Bone conduction oscillator and electronic equipment

Abstract

The invention discloses a bone conduction oscillator and electronic equipment, and relates to the technical field of acoustics, and the bone conduction oscillator comprises a housing assembly, a permanent magnet magnetic circuit system, two coils, a magnetic conduction plate assembly and a reset assembly. The shell assembly is made of a magnetic conductive material; the permanent magnetic circuit system is arranged in the shell assembly, the permanent magnetic circuit system comprises a yoke iron assembly and a magnet assembly, and the magnet assembly comprises two magnets with opposite heteropoles; the coils are arranged in the shell assembly, and the two coils are located on the two sides of the permanent magnet magnetic circuit system respectively. The magnetic conductive plate assembly comprises two magnetic conductive plates which are arranged in the two coils in a penetrating mode respectively, the magnetic conductive plates extend to the position between the two magnets of the magnet assembly, and the adjacent ends of the two magnetic conductive plates are not directly connected in a magnetic conductive mode. The reset assembly is connected between the magnetic conductive plate assembly and the permanent magnet magnetic circuit system and comprises an elastic sheet used for providing elastic force. The bone conduction vibrator is better in driving force and sensitivity.

Description

Technical Field

[0001] The present invention relates to the field of acoustic technologies, and particularly to a bone conduction vibrator and an electronic device. Background Art

[0002] A bone conduction vibrator, also known as a bone conduction loudspeaker, is a transducer device that converts an electrical signal into a mechanical vibration of a corresponding frequency. The mechanical vibration generated by the bone conduction vibrator when receiving an electrical signal is transmitted to the auditory center through the skull, thereby enabling a person to hear sound. Bone conduction vibrators are widely used in wearable electronic devices such as headphones, hearing aids, smart helmets, and smart glasses.

[0003] Chinese Patent with Publication No. CN202334867U discloses a moving iron microphone unit for a bone conduction hearing aid and a sound generating device, which includes components such as a vibration conduction device, an armature, a diaphragm, two guide magnetic cores, two magnet sheets, and an electromagnetic induction coil. The armature is disposed within the electromagnetic induction coil and located between the two magnet sheets. The fixed end of the armature, the guide magnetic core, the magnet sheet, and the electromagnetic induction coil are fixed together. The free end of the armature is connected to the vibration conduction device. When the coil is energized, the armature is polarized, and its magnetic field interacts with that of the magnet sheet, causing the driving magnet mechanism composed of the armature, the guide magnetic core, the magnet sheet, and the electromagnetic induction coil to generate a vibration displacement, thereby achieving bone conduction sound transmission.

[0004] The above-mentioned moving iron microphone unit realizes bone conduction sound transmission by utilizing the weight of the driving magnet mechanism itself, without the need to additionally provide a weight-increasing module on the diaphragm, thus simplifying the product structure. However, there are still some aspects worthy of improvement.

[0005] For example, the reset of the above-mentioned moving iron microphone unit relies on the elasticity of the armature. The stiffness coefficient of the armature is relatively large, resulting in poor overall sensitivity (especially low-frequency sensitivity).

[0006] For another example, since the armature is fixed at one end and suspended at the other end, during vibration, it is difficult for the driving magnet mechanism to perform reliable linear motion relative to the free end (i.e., the suspended end), but rather approximates a swing with the free end as the fulcrum, resulting in low vibration efficiency and easily causing a deterioration in the sound listening effect.

[0007] For another example, its driving magnet mechanism needs to drive the diaphragm to vibrate, increasing the resistance, which is not conducive to increasing the driving force and sensitivity of bone conduction sound transmission.

[0008] In summary, the above structure still has room for improvement in terms of sound generation effect, sensitivity improvement, and vibration stability.

[0009] The above content is only used to help understand the technical solution of the present application and does not constitute an admission that the above is prior art.

[0010] Therefore, it is necessary to improve the existing technology to overcome the above-mentioned defects in the existing technology.

[0011] The above content is only used to help understand the technical solution of this application, and does not constitute an admission that the above is the prior art. Summary of the Invention

[0012] The purpose of the present invention is to provide a bone conduction oscillator and an electronic device to improve its sensitivity.

[0013] To achieve the above-mentioned invention purpose, on the one hand, the present invention proposes a bone conduction oscillator, including:

[0014] A housing assembly made of a magnetic conductive material;

[0015] A permanent magnet magnetic circuit system disposed within the housing assembly, the permanent magnet magnetic circuit system including an armature assembly and two magnet assemblies, the magnet assemblies forming a magnetic circuit through the armature assembly, and each magnet assembly including two magnets arranged with opposite poles facing each other;

[0016] Two coils disposed within the housing assembly, and the two coils are respectively located on both sides of the permanent magnet magnetic circuit system;

[0017] A magnetic conductive plate assembly including two magnetic conductive plates respectively passing through the two coils, and the magnetic conductive plates extending between the two magnets of the magnet assembly adjacent to the coil through which they pass, and the adjacent ends of the two magnetic conductive plates are not directly magnetically connected; and,

[0018] A reset assembly connected between the magnetic conductive plate assembly and the permanent magnet magnetic circuit system, including a spring piece for providing elastic force.

[0019] On the other hand, the present invention proposes an electronic device including the bone conduction oscillator as described above.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] According to some embodiments of the present invention, the bone conduction oscillator includes two magnet assemblies and two coils. The relative vibration of the magnetic conductive plate assembly and the permanent magnet magnetic circuit system is achieved through the cooperation of the two coils and the two magnet assemblies, which is beneficial to increasing the driving force and improving the sensitivity. At the same time, the housing assembly is made of a magnetic conductive material, and the magnetic field generated by the energized coil can form a magnetic circuit through the housing assembly, which is beneficial to improving the magnetic field utilization rate and further improving the driving force and sensitivity. In addition, the reset force is provided by the spring piece, and the overall stiffness coefficient (K value) can be made smaller, which is beneficial to reducing the low-frequency resonance frequency (low-frequency F0) of the vibration system, making the low-frequency sensitivity higher and the bass effect better. Description of the Drawings

[0022] Figure 1 It is a three-dimensional schematic diagram of a bone conduction vibrator in some embodiments of the present invention.

[0023] Figure 2 It is Figure 1 The three-dimensional schematic diagram of the bone conduction vibrator shown in the figure, in which the housing assembly is separated.

[0024] Figure 3 It is Figure 1 The cross-sectional schematic diagram of the bone conduction vibrator shown in the figure.

[0025] Figure 4 It is Figure 3 The schematic diagram of the magnetic circuit of the magnetic field generated at a certain moment after the coil of the bone conduction vibrator shown in the figure is energized.

[0026] Figure 5 It is Figure 3 The cross-sectional schematic diagram of a part of the bone conduction vibrator shown in the figure.

[0027] Figure 6 It is Figure 1 The exploded view of the bone conduction vibrator shown in the figure.

[0028] Figure 7 It is Figure 1 The schematic diagram of the permanent magnet magnetic circuit in the bone conduction vibrator shown in the figure.

[0029] Figure 8 It is a schematic diagram in which each magnet assembly in some embodiments of the present invention corresponds to a set of yoke iron assemblies.

[0030] Figure 9 It is a three-dimensional schematic diagram of a yoke iron assembly in some embodiments of the present invention.

[0031] Figure 10 It is Figure 1 The schematic diagram of the position of the permanent magnet magnetic circuit system and the magnetic conduction plate assembly of the bone conduction vibrator shown in the figure.

[0032] Figure 11 It is a cross-sectional schematic diagram of a bone conduction vibrator in some embodiments of the present invention. In the figure, a spacer space is formed between two magnetic conduction plates.

[0033] Figure 12 It is a cross-sectional schematic diagram of a bone conduction vibrator in some embodiments of the present invention. In the figure, two magnetic conduction plates are connected by a connecting block.

[0034] Figure 13 It is a cross-sectional schematic diagram of a bone conduction vibrator in some embodiments of the present invention. In the figure, two magnetic conduction plates are connected by a gasket.

[0035] Figure 14 It is a three-dimensional schematic diagram of a magnetic conduction plate assembly in some embodiments of the present invention.

[0036] Figure 15 is Figure 1 The cross-sectional schematic diagram of the bone conduction oscillator shown when the housing assembly is not shown.

[0037] Figure 16 The three-dimensional schematic diagram of the shrapnel in some embodiments of the present invention.

[0038] Figure 17 The three-dimensional schematic diagram of the bone conduction oscillator in some embodiments of the present invention when the housing assembly is not shown. In the figure, the reset assembly includes two shrapnels.

[0039] Figure 18 is Figure 17 The cross-sectional schematic diagram of the bone conduction oscillator shown.

[0040] Figure 19 The cross-sectional schematic diagram of the bone conduction oscillator in some embodiments of the present invention.

[0041] Figure 20 The three-dimensional schematic diagram of the bone conduction oscillator in some embodiments of the present invention when the housing assembly is not shown. In the figure, each suspended portion of the shrapnel has a hole.

