KR101647916B1 - Sound generating apparatus - Google Patents

Abstract

An apparatus comprising an electromagnetic coil and a magnet system. The electromagnetic coil includes an electrical lead. The magnet system forms an electrical conductor connected to the electrical leads of the electromagnetic coil. The magnet system is configured to provide an electrical interface.

Description

SOUND GENERATING APPARATUS

Exemplary, non-limiting embodiments relate generally to a magnet system for use with an electromagnetic coil, and more particularly to an electrical connection provided by a magnet system.

The loudspeaker generally has a magnet, a coil and a diaphragm. The coil is electrically connected to another member by a wire or a contact.

The following summary is intended to be exemplary only. The summary is not intended to limit the scope of the claims.

According to one aspect, an apparatus is provided that includes an electromagnetic coil and a magnet system. The electromagnetic coil includes an electrical lead. The magnet system forms an electrical conductor connected to the electrical leads of the electromagnetic coil. The magnet system is configured to provide an electrical interface.

According to another aspect, a method includes providing a magnet system comprising at least two magnet pieces and at least two magnet pieces connected to non-different magnetic poles of at least one magnet, And electrically connecting the electrical leads. Each pole piece of the pole piece is electrically isolated from one another to provide a separate electrical conductor to the electrical lead of the electromagnetic coil.

According to yet another aspect, the method includes transmitting current to the electromagnetic coil through the first pole piece of the magnet system and transferring current from the electromagnetic coil through the second pole piece of the magnet system.

The following and other features are set forth in the following description, which is to be interpreted relative to the accompanying drawings.
Figure 1 is a perspective view of an exemplary embodiment.
Figure 2 is a diagram illustrating some of the components of the device shown in Figure 1;
Figure 3 is a partially enlarged perspective view of the components of the apparatus shown in Figure 1;
4 is a perspective view of the upper portion of the loudspeaker shown in Fig.
5 is a perspective view from the opposite lower side of the loudspeaker shown in Fig.
Figure 6 is a schematic cross-sectional view of a portion of the apparatus shown in Figure 1;
7 is a perspective view showing the loudspeaker shown in Figs. 3 to 5 without a housing.
8 is a side view of the loudspeaker shown in Fig.
9 is a bottom plan view of the loudspeaker shown in Figs. 7 and 8. Fig.
FIG. 10 is a similar view to FIG. 7 showing an exemplary alternative embodiment.
Figure 11 is a schematic side view of yet another alternative embodiment.
11A is a side view of another exemplary embodiment.
11B is a side view of another exemplary embodiment.
Fig. 11C is a diagram showing magnetic poles of the magnet shown in Fig. 6;
FIG. 11D is a diagram similar to FIG. 11C showing yet another example.
12 is a diagram illustrating an exemplary method.
13 is a diagram illustrating another exemplary embodiment.
Figure 14 is a diagram illustrating another exemplary embodiment.
15 is a diagram illustrating another exemplary embodiment.
16 is a diagram illustrating another exemplary embodiment.
Figs. 17-25 illustrate different exemplary embodiments for an electrical isolation feature having a pole piece substantially electrically isolated from one another.

Referring to Figure 1, there is shown a perspective view of an apparatus 10 that includes features of an exemplary embodiment. Although the features are described with reference to the exemplary embodiments shown in the drawings, it should be understood that the features may be embodied in many alternative forms of embodiment. In addition, any suitable size, shape or type of component or material may be used.

In this example, the device 10 may be a phone application, an Internet browser application, a camera application, a video recorder application, a music player or recorder application, an email application, a navigation application, a gaming application, and / Portable electronic device. In this exemplary embodiment, the apparatus 10 includes a housing 12, a touch screen 14 that functions as a display and user input, a receiver 16, a transmitter 18, at least one processor 22, A controller 20, which may include a memory 24 of the computer 20 with software, and a rechargeable battery 26. However, these features are not necessary to implement the protection described below. For example, a touch screen or additionally a conventional keypad or other user input may be used. Thus, the feature may be used only in any suitable type of device, such as, for example, a telephone.

