An acoustic switch and an in-ear speaker

Abstract

This invention discloses an acoustic switch and an in-ear speaker. The acoustic switch includes a housing, a first magnetic block, a second magnetic block, a motion component, and a coil. Both the first and second magnetic blocks are disposed within an inner cavity, facing each other with a gap between them, and a magnetic circuit is formed between the first magnetic block, the housing, and the second magnetic block. The motion component is movably disposed within the inner cavity and includes a magnet disposed outside the first magnetic block and a first magnetic plate disposed at one end of the magnet. The magnetic poles of the magnet are distributed along the direction of movement of the motion component, and the first magnetic plate is at least partially located within the gap. The coil is sleeved outside the second magnetic block, and when energized, it drives the motion component to switch between a first position and a second position. The acoustic switch of this invention can achieve on / off switching without the need for a spring contact, and only requires energizing the coil when switching positions, thus saving energy.

Description

Technical Field

[0001] This invention relates to an acoustic device, and more particularly to an acoustic switch and an in-ear speaker. Background Technology

[0002] In-ear speakers are acoustic devices that are inserted into the ear canal during use, such as in-ear headphones and hearing aids. In-ear speakers isolate the ear canal from the outside world, creating a relatively sealed space, resulting in excellent noise isolation and acoustic performance. However, this sealed ear canal can cause an ear-blocking effect, leading to a feeling of fullness in the ear, a hollow or unpleasant sensation in one's own voice, or excessive loudness, which negatively impacts the comfort of using in-ear speakers.

[0003] In related technologies, to eliminate the occlusion effect, a channel connecting the ear canal and the outside world is often created in the in-ear speaker. An acoustic switch is also installed inside the in-ear speaker, which can be turned on and off as needed, thus opening or closing the channel. For example, the acoustic switch is turned off when listening to music, making the ear canal relatively closed; the acoustic switch is turned on when the wearer speaks, opening the ear canal to the outside world, thereby eliminating the occlusion effect.

[0004] Acoustic switches in related technologies typically include a housing and a valve core, coil, and spring, all housed within the housing. The valve core is connected to the inner wall of the housing via the spring. The magnetic force generated when the coil is energized drives the valve core to move, opening or closing the valve seat and thus switching the acoustic switch on and off. The spring guides the movement of the valve core.

[0005] Because the spring has a fatigue limit, it is prone to deformation or even breakage after a certain period of use or when the displacement is too large. This will affect the normal operation of the acoustic switch and is not conducive to ensuring the reliability and service life of the acoustic switch.

[0006] Therefore, it is necessary to improve the existing technology to overcome the aforementioned defects. Summary of the Invention

[0007] The purpose of this invention is to provide an acoustic switch and an in-ear speaker, which can achieve on / off switching without the need for a spring.

[0008] To achieve the above-mentioned objectives, in one aspect, the present invention proposes an acoustic switch, comprising:

[0009] The outer shell has an inner cavity and a first through hole and a second through hole, both of which communicate with the inner cavity. The outer shell is made of a magnetically conductive material.

[0010] A first magnetically conductive block is disposed within the inner cavity;

[0011] The second magnetic block is disposed in the inner cavity. The first magnetic block and the second magnetic block are arranged opposite to each other with a gap between them. A magnetic circuit is formed between the first magnetic block, the outer shell and the second magnetic block.

[0012] A motion assembly, movably disposed within the inner cavity, includes a magnet disposed outside the first magnetically conductive block and a first magnetically conductive plate disposed at one end of the magnet. The magnetic poles of the magnet are distributed along the direction of motion of the motion assembly, and the first magnetically conductive plate is at least partially located within the interval space; and...

[0013] A coil is sleeved outside the second magnetic block. When the coil is energized, it drives the motion component to switch between a first position and a second position.

[0014] In the first position, the first magnetic plate and the first magnetic block are attracted to each other, and the motion component seals the first through hole; in the second position, the first magnetic plate and the second magnetic block are attracted to each other, and the motion component opens the first through hole.

[0015] Furthermore, the magnet is provided with a third through hole, which is sleeved on the outside of the first magnetically conductive block; or,

[0016] The number of magnets is two or more, and the two or more magnets surround the outer periphery of the first magnetic block.

[0017] Furthermore, the motion component is slidably connected to the inner wall of the housing and / or the motion component is slidably connected to the first magnetic block.

