Vibration transmission sheet and loudspeaker assembly

Abstract

The utility model mainly relates to a vibration transmission sheet and a loudspeaker assembly. The vibration transmission sheet comprises an inner ring body, an outer ring body surrounding the periphery of the inner ring body, and a first connecting rod and a second connecting rod which are connected between the inner ring body and the outer ring body. The outer ring body is provided with a first outer ring edge adjacent to the inner ring body and a second outer ring edge deviating from the inner ring body; a positioning protruding block is arranged on the edge of the second outer ring, and the positioning protruding block protrudes towards the outer portion of the vibration transmission piece. Through the above arrangement, the positioning precision of the vibration transmission sheet in the assembly jig can be improved, so that the vibration transmission sheet can be more accurately matched with the jig for positioning, and the assembly efficiency and the assembly effect of the loudspeaker assembly are improved.

Description

Technical Field

[0001] The present application relates to the field of acoustic technology, and in particular to a vibration transmission sheet and a loudspeaker assembly. Background Art

[0002] With the increasing popularity of electronic devices, electronic devices have become an indispensable social and entertainment tool in people's daily lives, and people's requirements for electronic devices are getting higher and higher. Electronic devices such as headphones have also been widely used in people's daily lives. They can be used in conjunction with terminal devices such as mobile phones and computers to provide users with an auditory feast.

[0003] Current bone conduction headphones are usually equipped with a magnetic circuit and an electric circuit that can generate electromagnetic induction so that the headphones can vibrate to achieve bone conduction, and a vibration transmitter is provided in the bone conduction headphones to connect the magnetic circuit component and the circuit component so as to relatively restrict the positions of the two. However, during the assembly process of the vibration transmitter, the magnetic circuit system and the circuit component, the vibration transmitter and the assembly fixture are usually easily misaligned, resulting in poor assembly effect of the vibration transmitter, the magnetic circuit system and the circuit component. Utility Model Content

[0004] The present application provides a vibration transmission plate and a loudspeaker assembly, which improve the positioning accuracy of the vibration transmission plate in an assembly jig, so that the vibration transmission plate can more accurately cooperate with the jig for positioning, thereby improving the assembly efficiency and assembly effect of the loudspeaker assembly.

[0005] On the one hand, the present application provides a vibration transmission plate, which includes an inner ring body, an outer ring body surrounding the outer periphery of the inner ring body, and a first connecting rod and a second connecting rod connected between the inner ring body and the outer ring body; the outer ring body has a first outer ring edge arranged adjacent to the inner ring body and a second outer ring edge arranged away from the inner ring body; a positioning protrusion is arranged on the second outer ring edge, and the positioning protrusion protrudes toward the outside of the vibration transmission plate.

[0006] In some embodiments, the second outer ring edge includes two first sub-straight segments arranged side by side and back to back and two first sub-curved segments respectively connecting adjacent ends of the two straight segments and protruding toward the outside of the vibration transmission plate; the positioning protrusion is arranged on the first sub-straight segment.

[0007] In some embodiments, the first sub-straight line segment is further provided with a positioning groove recessed toward the inner ring body; the positioning groove and the positioning protrusion are staggered with each other along the circumferential direction of the edge of the second outer ring.

[0008] In some embodiments, the positioning protrusion is located at the edge of the positioning groove. When observed along a direction perpendicular to the main surface of the outer ring body, a side edge of the positioning protrusion close to the positioning groove and a groove wall of the positioning groove are located in a straight line to form a first straight line.

[0009] In some embodiments, the first straight line is perpendicularly disposed with respect to the first sub-straight line segment.

[0010] In some embodiments, the positioning bump is rectangularly shaped.

[0011] In some embodiments, positioning bumps are respectively disposed on both sides of the positioning slot.

[0012] In some embodiments, the number of the positioning slots and the positioning bumps is two groups, and they are respectively disposed on two first sub-straight line segments.

[0013] In some embodiments, each group of the positioning slots and the positioning bumps is centrally disposed with respect to the first sub-straight line segment along the extending direction of the first sub-straight line segment.

[0014] In some embodiments, the protruding length of the positioning bump with respect to the second outer ring edge is between 0.315 mm and 0.385 mm, and the width with respect to the second outer ring edge is between 0.378 mm and 0.462 mm.

[0015] In some embodiments, the present application provides a speaker assembly. The speaker assembly includes a transducer device. The transducer device includes a voice coil, a bracket, a magnetic circuit system, and a vibration transmission sheet as in the above embodiments. The inner ring body of the vibration transmission sheet is connected to the bracket, and the outer ring body is connected to the magnetic circuit system to elastically suspend the magnetic circuit system around the bracket. The voice coil is disposed on the bracket.

[0016] The beneficial effects of the present application are as follows: Different from the prior art, the present application provides positioning bumps on the second outer ring edge of the vibration transmission sheet, and the positioning bumps can protrude outward from the vibration transmission sheet, which enables the vibration transmission sheet to be positioned in the assembly jig through the positioning bumps during installation, thereby improving the positioning accuracy of the vibration transmission sheet in the assembly jig, facilitating the vibration transmission sheet to be more accurately positioned with the jig, reducing the situation of the vibration transmission sheet shaking in the assembly jig, and also facilitating the subsequent installation of other components on the vibration transmission sheet, so as to improve the assembly efficiency and assembly effect of the speaker assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of an embodiment of a bone conduction headset provided by the present application;

[0018] Figure 2 is a schematic diagram of the overall structure of an embodiment of a speaker assembly provided by the present application;

[0019] Figure 3 is a schematic diagram of the overall structure of an embodiment of a transducer device provided by the present application;

[0020] Figure 4 is Figure 3Schematic cross-sectional structure diagram of the transducer device embodiment shown along the A-A cutting direction;

[0021] Figure 5 It is a schematic overall structure diagram of an embodiment of the vibration transmission sheet provided by this application;

[0022] Figure 6 Is Figure 5 Enlarged schematic diagram of the Q area in the vibration transmission sheet embodiment shown;

[0023] Figure 7 Is Figure 5 Another schematic overall structure diagram of the vibration transmission sheet embodiment shown;

[0024] Figure 8 Is Figure 5 Schematic diagram of the stress distribution of the vibration transmission sheet embodiment shown under a load along the length direction;

[0025] Figure 9 Is Figure 5 Schematic diagram of the stress distribution of the vibration transmission sheet embodiment shown under a load along the width direction;

[0026] Figure 10 Is Figure 5 Schematic diagram of a stress distribution of the vibration transmission sheet embodiment shown under an axial load along the axial direction;

[0027] Figure 11 Is Figure 5 Another schematic diagram of the stress distribution of the vibration transmission sheet embodiment shown under an axial load along the axial direction;

[0028] Figure 12 Is Figure 5 Schematic diagram of the stress distribution of the vibration transmission sheet embodiment shown under a flipping load when flipped around the width direction. Specific implementation manners

[0029] The following combines the drawings and embodiments to make a further detailed description of this application. It should be specifically noted that the following embodiments are only used to illustrate this application, but do not limit the scope of this application. Similarly, the following embodiments are only partial embodiments of this application rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by this application.

[0030] When "embodiment" is mentioned in this application, it means that the specific features, structures or characteristics described in combination with the embodiment can be included in at least one embodiment of this application. Those skilled in the art explicitly and implicitly understand that the embodiments described in this application can be combined with other embodiments.

[0031] The following is an exemplary description of a bone conduction headphone with bone conduction headphone embodiments.

[0032] The bone conduction headphone 1 is a headphone that can generate bone conduction sound through bone conduction vibration and conduct the bone conduction sound to the user. Optionally, as Figure 1 shown, the bone conduction headphone 1 may include a speaker assembly 10, and the speaker assembly 10 can be used to be placed in the facial area in front of the tragus of the user's left ear and / or right ear and fit with the user's facial area. The speaker assembly 10 is used to convert an electrical signal containing relevant audio information into an air conduction sound and / or into a bone conduction sound, and further conduct the bone conduction sound to the user.

