DE102016226006A1 - Device for exciting vibrations and use of such a device - Google Patents

Abstract

The invention relates to a device for excitation of oscillations in a star-shaped surface extensively extended Übertragerstruktur. In particular, the device can be used in a loudspeaker for the reproduction of audio signals. The device has at least two excitation means, each having at least one permanent magnet with an annular gap, at least one annular plunger coil and at least one vibrating part carrier. The oscillatory subcarrier is releasably coupled to the transducer structure, and the transducer structure is disposed between two excitation means.

Description

Field of application and state of the art

The invention relates to a device for excitation of oscillations with a preferably star-shaped planar extensively distributed transformer structure. In particular, the device can be used in a loudspeaker for the reproduction of audio signals. Furthermore, the invention relates to possible uses of such a device.

From the DE 102006031433 B4 For example, a surface diaphragm type exciter is known in which an acoustic vibration excitation element is connected to a coupling ring by means of a releasable connection, the coupling ring being connected to a sound emitting surface. The exciter can be used, for example, together with the sound-emitting surface as speakers in vehicles or aircraft for playback of audio signals.

From the WO 2009/086925 A1 are known a vibrator for a flat speaker and a flat speaker, which has such a vibrator and an excited to vibrate panel. It also shows a vehicle in which at least one such flat speaker is installed, the panel forming a portion of the vehicle itself.

A disadvantage of the solutions mentioned is the relatively small power density of the speakers, which is transferable to the sound-emitting surface.

Most are excitation elements or at least part of it, z. B. the coupling ring, glued for fixing to the sound-emitting surfaces. This leads to a complex assembly with increased error probability in the alignment and fixation.

Another disadvantage is that such surface diaphragm speakers usually have a large size and a large weight. This leads to many applications such. As in aviation or in vehicle construction to increased fuel consumption and can adversely affect.

Task and solution

The invention has for its object to provide an aforementioned device and a corresponding use with which problems of the prior art can be solved and in particular a powerful device for exciting vibrations with a transformer structure can be created.

This object is achieved by a device according to claim 1 and uses according to claim 15, 16 or 17. Advantageous and preferred embodiments of the invention are subject matter of further claims and are explained in more detail below. Some of the features mentioned below are mentioned for one device only or for one use only. However, they should be able to apply independently and independently of each other, both for a device and for use. The wording of the claims is incorporated herein by express reference.

In the invention, the device has a star-shaped, extensively extended transformer structure. For the most distortion-free reproduction of audio signals, this form of transformer structure has proven to be particularly advantageous. The transformer structure is fixed between two excitation means by means of a coupling mechanism. The coupling mechanism is designed in particular for mounting purposes detachable.

The excitation means have at least one permanent magnet with an annular gap, at least one annular plunger coil and at least one vibrating part carrier. The immersion coil can be traversed by electric current and generates a dependent of the excitation signal electromagnetic alternating field, thereby moving the plunger coil in the annular gap of the permanent magnet. This function of a plunger coil is well known to the skilled person and is therefore not explained in detail. The vibrating part carrier is mechanically or constructively connected to the plunger and passes the vibrations on.

The device with two excitation means, which excite the transformer structure to be excited from two opposite sides, achieves a high power density of the oscillations in the transformer structure. In order for the power of the two opposing excitation means to add up, the excitation means oscillate 180 ° out of phase with each other.

In an advantageous embodiment of the invention, the device is designed such that vibrations with frequencies in the audible range of human hearing can be excited. Preferably, the frequencies are between 15 Hz and 20 kHz.

The operation of the excitation means requires electronic circuits such as drivers, amplifiers, etc. The electronic circuits are integrated in at least one of the excitation means in a preferred embodiment of the invention. As a result, the required installation space of the device is low held and the device can be realized relatively flat.

To operate the excitation means requires electrical energy to z. B. to supply the exchange coils with electric current. A further advantageous embodiment of the invention therefore envisages integrating energy storage in the form of at least one battery and / or at least one accumulator into at least one of the excitation means. An energy store can also run through both excitation means, so that it has sufficient storage space and can be sufficiently large.

In order to avoid destruction and / or malfunction of the device, the heat generated during operation of the device must be removed from the device. This is done in a further advantageous embodiment of the invention over existing from carbon fiber reinforced plastic, spring-like elements that forward the resulting heat to the excited transformer structure. There, the heat can be distributed over a large area and released to the environment. Ideally, then can be dispensed with the ferrofluid used in the prior art. By dispensing with ferrofluid, the device can be produced significantly cheaper and soiling is prevented.

In a further advantageous embodiment of the invention, the transformer structure is made of carbon fiber reinforced plastic. This has proven to be particularly advantageous because carbon fiber reinforced plastic has a high rigidity, resulting in particularly good vibration transmission properties.

In a further advantageous embodiment of the invention, the device has a plurality of separate arrangements consisting of a respective permanent magnet, each having an annular gap, and in each case a plunger coil for different frequency ranges of the vibrations to be excited. Thus, the sound power for different frequencies can be divided into the respective separate arrangements. Thus, the different properties of the arrangements for different frequencies can be optimized.