[0018] Furthermore, the motion component also includes a second magnetic plate sleeved outside the first magnetic block. The first magnetic plate and the second magnetic plate are respectively disposed at both ends of the magnet. The outer edge of the second magnetic plate extends beyond the outer edge of the magnet, and the distance between it and the inner wall of the outer shell is less than the distance between the first magnetic plate and the inner wall of the outer shell.

[0019] Furthermore, the first central hole of the second magnetic plate is clearance-fitted with the second outer peripheral surface of the first magnetic block; and / or,

[0020] The first outer peripheral surface of the second magnetic plate is clearance-fitted with the inner sidewall of the outer shell, and the second magnetic plate is provided with a first vent hole or a recessed first vent groove on the first outer peripheral surface of the second magnetic plate.

[0021] Furthermore, the motion component also includes a sealing element sleeved on the outside of the first magnetic block. The sealing element is made of a non-magnetic material. In the first position, the sealing element contacts the outer shell and seals the first through hole.

[0022] Furthermore, the seal is made of a hard material;

[0023] The second central hole of the second seal is clearance-fitted with the second outer peripheral surface of the first magnetic block; and / or,

[0024] The third outer peripheral surface of the seal is clearance-fitted with the inner sidewall of the housing, and the seal is provided with a second vent hole or a recessed second vent groove on the third outer peripheral surface of the seal.

[0025] Furthermore, the seal is made of an elastic material.

[0026] Furthermore, the motion component includes an outer guide sleeve disposed on the outer periphery of the magnet, the outer guide sleeve being slidably connected to the inner sidewall of the outer shell; and / or,

[0027] The motion component includes an inner guide sleeve disposed within the magnet, and the inner guide sleeve is slidably connected to the first magnetic block.

[0028] Furthermore, a first buffer pad is provided on the first magnetic block and / or the first magnetic plate, and the first buffer pad separates the first magnetic block and the first magnetic plate;

[0029] A second buffer pad is provided on the second magnetic block and / or the first magnetic plate, and the second buffer pad separates the second magnetic block and the first magnetic plate.

[0030] Furthermore, the motion component can be driven to switch between a first position and a second position by applying voltages in different directions to the coil; or,

[0031] The acoustic switch includes two coils, one of which drives the motion component to switch from a first position to a second position when energized, and the other of which drives the motion component to switch from a second position to a first position when energized.

[0032] Furthermore, the outer shell includes a first shell and a second shell connected together. The first shell includes a first end plate with a first through hole. The second shell includes a second end plate arranged parallel to the first end plate. The first magnetic block and the second magnetic block are respectively disposed on the first end plate and the second end plate.

[0033] On the other hand, the present invention provides an in-ear speaker including an acoustic switch as described in any of the preceding claims.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. In this invention, the moving component is movably disposed within the inner cavity of the housing, and can switch positions after the coil is energized, thereby opening or closing the first through hole to realize the opening and closing of the acoustic switch. The acoustic switch of this invention does not require a spring, thus reducing the likelihood of fatigue deformation or breakage of the spring affecting its reliability and service life. Furthermore, it eliminates the need for a spring to be assembled inside the housing, making installation more convenient and increasing production efficiency. In addition, the coil only needs to be energized when position switching is required, reducing energy consumption and heat generation.

[0036] 2. As an improvement, by configuring the motion component to slide against the inner wall of the housing and / or configuring the motion component to slide against the first magnetic block, the movement of the motion component can be guided, thereby improving its positional accuracy.

[0037] 3. As an improvement, the motion component includes a second magnetic plate, and the second magnetic plate is configured such that its outer edge extends beyond the outer edge of the magnet, and the distance between the second magnetic plate and the inner wall of the housing is smaller than the distance between the first magnetic plate and the inner wall of the housing, which can reduce the air gap between the second magnetic plate and the housing and improve the magnetic conduction efficiency. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of an acoustic switch according to one embodiment of the present invention.

[0039] Figure 2 yes Figure 1 The exploded view of the acoustic switch shown.

[0040] Figure 3 yes Figure 1 The acoustic switch shown is a three-dimensional cross-sectional view.

[0041] Figure 4 yes Figure 1 The figure shows a cross-sectional view of the acoustic switch, and the moving parts are not shown.

[0042] Figure 5 This is a schematic diagram of the structure of a motion component according to one embodiment of the present invention, in which the magnet is block-shaped.