The device 10 also includes a speaker or earphone 28 and microphone 30, each of which includes an acoustic transducer. Still referring to Fig. 3, the apparatus 10 also includes a loudspeaker 40. The loudspeakers 40 are shown in Fig. The housing 12 includes at least one acoustic hole 32 for acoustic movement from the speaker 28, at least one acoustic hole 34 for micro-moving acoustic, And at least one acoustic hole (33). The following description relates to the area in the loudspeaker 40. However, the features described are equally applicable to other coil / magnet assemblies. The features of the present invention can be used, for example, in a speaker 28.

4 to 6, the loudspeaker 40 is an acoustic transducer. The acoustic transducer includes a magnet system 41, a coil 44, and a diaphragm 38 connected to the coil 44. The magnet system 41 includes two permanent magnets 42a and 42b and four pole pieces 48a, 48b, 49a and 49b. In an alternative embodiment, the magnet may be an electromagnet. In the example shown in the figure, the magnet system 41 consists of two magnet subsystems 46a and 46b. The first magnet subsystem 46a includes a first permanent magnet 42a and first pole piece 48a, 49a. The second magnet subsystem 46b includes a second permanent magnet 42b and second pole piece 48b, 49b. The poles of the magnets 42a and 42b are basically aligned in the same direction to function as a single permanent magnet. In an alternative example, more than four stimulating strips may be provided. In the illustrated example, the outer periphery of the diaphragm 38 is connected to a housing 50, which can be mounted on the back side of the frame piece 52 (see FIG. 3). The magnet 42 and the pole pieces 48 and 49 form a region 54 in which the coil 44 moves.

The two magnetic subsystems 46a, 46b are spaced apart from each other by a gap 68. The two magnetic subsystems 46a and 46b are not directly connected to each other. Instead, the two magnet subsystems 46a, 46b are each connected to a printed wiring board (PWB) 21. Thus, the PWB 21 mechanically connects the two magnet subsystems 46a, 46b to each other indirectly. In an alternative embodiment, all appropriate mechanical connections to each other of the magnetic subsystems 46a, 46b can be provided so long as two isolated electrical conductor paths are provided. For example, the housing 50 may provide such a mechanical connection function.

The pole piece is a structure composed of a high magnetic permeability material that serves to guide the magnetic field generated by the magnet. The stimulating piece is attached to the stimulus of the magnet to extend the stimulus of the magnet to some extent and thus has such a name. The magnetic flux will travel along a path that provides a minimum amount of resistance (or more precisely a minimum amount of magnetic resistance) to the magnetic flux. In magnetic circuits, steel components provide a low magnetoresistive path to the flux. This fact allows the use of steel pole pieces to capture the flux and concentrate the flux to the point of interest (or just guide the flux back).

Focusing of the flux can be achieved by tapering the steel. It should be noted, however, that as the area of the irritation of the steel stimulus piece decreases, the flux density in steel B will increase (if the overall flux moving through the steel component remains constant). Steel pole pieces may also be used to make the magnetic field uniform over the active volume.

It is difficult to manufacture a magnet with a complicated shape that may be required, and accordingly, a magnetic pole is expensive, so a pole piece is required. The pole pieces are used with permanent magnets and electromagnets. In the case of an electromagnet, the pole piece or the plurality of pole pieces may simply be considered as part of the electromagnet even when the pole piece is made of the same material, especially when the magnetic core is simply extended. The traditional material for the stimulus piece was soft iron. While soft iron is still often used with permanent magnets, soft iron suffers from eddy currents that make them unsuitable for use with electromagnets, and is inefficient, especially when magnets are excited by alternating currents. The stimulating piece has many shapes and shapes depending on the application example. Traditional dynamic loudspeakers have a unique annular magnet and pole piece structure that serves to concentrate the magnetic flux on the voice coil. The cylindrical pole piece at the center surrounded by the voice coil is typically referred to as a pole piece. Finally, the second pole piece surrounds the voice coil.

