阅读说明：本技术 带有可卷起的膜片的扬声器 (Loudspeaker with a rollable membrane ) 是由 R.伯斯内克 于 2018-04-05 设计创作，主要内容包括：本发明涉及一种用于播放声音的移动式扬声器设备(17)。移动式扬声器系统通常具有如下缺点：具有糟糕的音质或需要不容易待运输的装备以用于良好的音质。值得期待的是如下扬声器设备(17),该扬声器设备一方面提供良好的音质,另一方面也能容易运输。迄今这两个要求通常互相排斥。通过能耦联到扬声器设备(17)处的双稳定的或在超过两个状态下稳定的膜片(18)能够实现在扬声器设备(17)的良好的可运输性与良好的音质之间的平衡。双稳定的膜片(18)能够从稳定的运行状态被置于稳定的运输状态中。通过在双稳定的膜片(18)的两个端部处的轻的压力能够将该双稳定的膜片卷起并且由此置于运输状态中。示例性地,双稳定的膜片(18)能够在运输状态下包握柱状壳体(8),这将扬声器设备(17)部分地或完全地包围。(The invention relates to mobile loudspeaker devices (17) for playing sound, mobile loudspeaker systems generally having the disadvantage of having poor sound quality or requiring equipment that is not easily transportable for good sound quality, it is desirable for a loudspeaker device (17) that provides good sound quality on the one hand and can also be easily transportable on the other hand , the two requirements generally being mutually exclusive hitherto, a balance between good transportability and good sound quality of a loudspeaker device (17) can be achieved by a membrane (18) that can be coupled to the loudspeaker device (17) that is bistable or stable in more than two states, the bistable membrane (18) can be placed from a stable operating state into a stable transport state, the bistable membrane (18) can be rolled up and thus placed into a transport state by means of light pressure at both ends of the bistable membrane (18), the bistable membrane (18) can, by way of example, enclose a cylindrical housing (8) in a transport state, which partially or completely encloses the loudspeaker device (17).)

speaker apparatus (17) for generating sound with

-an electromechanical converter (7) for converting an electrical signal into mechanical vibrations,

a diaphragm (18) which is coupled to the electromechanical transducer (7),

it is characterized in that the preparation method is characterized in that,

the membrane (18) is embodied so as to be bi-stable,

in order to occupy either a stable operating state or a stable transport state, and

-the spatial extension of the bistable diaphragm (18) is smaller in size in the transport state than in the operating state.

2. A loudspeaker device (17) according to claim 1, wherein the bistable diaphragm (18) is rolled up in the transport state.

3. A speaker apparatus (17) as claimed in any wherein the bi-stable diaphragm (18) partially or fully encloses a cylindrical housing (8) of the speaker apparatus (17) in the transport state.

4. A loudspeaker device (17) according to any wherein the bistable diaphragm (18) is produced from spring steel.

5. A loudspeaker device (17) according to any of the preceding claims, wherein the bistable diaphragm (18) is configured such that it rolls up autonomously from the stable operating state into the stable transport state by bending.

6. A loudspeaker device (17) according to claim 3 or 4, wherein the bistable diaphragm (18) is fixed at the cylindrical housing (8) by means of a permanent magnet (1).

7. A loudspeaker device (17) according to any of claims 1 to 4, wherein the bistable diaphragm (18) is coupled to the electromechanical transducer (7) by a releasable mechanical connection.

8. A loudspeaker device (17) according to any of the preceding claims, wherein the electromechanical transducer (7) is positioned perpendicular to the bistable diaphragm (18).

9. A speaker apparatus (17) as claimed in any wherein the speaker apparatus (17) has a projection device with which light can be projected onto the bistable diaphragm (18).

10. A speaker apparatus (17) according to any of claims wherein the bi-stable diaphragm (18) of the speaker apparatus (17) has a display device for presenting images and/or video.

