CN117544885A

CN117544885A - Speaker assembly, speaker and sound box

Info

Publication number: CN117544885A
Application number: CN202311642763.1A
Authority: CN
Inventors: 陈青山; 余海华; 王日明; 傅健峰
Original assignee: Huizhou Jinshan Electronic Co ltd
Current assignee: Huizhou Jinshan Electronic Co ltd
Priority date: 2023-11-30
Filing date: 2023-11-30
Publication date: 2024-02-09

Abstract

The invention discloses a loudspeaker assembly, a loudspeaker and a sound box. The speaker assembly includes a frame; the voice coil is arranged and fixed on the framework and used for converting the electric signal into mechanical motion; and the auxiliary coil is arranged near the voice coil, is coaxially wound with the voice coil and is mutually coupled, the auxiliary coil and the voice coil are connected to the same signal source, and the signals of the auxiliary coil and the voice coil have phase differences. The invention improves the nonlinearity of the voice coil inductance of the loudspeaker along with the frequency and power change of the input signal, and improves the distortion of the loudspeaker. By using the technical scheme of the invention, for the high-fidelity loudspeaker, the design of the magnetic circuit structure can be greatly simplified while the distortion is reduced, and the cost of complex machining is saved.

Description

Speaker assembly, speaker and sound box

Technical Field

The present invention relates to the field of speaker technologies, and in particular, to a speaker assembly, a speaker, and a speaker box.

Background

Electroacoustic products are devices that convert electrical energy into acoustic energy, also commonly referred to as speakers or horns. The sound box is a terminal of the whole sound system, and the speakers are main components of the sound box, which function to convert audio electric energy into corresponding sound energy and radiate the sound energy to a space, and the speakers are widely used in professional sound. The traditional loudspeaker generally comprises a frame, a magnetic circuit system arranged in the frame, a voice coil movably accommodated in the magnetic circuit system and a vibrating diaphragm arranged on the frame, wherein the voice coil is connected with the vibrating diaphragm to drive the vibrating diaphragm to vibrate, when different electronic energy is transmitted to the voice coil, the voice coil generates energy to interact with the magnetic field of the magnet, the interaction causes the cone to vibrate, and the voice coil of the loudspeaker moves forwards or backwards due to the fact that the electronic energy changes at any time, so that the density degree of air changes to generate sound.

Distortion of a speaker is a difficult problem in speaker design, and it is a phenomenon in which the original form of a signal is changed or distorted during signal processing or transmission. Any unwanted and undesired changes in the signal that occur as it passes through the transmission system. But does not contain noise and intentionally generated waveform variations such as modulation, detection, etc. It is sometimes referred to as the phenomenon in transmission or playback systems that the original waveform cannot be output at the output.

Especially at high power, the rapid increase of distortion severely affects the quality of the speaker. The nonlinearity of the speaker voice coil inductance is a significant cause of speaker distortion. In the current speaker design, there are many methods for improving the nonlinearity of the voice coil inductance, so that the distortion of the speaker can be improved, for example, adding a copper ring or an aluminum ring in the magnetic circuit, or complex processing of magnetic circuit parts, optimizing the magnetic circuit structure design through finite elements, and the like. However, these methods are all passive methods, which have unsatisfactory effects, and the bandwidth of improvement is relatively narrow, and especially at high power, the improvement effect is very limited. Some complex magnetic circuit structure designs also lead to difficulties in processing and substantial increases in cost.

Disclosure of Invention

The invention provides a loudspeaker assembly, which improves the problem of loudspeaker distortion with low cost by adding an auxiliary coil.

In order to solve the technical problems, the technical scheme of the invention is as follows: a speaker assembly, comprising:

a skeleton;

the voice coil is arranged and fixed on the framework and used for converting the electric signal into mechanical motion; and

the auxiliary coil is arranged near the voice coil, is coaxially wound with the voice coil and is mutually coupled, the auxiliary coil and the voice coil are connected to the same signal source, and the signals of the auxiliary coil and the voice coil have phase differences.

Optionally, the auxiliary coil is disposed inside the voice coil.

Optionally, the auxiliary coil is arranged outside the voice coil.

Optionally, the signal input and output end of the voice coil is reversely connected with the signal input and output end of the auxiliary coil, and the auxiliary coil and the voice coil are wound in the same direction; or alternatively

The signal input and output end of the voice coil is connected with the signal input and output end of the auxiliary coil in a positive mode, and the auxiliary coil and the voice coil are wound reversely.