In the case of the loudspeaker 40, when the direction of the current flowing through the voice coil 44 changes, the polarity of the polarity of the coil is reversed. This changes the magnetic force between the voice coil and the permanent magnet / pole piece to move the coil and attached diaphragm back and forth.

The electromagnet is located in a constant magnetic field produced by the permanent magnet 42 and the pole pieces 48, 49. Since all two magnets interact with each other, the electromagnet and the permanent magnet interact with each other. The two magnetic poles of the electromagnet are pulled by the negative magnetic pole of the permanent magnetic field and the negative magnetic pole of the electromagnet is repelled by the negative magnetic pole of the permanent magnet. When the pole orientation of the electromagnet is switched, the repulsive force and the direction of attraction are also switched. In this way, the alternating current constantly reverses the magnetic force between the voice coil and the permanent magnet. This quickly pushes the coil back and forth like a piston.

As the coil moves, the coil pushes and pulls on the diaphragm 38. This vibrates the air in front of the diaphragm to generate sound waves. An electrical audio signal can also be interpreted as a wave. The frequency and amplitude of these waves, representing the original sound waves, affect the speed and distance at which the voice coil travels. This ultimately determines the frequency and amplitude of the sound waves generated by the diaphragm.

7 to 9, the loudspeaker 40 is shown without the housing 50. The opposite ends 56,57 of at least one wire forming the coil 44 extend outwardly from the coil and are electrically connected to a portion 58 of the pole pieces 48a, 48b. The ends (56, 57) form an electrical lead to the coil (44). In an alternative embodiment, any suitable type of connection may be provided between the pole piece and the coil. The length and shape of the leads 56 and 57 allow the coil 44 to move relative to the pole piece without damaging the lead. In other words, the leads 56 and 57 form a flexible electrical connection between the coil and the pole piece.

The leads 56,57 may be wired to a portion 58 for example or slip fit connected like a loop on a portion 58, for example. All appropriate connections can be provided. The pole pieces 48a and 48b form a unique electrical connection to the coil 44. [ Thus, the pole pieces 48a, 48b serve as pole pieces for the magnets 42a, 42b and as electrical terminals for the coils 44. [ An air gap 68 is provided between the two pole pieces 48a, 48b to maintain electrical isolation of the two pole pieces 48a, 48b from each other. In an alternative embodiment as shown in FIG. 10, an electrically insulating material 70 may be provided in the gap 68. This electrically insulating material 70 may also function to mechanically connect the two magnet subassemblies 46a, 46b as a single magnet assembly prior to connection to the PWB 21 as well.

As shown in Figures 5 and 9, the outer facing portion 62 of the pole piece 48a, 48b forms a contact area or pad 60, 61 for connection to another member. Thus, the outer facing portion 62 and the contact regions 60 and 61 form an electrical interface for mechanical connection and electrical connection to another member. 6, in this example, the outer facing portion 62 of the pole piece 48a, 48b is positioned directly opposite the printed wiring board PWB 21 of the controller 20. The contact areas 60 and 61 are electrically connected directly to the contact pads 64 and 65 of the PWB 21. A current can be provided through the coil 44 from the pad 64 to the contact area 60, through the first pole piece 48a, to the first coil lead 56, and to 57, 48b, 61, and 65 Lt; RTI ID = 0.0 > PWB. ≪ / RTI >

The above-described characteristic can also be used in an electrodynamic loudspeaker which does not use a permanent magnet. The above-described features may be most beneficial in loudspeakers used in small size-constrained devises where cost is also a major concern.

The smaller size of the loudspeaker raises various challenges. The best possible performance is required from the smallest possible loudspeaker size. This means that the way to simplify and reduce the mechanical structure of the loudspeaker without affecting the performance must be continuously considered. Another equally important area to optimize is performance versus price.

The electrical connection to the loudspeaker is usually handled by two contact springs that push onto the corresponding pads on the printed wiring board (PWB) beneath the loudspeaker. Another common method is to provide a solder pad on the loudspeaker and the wire can be soldered to the solder pad. These springs or pads are then internally electrically connected to the voice coil of the loudspeaker (for example by welding). The voice coil is located in a strong permanent magnetic field to produce sound by providing a force to drive the loudspeaker diaphragm. In most small loudspeakers a single magnet is used. A few loudspeakers use two or more magnets.

