden Seiten aus dem ersten und dritten Hohlraum heraus.

In particular, the broadband exciter according to the invention according to the present invention may comprise in one embodiment:

• a substantially cylindrical central element having a plate near one end,
• a first annular element forming a first cavity,
• a magnetic element forming a second cavity,
• a second annular element forming a third cavity,
• a first and a second spring in contact with the first and the second annular element and
• a disc-shaped member in direct or indirect contact with the second spring, wherein the first spring, the first annular member, the magnetic member, the second annular member, the second spring and the disc-shaped member are in this order and can be in direct contact with each other , Through the first to third cavities, which together form a common cavity, a substantial part of the central element extends. Parts of the central element project on both sides out of the first and third cavities.

• mindestens einen Spulenträgerkörper sowie
• mindestens eine Spulenwindung,

wobei der Spulenträgerkörper an einem Ende in direktem Kontakt mit den Spulenwindungen und am anderen Ende in Kontakt mit dem Zentralelement steht und sich die mindestens eine Spule zumindest teilweise mit ihren Spulenwindungen im Inneren des mindestens einen im Magnetelement befindlichen zweiten Hohlraums befindet.Furthermore, the device according to the present invention comprises at least one coil comprising

• at least one coil carrier body as well
• at least one coil turn,

wherein the coil support body is in direct contact with the coil turns at one end and in contact with the central element at the other end and the at least one coil is at least partially with its coil turns inside the at least one second cavity in the magnetic element.

central element

The central element is rod-shaped. The diameter may vary within the central element, whereby, for example, a rotationally symmetrical structure with wave-like cross-section is obtained.

The central element has in the vicinity of one end a disc-shaped support plate, which may for example consist of the same material as the central element. The carrier plate is preferably circular, but may also have other shapes, such as an oval or a polygon. The carrier plate supporting end of the central element defined in the device according to the invention, the middle and high-pitched side (MHT side).

The central element on the one hand contributes to the generation of sound of the device according to the invention, but on the other hand also represents the supporting element of the device, because - as described below - carries the central element directly or indirectly all other elements of the device according to the invention.

MHT side of the central element

The central element may have an internal thread or external thread on the MHT side. This thread can affect the sound characteristics of the device according to the invention and allow attachment to an external support.

On the MHT side, the central element may further comprise a coupling device, for example an external thread. The device according to the invention can be mounted on this external thread on an external support so that it bears over the central element itself.

The disk-shaped support plate of the MHT side is located at a distance to the end of the MHT side, which still allows the presence of the coupling device. For example, the carrier plate is in the - viewed from the MHT side - first third to first quarter of the total length of the central element.

The carrier plate is connected to the first spring formed as a disc. This spring is in turn connected to the first annular element. This results in a substantially closed circular area defined by the disc-shaped support plate and the first spring.

The disc-shaped support plate gives the device stability and has an influence on the sound wave generation.

The connection of the carrier plate with the first spring is achieved, for example, and preferably by gluing. Adhesives are generally suitable adhesives that have neutral vibration properties. Silane-crosslinking polymers, rubber-like adhesives or chloroprene adhesives are suitable for this purpose. The adhesive can also provide for damping of unwanted natural oscillations of the device.

The connection of the spring with the first annular element can be done, for example, and preferably by gluing. Suitable adhesives also have the requirement profile defined above.

feathers

The springs can be made of a variety of materials or material mixtures. Preferably, the material is elastic, capable of oscillating, not brittle, of low weight, damping and vibration neutral. For example, they may be fabricated from fabric sheets based on carbon fibers or other hard tissue. But also possible is the production of metal or plastic.

The formed as a disk springs have recesses or slots. Preference is given to an even number of recesses, for example four or eight. The geometry and absolute and relative positioning of the recesses are chosen such that results in the overlap region of two recesses, for example, tongue-shaped spring leaf. Preferably, each of the recesses has three elements: an outer and an inner circular arc segment-shaped element and an element connecting the two circular arc segment-shaped elements. The connecting element connects the beginning or the end of the inner with the end or the beginning of the outer circular arc segment-shaped element. The configuration according to the invention of the recesses in the springs causes a simultaneous rotational movement of the central element during lifting movements of the springs parallel to the longitudinal axis of the central element.

Preferably, an even number of recesses is arranged rotationally symmetrically on a spring.