[0042] Figure 21 The three-dimensional schematic diagram of the reset assembly in some embodiments of the present invention. In the figure, each suspended portion of the shrapnel has two holes.

[0043] Figure 22 The three-dimensional schematic diagram of the reset assembly in some embodiments of the present invention. In the figure, each suspended portion of the shrapnel has four holes.

[0044] Figure 23 The top view schematic diagram of the reset assembly in some embodiments of the present invention. In the figure, each suspended portion of the shrapnel has two grooves.

[0045] Figure 24 The three-dimensional schematic diagram of the bone conduction oscillator in some embodiments of the present invention.

[0046] Figure 25 is Figure 24 The exploded view of the bone conduction oscillator shown.

[0047] Figure 26 is Figure 24 The three-dimensional schematic diagram of the bone conduction oscillator shown. In the figure, the housing assembly is separated.

[0048] Figure 27 is Figure 24 The schematic diagram of the outer bracket and the magnetic conductive plate of the bone conduction oscillator shown being connected.

[0049] Figure 28 is Figure 24 The schematic diagram when the two outer brackets of the bone conduction oscillator shown are connected in a ring shape.

[0050] Figure 29 is a three-dimensional schematic diagram of a bone conduction oscillator in some embodiments of the present invention. In the figure, the housing assembly is separated.

[0051] Figure 30 is Figure 29 a cross-sectional schematic diagram of the bone conduction oscillator shown.

[0052] Figure 31 is Figure 30 a schematic diagram when the coil in the bone conduction oscillator is connected to the connecting plate.

[0053] Figure 32 is a three-dimensional schematic diagram of a bone conduction oscillator in some embodiments of the present invention when the housing assembly is not shown. In the figure, the reset assembly includes two elastic pieces.

[0054] Figure 33 is a three-dimensional schematic diagram of a bone conduction oscillator in some embodiments of the present invention. In the figure, the housing assembly is separated.

[0055] Figure 34 is Figure 33 a cross-sectional schematic diagram of the bone conduction oscillator shown.

[0056] Figure 35 is a three-dimensional schematic diagram of a bone conduction oscillator in some embodiments of the present invention. In the figure, the housing assembly is separated.

[0057] Figure 36 is Figure 35 a cross-sectional schematic diagram of half of the bone conduction oscillator shown, and the other half is symmetric to it.

[0058] Figure 37 is a cross-sectional schematic diagram of a bone conduction oscillator in some embodiments of the present invention.

[0059] Figure 38 is a three-dimensional schematic diagram of a bone conduction oscillator in some embodiments of the present invention when the housing assembly is not shown. In the figure, each suspended portion of the elastic piece has a hole.

[0060] Figure 39 is a three-dimensional schematic diagram of an elastic piece in some embodiments of the present invention. In the figure, each suspended portion of the elastic piece has a hole.

[0061] Figure 40 is a three-dimensional schematic diagram of an elastic piece in some embodiments of the present invention. In the figure, each suspended portion of the elastic piece has a hole.

[0062] Figure 41 is a three-dimensional schematic diagram of an elastic piece in some embodiments of the present invention. In the figure, each suspended portion of the elastic piece has two holes.

[0063] Figure 42Is a three-dimensional schematic diagram of the elastic sheet in some embodiments of the present invention. In the figure, each suspended portion of the elastic sheet has three holes.

[0064] Figure 43 Is a three-dimensional schematic diagram of the elastic sheet in some embodiments of the present invention. In the figure, each suspended portion of the elastic sheet has six holes.

[0065] Figure 44 Is a three-dimensional schematic diagram of the elastic sheet in some embodiments of the present invention. In the figure, each suspended portion of the elastic sheet has six holes.

[0066] Figure 45 Is a three-dimensional schematic diagram of the bone conduction oscillator in some embodiments of the present invention. In the figure, the housing assembly and the spacer are separated.

[0067] Figure 46 Is Figure 45 The cross-sectional schematic diagram of the bone conduction oscillator shown.

[0068] Figure 47 Is a cross-sectional schematic diagram of the bone conduction oscillator in some embodiments of the present invention.

[0069] Figure 48 Is a cross-sectional schematic diagram of the bone conduction oscillator in some embodiments of the present invention.

[0070] Figure 49 Is a cross-sectional schematic diagram of the bone conduction oscillator in some embodiments of the present invention. Detailed implementation manners

[0071] To make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe the detailed implementation manners of the present application with reference to the accompanying drawings. It can be understood that the specific embodiments described herein are only used to explain the present application, rather than limiting the present application. Additionally, it should be noted that for the sake of convenience of description, only the parts related to the present application are shown in the drawings, rather than all the structures. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0072] The terms "including" and "having" in the present application and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include steps or units not listed, or may optionally further include other steps or units inherent to these processes, methods, products, or devices.

[0073] Reference to "embodiments" in this document means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment each time, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0074] Some embodiments of the present invention propose a bone conduction oscillator, such as Figures 1 to 3 As shown, it includes main components such as a housing assembly 1, a permanent magnet magnetic circuit system 2, a coil 3, a magnetic conduction plate assembly 4, and a reset assembly 5. Among them, the permanent magnet magnetic circuit system 2, the coil 3, the magnetic conduction plate assembly 4, and the reset assembly 5 are all located inside the housing assembly 1.

[0075] As Figure 3 As shown, the permanent magnet magnetic circuit system 2 includes two groups of magnet assemblies 21. Each group of magnet assemblies 21 includes two magnets 210 arranged with opposite poles facing each other. Arranging with opposite poles facing each other means that the poles of the two magnets 210 facing each other are opposite. For example, Figure 3 In the illustrated embodiment, the two opposite poles of the upper magnet 210 and the lower magnet 210 are the S pole and the N pole respectively. It can be understood that the polarities can also be set conversely. Optionally, the two groups of magnet assemblies 21 are arranged at intervals along the length direction of the magnetic conduction plate assembly 4 to reduce the magnetic force interference between two adjacent magnets in the length direction.

[0076] In some embodiments, the number of coils 3 is two. As Figure 3 As shown, the two coils 3 are respectively located on both sides of the permanent magnet magnetic circuit system 2. Specifically, the two coils 3 and the permanent magnet magnetic circuit system 2 are arranged at intervals along the length direction of the magnetic conduction plate assembly 4, and the permanent magnet magnetic circuit system 2 is located between the two coils 3.

[0077] The magnetic conduction plate assembly 4 includes two magnetic conduction plates 40 respectively passing through the two coils 3. The magnetic conduction plate 40 extends between the two magnets 210 of the magnet assembly 21 adjacent to the coil through which it passes, and the adjacent ends of the two magnetic conduction plates 40 are not directly magnetically connected, that is, they do not directly contact or are not directly connected through a magnetic conduction material, so that the magnetic field circuits generated by the two coils 3 are separated independently to avoid mutual interference or magnetic short circuit. When the coil 3 is energized, the two coils 3 simultaneously polarize the parts of the two magnetic conduction plates 40 located between the two coils 3 into the same polarity. Specifically, the ends (inner ends) of the magnetic conduction plate 40 located inside the magnet assembly 21 are all polarized into the N pole or all polarized into the S pole, so as to generate an attractive force or a repulsive force with the magnet 210. For example, Figure 4In the illustrated example, the end of the left magnetic conductive plate 40 located inside the magnet assembly 21 is polarized as the N pole. At this time, it is attracted by the upper magnet 210 and repelled by the lower magnet 210, that is, the magnetic conductive plate 40 is subjected to an upward magnetic force, and the permanent magnet magnetic circuit system 2 is subjected to a downward magnetic force. Since the magnetic conductive plate 40 is relatively fixed to the housing assembly 1, therefore, the permanent magnet magnetic circuit system 2 will move downward relative to the magnetic conductive plate 40. When the polarity of the inner end of the magnetic conductive plate 40 changes to the S pole, the permanent magnet magnetic circuit system 2 will move upward relative to the magnetic conductive plate 40.

[0078] It can be understood that when alternating current is synchronously applied to the two coils 3, so that the direction of the magnetic force between the two magnetic conductive plates 40 and the corresponding magnet assemblies 21 is always the same at the same moment, the permanent magnet magnetic circuit system 2 will move as a whole in the same direction relative to the magnetic conductive plate assembly 4, thereby generating reciprocating vibration to achieve bone conduction sound transmission.