[0043] Figure 6 yes Figure 1 The image shows a cross-sectional view of the acoustic switch in its first position.

[0044] Figure 7 yes Figure 1 The image shows a cross-sectional view of the acoustic switch in its second position.

[0045] Figure 8 This is a cross-sectional view of an acoustic switch according to one embodiment of the present invention, wherein the first magnetic plate is annular.

[0046] Figure 9 This is a schematic diagram of the structure of a motion component according to one embodiment of the present invention.

[0047] Figure 10 This is a schematic diagram of the structure of the second magnetic plate according to one embodiment of the present invention.

[0048] Figure 11 yes Figure 10 The diagram shows the second magnetic plate mating with the inner wall of the outer casing.

[0049] Figure 12 This is a schematic diagram of the second magnetic plate and the inner wall of the outer shell in one embodiment of the present invention. In the figure, the second magnetic plate is provided with a first vent hole.

[0050] Figure 13 This is a schematic diagram showing the clearance fit between the first central hole of the second magnetic plate and the second outer peripheral surface of the first magnetic block in this invention.

[0051] Figure 14 This is a schematic diagram of the clearance fit between the third outer peripheral surface of the seal and the inner sidewall of the housing in this invention.

[0052] Figure 15 This is a schematic diagram showing the clearance fit between the second central hole of the sealing element and the second outer peripheral surface of the first magnetic block in this invention.

[0053] Figure 16 This is a schematic diagram of the motion component in this invention being slidably connected to the inner wall of the outer shell via an outer guide sleeve.

[0054] Figure 17 This is a schematic diagram of the motion component in this invention being slidably connected via the first magnetic block of the inner guide sleeve.

[0055] Figure 18 This is a schematic diagram of an acoustic switch with two coils according to one embodiment of the present invention.

[0056] Figure 19 This is a schematic diagram of an in-ear speaker located in the ear canal according to one embodiment of the present invention. Detailed Implementation

[0057] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0058] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0059] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0060] like Figures 1 to 3 As shown, an acoustic switch corresponding to a preferred embodiment of the present invention includes a housing 1, a first magnetic block 2, a second magnetic block 3, a motion component 4, and a coil 5.

[0061] The outer shell 1 is made of magnetic material and has an inner cavity 10, a first through hole 11 and a second through hole 12. The first through hole 11 and the second through hole 12 are both connected to the inner cavity 10 and the outside, so that an airflow channel is formed between the first through hole 11, the inner cavity 10 and the second through hole 12.

[0062] The first magnetically conductive block 2 and the second magnetically conductive block 3 are both disposed within the inner cavity 10 and connected to the outer shell 1. Both the first magnetically conductive block 2 and the second magnetically conductive block 3 are made of magnetically conductive material, so that a magnetically conductive circuit can be formed between the first magnetically conductive block 2, the second magnetically conductive block 3, and the outer shell 1. Figure 4 As shown, the first magnetic block 2 and the second magnetic block 3 are arranged opposite to each other, with a gap space 20 between them.

[0063] To facilitate the installation of components into the inner cavity 10, the outer shell 1 can be constructed from multiple connected parts. In a preferred embodiment, refer to... Figures 1 to 3The outer casing 1 includes a first casing 14 and a second casing 15. The first casing 14 includes a first end plate 140 and a first annular wall 141 protruding from the outer edge of the first end plate 140 in a direction perpendicular to the first end plate 140. The second casing 15 includes a second end plate 150 and a second annular wall 151 protruding from the outer edge of the second end plate 150 in a direction perpendicular to the second end plate 150. The end faces of the first annular wall 141 and the second annular wall 151 are connected by means such as adhesive or welding. The first end plate 140 and the second end plate 150 are arranged parallel to each other. The first magnetic block 2 and the second magnetic block 3 are respectively disposed on the first end plate 140 and the second end plate 150. The second through hole 12 is disposed on the second end plate 150, or on the second annular wall 151, or simultaneously on the second end plate 150 and the second annular wall 151 (see reference). Figure 3 ).

[0064] It is understood that the first magnetic block 2 can be a separate component from the first housing 14, and the two can be connected by welding or bonding; the first magnetic block 2 can also be integrally formed with the first housing 14, that is, the first magnetic block 2 is part of the first housing 14. Similarly, the second magnetic block 2 and the second housing 15 can also be two separate parts or an integrally formed single part.