The above-described features can have a magnet system (magnet + magnetic pole piece) substantially divided into two parts electrically isolated from each other, for example two halves. These two separate parts perform two tasks as a magnet system and as an electrical contact point. Therefore, it is possible to remove a conventional separate contact spring or pad, which saves cost and space.

The division of the magnet system is performed in such a way that the magnetic field in the air gap 54 (where the voice coil 44 is located) is reduced as little as possible. The ends 56, 57 of the voice coil wire are connected to appropriate points on each of the magnetic subsystems 46a, 46b. The lower part 62 of the magnetic subsystem 46a, 46b now provides electrical contact pads 60, 61 for the loudspeaker. Alternatively, the components of the magnet assembly may also be exposed and held on the side of the loudspeaker, thereby providing a contact pad thereon.

Using the features of the exemplary embodiments described above, the magnet system can be divided into at least two parts electrically isolated from each other, and a split is formed such that at least two pole pieces are electrically connected to an electrical terminal for the wire from the coil, Can be manufactured in a manner that can be used as a contact point.

It should be noted that in alternate embodiments, the gaps may be oriented in a manner different from that shown in the figures. Also, the gap between the magnet system components need not be empty, but may be filled with material 70 such as, for example, an adhesive, or may be filled with any material that is generally electrically non-conductive or at least of high electrical resistance .

It should also be noted that the small width of the gap 68 has only a small or no effect on the performance of the loudspeaker. The gap between the conductive parts of the magnet system can be designed to impair the performance of the adjacent antenna as little as possible. In other words, the precise dimensions of the various isolated components can be selected to achieve the desired response to an external RF field.

Advantages can include:

· A fairly simple mechanical configuration of the loudspeaker itself (no separate contact springs or pads)

· The low cost of the loudspeaker itself (whether the overall cost also becomes cheaper depends on the chosen access method)

· The possibility that the loudspeaker size will be smaller for a given performance

The likelihood of higher thermal power handling capacity (which need not be directly related to the present invention but depends on other details)

· High reliability (fewer components and simpler configuration usually lower the risk of failure)

The possibility of an advantage of antenna integration (the smaller the adjacent volume of conductive material, so the effect on the performance of the adjacent antenna is smaller than if it is a normally constructed loudspeaker of the same size)

In one type of example, the entire magnet system can be substantially divided into two parts that are electrically isolated from each other. This allows the pole piece attached to the magnet system to be used as two electrical terminals. The coil wire may be welded (or mechanically and electrically differently attached) to the pole piece. Additional modifications are possible. The half of the magnet system may include a protruding solder pad on the side of a loudspeaker or the like, for example.

Thermal conduction from the voice coil 44 to the surrounding machine structure can be improved by a good design. Voice coils are connected to the magnet subsystems 46a, 46b, which provide a more efficient heat sink than the conventional contact springs. This is particularly true when a less common solution such as a loudspeaker spider is used because it will provide a very efficient thermal conduction potential from the voice coil to the magnet subsystem 46a, 46b.

In an exemplary alternative embodiment, a single permanent magnet may be used within the magnet system 41 if the pole pieces 48a, 48b are kept electrically isolated from one another in the magnet system. An example of this is shown in Fig. The magnet system may include one permanent magnet 42 and three pole pieces 48a, 48b, 49. In this example, the magnet system still comprises two magnet sub-systems with electrically isolated pole pieces 48a, 48b, each magnet sub-system including a portion of the same single magnet 42. [ In the illustrated example, the two parts or subsystems 72, 73 form one half of the magnet system using an electrical insulator 70 which at least partially mechanically couples the two parts, respectively. In this example, the magnet 42 is comprised of an electrically non-conductive material. However, as described in the exemplary embodiment described below in FIGS. 17-25, the magnet 42 may be constructed of an electrically conductive material, wherein the electrically insulating material is disposed between at least one pole piece of the pole piece and the magnet . As a further alternative, 48 and 42a may be formed as a single magnet rather than a pole piece connected to a magnet. Likewise, 49 and 42b can be formed as a single magnet rather than a magnetic pole piece connected to a magnet. The electrical insulator 70 should not excessively damage the magnetic circuit if the electrical insulator 70 is located between the magnet and at least one pole piece of the pole piece. The insulating layer may have a high transmittance despite being electrically non-conductive.

