DE102009036337B4 - Device with embedded membrane - Google Patents

Abstract

Device for a flat-panel loudspeaker with a membrane that can at least partially reproduce frequencies in the human audible range, the membrane being embedded in a material in such a way that the membrane is completely enveloped by the material, characterized in that the material is a building material for structural use is.

Description

The present invention relates to a device with a membrane which can at least partially reproduce frequencies in the human hearing range.

From the utility model DE 20 2005 004 730 U1 is an invisible in plate materials integrated flat speaker known. A plate is provided on one side with a recess, are inserted in the voice coil. The voice coils cause the bottom of the recess, which is thinner than the plate, to vibrate.

In addition, in the document DE 10 2004 061 314 A1 a speaker diaphragm and a method for producing a speaker diaphragm are described. The speaker diaphragm comprises a tapered edge region. This makes it possible in a cost effective and effective way to prevent wave reflection and thereby caused uncontrolled wave propagation or significantly reduced.

Further, the patent discloses AT 236 474 B an electroacoustic transducer with a permanent magnet, which is fixed by a body produced by die casting or injection molding. The magnet system is enclosed from the outside by the cast material. The one-piece body thus formed carries disc-shaped or annular projections, which serve for fastening a membrane.

In the patent DE 900 228 B a diaphragm of high rigidity for sound reproduction is described. A foam structure serving as a membrane is covered on one or two sides with a thin skin. This increases the rigidity of the membrane. Furthermore, the patent shows DE 103 03 244 B3 a loudspeaker in which the membrane is layered from at least one core layer and an additional layer. This can reduce vibration problems and resonance problems.

Task:

Some materials such as concrete or gypsum have structurally good properties, but are unsuitable as membranes for acoustic devices such as area speakers, because they are very heavy. As a result, the achievable frequency response is worse and / or the achievable volume lower compared with lighter membrane materials.

Solution according to the invention:

The device disclosed herein according to claim 1 is based on the embedding of membranes of acoustic devices such as surface speakers in materials or materials whose acoustic properties, for example, in terms of frequency response or volume are worse than the acoustic properties of the membrane itself. The goal of this embedding is to acquire the acoustically inferior materials or materials improved acoustic properties and / or to allow their use as acoustically effective elements or improve. One possible improvement is, for example, an extended frequency response or better volume efficiency.

Furthermore, a method is described, which shows the generation of acoustic signals by means of the above-mentioned embedded membranes.

This disclosure now achieves the benefit of at least partially improving the above-mentioned acoustic properties by combining and combining lighter membranes with, for example, heavy materials such as concrete or gypsum.

Furthermore, it is also possible to develop lightweight, self-contained, acoustically bad-sounding or useless membrane materials, such as fiber mats and / or air bubble film, by embedding them into better-sounding acoustic properties.

In the method disclosed here, for example, light membranes are sunk into a heavier material. This is done in a manufacturing process in which, for example, poured concrete or plaster into a mold and / or poured, the membrane is also given in this form. As a result, the membrane is at least partially surrounded or enveloped by the heavier material. Preferably, the embedding creates a firm connection between membrane and sheath.

Furthermore, for example, the heavy material may be mixed with a liquid or a solvent, such as water. This creates, for example, a mush that is viscous. If a membrane is inserted in this slurry, it can sink into it and / or be sunk into it.

After setting and / or drying, a solid material is now formed which at least partially contains at least one membrane. These Membrane has now become part of the overall structure.

By incorporating the membrane or a plurality of membranes, the acoustic properties of the original fabric are at least partially improved so that the overall structure can be used as an acoustic device, such as area loudspeakers with improved acoustic properties.

The process of embedding membranes produces, as it were, "in one piece" an acoustically usable component. The method avoids any type of millings, holes, cuts and the like in the surrounding material, as for example the disclosures in the prior art do. By avoiding this, the surrounding material is not damaged, which has a positive effect on the stability and / or integrity of the new construction part.

The new overall structure can in turn be used, for example, as a membrane for a flat loudspeaker, wherein according to the invention it has better acoustic properties than the surrounding material alone would have had.

