A centering support piece and a sound generating device

Abstract

The present invention discloses a centering support and a sound-generating device. The centering support comprises a first connecting portion, a planar elastic portion and a second connecting portion. One side of the first connecting portion is configured to be connected with a voice coil of a sound-generating device. The end of the first connecting portion is bent in an S shape toward the other side to extend to form the planar elastic portion. The planar elastic portion and the first connecting portion are in the same plane. The second connecting portion is connected to an end of the planar elastic portion away from the first connecting portion. The second connecting portion is configured to be fixedly connected in the sound-generating device. The centering support is a linear structure formed by winding as one piece.

Description

Technical Field

[0001] The present invention relates to the technical field of electroacoustic conversion, and more specifically, to a centering support and a sound-generating device. Background Art

[0002] With the rapid development of science and technology, the popularity of audio equipment is increasing. People's requirements for audio equipment are not limited to audio playback, but more requirements are put forward for the reliability of audio equipment. In audio equipment, the sound device is a commonly used electronic component, which is mainly used for the playback of audio signals. Its reliability directly affects the function of audio equipment with a sound device.

[0003] The centering support is one of the basic components of the sound-generating device. Its main function is to ensure the correct position of the voice coil in the magnetic gap, to keep the vibration system only reciprocating along the axial direction when the voice coil is subjected to force, and to provide elastic force for the vibration system to reciprocate. The centering support in the prior art rises and falls in a wave-like shape in the axial direction, and is mostly made of fiber material. The centering support with this structure and material not only occupies a large space in the height direction of the sound-generating device, but also, due to the limitation of the material, it is difficult to make the Kms (mechanical stiffness) of the centering support very small. When the vibration displacement of the sound-generating device is large, the compliance provided by the centering support becomes worse, and it is difficult to reduce the F0 of the monomer. In addition, the existing centering support is easy to deform in a high temperature and high humidity environment, its hardness changes, and its fatigue resistance is relatively poor.

[0004] In view of this, it is necessary to provide a new technical solution to solve the above technical problems. Summary of the invention

[0005] An object of the present invention is to provide a new technical solution for a centering support and a sounding device.

[0006] According to one aspect of the present invention, there is provided a centering support, the centering support comprising:

[0007] A first connection portion, one side of which is configured to be connected to a voice coil of a sound-generating device;

[0008] A planar elastic portion, wherein the end of the first connecting portion is bent in an S-shape toward the other side to extend to form the planar elastic portion, and the planar elastic portion and the first connecting portion are in the same plane;

[0009] A second connection portion, the second connection portion is connected to an end of the planar elastic portion away from the first connection portion, and the second connection portion is configured to be fixedly connected in the sound-generating device;

[0010] The centering support piece is a linear structure formed by winding in one piece.

[0011] Optionally, the first connecting portion, the planar elastic portion and the second connecting portion are all made of metal.

[0012] Optionally, the metal material is any one of phosphor bronze, iron, steel or alloy material.

[0013] Optionally, the planar elastic portion is provided as one, and one end of the first connecting portion is bent and extended in an S-shape to form the planar elastic portion.

[0014] Optionally, two planar elastic portions are provided, and both ends of the first connecting portion are bent and extended in an S-shape to form two planar elastic portions respectively.

[0015] Optionally, the first connecting portion is arc-shaped between the two planar elastic portions.

[0016] Optionally, the first connecting portion is in a broken line shape between the two planar elastic portions.

[0017] Optionally, one end of the planar elastic portion away from the first connecting portion is bent into a hook structure to form a second connecting portion.

[0018] Optionally, the second connecting portion includes a circle of hook structures; or, the second connecting portion includes at least two circles of hook structures, and the orthographic projections of the at least two circles of hook structures in the vertical direction overlap.

[0019] Optionally, the width of the planar elastic portion gradually increases from the first connection portion to the second connection portion, and extension lines of two side edges of the planar elastic portion in the width direction intersect at a point in the direction of the first connection portion away from the second connection portion to form an acute angle.

[0020] Optionally, the acute angle is not less than 10°.

