A skeleton voice coil and an electroacoustic conversion device

Abstract

An embodiment of the present invention provides a skeleton voice coil and an electroacoustic conversion device. By using the skeleton to fix at least two voice coils, the dimensions of the multiple voice coils along the axial direction and their relative positions along the axial direction can be conveniently adjusted. Thus, the multiple voice coils can be arranged at the position with the maximum magnetic flux in the magnetic gap, improving the sensitivity, suppressing the total harmonic distortion, and making the real-time feedback effect of the electroacoustic conversion device using the skeleton voice coil of this embodiment better.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic products, and particularly to a skeleton voice coil and an electroacoustic conversion device. Background Art

[0002] An electroacoustic conversion device is a device that converts electrical energy into sound energy. It includes a chassis and a magnetic assembly connected to each other. Among them, a diaphragm is connected to the chassis, and a voice coil is located inside a housing formed by the chassis and the magnetic assembly. One end of the voice coil is connected to the inner surface of the diaphragm, and the other end of the voice coil forms a free end and is inserted into the magnetic assembly.

[0003] However, the existing electroacoustic conversion devices still need to be improved. Summary of the Invention

[0004] In view of this, embodiments of the present invention provide a skeleton voice coil and an electroacoustic conversion device, which can improve the performance of the electroacoustic conversion device.

[0005] In a first aspect, an embodiment of the present invention provides a skeleton voice coil. The skeleton voice coil according to the embodiment of the present invention includes:

[0006] A skeleton having a cylindrical structure;

[0007] At least two voice coils wound around the outside of the skeleton, and the voice coils are electrically isolated from each other.

[0008] Preferably, the at least two voice coils include a first voice coil and a second voice coil. The first voice coil is wound around a first region of the skeleton, and the second voice coil is wound around a second region of the skeleton. Among them, the first region and the second region have a predetermined distance along the axial direction of the skeleton.

[0009] Preferably, the first voice coil and the second voice coil are respectively electrically connected to different drive circuits.

[0010] Preferably, the first voice coil and the second voice coil are bonded together with glue.

[0011] Preferably, the cross-section of the skeleton is a circular ring, and the cross-section of the voice coil is a circular ring; or

[0012] The cross-section of the skeleton is a square ring, and the cross-section of the voice coil is a square ring.

[0013] In a second aspect, an embodiment of the present invention provides an electroacoustic conversion device. The electroacoustic conversion device includes:

[0014] A magnetic assembly that forms a magnetic gap;

[0015] A diaphragm;

[0016] A chassis; and

[0017] A bobbin voice coil, with a part of the bobbin voice coil disposed in the magnetic gap, and an upper end surface of the bobbin voice coil connected to the diaphragm;

[0018] Wherein, the bobbin voice coil includes:

[0019] A bobbin having a cylindrical structure;

[0020] At least two voice coils wound around the outside of the bobbin, and the voice coils are electrically isolated from each other.

[0021] Preferably, the at least two voice coils include a first voice coil and a second voice coil. The first voice coil is wound around a first region of the bobbin, and the second voice coil is wound around a second region of the bobbin. Wherein, the first region and the second region are spaced apart by a predetermined distance along the axial direction of the bobbin.

[0022] Preferably, the electro-acoustic conversion device further includes a first drive circuit and a second drive circuit;

[0023] The first voice coil and the second voice coil are respectively electrically connected to the first drive circuit and the second drive circuit.

[0024] Preferably, the first voice coil and the second voice coil are bonded together with glue.

[0025] Preferably, the cross-section of the bobbin is a circular ring, and the cross-section of the voice coil is a circular ring; or

[0026] The cross-section of the bobbin is a square ring, and the cross-section of the voice coil is a square ring.