• – eine größere Energie-Effizienz,
• – einen größeren Wirkungsgrad,
• – ein gleichmäßigeres Wiedergabespektrum,
• – ein größeres Wiedergabespektrum,
• – eine schnellere Impulswiedergabe

oder eine beliebige Kombination aus den genannten und weiteren akustischen Kriterien.Better acoustic properties are understood, for example

• - greater energy efficiency,
• - greater efficiency,
• A more even reproduction spectrum,
• - a wider range of playback,
• - a faster pulse reproduction

or any combination of the above and other acoustic criteria.

In addition to the mentioned acoustic properties of the embedded membrane further physical properties can be used.

For example, the membrane may be at least partially magnetic and / or magnetizable, so that then the overall structure of membrane and sheath has a magnetic and / or magnetizable property.

For example, the membrane may be electrostatically charged and / or permanently electrostatically charged so that paper sheets, prints, or other sheet-like objects will adhere to the overall structure. Even accumulations of leaves such as newspapers and / or magazines can stick with a correspondingly strong electrostatic field.

For example, the embedded membrane may be designed to be luminous and / or light-emitting, so that when it is embedded in at least partially translucent material, it is possible to emit light.

By attaching a vibration exciter to the overall structure of this can be acoustically effective and behave like a flat speaker.

Description of a flat-panel loudspeaker:

Area loudspeakers are understood in this disclosure to mean so-called transversal wave loudspeakers. In contrast, so-called longitudinal wave loudspeakers are used in most conventionally used sound generators.

A longitudinal wave loudspeaker works like a piston-stroke loudspeaker. A mostly cone-shaped diaphragm is excited by an electrically amplified audio signal to reciprocate on an axis and thus at least partially generate an acoustic image of the audio signal. The sound waves generated by this loudspeaker are aligned in the longitudinal direction to it.

A transversal wave speaker works like a vibrating surface. By a corresponding vibration drive, which is usually electrodynamic and / or piezoelectric, a surface is excited to vibrate. This vibrating surface now produces a sound wave image that is completely different from the above-mentioned longitudinal waves. This wave pattern is called the transverse wave image, as it develops along the sound surface. This principle is known for example in musical instrument making centuries. In loudspeaker construction, this principle has existed at least since the Blatthaller, an invention of Walter Schottky at Siemens in Berlin in the 1920s.

Other patents cited in the prior art indicate that the transverse wave principle is well known. Speakers working on this principle have a mostly plate-shaped membrane. This can be flat or curved.

By an appropriate drive the membrane surface is excited to vibrations. These vibrations stimulate the air surrounding the membrane to vibrate. If the vibration frequencies are in the audible range, they are perceived as an acoustic event. The sound-generating principle is thus based on areal trained membrane that vibrates and thus the surrounding Medium, for example, water or air to vibrate.

In this disclosure, a method is now called, which makes it possible by itself from poorly suitable materials such as concrete by embedding themselves from well-suited membranes such as honeycomb panels to help in total sufficiently good sounding properties.

Likewise, too lightweight or too unstable materials such as foams and / or braids and / or fibers and / or fiber mats and / or any other materials that are inherently too unstable for membranes may be developed by embedding for better acoustic properties.

Furthermore, mixtures and / or combinations and / or patterns of different and / or similar materials can be embedding, for example, different materials can be embedded at different locations of the envelope. For example, softer materials can be embedded at a location where a woofer voice coil is used and harder materials are embedded at a location where a tweeter voice coil is used. For example, regular and / or irregular patterns of the same and / or different materials can be embedding. Any other combinations are conceivable.

Furthermore, the membranes to be embedded may have undergone a pretreatment, for example by roughening and / or grinding and / or primers and / or primer, in order to achieve improved connectivity with the encapsulating material during the process of embedding.

Differentiation from the state of the art (HD4R):

• DE 20 2005 004 730 U1
• K.-H. Theis, 2005
• Invisible in panel materials integrated flat speaker

In this utility model protection, the introduction of a membrane is described in another material. In this case, a cutout is preferably made by means of a milling cutter. In this cutout a correspondingly large membrane is then glued or otherwise connected non-positively.

One side of the material can remain undamaged in this process. Thus, this page is not to see whether a membrane has been installed or not. The method thus works invisibly for at least one page.