[0033] In some embodiments, the bone conduction headphone 1 may further include a wearing assembly 20 and a stick microphone assembly 30. The number of the speaker assemblies 10 may be two. One of the speaker assemblies 10 is placed in the facial area in front of the tragus of the user's left ear for transmitting bone conduction sound and / or air conduction sound to the user's left ear, and the other speaker assembly 10 is placed in the facial area in front of the tragus of the user's right ear for transmitting bone conduction sound and / or air conduction sound to the user's right ear.

[0034] The wearing assembly 20 can be respectively connected to the two speaker assemblies 10. The wearing assembly 20 can position the speaker assemblies 10 in the facial area in front of the user's tragus. The two speaker assemblies 10 can be the same or different. For example, one speaker assembly 10 can be provided with a stick microphone assembly 30, while the other speaker assembly 103 can be not provided with a stick microphone assembly 30. For example, one speaker assembly 10 is used to transmit bone conduction sound to the user, while the other speaker assembly 103 is used to transmit air conduction sound to the user.

[0035] In some embodiments, as Figure 2 shown, the speaker assembly 10 may include a transducer device 11, and the transducer device 11 is the main device in the speaker assembly 10 that converts an electrical signal into a bone conduction sound.

[0036] Optionally, as Figure 3 and Figure 4 shown, the transducer device 11 may include a voice coil 100, a bracket 200, a magnetic circuit system 300, and a vibration transmission sheet 400. The vibration transmission sheet 400 connects the bracket 200 and the magnetic circuit system 300 to elastically suspend the magnetic circuit system 300 around the bracket 200. The voice coil 100 is arranged on the bracket 200 and cooperates with the magnetic circuit system 300. Specifically, when the voice coil 100 accesses an electrical signal containing relevant audio information, the magnetic circuit system 300 can drive the voice coil 100 and the bracket 200 to vibrate together.

[0037] Among them, the voice coil 100 can be connected to an electrical signal containing relevant audio information, and the bracket 200 can be arranged inside the magnetic circuit system 300. The voice coil 100 can be wound and fixed on the bracket 200 along the radial direction of the bracket 200. The voice coil 100 corresponds to the magnetic circuit system 300 so that the electric field of the voice coil 100 when accessing an electrical signal containing relevant audio information can interact with the magnetic field of the magnetic circuit system 300. It can be understood that the radial direction of the bracket 200 can be perpendicular to the vibration direction of the bracket 200. Of course, in some scenarios, when affected by the user or other objects, the radial direction of the bracket 200 can form an angle greater than 0° and less than 90° with the vibration direction of the bracket 200.

[0038] Specifically, since the voice coil 100 is opposite to the magnetic circuit system 300 in the radial direction of the transducer 11, the electric field of the voice coil 100 can interact with the magnetic field of the magnetic circuit system 300, thereby generating an electromagnetic reaction, causing the magnetic circuit system 300 and the bracket 200 provided with the voice coil 100 to move relative to each other, so that the transducer 11 generates vibration and generates bone-conducted sound capable of transmitting relevant audio information.

[0039] The vibration transmission piece 400 can undergo a certain elastic deformation under the action of an external force and can return to its original shape after the external force is removed. Since the vibration transmission piece 400 is respectively connected to the bracket 200 and the magnetic circuit system 300, when the magnetic circuit system 300 and the voice coil 100 move relative to each other, the magnetic circuit system 300 and the bracket 200 provided with the voice coil 100 move relative to each other. At the same time, the vibration transmission piece 400 can elastically constrain the magnetic circuit system 300 and the bracket 200 provided with the voice coil 100 to limit the bracket 200 in the magnetic circuit system 300, so that the operation of the transducer 11 can be kept stable.

[0040] In some embodiments, the vibration transmission piece 400 can be made of a metal material, and the metal material can include but is not limited to steel materials (such as stainless steel, carbon steel, etc.), light alloys (such as aluminum alloy, beryllium copper, magnesium alloy, titanium alloy, etc.). In some embodiments, the vibration transmission piece 400 can also be made of other single or composite materials that can achieve the same performance. For example, the composite material can include but is not limited to reinforcing materials such as glass fiber, carbon fiber, boron fiber, graphite fiber, silicon carbide fiber or aramid fiber.

[0041] In some embodiments, as Figure 5 shown, the vibration transmission piece 400 can include an inner ring body 410, an outer ring body 420 surrounding the periphery of the inner ring body 410, and first connecting rods 430 and second connecting rods 440 connecting the inner ring body 410 and the outer ring body 420.

[0042] Among them, the inner ring body 410 of the vibration transmission sheet 400 is connected to the bracket 200, the outer ring body 420 is connected to the magnetic circuit system 300, and the first link 430 and the second link 440 are respectively connected to the inner ring body 410 and the outer ring body 420. When the bracket 200 and the magnetic circuit system 300 move relative to each other, the first link 430 and the second link 440 can undergo elastic deformation, support the relative movement of the inner ring body 410 and the outer ring body 420, and also constrain the inner ring body 410 and the outer ring body 420, making it difficult for the bracket 200 and the magnetic circuit system 300 to separate from each other. However, the first link 430 and the second link 440 thus bear relatively large tensile forces.

[0043] Specifically, as Figure 5 shown, the inner ring body 410 may have a first inner ring edge 411 disposed adjacent to the outer ring body 420. The first inner ring edge 411 may include two first straight segments 4111 and two first curved segments 4112. The two first straight segments 4111 are arranged side by side and in opposite directions, and the two first curved segments 4112 respectively connect the adjacent ends of the two first straight segments 4111 and protrude toward the outside of the vibration transmission sheet 400. The outer ring body 420 may have a first outer ring edge 421 disposed adjacent to the inner ring body 410. The first outer ring edge 421 may include two second straight segments 4211 and two second curved segments 4212. The two second straight segments 4211 are respectively located outside the two first straight segments 4111, and the two second curved segments 4212 are respectively located outside the two first curved segments 4112. Thus, a straight gap 401 is formed between the adjacent first straight segment 4111 and the second straight segment 4211, and a curved gap 402 is formed between the adjacent first curved segment 4112 and the second curved segment 4212.

[0044] Among them, both the first link 430 and the second link 440 can be connected to the inner ring body 410 at one end and the outer ring body 420 at the other end. Therefore, when the inner ring body 410 and the outer ring body 420 move relative to each other driven by the bracket 200 and the magnetic circuit system 300, the first link 430 and the second link 440 can more firmly connect the inner ring body 410 and the outer ring body 420.

[0045] Specifically, as Figure 5 shown, the first link 430 may include a first inner connection portion 431 connected to the first inner ring edge 411, a first outer connection portion 432 connected to the first outer ring edge 421, and a straight extension portion 433 connected between the first inner connection portion 431 and the first outer connection portion 432 and located within the straight gap 401.

[0046] As Figure 5As shown, the second link 440 may include a second inner connection portion 441 connected to the first inner ring edge 411, a second outer connection portion 442 connected to the first outer ring edge 421, and a curved extension portion 443 connected between the second inner connection portion 441 and the second outer connection portion 442 and located within the curved gap 402.