[0027] In the embodiments of the present invention, by using a bobbin to fix at least two voice coils, the axial dimensions of the multiple voice coils and their relative axial positions are conveniently adjustable. Thus, the multiple voice coils can be arranged at the position with the maximum magnetic flux in the magnetic gap, improving the sensitivity, suppressing the total harmonic distortion, and making the real-time feedback effect of the electro-acoustic conversion device using the bobbin voice coil of this embodiment better. Description of the Drawings

[0028] Through the following description of the embodiments of the present invention with reference to the drawings, the above and other objects, features, and advantages of the present invention will become clearer. In the drawings:

[0029] Figure 1 is a cross-sectional view of an electro-acoustic conversion device of a comparative example;

[0030] Figure 2 is a schematic diagram of the bobbin voice coil of the first embodiment of the present invention;

[0031] Figure 3 is a schematic diagram of the bobbin voice coil of the first embodiment of the present invention;

[0032] Figure 4 It is a schematic diagram of the skeleton voice coil of the first embodiment of the present invention;

[0033] Figure 5 It is a sectional view of the electro-acoustic conversion device of the second embodiment of the present invention;

[0034] Figure 6 It is a schematic diagram of the electro-acoustic conversion device of the second embodiment of the present invention.

[0035] Description of reference numerals:

[0036] 1 First voice coil; 2 Second voice coil; 10 Skeleton voice coil; 11 First voice coil; 12 Second voice coil; 13 Skeleton; 20 Basin frame; 30 Diaphragm; 40 Magnetic assembly. Detailed implementation manners

[0037] The following describes the present invention based on embodiments, but the present invention is not limited to these embodiments. In the following detailed description of the present application, some specific details are described in detail. Those skilled in the art can fully understand the present application without the description of these details. In order to avoid obscuring the essence of the present application, well-known methods, processes, procedures, elements, and circuits are not described in detail.

[0038] In addition, those of ordinary skill in the art should understand that the drawings provided herein are for illustrative purposes only, and the drawings are not necessarily drawn to scale.

[0039] Unless the context clearly requires otherwise, the words such as "including" and "comprising" in the specification should be construed in an inclusive sense rather than an exclusive or exhaustive sense; that is, it is the meaning of "including but not limited to".

[0040] In the description of the present application, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In addition, in the description of the application, unless otherwise specified, the meaning of "plurality" is two or more.

[0041] Unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0042] When an element or layer is referred to as being "on," "attached to," "connected to," or "coupled to" another element or layer, it can be directly on, attached, connected, or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly" on, "directly attached to," "directly connected to," or "directly coupled to" another element or layer, no intervening elements or layers may be present. Other words used to describe the relationship between elements should be interpreted in a similar manner. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0043] For ease of description, spatially relative terms such as "inner," "outer," "beneath," "below," "lower," "above," "upper," etc. are used herein to describe the relationship of one element or feature illustrated in the figures to another element or feature. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, an element described as "below" or "beneath" another element or feature would then be oriented "above" that other element or feature. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device may be otherwise oriented, and the spatially relative descriptors used herein should be interpreted accordingly.

[0044] Traditional electroacoustic conversion devices generally have a single voice coil, while dual voice coil electroacoustic conversion devices have 2 voice coils, and the 2 voice coils are respectively matched with different drive circuits to achieve that the 2 voice coils are respectively driven by different drive circuits, so as to achieve the effect of suppressing Total Harmonic Distortion (THD). Figure 1 It is a schematic diagram of an electroacoustic conversion device of a comparative example. As Figure 1 shown, the voice coil of the electroacoustic conversion device is composed of a first voice coil 1 and a second voice coil 2, and the lower surface of the first voice coil 1 is bonded to the upper surface of the second voice coil 2. However, in the comparative example, the bonding strength between the first voice coil 1 and the second voice coil 2 cannot meet the increasing reliability requirements of the product, and the assembly process control is difficult, and the concentricity control of the voice coil 1 and the second voice coil 2 is difficult. Moreover, the relative position of the voice coil and the magnetic gap is limited by the size of the voice coil, and the axial dimensions of the first voice coil 1 and the second voice coil 2, as well as the axial spacing between the first voice coil 1 and the second voice coil 2, cannot be adjusted well.

[0045] In view of this, the embodiments of the present invention provide a skeleton voice coil and an electroacoustic conversion device applying the skeleton voice coil, so as to improve the reliability of the skeleton voice coil, and further improve the sound effect of the electroacoustic conversion device applying the skeleton voice coil.