[0065] The motion assembly 4 is movably disposed within the inner cavity 10, and is capable of reciprocating linear motion within the inner cavity 10. The motion assembly 4 includes a magnet 40 disposed outside the first magnetic block 2 and a first magnetic plate 41 disposed at one end of the magnet 40. (Refer to...) Figure 3 The first magnetic plate 41 is connected to the end face of the magnet 40 facing the second magnetic block 3. The first magnetic plate 41 is at least partially located within the space 20.

[0066] The magnet 40 is magnetic, and may be, for example, a magnet or a magnetic steel. The two magnetic poles of the magnet 40 are arranged along the axis of motion of the moving assembly 4, and may have the N pole on top and the S pole on the bottom, or vice versa. Since the first magnetic plate 41 is connected to the magnet 40, the first magnetic plate 41 will be magnetized, and the portion of the first magnetic plate 41 located within the space 20 will have polarity. For example, Figure 6 In the middle, the N pole of the magnet 40 is on top and the S pole is on the bottom. At this time, the polarity of the part of the first magnetic plate 41 located in the space 20 is the S pole.

[0067] In a preferred embodiment, such as Figure 2 and Figure 3The magnet 40 is ring-shaped, has a third through hole 400, and is sleeved on the outside of the first magnetically conductive block 2. In another preferred embodiment, the magnet 40 is block-shaped, and there is one or more of them. The magnet 40 is disposed on the outside of the first magnetically conductive block 2, opposite to the outer peripheral surface of the first magnetically conductive block 2. When there are two or more magnets 40, they surround the outer periphery of the first magnetically conductive block 2. Preferably, two or more magnets 40 are distributed on a circle centered on the center of the first magnetically conductive block 2, such as... Figure 5 As shown, Figure 5 Four magnets 40 are shown distributed around the outer periphery of the first magnetically conductive block 2. Adjacent magnets 40 may or may not be connected. The following description uses a ring-shaped arrangement of the magnets 40 as an example.

[0068] The first magnetic plate 41 can be annular (see reference). Figure 8 It can also be a solid (unperforated) plate (see reference). Figure 6 ), Figure 6 In the middle, the first magnetic plate 41 is a solid plate, and the magnetic attraction between it and the first magnetic block 2 and the second magnetic block 3 is greater.

[0069] Coil 5 is a hollow coil, which is sleeved outside the second magnetic block 3 and fixed to the outer casing 1, for example, by adhesive. The motion assembly 4 includes a first position and a second position. In the first position, reference... Figure 6 When the first magnetic plate 41 and the first magnetic block 2 are attracted together, the moving component 4 seals the first through hole 11, thus closing the airflow channel. In the second position, refer to... Figure 7 The first magnetic plate 41 and the second magnetic block 3 are attracted together, and the motion component 4 opens the first through hole 11, so that the airflow channel is open.

[0070] When coil 5 is energized, it can drive motion component 4 to switch between a first position and a second position. Specifically, when coil 5 is energized, a magnetic circuit is formed between the outer shell 1, the first magnetic block 2, and the second magnetic block 3. Figure 6 and Figure 7 (The magnetic circuit is illustrated by a dashed line with an arrow). The first magnetic block 2 and the second magnetic block 3 are polarized, and the polarities of the adjacent ends of the first magnetic block 2 and the second magnetic block 3 are different. For example, when the first magnetic block 2 is the N pole, the second magnetic block 3 is the S pole; when the first magnetic block 2 is the S pole, the second magnetic block 3 is the N pole. In this way, the motion component 4 can be driven to switch between the first position and the second position by the attraction or repulsion between the first magnetic block 2, the second magnetic block 3 and the first magnetic plate 41.

[0071] For example, in Figure 6In the illustrated scenario, the N pole of magnet 40 is at the top and the S pole is at the bottom, and the polarity of the portion of the first magnetic plate 41 located within the space 20 is the S pole. The motion component 4 is in the first position. When the position of the motion component 4 needs to be changed, it is only necessary to energize the coil 5, causing the first magnetic block 2 and the second magnetic block 3 to be polarized as S and N poles respectively. At this time, the first magnetic block 2 applies a repulsive force to the first magnetic plate 41, and the second magnetic block 3 applies an attractive force to the first magnetic plate 41. The first magnetic plate 41 is attracted to the second magnetic block 3, and the upper end face of the motion component 4 disengages from the first end plate 140, thereby opening the first through hole 11. The motion component 4 is then switched to the second position. Obviously, referring to... Figure 7 In the second position, simply change the direction of the magnetic field generated by the energized coil 5 so that the first magnetic block 2 and the second magnetic block 3 are polarized into N pole and S pole respectively. At this time, the first magnetic block 2 will apply an attractive force to the first magnetic plate 41, and the second magnetic block 3 will apply a repulsive force to the first magnetic plate 41. The first magnetic plate 41 will be attracted to the first magnetic block 2, and the upper end face of the motion component 4 will contact the first end plate 140 to close the first through hole 11. The motion component 4 is switched to the first position.

