CN111277934A - Magnetic structure of speakers - Google Patents

Abstract

The invention relates to a magnetic structure of a loudspeaker, which comprises two coil groups, wherein the directions of magnetic fields of the two coil groups are opposite. The two coil groups replace a magnet and a wire coil in the conventional loudspeaker, so that the magnetic structure of the loudspeaker is reduced, and the overall volume of the loudspeaker is further reduced. In addition, the invention adds the magnetic conductive substance into one coil group, the magnetic conductive substance is equivalent to a magnetic conductive column, and the magnetic field generated by the coil group can be effectively concentrated, so that the concentrated magnetic field can have stronger magnetic force, the coil can realize the maximum magnetic field intensity in a narrow space range, and the performance of the loudspeaker is improved.

Description

Magnetic structure of speakers

technical field

The invention relates to the field of loudspeakers, in particular to a magnetic structure of a loudspeaker.

Background technique

Speaker is an important acoustic component in electronic equipment, and is a transducer device that converts electrical signals into acoustic signals.

The current speaker structure generally includes a magnet, a wire coil and a diaphragm connected to the wire coil. The coil is energized to generate a magnetic field, so that the force of the coil in the magnetic field of the magnet changes. The force received will also change, resulting in vibration, and at the same time the diaphragm connected to the coil also vibrates, thereby producing sound and completing the conversion of electrical signals to acoustic signals.

In the current loudspeaker structure, the magnet and the conductive coil form the magnetic structure, which occupies a large space, making the loudspeaker structure larger, making it suitable for use in handheld electronic devices and ultra-thin electronic devices subject to certain restrictions. Therefore, how to provide a miniaturized speaker structure to meet the requirements of ultra-thinness or miniaturization of the electronic device to which it is applied has become an urgent problem to be solved.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a magnetic structure of a loudspeaker, the magnetic structure is small in size and can realize miniaturization of the loudspeaker.

For achieving the above object, the technical scheme adopted in the present invention is:

A magnetic structure of a loudspeaker, which includes two coil sets manufactured by semiconductor technology, micro-electromechanical technology or circuit board technology, the two coil sets are a first coil set and a second coil set, the first coil set and the second coil set The magnetic fields of the groups are in opposite directions.

At least one of the coil sets is provided with a magnetic conductive material.

The coil diameters of the two coil groups are the same, and there is a gap between the lower end surface of the first coil group and the upper end surface of the second coil group.

The coil diameters of the two coil groups are different, and the second coil group is provided with a magnetic conductive material, and the upper end of the magnetic conductive material extends into the first coil group.

The coil group part with the smaller coil diameter is contained in the coil group with the larger coil diameter.

The coil group is composed of at least one coil layer, and when the coil group is composed of more than two coil layers, the coil current directions of the two or more coil layers are the same or opposite;

When the coil current directions of two or more coil layers are opposite, the number of coil layers in the two current directions is not equal.

The coil layer includes at least one coil, and when the coil layer includes more than two coils, the two or more coils are connected in series and/or in parallel.

An insulating layer is arranged between two adjacent coil layers of the coil assembly.

The insulating layer is provided with an escape hole; the magnetic conductive substance is arranged in the escape hole.

The coil layers of the coil set are connected in series or in parallel.

When the coil sets are connected in series, the winding directions of two adjacent coils are opposite.

The coil layer is provided with a first connection end and a second connection end;

The first connection end of the first coil layer of the coil group is connected to the external power supply, and the first connection end or the second connection end of the last coil layer is connected to the external power supply; the first connection ends of the other odd-numbered coil layers are connected to the external power supply. The first connection end of the upper coil layer is connected, the second connection end is connected to the second connection end of the next coil layer; the second connection end of the double coil layer is connected to the second connection end of the upper coil layer, the first connection end The connection end is connected to the first connection end of the next coil layer;

Alternatively, the second connection end of the first coil layer of the coil group is used as one of the connection ends of the coil group to be connected to the external power supply, and the first connection end or the second connection end of the last coil layer is used as the other connection end of the coil group. One connection end is connected to the external power supply; the second connection end of the odd-numbered coil layers in the remaining coil layers is connected to the second connection end of the previous coil layer, and the first connection end is connected to the first connection end of the next coil layer; The first connection end of the number coil layer is connected to the first connection end of the previous coil layer, and the second connection end is connected to the second connection end of the next coil layer.