Fig. 11B shows another example in which the magnet system includes two permanent magnets 42a and 42b and three pole pieces 48a, 48b and 49. Fig. The stimulating piece 49 holds two magnets 42a and 42b mechanically connected to each other within a single assembly but may still allow the stimulating pieces 48a, 48b and 49 to be not directly electrically connected to each other.

In most conventional loudspeakers there is one magnet and two pole pieces. A few loudspeakers may have a greater number of magnets and pole pieces, for example, three magnets and four pole pieces, or perhaps even five magnets and six pole pieces. These magnets and pole pieces are not intentionally electrically insulated from each other. Neodymium-based magnets are typically used in at least some mobile phone loudspeakers. The provision of the electrically insulating material intentionally between the stimulating piece and the magnet will not carry out any purpose in a conventional loudspeaker.

Features such as those described herein may differ from typical loudspeakers in that the magnet system is no longer a single electrically conductive block. Instead, two (or more) subsystems electrically isolated from each other may be provided. This means that the most common kind of magnet system consisting of one magnet and two pole pieces, for example, can be substantially two magnets and four pole pieces when divided into two halves.

Referring to Fig. 11C, the N pole and the S pole of the magnets 42a and 42b are shown in the case of the example shown in Fig. Of course, the N poles and the S poles may be alternated in different examples. Figure 11d shows yet another example having more magnets and pole pieces.

One type of exemplary device (e.g., 40 or 10) may include one electromagnetic coil 44, which includes opposing electrical leads 56, 57 and electrical conductors (not shown) connected to the electrical leads of the coils 48a, 48b, the magnet system being configured to electrically connect the coil to another member (21).

The electrical lead may include opposite ends of the electrical wire forming the coil. The electrical lead may include a conductor connecting the opposite electrical end of the coil to the magnet system. The magnet system may include at least one permanent magnet and at least two pole pieces connected to non-different poles of the at least one permanent magnet. For example, when a single permanent magnet is used, the non-different magnetic poles may be N poles, and in the embodiment having two magnets, the non-magnetic poles may be N poles of both permanent magnets. The at least one permanent magnet may comprise a single permanent magnet. The apparatus may further comprise an electrical insulator for electrically insulating the first magnetic pole piece and the second magnetic pole piece at least partially from each other. The electrical insulator may be at least partially positioned between the first pole piece and the at least one permanent magnet. The magnet system may comprise at least two pole pieces connected to at least one permanent magnet and at least one permanent magnet and the device comprises at least one pole piece of the pole piece at least partially electrically insulated from the at least one permanent magnet, The electrical insulator.

In one exemplary embodiment of this type, a magnetic system comprising an electromagnetic coil comprising an electrical lead, a magnet system including two pole pieces connected to a first permanent magnet and a first permanent magnet, and a magnet system including at least one of the first permanent magnet and the pole piece Wherein at least one pole piece of the pole piece forms an electrical conductor connected to at least one electrical lead of the electrical leads of the coil.

11A, at least one pole piece 49 may have an electrical conductor 92, such as a trace, isolated from the main material of the pole piece by insulator 92 at the top of the pole piece, The conductor 92, which is part of the magnet system and is included integrally on the pole piece 49, provides electrical connection to the rest of the coil. In this type of situation, the magnet system can have only one pole piece. At least one permanent magnet comprises a first sub-assembly (72) comprising a first permanent magnet assembled with a first magnetic pole piece of the pole piece and a second permanent magnet (73) assembled with the second pole piece of the pole piece And the first and second assemblies are connected to one another to form a magnet system. The magnet system may comprise a first magnetic pole piece and a second magnetic pole piece, wherein the first magnetic pole piece and the second magnetic pole piece are electrically insulated from each other, the first magnetic pole piece and the second magnetic pole piece, And is electrically connected to another member. The first pole piece and the second pole piece may each include an electrical contact pad (60, 61) configured to electrically connect the magnet system to another member. The device 40 may further include a diaphragm 38 mechanically connected to the coil. The device may be a small electronic device including a printed wiring board 21 and the magnet system includes at least two pole pieces electrically connected to the contact pads 64 and 65 of the printed wiring board.