[0072] By setting the first magnetic block 2 and the second magnetic block 3 to be electrically energized by the coil 5, the moving component 4, which is movably disposed within the inner cavity 10, can switch between a first position and a second position, thereby opening or closing the airflow channel. This eliminates the need for springs or other elastic components, reducing the risk of performance issues due to spring fatigue deformation or breakage, and ensuring high reliability of the switching action. Furthermore, it reduces assembly difficulty and improves production efficiency. In addition, the coil 5 only needs to be energized when the position needs to be switched. After the position switch is completed, due to the magnetic attraction between the first magnetic plate 41 and the first magnetic block 2 or the second magnetic block 3, the coil 5 does not need to be continuously energized, reducing energy consumption and heat generation, further improving the lifespan and reliability of the acoustic switch.

[0073] In a preferred embodiment, the outer shell 1, the first magnetic block 2, and the second magnetic block 3 are all cylindrical in shape, and the outer shell 1, the first magnetic block 2, and the second magnetic block 3 are arranged coaxially. The moving component 4 reciprocates along the axis of the outer shell 1 and the first magnetic block 2.

[0074] To improve magnetic permeability, reference Figure 3 , Figure 9 , Figure 10 and Figure 11The motion component 4 includes an annular second magnetic guide plate 42, made of magnetically conductive material. It is sleeved around the first magnetic guide block 2 and connected to the surface of the magnet 40 facing the first end plate 140. The second magnetic guide plate 42 and the first magnetic guide plate 41 are respectively located at both ends of the magnet 40. The outer edge of the second magnetic guide plate 42 extends beyond the outer edge of the magnet 40, and the distance between it and the inner wall 13 of the outer casing 1 is less than the distance between the first magnetic guide plate 41 and the inner wall 13 of the outer casing 1. Thus, the first outer peripheral surface 420 of the second magnetic guide plate 42 is closer to the inner wall 13 of the outer casing 1, resulting in a smaller air gap. This allows for more efficient guidance of magnetic field lines to the outer casing 1, leading to higher magnetic conductivity and better reliability of position switching.

[0075] As a preferred embodiment, refer to Figure 3 and Figure 9 The motion component 4 also includes an annular seal 43 made of a non-magnetic material, which is fitted over the outside of the first magnetic block 2 and located at the end of the motion component 4 near the first end plate 140. The seal 43 is connected to the surface of the second magnetic plate 42 facing the first end plate 140. In the first position, the seal 43 contacts the inner end wall 143 of the housing 1 and seals the first through hole 11. By providing the seal 43 made of non-magnetic material to separate the second magnetic plate 42 and the first end plate 140, the motion component 4 can be switched more sensitively from the first position to the second position.

[0076] The seal 43 can be made of a hard material, such as metal or ceramic; or it can be made of an elastic material, such as rubber, elastic plastic or silicone. Preferably, the seal 4 is made of an elastic material, which can play a role in buffering, vibration reduction and noise reduction, and its sealing effect on the first through hole 11 is better.

[0077] In order to enable the motion component 4 to reliably vibrate along its motion axis and reduce the positional deviation of the motion component 4 during the motion, the motion component 4 is configured to be slidably connected to the inner wall 13 of the housing 1 and / or the motion component 4 is configured to be slidably connected to the first magnetic block 2. In this way, the motion component 4 can slide along the inner wall 13 of the housing 1 and / or slide along the outer peripheral surface of the first magnetic block 2, and is not prone to radial displacement.