The first and second spring may be the same or different. They may differ with regard to the material used and / or with regard to the number and / or the geometry and / or the arrangement of the recesses and / or with regard to the material thicknesses. By combining different springs, the geometry of the generated vibration can be influenced. For example, on each side of the device according to the invention, mixed rotational and lifting oscillations, pure rotational or pure lifting oscillations of the magnetic element and of the central element can be generated independently of each other.

With the thickness of a spring, the resonant frequency of the device according to the invention can also be influenced.

BMT side of the central element

On the opposite side of the MHT side of the central element low and middle frequencies are delivered (BMT side). The storage of the central element takes place here by a circular recess in the center of the second spring.

On the outside of the second spring, a disk-shaped element is mounted centrally in direct or indirect contact, for example, glued, through which the central element is guided for amplification and sound wave generation. This element preferably has an inner center threaded through which the BMT side of the central element is screwed to ensure a secure connection of the individual components. Consequently, the BMT side of the central element preferably has an external thread, which on the one hand can have sound-wave-generating properties and, on the other hand, offers the possibility of fastening the device to an external support on its BMT side.

The disc-shaped element gives the device stability and also serves to generate sound waves.

ring elements

As stated above, the first spring is in contact with the first ring element. The second spring is likewise in contact with the second ring element. Both ring elements connect to the magnetic element.

The ring members of the present invention are solid rings of hard, vibration-neutral material. For example, pure metals, alloys or even plastics can be used. Suitable metals are, for example, aluminum, nickel, titanium, gold, silver, copper, vanadium, steel and mixtures or alloys thereof, for example aluminum and iron alloys. Suitable plastics include polypropylene, polyethylene, polystyrene, polycarbonate, filled or unfilled, reinforced or unreinforced, and mixtures thereof. The ring elements may consist of the same or of different materials. Each of the ring elements themselves can in turn be constructed of ring elements, which preferably consist of the same material.

Due to the annular configuration of the ring elements, an air-filled cavity is generated in the interior thereof, which serves to form vibrations. It is preferred that both ring elements have different widths and / or inner diameters. The outer diameters are preferably identical in each case. It is preferred if both ring elements have different widths with the same inner diameters. For example, a ratio of the widths of the first to the second ring element of 1.1: 1 to 4: 1, preferably 1.5: 1 to 3: 1 possible. A ratio of 2: 1 is exemplary.

The cavity filled with air also makes a contribution to the cooling of the device according to the invention. Resulting heat is also dissipated by the metallic design of the ring elements to the outside.

magnetic element

As stated above, both ring elements connect to the magnetic element.

In principle, the magnetic element can have a uniform inner diameter over its entire width. However, it is possible and preferable to subdivide the magnetic element into different subareas, for example a first, second and last (for example third) subarea, wherein the first subarea is aligned in the direction of the first annular element and the last subarea in the direction of the second annular element. The individual sections differ with respect to their inner diameter. By varying the inner diameter individual chambers can be created, in which there may be a permanent magnet whose field lines can be targeted by the design of the individual chambers.

Basically, the magnetic element has at least one annular concentric gap, which is barely wider than the outer diameter of the coil, which is at least partially inserted into the gap. However, at least the gap is so wide that the respective coil can be introduced without contact into its associated gap. The gap extends so far into the depth of the magnetic element that the coil windings can reach the vicinity of the permanent magnet when they are supplied with electrical power. However, the gap does not extend through the entire magnetic element, as this would otherwise disintegrate into two concentric cylindrical elements.

In a preferred embodiment with three partial regions, the first partial region facing the first annular element has a larger inner diameter than the third partial region facing the second annular element. The inner diameter of the second portion is greater than that of the first and third portions. The inner diameter of the third portion is only slightly larger than the outer diameter of the central element at the location of the third portion. A cylindrical cover element is arranged around the central element in the region of the first partial region. Around the central element, a cylindrical permanent magnet is arranged in the region of the second partial region. The cover element serves to shield and guide the magnetic field lines emanating from the permanent magnet. The inner diameters of the cover member and the permanent magnet are preferably equal to and slightly larger than the outer diameter of the central member in the regions of the cover member and the permanent magnet. This results in a gap in the first portion, in which the coil carrier body can dive with the coil turns and a larger cavity in the second portion, which is used in the steering of the magnetic field lines.

Depending on the exact configuration of the subregions, the magnetic flux can be regulated so that no field lines emerge from the magnetic element. It can then be dispensed with an additional shielding or at least reduced.