11, method for operating a loudspeaker device (17) for producing sound, with the steps:

-generating mechanical vibrations by means of an electromechanical transducer (7) by means of electrical signals,

-coupling the electromechanical converter (7) with a bistable or stable diaphragm (18) in more than two states, the diaphragm having a stable operating state or a stable transport state, wherein,

-transferring the bistable diaphragm (18) for coupling to the electromechanical transducer (7) from the transport state into the operating state, and wherein the bistable diaphragm (18) is spatially larger in size in the operating state than in the transport state.

Technical Field

The present invention relates to speaker apparatus for generating sound with an electromechanical transducer for converting an electrical signal into mechanical vibration and a diaphragm coupled (sometimes referred to as a linkage) to the electromechanical transducer.

Background

Document DE 102008047796 a1 describes a device for playing sound, the playing of sound being achieved by means of at least membranes which can be excited in part to vibrate transversely.

The driver for a loudspeaker is known from US 4856071 in Marquis, which is not based on a circular drive coil, but on a rectangular drive coil, said driver using elongated, rectangular magnets and coils, whereas a conventional loudspeaker uses circular magnet drivers and coils, the advantage of which is that the drive coil does not have to be wound round anymore, but can be Printed on a Circuit Board (Printed Circuit Board: Printed Circuit Board).

designs for portable speakers are known from the company ellula, which offers inflatable speakers (so-called "hot air" speakers), the disadvantage of the described structure is the inflatable volume, which lasts hours until the user inflates the speaker, the expulsion or expression of air also requires a non-negligible effort and time expenditure.

As today's smartphone technology can easily be implemented to listen to music outside of a residential building, e.g. in a park facility or a forest. It is only necessary that the music has been stored as data on the smartphone or retrieved from the internet via a mobile data connection. Since the smartphone is designed to be transportable, little installation space is available for the loudspeaker. Thus, music that sounds nice is not subjectively produced for most users. For this reason, different mobile loudspeakers are provided, which should achieve good music playback. Important requirements for the mobile loudspeaker are, for example, a low weight and a small volume (due to the desired transportability), an independent current supply which is as long as possible and, naturally, at the same time a good sound quality when music is played.

Disclosure of Invention

The object of the invention is to provide a mobile loudspeaker with improved sound quality, which at the same time can be transported easily and comfortably.

This object is achieved by the invention according to claim 1. Advantageous developments of the invention result from the dependent claims.

The invention provides a loudspeaker device for generating sound, comprising an electromechanical transducer for converting an electrical signal into a mechanical vibration and a diaphragm coupled to the electromechanical transducer.

The spatial extent of the bistable diaphragm is smaller in the transport state than in the operating state, since the diaphragm can be brought into a transport state (which is smaller than the operating state), as a result of which it is easier to transport the loudspeaker device in a picnic, for example into a park, for example, the diaphragm can assume two stable states, states for mobile sound reproduction (so-called operating states), and states are designed for easy transportability (so-called transport states).

The improvements of the present invention provide loudspeaker devices in which the bistable diaphragm is rolled up in a transport state in which it is significantly more compact and requires significantly less volume and therefore less space requirements, which is highly desirable for good transportability.

In the embodiments of the invention, patent , the bistable diaphragm partially or completely grips (sometimes called embracing) the cylindrical enclosure of the loudspeaker device in the transport state, in which case the loudspeaker device comprises a diaphragm and a cylindrical enclosure, since the diaphragm can be rolled up around the cylindrical enclosure, the diaphragm forms units with the cylindrical enclosure, whereby all the components of the loudspeaker device are compactly associated, can be transported very easily, and thereby the risk of losing the bistable diaphragm is reduced.

In another examples of the invention, the bistable diaphragm is produced from spring steel, which is a steel with a higher strength than other steels, the elasticity is achieved as a projecting property of the spring steel by the production of alloys with corresponding properties.