[0021] According to another aspect of the present invention, there is provided a sound generating device, comprising:

[0022] A vibration system, the vibration system comprising a diaphragm, a voice coil, a voice coil frame and the centering support as described above, which are combined together;

[0023] A magnetic circuit system, the magnetic circuit system having a magnetic gap, the voice coil being suspended in the magnetic gap;

[0024] a housing configured to accommodate the vibration system and the magnetic circuit system;

[0025] The voice coil is wound on the voice coil frame, the diaphragm is connected to one end of the voice coil frame, the first connecting portion of the centering support is connected to the outer wall of the voice coil frame or the root area of ​​the voice coil, and the second connecting portion of the centering support is fixed to the shell.

[0026] One technical effect of the present invention is that by setting the centering support plate as a planar structure and being made of metal material, the internal and external conduction of the circuit can be achieved simultaneously when it is used, so that there is no need for a separate brocade wire outlet in the prior art, and a lot of space can be saved for the sound-generating device in the vertical direction, which is conducive to making the sound-generating device thinner; and the centering support plate of the present invention can be formed by winding with a metal material, and compared with the fiber and other materials in the prior art, the Kms of the centering support plate can be made smaller, so that it can provide better compliance under large displacement vibration and reduce the F0 of the sound-generating device; in addition, the centering support plate of the present invention is less affected by the high temperature and high humidity environment and has excellent fatigue resistance.

[0027] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0029] Figure 1 The main structure diagram of a centering support piece of the present invention is shown in FIG. Figure 1 ;

[0030] Figure 2 The main structure diagram of a centering support piece of the present invention is shown in FIG. Figure 2 ;

[0031] Figure 3 for Figure 2 Side view of

[0032] Figure 4 The main structure diagram of a centering support piece of the present invention is shown in FIG. Figure 3 ;

[0033] Figure 5 for Figure 4 Side view of

[0034] Figure 6 The mechanical stiffness Kms value curve diagram corresponding to different acute angles α;

[0035] Figure 7 Impedance curve diagrams when a sound-generating device is installed with an existing centering support and an impedance curve diagram when the centering support of the present invention is installed;

[0036] Figure 8 The distortion curve diagram is when the existing centering support piece is installed in the sound-generating device and the centering support piece of the present invention is installed. DETAILED DESCRIPTION

[0037] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0038] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0039] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0040] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0041] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0042] refer to Figure 1-Figure 5 As shown, an embodiment of the present invention provides a centering support plate, which includes a first connecting portion 1, a planar elastic portion 2 and a second connecting portion 3, one side of the first connecting portion 1 is configured to be connected to the voice coil of a sound-emitting device; the end of the first connecting portion 1 is bent in an S shape toward the other side to extend to form the planar elastic portion 2, and the planar elastic portion 2 and the first connecting portion 1 are in the same plane; the second connecting portion 3 is connected to one end of the planar elastic portion 2 away from the first connecting portion 1, and the second connecting portion 3 is configured to be fixedly connected in the sound-emitting device; the centering support plate is a linear structure formed by winding as one body.

[0043] The centering support plate in the prior art is an annular structure as a whole, which rises and falls in the axial direction to form a wave pattern, and the centering support plate in the prior art is generally installed between the magnetic circuit system and the diaphragm of the sound-emitting device, and is usually connected to the outer wall of the voice coil frame. The centering support plate needs to occupy a certain space in the axial direction when vibrating. Due to this limitation, it is difficult to make the height of the sound-emitting device very small. The embodiment of the present invention designs a new centering support plate, whose planar elastic portion 2 and the first connecting portion 1 are located in the same plane. The centering support plate of the present invention is installed on the sound-emitting device. The position occupied by the centering support plate in the height direction of the sound-emitting device is relatively small, which can save a lot of space for the sound-emitting device and is conducive to making the sound-emitting device more compact. Furthermore, the centering support plate in the embodiment of the present invention is a linear structure formed by integral winding. This molding method is easy to operate in terms of process and easy to produce and process.