[0046] The skeleton voice coil 10 is a structure composed of two parts: a skeleton 13 and a voice coil. By means of the skeleton 13, the voice coil and the diaphragm 30 are connected, which can improve the connection stability between the voice coil and the diaphragm 30, reduce the risk of the voice coil lead wire breaking, and improve the reliability of the electro-acoustic conversion device.

[0047] In this embodiment, the electro-acoustic conversion device can be a micro speaker, such as a hands-free phone speaker or a speaker or receiver in a smart phone, or other similar compact electronic devices, such as a laptop computer, a notebook or a tablet computer. The electro-acoustic conversion device can be enclosed in or integrated into the housing or casing of the device where it is located.

[0048] In this embodiment, an electro-acoustic conversion device with a cuboid shape is taken as an example for illustration. It should be understood that the shape of the electro-acoustic conversion device can also be different shapes such as a sphere, a cylinder, a cube and an irregular shape, etc., which are not limited herein and can be freely selected according to the application scenario of the electro-acoustic conversion device.

[0049] Figures 2 - 4 It is a schematic cross-sectional view of the skeleton voice coil 10 of the first embodiment of the present invention. The skeleton voice coil 10 of the first embodiment of the present invention includes: a skeleton 13 and at least two voice coils.

[0050] The skeleton 13 has a cylindrical structure; the skeleton 13 is used to support the voice coil and can be composed of kraft paper, asbestos paper, Nomex, polyimide, aluminum foil, copper foil, glass fiber, etc.

[0051] The voice coils are wound around the outside of the skeleton 13, and the voice coils are electrically isolated from each other.

[0052] Further, the skeleton voice coil 10 includes two voice coils. It includes a first voice coil 11 and a second voice coil 12. The first voice coil 11 is wound around the first region of the skeleton 13, and the second voice coil 12 is wound around the second region of the skeleton 13. Among them, the first region and the second region have a predetermined distance along the axial direction of the skeleton 13. The number of turns of the first voice coil 11 and the second voice coil 12 can be the same or different, and the axial dimensions of the first voice coil 11 and the second voice coil 12 can be the same or different.

[0053] In an optional implementation manner, the cross-section of the skeleton 13 is a circular ring, and the cross-section of the voice coil is a circular ring. Specifically, both the voice coil and the skeleton 13 can be a cylindrical structure or a tubular structure. The cross-section of the voice coil 10 is a cross-section perpendicular to the central axis of the voice coil 10. Among them, the cross-section of the voice coil can be a circular ring, an elliptical ring, a rounded rectangular ring, etc.

[0054] In another optional implementation manner, the cross-section of the skeleton 13 is a square ring, and the cross-section of the voice coil is a square ring.

[0055] In other alternative implementations, the cross-section of the skeleton 13 and the cross-section of the voice coil can also be irregular rings.

[0056] The inner walls of the first voice coil 11 and the second voice coil 12 are adhered to the outer wall of the skeleton 13. Specifically, the first voice coil 11 and the second voice coil 12 can be directly wound around the outer wall of the skeleton 13, and during the winding process, glue is coated on the outer wall of the skeleton 13 to form an adhesive layer between the voice coil and the skeleton 13, so as to form a fixed connection between the first voice coil 11 and the skeleton 13, and between the second voice coil 12 and the skeleton 13. Since the inner wall areas of the first voice coil 11 and the second voice coil 12 are relatively large, in this embodiment, the bonding force between the first voice coil 11 and the skeleton 13, and between the second voice coil 12 and the skeleton 13 is relatively large, and the situation where the first voice coil 1 and the second voice coil 2 in the comparative example cannot form a reliable connection will not occur.

[0057] In other alternative implementations, the first voice coil 11 and the second voice coil 12 can be first wound and formed with alcohol-soluble wire or hot-melt wire, and then the first voice coil 11 and the second voice coil 12 are adhered to the outer wall of the skeleton 13 in sequence, so as to form a fixed connection between the first voice coil 11 and the skeleton 13, and between the second voice coil 12 and the skeleton 13. And glue is provided between the first voice coil 11 and the second voice coil 12, so that the first voice coil 11 and the second voice coil 12 are bonded by the glue, which can further improve the stability of the connection between the first voice coil 11 and the second voice coil 12.

[0058] Further, as Figure 2 shown, the distance between the first region and the second region is 0, that is to say, the end faces of the first voice coil and the second voice coil are in contact with each other.