, the bistable diaphragm can be designed in such a way that it is rolled up autonomously from a stable operating state into a stable transport state by bending, for example, the curved cross section of the diaphragm in the stable operating state is converted into a straight cross section at the bending point, whereby a potential energy (aufbringer) is applied which is required to overcome a potential peak between the stable operating state and the stable transport state (Potentialberg), since the bistable diaphragm has, apart from the stable operating state (without external influences), only one additional stable state , namely the transport state, whereby all states lying between it are unstable, whereby, when the curved cross section of the diaphragm is disturbed at points (with reference to potential peaks), the diaphragm can be rolled up again, for example, in a completely reproducible manner into the transport state, and the diaphragm can be unrolled again from the transport state only by the force consumption which is fixedly preset, so that it occupies the normal linear operating state, and is "snapped into" under the stable operating state ".

In a further embodiments of the invention, it is provided that the bistable diaphragm is fastened to the cylindrical housing by means of permanent magnets, whereby the permanent magnets can be arranged on the outside or on the inside of the cylindrical housing.

In another variants of the fastening, the membrane is coupled to the electromechanical transducer by means of a releasable mechanical connection, such a releasable mechanical connection can be, for example, a plug-in connection, a snap-lock (sometimes called a velcro) can also be considered as a releasable mechanical connection.

In addition, it is provided in the additional embodiments of the invention that the electromechanical transducer is positioned perpendicular to the bistable diaphragm, if the electromechanical transducer is perpendicular to the diaphragm, the transmission of mechanical vibrations or mechanical shocks from the electromechanical transducer to the diaphragm is particularly effective.

If the membrane is used in addition to sound for viewing images, then another embodiments of the invention provide that the loudspeaker device has a projection device with which light can be projected onto the bistable membrane, which projection device belongs to the loudspeaker device in this variant of the invention, which projection device is designed to emit light and illuminate the membrane, in other words, can project light onto the membrane, whereby the membrane can be used as a passive projection surface, i.e. a screen of the type .

In another embodiments of the invention, it is provided that the loudspeaker device has a display device (e.g. film display, electronic paper) for presenting images and/or video, in which case no external projection device is required, in which case the images or video can be loaded from an internal memory of the loudspeaker device or retrieved via a mobile data connection to the internet.

In another embodiments of the invention, it can be provided that the electromechanical converter is embodied as a piezo actuator for generating mechanical vibrations or mechanical vibrations, the core of the piezo actuator is, for example, a piezo stack, which can contain coated piezo stack elements, if a voltage is applied to the piezo stack, at least spatial dimensions of the piezo stack change, whereby electrical signals can be converted into mechanical vibrations.

The invention also provides a method for operating a loudspeaker device for generating sound, wherein mechanical vibrations are generated by means of an electrical signal by means of an electromechanical transducer, wherein the electromechanical transducer can be embodied as a piezo actuator as explained in the preceding paragraph, wherein the electromechanical transducer is coupled to a bistable diaphragm, which has a stable operating state or a stable transport state, wherein the bistable diaphragm for coupling to the electromechanical transducer is transferred from the transport state into the operating state, which is spatially larger than the transport state.

Drawings

The invention will now be explained in more detail with the aid of the attached drawings, in which:

fig. 1 shows a schematic side view of a half-drive of an electromechanical transducer with a fixture (Quadro-Magnet-System, sometimes referred to as a four-channel Magnet System);

figure 2 shows a four magnet system on a circuit board with printed coils,

FIG. 3 shows a schematic of a four magnet system with a fixture;

fig. 4 shows a schematic diagram of an electromechanical converter in a vertical position;

fig. 5 shows a schematic diagram of an electromechanical converter (including further electronic components) in a cylindrical housing in a top view;

fig. 6 shows a schematic sketch of a loudspeaker device with a releasable membrane;

FIG. 7 shows a simplified diagram of an exemplary loudspeaker device with an unfolded diaphragm coupled at an electromechanical transducer; and

figure 8 shows a simplified diagram of a loudspeaker device in which a bistable diaphragm is rolled up around a cylindrical housing.

Detailed Description

The exemplary embodiments mentioned below are particularly advantageous embodiments of the invention. The examples describe further advantages, features and details of the invention, but can also be considered in other embodiments or combinations of features without leaving the scope of the invention.