[0079] The reset assembly 5 is connected between the magnetic conductive plate assembly 4 and the permanent magnet magnetic circuit system 2, which enables a relative displacement to occur between the magnetic conductive plate assembly 4 and the permanent magnet magnetic circuit system 2, and when the magnetic conductive plate assembly 4 or the permanent magnet magnetic circuit system 2 deviates from the initial position, it can provide a reset force to drive the magnetic conductive plate assembly 4 or the permanent magnet magnetic circuit system 2 back to the initial position. The initial position refers to the positions of the magnetic conductive plate assembly 4 and the permanent magnet magnetic circuit system 2 when the bone conduction oscillator is not powered on. Usually, in the initial position, the magnetic conductive plate assembly 4 is centrally arranged between the two magnets of the magnet assembly 21 in the vibration direction. In some embodiments, the reset assembly 5 includes a spring piece 50 for providing elastic force, and the magnetic conductive plate assembly 4 or the permanent magnet magnetic circuit system 2 is reset by the elastic force of the spring piece 50.

[0080] It can be understood that since there are two sets of magnet assemblies 21 and two coils 3, therefore, the bone conduction oscillator will generate a greater driving force, and both its sensitivity and the loudness of the sound can be improved, thereby enhancing the listening effect. In addition, by using the spring piece 50 to provide the reset force, the overall stiffness coefficient (K value) can be made smaller, which is beneficial to reducing the low-frequency resonance frequency (low-frequency F0) of the vibration system, making the low-frequency sensitivity higher and the bass effect better.

[0081] It can be understood that by fixing the magnetic conductive plate assembly 4 or fixing the permanent magnet magnetic circuit system 2, the vibrating part during the operation of the bone conduction oscillator can be changed.

[0082] In some embodiments, Figure 3 and Figure 19Taking the structure shown as an example, the magnetic conduction plate assembly 4 and the housing assembly 1 are relatively fixed. At this time, when the bone conduction oscillator works, the permanent magnet magnetic circuit system 2 will vibrate relative to the housing assembly 1. Since the mass of the permanent magnet magnetic circuit system 2 is relatively large, it can provide a greater sense of vibration and is beneficial to further reduce the low-frequency F0 and improve the low-frequency acoustic performance. It can be understood that when the coil 3 and the permanent magnet magnetic circuit system 2 are relatively fixed (for example Figure 3 the embodiment shown), when the two move synchronously, the mass of the vibrating part of the bone conduction oscillator will be further increased, thereby further improving the low-frequency sound generation effect. When the coil 3 and the reset assembly 5 are relatively fixed (for example Figure 19 the embodiment shown), since the mass of the vibrating part is relatively reduced, it is beneficial to improve the response speed of the vibration and the overall sensitivity, so as to facilitate achieving a better balance between improving the low-frequency effect and the response speed.

[0083] In some embodiments, taking Figures 46 to 49 the structure shown as an example, the permanent magnet magnetic circuit system 2 and the housing assembly 1 are relatively fixed. At this time, when the bone conduction oscillator works, the magnetic conduction plate assembly 4 will vibrate relative to the housing assembly 1. Since the mass of the magnetic conduction plate assembly 4 is usually smaller than that of the permanent magnet magnetic circuit system 2, the response of the magnetic conduction plate assembly 4 to the electrical signal of the coil 3 is usually faster, which is beneficial to improving the overall sensitivity. It can be understood that by fixing the coil 3 and the reset assembly 5 relatively (for example Figure 48 and Figure 49 the embodiments shown), when the two move synchronously, the mass of the vibrating part of the bone conduction oscillator can be increased, thereby facilitating achieving a better balance between improving the low-frequency effect and the response speed.

[0084] In this article, the vibration direction of the bone conduction oscillator is the vibration direction of the permanent magnet magnetic circuit system 2 or the magnetic conduction plate assembly 4 during operation, which is consistent with the thickness direction of the magnetic conduction plate 40 and the magnetic conduction plate assembly 4, which can reduce the thickness of the bone conduction oscillator and increase the relative area of the magnetic conduction plate 40 and the magnet 210, thereby increasing the driving force.

[0085] In the embodiments of this specification, the length directions of the magnetic conduction plate 40, the magnetic conduction plate assembly 4, and the bone conduction oscillator are also the same.

[0086] It can be understood that in order to enable the vibrating part of the bone conduction oscillator to vibrate reliably, there is a vibration space between the vibrating part that vibrates during the operation of the bone conduction oscillator and the stationary fixed part in the vibration direction, so as to prevent the fixed part from hindering the movement of the vibrating part. As Figure 5 shown, Figure 5 shows Figure 3A part of the structure shown has a first spacing D1 between the inner wall of the coil 3 and the magnetic conduction plate 40, a second spacing D2 between the magnet 210 and the magnetic conduction plate 40, a third spacing D3 between the elastic sheet 50 and the housing assembly 1, and a fourth spacing D4 between the elastic sheet 50 and the coil 3 in the vibration direction to provide a vibration space. Optionally, the first spacing D1, the third spacing D3, and the fourth spacing D4 are all greater than the second spacing D2, and the distance between the magnetic conduction plate 40 and the magnet 210 is relatively closer, which is beneficial to increasing the driving force, accelerating the vibration response, and at the same time is beneficial to avoiding noise generated by the impact of other parts during vibration.

[0087] Next, relevant content of the housing assembly 1 will be illustrated by examples.

[0088] In some embodiments, the housing assembly 1 is formed by connecting multiple shells. Herein, the meaning of multiple is two or more. As Figure 1 and Figure 2 shown, the housing assembly 1 includes a first shell 10 and a second shell 11. Both the first shell 10 and the second shell 11 include a substrate 100 and a frame 101 protruding from the outer edge of the substrate 100. The first shell 10 and the second shell 11 are connected through the frame 101. The frame 101 is annular.

[0089] In the illustrated embodiment, the housing assembly 1 is in the shape of a cuboid as a whole.

[0090] In some embodiments, the housing assembly 1 is made of a magnetic conduction material. The magnetic field generated by the energization of the coil 3 forms a magnetic circuit through the housing assembly 1 to increase the utilization of the magnetic field, and can polarize the magnetic conduction plate 40 more efficiently to improve the driving force.

[0091] As Figure 4 shown, Figure 4 in the illustrated embodiment, both ends of the magnetic conduction plate assembly 4 are connected to the housing assembly 1. After the coil 3 is energized, the magnetic induction lines emit from the end of the magnetic conduction plate 40 located inside the magnet assembly 21, pass through the magnet 210, the yoke iron assembly 22, the substrate 100 and the frame 101 of the housing assembly 1, and then return to the outer end of the magnetic conduction plate 40 (i.e., the end of the magnetic conduction plate 40 close to the frame 101) to form a magnetic circuit. Figure 4 The schematic diagram of the magnetic circuit is shown by the dotted line with arrows in. It can be understood that when the inner end of the magnetic conduction plate 40 is polarized into the S pole, the direction of the magnetic induction lines is opposite.

[0092] As Figure 36 shown, Figure 36 in the illustrated embodiment, both ends of the magnetic conduction plate assembly 4 are spaced from the housing assembly 1. After the coil 3 is energized, the magnetic induction lines emit from the end of the magnetic conduction plate 40 located inside the magnet assembly 21, pass through the magnet 210, the yoke iron 220, the substrate 100 and the frame 101 of the housing assembly 1, and then return to the outer end of the magnetic conduction plate 40 to form a magnetic circuit.Figure 36 The schematic diagram of the magnetic circuit is shown by a dotted line with an arrow. It can be understood that when the inner end of the magnetic conduction plate 40 is polarized into the S pole, the direction of the magnetic induction line is opposite.

[0093] Optionally, in the thickness direction of the magnetic conduction plate assembly 4, the distance L1 between the yoke assembly 22 and the inner wall of the housing assembly 1 (specifically, the inner wall of the substrate 100) does not exceed 1 mm. In the length direction of the magnetic conduction plate assembly 4, the distance L2 between the magnetic conduction plate 40 and the inner wall of the housing assembly 1 (specifically, the inner wall of the frame 101) does not exceed 1 mm, so that the magnetic conduction material can efficiently guide the magnetic induction lines to form a loop. Further optionally, the distance L1 does not exceed 0.6 mm, and the distance L2 does not exceed 0.6 mm to further improve the efficiency of forming the magnetic circuit.

[0094] Next, the related content of the permanent magnet magnetic circuit system 2 will be illustrated by examples.

[0095] As Figure 3 shown, the two magnets 210 of the magnet assembly 21 are respectively located on both sides of the magnetic conduction plate 40 in the thickness direction, so that the magnet 210 is disposed opposite to the surface in the thickness direction of the magnetic conduction plate 40 (i.e., the upper surface or the lower surface). Since the area of the surface in the thickness direction is relatively larger and the distance between the two opposite magnets 210 is relatively smaller, it is beneficial to increase the driving force.