The essential difference from this disclosure is the fact that in the above method, the original material is abraded. The surface of the material is destroyed by milling on at least one side, which has a negative effect on the consistency. Since the original surface tension and / or surface consistency is destroyed on one side, mechanical bending and / or cracks can not be ruled out. The sticking of a membrane in the milled out position brings about a further material tension and / or a further temperature expansion coefficient, which shows negative effects in the event of temperature changes. Furthermore, an amount of original material is removed and disturbed and must be disposed of in this process. Depending on the substance type, this can lead to environmental pollution. The method according to Theis is economically nonsensical and leads to very expensive products.

This disclosure, however, is sparing with the wrapping material - there is nothing to be thrown away, the environmental impact is significantly lower when embedding in terms of disposal. This method thus allows cheaper production costs.
EP 0 847 676 B1
Inertial Vibration Transducers
Azima H., Colloms, M., 1996, New Transducers Limited

In this disclosure, a voice coil is integrated into a membrane so that it can excite the membrane to vibrate, but the voice coil is completely within the membrane. It is therefore an embedded voice coil.

Difference to known membrane materials:

Of the previously known sandwich materials, this disclosure differs in the following points:
First, in this disclosure, the membrane material is completely surrounded by the sheath. For sandwich materials, only the cover layers are applied to the core material from above and below.
Second, this disclosure does not use an adhesive between the membrane material and the cladding. For sandwich materials, an adhesive is always used to bond the cover layers.

Of the previously known framing of membranes, this disclosure differs in the following points:
First, the membrane material is not just surrounded at the edges.
Second, the frames use an adhesive or an acoustically effective bond to secure the membrane. Both are not made in this disclosure.

Realization possibilities of the device for embedding membranes:

Example 1, Fig. 1a

The assembly line-type device

This picture 1a shows a production line 1 here moving from left to right and having a length L and a width B. From a funnel and / or material dispenser and / or a dosing device 2 At least a first layer of material intended for the covering is placed on the assembly line. This material is transported further by the movement of the conveyor belt. At the point 3 the membrane and / or the membranous material is added. Depending on the material consistency, this can be done mechanically and / or by hand and / or from a rolling device and / or a litter device and / or a material transmitter adapted to the material. By introducing the membrane and / or the membrane-like material are now at least two substances on the assembly line. The movement of the assembly line now transports the previous material to another station 4 , Here is now again from a hopper and / or material dispenser and / or a dosing 2 at least one further layer of the material intended for the wrapping is placed on the assembly line. This can be the material of the funnel 2 and 4 be the same or different. To achieve a uniform thickness can have a scraper and / or height limiter 5 the desired total thickness can be produced.

By a cutting process, not shown, the resulting overall structure of membrane and wrapper can now be separated from each other and / or cut. After curing and / or setting and / or finishing and / or additional finishing, the entire structure, the embedded membrane, is ready.

Example 1, Fig. 1b

The illustration 1b shows a possible result of the above production process. Shown is a sectional view of a resulting overall structure, consisting of embedded membrane and / or membrane-like material and the envelope.

Example 1, Fig. 1c

The illustration 1c shows different types of membranes and membrane-like materials in plate-like form each in the sectional view. The left two examples show membranes that have round and / or circular and / or oval structures. The upper membrane is covered, the lower one not. The right two examples show membranes that have rectangular and / or polygonal and / or scaffold-like and / or non-circular structures. Again, the upper membrane is provided with cover layers, the lower not.

Example 1, Fig. 1d

The illustration 1d shows different membrane-like materials. The upper example shows a pliable material, such as bubble film. The middle material shows a web consisting of threads and / or looped fibers and / or woven patterns. The lower material shows a battle, as represented by fiber mats.

Example 2, Fig. 2

The assembly-line device with press

The illustration 2 shows a similar picture as the , but here is the desired height of the overall structure by a pressing process 5 reached. The overall structure can certainly be influenced by a factor of two or more in its thickness.

Example 3, Fig. 3

The in-type device

The illustration 3 shows a tub and / or a container 1 into which the wrapping material 2 is entered. After a desired level is reached, the membrane to be embedded and / or the membrane-like material 3 added. Then the filling of the tub 4 continued until reaching the desired level. If necessary, the density of the coating can be increased by pressing. The pressing process is not shown in the figure. After curing and / or setting and / or completion and / or removal and / or additional post-processing, the overall structure, the embedded membrane is ready.