Fig. 1 shows a driver of an electromechanical transducer 7 of a loudspeaker device 17 in a diagrammatic manner in a side view. The drive has four permanent magnets 1, and is therefore also referred to as a four-magnet system 5. The coil 4 with the winding is indicated simply in the middle. The electromechanical converter 7 has two four-magnet systems 5, as shown in fig. 1. The four-magnet system 5 comprises four permanent magnets 1, in contrast to the Marquis approach, which uses two magnets per drive. By using four permanent magnets 1, the use of pole shoes, which are regarded as disadvantageous due to the transition losses from iron to magnets, is dispensed with.

The coil 4 is set into vibration by an electrical signal in order to generate mechanical vibrations, since the coil 4 is arranged in a magnet system with two four-magnet systems 5, whereby a change in the current strength induces a mechanical movement of the coil 4 on the basis of the induction principle, the combination of the two four-magnet systems 5 can also be regarded as a "sandwich magnet system", the coil 4 and the four-magnet system 5 being shown by way of example in the sketch in fig. 2 starting from , the coil 4 in this case being printed on a circuit board, the coil carrier can be for example paper impregnated with phenolic resin or epoxy resin, the coil 4 is formed in this example by a red copper track, which is a winding, the cut-outs in the circuit board material being responsible for the weight reduction, which are arranged for example along the centre axis of the circuit board, however only cut-outs can be seen in fig. 2.

In fig. 2, pure iron 2 is provided as a carrier element for a four-magnet system 5. The carrier element can also comprise plastic, however pure iron 2 offers the following advantages: intensifying the magnetic flow and thereby improving the action of the magnet system. In order to additionally intensify the magnetic flow, it can be provided that in the "High End-variant" (High End-variant), the pure iron 2 is additionally ground or polished at the point where it touches the permanent magnet 1 with said surface. When using pure iron 2 as a carrier element of the four-magnet system 5, the permanent magnet 1 does not have to be glued to the carrier element, since the force of the permanent magnet 1 is so great that it adheres to the pure iron 2 alone. Different permanent magnets 1 can be used depending on the design of the loudspeaker device 17. N42 to N50 magnets are generally used because the magnetic force of the magnets is large enough that the magnets remain attached to the pure iron 2 without problems.

However, the permanent magnets 1 shown in fig. 2 attract each other so that they approach each other and come into contact in the shortest time, in other words, the system shown in fig. 2 is unstable in case of a shock, the permanent magnets 1 do not remain in their position in case of a shock, but attract and come into contact, it is therefore necessary to provide a fixing structure which prevents the permanent magnets 1 from leaving their position even in case of a shock, fig. 3 shows exemplarily a four-magnet system 5 with a fixing device 3, the fixing device 3 is placed on pure iron 2 and provides a gap for the permanent magnets 1, the permanent magnets 1 are located and thereby fixed in said gap, furthermore, the fixing device 3 can be configured for holding the coils 4 within a sandwich magnet system and defining and ensuring the spacing of two four-magnet systems 5.

The fixing device 3 serves as a spacer element and can be produced from aluminum or plastic. Other metallic or ceramic materials can also be used as spacing elements. The fixing device 3 is able to keep the upper and lower permanent magnets 1 at the correct spacing and can have additional holes and threads that enable: the sandwich magnet system is for example fixed in a frame or the like. A fastening device for fastening the coils in the four-magnet system 5 can also be arranged at the fastening device 3. I.e. the width of the gap between the two four-magnet systems 5 can be adjusted to each other by means of the fixing device 3. A smaller overall height of the loudspeaker device 17 can thereby be achieved if the pure iron 2 extends over the two permanent magnets 1 (as shown in fig. 2 and 3). This can be important for extremely flat speakers. However, the width of the speaker device 17 is increased in this case. The fixation device 3 can be obtained, for example, by milling.