Optionally, an inverter is arranged between the auxiliary coil and the signal source.

Optionally, a filter is arranged on the auxiliary coil.

Optionally, the speaker assembly further includes a T-iron and a magnet, the voice coil is disposed on top of the magnet, and the magnet is sleeved on the T-iron;

the reverse voice coil is located between the magnet and the T-iron.

Optionally, the speaker assembly further includes a top gasket and a basin frame, the top gasket is sleeved on the T-iron, and the basin frame is arranged on the outer side of the top gasket.

The invention also provides a loudspeaker comprising the loudspeaker assembly.

The invention also provides a loudspeaker box comprising the loudspeaker.

The invention has the beneficial effects that: the voice coil is electrified to move in the magnetic field to drive the cone to push air, so that sound waves are generated. The moving voice coil (inductor) cuts magnetic lines in the magnetic field, and can generate reverse electromotive force and magnetic field to bring distortion of the loudspeaker, and the voice coil moves to different positions and different working frequencies, so that the generated reverse electromotive force and distortion are different. Compared with the prior art, in the design scheme of the invention, the added auxiliary coil can be mutually coupled with the voice coil of the loudspeaker, so that the nonlinearity of the inductance of the voice coil along with the position and the frequency is greatly improved, and the distortion of the loudspeaker is reduced. Especially under the condition of high power input, the current of the newly added coupling coil is synchronously increased, so that the nonlinearity of the inductance of the voice coil of the loudspeaker along with the change of input power is improved, and the distortion of the loudspeaker is improved. The auxiliary coil designed by the method can be designed in a targeted way according to the requirement of the working frequency of the product, and the signal fed to the coil can be filtered by a frequency divider, so that the optimal effect is achieved. By using the technology, the design of the magnetic circuit structure can be greatly simplified, and the cost of complex machining is saved.

Drawings

Fig. 1 is a schematic structural diagram of a speaker according to an embodiment of the present invention;

FIG. 2 is a diagram showing the variation of the inductance Le of the voice coil with frequency according to an embodiment of the present invention;

FIG. 3 is a diagram of test data for a speaker template according to an embodiment of the present invention;

FIG. 4 is a color chart of FIG. 2;

fig. 5 is a color chart of fig. 3.

Names or flow names of the corresponding components represented by numbers or letters in the figures: 1. a voice coil; 2. a magnet; 3. an auxiliary coil; 4.T iron; 5. a top gasket; 6. a basin stand.

The drawings are for illustrative purposes only and are not to be construed as limiting the present patent; for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted; the same or similar reference numerals correspond to the same or similar components; the terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limiting the present patent.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Especially at high power, the rapid increase of distortion severely affects the quality of the speaker. The nonlinearity of the speaker voice coil inductance is a significant cause of speaker distortion. In the current speaker design, there are many methods for improving the nonlinearity of the voice coil inductance, so that the distortion of the speaker can be improved, for example, adding a copper ring or an aluminum ring in the magnetic circuit, optimizing the magnetic circuit structure design through finite elements, and the like. However, these methods are all passive methods, which have unsatisfactory effects, and the bandwidth of improvement is relatively narrow, and especially at high power, the improvement effect is very limited. Some complex magnetic circuit structure designs also lead to difficulties in processing and substantial increases in cost.

Example 1:

in order to solve the above-described problems, the present embodiment provides a speaker assembly, which may be seen in fig. 1, including a speaker cone (speaker cone), which is a moving part of a speaker, generating sound by vibration; voice Coil 1 (Voice Coil), which is a Coil connected to the neck of the speaker cone, for converting an electrical signal into mechanical motion; a Suspension (Suspension) for limiting movement of the speaker cone in a fixed direction; a voice coil 1 bobbin (Voice Coil former) which is a structure supporting the voice coil 1 for supporting the voice coil 1; a Terminal (Terminal) for connection to an audio source; magnet 2 (Magnet): for providing a magnetic field that interacts with the current in the voice coil 1 to produce mechanical movement of the speaker cone; and an auxiliary coil 3 provided at the voice coil 1 and wound along the circumference of the voice coil 1, both ends of the auxiliary coil 3 being connected to both ends of the voice coil 1, respectively.