12, one exemplary method includes providing at least two magnetic subsystems having at least two magnetic pole pieces connected to non-different magnetic poles of at least one magnet and at least one magnet, as indicated by block 80, And connecting electrical leads to each of the pole pieces of the pole piece from the electromagnetic coil as indicated by block 82, wherein each pole piece of the pole piece has a separate < RTI ID = 0.0 > Are electrically isolated from one another to provide electrical conductors.

The pole piece is usually a flat plate of material attached to the magnetic pole. The purpose of the stimulus piece is to act as a kind of "conductor" for the magnetic field. Thus, in one exemplary embodiment, each half of the magnet system will have two pole pieces (one on each pole of each magnet). Thus, there will generally be four stimulus pieces. In one exemplary embodiment in which the magnet system is divided into more than two mutually isolated magnet pieces, the pole pieces of only two of the magnet pieces can be used for electrical connection. Larger but smaller components are less likely to interfere with the RF antenna. In another exemplary embodiment, the transducer may include two voice coils and two magnets, and two diaphragms may be positioned on opposite sides of the assembly. In another exemplary embodiment, the transducer may include two voice coils, two diaphragms, and a single magnet.

The step of providing the magnet system may include a step wherein at least one magnet is a single permanent magnet. Wherein the step of providing the magnet system comprises the steps of connecting at least one magnet to two separate permanent magnets, connecting the first pole piece of the pole piece to a first pole of the first permanent magnet of the permanent magnet, And connecting the magnetic pole pieces to the first magnetic pole of the second permanent magnet of the permanent magnets. The step of connecting the electrical leads comprises the steps of directly connecting the first end of the wire forming the electromagnetic coil to the first magnetic pole piece of the magnetic pole piece, As shown in FIG. The method may further comprise electrically connecting the electrical contact pads on each of the pole pieces directly to the electrical contact pads of another member. The method may further comprise filling the gap between opposite ends of the pole piece with an electrically non-conductive material. The step of providing the magnet system may include at least partially electrically insulating the permanent magnet from at least one pole piece of the pole piece to electrically isolate the pole piece from one another. Providing the magnet system may include providing at least partially an electrical insulator between the first of the at least one magnet and the at least one magnetic pole piece of the magnetic pole piece. Providing the electrical insulator may include providing a direct electrical insulator between the two pole pieces of the pole piece. The step of providing a magnet system may comprise the step of connecting at least two pole pieces to a non-different pole of at least one magnet.

Another exemplary method includes the steps of transferring current to the electromagnetic coil through the first pole piece of the magnet system and transferring current from the electromagnetic coil through the second pole piece of the magnet system.

In one example, one pole piece of the pole piece is divided, and both of these pole piece parts are attached to the same pole of the same magnet. In this case, one or both of the pole pieces should be electrically isolated from the magnet, but not necessarily magnetically isolated, otherwise the electromagnetic coil will short out. Although this is possible, it requires an appropriate material (i.e., a material that is electrically non-conductive but has a high magnetic permeability) between the pole piece and the magnet.

13, there is no contact spring between the coil 44 and the printed wiring board 21 in one exemplary embodiment, and the half of the magnet system (some additional pads on the PWB 21) (Supported on the base plates 64, 65) and serving as electrical contacts. 14, in one exemplary embodiment, the magnet system halves 146a and 146b are in direct contact with the PWB 21. In one embodiment, 15, in one exemplary embodiment, the outer spring 200 is in electrical contact with the magnet system halves 146a and 146b. 16, in one exemplary embodiment, wire 202 is soldered / welded to a pad formed by magnetic system halves 146a, 146b.