When the coil groups are connected in parallel, the coils of each coil layer are wound in the same direction; the first connection ends of all coil layers are commonly connected to the positive or negative poles of the external power supply, and the second connection ends of all coil layers are commonly connected to the negative or positive poles of the external power supply .

After adopting the above solution, the magnets and wire coils in the existing speaker are replaced by two coil sets to reduce the volume of the magnetic structure of the speaker, thereby reducing the overall volume of the speaker and realizing the miniaturization of the speaker. In addition, in the present invention, a magnetic permeable material is arranged on at least one coil group, and the magnetic permeable material is equivalent to a magnetic permeable column, which can effectively combine the magnetic field generated by the coil group, so that the combined magnetic field can have a stronger magnetic field. The magnetic force enables the coil to maximize the magnetic field strength in a narrow space, thereby improving the performance of the speaker on the basis of the miniaturization of the speaker volume.

In addition, the coil group of the present invention is etched by semiconductor technology, so that the coil group can be composed of multiple coil layers in a very small space, thereby greatly increasing the number of turns of the coil group, and further realizing the limited and maximum space in a small space. The strength of the magnetizing magnetic field further improves the performance of the magnetic diaphragm and makes the planarized loudspeaker more feasible.

Description of drawings

1 is a schematic structural diagram of a loudspeaker comprising a magnetic structure of the present invention;

2 is a schematic structural diagram of the first embodiment of the present invention;

3 is a schematic structural diagram of a second embodiment of the present invention;

4 is a schematic structural diagram of a third embodiment of the present invention;

5 is a schematic diagram of the combined structure of the coil set of the present invention;

6 is a schematic diagram of an exploded structure of the coil assembly of the present invention;

7 is a schematic structural diagram of each coil layer of the coil group of the present invention when they are connected in parallel;

8 is a schematic structural diagram of the first embodiment when each coil layer of the coil assembly of the present invention is connected in series;

9 is a schematic structural diagram of the second embodiment of the present invention when each coil layer of the coil group is connected in series;

FIG. 10 is Embodiment 1 of the coil layer of the present invention;

FIG. 11 is Embodiment 2 of the coil layer of the present invention;

FIG. 12 is Embodiment 3 of the coil layer of the present invention;

FIG. 13 is Embodiment 4 of the coil layer of the present invention.

Detailed ways

The present invention discloses a magnetic structure of a loudspeaker, which includes two coil sets 10 , the magnetic fields of the two coil sets 10 are opposite in direction, and at least one coil set 10 is provided with a magnetic conductive material 20 .

In the present invention, the magnets and wire coils in the existing loudspeaker are replaced by the two coil sets 10 to reduce the volume of the magnetic structure of the loudspeaker, thereby reducing the overall volume of the loudspeaker. At the same time, in the present invention, at least one coil assembly 10 is provided with a magnetically permeable material 20, the quality of the magnetically permeable material 20 is equivalent to a magnetically conductive column, which can effectively integrate the magnetic field generated by the coil assembly 10, so that the collected and concentrated magnetic field can be With stronger magnetic force, the coil group can maximize the magnetic field strength in a narrow space, thereby improving the performance of the speaker on the basis of the miniaturization of the speaker volume.

As shown in FIG. 1 , the speaker structure includes a casing 30 and a diaphragm 40 connected to the casing 30 , and the magnetic structure of the present invention is located in the casing 30 , and one of the coil sets 10 is connected to the diaphragm 40 , and the other is connected to the diaphragm 40 . The coil assembly 10 is connected to the housing 30 . Wherein, the diaphragm is the part used to vibrate to make the speaker sound, which can be a part of the casing.

Among the above coil assemblies, the coil assembly 10 connected to the diaphragm 40 is the first coil assembly 11 , and the coil assembly 10 connected to the housing 30 is the second coil assembly 12 .

