Low-frequency unit filtering structure of multi-unit combined earphone
By adopting a low-frequency unit filtering structure including a housing, a planar diaphragm unit, an acoustic catheter and a breathable hole in the multi-unit hybrid in-ear headphones, combined with a frequency division circuit, the complex structure and production problems of traditional headphones are solved, and high-fidelity audio separation and optimization are achieved.
Patent Information
- Application Number
- CN202421637664.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-10
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-07-10
AI Technical Summary
When traditional multi-unit hybrid in-ear headphones realize low-frequency unit filtering, the structure is complex and easy to cause the rear sound cavity opening to be blocked during glue operation, affecting production.
A low-frequency unit filtering structure including a shell, a planar diaphragm unit, a first acoustic catheter and a second acoustic catheter are adopted. The acoustic cavity in the shell is divided into the front acoustic cavity and the rear acoustic cavity, and is connected to the outside of the catheter by means of a breathable hole, combined with a frequency division circuit, and the separation and optimization of low-frequency and medium-high frequencies are achieved.
The frequency response curves and phase curves of the low-frequency unit and the medium-frequency unit are achieved smoothly and continuity, which improves the sound fidelity, and simplifies the structure, avoids the complexity of opening holes in the rear cavity, and facilitates production and manufacturing.
Smart Images
Figure CN222802998U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of audio, in particular to a low-frequency unit filtering structure of a multi-unit combined earphone. Background Art
[0002] Multi-unit hybrid in-ear headphones refer to in-ear headphones that are made using one or a combination of what are commonly known as ring-iron, ring-static-iron, or static-iron.
[0003] Traditional multi-unit hybrid in-ear headphones usually use a frequency division circuit to cut off the mid-high frequency part of the low-frequency unit and adjust the parameters of the frequency division circuit. Although there is also a structure of setting two sections of sound guide tubes to replace the filter circuit to achieve the corresponding function, one end of one section of the sound guide tube needs to be connected to the rear sound cavity, which is not only relatively complex in structure, but also opens a hole in the rear cavity, which is easy to cause the hole to be blocked during the glue operation, which is not conducive to production. Utility Model Content
[0004] The utility model aims to overcome the deficiencies of the prior art and provide a low-frequency unit filtering structure of a multi-unit combined earphone.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] The utility model provides a low-frequency unit filtering structure of a multi-unit combination earphone, comprising a shell, a planar diaphragm unit, a first sound conduit and a second sound conduit, a sound cavity is provided in the shell, the planar diaphragm unit is installed in the sound cavity, and the sound cavity is divided into a front sound cavity and a rear sound cavity, the rear sound cavity is provided with an air hole so that the rear sound cavity is connected to the outside of the shell, one end of the first sound conduit is connected to the front sound cavity, the front sound cavity is connected to the earphone sound outlet through the first sound conduit, and the first sound conduit is connected to the outside of the shell through the second sound conduit.
[0007] Furthermore, one end of the first sound conduit, the other end of the second sound conduit and the sound outlet of the earphone are all equipped with damping nets.
[0008] Furthermore, one end of the second sound conduit is communicated with a middle position of the first sound conduit.
[0009] Furthermore, the shell, the first sound conduit, the second sound conduit, the vent hole and the earphone sound outlet are all connected in an integrally formed manner.
[0010] Furthermore, the planar diaphragm unit is a ring-shaped magnet structure or an array-type magnet structure.
[0011] Furthermore, the planar diaphragm unit comprises a planar diaphragm with a built-in planar voice coil and an annular magnet, and the annular magnet is arranged in parallel with the planar diaphragm.
[0012] Furthermore, the annular magnet includes an upper annular magnet and a lower annular magnet, and the planar diaphragm is arranged between the upper annular magnet and the lower annular magnet.
[0013] Furthermore, the planar diaphragm unit includes a planar diaphragm with a built-in etching circuit, and a plurality of planar array magnet groups formed by a single magnet array distribution, and the planar array magnet group is arranged in parallel with the planar diaphragm.