In a further advantageous embodiment of the invention, the device has at least one permanent magnet, which has at least one annular gap, and at least one annular plunger coil, which can be used for the inductive generation of electrical energy from the vibration of the transformer structure. This can be obtained from an external excitation of the transformer structure electrical energy. Furthermore, the device may have at least one coil for the inductive coupling of electrical energy. This coil may be one of the immersion coils, but may also be a separate coil.

In a further embodiment of the invention, the recovered electrical energy is advantageously stored in an energy store in the form of a rechargeable battery, which is already integrated in the device.

In a further advantageous embodiment of the invention, the extensively extended Übertragerstruktur a plurality of arms which are arranged distributed radially around a central region, which can give a star shape. It has proven to be particularly advantageous to use 6 arms. The lengths of the arms are typically in the range of 3 cm to 50 cm, advantageously 6 each having a different length.

The width of the arms is preferably in the range 5 mm to 50 mm, the height of the arms advantageously in the range 1 mm to 5 mm. The central area and the arms extending therefrom advantageously span an area of 20 cm ² to 8000 cm ² .

The transformer structure may have a height of 1 mm to 5 mm over a support surface, wherein the total height of the device may be between 2 mm and 10 mm.

The central region of the transformer structure may have an increase relative to the arms distributed radially around the central region. The excitation means are advantageously arranged in the central area, the transmitter structure being arranged between two excitation means, one above and one below.

The device can be advantageously used as a loudspeaker for reproducing audio signals such as music or voice announcements.

Due to the compact design and the ease of assembly, the device is suitable for use in motor vehicles, aircraft and / or spacecraft.

In a further embodiment of the invention, a part of the coupling mechanism between the oscillating member carrier and the transformer structure and the transformer structure are arranged in a superordinate component. This can be z. B. happen that a part of the coupling mechanism and the transformer structure in a plastic part such. For example, an interior trim panel of an airplane or car may be incorporated during manufacture or may be part of it. The excitation means can then be subsequently applied, thereby saving manufacturing time, the Adjustment simplified and easy replacement is guaranteed.

These and other features will become apparent from the claims but also from the description and drawings, wherein the individual features each alone or more in the form of sub-combinations in an embodiment of the invention and in other fields be realized and advantageous and protectable Represent embodiments for which protection is claimed here. The subdivision of the application into individual sections and subheadings does not limit the statements made thereunder in their generality.

list of figures

• 1 eine Schrägansicht einer erfindungsgemäßen Ausführungsform der Vorrichtung,
• 2 eine Schrägansicht einer weiteren erfindungsgemäßen Ausführungsform der Vorrichtung und
• 3 eine Seitenansicht einer weiteren erfindungsgemäßen Ausführungsform der Vorrichtung.

Embodiments of the invention are illustrated in the drawings and are explained in more detail below. In the drawings show:

• 1 an oblique view of an embodiment of the device according to the invention,
• 2 an oblique view of another embodiment of the device according to the invention and
• 3 a side view of another embodiment of the device according to the invention.

Detailed description of the embodiments

1 shows an oblique view of an embodiment of the device according to the invention. The device consists of a stimulable extensively extended transformer structure 11 that is between a first stimulating agent 20 and a second excitation means 30 is arranged. The transformer structure 11 has 6 elongated arms 12 are arranged distributed radially around a central region, so that a star shape is formed. Advantageously, the arms have 12 each different lengths. Typical lengths are in the range of 3 cm to 50 cm. The width of the arms 12 typically ranges from 5 mm to 50 mm, the height or thickness of the arms 12 typically in the range 1 mm to 5 mm. The central area and the outgoing arms 12 span an area of typically 20 cm ² to 8000 cm ² . The transformer structure 11 consists of CFRP, ie a carbon fiber reinforced plastic. That makes the transformer structure 11 Particularly stable, and the high stiffness of kohlestofffasernverstärktem plastic allows good vibration transmission properties. The shape and the choice of material of the transformer structure have proven to be the most distortion-free reproduction of audio signals as particularly advantageous.

The first stimulant 20 and the second excitation means 30 have a round shape. The outer circumference of the first and second excitation means 20 and 30 each is not greater than the circumference of the central region of the transformer structure 11 ,

In the device is an energy storage 40 in the form of an accumulator within the outer periphery of the excitation means 20 . 30 integrated. The energy storage 40 is shown in the illustration for clarity only schematically and is to be regarded as installed in the device. Also shown schematically and as in one or both of the excitation means 20 or 30 considered to be installed, the device has a signal processing or control electronics 50 on. With the signal processing or control electronics 50 an incoming signal is processed, e.g. As an audio signal, and the required electronic power for operating the plunger provided. By integrating the energy storage 40 and the signal processing or control electronics 50 Within the outer periphery of the excitation means, the required installation space of the device is kept small and the device can be realized relatively flat. Above all, this reduces the space requirement.