[0078] Specifically, in the first implementation, such as Figure 3 , Figures 9 to 12 As shown, the first outer peripheral surface 420 of the second magnetic plate 42 is clearance-fitted with the inner sidewall 13 of the outer casing 1, so that the second magnetic plate 42 and the outer casing 1 are slidably connected, thereby guiding the movement of the moving component 4. In order to make the airflow channel more unobstructed in the second position, the second magnetic plate 42 is provided with a first vent hole 421 penetrating its upper and lower surfaces (see reference). Figure 12Alternatively, the first outer peripheral surface 420 of the second magnetic plate 42 may be provided with a recessed first ventilation groove 422 (see reference). Figure 10 and Figure 11 Airflow can pass through the first vent 421 or the first vent groove 422. In this embodiment, the second magnetic plate 42 is close to the inner sidewall 13 of the outer casing 1, and its magnetic conductivity is high.

[0079] In the second implementation, such as Figure 13 As shown, the first central hole 423 of the second magnetic plate 42 is fitted with the second outer peripheral surface 21 of the first magnetic block 2 with a clearance, so that the second magnetic plate 42 and the first magnetic block 2 are slidably connected, thereby guiding the movement of the motion component 4.

[0080] In the third implementation, such as Figure 14 As shown, the seal 43 is made of a hard material, and its third outer peripheral surface 430 is clearance-fitted with the inner sidewall 13 of the outer shell 1 to achieve a sliding connection between the seal 43 and the outer shell 1, thereby guiding the movement of the moving component 4. Similarly, in order to make the airflow channel more unobstructed in the second position, the seal 43 is provided with a second vent hole 431 penetrating its upper and lower surfaces, or the third outer peripheral surface 430 of the seal 43 is provided with a recessed second vent groove (the second vent groove can refer to the structure of the first vent groove 422), and the airflow can pass through the first vent hole 421 or the first vent groove.

[0081] In the fourth embodiment, such as Figure 15 As shown, the seal 43 is made of a hard material, and its second central hole 433 is in clearance fit with the second outer peripheral surface 21 of the first magnetic block 2 so that the seal 43 and the first magnetic block 2 can be slidably connected, thereby guiding the movement of the moving component 4.

[0082] In the fifth implementation, such as Figure 16 As shown, the motion component 4 also includes an outer guide sleeve 44 made of non-magnetic material, which is sleeved around the outer periphery of the magnet 40. The outer guide sleeve 44 is in clearance fit with the inner sidewall 13 of the outer shell 1, thereby playing a guiding role and allowing the motion component 4 to slide in connection with the inner sidewall 13 of the outer shell 1. Similarly, a third vent hole 441 or a third vent groove may be provided on the outer guide sleeve 44.

[0083] In the sixth implementation, such as Figure 17 As shown, the motion component 4 also includes an inner guide sleeve 45 made of non-magnetic material connected inside the magnet 40. The inner guide sleeve 45 is in clearance fit with the first magnetic block 2, thereby playing a guiding role and making the motion component 4 and the first magnetic block 2 slide in connection.

[0084] It should be noted that the above-mentioned multiple implementation methods can be selected or used in combination. For example, the first implementation method and the second implementation method can be used in combination. In this case, the first outer peripheral surface 420 of the second magnetic plate 42 is in clearance fit with the inner side wall 13 of the outer shell 1, and the first central hole 423 of the second magnetic plate 42 is in clearance fit with the second outer peripheral surface 21 of the first magnetic block 2.

[0085] As described above, after coil 5 is energized, the two opposite ends of the first magnetic block 2 and the second magnetic block 3 are polarized into opposite poles, and changing the direction of the magnetic field generated by coil 5 can change the polarity of the first magnetic block 2 and the second magnetic block 3. In one embodiment, by applying voltages in different directions to the same coil 5, the direction of the magnetic field generated by coil 5 is changed, thereby changing the polarity of the first magnetic block 2 and the second magnetic block 3. In another embodiment, as... Figure 18 As shown, two coils 5 are arranged outside the second magnetic block 3. When energized, the two coils 5 generate magnetic fields with different directions. The directions of the magnetic fields generated by the two coils 5 can be changed by setting the winding directions of the two coils 5 to opposite forms or by setting the directions of the voltages applied to the two coils 5 to opposite forms. Thus, by energizing different coils 5, the polarity of the first magnetic block 2 and the second magnetic block 3 can be changed. For example, when one coil 5 is energized, the first magnetic block 2 and the second magnetic block 3 are polarized as N and S poles, respectively. Then, when that coil 5 is de-energized and the other coil 5 is energized, the first magnetic block 2 and the second magnetic block 3 are polarized as S and N poles, respectively.