[0014] Furthermore, the planar array magnet group includes an upper planar array magnet group and a lower planar array magnet group, and the planar diaphragm is arranged between the upper planar array magnet group and the lower planar array magnet group.
[0015] Compared with the prior art, the utility model has the following beneficial effects: a low-frequency unit filtering structure of a multi-unit combination earphone comprises a shell, a planar diaphragm unit, a first sound conduit and a second sound conduit, a sound cavity is arranged in the shell, the planar diaphragm unit is installed in the sound cavity, and the sound cavity is divided into a front sound cavity and a rear sound cavity, the rear sound cavity is provided with an air hole so that the rear sound cavity is connected with the outside of the shell, one end of the first sound conduit is connected with the front sound cavity, the front sound cavity is connected to the earphone sound outlet through the first sound conduit, and the first sound conduit is connected with the outside of the shell through the second sound conduit. The utility model realizes separation and optimization of low frequency and medium and high frequency through the mutual cooperation of the shell, the planar diaphragm unit, the first sound conduit, the second sound conduit, the air vent, the earphone sound outlet and the damping net, in combination with the frequency division circuit. By adjusting the physical parameters such as the size of the sound cavity, the shape and length of the sound conduit, the air permeability of the damping net, and the electrical parameters of the frequency division circuit, not only can the frequency response curve and the phase curve of the low frequency unit and the medium frequency unit be smooth and continuous, but also the target frequency response curve can be matched through scientific acoustic tuning design to improve the fidelity of the sound. At the same time, since the other end of the second sound conduit is connected to the outside of the shell, it is no longer necessary to make a detour to connect with the rear sound cavity, so it is possible to avoid opening corresponding holes in the rear cavity, thereby making the structure more concise and facilitating production and manufacturing.
[0016] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0018] Figure 1 A partially simplified schematic diagram of a low-frequency unit filter structure of a multi-unit combined earphone provided in a specific embodiment of the utility model;
[0019] Figure 2 A partial structural schematic diagram of a low-frequency unit filter structure of a multi-unit combined earphone provided by a specific embodiment of the utility model;
[0020] Figure 3 A schematic diagram of the structure of a planar diaphragm unit in a low-frequency unit filter structure of a multi-unit combined earphone provided by a specific embodiment of the utility model;
[0021] Figure 4 The present invention is a schematic structural diagram of another planar diaphragm unit in a low-frequency unit filter structure of a multi-unit combination earphone provided by a specific embodiment of the present invention.
[0022] Reference numerals
[0023] 1. Shell; 11. Rear acoustic cavity; 111. Ventilation hole; 12. Front acoustic cavity;
[0024] 2. Planar diaphragm unit; 21. Planar diaphragm; 211. Planar voice coil; 22. Upper annular magnet; 221. Upper annular inner magnet; 222. Upper annular outer magnet; 23. Lower annular magnet; 231. Lower annular inner magnet; 232. Lower annular outer magnet;
[0025] 2A, planar diaphragm unit; 21A, planar diaphragm; 22A, upper planar array magnet group; 23A, lower planar array magnet group;
[0026] 3. The first sound conduit;
[0027] 4. Second sound conduit;
[0028] 5. Damping net. DETAILED DESCRIPTION
[0029] The following will be combined with the specific embodiments of the utility model to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0030] It should be understood that when used in this specification and claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections thereof.
[0031] It should also be understood that the terms used in the utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in the utility model specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.
[0032] It should be further understood that the term “and / or” used in the present specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.
[0033] like Figure 1-Figure 2 As shown, an embodiment of the utility model provides a low-frequency unit filtering structure of a multi-unit combination earphone, including a shell 1, a planar diaphragm unit, a first sound conduit 3 and a second sound conduit 4. A sound cavity is provided in the shell 1, the planar diaphragm unit is arranged in the sound cavity, and the sound cavity is divided into a front sound cavity 12 and a rear sound cavity 11, the rear sound cavity 11 is provided with an air hole 111 to connect the rear sound cavity 11 with the outside of the shell 1, one end of the first sound conduit 3 is connected with the front sound cavity 12, the front sound cavity 12 is connected to the earphone sound outlet through the first sound conduit 3, and the first sound conduit 3 is connected with the outside of the shell 1 through the second sound conduit 4.