In an embodiment, the auxiliary coil 3 may be disposed inside the voice coil 1, the auxiliary coil 3 may also be disposed outside the voice coil 1, the auxiliary coil 3 may be disposed close to the voice coil 1, and the specific position thereof may also be designed according to the actual situation, which is not limited herein.

In a further description of the present embodiment, the signal in the auxiliary coil 3 of the present embodiment is opposite to the signal in the voice coil 1.

That is, the signal input/output end of the voice coil 1 is reversely connected with the signal input/output end of the auxiliary coil 3, and the auxiliary coil 3 and the voice coil 1 are wound in the same direction; or the signal input and output end of the voice coil 1 is connected with the signal input and output end of the auxiliary coil 3, and the auxiliary coil 3 and the voice coil 1 are wound reversely. The method can be concretely characterized in that:

in an embodiment, two ends of the auxiliary coil 3 are a coil signal input end and a coil signal output end respectively, two ends of the voice coil 1 are a voice coil 1 signal input end and a voice coil 1 signal output end respectively, the auxiliary coil 3 and the voice coil 1 are wound in the same direction, when the auxiliary coil 3 and the voice coil 1 are wound in the same direction, the coil signal input end is connected with the voice coil 1 signal output end, and the coil signal output end is connected with the voice coil 1 signal input end;

in the description of the embodiment, when the auxiliary coil 3 and the voice coil 1 are wound in the same direction, two ends of the auxiliary coil 3 are not directly connected with two ends of the voice coil 1, but the signal input end and the signal output end of the voice coil 1 are connected to the positive electrode of the power supply, and the signal output end and the signal input end of the voice coil 1 are connected to the negative electrode of the power supply;

in an embodiment, two ends of the auxiliary coil 3 are a coil signal input end and a coil signal output end respectively, two ends of the voice coil 1 are a voice coil 1 signal input end and a voice coil 1 signal output end respectively, the auxiliary coil 3 and the voice coil 1 are wound reversely, when the auxiliary coil 3 and the voice coil 1 are wound reversely, the coil signal input end is connected with the voice coil 1 signal input end, and the coil signal output end is connected with the voice coil 1 signal output end;

in the description of the present embodiment, when the auxiliary coil 3 is reversely wound with the voice coil 1, both ends of the auxiliary coil 3 are not directly connected with both ends of the voice coil 1, but the signal input end of the voice coil 1 and the signal input end of the coil are connected to the positive electrode of the power supply, and the signal output end of the voice coil 1 and the signal output end of the coil are connected to the negative electrode of the power supply.

The signal of the auxiliary coil 3 and the signal of the voice coil 1 described in this embodiment have a phase difference, and as one embodiment, the signal of the auxiliary coil 3 and the signal of the voice coil 1 may be in opposite phases; as another embodiment, it may not be anti-phase, but not necessarily in-phase.

In this embodiment, as shown in fig. 2, fig. 2 shows the variation characteristic of the inductance Le of the voice coil 1 with frequency, where x represents the position of the voice coil 1 and is determined by power. The smaller the Le value, the smaller the variation with frequency, the smaller the variation with position, and the smaller the characterization horn distortion. The data were obtained by finite element simulation. As can be seen from fig. 2, the voice coil 1 inductance Le data is optimal when the auxiliary coil 3 is added.

In this example, we produced a horn template based on simulation, and test data is shown in fig. 3. The template is a woofer and the effective range is 30Hz-200Hz. As can be seen from fig. 3, by using the auxiliary coil 3, not only the characteristic of the frequency response curve (SPL) can be improved, but also the distortion (THD) of the horn can be well reduced.

According to fig. 2 and 3, implementation effect data and comparison data of the present embodiment are provided, from which it can be seen that the following effects are achieved by adding the auxiliary coil 3 in the present embodiment:

compared with the prior art, the loudspeaker assembly provided by the embodiment has the advantages that the voice coil is electrified to move in the magnetic field to drive the cone to push air, so that sound waves are generated. The moving voice coil (inductor) cuts magnetic lines in the magnetic field, and can generate reverse electromotive force and magnetic field to bring distortion of the loudspeaker, and the voice coil moves to different positions and different working frequencies, so that the generated reverse electromotive force and distortion are different. Compared with the prior art, in the design scheme of the invention, the added auxiliary coil can be mutually coupled with the voice coil of the loudspeaker, so that the nonlinearity of the inductance of the voice coil along with the position and the frequency is greatly improved, and the distortion of the loudspeaker is reduced. Especially under the condition of high power input, the current of the newly added coupling coil is synchronously increased, so that the nonlinearity of the inductance of the voice coil of the loudspeaker along with the change of input power is improved, and the distortion of the loudspeaker is improved. The auxiliary coil designed by the method can be designed in a targeted way according to the requirement of the working frequency of the product, and the signal fed to the coil can be filtered by a frequency divider, so that the optimal effect is achieved. By using the technology, the design of the magnetic circuit structure can be greatly simplified, and the cost of complex machining is saved.