[0047] The first link 430 corresponds to the first straight segment 4111 and the second straight segment 4211, and the second link 440 corresponds to the first curved segment 4112 and the second curved segment 4212. Such an arrangement can reduce the influence of the first link 430 and the second link 440 on the relative movement of the inner ring body 410 and the outer ring body 420. Thus, when the inner ring body 410 moves relative to the outer ring body 420, the sensitivity of the relative movement between the inner ring body 410 and the outer ring body 420 can be maintained, so as to improve the effect of the bone conduction headphone 1 in transmitting bone conduction sound through bone conduction vibration. At the same time, the stiffness in the radial direction of the vibration transmission sheet 400 (such as Figure 5 the direction perpendicular to the thickness direction of the vibration transmission sheet 400) can also be increased, so that the first link 430 and the second link 440 are not easily broken, thereby improving the reliability and lifespan of the vibration transmission sheet 400.

[0048] In some embodiments, as Figure 5 shown, the number of the first links 430 and the second links 440 can be two respectively, and the two first links 430 and the two second links 440 are rotationally symmetric by 180 degrees with respect to the centroid or center of mass of the inner ring body 410. In other words, the two first links 430 and the two second links 440 are spaced apart from each other in the circumferential direction of the inner ring body 410. The two first links 430 are oppositely arranged in the interval direction of the two first straight segments 4111, and the two second links 440 are oppositely arranged in the interval direction of the two first curved segments 4112. Among them, the interval direction of the two first straight segments 4111 is as Figure 5 shown by the X arrow direction in Figure 5 and the interval direction of the two first curved segments 4112 is as shown by the Y arrow direction in

[0049]

[0050] In some embodiments, as Figure 5As shown, the first inner connection part 431 and the second outer connection part 442 can be adjacently arranged in the circumferential direction of the vibration transmission sheet 400, and the first outer connection part 432 and the second inner connection part 441 are adjacently arranged in the circumferential direction of the vibration transmission sheet 400.

[0051] Since the first connecting rod 430 is connected to the first inner ring edge 411 through the first inner connection part 431 and to the first outer ring edge 421 through the first outer connection part 432, and the second connecting rod 440 is connected to the first outer ring edge 421 through the second outer connection part 442 and to the first inner ring edge 411 through the second inner connection part 441, it is possible to make the first inner connection part 431 and the second inner connection part 441 connecting the inner ring body 410 not adjacent to each other and as far apart as possible, and the first inner connection part 431 and the second inner connection part 441 connecting the outer ring body 420 not adjacent to each other and as far apart as possible. With such an arrangement, the inner ring body 410 and the outer ring body 420 can be pulled and constrained by the first connecting rod 430 and the second connecting rod 440 during relative movement, thereby reducing the stress concentration at the connection points where the inner ring body 410 and the outer ring body 420 are respectively connected to the first connecting rod 430 and the second connecting rod 440, and thus reducing the occurrence of fracture of the vibration transmission sheet 400 and improving the reliability of the vibration transmission sheet 400.

[0052] In some embodiments, as Figure 5 shown, the inner and outer edges of the first curved section 4112, the second curved section 4212, and the curved extension 443 can be respectively arranged in a circular arc shape with a common center, and the inner and outer edges of the first straight section 4111, the second straight section 4211, and the straight extension 433 are parallel to each other.

[0053] Specifically, both ends of the first straight section 4111 are respectively connected to two first curved sections 4112, and both ends of the second straight section 4211 are also respectively connected to two second curved sections 4212, so that the inner ring body 410 and the outer ring body 420 present an oval track shape.

[0054] Since the curved extension 443 is concentric with the first curved section 4112 and the second curved section 4212, and the inner and outer edges of the straight extension 433 are parallel to the first straight section 4111 and the second straight section 4211, it is possible to prevent the curved extension 443 and the straight extension 433 from contacting the inner ring body 410 and the outer ring body 420 during the relative movement of the inner ring body 410 and the outer ring body 420, thereby increasing the sensitivity of the relative movement of the inner ring body 410 and the outer ring body 420, and also increasing the stiffness of the vibration transmission sheet 400, so that the curved extension 443 and the straight extension 433 are not easily damaged during the relative movement of the inner ring body 410 and the outer ring body 420.

[0055] In some embodiments, as Figure 5As shown, the connection points of the first link 430 with the first inner ring edge 411 and the first outer ring edge 421 can exhibit a smooth transition connection. The connection points of the second link 440 with the first inner ring edge 411 and the first outer ring edge 421 also exhibit a smooth transition connection.

[0056] Specifically, the first link 430 is smoothly transition-connected to the first inner ring edge 411 through the first inner connection part 431 and is smoothly transition-connected to the first outer ring edge 421 through the first outer connection part 432. The second link 440 is smoothly transition-connected to the first inner ring edge 411 through the second inner connection part 441 and is smoothly transition-connected to the first outer ring edge 421 through the second outer connection part 442.

[0057] With such an arrangement, the connection strength between the first link 430 and the inner ring body 410 and the outer ring body 420 can be improved, and the connection strength between the second link 440 and the inner ring body 410 and the outer ring body 420 can be improved. Thus, the anti-bending ability of the first link 430 and the second link 440 can be enhanced, so that the first link 430 and the second link 440 are not easily damaged due to bending during elastic deformation, and thereby the service life of the vibration transmission piece 400 can be extended.

[0058] In some embodiments, the connection points of the straight bar extension part 433 with the first inner connection part 431 and with the first outer connection part 432 both exhibit smooth transitions. The first inner connection part 431 exhibits a smooth transition with the first inner ring edge 411, and the first outer connection part 432 also exhibits a smooth transition with the first outer ring edge 421. The connection points of the curved extension part 443 with the second inner connection part 441 and with the second outer connection part 442 also both exhibit smooth transitions. The second inner connection part 441 exhibits a smooth transition with the first inner ring edge 411, and the second outer connection part 442 exhibits a smooth transition with the first outer ring edge 421.

[0059] With such an arrangement, the strength of the first link 430 and the second link 440 can be improved. Thus, the anti-bending ability of the first link 430 and the second link 440 can be enhanced, so that the first link 430 and the second link 440 are not easily damaged due to bending during deformation, and thereby the service life of the vibration transmission piece 400 can be extended.

[0060] In some embodiments, such as Figure 5 and Figure 6As shown, the inner edge of the curved extension 443 can be arranged in an arc shape. The inner edge of the second inner connection part 441 can include a first arc segment 4411 connected to the first inner ring edge 411 and a second arc segment 4412 connecting the first arc segment 4411 and the inner edge of the curved extension 443. Among them, the first arc segment 4411 and the second arc segment 4412 are connected at the short dashed line. The inner edge of the curved extension 443 refers to the side of the curved extension 443 facing the first inner ring edge 411, and the inner edge of the second inner connection part 441 refers to the edge of the second inner connection part 441 that is oppositely arranged to connect the first inner ring edge 411 and the inner edge of the curved extension 443, and is the edge connecting the inner edge of the curved extension 443.

[0061] Since, when the second link 440 undergoes elastic deformation, its internal stress will concentrate on the inner edge of the second inner connection part 441 and the curved extension 443. If the inner edge of the curved extension 443 and the inner edge of the second inner connection part 441 are set to other shapes, such as an included angle shape, when the second link 440 undergoes elastic deformation, its stress will concentrate at the included angle, which is likely to cause the vibration transmission piece 400 to tear from the included angle.

[0062] Therefore, setting the inner edge of the curved extension 443 to an arc shape and the inner edge of the second inner connection part 441 to a multi-segment arc shape can reduce the concentration of internal stress when the curved extension 443 and the second inner connection part 441 undergo elastic deformation, thereby improving the anti-bending ability of the curved extension 443 and the second inner connection part 441, and thus being not easily damaged during elastic deformation, so as to improve the reliability and service life of the vibration transmission piece 400.

[0063] Of course, in other embodiments, the inner edge of the curved extension 443 and the inner edge of the second inner connection part 441 can also be set to other shapes such as a wavy shape or a broken line shape, and this embodiment will not list them specifically one by one here.