Preferably, the magnetic element is constructed so that substantially no stray field is emitted, since substantially all field lines are kept in the magnetic DC field. Consequently, the field lines are returned substantially lossless in the recesses. In principle, however, a shield may be provided to prevent the stray field from emerging. Preferably, the stray magnetic field is kept smaller than about 0.001 Tesla.

The magnetic element of the present invention may be made of a cylinder of magnetizable metal having a cylindrical permanent magnet centered thereon, such as by turning, drilling, milling, or other material removing methods. The cover element and the first to last partial area are then made of the same block of material.

The magnetic field causes an electromagnetic sliding padding and a high tilting stability of the central element. This also contributes to the device according to the invention being able to support itself via the central element.

The field strength in the gap of the permanent magnet is for example up to about 2 Tesla, preferably from 0.8 to 1.8 Tesla and more preferably from 0.8 to 1.6 Tesla.

For the magnetizable material, pure metals or alloys can be used. Suitable examples are iron alloys. The magnet itself may in turn be constructed of individual annular magnetic sub-elements, which preferably consist of the same material. For example, two identical magnetic sub-elements can be combined to form a magnetic element.

Resulting heat is also dissipated by the metallic configuration of the magnetic element to the outside.

Kitchen sink

The device of the present invention comprises at least one coil comprising a coil carrier body and coil turns. Also conceivable are two or more coils, which may be arranged concentrically.

The coil carrier body is annular in shape as a hollow cylinder or cup. The coil windings extend over an end region of the coil carrier body and are preferably located on the inner surface of the coil carrier body.

The bobbin body can be made of a variety of materials, such as paper, cardboard, cardboard, plastic, metal, glass, ceramic, wood and / or composites.

The coil turns are electrically conductive wires or lines that are spirally attached to a surface of the bobbin body. They may consist of copper, aluminum, silver, gold, iron, tin and their alloys with these metals or other elements as well as superconducting materials. The coil resistance is preferably 16 ohms. The applied amplifier power for operating the device is for example only 6 to 10 watts.

Preferably, the coil turns are attached to the inner surface of the coil carrier body. They can alternatively or additionally lie on the outer surface. For example, a coil carrier body has on a surface 1 to 50 windings surrounding the circumference, preferably 2 to 20, particularly preferably 3 to 15.

The coil is of flat design and the coil windings are therefore preferably wound only one layer. Multi-layer windings are also possible.

The coil carrier body may be connected to the disc-shaped carrier plate on the MHT side of the central element. This connection can be done for example by gluing, soldering or welding. However, a coil carrier body can also be made from the same workpiece as this carrier plate and consequently be connected without interruption to this carrier plate (integral production). Furthermore, a coil carrier body can also be connected to a further carrier plate, which does not coincide with the disc-shaped carrier plate on the MHT side of the central element. Such a further support plate may be located in the interior of the first ring element and be configured with respect to material and geometry similar to or the same as the disk-shaped support plate on the MHT side of the central element. The further support plate can be connected to the central element, for example glued, soldered or welded or be made with the central element in one piece (integral production).

A coil protrudes at least partially into a recess associated with it in the magnetic element, in particular the coil turns project on the coil carrier body partially into a corresponding recess in the magnetic element.

After applying an electrical voltage to a coil, it is moved parallel to the depth axis of the recess by the occurring magnetic forces in the coil turns, whereby at the same time the coil carrier body, the disk-shaped support plate of the central element and thereby ultimately the central element itself vibrated with the springs attached to it become.

Furthermore, two lines can be attached to a coil, via which the electrical power is supplied. These lines are attached to each coil in a manner known to those skilled in the art and guided to the outside of the device according to the invention. For example may be mounted on the outside of the device, two metal pins which protrude into the interior of the device and where they supply via lines the individual coils with the voltage applied to the outside of the metal pins electrical voltage.

Furthermore, the device can also have at least one coil on the BMT side for power amplification. The nature and shape of the coil may correspond to that of the coil on the MHT side.

Finally, one or more additional measuring coils for measuring the Spulenauslenkung the oscillating coil (s) described above may be included in the device, so that the exact function of the device, ie the deflection of the central element, can be checked during operation of the device.