[0096] In some embodiments, the magnetization directions of the two magnet assemblies 21 are the same, that is, the arrangement directions of the magnetic poles of the magnets 210 are the same, and they are all arranged along the thickness direction of the magnetic conduction plate 40, and the arrangement orders of the two magnetic poles are also the same. For example, Figure 4 in the illustrated embodiment, the two magnetic poles of the magnet 210 are both arranged along the thickness direction, and both are N poles on the upper side and S poles on the lower side. The directions of the magnetic fields generated by the two coils 3 at the same moment are opposite, so that the polarities of the ends of the two magnetic conduction plates 40 in the magnet assembly 21 are the same at the same moment. Since the magnetization directions of all the magnets 210 are the same, it is more convenient to magnetize. It can be understood that in other embodiments, the magnetization directions of the two magnet assemblies 21 can also be opposite. At this time, the directions of the magnetic fields generated by the two coils 3 at the same moment are the same, so that the polarities of the ends of the two magnetic conduction plates 40 in the magnet assembly 21 are opposite at the same moment. In some embodiments, the two coils 3 are connected in series to ensure the synchronism of the generated magnetic fields.

[0097] As Figure 3 、 Figure 6 and Figure 7 shown, the permanent magnet magnetic circuit system 2 includes a yoke assembly 22. The yoke assembly 22 is provided with a channel 221 penetrating along the length direction of the magnetic conduction plate 40. The two magnets 210 of the magnet assembly 21 are both connected to the inner surface 22a of the yoke assembly 22.

[0098] In some embodiments, as Figure 3 shown, two sets of magnet assemblies 21 share one set of yoke assemblies 22, and the two sets of magnet assemblies 21 are arranged in the channels 221 of the same yoke assembly 22. This is beneficial to improving the compactness of the structure, enabling the permanent magnet magnetic circuit system 2 to be assembled as a whole for installation, which is more convenient for installation, and at the same time can increase the mass of the permanent magnet magnetic circuit system 2.

[0099] In some embodiments, as Figure 8 shown, each set of magnet assemblies 21 has a corresponding set of yoke assemblies 22, the two sets of magnet assemblies 21 are respectively arranged in the channels 221 of the two sets of yoke assemblies 22, and the two sets of yoke assemblies 22 are arranged at intervals along the length direction of the magnetic conduction plate assembly 4. Optionally, the two sets of yoke assemblies 22 are both connected to the same elastic piece 50, so as to be assembled as a whole through the elastic piece 50 for installation, which is convenient to ensure the relative positions of the two sets of yoke assemblies 22.

[0100] In some embodiments, the yoke assembly 22 is formed by connecting a plurality of yokes 220. Figure 9 In the illustrated embodiment, the yoke assembly 22 includes two yokes 220. Both of the two yokes 220 include a bottom plate 2200 and side plates 2201 protruding from both sides of the bottom plate 2200. The two yokes 220 are connected through the side plates 2201, and the two magnets 210 of the magnet assembly 21 are respectively connected to the bottom plates 2200 of the two yokes 220. The magnet assembly 21 can form a magnetic circuit through the yoke assembly 22, improve the magnetic field utilization rate, and increase the driving force. Figure 7 In, the magnetic circuit of the magnet assembly 21 is schematically shown by a dotted line with an arrow. The magnetic induction lines emitted from the N pole of the upper magnet 210 sequentially pass through the upper bottom plate 2200, the upper side plate 2201, the lower side plate 2201 and the lower bottom plate 2200 and then enter the S pole of the lower magnet 210. The magnetic induction lines emitted from the N pole of the lower magnet 210 enter the S pole of the upper magnet 210 from the air gap, thereby forming a closed loop.

[0101] In some embodiments, as Figure 10 shown, the outer side surface 220a of the yoke assembly 22 is flush with the outer side surface 210b of the adjacent magnet 210. The outer side surface refers to the side surfaces of the yoke assembly 22 and the magnet 210 close to the bone conduction oscillator. In this way, the yoke assembly 22 and the magnet 210 can be fully utilized, the compactness of the structure can be improved, and the size in the length direction of the bone conduction oscillator can be reduced.

[0102] Next, the relevant content of the magnetic conduction plate assembly 4 will be illustrated by examples.

[0103] The magnetic conduction plate assembly 4 is integrally strip-shaped, its length is greater than its width, and its width is greater than its thickness.

[0104] In some embodiments, asFigure 11 As shown, two magnetic conductive plates 40 are spaced apart, and a spaced space 42 is formed therebetween. Optionally, the two magnetic conductive plates 40 are spaced apart along the length direction of the magnetic conductive plate assembly 4. As a feasible example, the portion of the magnetic conductive plate 40 located within the magnet assembly 21 is suspended, and the magnetic conductive plate 40 is fixedly connected to the housing assembly 1 so that the magnetic conductive plate 40 can remain relatively fixed with respect to the housing assembly 1 and is not easily tilted or displaced under the action of magnetic force. It can be understood that the stiffness of the magnetic conductive plate 40 can be increased so that it can maintain a horizontal state and reduce the vibration at its inner end. As another feasible example, the portion located within the magnet assembly 21 can be connected to the housing assembly 1 through a connecting member (not shown in the figure) to improve its stability.

[0105] In some embodiments, as Figure 12 As shown, two magnetic conductive plates 40 are spaced apart and connected by a connecting block 43. In this way, the inner ends of the magnetic conductive plates 40 located within the magnet assembly 21 can be supported, and the overall structural strength of the magnetic conductive plate assembly 4 is better, which is beneficial to ensuring the stability of the vibration of the bone conduction oscillator. At the same time, the magnetic conductive plate assembly 4 can be installed as a whole, which is more convenient for installation. Optionally, the two magnetic conductive plates 40 are spaced apart along the length direction of the magnetic conductive plate assembly 4.

[0106] Optionally, the surfaces of the two magnetic conductive plates 40 in the vibration direction are flush (that is, the upper surfaces of the two magnetic conductive plates 40 are flush, and the lower surfaces of the two magnetic conductive plates 40 are flush), so as to make full use of the space and ensure the consistency of the width of the magnetic gap between the magnetic conductive plate 40 and the magnet 210.

[0107] Optionally, the surfaces of the magnetic conductive plate 40 and the connecting block 43 in the vibration direction are flush (that is, the upper surface of the magnetic conductive plate 40 is flush with the upper surface of the connecting block 43, and the lower surface of the magnetic conductive plate 40 is flush with the lower surface of the connecting block 43). In this way, there is a large contact area between the magnetic conductive plate 40 and the connecting block 43, the connection strength is good, and the connecting block 43 does not protrude from the outer surface of the magnetic conductive plate 40, which is beneficial to preventing the connecting block 43 from hitting the magnet 210 during vibration and generating noise or causing damage. Further optionally, both the magnetic conductive plate 40 and the connecting block 43 have the same wall thickness, and the wall thickness is the same everywhere.

[0108] The connecting block 43 is made of a non-magnetic conductive material, and its material can be, for example, stainless steel, copper, aluminum or ceramic, etc. It can be connected to the magnetic conductive plate 40 by, for example, gluing or welding.

[0109] In some embodiments, as Figure 13As shown, two magnetic conductive plates 40 are arranged at intervals and connected by a gasket 44. The gasket 44 is made of a non-magnetic conductive material and is connected to the surface of the magnetic conductive plate 40 facing the magnet 210 (i.e., the surface in the thickness direction), so as to increase the structural strength of the magnetic conductive plate assembly 4 and the stability of the vibration of the bone conduction oscillator. Optionally, gaskets 44 are provided on both surfaces of the magnetic conductive plate 40 in the thickness direction to improve the connection strength. Optionally, the two magnetic conductive plates 40 are arranged at intervals along the length direction of the magnetic conductive plate assembly 4. In some embodiments, the gasket 44 extends between the magnetic conductive plate 40 and the magnet 210, so that the gasket 44 can protect the magnet 210 and the magnetic conductive plate 40, and is beneficial to preventing the magnetic conductive plate 40 and the magnet 210 from being attracted and stuck due to contact. Optionally, the gasket 44 is made of a hard material, and its hardness is less than that of the magnetic conductive plate 40. For example, it can be made of stainless steel, copper, aluminum or plastic. When the magnet 210 moves with a large displacement towards the magnetic conductive plate 40, the magnet 210 will contact the gasket 44 instead of the magnetic conductive plate 40, thus playing a protective role.

[0110] In some embodiments, a connecting block 43 and a gasket 44 are simultaneously arranged between the two magnetic conductive plates 40. The gasket 44 is at least partially located between the magnetic conductive plate 40 and the magnet 210 and is made of a non-magnetic conductive material to prevent the magnetic conductive plate 40 and the magnet 210 from being attracted and stuck due to contact, and its hardness is less than that of the magnetic conductive plate 40 to improve the anti-collision effect. As Figure 5 and Figure 14 shown, the gasket 44 connects the connecting block 43 and the two magnetic conductive plates 40, which can further improve the connection strength and can play a protective role through the gasket 44. When the connecting block 43 is provided, the gasket 44 can be made of a flexible material with a hardness less than that of the magnetic conductive plate 40 to make its anti-collision effect better. The flexible material can be rubber, etc.