[0034] The utility model realizes the separation and optimization of low frequency and medium and high frequency by the mutual cooperation of the shell 1, the planar diaphragm unit, the first sound conduit 3, the second sound conduit 4, the air vent 111, the earphone sound outlet and the damping net 5, and combines the frequency division circuit. By adjusting the physical parameters such as the size of the sound cavity, the shape and length of the sound conduit, the air permeability of the damping net, and the electrical parameters of the frequency division circuit, not only can the frequency response curve and phase curve of the low frequency unit and the medium frequency unit be smooth and continuous, but also can match the target frequency response curve through scientific acoustic tuning design to improve the fidelity of the sound. In addition, since the other end of the second sound conduit 4 is connected to the outside of the shell 1, it is no longer necessary to detour to connect with the rear sound cavity 11, and it can avoid opening the corresponding hole in the rear cavity, thereby making the structure more concise and facilitating production and manufacturing.
[0035] Damping nets 5 are arranged at one end of the first sound conduit 3, the other end of the second sound conduit 4 and the sound outlet of the earphone.
[0036] The damping nets 5 provided at various locations can not only prevent dust, but also play a damping role. Filters with different densities and mesh sizes can also adjust damping, filter high frequencies, and use high frequency changes to adjust the overall hearing experience. The damping net 5 can be made of compressed cotton, non-woven fabric, or mesh.
[0037] The shapes of the first sound conduit 3 and the second sound conduit 4 can be designed with specific paths, conduit inner diameters and lengths according to acoustic requirements. In this embodiment, the first sound conduit 3 and the second sound conduit 4 are both curved, which has the advantage of satisfying the conduit inner diameter and length required for specific acoustics within the limited earphone housing space, thereby achieving a target frequency response curve.
[0038] In one embodiment, one end of the second sound conduit 4 is connected to the middle position of the first sound conduit 3. The advantage is that by adjusting the middle position, or adjusting the inner diameter and length of the second sound conduit 4, the required low-frequency sensitivity of the planar diaphragm unit can be achieved.
[0039] In one embodiment, the housing 1, the first sound conduit 3, the second sound conduit 4, the vent hole 111 and the earphone sound outlet are all connected by integral molding, and this integral molding is usually done by 3D printing to meet the appearance requirements of the ear shell design and the acoustic requirements of the sound conduit of a specific shape. At the same time, 3D printing can also reduce the manufacturing difficulty and production assembly costs.
[0040] In one embodiment, the planar diaphragm unit is a ring-shaped magnetic structure or an array-shaped magnetic structure. It should be noted that the diaphragms in the ring-shaped magnetic structure or the array-shaped magnetic structure are all planar diaphragms.
[0041] The diameter of the planar diaphragm unit ranges from 5mm to 20mm. The planar diaphragm unit is controlled within this range and has a moderate size, which can provide a wider frequency response range, lower distortion and better sound field performance. In addition, compared with traditional dynamic magnetic units, they have a lighter and thinner diaphragm structure, which enables them to respond to audio signals faster and provide more precise and clear sound quality.
[0042] like Figure 3 As shown, the planar diaphragm unit 2 includes a planar diaphragm 21 with a planar voice coil 211 built therein and an annular magnet, and the annular magnet is arranged in parallel with the planar diaphragm 21. It should be noted that a single-layer annular magnet or a double-layer annular magnet can be designed for the planar diaphragm 21, wherein the single-layer annular magnet refers to a layer of annular magnet arranged on the upper side or the lower side of the planar diaphragm 21, and the double-layer annular magnet refers to a layer of annular magnet arranged on both the upper side and the lower side of the planar diaphragm 21.