Assembly of the individual components

The first and second ring members and the magnetic member can be connected in a variety of ways. Conceivable are screw, in each of which one element has an external thread and the adjacent element has a corresponding internal thread, bayonet, screw, adhesive or welded joints. In principle, the elements can also be manufactured from a single blank. In particular, it is possible to produce the first and second ring element and the magnetic element from a single cylindrical blank.

As stated above, the central element is coupled via the carrier plate located on its MHT side to the first spring connected to the outer edge of the first ring element. On its BMT side, the central element is guided through a concentric bore in the second spring and supported by a disk-shaped element.

Consequently, the central element is held by the first and second springs. As a result, the broadband exciter according to the invention can be held on its oscillating components, which is impossible with conventional exciters, shakers and other acoustic systems.

General features of the device

The broadband exciter according to the invention can be based on appropriate choice of materials waterproof, flame retardant, unbreakable and lightweight.

Basically, it can be made in any conceivable size. On the one hand very small dimensions are conceivable, which are limited only by the possible manufacturing techniques, on the other hand, very large dimensions are conceivable, which are limited only by the stability properties of the materials used.

The dimensioning of the first and second ring element and other elements of the device according to the invention is preferably carried out according to harmonical laws in order to obtain an optimum quality of the vibrations generated.

• Breite des ersten Ringelements: 20 mm
• Breite des Magnetelements: 30 mm
• Breite des zweiten Ringelements: 10 mm
• Außendurchmesser aller Elemente: 84 mm
• Innendurchmesser des ersten und zweiten Ringelements: 64 mm
• Einheitlicher Innendurchmesser des Magnetelements (zur Durchführung des Zentralelements): 15 mm, hierbei
  • Innendurchmesser des ersten Teilbereichs des Magnetelements: 63 mm
  • Innendurchmesser des zweiten Teilbereichs des Magnetelements: 64 mm
  • Innendurchmesser des dritten Teilbereichs des Magnetelements: 15 mm
• Durchmesser des Spulendrahts: 1,2 mm
• Durchmesser der einlagigen Spule: 62 mm
• Breite des Spaltes im Magnetelement: 1,6 mm
• Länge des Zentralelements: 95 mm
• Durchmesser des Zentralelements: 10 mm
• Abstand der Trägerplatte vom MHT-Ende des Zentralelements: 10 mm
• Durchmesser der Trägerplatte: 62 mm
• Durchmesser der Trägerscheibe (BMT-Ende): 20 mm
• Dicke der Trägerscheibe: 10 mm
• Breite der Ausnehmungen in den Federn: 2 mm
• Dicke der Federn: 2 mm
• Symmetrie der Ausnehmungen in den Federn: analog Fig. 4

Exemplary dimensions of the individual elements in a device are:

• Width of the first ring element: 20 mm
• Width of the magnetic element: 30 mm
• Width of the second ring element: 10 mm
• Outer diameter of all elements: 84 mm
• Inner diameter of the first and second ring element: 64 mm
• Uniform inner diameter of the magnetic element (for the passage of the central element): 15 mm, here
  • Inner diameter of the first portion of the magnetic element: 63 mm
  • Inner diameter of the second portion of the magnetic element: 64 mm
  • Inner diameter of the third portion of the magnetic element: 15 mm
• Diameter of the coil wire: 1.2 mm
• Diameter of single-layer coil: 62 mm
• Width of the gap in the magnetic element: 1.6 mm
• Length of the central element: 95 mm
• Diameter of the central element: 10 mm
• Distance of the carrier plate from the MHT end of the central element: 10 mm
• Diameter of the carrier plate: 62 mm
• Diameter of the carrier disc (BMT end): 20 mm
• Thickness of the carrier disc: 10 mm
• Width of the recesses in the springs: 2 mm
• Thickness of the springs: 2 mm
• Symmetry of the recesses in the springs: analog Fig. 4

The combination of the above-indicated inner diameter of the first and second ring elements and the width given above is preferred in order to obtain an optimum quality of the vibrations generated. Thus, it is preferred that, starting from the measures described above, integer multiples be used in the construction of larger embodiments of the present device, for example n = 1 to 20. It is also preferred if in the construction of smaller embodiments of the present devices stem fractures (1 / n), for example 1/100 to 1/2. Exemplary enlargement and reduction factors based on the above-described dimensions are: 2, 3, 4, 5, 6, 7, 8, 9, 10 and 1/2, 1/3, 1/4, 1/5, 1, respectively / 6, 1/7, 1/8, 1/9, 1/10. For mobile devices or small music players, for example, offers a reduction of 1/10, resulting in an outer diameter of about 4 to 5 mm. For loudspeaker systems for public address at large concerts, enlargements of 2 to 6, for example, lead to outside diameters of 84 to 252 mm.