[0111] Optionally, referring to Figure 5 , the length L3 of the part of the gasket 44 located between the magnet 210 and the magnetic conductive plate 40 is not less than one-third of the length L4 of the magnet 210, so that it can reliably play an anti-collision effect and obtain better connection strength.

[0112] Optionally, in the above embodiments, the spacing distance L5 between the two magnetic conductive plates 40 is not less than 0.2 mm to reduce the mutual interference of the magnetic fields after the two magnetic conductive plates 40 are polarized. Further optionally, the spacing distance L5 does not exceed 1 mm so that the overall length of the bone conduction oscillator is not too large. Optionally, the distance between two adjacent magnets 210 in the length direction is not less than 0.2 mm to reduce the magnetic field interference between the two magnets 210. Further optionally, it does not exceed 1 mm to reduce the volume of the product. Further optionally, the distance between two adjacent magnets 210 in the length direction is the same as the spacing distance L5 between the two magnetic conductive plates 40.

[0113] In some embodiments, the magnetic conduction plate assembly 4 is relatively fixed to the housing assembly 1.

[0114] As a feasible example, both ends of the magnetic conduction plate assembly 4 are fixedly connected to the housing assembly 1. Exemplarily, as Figures 1 to 3 shown, both ends of the magnetic conduction plate assembly 4 (i.e., the ends of the magnetic conduction plate 40 close to the housing assembly 1) are clamped between the first housing 10 and the second housing 11. The first housing 10 and the second housing 11 are both provided with mounting grooves 102 adapted to the ends of the magnetic conduction plate 40. The mounting grooves 102 on the two housings cooperate to accommodate the magnetic conduction plate 40. In other embodiments, only one housing may be provided with a mounting groove 102 adapted to the magnetic conduction plate 40.

[0115] As another feasible example, as Figures 24 to 28 shown, the magnetic conduction plate assembly 4 includes two outer frame bodies 41 respectively connected to the two magnetic conduction plates 40. The outer frame body 41 is generally U-shaped, and its shape after being connected to the magnetic conduction plate 40 is generally E-shaped. Specifically, the outer frame body 41 includes a middle portion 410 and side arms 411 connected to both ends of the middle portion 410. The extending directions of the two side arms 411 are the same. The magnetic conduction plate 40 is connected to the middle portion 410 and is located between the two side arms 411. The outer frame body 41 is clamped between the first housing 10 and the second housing 11 so that the magnetic conduction plate assembly 4 is fixedly connected to the housing assembly 1. Optionally, the outer frame body 41 and the magnetic conduction plate 40 are integrally formed. In some instances, the two outer frame bodies 41 are spaced apart and do not contact each other. In other instances, as Figure 28 shown, the side arms 411 of the two outer frame bodies 41 are connected to form a ring. Optionally, the outer surface of the outer frame body 41 is flush with the outer surface of the housing assembly 1, which is convenient for positioning and assembly.

[0116] As yet another feasible example, as Figure 33 and Figure 34 shown, both ends of the magnetic conduction plate assembly 4 are connected to the housing assembly 1 through a connecting plate 53 to realize the relative fixation of the magnetic conduction plate assembly 4 and the housing assembly 1.

[0117] As yet another feasible example, as Figures 35 to 37 shown, both ends of the magnetic conduction plate assembly 4 are connected to the housing assembly 1 through support pads 6 to realize the relative fixation of the magnetic conduction plate assembly 4 and the housing assembly 1.

[0118] In some embodiments, as Figure 10As shown, the inner side surface 40b of the magnetic conduction plate 40 is flush with the inner side surface 210a of the adjacent magnet 210, so as to make full use of the magnet 210 and reduce the mutual interference of the magnetic fields between the two magnetic conduction plates 40 after being polarized. For example, if the magnetic conduction plate 40 retracts inside the inner side surface 210a of the magnet 210, the utilization rate of the magnetic field of the magnet 210 will decrease; if the magnetic conduction plate 40 protrudes outside the inner side surface 210a of the magnet 210, the two magnetic conduction plates 40 are likely to be too close to each other, and a large repulsive force is likely to be formed between them, which is not conducive to the stability of the structure. If the distance between the two magnetic conduction plates 40 is ensured, the volume of the housing assembly 1 will increase, or the volume of the magnet 210 will be reduced, reducing the driving force. The inner side surface refers to the side surface of the magnetic conduction plate 40 and the magnet 210 that is relatively far from the end of the housing assembly 1.

[0119] Next, relevant content of the reset assembly 5 will be illustrated by examples.

[0120] The reset assembly 5 is located on one side of the vibration direction of the magnetic conduction plate assembly 4 to provide an elastic force along the vibration direction. There can be various connection methods between the reset assembly 5, the permanent magnet magnetic circuit system 2, and the magnetic conduction plate assembly 4, which will be illustrated by examples below.

[0121] In some embodiments where the reset assembly 5 is connected to the permanent magnet magnetic circuit system 2 and the magnetic conduction plate assembly 4, as Figure 15 and Figure 16 shown, the reset assembly 5 includes two fixing pieces 51 located at both ends thereof and a connecting piece 52 connected between the elastic piece 50 and the fixing pieces 51. The elastic piece 50 and the permanent magnet magnetic circuit system 2 are connected to the outer surface 2a that is away from the magnetic conduction plate 40 in the vibration direction (in the figure, this outer surface is the outer surface of the yoke iron assembly 22), and the two fixing pieces 51 are respectively located on both sides of the two coils 3 along the length direction of the magnetic conduction plate assembly 4 and are connected to the magnetic conduction plate 40. The elastic piece 50 has a first fixing portion 500 connected to the permanent magnet magnetic circuit system 2 in the middle thereof and a suspended portion 501 located between the first fixing portion 500 and the connecting piece 52. The reset assembly 5 mainly provides a reset force through the elastic deformation of the suspended portion 501, and there is a vibration space between the suspended portion 501 of the elastic piece 50 and the coil 3.

[0122] Optionally, the elastic piece 50, the connecting piece 52, and the fixing pieces 51 are integrally formed, for example, by integrally bending a metal sheet, so as to reduce the number of overall components, facilitate assembly, and improve assembly accuracy.

[0123] Optionally, the fixing piece 51 is connected to the surface 40a of the magnetic conduction plate 40 facing the elastic piece 50, and the connecting piece 52 is arranged parallel to the vibration direction and perpendicular to the elastic piece 50 and the fixing pieces 51. The supporting performance of the connecting piece 52 can be improved, and a more sufficient space for accommodating the coil 3 can be provided. When the coil 3 is connected to the connecting piece 52, it is also convenient for the installation of the coil 3 and improves the connection strength.

[0124] In some embodiments where the reset assembly 5 is connected to the permanent magnet magnetic circuit system 2 and the magnetic conductive plate assembly 4, as Figures 29 to 32 shown, the elastic piece 50 and the permanent magnet magnetic circuit system 2 are connected to the outer surface 2a of the magnetic conductive plate 40 facing away from the vibration direction (in the figure, this outer surface is the outer surface of the yoke assembly 22). Its two ends extend along the length direction of the magnetic conductive plate assembly 4 to exceed the permanent magnet magnetic circuit system 2, and extend towards the sides where the two coils 3 are located respectively. The reset assembly 5 and its elastic piece 50 extend in the length direction of the magnetic conductive plate assembly 4 to exceed the two ends of the two coils 3. The reset assembly 5 includes two connecting plates 53 respectively located at the two ends of the two coils 3 along the length direction of the magnetic conductive plate assembly 4. The connecting plates 53 are connected between the elastic piece 50 and the magnetic conductive plate 40. The part of the elastic piece 50 connected to the permanent magnet magnetic circuit system 2 is its first fixing portion 500, the part connected to the connecting plate 53 is its second fixing portion 502, and the part located between the first fixing portion 500 and the second fixing portion 502 is its suspended portion 501. The reset assembly 5 mainly provides a reset force through the elastic deformation of the suspended portion 501. The suspended portion 501 of the elastic piece 50 is disposed opposite to the coil 3, and there is a vibration space between the two.

[0125] The connecting plate 53 can be made of a magnetic conductive material or a non-magnetic conductive material.

[0126] Optionally, as Figure 30 and Figure 31 shown, the connecting plate 53 is connected to the surface 40a of the magnetic conductive plate 40 facing the elastic piece 50, and the elastic piece 50 is connected to the surface of the connecting plate 53 facing away from the magnetic conductive plate 40 for easy fixing. The connecting plate 53 is arranged parallel to the vibration direction and perpendicular to the elastic piece 50.

[0127] Optionally, the elastic piece 50 is in a flat sheet shape, and its thickness direction is consistent with the vibration direction of the bone conduction oscillator, so as to facilitate elastic deformation along the vibration direction, and the deformation amplitudes on the upper and lower sides are more consistent, and at the same time, the space in the thickness direction of the bone conduction oscillator can be saved.