[0064] Optionally, as Figure 6 shown, both the first arc segment 4411 and the second arc segment 4412 can be concave arcs. Among them, setting both the first arc segment 4411 and the second arc segment 4412 to concave arcs can make the inner edge of the second inner connection part 441 smoother, thereby achieving a natural transition connection between the curved extension 443 and the first inner ring edge 411, and enhancing the connection strength between the curved extension 443 and the inner ring body 410 connected through the second inner connection part 441.

[0065] Optionally, the ratio of the diameter of the first arc segment 4411 to the diameter of the inner edge of the curved extension 443 may be between 0.02 and 0.03, and the ratio of the diameter of the second arc segment 4412 to the diameter of the inner edge of the curved extension 443 may be between 0.11 and 0.14.

[0066] Specifically, if the ratio of the diameter of the first arc segment 4411 to the diameter of the inner edge of the curved extension 443 is greater than 0.03, and the ratio of the diameter of the second arc segment 4412 to the diameter of the inner edge of the curved extension 443 is greater than 0.14, the diameters of the first arc segment 4411 and the second arc segment 4412 will be too large, resulting in a wider distance between the inner edge of the curved extension 443 and the first inner ring edge 411. This will increase the tensile force borne by the curved extension 443 when restraining the inner ring body 410, causing the curved extension 443 to bear a large stress and be prone to deformation and fracture. If the ratio of the diameter of the first arc segment 4411 to the diameter of the inner edge of the curved extension 443 is less than 0.02, and the ratio of the diameter of the second arc segment 4412 to the diameter of the inner edge of the curved extension 443 is less than 0.11, when the curved extension 443 and the second inner connecting portion 441 undergo elastic deformation, the stress will be overly concentrated at the second inner connecting portion 441, making the second inner connecting portion 441 prone to fracture.

[0067] Therefore, setting the ratio of the diameter of the first arc segment 4411 to the diameter of the inner edge of the curved extension 443 between 0.02 and 0.03, and setting the ratio of the diameter of the second arc segment 4412 to the diameter of the inner edge of the curved extension 443 between 0.11 and 0.14 can improve the vibration sensitivity of the vibration transmission sheet 400 while effectively dispersing the stress of the curved extension 443 and the second inner connecting portion 441, reducing stress concentration, thereby improving the anti-bending ability of the curved extension 443 and the second inner connecting portion 441, and making it less likely to fracture and damage during elastic deformation.

[0068] For example, the ratio of the diameter of the first arc segment 4411 to the diameter of the inner edge of the curved extension 443 can be set to values such as 0.0254, 0.0270, or 0.0285. The ratio of the diameter of the second arc segment 4412 to the diameter of the inner edge of the curved extension 443 can be set to values such as 0.1095, 0.1168, or 0.121.

[0069] In some embodiments, such as Figure 6As shown, the outer edge of the second inner connecting portion 441 can be arranged opposite to the inner edge of the second inner connecting portion 441. The outer edge of the second inner connecting portion 441 can include a third arc segment 4413 connected to the first inner ring edge 411 and a fourth arc segment 4414 connecting the third arc segment 4413 and the outer edge of the curved extension portion 443. Among them, the third arc segment 4413 and the fourth arc segment 4414 are connected at the short dashed line. The outer edge of the curved extension portion 443 can be the side of the curved extension portion 443 facing the first outer ring edge 421, and the outer edge of the second inner connecting portion 441 can refer to the side of the second inner connecting portion 441 connecting the first inner ring edge 411 and the outer edge of the curved extension portion 443.

[0070] Optionally, as Figure 6 shown, the third arc segment 4413 can be a concave arc, and the fourth arc segment 4414 can be a convex arc. Among them, setting the third arc segment 4413 as a concave arc can enable the third arc segment 4413 to be smoothly connected to the first inner ring edge 411. Setting the fourth arc segment 4414 as a convex arc can facilitate the smooth connection of the fourth arc segment 4414 to the third arc segment 4413 and the outer edge of the curved extension portion 443, thereby enhancing the connection strength between the curved extension portion 443 and the inner ring body 410 connected by the second inner connecting portion 441.

[0071] Optionally, the ratio of the diameter of the third arc segment 4413 to the diameter of the inner edge of the curved extension portion 443 and the ratio of the diameter of the fourth arc segment 4414 to the diameter of the inner edge of the curved extension portion 443 are between 0.16 and 0.2.

[0072] If the ratio of the diameter of the third arc segment 4413 and / or the fourth arc segment 4414 to the diameter of the inner edge of the curved extension 443 is greater than 0.2, it will also make the distance between the curved extension 443 and the first inner ring edge 411 wider, thus increasing the tensile force borne by the curved extension 443 when restraining the inner ring body 410, causing the curved extension 443 to bear greater stress and be prone to deformation and fracture. If the ratio of the diameter of the third arc segment 4413 and / or the fourth arc segment 4414 to the diameter of the inner edge of the curved extension 443 is less than 0.16, it will result in the connection between the outer edge of the second inner connection part 441 and the inner edge of the curved extension 443 approaching a right angle or an acute angle shape, and also make the connection between the outer edge of the second inner connection part 441 and the first inner ring edge 411 approach a right angle or an acute angle shape. Therefore, when the curved extension 443 and the second inner connection part 441 undergo elastic deformation, the stress will be overly concentrated at the second inner connection part 441, making the second inner connection part 441 prone to fracture. Therefore, setting the ratio of the diameter of the third arc segment 4413 to the diameter of the inner edge of the curved extension 443 and the ratio of the diameter of the fourth arc segment 4414 to the diameter of the inner edge of the curved extension 443 between 0.16 and 0.2 can disperse the stress between the curved extension 443 and the second inner connection part 441, thereby improving the reliability of the vibration transmission sheet 400.

[0073] For example, the ratio of the diameter of the third arc segment 4413 to the diameter of the inner edge of the curved extension 443 and the ratio of the diameter of the fourth arc segment 4414 to the diameter of the inner edge of the curved extension 443 can be set to values such as 0.1732, 0.181, or 0.1957.

[0074] In some embodiments, the diameter of the fourth arc segment 4414 may be the same as the diameter of the third arc segment 4413. Such a setting will make the stress at the third arc segment 4413 and the fourth arc segment 4414 more uniform when the second inner connection part 441 undergoes elastic deformation, thereby increasing the connection strength between the curved extension 443 and the inner ring body 410 through the second inner connection part 441.

[0075] In some embodiments, the ratio of the straight-line distance between the connection point of the first arc segment 4411 and the first inner ring edge 411 and the connection point of the third arc segment 4413 and the first inner ring edge 411 to the width of the curved extension 443 may be between 2.65 and 3.25.

[0076] Among them, the straight-line distance from the connection point of the first arc segment 4411 and the first inner ring edge 411 to the connection point of the third arc segment 4413 and the first inner ring edge 411 is the width of the connection between the second inner connection part 441 and the first inner ring edge 411. Specifically, the straight-line distance from the connection point of the first arc segment 4411 and the first inner ring edge 411 to the connection point of the third arc segment 4413 and the first inner ring edge 411 can be as shown by the length H1 in Figure 6 and the width of the curved extension part 443 can be as shown by the length h1 in Figure 6

[0077] Setting the width of the connection between the second inner connection part 441 and the first inner ring edge 411 corresponding to the width of the curved extension part 443 can make the connection strength between the second inner connection part 441 and the first inner ring edge 411 stronger.