The coil diameter of the first coil group 11 and the coil diameter of the second coil group 12 may be the same or different. As shown in FIG. 2 , the coil diameters of the first coil group 11 and the second coil group 12 are the same. In order to improve the magnetic field strength of the magnetic structure and improve the quality of the speaker, the first coil group 11 and the second coil group 12 are provided with magnetic substances 20. The magnetic substance 30 of the coil assembly 12 is provided on the casing 30 . After the two coil assemblies 10 are energized, under the action of the magnetic fields of the two coil assemblies 10, the diaphragm 40 will vibrate, and the first coil assembly 11 will also vibrate accordingly. When the vibration amplitude of the diaphragm 40 is relatively large, the first coil group 11 and the second coil group 12 will collide, which will seriously affect the performance of the speaker in the long run. To avoid this, there is a certain distance between the first coil group 11 and the second coil group 12 , that is, there is a distance between the lower end surface of the first coil group 11 and the upper end surface of the second coil group 12 .

When the coil diameters of the first coil group 11 and the second coil group 12 are different, the coil diameter of the first coil group 11 may be larger, or the coil diameter of the second coil group 12 may be larger. In the embodiment shown in FIG. 3 , the coil diameter of the first coil group 11 is larger than the coil diameter of the second coil group 12 , and the upper part of the second coil group 12 is included in the first coil group 11 . In this FIG. 3 , the magnetic substance 20 is disposed on the casing 30 at the middle position of the second coil group 12 , and its upper end extends into the first coil group 11 . Compared with the embodiment of FIG. 2 , the diameters of the coils of the two coil sets 10 are different, so the two coil sets 10 can be partially contained, thereby further reducing the volume of the speaker. Moreover, the magnetic conductive material 20 is arranged on the casing 30 and extends into the first coil group 11 , so that the first coil group 11 and the second coil group 12 can share the same magnetic conductive material 20 , and it is avoided to set the conductive material 20 on the diaphragm 40 . The magnetic material 20 reduces the burden on the diaphragm 40. Under the same conditions, the diaphragm 40 has a larger amplitude and better performance of the speaker.

Of course, as shown in FIG. 4 , the coil diameter of the first coil group 11 can also be set to be smaller than the coil diameter of the second coil group 12 , which can also further reduce the volume of the speaker.

The structures of the first coil group 11 and the second coil group 12 are the same, and both are the coil group 10 . In order to make the content of the present invention more detailed, the structure of the coil assembly 10 will be described in detail below.

According to Maxwell's magnetic equation:

After simplification, B=μ ₀ μ _r ni, where μ ₀ is the vacuum permeability, μ _r is the metal permeability, n is the number of coils, and i is the current. It can be seen that the magnitude of the magnetic field generated by the magnetic structure is related to the number of coils in the coil assembly 10 , and when the number of coil turns increases, the magnetic field generated by the magnetic structure increases.

As shown in FIGS. 5 and 6 , in order to maximize the number of coil turns of the coil assembly 10 , the above-mentioned coil assembly 10 is manufactured by using semiconductor technology, MEMS technology or circuit board technology. The coil assembly 10 is composed of at least one coil layer 101 , and each coil layer 101 is provided with a first connection end 1011 and a second connection end 1012 . When the coil assembly 10 is composed of a coil layer 101, the first connection end 1011 and the second connection end 1012 of the coil layer 101 are respectively connected to external power sources.

When the coil assembly 10 is composed of more than two coil layers 101, the coil current directions of the two or more coil layers 101 are the same or opposite; an insulating layer 102 is provided between two adjacent coil layers 101, and the insulating layer 102 is provided with a The escape hole 1021 for accommodating the magnetic conductive substance 20 is accommodated.

When the coil current directions of two or more coil layers are opposite, the number of coil layers in the two current directions is not equal. But make sure that the magnetic fields of the first coil group and the second coil group are in opposite directions. For example, when both the first coil group and the second coil group contain coil layers with opposite current directions, if the first coil layer contains a large number of clockwise coil layers, then the second coil layer needs to contain A greater number of layers of coils in a counter-clockwise direction.

When the coil current directions of the two or more coil layers are the same, the two or more coil layers 101 may be connected in parallel or connected in series; some of the coil layers 101 may be connected in series, and some of the coil layers 101 may be connected in parallel.