[0059] Further, as Figure 3 shown, the distance between the first region and the second region is greater than 0, that is to say, the first voice coil and the second voice coil are spaced apart by a certain distance.

[0060] By using the skeleton 13 to fix the first voice coil 11 and the second voice coil 12, the dimensions of the first voice coil 11 and the second voice coil 12 in the axial direction, as well as their relative positions in the axial direction, are convenient to adjust. Thus, the first voice coil 11 and the second voice coil 12 can be arranged at the position where the magnetic flux in the magnetic gap is the largest, improving the sensitivity, suppressing the total harmonic distortion, and making the real-time feedback effect of the electro-acoustic conversion device using the skeleton voice coil 10 of this embodiment better.

[0061] Further, the first region and the second region can also partially overlap. Specifically, the first coil can be first adhered to the first region of the skeleton 13, and then the second coil is partially wound outside the first coil.

[0062] Thus, the height dimension of the skeleton voice coil 10 can be shortened, so that both voice coils are located in the magnetic gap.

[0063] In this embodiment, by using the skeleton to fix the first voice coil and the second voice coil, the dimensions of the first voice coil and the second voice coil along the axial direction, as well as their relative positions along the axial direction, are convenient to adjust.

[0064] Furthermore, as Figure 4 shown, the multiple voice coils include 3 voice coils. The skeleton voice coil 10 includes a skeleton 13 and a first voice coil 11, a second voice coil 12, and a third voice coil 13 that are sequentially wound around the skeleton 13. There is a predetermined distance between the first voice coil 11, the second voice coil 12, and the third voice coil 13. The above-mentioned skeleton voice coil 10 can be applied to an electroacoustic conversion device having three drive circuits.

[0065] Figure 5 is a cross-sectional view of the electroacoustic conversion device according to the second embodiment of the present invention. The electroacoustic conversion device in this embodiment includes: a skeleton voice coil 10, a chassis 20, a diaphragm 30, and a magnetic component 40.

[0066] The shapes and dimensions of the skeleton voice coil 10, the chassis 20, the diaphragm 30, and the magnetic component 40 can be adaptively adjusted according to the shape and dimensions of the electroacoustic conversion device.

[0067] The skeleton voice coil 10 in this embodiment can refer to the skeleton voice coil 10 described in the first embodiment of the present invention, and will not be elaborated here.

[0068] The voice coil in the skeleton voice coil 10 is a coil through which current passes. After receiving a current signal, it vibrates in a magnetic field.

[0069] The chassis 20 is a support component of the electroacoustic conversion device. After integrating the functional components of the electroacoustic conversion device, it can be installed on an electronic device using the electroacoustic conversion device through the chassis 20.

[0070] The magnetic component 40 is fixedly connected to the chassis 20. The magnetic component 40 has an annular gap that matches the shape of the voice coil. A magnetic field is formed in the gap, which is also called a magnetic gap. The magnetic component 40 can be fixedly connected to the bottom plate of the chassis 20.

[0071] The central axis of the skeleton voice coil 10 is basically arranged perpendicular to the bottom surface of the speaker frame 20. The skeleton 13 of the skeleton voice coil 10 is connected to the diaphragm 30. Specifically, the upper end surface of the skeleton 13 is adhesively bonded to the lower surface of the diaphragm 3030. The voice coil of the skeleton voice coil 10 is located in the magnetic gap. When a current-carrying conductor passes through a magnetic field, it will be subjected to an Ampere force, the direction of which conforms to Fleming's left-hand rule. The Ampere force is perpendicular to the current and the magnetic field directions, and the magnitude of the Ampere force is proportional to the current, the length of the wire, and the magnetic induction intensity. When an alternating audio current is input to the voice coil, the voice coil becomes a current-carrying conductor and is subjected to an alternating driving force to generate an alternating motion, driving the diaphragm 30 to vibrate and repeatedly pushing the air to produce sound.

[0072] In an alternative implementation, as Figure 5 and Figure 6 shown, the skeleton voice coil 10 includes a first voice coil 11 and a second voice coil 12, and the electro-acoustic conversion device further includes: a first driving circuit (not shown) and a second driving circuit (not shown).