[0078] Specifically, if the ratio of the straight-line distance from the connection point of the first arc segment 4411 and the first inner ring edge 411 to the connection point of the third arc segment 4413 and the first inner ring edge 411 to the width of the curved extension part 443 is set to be less than 2.65, the connection between the second inner connection part 441 and the first inner ring edge 411 will be relatively weak, and the second inner connection part 441 is likely to break when undergoing elastic deformation. If the ratio of the straight-line distance from the connection point of the first arc segment 4411 and the first inner ring edge 411 to the connection point of the third arc segment 4413 and the first inner ring edge 411 to the width of the curved extension part 443 is set to be greater than 3.25, the connection between the second inner connection part 441 and the first inner ring edge 411 will be too wide, and the second inner connection part 441 will overly restrict the movement of the inner ring body 410, thereby reducing the vibration sensitivity of the vibration transmission piece 400, and thus reducing the sensitivity of the transducer device 11, affecting the bone conduction effect of the bone conduction earphone 1. Therefore, setting the ratio of the above-mentioned straight-line distance to the width of the curved extension part 443 to be between 2.65 and 3.25 can improve the sensitivity of the vibration transmission piece 400 while improving the anti-bending deformation ability of the vibration transmission piece 400, thereby improving the reliability of the vibration transmission piece 400.

[0079] For example, in some embodiments, the ratio of the straight-line distance from the connection point of the first arc segment 4411 and the first inner ring edge 411 to the connection point of the third arc segment 4413 and the first inner ring edge 411 to the width of the curved extension part 443 can be values such as 2.78, 2.95, or 3.187.

[0080] In some embodiments, the second inner connection part 441 can be arranged adjacent to the first outer connection part 432. As shown in Figure 6 ​As shown, the outer edge of the first outer connection portion 432 may include a fifth arc segment 4321 connected to the first outer ring edge 421 and a sixth arc segment 4322 connecting the fifth arc segment 4321 and the outer edge of the straight bar extension portion 433. Among them, the fifth arc segment 4321 and the sixth arc segment 4322 are connected at the short dashed line. The outer edge of the straight bar extension portion 433 refers to the side of the straight bar extension portion 433 facing the first outer ring edge 421. The outer edge of the first outer connection portion 432 refers to the edge of the first outer connection portion 432 that is oppositely arranged to connect the first outer ring edge 421 and the outer edge of the straight bar extension portion 433, and is the edge connecting the outer edge of the straight bar extension portion 433.

[0081] Optionally, as Figure 6 shown, the fifth arc segment 4321 and the sixth arc segment 4322 may be concave arcs. Among them, setting the fifth arc segment 4321 and the sixth arc segment 4322 as concave arcs makes the outer edge of the first outer connection portion 432 smoother, thereby achieving a natural transition connection between the curved extension portion 443 and the first outer ring edge 421, and enhancing the connection strength between the first inner connection portion 431 and the outer ring body 420 connected by the first outer connection portion 432.

[0082] Optionally, the ratio of the diameter of the fifth arc segment 4321 to the diameter of the inner edge of the curved extension portion 443 is between 0.02 and 0.03, and the ratio of the diameter of the sixth arc segment 4322 to the diameter of the inner edge of the curved extension portion 443 is between 0.11 and 0.14.

[0083] Among them, setting the diameters of the fifth arc segment 4321 and the sixth arc segment 4322 to be also related to the diameter of the curved extension portion 443 can make the outer edge of the first outer connection portion 432 correspond to the second inner connection portion 441. When both the first link 430 and the second link 440 are stressed and elastically deformed, the stresses borne by the first link 430 and the second link 440 are equivalent. Therefore, the stress can be evenly distributed, providing the reliability of the vibration transmission piece 400.

[0084] Specifically, if the ratio of the diameter of the fifth arc segment 4321 to the diameter of the outer edge of the curved extension 443 is greater than 0.03, and the ratio of the diameter of the sixth arc segment 4322 to the diameter of the outer edge of the curved extension 443 is greater than 0.14, the diameters of the fifth arc segment 4321 and the sixth arc segment 4322 will be too large, resulting in a wider distance between the straight extension 433 and the first outer ring edge 421. This will increase the tensile force borne by the straight extension 433, causing the straight extension 433 to bear a large stress and be prone to deformation and fracture. If the ratio of the diameter of the fifth arc segment 4321 to the diameter of the outer edge of the curved extension 443 is less than 0.02, and the ratio of the diameter of the sixth arc segment 4322 to the diameter of the outer edge of the curved extension 443 is less than 0.11, the connection between the outer edge of the first outer connection part 432 and the inner edge of the straight extension 433 will tend to be in a right-angled or acute-angled shape, and the connection between the outer edge of the first outer connection part 432 and the first outer ring edge 421 will also tend to be in a right-angled or acute-angled shape. Therefore, when the straight extension 433 and the first outer connection part 432 undergo elastic deformation, the stress will be overly concentrated at the first outer connection part 432, making the first outer connection part 432 prone to fracture. It will also increase the binding force of the straight extension 433 on the inner ring body 410, thus affecting the vibration sensitivity of the vibration transmission piece 400.

[0085] Therefore, by setting the ratio of the diameter of the fifth arc segment 4321 to the diameter of the outer edge of the curved extension 443 to be between 0.02 and 0.03, and setting the ratio of the diameter of the sixth arc segment 4322 to the diameter of the outer edge of the curved extension 443 to be between 0.11 and 0.14, the stress at the first outer connection part 432 can be effectively dispersed, stress concentration can be reduced, thereby improving the anti-bending ability of the straight extension 433 and the first outer connection part 432, and making it not easy to break and damage during elastic deformation.

[0086] For example, in some embodiments, the ratio of the diameter of the fifth arc segment 4321 to the diameter of the outer edge of the curved extension 443 can be numerical values such as 0.0254, 0.0270, 0.0285, etc. The ratio of the diameter of the sixth arc segment 4322 to the diameter of the outer edge of the curved extension 443 can be set to numerical values such as 0.1095, 0.1168, or 0.121.

[0087] In some embodiments, the diameter of the fifth arc segment 4321 may be the same as that of the first arc segment 4411, and the diameter of the sixth arc segment 4322 may be the same as that of the second arc segment 4412. With such an arrangement, the inner edge of the second inner connection portion 441 and the outer edge of the first outer connection portion 432 can be made to have a consistent setting, so that the connection between the first link 430 and the inner ring body 410 and the connection between the second link 440 and the outer ring body 420 can not only share the same stress, thereby reducing the problem of stress concentration at the connection of the first link 430 and the second link 440. Moreover, the adjacent arrangement of the connection between the first link 430 and the inner ring body 410 and the connection between the second link 440 and the outer ring body 420 can also reduce the problem of excessive stress concentration on the inner ring body 410 and the outer ring body 420 when they are constrained by the first link 430 and the second link 440.

[0088] In some embodiments, as Figure 6 shown, the inner edge of the first outer connection portion 432 may include a seventh arc segment 4323 connected to the first outer ring edge 421 and an eighth arc segment 4324 connecting the inner edge of the seventh arc segment 4323 and the straight bar extension portion 433. Among them, the seventh arc segment 4323 and the eighth arc segment 4324 are connected at the short dashed line in Figure 6 . The inner edge of the straight bar extension portion 433 refers to the side of the straight bar extension portion 433 facing the inner ring body 410, and the inner edge of the first outer connection portion 432 refers to the side of the first outer connection portion 432 connecting the inner edge of the straight bar extension portion 433 and the first outer ring edge 421.

[0089] Among them, the seventh arc segment 4323 may be a concave arc, and the eighth arc segment 4324 may be a convex arc. With such an arrangement, the inner edge of the first outer connection portion 432 can be naturally connected and transitioned with the first outer ring edge 421 and the inner edge of the straight bar extension portion 433, thereby enhancing the connection strength of the second inner connection portion 441.