[0043] like Figure 3As shown, the annular magnet includes an upper annular magnet 22 and a lower annular magnet 23, and the planar diaphragm 21 is disposed between the upper annular magnet 22 and the lower annular magnet 23. The upper annular magnet 22 includes an upper annular inner magnet 221 and an upper annular outer magnet 222, and the upper annular inner magnet 221 is located in the inner circle of the upper annular outer magnet 222. The lower annular magnet 23 includes a lower annular inner magnet 231 and a lower annular outer magnet 232, and the lower annular inner magnet 231 is located in the inner circle of the lower annular outer magnet 232.
[0044] like Figure 4 As shown, the planar diaphragm unit 2A includes a planar diaphragm 21A with an etched circuit built in, and a plurality of planar array magnet groups formed by a single magnet array distribution, and the planar array magnet group is arranged in parallel with the planar diaphragm 21A. It should be noted that a single-layer planar array magnet group or a double-layer planar array magnet group can be designed for the planar diaphragm 21A, wherein the single-layer planar array magnet group refers to a layer of planar array magnet group arranged on the upper side or the lower side of the planar diaphragm 21A, and the double-layer planar array magnet group refers to a layer of planar array magnet group arranged on both the upper side and the lower side of the planar diaphragm 21A.
[0045] like Figure 4 As shown, the planar array magnet group includes an upper planar array magnet group 22A and a lower planar array magnet group 23A, the planar diaphragm 21A is arranged between the upper planar array magnet group 22A and the lower planar array magnet group 23A, and the single magnet is in a long strip shape.
[0046] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.
Claims
1. A low-frequency unit filter structure of a multi-unit combination earphone, characterized in that: It includes a shell, a planar diaphragm unit, a first sound duct and a second sound duct, the shell is provided with a sound cavity, the planar diaphragm unit is installed in the sound cavity, and the sound cavity is divided into a front sound cavity and a rear sound cavity, the rear sound cavity is provided with an air hole so that the rear sound cavity is connected with the outside of the shell, one end of the first sound duct is connected with the front sound cavity, the front sound cavity is connected to the earphone sound outlet through the first sound duct, and the first sound duct is connected with the outside of the shell through the second sound duct.
2. The low-frequency unit filter structure of a multi-unit combined earphone according to claim 1, characterized in that: One end of the first sound conduit, the other end of the second sound conduit and the sound outlet of the earphone are all equipped with damping nets.
3. The low-frequency unit filter structure of a multi-unit combined earphone according to claim 2, characterized in that: One end of the second sound conduit is communicated with a middle position of the first sound conduit.
4. The low-frequency unit filter structure of a multi-unit combined earphone according to claim 1, characterized in that: The shell, the first sound conduit, the second sound conduit, the vent hole and the earphone sound outlet are all connected in an integrally formed manner.
5. A low-frequency unit filter structure of a multi-unit combination earphone according to any one of claims 1 to 4, characterized in that: The planar diaphragm unit is a ring-shaped magnet structure or an array-shaped magnet structure.
6. The low-frequency unit filter structure of a multi-unit combined earphone according to claim 5, characterized in that: The planar diaphragm unit comprises a planar diaphragm with a planar voice coil built in and an annular magnet, wherein the annular magnet is arranged in parallel with the planar diaphragm.
7. The low-frequency unit filter structure of a multi-unit combined earphone according to claim 6, characterized in that: The annular magnet comprises an upper annular magnet and a lower annular magnet, and the planar diaphragm is arranged between the upper annular magnet and the lower annular magnet.
8. The low-frequency unit filter structure of a multi-unit combined earphone according to claim 5, characterized in that: The planar diaphragm unit comprises a planar diaphragm with an etched circuit built in, and a plurality of planar array magnet groups formed by a single magnet array distribution, wherein the planar array magnet groups are arranged in parallel with the planar diaphragm.
9. The low-frequency unit filter structure of a multi-unit combined earphone according to claim 8, characterized in that: The planar array magnet group comprises an upper planar array magnet group and a lower planar array magnet group, and the planar diaphragm is arranged between the upper planar array magnet group and the lower planar array magnet group.