The first stimulant 20 and the second excitation means 30 each have a permanent magnet, each having an annular gap. In addition, the exciters have 20 and 30 in each case an annular plunger coil and at least one respective oscillating part carrier. When current flows through the plunger coils, they generate, in a known manner, an electromagnetic alternating field which causes them to oscillate in the magnetic field of the permanent magnets. The vibration is transmitted to the vibrating part carrier, which is mechanically connected to the plunger coil. The vibrating part carrier is in turn with the transformer structure 11 mechanically connected and transmits the vibrations to the transformer structure 11. The first excitation means 20 and the second excitation means 30 have a first part 21 of a coupling mechanism and a second part 31 a coupling mechanism having a releasable connection between the excitation means 20 . 30 and the transformer structure 11 allow that lies in between.

In order for the power of the two opposing excitation means to add up, the excitation means oscillate 180 ° out of phase with each other. The signal processing or control electronics 50 ensures this phase shift.

2 shows a further plan view of an embodiment of the device according to the invention. The extensively extended transformer structure 11 can be pre-assembled in a higher-level component. Furthermore, the transformer structure 11 also a part be the parent component, so integral part. A parent component is z. B. a plastic panel of a vehicle interior or an aircraft cabin. The first stimulant 20 and the second excitation means 30 can then be retrofitted over the first part 21 a coupling mechanism and a second part 31 a coupling mechanism 1 be connected to the plastic panel.

3 shows a side view of an embodiment of the device according to the invention. The transformer structure 11 has a height of 1 mm to 5 mm over a support surface, wherein the total height H of the device is between 2 mm and 10 mm, preferably between 3 mm and 6 mm. The central region Z of the transformer structure can be raised relative to the arms distributed radially around it 12 exhibit. The first stimulant 20 and the second excitation means 30 are advantageously arranged in the central region Z, wherein the transformer structure 11 between the two excitation means 20 and 30 is arranged.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102006031433 B4 [0002]
• WO 2009/086925 A1 [0003]

Claims (17)

Device for excitation of oscillations in an excitable, preferably star-shaped, extensively extended transformer structure with a transformer structure and at least two excitation means, each comprising - at least one permanent magnet having an annular gap, - at least one annular plunger coil and - at least one vibrating part carrier, wherein the vibrating part carrier is coupled to the transformer structure and to this together with the transformer structure has a releasable coupling mechanism, characterized in that the transformer structure is arranged between the two excitation means. Device after Claim 1 , characterized in that two excitation means are provided for excitation of the transformer structure, which oscillate phase-shifted by 180 ° to each other. Device after Claim 1 or 2 , characterized in that the frequencies of the excited oscillations of the transformer structure in the audible range of human hearing, preferably between 15 Hz and 20 kHz. Device according to one of the preceding claims, characterized in that provided for exciting the vibrations in the transformer structure electronic circuit is integrated in one of the excitation means. Device according to one of the preceding claims, characterized in that at least one electrical energy storage device for supplying the required for excitation of the vibrations in the transformer structure electrical energy is integrated in the device, preferably within at least one of the excitation means. Device according to one of the preceding claims, characterized by a derivation of the heat generated in the device via the transformer structure, preferably on existing of carbon fiber reinforced plastic spring-like elements. Device according to one of the preceding claims, characterized in that the transducer structure to be excited comprises carbon fiber reinforced plastic or consists of carbon fiber reinforced plastic. Device according to one of the preceding claims, characterized in that an excitation means comprises a plurality of separate permanent magnets, each having an annular gap and having a plurality of plunger coils for different frequency ranges of the vibrations to be excited. Device according to one of the preceding claims, characterized in that at least one permanent magnet, which has at least one annular gap, at least one annular plunger coil for inductive generation of electrical energy from the vibration of the transformer structure, preferably for charging the energy storage device according to Claim 5 , Device according to one of the preceding claims, characterized in that the device comprises at least one coil for inductive coupling of electrical energy, preferably for charging the energy storage device according to Claim 5 , Device according to one of the preceding claims, characterized in that the star-shaped, extensively extended Übertragerstruktur comprises a plurality of arms, preferably 6, wherein the arms each in particular between 3 cm and 50 cm long and preferably between 5 mm and 50 mm wide and preferably between 1 mm and 5 mm high and are distributed radially around a central central area. Device according to one of the preceding claims, characterized in that the Übertragerstruktur has an extension of the area between 20 cm ² and 8000 cm ² . Device according to one of the preceding claims, characterized in that the Übertragerstruktur has a height between 1 mm and 5 mm above a support surface, wherein preferably a total height of the device is between 2 mm and 10 mm, in particular between 3 mm and 6 mm. Device according to one of the preceding claims, characterized in that a central region of the transformer structure has an increase relative to radially distributed around the central region arms, wherein preferably the excitation means are arranged in the central region. Use of a device according to one of the preceding claims as a loudspeaker for reproducing audio signals. Use of a device according to one of Claims 1 to 14 in an aircraft or spacecraft. Use of a device according to one of Claims 1 to 14 in a motor vehicle.

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