[0090] Optionally, as Figure 7 shown, the line connecting the centers of the fourth arc segment 4414 and the eighth arc segment 4324 has a midpoint, and the angle formed by the line connecting the midpoint and the center of the inner edge of the curved extension portion 443 and the spacing direction of the two first straight line segments 4111 is between 8° and 18°. Among them, the above midpoint can be referred to as the midpoint D in Figure 7 , the center of the inner edge of the curved extension portion 443 can be referred to as the center E in Figure 7 , and the angle formed by the line connecting the midpoint D and the center E of the inner edge of the curved extension portion 443 and the spacing direction of the two first straight line segments 4111 can be referred to as the angle α in Figure 7 .

[0091] Specifically, according to the above-mentioned included angle α, the positions of the fourth arc segment 4414 and the eighth arc segment 4324 can be correspondingly determined on the outer edge of the inner ring body 410, and then the positions of the first inner connecting portion 431 and the second outer connecting portion 442 can be determined. Therefore, the setting of the included angle α can correspondingly adjust the settings of the first inner connecting portion 431 and the second outer connecting portion 442, and further adjust the position lengths and force states of the first link 430 and the second link 440, so as to adjust the force state of the vibration transmission sheet 400 in the radial direction, especially the force states in the interval directions of the two first straight segments 4111 and the two first curved segments 4112.

[0092] When the included angle α formed by the line connecting the centers of the fourth arc segment 4414 and the eighth arc segment 4324 and the interval direction of the two first straight segments 4111 is set to be between 8° and 18°, it can ensure that the forces on the first link 430 and the second link 440 are more balanced, thereby reducing the phenomenon of stress concentration, and can also correspondingly and evenly ensure the stiffness of the vibration transmission sheet 400 in the interval directions of the two first straight segments 4111 and the two first curved segments 4112. If the included angle α is less than 8° or greater than 18°, the stress will be too concentrated in the interval direction of the two first straight segments 4111 or the interval direction of the two first curved segments 4112, and the stiffness in the other direction will also be reduced. Therefore, when the transducer device 11 vibrates, the vibration transmission sheet 400 is prone to breakage.

[0093] In some embodiments, the included angle α can be between 11° and 15°. With such a setting, it is possible to further make the forces on the first link 430 and the second link 440 more balanced while ensuring the stiffness of the vibration transmission sheet 400 in all directions. For example, the included angle α can be 12°, 13° or 14°, etc.

[0094] In some embodiments, the ratio of the connection length between the centers of the fourth arc segment 4414 and the eighth arc segment 4324 to the width of the curved extension portion 443 or the straight extension portion 433 is between 3.71 and 4.54. Among them, the connection length between the centers of the fourth arc segment 4414 and the eighth arc segment 4324 can be referred to as the length F shown in Figure 7 and the width of the straight extension portion 433 can be, for example, the length h2 shown in Figure 6

[0095] As shown in Figure 7 ​It can be known that the distance between the centers of the fourth arc segment 4414 and the eighth arc segment 4324 involves the arc curvature radii of the fourth arc segment 4414 and the eighth arc segment 4324 and the distance between the two arc segments. Moreover, the magnitudes of the arc curvature radii of the fourth arc segment 4414 and the eighth arc segment 4324 also involve the degree of change and transition of connecting the inner ring body 410 and the outer ring body 420 by the first outer connecting portion 432 and the second inner connecting portion 441. Therefore, setting the connection length between the centers of the fourth arc segment 4414 and the eighth arc segment 4324 to be associated with the width of the curved extension portion 443 or the straight bar extension portion 433 can adjust the connection degree of the change and transition of the connection between the first outer connecting portion 432 and the inner ring body 410 and the outer ring body 420, can also adjust the connection degree of the change and transition of the connection between the second inner connecting portion 441 and the inner ring body 410 and the outer ring body 420, and can also adjust the distance between the first outer connecting portion 432 and the second inner connecting portion 441.

[0096] Moreover, when the inner ring body 410 and the outer ring body 420 move relative to each other and the first connecting rod 430 and the second connecting rod 440 undergo elastic deformation, the stress inside the first connecting rod 430 and the second connecting rod 440 usually concentrates on the second outer connecting portion 442 and the second inner connecting portion 441. Therefore, setting the arc curvature radii of the fourth arc segment 4414 and the eighth arc segment 4324 to be associated with the width of the curved extension portion 443 or the straight bar extension portion 433 can correspondingly adjust the stability at the first outer connecting portion 432 and the second inner connecting portion 441, so as to be able to further control the position where the strengthening stress concentrates, thereby making it less likely for the first outer connecting portion 432 and the second inner connecting portion 441 to break due to stress concentration, and thus improving the stability of the vibration transmission piece 400.

[0097] If the ratio of the connection length between the centers of the fourth arc segment 4414 and the eighth arc segment 4324 to the width of the curved extension portion 443 is less than 3.71, or the ratio to the width of the straight bar extension portion 433 is less than 3.71, it will result in too small arc curvature radii of the fourth arc segment 4414 and the eighth arc segment 4324, or too small distance between the fourth arc segment 4414 and the eighth arc segment 4324. Additionally, when the first connecting rod 430 and the second connecting rod 440 undergo elastic deformation, it may cause the internal stress to concentrate at the second outer connecting portion 442 and the second inner connecting portion 441, thereby easily causing fractures at the connections between the first connecting rod 430 and the inner ring body 410 and the outer ring body 420, and also easily causing fractures at the connections between the second connecting rod 440 and the inner ring body 410 and the outer ring body 420.

[0098] If the ratio of the connection length between the center of the fourth arc segment 4414 and the center of the eighth arc segment 4324 to the width of the curved extension 443 is greater than 4.54, or the ratio to the width of the straight bar extension 433 is greater than 4.54, it will result in too large an arc curvature radius for the fourth arc segment 4414 and the eighth arc segment 4324, a relatively large width at the second outer connection 442 and the second inner connection 441, or too large a distance between the fourth arc segment 4414 and the eighth arc segment 4324, which is not conducive to the relative movement between the inner ring body 410 and the outer ring body 420, and further affects the vibration sensitivity of the vibration transmission piece 400.

[0099] Therefore, setting the ratio of the connection length between the center of the fourth arc segment 4414 and the center of the eighth arc segment 4324 to the width of the curved extension 443 or the straight bar extension 433 to be between 3.71 and 4.54 can, while maintaining the vibration sensitivity of the vibration transmission piece 400, strengthen the connection strength between the second outer connection 442 and the second inner connection 441, so that the second outer connection 442 and the second inner connection 441 are not easily broken due to stress concentration, thereby improving the radial stiffness of the vibration transmission piece 400 to enhance the stability and reliability of the vibration transmission piece 400. For example, the ratio of the connection length between the center of the fourth arc segment 4414 and the center of the eighth arc segment 4324 to the width of the curved extension 443 or the straight bar extension 433 can be numerical values such as 3.862, 4.12, or 4.374.

[0100] In some embodiments, the width range of the curved extension 443 can be between the width value of the straight bar extension 433 and the width value of the inner ring body 410. Such a setting can make the curved extension 443 not easily affect the vibration sensitivity of the vibration transmission piece 400.

[0101] Optionally, in some embodiments, the width of the curved extension 443 can be the same as the width of the straight bar extension 433, and the width of the curved extension 443 and the width of the straight bar extension 433 can both be less than the width of the inner ring body 410, so as to further ensure the vibration sensitivity of the vibration transmission piece 400. For example, the width of the curved extension 443 and the width of the straight bar extension 433 can both be numerical values such as 0.3 mm, 0.34 mm, 0.4 mm, or 0.45 mm.

[0102] In some embodiments, the ratio of the diameter of the seventh arc segment 4323 to the diameter of the inner edge of the curved extension 443 and the ratio of the diameter of the eighth arc segment 4324 to the diameter of the inner edge of the curved extension 443 are between 0.16 and 0.2.