Further advantages and fields of application of the device

With the devices according to the invention it is possible to reproduce a frequency of 0 Hz permanently. In this case, a constant voltage is applied, which leads to a constant deflection of the central element and all parts associated therewith, such as the first and second spring.

Further, it is possible to reproduce frequencies in the range of> 0 Hz to about 80 kHz or more. The device according to the invention reproduces frequencies in the typical middle and high-frequency range (from about 500 Hz) on the MHT side of the central element. Frequencies in the typical low and midrange frequencies (below about 500 Hz) are reproduced on the BMT side of the central element. In this case, the device with the protruding from the BMT side of the device end of the central element punctiform be brought into contact with a vibrating plate, whereby the vibrations generated point-shaped transmitted to this vibrating plate and this is thus added to the central element of the device synchronous oscillation.

Any conceivable material that is preferably present in a planar and / or curved design is suitable as a vibrating plate. These include car windscreens, car rear windows, Window panes, metal sheets, plastic sheets, flagstones, wood panels, roof and ceiling structures (interior and exterior), walls, ceilings, gypsum boards, stud walls and floors of structures and / or objects.

Due to the described self-supporting properties of the device according to the invention, the coupling to any object is made possible.

In this respect, the devices according to the invention are suitable for the construction of public address systems of shallow depth, since the large, heavy and space-consuming woofers otherwise used in the prior art can be avoided and replaced by only one larger vibrating plate of sufficient size and one or more devices according to the invention mounted thereon. Due to the watertight embodiment of the device according to the invention, an object sonication is made possible indoors and outdoors, where water or water vapor is present.

It is also possible to achieve very high sound pressure levels, for example more than 90 to 100 dBA, by synchronizing a plurality of devices according to the invention on a vibrating plate.

The device according to the invention can be fixed at a specific location both via the BMT side and the MHT side. For example, it is conceivable to attach the devices with the BMT side to a ceiling and to use ceiling cladding elements to reproduce the lower frequencies.

Through these exemplary applications, it will be apparent that the apparatus of the present invention can be mounted on objects at its vibrating center member. Due to the compact design, therefore, the self-supporting, essentially point-like coupling is made possible to each object. This is not possible with conventional loudspeakers because the vibrating diaphragm is too sensitive to support the overall weight of a loudspeaker.

As described above, a group of devices according to the invention can be operated synchronously, with the BMT sides of all members of the group being mounted on a vibrating plate. However, if the individual group members can be individually controlled, this can be done by the Composers predetermined sound image can be generated in space, as if the orchestra itself played in the room.

In contrast to conventional loudspeakers, sound waves are excited in the devices according to the invention by a lifting and rotary movement of the sound-generating elements. The torsional vibrations avoid interference from reflections on fixed objects or walls, for example. The generated sound waves are broken at the obstacles; a reflection hardly takes place; Interference is reduced or avoided.

In summary, the devices according to the invention can offer the following advantages: they can be self-supporting, they can have a low energy consumption, they can have a low heat generation, they can have a low scattered radiation of less than 10 ^-3 T, they can cause the formation of interference waves Avoid overlapping frequency ranges when using different exciters, shakers, bending wave loudspeakers or loudspeakers from the prior art and they can produce the sound of nature modeled sound waves via a hub-and-turn movement of the central element.

The devices according to the invention can be installed in pieces of furniture and applied to walls, pictures, beds, car windows, glass panes, gypsum boards, stud walls, membranes and living organisms.

They can be used for the reproduction of acoustic signals such as speech and music, for generating noise, in the wellness area and in medicine. For example, they can be used for stress therapy, as a single and full sleep aid, in decubitus prophylaxis or treatment, pain treatment, treatment of circulatory disorders and for muscle growth, in which the respective patient adapted frequencies are radiated on this.

Furthermore, the devices according to the invention can be used in technical processes. For example, in drilling the soil can be loosened by the simultaneous application of sound waves generated by the devices according to the invention and thereby the force to be expended can be reduced. With a suitable frequency, the soil can also be compressed again.

In the automotive sector, a complete sonication of the interior of an automobile can be achieved by only two broadband exciters according to the invention. For this purpose, the exciter could be mounted, for example, on the windshield. Simplified production, lower weight of the automobile and thus reduced fuel consumption are the result.