[0128] In some embodiments, as Figure 3 and Figure 30 shown, the bone conduction oscillator includes two sets of reset assemblies 5, and the two sets of reset assemblies 5 are symmetrically arranged on both sides of the magnetic conductive plate assembly 4 in the thickness direction, so that when the bone conduction oscillator works, the vibration of the vibrating part is more stable and the linearity is better.

[0129] In some embodiments, the bone conduction oscillator includes two sets of reset assemblies 5, and the elastic pieces 50 of the two sets of reset assemblies 5 are symmetrically arranged, and the structures of the connecting plates 53 of the two sets of reset assemblies 5 are different. As Figure 33 and Figure 34As shown, two connecting plates 53 located on the same side (the lower side in the figure) in the thickness direction of the magnetic conduction plate 40 are connected to the housing assembly 1, so that the magnetic conduction plate 40 and the housing assembly 1 are relatively fixed. The connecting plate 53 connected to the housing assembly 1 is provided with an outwardly protruding support foot 530, and the support foot 530 is connected to the housing assembly 1. Optionally, the support foot 530 is connected to the inner wall 100a of the substrate 100 of the housing assembly 1. The number of support feet 530 provided on a single connecting plate 53 is two. The magnetic conduction plate 40 is located between the two support feet 530 and is positioned by the two support feet 430. The support foot 530 extends along the thickness direction of the magnetic conduction plate 40 and contacts the inner wall of the housing assembly 1.

[0130] It can be understood that the connecting plates 53 of the two groups of reset components 5 can also be set to have the structure with support feet 530. At this time, the two groups of reset components 5 are symmetrical.

[0131] In some embodiments, the bone conduction oscillator includes two groups of reset components 5, and the two groups of reset components 5 are symmetrically arranged. For example Figure 3 、 Figure 35 and Figure 36 as shown. Figure 35 and Figure 36 In the structures shown in and, the reset component 5 and the housing assembly 1 are connected by a support cushion block 6. The connecting plate 53 is generally rectangular. The support cushion block 6 is correspondingly arranged with the connecting plate 53 and is connected between the end (the second fixing part 502) of the elastic piece 50 and the substrate 100 of the housing assembly 1, so that the reset component 5 and the housing assembly 1 are relatively fixed. Optionally, a support cushion block 6 is arranged on one side of the magnetic conduction plate assembly 4 in the vibration direction, and support cushion blocks 6 are arranged at both ends of the reset component 5 to improve the support performance and facilitate assembly. Of course, support cushion blocks 6 can also be arranged at both ends of the two groups of reset components 5 to further improve the support performance.

[0132] The support cushion block 6 can be made of a magnetic conduction material or a non-magnetic conduction material.

[0133] Optionally, when the magnetic conductive plate assembly 4 is connected to the shell assembly 1 through the connecting plate 53 or the supporting pad 6, the two ends of the magnetic conductive plate assembly 4 in the length direction are spaced from the shell assembly 1, and the two do not contact each other. In this way, there is no need to groove the shell assembly 1, which is conducive to simplifying the process and improving the sealing. Further optionally, the outer side surface of the magnetic conductive plate 40 is flush with the outer side surface of the connecting plate 53 for easy positioning, and the outer side surface refers to the side surface of the magnetic conductive plate 40 and the connecting plate 53 close to one end of the length direction of the shell assembly 1. As described above, in order to reliably form a magnetic circuit, optionally, the spacing L2 between the magnetic conductive plate assembly 4 and the shell assembly 1 along the length direction of the magnetic conductive plate assembly 4 does not exceed 1 mm. Of course, even if the magnetic conductive plate assembly 4 has been connected to the shell assembly 1 through the connecting plate 53, it can still be in contact with the shell assembly 1 or fixedly connected to the shell assembly 1 to further improve the connection strength and more reliably form a magnetic circuit.

[0134] It is understandable that the number of the spring pieces 50 included in the reset assembly 5 is not limited to one, and it may also include two or more spring pieces 50, all of which are connected to the outer surface of the permanent magnet magnetic circuit system 2 that is away from the magnetic plate 40 in the vibration direction of the bone conduction vibrator, and at least two spring pieces 50 extend toward the sides where the two coils 3 are located, so as to be connected to the two ends of the magnetic plate assembly 4 through the connecting piece 52 or the connecting plate 53 or other components. For example, Figure 17 , Figure 18 and Figure 32 In the embodiment shown, the reset assembly 5 includes two springs 50, one end of which is connected to the permanent magnetic circuit system 2, and the other end extends along the length direction of the magnetic plate assembly 4 toward the side where the coil 3 is located, so as to be connected to the connecting piece 52 or the connecting plate 53. The two springs 50 extend in opposite directions, and the two springs 50 extend toward the sides where the two coils 3 are located respectively. The reset assembly 5 extends in the length direction of the magnetic plate assembly 4 to exceed the two ends of the two coils 3, and is connected to the two ends of the magnetic plate assembly 4. It can be understood that Figure 3 For example, a single spring piece 50 extends out of the two ends of the permanent magnetic circuit system 2, which is conducive to increasing the contact area between the spring piece 50 and the permanent magnetic circuit system 2 and improving the connection effect. At the same time, the position accuracy of the spring piece 50 can be more accurately guaranteed, for example, there is no need to adjust the relative position of the two spring pieces 50, which is also conducive to reducing the number of parts and improving production efficiency.

[0135] It can be understood that the two ends of the magnetic plate assembly 4 extend beyond the two ends of the two coils 3, and the two ends of the reset assembly 5 are respectively connected to the two ends of the magnetic plate assembly 4 located outside the two coils 3, and the middle part is connected to the permanent magnet magnetic circuit system 2, which can make the force on the magnetic plate assembly 4 more symmetrical, more stable during vibration, and better in linearity.

[0136] Next, some examples will be given to illustrate the contents related to shrapnel.

[0137] It can be understood that since the thickness of the elastic piece 50 is smaller than that of the magnetic conductive plate 40, its stiffness coefficient is smaller, and the low-frequency resonance frequency of the bone conduction oscillator can be made lower, thereby improving the low-frequency effect. Further, the elastic piece 50 extends to be connected to the connecting plate 53 or the connecting piece 52 outside the coil 3, which can make full use of the space inside the housing assembly 1, increase the length of the suspended portion 501 of the elastic piece 50, thereby reducing the stiffness coefficient of the elastic piece 50 and improving the low-frequency effect. In addition, the suspended portion 501 of the elastic piece 50 does not need to be very thin in the width direction and is not easily damaged, which is beneficial to improving the reliability of the elastic piece in working.

[0138] It can be understood that when the elastic piece 50 is arranged in parallel with the magnetic conductive plate assembly 4, the width direction, length direction and thickness direction of the two are the same.

[0139] In some embodiments, the effective width B2 of at least part of the suspended portion 501 is smaller than the width B1 of the elastic piece 50. The effective width of the suspended portion 501 refers to the minimum width of the solid part of the suspended portion 501. Taking the Figure 20 illustrated embodiment as an example, the effective width is the sum of B20 and B21. Taking the Figure 23 illustrated embodiment as an example, the effective width B2 of the suspended portion 501 is the width at the narrowest part of the suspended portion 501. The smaller the effective width, the less material the suspended portion 501 has in the width direction. The width B1 of the elastic piece 50 refers to the width dimension at the widest part of its outer shape. By adjusting the effective width of the suspended portion 501, the stiffness coefficient of the elastic piece 50 can be adjusted. Setting the effective width B2 of the suspended portion 501 to be smaller than the width B1 of the elastic piece 50 can effectively reduce the stiffness coefficient of the elastic piece 50 and improve the low-frequency effect.

[0140] In some embodiments, the suspended portion 501 is provided with a hollow structure to reduce the effective width through the hollow structure. As some feasible examples, the hollow structure includes holes 503 that are not communicated with the side walls in the width direction of the elastic piece 50. Figures 20 to 22 and Figures 38 to 44 shows a schematic diagram when the hollow structure includes holes 503. In these embodiments, the effective width of the suspended portion 501 is smaller than its own width B4. As other feasible examples, as Figure 23 shown, the hollow structure includes grooves 504 that are communicated with the side wall 50a in the width direction of the elastic piece 50. In other examples, the hollow structure can include holes 503 and grooves 504 at the same time.

[0141] Optionally, the width of the suspended portion 501 is the same as the width of the portion of the elastic piece 50 in contact with the permanent magnet magnetic circuit system 2, so as to improve its anti-torsion ability, and further improve the stability and linearity of vibration. Optionally, the ratio of the width of the elastic piece 50 to the width of the permanent magnet magnetic circuit system 2 is not less than 0.3, so as to ensure the contact area with the permanent magnet magnetic circuit system 2, improve the contact effect, and at the same time further ensure the anti-torsion ability of the elastic piece 50. The width of the permanent magnet magnetic circuit system 2 is the width of the yoke iron assembly 22, referring to the width at its widest part. In this article, unless otherwise specified as "effective width", the "width" of an object refers to the width of its outer contour, and the hollowed-out part does not need to be removed. Further optionally, the elastic piece 50 has a uniform width.