Example 2:

in this embodiment, a filter is preferably disposed between the auxiliary coil and the signal source, and the filter is a frequency-selecting device, so that a specific frequency component in the signal can pass through, while other frequency components are greatly attenuated, and unwanted frequency components can be filtered out by using the frequency-selecting function of the filter.

In one embodiment, an inverter is provided between the auxiliary coil and the signal source, the inverter causing the signal entering the auxiliary coil to be in opposite phase to the signal of the voice coil.

In an embodiment, the auxiliary coil 3 may be adhered to the top gasket 5 by glue, and the auxiliary coil 3 may be adhered to the inside or outside of the top gasket 5. The auxiliary coil 3 may be fixed by bonding, the auxiliary coil 3 may be placed to be offset, and other fixing methods for the auxiliary coil 3 may be used, which is not limited herein.

In this embodiment, referring to fig. 1 again, the speaker assembly further includes a T-iron 4, a top gasket 5 and a basin frame 6, the voice coil 1 is disposed at the top of the magnet, the magnet and the top gasket 5 are sleeved on the T-iron 4, the basin frame 6 is sleeved on the T-iron 4, and the basin frame 6 is disposed at the outer side of the top gasket 5. The structure of the speaker assembly in this embodiment is a preferential structure, and the specific structure of the speaker assembly can be designed according to actual requirements, which is not limited herein.

Example 3:

the present embodiment provides a speaker, which includes the speaker assemblies described in embodiment 1 and embodiment 2, and also includes other optional components of the speaker, and may be specifically designed according to actual requirements, which are not described in detail herein or are not limited thereto.

Example 4:

the present embodiment provides a sound box, which includes the speaker assemblies described in embodiment 1 and embodiment 2, and further includes a box body, a frequency divider, a sound absorbing material, and other components, and may be specifically designed according to actual requirements, which are not described in detail herein or are not limited thereto.

The same or similar reference numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if any, terms such as "upper," "lower," "left," "right," "top," "bottom," "inner," "outer," and the like indicate an orientation or a positional relationship based on that shown in the drawings, only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus the words describing the positional relationship in the drawings are merely for illustration and not to be construed as limiting the present patent. Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are primarily for distinguishing between different devices, elements, or components (the particular categories and configurations may be the same or different) and are not intended to indicate or imply relative importance or quantity of the devices, elements, or components indicated, but are not to be construed as indicating or implying relative importance.

In the present invention, unless explicitly specified and limited otherwise, the terms "connected," "fixed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims

1. A speaker assembly, characterized by: comprising

A skeleton;

2. A loudspeaker assembly according to claim 1, wherein: the auxiliary coil is arranged on the inner side of the voice coil.

3. A loudspeaker assembly according to claim 1, wherein: the auxiliary coil is arranged outside the voice coil.

4. A loudspeaker assembly according to any one of claims 1-3, wherein:

the signal input and output end of the voice coil is reversely connected with the signal input and output end of the auxiliary coil, and the auxiliary coil and the voice coil are wound in the same direction; or alternatively

5. A loudspeaker assembly according to claim 1, wherein: an inverter is arranged between the auxiliary coil and the signal source.

6. A loudspeaker assembly according to claim 1, wherein: and a filter is arranged on the auxiliary coil.

7. A loudspeaker assembly according to claim 2 or 3, wherein: the loudspeaker assembly further comprises a T iron and a magnet, the voice coil is arranged at the top of the magnet, and the magnet is sleeved on the T iron;

the reverse voice coil is located between the magnet and the T-iron.

8. A loudspeaker assembly according to claim 1, wherein: the loudspeaker assembly further comprises a top gasket and a basin frame, wherein the top gasket is sleeved on the T iron, and the basin frame is arranged on the outer side of the top gasket.

9. A loudspeaker, characterized by: comprising a loudspeaker assembly according to any of claims 1-8.

10. A sound box, characterized in that: comprising the loudspeaker of claim 9.