[0103] With such a setting, the shapes of the seventh arc segment 4323 and the eighth arc segment 4324 can be similar to those of the third arc segment 4413 and the fourth arc segment 4414 and correspond to each other. Similarly, the ratio of the diameter of the seventh arc segment 4323 to the diameter of the inner edge of the curved extension 443 and the ratio of the diameter of the eighth arc segment 4324 to the diameter of the inner edge of the curved extension 443 are between 0.16 and 0.2, which can disperse the stress at the first outer connection portion 432, thereby improving the reliability of the vibration transmission piece 400.

[0104] For example, the ratio of the diameter of the seventh arc segment 4323 to the diameter of the inner edge of the curved extension 443 and the ratio of the diameter of the eighth arc segment 4324 to the diameter of the inner edge of the curved extension 443 can be set to values such as 0.1732, 0.181, or 0.1957.

[0105] In some embodiments, the diameters of the third arc segment 4413, the fourth arc segment 4414, the seventh arc segment 4323, and the eighth arc segment 4324 are the same. With such a setting, the first outer connection portion 432 and the second inner connection portion 441 can present similar shapes, so that when the first outer connection portion 432 and the second inner connection portion 441 undergo elastic deformation, the internal stresses of the two are more balanced, the stress difference between the two can be reduced, and thus the reliability and service life of the vibration transmission piece 400 can be improved.

[0106] Of course, in other embodiments, the diameters of the third arc segment 4413, the fourth arc segment 4414, the seventh arc segment 4323, and the eighth arc segment 4324 can be set to be different, or the third arc segment 4413 and the fourth arc segment 4414 can be set to be the same, and the seventh arc segment 4323 and the eighth arc segment 4324 can be set to be the same. This embodiment is not specifically limited herein.

[0107] In some embodiments, as Figure 6 shown, the straight-line distance from the connection point of the fifth arc segment 4321 and the first outer ring edge 421 to the connection point of the seventh arc segment 4323 and the first outer ring edge 421 is greater than the straight-line distance from the connection point of the first arc segment 4411 and the first inner ring edge 411 to the connection point of the third arc segment 4413 and the first inner ring edge 411.

[0108] Specifically, the straight-line distance from the connection point of the fifth arc segment 4321 and the first outer ring edge 421 to the connection point of the seventh arc segment 4323 and the first outer ring edge 421 is as Figure 6 shown by the length H2 in

[0109] Among them, the straight-line distance from the connection point of the fifth arc segment 4321 and the first outer ring edge 421 to the connection point of the seventh arc segment 4323 and the first outer ring edge 421 is the width of the connection part of the first connecting rod 430 and the first outer ring edge 421. And the straight-line distance from the connection point of the first arc segment 4411 and the first inner ring edge 411 to the connection point of the third arc segment 4413 and the first inner ring edge 411 refers to the width of the connection part of the second connecting rod 440 and the first inner ring edge 411.

[0110] Since the first outer ring edge 421 is located outside the first inner ring edge 411, when the inner ring body 410 and the outer ring body 420 move relative to each other, the movement amplitude of the first outer ring edge 421 will be greater, so a greater restraining force is required to restrain the outer ring body 420. Therefore, setting the straight-line distance from the connection point of the fifth arc segment 4321 and the first outer ring edge 421 to the connection point of the seventh arc segment 4323 and the first outer ring edge 421 to be greater than the straight-line distance from the connection point of the first arc segment 4411 and the first inner ring edge 411 to the connection point of the third arc segment 4413 and the first inner ring edge 411 can strengthen the restraint and connection strength of the outer ring body 420, thereby improving the reliability of the vibration transmission piece 400.

[0111] In some embodiments, the ratio of the straight-line distance from the connection point of the fifth arc segment 4321 and the first outer ring edge 421 to the connection point of the seventh arc segment 4323 and the first outer ring edge 421 to the width of the straight bar extension part 433 is between 3.17 and 3.88.

[0112] Setting the width of the connection part of the first outer connection part 432 and the first outer ring edge 421 corresponding to the width of the straight bar extension part 433 can more precisely adjust the connection strength of the connection part of the first outer connection part 432 and the first outer ring edge 421.

[0113] Specifically, if the ratio of the straight-line distance between the connection point of the fifth arc segment 4321 and the first outer ring edge 421 to the connection point of the seventh arc segment 4323 and the first outer ring edge 421 to the width of the straight bar extension 433 is set to be less than 3.17, the connection between the first outer connection portion 432 and the first outer ring edge 421 will be relatively weak, and the first outer connection portion 432 is likely to break when undergoing elastic deformation. If the ratio of the above straight-line distance to the width of the straight bar extension 433 is set to be greater than 3.88, the connection between the first outer connection portion 432 and the first outer ring edge 421 will be too wide, and the first outer connection portion 432 will overly restrict the movement of the inner ring body 410, thereby reducing the vibration sensitivity of the vibration transmission sheet 400, reducing the sensitivity of the transducer device 11, and affecting the bone conduction effect of the bone conduction headset 1. Therefore, setting the ratio of the above straight-line distance H2 to the width of the straight bar extension 433 to be between 3.17 and 3.88 can improve the radial stiffness of the vibration transmission sheet 400 while ensuring the sensitivity of the vibration transmission sheet 400.

[0114] For example, the ratio of the straight-line distance between the connection point of the fifth arc segment 4321 and the first outer ring edge 421 to the connection point of the seventh arc segment 4323 and the first outer ring edge 421 to the width of the straight bar extension 433 can be values such as 3.246, 3.52, or 3.751.

[0115] In some embodiments, the first inner connection portion 431 and the second outer connection portion 442 can be set with reference to the shape settings of the first outer connection portion 432 and the second inner connection portion 441, so that both ends of the first link 430 and the second link 440 exhibit similar settings, thereby reducing the stress gap when the first link 430 and the second link 440 undergo elastic deformation, dispersing the stress, reducing the probability of the vibration transmission sheet 400 breaking, and improving the reliability and service life of the vibration transmission sheet 400.

[0116] Based on the above structural settings of the vibration transmission sheet 400, a unidirectional load fatigue simulation can be performed on the vibration transmission sheet 400 to study the distribution of stress and fatigue failure cycle times of the vibration transmission sheet 400 under the above various-direction loads.

[0117] In some embodiments, the interval direction of the two first straight-line segments 4111 can be defined as the width direction of the vibration transmission sheet 400 (i.e., Figure 6 the direction indicated by the X arrow in Figure 6In the direction indicated by the Y arrow in the figure, the axial direction of the vibration transmission piece 400 can be positioned as the thickness direction of the vibration transmission piece 400, wherein the thickness direction of the vibration transmission piece 400 is perpendicular to the width direction and the length direction. Therefore, the loads received by the vibration transmission piece 400 during operation can be classified into a load in the width direction, a load in the length direction, an axial load (i.e., the load in the thickness direction of the vibration transmission piece 400), and a turning load (the load that causes the vibration transmission piece 400 to turn around the width direction).

[0118] Figure 8 is a schematic diagram of the stress distribution of the vibration transmission piece 400 under a load in the length direction, as Figure 8 shown. When the vibration transmission piece 400 is subjected to a unidirectional load in the length direction, the elastic deformation degree of the second connecting rod 440 is relatively large, the stress is concentrated and distributed on the two second connecting rods 440, and the stress is dispersed on the second inner connecting part 441, the second outer connecting part 442, and the curved extension part 443 of the second connecting rod 440, rather than being concentrated at only one point.

[0119] Furthermore, in a test of a fatigue simulation, during the process that the vibration transmission piece 400 bears an alternating stress in the length direction, the result of the fatigue failure cycle number of the vibration transmission piece 400 is 1.28E8. Therefore, the structural setting of the two second connecting rods 440 can reduce stress concentration when the vibration transmission piece 400 bears a load in the length direction, so as to improve the stiffness of the vibration transmission piece 400 in the length direction and improve the service life of the vibration transmission piece 400.