As shown in FIG. 7 , when two or more coil layers 101 are connected in parallel, the coil winding directions of all coil layers 101 of the coil group 10 are the same, and the first connection ends 1011 of all coil layers 101 are commonly connected to the positive or negative electrodes of the external power supply. , the second connection terminals 1012 of all coil layers 101 are commonly connected to the negative or positive pole of the external power supply.

As shown in FIG. 8 and FIG. 9 , when more than two coil layers 101 are connected in series, the winding directions of the cavities of two adjacent coil layers are opposite. Specifically, when the first connection end 1011 of the first coil layer 101 of the coil assembly 10 is connected to the external power source, the first connection end 1011 or the second connection end 1012 of the last coil layer 101 is connected to the external power source; the rest The first connection end 1011 of the odd-numbered coil layer 101 is connected to the first connection end 1011 of the previous coil layer 101 , and the second connection end 1012 is connected to the second connection end 1012 of the next coil layer 101 ; The two connection ends 1012 are connected to the second connection end 1012 of the upper coil layer 101 , and the first connection end 1011 is connected to the first connection end 1011 of the next coil layer 101 . When the second connection end 1012 of the first coil layer 101 of the coil group is connected to the external power source, the first connection end 1011 or the second connection end 1012 of the last coil layer 101 is connected to the external power source. The second connection terminals 1012 of the odd-numbered coil layers 101 in the remaining coil layers 101 are connected to the second connection terminals 1012 of the previous coil layer 101 , and the first connection terminals 1011 are connected to the first connection terminals 1011 of the next coil layer 101 ; The first connection end 1011 of the number coil layer 101 is connected to the first connection end 1011 of the previous coil layer 101 , and the second connection end 1012 is connected to the second connection end 1012 of the next coil layer 101 .

On the basis of the above, the connection end connecting the first coil layer 101 with the power source can be drawn out to the last coil layer 101 . The two connection ends of the coil assembly 10 connected to the external power source are located on the same side, which facilitates the subsequent power connection.

Because the coil assembly is manufactured by semiconductor technology, micro-electromechanical technology or circuit board technology, the thickness of each coil layer 101 of the coil assembly 10 is about 90 nm. Even if 100 layers of coils are etched, the thickness of the entire coil assembly is only 9 μm. The maximum number of coil turns is set in the space of 1, which realizes the maximization of the coil and improves the magnetic field strength of the magnetic structure. Assuming that the coil assembly is provided with 100 coil layers 101 , and each coil layer 101 is etched with 100 coils, thus, one coil assembly 10 can generate 10,000 coils.

On the basis of the maximization of the coil, the magnetic conductive material 20 located in the coil assembly 10 effectively integrates the magnetic field generated by the coil assembly, so that the collected magnetic field can have a stronger magnetic force. The magnetically permeable material 20 can be made of μ-alloy, permalloy, electric furnace steel or the like.

Each coil layer 101 of the coil assembly 10 shown in FIGS. 10-11 may be composed of a coil, and the coil may be in a concentric spiral shape, a concentric rectangle, or other geometric shapes. As shown in FIG. 12 , each coil layer 101 may also be composed of multiple coils, and the multiple coils may be connected in parallel or in series. The coil layer can be either an air-core coil so as to be filled with magnetic conductive substances, or a solid coil (as shown in Figure 13).

When the loudspeaker is used to transmit high frequencies, the coil layers 101 of the coil assembly 10 may be connected in series, and the coils of each coil layer 101 may also be connected in series. When the loudspeaker is used to transmit bass, the coil layers 101 of the coil assembly 10 may be connected in parallel, and the coils of each coil layer 101 may also be connected in parallel.

The key point of the present invention is to replace the magnets and wire coils in the existing loudspeaker with the two coil sets 10 to reduce the volume of the magnetic structure of the loudspeaker, thereby reducing the overall volume of the loudspeaker. At the same time, in the present invention, at least one coil group 10 is provided with a magnetic conductive material 20, which is equivalent to a magnetic conductive column, which can effectively combine the magnetic field generated by the coil group, so that the combined magnetic field can have a stronger magnetic field. The magnetic force of the coil maximizes the magnetic field strength in a narrow space, thereby improving the performance of the speaker on the basis of the miniaturization of the speaker volume.