[0044] In one embodiment, the first connection part 1, the planar elastic part 2 and the second connection part 3 are all made of metal. In one embodiment, the metal material is any one of phosphor bronze, iron, steel or alloy.

[0045] The material of the centering support in the prior art is generally fiber material, such as conex (meta-aramid), blended, and cloth. The centering support made in this way has poor compliance when the sound-generating device undergoes large displacement vibration, and is easily deformed in a high temperature and high humidity environment, and the hardness is easily changed, and the fatigue resistance is poor; the centering support of the present invention is made of metal. On the one hand, it can provide better compliance under large displacement vibration, and is less affected by the high temperature and high humidity environment, and has excellent fatigue resistance. On the other hand, since the centering support is made of metal, it can realize the function of conductivity, and the conduction of the internal and external circuits can be achieved with the help of the centering support structure itself, so that there is no need to set up a separate silk thread, and the space reserved for the silk thread in the vertical direction is saved, which is conducive to making the sound-generating device thinner. After experimental verification, the metal material of the centering support can be selected from phosphor bronze, iron wire, steel wire, and alloy wire. Of course, these materials are only optional materials verified by technicians with the help of limited experiments, but they are not used to limit the present invention.

[0046] refer to Figure 1 As shown, in one embodiment, the planar elastic portion 2 is provided as one, and one end of the first connecting portion 1 is bent in an S shape to extend to form the planar elastic portion 2. In this embodiment, the length of the first connecting portion 1 is substantially consistent with the minimum width of the planar elastic portion 2, and the size of the entire centering support piece is relatively small.

[0047] refer to Figure 2 and Figure 4 As shown, in another embodiment, the planar elastic portion 2 is provided in two, and both ends of the first connecting portion 1 are bent and extended in an S shape to respectively form two planar elastic portions 2. In this embodiment, the length of the first connecting portion 1 is relatively long, and the two planar elastic portions 2 are symmetrically distributed at the two ends of the first connecting portion 1.

[0048] In one embodiment, reference Figure 2 and Figure 3 As shown, the first connection part 1 is arc-shaped between the two planar elastic parts 2. In addition, a convex structure is formed in the middle of the first connection part 1 to enhance the stability of the connection between the centering support and the voice coil of the sound-generating device.

[0049] In one embodiment, reference Figure 4 and Figure 5As shown, the first connection part 1 is in a broken line shape between the two planar elastic parts 2. In addition, a convex structure is formed in the middle of the first connection part 1 to enhance the stability of the connection between the centering support and the voice coil of the sound-generating device.

[0050] In one embodiment, one end of the planar elastic portion 2 away from the first connecting portion 1 is bent into a hook structure to form the second connecting portion 3 .

[0051] In one embodiment, the second connection part 3 includes a circle of hook structure; or, the second connection part 3 includes at least two circles of hook structure, and the vertical projections of at least two circles of hook structure overlap. When a circle of hook structure is provided, the second connection part 3, the first connection part 1 and the planar elastic part 2 are all located in the same plane as a whole, that is, the centering support piece is a completely planar structure, which can ensure the flatness of the product. The second connection part 3 of the hook structure is used to be fixed together with the sound-generating device, and increasing the number of bending circles of the hook structure is conducive to fixing the second connection part 3 and the sound-generating device more firmly.

[0052] In one embodiment, reference Figure 4 As shown, the width of the planar elastic portion 2 gradually increases from the first connection portion 1 to the second connection portion 3, and the extension lines of the two sides of the width direction of the planar elastic portion 2 intersect at a point in the direction of the first connection portion 1 away from the second connection portion 3 to form an acute angle. In one embodiment, the angle of the acute angle is not less than 10°. After testing, it was found that the angle value of the acute angle α has a very obvious effect on the mechanical stiffness of the centering support plate, refer to Figure 6 As shown, when other parameters are the same, the larger the acute angle α is, the lower the mechanical stiffness Kms is, and the better the linear performance of the centering support is. Specific test data can be found in Table 1 below:

[0053] Table 1

[0054] The value of the acute angle α kms(N / mm) Change%@2mm 15° 1.02 23.5％ 25° 0.565 7％ 35° 0.325 2％