Using an exemplary embodiment having the features described herein, the electrical connection between the coil and the magnet system can provide a heat transfer path for the magnet system to provide a heat sink for the coil. A portable electronic device 10 may be provided that includes an antenna 19 (see FIG. 1) positioned adjacent to the device and apparatus 40 as described above and may be provided with a gap (or a gap) between the conductive parts of the magnet system The plurality of gaps) are configured not to substantially impair the performance of the antenna to achieve a predetermined desired response to the external RF field.

17, the assembly 200 includes a single magnet 42, three pole pieces 48a, 48b, 49, an electrical insulator 202, a diaphragm 38, a coil 44, and a lead 56 0.0 > 57, < / RTI > This example shows that the manufacturer can avoid having to split all the magnets using this type of design. The electrically insulating material or insulating layer 202 is at least partially electrically insulating. The electrically insulating material or insulating layer 202 does not necessarily have to have a high permeability, but it can be helpful to have a high permeability.

In various different exemplary embodiments, where all the electrical insulation features are present, this insulation feature may be a simple air gap or a gap filled with partially electrically charged material (e.g., non-conductive adhesive) or a partially filled gap. These materials can also have high permeability. The electrically insulating material need not be an exact insulator. The electrically insulating material may also have a sufficiently high electrical resistance to provide a sufficiently good insulation to avoid degrading the performance of the loudspeaker. 18-23 illustrate various different exemplary embodiments using an electrical insulator 204, 206, 208, 210 that may include an air gap and / or an electrically insulating material.

In a conventional loudspeaker, the stimulating piece is glued or otherwise attached to the magnet. If an adhesive is used, the adhesive can actually create a small gap between the magnet and the stimulating piece even in a conventional loudspeaker, but this gap is kept as small as possible to avoid degrading the magnetic field where the voice coil is located. Keeping them intentionally electrically isolated from one another does not provide any benefit in conventional loudspeakers, and therefore intentional and controlled isolation is not intentionally provided. Therefore, it is not carried out in a conventional loudspeaker to intentionally electrically isolate the stimulating piece and the magnet. Instead, the amount of adhesive is kept as small as possible, resulting in a result that electrical insulation is not guaranteed in a conventional loudspeaker.

The isolation features described above with reference to the illustrated embodiment can be made as thin as possible (whether the insulation feature is air or an electrically insulating material). This is because if the insulation characteristic is too wide, the strength of the magnetic field in the voice coil is lowered. However, if the insulating material also has a high magnetic permeability, the insulating characteristics can be made less thick and thicker.

The leads of the coils may be connected to any point on the entire bulk of the adjacent conductive material forming one of the electrical terminals. Thus, for example, the wire may be connected to the pole piece at the top as shown in Fig. The leads 56,57 may also be connected to the magnet as shown in Figure 24 and / or may be connected to the pole piece at the bottom as shown in Figure 25, or to one pole piece at the top, , Or in other combinations. It is not important, in their particular embodiment, that their pole pieces and magnet assemblies each form a single mass of conductive material anyway.

The magnet may also be formed of a material that is not electrically conductive. If the material used for the magnet is not electrically conductive, a separate electrical insulator between the magnet and one or more of the pole pieces may not be required.

Although the figure shows that a lead or wire from a coil is present outside the magnet system (i.e., adjacent to the outer rim of the loudspeaker), the wire may also be elsewhere.

In one exemplary alternative embodiment of the type, one of the two connections to the coil can be made using a conventional method (coil wire connected to a separate spring or pad) Can be fabricated using the above-described concept of using a metal foil as an electrical conductor.

An exemplary method includes providing a magnet system comprising at least one magnet and at least two magnet pieces connected to at least one magnet and providing at least one electrical lead to at least one magnetic pole piece of the magnetic pole piece And at least two pole pieces of the pole piece are electrically isolated from one another so that the at least one pole piece provides at least one separate electrical conductor for the at least one electrical lead of the electromagnetic coil. The step of connecting at least one electrical lead comprises the steps of directly connecting the first end of the wire forming the coil to the first pole piece of the pole piece and connecting the second opposite end of the wire forming the coil to the second pole piece of the pole piece And directly connecting to the stimulation piece.