Example 4, Fig. 4

The dive-like device

The illustration 4 shows a tub and / or a container 1 into which the wrapping material is added. In this example, the wrapping material is mixed together. For example, it is made of a dry substance 2a the by means of a liquid 2 B mixed into a wrapping material together 2c becomes. Subsequently, the membrane 3 into the serving 4 immersed. After curing and / or evaporation and / or setting and / or finishing and / or removal and / or additional post-processing, the overall structure, the embedded membrane, is ready.

Example 5, Fig. 5

The foaming and / or injection-like device

The illustration 5 shows a tub and / or a container and / or a mold 1 in which the membrane material is added. Then the container is closed 2 , Through at least one inlet, a foam and / or foam-like material and / or a multi-component foam and / or a plastic is placed in the container, whereby the container is filled with foam and / or filled. When using a two-component foam, for example, at least two inlets and / or a two-part inlet are necessary. When using plastic, additional temperature and pressure will be required. After curing and / or cooling and / or completion of the foaming or spraying process and / or curing and / or evaporation and / or setting and / or finishing and / or removal and / or additional finishing is the overall structure, the embedded Membrane, ready.

The examples given are exemplary in nature.

• – eine Kombination der genannten und/oder
• – eine veränderte Reihenfolge und/oder
• – zusätzliche Wartezeiten und/oder
• – zusätzliche Handgriffe und/oder
• – zusätzliche Werkzeuge und/oder
• – zusätzliche Verfahrenswege und/oder
• – beliebige andere Zusatzvorrichtungen

verwenden, um eine Einbettungsvorrichtung zu realisieren.Not shown are methods that

• A combination of said and / or
• - a changed order and / or
• - additional waiting times and / or
• - additional handles and / or
• - additional tools and / or
• - additional procedures and / or
• - Any other additional devices

use to realize an embedding device.

Furthermore, not shown are devices in which the embedded membrane at the time of the manufacturing process is not made of a solid material, but for example, consists of a flexible and / or liquid and / or gaseous substance and / or a mixture of substances and / or consistencies. The embedding would then be accomplished, for example, in addition to the above examples by pouring and / or injecting and / or blowing into the wrapping material.

definitions:

Membrane refers to an object that extends at least in two dimensions and that is capable of reproducing frequencies in the human hearing range when it is caused to oscillate by a corresponding drive. Examples of membranes are paperboard, honeycomb panels, rigid foams, and generally materials that have a cellular structure. Examples include honeycomb panels, rigid foam panels, gas concrete slabs or other plates that have cavity-forming structures and / or form in the manufacturing process. The cavities may also be smaller than 1 mm ³ and be present in large numbers.

Membrane-like material refers to an object which extends at least in two dimensions and which, in combination with the envelope, becomes a membrane. For example, air bubble film or glass fiber mats are referred to herein as membrane-like materials. Taken alone, they can only be used to a limited extent as a membrane. In combination with the coating, however, they have a positive effect on the resulting membrane effect.

mineral origin refers to substances consisting essentially of materials of the earth or constituents essentially of earth material. For example, construction materials include concrete, cement, gypsum, glass and similar materials.

Furthermore, all mixtures in which substances of mineral origin are included fall into this group.

chemical origin means substances consisting essentially of basic chemical substances and / or petroleum and / or petroleum-derived components. For example, plastics such as PU, PP, and the like are included.

Furthermore, all mixtures in which substances of chemical origin are included fall into this group.

natural origin refers to substances that consist of a growth process and / or components essentially produced by a growth process.

For example, herbal, animal and similar substances are included.

Furthermore, all mixtures in which substances of natural origin are included in this group.

described origin means substances which are of mineral, chemical and / or natural origin or any mixture thereof or contain in part at least one of the substances of mineral, chemical and / or natural origin.

Claims (6)

Device for a flat panel speaker with a membrane that can at least partially reproduce frequencies in the human hearing, wherein the membrane is embedded in a material such that the membrane is completely enveloped by the material, characterized in that the material is a building material for structural use is. Apparatus according to claim 1, characterized in that the building material is a mixture of at least two substances. Apparatus according to claim 1, characterized in that the building material is concrete, cement, gypsum or glass. Apparatus according to claim 1, characterized in that the membrane is encapsulated by the building material. Apparatus according to claim 1, characterized in that the membrane is formed from a building material, a plastic, a vegetable or animal substance or a mixture thereof. Device according to claim 1, characterized in that the material of the membrane is lighter compared to the material in which it is embedded.

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