[0055] It can be seen from Table 1 that when the angle value of the acute angle α is 15°, the mechanical stiffness Kms value of the centering support is 1.02N / mm, and the elastic force change of the planar elastic portion 2 of the centering support is 23.5% when the elastic deformation of 2mm occurs; when the angle value of the acute angle α is 25°, the mechanical stiffness Kms value of the centering support is 0.565N / mm, and the elastic force change of the planar elastic portion 2 of the centering support is 7% when the elastic deformation of 2mm occurs; when the angle value of the acute angle α is 35°, the mechanical stiffness Kms value of the centering support is 0.325N / mm, and the elastic force change of the planar elastic portion 2 of the centering support is 2% when the elastic deformation of 2mm occurs.

[0056] An embodiment of the present invention further provides a sound-generating device, which includes a vibration system, a magnetic circuit system and a housing, wherein the vibration system includes a diaphragm, a voice coil, a voice coil frame and the centering support plate as described above, which are combined together; the magnetic circuit system has a magnetic gap, and the voice coil is suspended in the magnetic gap; the housing is configured to accommodate the vibration system and the magnetic circuit system; the voice coil is wound on the voice coil frame, the diaphragm is connected to one end of the voice coil frame, the first connecting portion 1 of the centering support plate is connected to the outer wall of the voice coil frame or the root area of ​​the voice coil, and the second connecting portion 3 of the centering support plate is fixed to the housing.

[0057] When the planar elastic portion 2 of the centering support is set to one, the number of the centering support plates set in the sound-emitting device is four in total, that is, there are four planar elastic portions 2 in the sound-emitting device, and the four centering support plates are symmetrically distributed relative to the center of the voice coil. In this embodiment, the centering support plate can be selected to be installed in the root area of ​​the voice coil.

[0058] When the planar elastic parts 2 of the centering support are two, the number of the centering support provided in the sound-generating device is two, that is, a two-piece centering support is used, each of which may include two planar elastic parts 2, but the first connecting part 1 is a common one, and the two centering supports are symmetrically distributed relative to the center of the voice coil. In this embodiment, the centering support can be installed on the outer side wall of the voice coil frame. Of course, no matter which form of the centering support is used, in theory, it is feasible to install it on the outer side wall of the voice coil frame or in the root area of ​​the voice coil.

[0059] In recent years, the development trend of sound-generating devices such as speaker units is to reduce the volume, increase sensitivity and reduce the resonant frequency F0; in order to obtain a lower resonant frequency F0, the centering support in the sound-generating device needs to provide a smaller mechanical stiffness kms, or provide a larger vibration mass Mms, but while increasing the vibration mass, the sensitivity of the sound-generating device will decrease, so reducing the mechanical stiffness kms of the centering support is a more direct and feasible way. However, due to the constraints of the structure and material of the traditional centering support, it is difficult to make the mechanical stiffness kms of the centering support relatively small, and the fatigue resistance will also be reduced, and the centering support is prone to rupture, reducing the service life of the product.

[0060] By using the centering support of the present invention, the mechanical stiffness kms of the centering support can be adjusted by adjusting the shape of the centering support, the wire diameter of the metal wire and other parameters. It has been verified that the centering support of the present invention can achieve a good effect. Figure 7 and Figure 8As shown, in an embodiment verified by the present invention, the centering support kms = 0.56 N / mm, the traditional centering support kms = 0.82 N / mm, the centering support kms symmetry of the present invention is also significantly better than that of the traditional centering support. After the centering support of the present invention is installed, the resonant frequency F0 and the total harmonic distortion THD of the sound-emitting device are significantly reduced.

[0061] like Figure 7 As shown, curve b represents the impedance curve corresponding to when the centering support in the prior art is installed in the sound-emitting device, and curve c represents the impedance curve corresponding to when the centering support according to the embodiment of the present invention is installed in the sound-emitting device. By comparing the curves, it can be seen that the top of the F0 curve of the sound-emitting device in Figure b is around 195 Hz, while the top of the F0 curve of the sound-emitting device in Figure c is around 170 Hz, that is to say, the use of the centering support according to the embodiment of the present invention reduces the resonant frequency F0 of the sound-emitting device.