[0086] To reduce noise generated during the position switching of the moving component 4, and to prevent the first magnetic plate 41 from directly contacting the first magnetic block 2 or the second magnetic block 3, which would result in excessive attraction and difficulty in detachment, the acoustic switch also includes a first buffer pad 6 for separating the first magnetic block 2 and the first magnetic plate 41, and a second buffer pad 60 for separating the second magnetic block 3 and the first magnetic plate 41. The first buffer pad 6 and the second buffer pad 60 are made of non-magnetic materials, and are soft materials, such as plastic, rubber, sponge, etc., which can buffer, absorb vibration and reduce noise while isolating the first magnetic plate 41 and the magnetic block.

[0087] For example, refer to Figure 3 and Figure 6A first buffer pad 6 is provided on the surface of the first magnetic block 2 facing the first magnetic plate 41. In the first position, the first magnetic plate 41 and the first magnetic block 2 are separated by the first buffer pad 6. Thus, when the moving component 4 switches from the second position to the first position, the first buffer pad 6 can reduce vibration and noise, and also act as a buffer to prevent damage to the corresponding components due to impact. Alternatively, the first buffer pad 6 can be provided on the surface of the first magnetic plate 41 facing the first magnetic block 2, or simultaneously on both the surface of the first magnetic block 2 facing the first magnetic plate 41 and the surface of the first magnetic plate 41 facing the first magnetic block 2.

[0088] Similarly, see reference Figure 3 and Figure 7 A second buffer pad 60 is provided on the surface of the second magnetic block 3 facing the first magnetic plate 41. In the second position, the first magnetic plate 41 and the second magnetic block 3 are separated by the second buffer pad 60. Thus, when the moving component 4 switches from the first position to the second position, the first buffer pad 60 can play a role in vibration reduction, noise reduction, and buffering. Alternatively, the second buffer pad 60 can also be provided on the surface of the first magnetic plate 41 facing the second magnetic block 3, or simultaneously on both the surface of the second magnetic block 3 facing the first magnetic plate 41 and the surface of the first magnetic plate 41 facing the second magnetic block 3.

[0089] The present invention also proposes an in-ear speaker, such as Figure 19 As shown, it includes a housing 8 and an acoustic switch 7 disposed within the housing 8. In use, the in-ear speaker is placed inside the ear canal 9. The housing 8 includes a first end facing the inside of the ear canal 9 and a second end facing the outside. The housing 8 has a channel 80 connecting the first end and the second end. The acoustic switch 7 is disposed on the channel 80, and the opening and closing of the channel 80 can be controlled by controlling the on / off state of the acoustic switch 7. The control system of the in-ear speaker can detect whether the person is speaking. When the person is speaking, the control system controls the acoustic switch to open. At this time, the inside and outside of the ear canal 9 are connected through the channel 80, which can eliminate the occlusion effect. When the person is not speaking, the control system controls the acoustic switch to close. At this time, a sealed space is formed inside the ear canal 9, which can better isolate external noise and improve the acoustic performance of the in-ear speaker.

[0090] The above are merely specific embodiments of the present invention, and any improvements made based on the concept of the present invention shall be considered within the scope of protection of the present invention.

Claims

1. An acoustic switch, characterized in that, include: The outer shell (1) has an inner cavity (10) and a first through hole (11) and a second through hole (12) that are both connected to the inner cavity (10). The outer shell (1) is made of magnetic material. The outer shell (1) includes a first end plate (140) and the first end plate (140) has the first through hole (11). The first magnetic block (2) is disposed in the inner cavity (10) and is disposed on the first end plate (140); The second magnetic block (3) is disposed in the inner cavity (10). The first magnetic block (2) and the second magnetic block (3) are arranged opposite to each other, with a gap space (20) between them. A magnetic circuit is formed between the first magnetic block (2), the outer shell (1) and the second magnetic block (3). A motion assembly (4) is movably disposed within the inner cavity (10). The motion assembly (4) includes a magnet (40) disposed outside the first magnetic block (2) and a first magnetic plate (41) disposed at one end of the magnet (40). The magnetic poles of the magnet (40) are distributed along the direction of motion of the motion assembly (4). The first magnetic plate (41) is at least partially located within the space (20). The magnet (40) is disposed opposite to the outer peripheral surface of the first magnetic block (2). A coil (5) is sleeved outside the second magnetic block (3). When the coil (5) is energized, it drives the motion component (4) to switch between the first position and the second position. In the first position, the first magnetic plate (41) is attracted to the first magnetic block (2), and the motion component (4) contacts the first end plate (140) to seal the first through hole (11); in the second position, the first magnetic plate (41) is attracted to the second magnetic block (3), and the motion component (4) opens the first through hole (11). The magnet (40) is provided with a third through hole (400), which is sleeved on the outside of the first magnetic block (2); or, the number of the magnets (40) is two or more, and the two or more magnets (40) surround the outer periphery of the first magnetic block (2); The motion component (4) is slidably connected to the inner wall (13) of the outer shell (1) and / or the motion component (4) is slidably connected to the first magnetic block (2).