If two four-magnet systems 5 (as shown in the diagram in fig. 3) are fitted at , an electromechanical converter 7 is produced, which electromechanical converter 7 can be regarded as a diagram of a prototype in the vertical position in fig. 4, the two four-magnet systems 5 can be fixed to one another, for example by means of an M3 screw fastening, as shown in fig. 4, additionally washers or spacers can be used in order to align the air gap between the two four-magnet systems 5, furthermore, the screw fastening can be used to fix the electromechanical converter 7 later on the cylinder housing 8 of the loudspeaker device 17, a circuit board with printed coils is embedded in the gap between the two four-magnet systems 5 in such a way that the circuit board can move back and forth within the magnetic field, the double arrows drawn show the direction of movement 6 of the circuit board coils as they flow with alternating current, the amplitude of the direction of movement 6 being in this embodiment about 4 to 5 mm, these mechanical vibrations or mechanical shocks being transmitted to the bistable diaphragm 18 in the course of .

The electromechanical transducer 7 can be arranged in a cylindrical housing 8 of a loudspeaker device 17, as is shown by way of example in fig. 5. Fig. 5 shows a schematic top view of the loudspeaker device 17, wherein the interior of the loudspeaker device 17 is drawn in a schematic representation. The circuit board coil is designed such that it protrudes from the four-magnet system 5 and reaches the outside of the housing 8 through an opening 9 at the housing 8. Where the securing element 10 for the bistable diaphragm 18 is located. In this embodiment, the securing element 10 is a permanent magnet 1.

In order that the coil 4 does not rattle in the air gap of the two four-magnet systems 5 or completely falls out of the air gap, additional fastening means can be provided, so that the coil 4 can perform its movement at least partially unhindered. The securing device can be, for example, a centering webbing (zentirnestine) 11. In the example of fig. 5, further electronic components are arranged within the loudspeaker device 17, constrained by the housing 8. I.e. in this example there is an amplifier circuit board 12 with an integrated amplifier module 13, a radio antenna 14, an energy buffer 15 and a radio and/or charging device 16. The radio 16 can be used, for example, to implement a mobile bluetooth speaker.

Fig. 6 schematically shows that the loudspeaker device 17 comprises a bistable diaphragm 18 which is unfolded in the stretched state, which bistable diaphragm 18 can be produced, for example, from spring steel and can be transferred from stable states into a second stable state with relatively little effort, for example, by bending (in which convex or outwardly arched sections move towards one another), fig. 6 shows the bistable diaphragm 18 in its operating state, if the loudspeaker device 17 is to be activated for an exemplary music playback, the bistable diaphragm 18 can be coupled to the loudspeaker device 17 via the fastening element 10, whereby the mechanical vibrations generated by the electromechanical transducer 7 can be transmitted to the bistable diaphragm 18, whereby the bistable diaphragm 18 is excited and puts the surrounding air into vibration, which can be interpreted by a person with correspondingly good hearing as music.

In addition, this structure enables to quickly end the music playback. In this case the bistable diaphragm 18 is simply removed from the loudspeaker device 17. As a result, mechanical vibrations can no longer be transmitted to the membrane 18, so that the surrounding air can no longer be excited by the bistable membrane 18. Thereby, the music is calmed down.

Furthermore, it can be provided that the bistable diaphragm 18 is embodied as a projection surface or as a display device. If the bistable diaphragm 18 is designed as a projection surface, an external projection device can, in the operating state, effect the projection of light onto the bistable diaphragm 18. It is possible, for example, to display an image or animation on the bistable diaphragm 18 by means of a mobile portable projector. This can be applied, for example, in paring, in which case YouTube video is presented via a projector.

Furthermore, it is also possible that the bistable diaphragm 18 itself is a display device. I.e. the bistable diaphragm 18 can be embodied as or with an OLED film or electronic paper, for example. These techniques enable: the bistable diaphragm 18 is thin enough to be implemented as a display device. Furthermore, it is possible to receive images or videos from a mobile data network or a local WLAN network via the radio antenna 14 in order to display them on the bistable diaphragm 18.

In this case the bistable diaphragm 18 and the loudspeaker device 17 function as a class of mobile television in this embodiment, no additional external projection means are required, it can also be provided that, in addition to receiving images or video from a WLAN connection or a mobile data network, images or video are already stored in a memory internal to the loudspeaker device 17, whereby images or video can also be displayed or shown without a data connection to the mobile data network or WLAN network.