With a correspondingly small dimensioning, the broadband exciter according to the invention can be used in mobile radio devices and mobile sound reproduction systems such as MP3 players.

Furthermore, it can be used to create underwater sounds or music, for example in whirlpools, bathtubs, swimming pools or birth pans.

Likewise, an application in single, Durchschlaf- and massage blankets is possible.

LIST OF REFERENCE NUMBERS

1:

first ring element

2:

magnetic element

3:

second ring element

4:

central element

5:

cavity

10:

coil windings

11:

Coil support body

12:

permanent magnet

13:

cover member

20:

External thread (MHT side)

21:

Disc-shaped carrier plate (MHT side)

22:

Disc-shaped element (BMT side)

23:

adhesive

24:

External thread (BMT side)

30:

magnetic gap

40:

first spring (MHT side)

41:

second spring (BMT side)

50:

leads

51:

insulation

60:

recess

61:

slot

62:

first slot portion

63:

second slot portion

64:

third slot subarea

65:

tongue-shaped spring leaf

100:

contraption

figure description

Show it Fig. 1 the cross section of a device 100 according to the invention, Fig. 2 a section of the device 100, Fig. 3 a variant of the section Fig. 2 . Fig. 4 an exemplary embodiment of a spring 41 and Fig. 5 an exemplary embodiment of a spring 40th

In Fig. 1 a device 100 according to the invention is shown, in which a first ring element 1 is connected to a magnetic element 2 and this in turn to a second ring element 3. A central element 4 is located in the center of the cavity 5 generated by the ring elements 1, 3 and magnetic element 2. The central element 4 is connected to the adhesive 23 by a cup-shaped coil carrier body 11, at the end of which are three coil turns 10. The coil windings protrude into the magnetic gap 30, which is formed by a cylindrical cover element 13 and a first portion of the magnetic element 2. A cylindrical permanent magnet 12 is located in the second portion of the magnetic element 2 and has the same dimensions as the cover member 13 in the first portion. In the first ring element 1 there are two connection wires 50, which protrude through the ring element 1 and are each shielded with an insulating sheath 51. The central element 4 has an MHT side with coupling device 20 (external thread), which carries a disc-shaped support plate 21. On the support plate 21, a first spring 40 is fixed centered by means of adhesive 23, which in turn is attached to the first ring element 1 with adhesive 23. At its BMT side, the central element 4 has a second spring 41, on which a disk-shaped element 22 is fastened. The spring 41 is connected via adhesive 23 to the outside of the second ring element 3. The BMT side of the central element 4 has an external thread 24.

In Fig. 2 a section of a device 100 is shown, in which the coil carrier body 11, which has three coil turns 10, with adhesive 23 to the disc-shaped support plate 21 at the MHT side of the central element 4 is mounted. Both sides of the central element have male threads 20 (MHT side) and 24 (BMT side).

In Fig. 3 a section of a device 100 is shown, in which the coil carrier body 11, which has three coil windings 10, the disk-shaped support plate 21 on the MHT side of the central element 4 and the central element 4 are made of a workpiece. Both sides of the central element have male threads 20 (MHT side) and 24 (BMT side).

In Fig. 4 a spring 41 is shown having a recess 60 in the middle through which a central element 4 (not shown) can be passed. The spring 41 has four slots 61, each consisting of three sections 62, 63, 64. Two slots 61 each form a tongue-shaped spring leaf 65.

In Fig. 5 a spring 40 is shown having in the middle a disc-shaped support plate 21 which belongs to a (not fully shown) central element 4. The outer thread 20 can also be seen. The spring 40 has four slots 61, each of which consists of three sections 62, 63, 64. Two slots 61 each form a tongue-shaped spring leaf 65.

In the figures, for reasons of clarity, partial distances are drawn between the individual elements. However, it is understood that these distances do not exist when assembling the devices according to the invention.