It should be understood that the foregoing description is illustrative only. Various alternatives or modifications may be devised by those skilled in the art. For example, the features listed in the various dependent claims can be combined with each other in any suitable combination. Further, the features of the various embodiments described above may be selectively combined into a new embodiment. Accordingly, the description is intended to cover all such alternatives, modifications, and variations that fall within the scope of the appended claims.

Claims (31)

CLAIMS 1. A method for manufacturing an acoustic-
Providing a magnet system comprising at least one magnet and at least two pole pieces connected to the at least one magnet,
Connecting at least one electrical lead to at least one pole piece of the pole piece from a coil,
Wherein at least two pole pieces are electrically isolated from each other such that at least one of the at least two pole pieces provides at least one electrical conductor for the at least one electrical lead of the coil
A method of manufacturing a sound generator. The method according to claim 1,
Wherein the at least one electrical lead comprises an opposite end of an electrical wire forming the coil
A method of manufacturing a sound generator. The method according to claim 1,
Wherein the at least one electrical lead comprises a conductor connecting the opposing electrical end of the electrical wire forming the coil to the magnet system
A method of manufacturing a sound generating device. 4. The method according to any one of claims 1 to 3,
Wherein the at least one magnet is a permanent magnet and at least one of the pole pieces is connected to a non-different pole of at least one permanent magnet
A method of manufacturing a sound generator. 5. The method of claim 4,
Wherein the at least one permanent magnet comprises a single permanent magnet
A method of manufacturing a sound generating device. 5. The method of claim 4,
Wherein the at least one permanent magnet comprises a first permanent magnet assembled with a first pole piece of the at least two pole pieces as a first magnet subassembly and a second permanent magnet, And a second permanent magnet assembled with the first permanent magnet,
Wherein the first and second magnet subassemblies are connected to each other to form the magnet system
A method of manufacturing a sound generating device. 4. The method according to any one of claims 1 to 3,
The method further comprises providing an electrical insulating material between the at least two magnetic pole pieces, wherein the electrically insulating material is electrically nonconducting and has a high permeability
A method of manufacturing a sound generator. 4. The method according to any one of claims 1 to 3,
Wherein the at least two pole pieces each include an electrical contact area adapted to electrically connect the magnet system to another member
A method of manufacturing a sound generator. 4. The method according to any one of claims 1 to 3,
The method further comprises mechanically connecting a diaphragm to the coil
A method of manufacturing a sound generator. 4. The method according to any one of claims 1 to 3,
The method comprises:
Providing a printed wiring board in the electronic device,
And electrically connecting the at least two pole pieces to a contact pad of the printed wiring board
A method of manufacturing a sound generator. 4. The method according to any one of claims 1 to 3,
Means for electrically connecting said coil to another member is provided on at least one pole piece of said magnet system
A method of manufacturing a sound generator. 4. The method according to any one of claims 1 to 3,
The method further includes providing an electrical insulator that at least partially electrically insulates the at least two pole pieces from each other
A method of manufacturing a sound generator. 13. The method of claim 12,
Wherein the electrical insulator at least partially electrically insulates at least one pole piece of the at least two pole pieces from the at least one magnet
A method of manufacturing a sound generator. 4. The method according to any one of claims 1 to 3,
Wherein the at least one magnet is comprised of an electrically non-conductive material, and at least one of the at least two magnetic pole pieces comprises an electrically conductive material connected to the at least one magnet
A method of manufacturing a sound generating device. As the sound generating device,
A coil including electrical leads,
A magnet system forming at least one electrical conductor connected to at least one electrical lead of the electrical leads of the coil,
The magnet system is configured to provide an electrical interface,
Said magnet system comprising a first magnetic pole piece and a second magnetic pole piece,
The first magnetic pole pieces and the second magnetic pole pieces are electrically isolated from each other,
Wherein the first magnetic pole piece and the second magnetic pole piece are configured to electrically connect the electrical leads of the coil to another member
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