In addition, the coil assembly 10 of the present invention is etched by semiconductor technology, so that the coil assembly 10 can be composed of a plurality of coil layers 101 in a very small space, thereby greatly increasing the number of turns of the coil assembly 10 and further realizing the The limited space maximizes the strength of the magnetic field, further improving the performance of the magnetic diaphragm, making flat speakers more feasible.

The above are only the embodiments of the present invention and do not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still belong to the present invention. within the scope of the technical solution.

Claims (13)

1. A magnetic structure of a speaker, characterized in that: the magnetic field direction of the first coil group is opposite to that of the second coil group.

2. The magnetic structure of a loudspeaker according to claim 1, wherein: at least one coil group is provided with a magnetic substance.

3. The magnetic structure of a loudspeaker according to claim 1, wherein: the diameters of the two coil groups are the same, and a distance exists between the lower end face of the first coil group and the upper end face of the second coil group.

4. The magnetic structure of a loudspeaker according to claim 1, wherein: the diameters of the two coil groups are different, the second coil group is provided with a magnetic substance, and the upper end of the magnetic substance extends into the first coil group.

5. The magnetic structure of a loudspeaker according to claim 4, wherein: the coil block portion having a small coil diameter is contained in the coil block having a large coil diameter.

6. The magnetic structure of a loudspeaker according to claim 1 or 2, wherein: the coil group is composed of at least one coil layer, and when the coil group is composed of more than two coil layers, the coil current directions of the more than two coil layers are the same or opposite;

when the coil current directions of more than two coil layers are opposite, the number of the coil layers in the two current directions is not equal.

7. The magnetic structure of a loudspeaker according to claim 6, wherein: the coil layer comprises at least one coil, and when the coil layer comprises more than two coils, the more than two coils are connected in series and/or in parallel.

8. The magnetic structure of a loudspeaker according to claim 6, wherein: an insulating layer is arranged between two adjacent coil layers of the coil assembly.

9. The magnetic structure of a loudspeaker according to claim 8, wherein: the insulating layer is provided with a abdicating hole; the magnetic conductive substance is arranged in the abdicating hole.

10. The magnetic structure of a loudspeaker according to claim 6, wherein: the coil layers of the coil group are connected in series or in parallel.

11. The magnetic structure of a loudspeaker according to claim 10, wherein: when the coil groups are connected in series, the winding directions of two adjacent coils are opposite.

12. The magnetic structure of a loudspeaker according to claim 11, wherein: the coil layer is provided with a first connecting end and a second connecting end;

the first connecting end of the first layer of coil layer of the coil group is connected with an external power supply, and the first connecting end or the second connecting end of the last layer of coil layer is connected with the external power supply; the first connecting ends of the other odd coil layers are connected with the first connecting end of the previous coil layer, and the second connecting ends are connected with the second connecting end of the next coil layer; the second connecting end of the even number of coil layers is connected with the second connecting end of the upper coil layer, and the first connecting end is connected with the first connecting end of the lower coil layer;

or the second connecting end of the first layer coil layer of the coil group is used as one connecting end of the coil group to be connected with an external power supply, and the first connecting end or the second connecting end of the last layer coil layer is used as the other connecting end of the coil group to be connected with the external power supply; the second connecting end of the odd coil layer in the other coil layers is connected with the second connecting end of the previous coil layer, and the first connecting end is connected with the first connecting end of the next coil layer; the first connecting end of the even number coil layer is connected with the first connecting end of the upper coil layer, and the second connecting end of the even number coil layer is connected with the second connecting end of the lower coil layer.

13. The magnetic structure of a loudspeaker according to claim 10, wherein: when the coil groups are connected in parallel, the winding directions of the coils of all the coil layers are the same; the first connecting ends of all the coil layers are connected with the positive pole or the negative pole of an external power supply together, and the second connecting ends of all the coil layers are connected with the negative pole or the positive pole of the external power supply together.

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