Claims (13)

1. Broadband exciter (100) comprising
   a magnetic element (2) having a concentric opening,
   at least one oscillation coil that is movable at least partially inside the concentric opening and along the same,
   a rod-shaped central element (4) which extends through the concentric opening and is connected to the at least one oscillation coil and can be prompted to oscillate by said coil, such that the rod-shaped central element (4) at a first end thereof produces sound waves in a first continuous frequency range when coupled to a loudspeaker membrane, and at a second end thereof produces sound waves in a second continuous frequency range when coupled to an oscillation plate, which second continuous frequency partially overlaps the first continuous frequency range;
   a first annular element (1) arranged adjacent to the magnetic element (2) at the side of the first end of the rod-shaped central element (4) and connected via a first elastic element (40), particularly a spring, to the rod-shaped central element (4); and
   a second annular element (3) arranged adjacent to the magnetic element (2) at the side of the second end of the rod-shaped central element (4) and connected via a second elastic element (41), particularly a spring, to the rod-shaped central element (4);
   in which at least one of the elastic elements (40, 41) is configured to excite rotary oscillations, particularly spiral-like rotary oscillations, of the rod-shaped central element (4).
2. Broadband exciter (100) according to claim 1, further comprising a disc-shaped element (22) which is connected at the side of the second end of the rod-shaped central element (4) to the second elastic element (41) and the rod-shaped central element (4), and wherein the rod-shaped central element (4) extends through a concentric opening of the disc-shaped element (22).
3. Broadband exciter (100) according to any one of the preceding claims, in which the rod-shaped central element (4) comprises a disc-shaped plate (21) near its first end; and the at least one oscillation coil comprises a coil carrier body (11) which is connected to the disc-shaped plate (21) of the rod-shaped central element (4), and at least one coil winding (10).
4. Broadband exciter (100) according to claim 3, further comprising a permanent magnet (12) with a concentric opening and a cover element (13) with a concentric opening which are arranged in the opening of the magnetic element (2), wherein the rod-shaped central element (4) extends through the concentric openings of the permanent magnet (12) and of the cover element (13), and the oscillation coil body (11) of the at least one oscillation coil surrounds the cover element (13) and/or the permanent magnet (12).
5. Broadband exciter (100) according to claim 1, in which
   the rod-shaped central element (4) comprises a disc-shaped plate (21) near an end, and further comprising

   - a first annular element (1) which forms a first cavity,

   - a magnetic element (2) which forms a second cavity,

   - a second annular element (3) which forms a third cavity,

   - a first and a second spring (40, 41) in contact with the first or second annular element (1, 3),

   - a disc-shaped element (22) in direct or indirect contact with the second spring (41), and

   - at least one coil comprising a coil carrier body (11) and at least one coil winding (10).
6. Broadband exciter (100) according to claim 5, characterized in that the first spring (40), the first annular element (1), the magnetic element (2), the second annular element (3), the second spring (41) and the disc-shaped element (22) are positioned in this sequence.
7. Broadband exciter (100) according to claim 5 or 6, characterized in that the coil carrier body (11) at one end is in direct contact with the coil windings (10) and at the other end in contact with the central element (4) and the at least one coil is located at least partially with its coil windings (10) in the interior of the at least one second cavity located in the magnetic element (2).
8. Broadband exciter (100) according to any one of claims 5 to 7, characterized in that a substantial part of the central element (4) extends through the first to third cavity, which together form a joint cavity, and parts of the central element (4) project at both sides out of the first and third cavity.
9. Broadband exciter (100) according to any one of claims 5 to 8, characterized in that the central element (4) has a mid- and high-range side (MHT side) and a bass- and mid-range side (BMT side), wherein at its MHT side an internal and/or external thread is provided and at its BMT side an internal and/or external thread.
10. Broadband exciter (100) according to any one of claims 5 to 9, characterized in that the springs (40, 41) are configured as discs.
11. Broadband exciter (100) according to any one of claims 5 to 10, characterized in that the magnetic element (2) comprises at least one annular concentric gap (30).
12. Use of the broadband exciter (100) according to any one of the preceding claims for reproducing acoustic signals such as speech and music, defined frequencies and frequency bands for sound generation, in the wellness sector, in medicine, for stress therapy, for vibro-acoustics, as fall-asleep and sleep-through aid, in decubitus prophylaxis or treatment, pain treatment, treatment of circulatory disorders, for muscle building, for soil loosening, for soil compaction, for the sonication of the interior of an automobile, in mobile phones and mobile sound reproduction systems, such as MP3 players, for generating underwater sounds or music as in whirlpools, bathtubs, swimming pools or birthing pools, and in fall-asleep, sleep-through and massage blankets.
13. Device comprising at least one broadband exciter (100) according to any one of the preceding claims, and at least one oscillation plate.

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