2. The acoustic switch as described in claim 1, characterized in that, The motion component (4) further includes a second magnetic plate (42) sleeved on the outside of the first magnetic block (2). The first magnetic plate (41) and the second magnetic plate (42) are respectively disposed at both ends of the magnet (40). The outer edge of the second magnetic plate (42) extends beyond the outer edge of the magnet (40), and the distance between the outer edge of the second magnetic plate (42) and the inner wall (13) of the outer shell (1) is less than the distance between the first magnetic plate (41) and the inner wall (13) of the outer shell (1).

3. The acoustic switch as described in claim 2, characterized in that, The first central hole (423) of the second magnetic plate (42) is clearance-fitted with the second outer peripheral surface (21) of the first magnetic block (2); and / or, The first outer peripheral surface (420) of the second magnetic plate (42) is in clearance fit with the inner sidewall (13) of the outer shell (1), and the second magnetic plate (42) is provided with a first vent hole (421) or the first outer peripheral surface (420) of the second magnetic plate (42) is provided with a recessed first vent groove (422).

4. The acoustic switch as described in any one of claims 1 to 3, characterized in that, The motion component (4) also includes a sealing element (43) sleeved on the outside of the first magnetic block (2). The sealing element (43) is made of non-magnetic material. In the first position, the sealing element (43) contacts the outer shell (1) and seals the first through hole (11).

5. The acoustic switch as described in claim 4, characterized in that, The seal (43) is made of a hard material; The second central hole (433) of the seal (43) is clearance-fitted with the second outer peripheral surface (21) of the first magnetic block (2); and / or, The third outer peripheral surface (430) of the sealing element (43) is in clearance fit with the inner sidewall (13) of the outer shell (1), and the sealing element (43) is provided with a second vent hole (431) or the third outer peripheral surface (430) of the sealing element (43) is provided with a concave second vent groove.

6. The acoustic switch as described in claim 4, characterized in that, The seal (43) is made of an elastic material.

7. The acoustic switch as described in any one of claims 1 to 3, characterized in that, The motion component (4) includes an outer guide sleeve (44) disposed on the outer periphery of the magnet (40), the outer guide sleeve (44) being slidably connected to the inner sidewall (13) of the outer shell (1); and / or, The motion component (4) includes an inner guide sleeve (45) disposed within the magnet (40), and the inner guide sleeve (45) is slidably connected to the first magnetic block (2).

8. The acoustic switch as described in any one of claims 1 to 3, characterized in that, A first buffer pad (6) is provided on the first magnetic block (2) and / or the first magnetic plate (41). The first buffer pad (6) is made of non-magnetic material and the first buffer pad (6) separates the first magnetic block (2) and the first magnetic plate (41). A second buffer pad (60) is provided on the second magnetic block (3) and / or the first magnetic plate (41). The second buffer pad (60) is made of non-magnetic material and separates the second magnetic block (3) and the first magnetic plate (41).

9. The acoustic switch as described in any one of claims 1 to 3, characterized in that, The motion component (4) is driven to switch between a first position and a second position by applying voltages in different directions to the coil (5); or, The acoustic switch includes two coils (5), one of which drives the motion component (4) to switch from a first position to a second position after being energized, and the other drives the motion component (4) to switch from a second position to a first position after being energized.

10. The acoustic switch according to any one of claims 1 to 3, characterized in that, The outer shell (1) includes a first shell (14) and a second shell (15) connected together. The first shell (14) includes a first end plate (140), and the second shell (15) includes a second end plate (150) arranged parallel to the first end plate (140). The second magnetic block (3) is disposed on the second end plate (150).

11. An in-ear speaker, characterized in that, Includes the acoustic switch as described in any one of claims 1 to 10.

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