[0062] like Figure 8 As shown, curves b and c respectively show the distortion curves of applying the centering damper of the prior art and the centering damper of the embodiment of the present invention in the sound-generating device. By comparison, it can be seen that within the same frequency band, the THD value of the centering damper of the embodiment of the present invention is lower than the THD value of the centering damper of the prior art, especially within the frequency band of 100-300 Hz, the centering damper of the embodiment of the present invention has an obvious contribution to reducing THD: at a frequency of 100 Hz, the corresponding THD value in the prior art is less than 16% but greater than 14%, while the THD corresponding to the embodiment of the present invention is less than 10%; at a frequency of 200 Hz, the corresponding THD value in the prior art is less than 5%, about 4%, while the THD corresponding to the embodiment of the present invention is less than 2.5%, about 2%; at a frequency of 300 Hz, the corresponding THD value in the prior art is less than 2.5%, about 2%, while the THD corresponding to the embodiment of the present invention is less than 2%, about 1%. Therefore, it can be seen that both the F0 and THD of the sound-generating device are significantly reduced by using the centering support according to the embodiment of the present invention, thereby optimizing the acoustic performance of the sound-generating device.

[0063] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A centering support, characterized in that: include: A first connection portion, one side of which is configured to be connected to a voice coil of a sound-generating device; A planar elastic portion, wherein the end of the first connecting portion is bent in an S-shape toward the other side to extend to form the planar elastic portion, and the planar elastic portion and the first connecting portion are in the same plane; A second connection portion, the second connection portion is connected to an end of the planar elastic portion away from the first connection portion, and the second connection portion is configured to be fixedly connected in the sound-generating device; The centering support piece is a linear structure formed by winding in one piece; The width of the planar elastic portion gradually increases from the first connection portion to the second connection portion, and the extension lines of the two side edges of the width direction of the planar elastic portion intersect at a point in the direction of the first connection portion away from the second connection portion to form an acute angle; the angle of the acute angle is not less than 10°.

2. The centering support according to claim 1, characterized in that: The first connection portion, the planar elastic portion and the second connection portion are all made of metal.

3. The centering support according to claim 2, characterized in that: The metal material is any one of phosphor bronze, iron, steel or alloy.

4. The centering support according to claim 1, characterized in that: The planar elastic portion is provided as one, and one end of the first connecting portion is bent and extended in an S-shape to form the planar elastic portion.

5. The centering arm according to claim 1, characterized in that: The two planar elastic parts are provided, and both ends of the first connecting part are bent and extended in an S-shape to form the two planar elastic parts respectively.

6. The centering arm according to claim 5, characterized in that: The first connecting portion is arc-shaped between the two planar elastic portions.

7. The centering arm according to claim 5, characterized in that: The first connecting portion is in a broken line shape between the two planar elastic portions.

8. The centering arm according to any one of claims 1 to 7, characterized in that: One end of the planar elastic portion away from the first connecting portion is bent into a hook structure to form a second connecting portion.

9. The centering arm according to claim 8, characterized in that: The second connecting portion includes a circle of hook structures; or, the second connecting portion includes at least two circles of hook structures, and the orthographic projections of the at least two circles of hook structures in the vertical direction overlap.

10. A sound-generating device, characterized in that: It includes: A vibration system, the vibration system comprising a diaphragm, a voice coil, a voice coil frame and a centering support according to any one of claims 1 to 9 that are combined together; A magnetic circuit system, the magnetic circuit system having a magnetic gap, the voice coil being suspended in the magnetic gap; a housing configured to accommodate the vibration system and the magnetic circuit system; The voice coil is wound on the voice coil frame, the diaphragm is connected to one end of the voice coil frame, the first connecting portion of the centering support is connected to the outer wall of the voice coil frame or the root area of ​​the voice coil, and the second connecting portion of the centering support is fixed to the shell.

Images