[0073] The first voice coil 11 and the second voice coil 12 are respectively electrically connected to the first driving circuit and the second driving circuit.

[0074] In the embodiment of the present invention, by using a double voice coil with a skeleton in the electro-acoustic conversion device, the size and position of the voice coil in the vertical direction are convenient to adjust, so that the voice coil is arranged at the position with the maximum magnetic flux in the magnetic gap, improving the sensitivity, and having a better effect of suppressing total harmonic distortion and real-time feedback.

[0075] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A voice coil skeleton (10), characterized in that, The described skeleton voice coil (10) includes: A skeleton (13) having a cylindrical structure; At least two voice coils wound outside the skeleton (13) and electrically isolated from each other. The at least two voice coils include a first voice coil (11) and a second voice coil (12). The first voice coil (11) is wound in a first region of the skeleton (13), and the second voice coil (12) is wound in a second region of the skeleton (13); Wherein, the skeleton (13) facilitates the adjustment of the relative axial positions of the first voice coil (11) and the second voice coil (12). The inner walls of the first voice coil (11) and the second voice coil (12) are bonded to the outer wall of the skeleton (13). The first region and the second region have a predetermined distance along the axis of the skeleton (13). When the value of the predetermined distance is 0, the end face of the first voice coil (11) contacts the end face of the second voice coil (12); when the value of the predetermined distance is less than 0, the first voice coil (11) and the second voice coil (12) partially overlap; when the value of the predetermined distance is greater than 0, there is a gap between the end face of the first voice coil (11) and the end face of the second voice coil (12).

2. The skeleton voice coil (10) according to claim 1, characterized in that, The first voice coil (11) and the second voice coil (12) are respectively electrically connected to different drive circuits.

3. The voice coil skeleton (10) according to claim 1, characterized in that, The first voice coil (11) and the second voice coil (12) are bonded together with glue.

4. The skeleton voice coil (10) according to claim 1, characterized in that, The cross-section of the skeleton (13) is a circular ring, and the cross-section of the voice coil is a circular ring; or The cross-section of the skeleton (13) is a square ring, and the cross-section of the voice coil is a square ring.

5. An electroacoustic conversion device, characterized in that, The electro-acoustic conversion device includes: A magnetic component (40) forming a magnetic gap; A diaphragm (30); A chassis (20); and A skeleton voice coil (10) partially disposed in the magnetic gap, and the upper end face of the skeleton voice coil (10) is connected to the diaphragm (30); Wherein, the skeleton voice coil (10) includes: A skeleton (13) having a cylindrical structure; At least two voice coils wound outside the skeleton (13) and electrically isolated from each other. The at least two voice coils include a first voice coil (11) and a second voice coil (12). The first voice coil (11) is wound in a first region of the skeleton (13), and the second voice coil (12) is wound in a second region of the skeleton (13); Wherein, the skeleton (13) facilitates the adjustment of the relative axial positions of the first voice coil (11) and the second voice coil (12). The inner walls of the first voice coil (11) and the second voice coil (12) are bonded to the outer wall of the skeleton (13). The first region and the second region have a predetermined distance along the axis of the skeleton (13). When the value of the predetermined distance is 0, the end face of the first voice coil (11) contacts the end face of the second voice coil (12); when the value of the predetermined distance is less than 0, the first voice coil (11) and the second voice coil (12) partially overlap; when the value of the predetermined distance is greater than 0, there is a gap between the end face of the first voice coil (11) and the end face of the second voice coil (12).

6. The electroacoustic conversion device according to claim 5, characterized in that, The electroacoustic conversion device further includes a first drive circuit and a second drive circuit; The first voice coil (11) and the second voice coil (12) are electrically connected to the first drive circuit and the second drive circuit respectively.

7. The electroacoustic conversion device according to claim 5, characterized in that, The first voice coil (11) and the second voice coil (12) are adhesively bonded together with glue.

8. The electroacoustic conversion device according to claim 5, characterized in that, The cross-section of the bobbin (13) is a circular ring, and the cross-section of the voice coil is a circular ring; or The cross-section of the bobbin (13) is a square ring, and the cross-section of the voice coil is a square ring.

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