[0142] It can be understood that by adjusting the number, area, shape, position, etc. of the adjustment holes 503 and grooves 504, the stiffness coefficient of the elastic piece 50 can be adjusted.

[0143] In some embodiments, such as Figure 20 , Figure 38 , Figure 39 and Figure 40 shown, the hollow structure of each suspended portion 501 includes a hole 503, and the shape of the hole 503 can be, for example, a rounded rectangle, an ellipse, etc. By adjusting the length, width and shape of the hole 503, the stiffness coefficient can be adjusted. Optionally, the hole 503 extends along the length direction of the elastic piece 50, and the length direction of the elastic piece 50 is the same as the length direction of the magnetic conductive plate assembly 4.

[0144] In some embodiments, the hollow structure includes at least two holes 503, and the at least two holes 503 are arranged at intervals along the length direction or the width direction of the elastic piece 50. As Figure 21 and Figure 41 shown, the hollow structure of each suspended portion 501 includes two holes, and the two holes 503 are arranged at intervals along the length direction of the elastic piece 50, and the shape of the holes can be a rounded rectangle, an ellipse, a trapezoid or a triangle, etc. Figure 42 In the illustrated embodiment, the hollow structure includes three holes 503 arranged at intervals along the length direction of the elastic piece 50, the shape of the holes is triangular, and they are arranged in a substantially rectangular shape. Figure 22 In the illustrated embodiment, the hollow structure includes four holes 503, and the four holes 503 are arranged in two rows and two columns. Figure 43 and Figure 44 shown, the hollow structure includes six holes 503, arranged in two rows and three columns.

[0145] It can be understood that the number of the above-mentioned holes refers to the number of holes in the hollow structure of a single suspended portion 501.

[0146] The shrapnel 50 and the permanent magnet magnetic circuit system 2 can be connected by gluing or welding. In some embodiments, the hollow structure extends at least partially to the outer surface of the permanent magnet magnetic circuit system 2, exposing the outer surface of the permanent magnet magnetic circuit system 2 to form a glue-containing space, thereby improving the connection strength of the glued connection.

[0147] In some embodiments, the shrapnel 50 is made of a magnetic conductive material, which is beneficial to guiding magnetic induction lines to form a loop and improving the magnetic conduction effect. Optionally, the shrapnel 50, the connecting piece 52, and the fixing piece 51 are all made of magnetic conductive materials, and the connecting plate 53 is also made of magnetic conductive materials. In some other embodiments, the shrapnel 50 is made of a non-magnetic conductive material. Optionally, the shrapnel 50 is a spring steel sheet, and further optionally, the shrapnel 50 is a stainless steel spring steel sheet.

[0148] Next, an example of the content related to the coil 3 will be given.

[0149] The number of coils 3 is two, and they are respectively located at both ends of the permanent magnet magnetic circuit system 2 along the length direction of the magnetic conductive plate assembly 4.

[0150] In some embodiments, the coil 3 is relatively fixed to the permanent magnet magnetic circuit system 2, such as Figure 15 , Figure 30 , Figure 36 and Figure 46 shown, the coil 3 is connected to the outer side surface 2b of the permanent magnet magnetic circuit system 2, and can be connected by gluing, for example. Optionally, the outer side surface 210b of the magnet 210 is flush with the outer side surface 220a of the yoke iron assembly 22, so that the contact area between the coil 3 and the outer side surface 2b of the permanent magnet magnetic circuit system 2 is larger and the connection strength is better. When the outer side surface of the yoke iron assembly 22 and the outer side surface of the magnet 210 are not flush, the relatively convex surface of the two is the outer side surface 2b of the permanent magnet magnetic circuit system 2.

[0151] When the coil 3 is relatively fixed to the permanent magnet magnetic circuit system 2, it moves synchronously with the permanent magnet magnetic circuit system 2. For example, in some embodiments, such as Figure 3 , Figure 30 , Figure 33 and Figure 36 shown, the magnetic conductive plate assembly 4 is relatively fixed to the housing assembly 1. During the working process of the bone conduction oscillator, the whole formed by the coil 3 and the permanent magnet magnetic circuit system 2 vibrates relative to the magnetic conductive plate assembly 4, and the mass of its vibrating part is relatively large, which is beneficial to reducing the low-frequency resonance frequency. In some embodiments, such as Figures 45 to 47As shown, the permanent magnet magnetic circuit system 2 is connected to the housing assembly 1 through a spacer 60. One side of the spacer 60 is connected to the housing assembly 1, and the other side is connected to the outer surface 2a of the permanent magnet magnetic circuit system 2 and / or the reset assembly 5 (such as its shrapnel 50). The connection method can be, for example, adhesive connection. The two ends of the magnetic conduction plate assembly 4 are spaced from the housing assembly 1 and do not contact each other. During the operation of the bone conduction oscillator, the magnetic conduction plate assembly 4 ( Figure 47 ) or the whole formed by the magnetic conduction plate assembly 4 and the connecting plate 53 ( Figure 46 ) vibrates relative to the housing assembly 1. Its mass is relatively small, which is beneficial to increasing the response speed. The spacer 60 can be connected to the substrate 100 of the housing assembly 1 or to the frame 101 of the housing assembly 1. When it is connected to the substrate 100, it is more convenient to form a vibration space between the shrapnel 50 and the substrate 100. The spacer 60 can be made of a magnetic conduction material or a non-magnetic conduction material. When it is made of a magnetic conduction material, it is beneficial to form a magnetic circuit more efficiently.

[0152] In some embodiments, the coil 3 is relatively fixed to the magnetic conduction plate assembly 4 and can be connected to the reset assembly 5 to achieve relative fixation with the magnetic conduction plate assembly 4. For example, in Figure 19 the shown embodiment, the coil 3 is connected to the connecting piece 52 of the shrapnel 50 so that the coil 3 is relatively fixed with respect to the magnetic conduction plate assembly 4. Optionally, the connecting piece 52 is perpendicular to the magnetic conduction plate 40 to improve the support performance and reduce or even prevent the connecting piece 52 from deforming during vibration. The coil 3 and the surface 52a of the connecting piece 52 facing the side where the permanent magnet magnetic circuit system 2 is located can be, for example, adhesively connected. Optionally, the hollow structure partially extends to the surface where the coil 3 contacts the connecting piece 52 (i.e., the outer side surface of the coil 3) to form a glue-containing space and improve the connection strength of the adhesion. Again, in Figure 31 the shown embodiment, the coil 3 is connected to the connecting plate 53 so that the coil 3 is relatively fixed with respect to the magnetic conduction plate assembly 4. The coil 3 and the surface 53a of the connecting plate 53 facing the side where the permanent magnet magnetic circuit system 2 is located can be, for example, adhesively connected. Since the thickness of the connecting plate 53 is greater than the thickness of the connecting piece 52, its stiffness is relatively better. Therefore, during vibration, the connecting plate 53 is not easily deformed and can reliably maintain the connection with the coil 3.

[0153] When the coil 3 is relatively fixed to the magnetic conduction plate assembly 4, it moves synchronously with the magnetic conduction plate assembly 4. For example, Figure 19 、 Figure 31 、 Figure 37 in the shown embodiment, the magnetic conduction plate assembly 4 and the coil 3 are relatively fixed to the housing assembly 1. When the bone conduction oscillator works, the permanent magnet magnetic circuit system 2 vibrates relative to the housing assembly 1, and the magnetic conduction plate assembly 4 and the coil 3 remain relatively stationary with respect to the housing assembly 1. Again, Figure 48 and Figure 49In the illustrated embodiment, the permanent magnet magnetic circuit system 2 is relatively fixed to the housing assembly 1, and the whole formed by the magnetic conductive plate assembly 4 and the coil 3 ( Figure 49 ), or the magnetic conductive plate assembly 4, the coil 3 and the connecting plate 53 ( Figure 48 ) vibrates relative to the housing assembly 1.

[0154] It can be understood that when the coil 3 is relatively fixed to the magnetic conductive plate assembly 4, the distance between it and the magnetic conductive plate 40 remains unchanged all the time, and it is not easy to affect the polarization of the magnetic conductive plate 40 due to the change of the distance between the two, which is beneficial to improving the acoustic performance.

[0155] Optionally, when the coil 3 is connected to the permanent magnet magnetic circuit system 2, there is a gap between it and the connecting piece 52 or the connecting plate 53. When the coil 3 is connected to the connecting piece 52 or the connecting plate 53, there is a gap between it and the permanent magnet magnetic circuit system 2. The setting of the gap can not only prevent the coil 3 from colliding with the permanent magnet magnetic circuit system 2 or the connecting piece 52 and the connecting plate 53 during vibration, but also increase the length of the suspended part 501 of the elastic piece 50, improving the low-frequency acoustic performance.