Fig. 7 shows a schematic representation of a loudspeaker device 17 as a prototype, in which a coupled bistable diaphragm 18 is extended in the operating state. The bistable diaphragm 18 is in this example magnetically coupled to the housing 8 of the loudspeaker device 17. In this prototype, the bistable diaphragm 18 is implemented as a buckle strap, as it is used in a cyclist. The cyclist uses the buckle strap to prevent the pants from coming into contact with the bicycle chain.

In the present invention, however, the bistable diaphragm 18 serves as a module for playing sound. The rollable bistable diaphragm 18 can be manufactured in different sizes. The bistable diaphragm 18 shown in fig. 7 has a width of about 2 cm and can therefore provide only a relatively small sound intensity. In this connection, it is known to the inventors that bistable diaphragms 18 with a width of up to 25 cm and a length of up to 50 cm (and more if possible) can be produced. This enables a significantly louder sound to be produced than with a diaphragm having a width of only 2 cm. The bistable diaphragm 18 can be easily removed from the housing 8 due to the magnetic coupling.

Furthermore, the bistable diaphragm 18 can be brought into rolling by applying a light pressure to both ends of the bistable diaphragm. The bistable diaphragm 18 is thereby brought from the operating state shown in fig. 7 into the stable transport state shown in fig. 8. If the bistable diaphragm 18 is brought to roll by applying light pressure on both ends, the bistable diaphragm 18 rolls up relatively quickly due to the spring steel properties. Said properties are also found under the name "fastener tape".

If the bistable diaphragm 18 is brought to roll up, then: the bistable diaphragm is guided around the cylindrical housing 8 of the loudspeaker device 17. Here, a winding of the bistable diaphragm 18 around the cylindrical housing 8 occurs. Fig. 8 shows a schematic view of a loudspeaker device 17 with a bistable diaphragm 18 in a transport state.

It is also possible to fasten the bistable diaphragm 18 to the housing 8 or the fastening element 10 in a non-releasable manner, so that a spatial separation of the bistable diaphragm 18 and the loudspeaker device 17 is no longer possible. In this case, the coil 4 and the diaphragm 18 are connected to one another in a material-locking manner. In order to reach the operating state, the bistable diaphragm 18 must be stretched. For transport, the bistable film is placed in a transport state by rolling up the bistable film by applying pressure to both ends. The advantages of the material-fit connection are: it is not possible to lose the bistable diaphragm 18. Disadvantageously, however, the bistable diaphragm 18 cannot be replaced.

The loudspeaker device 17 can be lifted (erweitern) in a meaningful manner by means of the bistable diaphragm 18. Thus, music can be played with better sound quality. Because the membrane 18 is bistable, this also makes it possible to place the bistable membrane 18 in a practical transport position. The result is a loudspeaker device 17 which provides good sound quality and at the same time can be easily transported, i.e. is very mobile.

Document DE 102008047796 a1 discloses the use of a membrane as a diaphragm for a face loudspeaker, which earlier document however contains a number of weaknesses which are overcome by the present invention the membrane in the earlier disclosure is either very rigid and cannot be wound up or the membrane can be wound up but is not rigid enough to be able to be used as a diaphragm.

The present invention provides bistable diaphragms 18 which are sufficiently stable in respect of and sufficiently flexible in respect of to provide an operating state and a transport state, furthermore, in the earlier document DE 102008047796 a1, a vibration exciter is fixed at the membrane in order to realize the loudspeaker, but whereby the membrane can no longer be completely wound up, since the vibration applicator as described cannot be embodied to be flexible either.

Overall, the example shows how a balance between good sound quality and good transportability can be achieved with the invention in the case of mobile loudspeakers. A relatively large area can be provided as a loudspeaker by the bistable diaphragm 18, which can be easily placed in a transport state after use. Furthermore, the bistable diaphragm 18 can form a practical unit with the loudspeaker device 17 in the transport state.