[0156] In some embodiments of the present invention, an electronic device is also proposed, which includes the bone conduction vibrator described above. The electronic device can be, for example, a wearable electronic device such as a headset, a hearing aid, smart glasses, a smart helmet, etc. Of course, it is not limited to wearable electronic devices. For example, it can also be a mobile phone, etc.

[0157] It should be noted that, without conflict, the embodiments in this article can be combined with each other to obtain more implementation schemes.

[0158] The above is only the specific implementation manner of the present invention, and any improvement made on the premise of the inventive concept of the present invention is regarded as the protection scope of the present invention.

Claims

1. A bone conduction vibrator, characterized in that: include: A housing component (1), wherein the housing component (1) is made of a magnetically conductive material; A permanent magnetic circuit system (2) is arranged in the housing component (1), the permanent magnetic circuit system (2) comprising an iron component (22) and two groups of magnet components (21), the magnet components (21) forming a magnetic circuit through the iron component (22), each group of the magnet components (21) comprising two magnets (210) with opposite poles arranged opposite to each other; Two coils (3) are arranged in the housing component (1), and the two coils (3) are respectively located on two sides of the permanent magnetic circuit system (2); A magnetic conductive plate assembly (4), comprising two magnetic conductive plates (40) respectively inserted into the two coils (3), wherein the magnetic conductive plates (40) extend between two magnets (210) of a magnet assembly (21) adjacent to the coils (3) inserted therethrough, and adjacent ends of the two magnetic conductive plates (40) are not directly magnetically connected; and A reset assembly (5) is connected between the magnetic conductive plate assembly (4) and the permanent magnetic circuit system (2), and comprises a spring sheet (50) for providing elastic force.

2. The bone conduction vibrator according to claim 1, characterized in that: The magnetic conductive plate assembly (4) is relatively fixed to the housing assembly (1), the permanent magnetic circuit system (2) is capable of vibrating relative to the housing assembly (1), and the coil (3) is relatively fixed to the permanent magnetic circuit system (2) or relatively fixed to the magnetic conductive plate assembly (4).

3. The bone conduction vibrator according to claim 2, characterized in that: The magnetic conductive plate assembly (4) is in a strip shape as a whole, and both ends of the magnetic conductive plate assembly (4) are fixedly connected to the housing assembly (1).

4. The bone conduction vibrator according to claim 1, characterized in that: The permanent magnetic circuit system (2) is relatively fixed to the housing component (1), the magnetic conductive plate component (4) is capable of vibrating relative to the housing component (1), and the coil (3) is relatively fixed to the permanent magnetic circuit system (2) or relatively fixed to the magnetic conductive plate component (4).

5. The bone conduction vibrator according to claim 4, characterized in that: It comprises a spacer plate (60) located between the permanent magnetic circuit system (2) and the housing component (1); the spacer plate (60) is connected to the permanent magnetic circuit system (2) and / or the spring sheet (50); in the vibration direction of the bone conduction vibrator, a vibration space is formed between the permanent magnetic circuit system (2) and the inner wall of the housing component (1) through the spacer plate (60).

6. The bone conduction vibrator according to claim 1, characterized in that: The spring sheet (50) is connected to the outer surface of the permanent magnetic circuit system (2) facing away from the magnetic conductive plate (40) in the vibration direction of the bone conduction vibrator, and the two ends of the spring sheet (50) respectively extend toward the sides where the two coils (3) are located, the reset component (5) exceeds the two ends of the two coils (3) in the length direction of the magnetic conductive plate component (4), and the spring sheet (50) has a suspended portion (501) arranged opposite to the coil (3); or, The reset component (5) comprises at least two spring pieces (50) located on the same side of the magnetic plate component (4), the spring pieces (50) being connected to the outer surface of the permanent magnet magnetic circuit system (2) facing away from the magnetic plate (40) in the vibration direction of the bone conduction vibrator, and at least two of the spring pieces (50) respectively extend toward the sides where the two coils (3) are located, the reset component (5) extends in the length direction of the magnetic plate component (4) to beyond the two ends of the two coils (3), and the spring pieces (50) have a suspended portion (501) arranged opposite to the coil (3).

7. The bone conduction vibrator according to claim 1, characterized in that: The two magnetic conductive plates (40) are arranged at intervals along the length direction of the magnetic conductive plate assembly (4), and a spacing space (42) is formed between the two.

8. The bone conduction vibrator according to claim 1, characterized in that: The two magnetic conductive plates (40) are arranged at intervals along the length direction of the magnetic conductive plate assembly (4), and are connected via a connecting block (43), wherein the connecting block (43) is made of non-magnetic conductive material.

9. The bone conduction vibrator according to claim 1, characterized in that: A gasket (44) made of non-magnetic material is provided on the surface of the magnetic conductive plate (40) facing the magnet (210); the gasket (44) connects the two magnetic conductive plates (40) and extends between the magnetic conductive plates (40) and the magnet (210); the hardness of the gasket (44) is less than the hardness of the magnetic conductive plates (40).

10. The bone conduction vibrator according to claim 1, characterized in that: The inner side surface of the magnetic conductive plate (40) is flush with the inner side surface of the adjacent magnet (210).

11. The bone conduction vibrator according to claim 1, characterized in that: The two magnetic poles of the magnet (210) are arranged along the vibration direction of the bone conduction vibrator; The magnetization directions of the magnets (210) of the two groups of magnet assemblies (21) are the same, and the magnetic fields generated by the two coils (3) at the same time are in opposite directions; or, the magnetization directions of the magnets (210) of the two groups of magnet assemblies (21) are in opposite directions, and the magnetic fields generated by the two coils (3) at the same time are in the same direction.

12. The bone conduction vibrator according to claim 1, characterized in that: The two groups of magnet assemblies (21) are arranged at intervals along the length direction of the magnetic conductive plate assembly (4); the two magnets (210) of the two groups of magnet assemblies (21) are both located on both sides of the thickness direction of the magnetic conductive plate assembly (4); and the thickness direction of the magnetic conductive plate assembly (4) is the same as the vibration direction of the bone conduction vibrator.

13. The bone conduction vibrator according to any one of claims 1 to 12, characterized in that: In the vibration direction of the bone conduction vibrator, there is a first distance D1 between the inner wall of the coil (3) and the magnetic conductive plate (40), there is a second distance D2 between the magnet (210) and the magnetic conductive plate (40), there is a third distance D3 between the spring sheet (50) and the housing component (1), and there is a fourth distance D4 between the spring sheet (50) and the coil (3), and the first distance D1, the third distance D3 and the fourth distance D4 are all greater than the second distance D2.

14. The bone conduction vibrator according to claim 1, characterized in that: The ferromagnetic component (22) is provided with a channel (221) penetrating along the length direction of the magnetic conductive plate component (4), and the two magnets (210) of the magnet component (21) are both connected to the inner surface of the magnetic conductive plate (40).

15. The bone conduction vibrator according to claim 14, characterized in that: The two groups of magnet assemblies (21) share one ferrite assembly (22), and the two groups of magnet assemblies (21) are arranged in a channel (221) of the same ferrite assembly (22).

16. The bone conduction vibrator according to claim 14, characterized in that: Each group of the magnet components (21) is correspondingly provided with a group of iron components (22); the two groups of the magnet components (21) are respectively arranged in the channels (221) of the two groups of iron components (22); and the two groups of iron components (22) are connected to the same spring sheet (50).

17. The bone conduction vibrator according to claim 14, characterized in that: The ferrule assembly (22) comprises two ferrules (220), each of the two ferrules (220) comprising a bottom plate (2200) and side plates (2201) protruding from both sides of the bottom plate (2200), the two ferrules (220) being connected via the side plates (2201), and the two magnets (210) of the magnet assembly (21) being respectively connected to the bottom plates (2200) of the two ferrules (220).

18. The bone conduction vibrator according to claim 14, characterized in that: The outer side surface of the ferromagnetic component (22) is flush with the outer side surface of the magnet (210) adjacent thereto.

19. The bone conduction vibrator according to claim 14, characterized in that: In the vibration direction of the bone conduction vibrator, the distance L1 between the ferrite component (22) and the inner wall of the outer shell component (1) does not exceed 1 mm; in the length direction of the magnetic conductive plate component (4), the distance L2 between the magnetic conductive plate (40) and the inner wall of the outer shell component (1) does not exceed 1 mm.

20. The bone conduction vibrator according to any one of claims 1 to 12, characterized in that: In the length direction of the magnetic conductive plate assembly (4), the interval L5 between the two magnetic conductive plates (40) is not less than 0.2 mm.

21. The bone conduction vibrator according to any one of claims 1 to 12, characterized in that: The bone conduction vibrator comprises two groups of reset components (5), and the two groups of reset components (5) are symmetrically arranged on both sides of the magnetic conductive plate component (4) in the thickness direction.

22. An electronic device, characterized in that: Comprising the bone conduction vibrator as described in any one of claims 1 to 21.

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