[0120] Figure 9 is a schematic diagram of the stress distribution of the vibration transmission piece 400 under a load in the width direction, as Figure 9 shown. When the vibration transmission piece 400 is subjected to a unidirectional load in the width direction, both the two first connecting rods 430 and the two second connecting rods 440 undergo relatively large elastic deformations, and the stress is concentrated and distributed on the two first connecting rods 430 and the two second connecting rods 440, rather than being concentrated at only one point. Furthermore, in a test of a fatigue simulation, during the process that the vibration transmission piece 400 bears an alternating stress in the width direction, the result of the fatigue failure cycle number of the vibration transmission piece 400 is 9.49E11.

[0121] Therefore, when the vibration transmission piece 400 bears a load in the width direction, each part of the two first connecting rods 430 and the two second connecting rods 440 can share the stress, reduce stress concentration, so as to improve the stiffness of the vibration transmission piece 400 in the width direction and improve the service life of the vibration transmission piece 400.

[0122] Figure 10 and Figure 11 is a schematic diagram of the stress distribution of the vibration transmission piece 400 under an axial load in the axial direction, as Figure 10and Figure 11 As shown, when the vibration transmission piece 400 is subjected to an axial load (i.e., a load in the direction perpendicular to the plane where the vibration transmission piece 400 is located), after the two first linkages 430 and the two second linkages 440 undergo elastic deformation, the stress is distributed in various parts of the two first linkages 430 and the two second linkages 440, rather than concentrated in a certain place. Further, in a fatigue simulation test, during the process that the vibration transmission piece 400 bears an alternating stress in the axial direction, the fatigue failure cycle number result of the vibration transmission piece 400 is 4.04E4.

[0123] Among them, when the bone conduction headset 1 works normally, when the bracket 200 of the voice coil 100 and the magnetic circuit system 300 move relatively, the bracket 200 of the voice coil 100 will drive the inner ring body 410 to move, while the magnetic circuit system 300 will drive the outer ring body 420 to move. At this time, the load received by the vibration transmission piece 400 is the axial load. Therefore, as Figure 10 and Figure 11 can be seen, when the bone conduction headset 1 works normally, the stress of the vibration transmission piece 400 can be distributed in various parts of the two first linkages 430 and the two second linkages 440, thereby improving the stiffness of the vibration transmission piece 400 in the radial direction and improving the reliability and service life of the vibration transmission piece 400.

[0124] Since the bracket 200 is suspended in the middle of the magnetic circuit system 300 through the inner ring body 410, and the dimension of the vibration transmission piece 400 in the length direction is greater than that in the width direction, during the collision or transportation of the bone conduction headset 1, the vibration transmission piece 400 is prone to receive a turning load that turns around the width direction. As Figure 12 shown, Figure 12 is a schematic diagram of the stress distribution of the vibration transmission piece 400 under the turning load that turns around the width direction. When the vibration transmission piece 400 is subjected to the turning load that turns around the width direction, the two first linkages 430 and the two second linkages 440 will both undergo elastic deformation, and the stress of the two first linkages 430 and the two second linkages 440 is relatively evenly distributed in each part.

[0125] Further, in a fatigue simulation test in which the vibration transmission piece 400 bears the turning load that turns around the width direction, the fatigue failure cycle number result of the vibration transmission piece 400 is 5.99E11. Therefore, when the vibration transmission piece 400 bears the turning load, the two first linkages 430 and the two second linkages 440 of the vibration transmission piece 400 can also bear the stress relatively evenly, so as to achieve the effect of improving the service life of the vibration transmission piece 400.

[0126] As can be seen from the above description, the structural arrangement of the vibration transmission piece 400 can effectively disperse stress, reduce the stress concentration and the situation of easy fracture, and can improve the stiffness of the vibration transmission piece 400 in the radial and axial directions of the vibration transmission piece 400, thereby improving the reliability and service life of the vibration transmission piece 400.

[0127] In some embodiments, as Figure 7 shown, the outer ring body 420 has a first outer ring edge 421 adjacent to the inner ring body 410 and a second outer ring edge 422 facing away from the inner ring body 410. A positioning bump 4221 may be provided on the second outer ring edge 422, and the positioning bump 4221 protrudes towards the outside of the vibration transmission piece 400. In other words, the positioning bump 4221 is provided on the side of the second outer ring edge 422 facing away from the inner ring body 410.

[0128] Specifically, the arrangement of providing the positioning bump 4221 on the second outer ring edge 422 and the positioning bump 4221 being able to protrude towards the outside of the vibration transmission piece 400 can enable the vibration transmission piece 400 to be positioned in the jig for assembling the transducer device 11 through the positioning bump 4221 during the installation of the transducer device 11, thereby facilitating the subsequent installation of other components such as the bracket 200 and the magnetic circuit system 300 on the vibration transmission piece 400. During the installation process, after the vibration transmission piece 400 needs to be positioned on the jig, it is further connected to other components of the speaker assembly 10. Through the arrangement of the positioning bump 4221, the positioning accuracy can be improved, so as to facilitate the vibration transmission piece 400 to be more accurately positioned in cooperation with the jig, and can also reduce the situation of the vibration transmission piece 400 shaking in the jig, so as to improve the assembly efficiency and assembly effect of the transducer device 11.

[0129] In some embodiments, as Figure 7 shown, the second outer ring edge 422 may include two first sub-straight line segments 4222 arranged side by side and facing away from each other, and two first sub-curve segments 4223 respectively connecting the adjacent ends of the two first sub-straight line segments 4222 and protruding towards the outside of the vibration transmission piece 400. Optionally, the two first sub-straight line segments 4222 may correspond to two second straight line segments 4211 of the first outer ring edge 421, and the two first sub-curve segments 4223 may correspond to two first curve segments 4112 of the first outer ring edge 421.

[0130] Among them, the positioning bump 4221 can be arranged on the first sub-straight segment 4222. The arrangement that the positioning bump 4221 can be arranged on the first sub-straight segment 4222 instead of the first sub-curved segment 4223 can facilitate the formation of the positioning bump 4221. The difficulty of arranging the positioning bump 4221 on the first sub-curved segment 4223 is greater than that on the first sub-straight segment 4222. Moreover, chamfering processing is required for arranging the positioning bump 4221 on the first sub-curved segment 4223. Thus, arranging the positioning bump 4221 on the curved segment 4223 can minimize the influence on the shape of the first sub-curved segment 4223.

[0131] Certainly, in other embodiments, the positioning bump 4221 can also be arranged on the curved segment 4223, and this embodiment does not make specific limitations here.

[0132] In some embodiments, as Figure 7 shown, the first sub-straight segment 4222 can also be provided with a positioning slot 4224 that is recessed towards the inner ring body 410. The positioning slot 4224 and the positioning bump 4221 are staggered from each other along the circumferential direction of the second outer ring edge 422. When observing the transducer device 11 along the axis of the transducer device 11, the positioning slot 4224 can expose a part of the magnetic circuit system 300, so that a part of the magnetic circuit system 300 is not covered by the vibration transmission piece 400. The axis of the transducer device 11 can be perpendicular to the radial direction of the bracket 200 or parallel to the vibration direction of the bracket 200.

[0133] Optionally, as Figure 4 shown, the transducer device 11 can further include a clip 500. The clip 500 can clamp the exposed part of the magnetic circuit system 300 so that the magnetic circuit system 300 is not easily scattered during vibration, at the position corresponding to the positioning slot 4224 of the exposed part of the magnetic circuit system 300. When observing the transducer device 11 along the axis of the transducer device 11, the clip 500 is staggered from the vibration transmission piece 400 through the positioning slot 4224. Therefore, the clip 500 is also misaligned with the positioning bump 4221.

[0134] In some embodiments, as Figure 7 shown, the positioning bump 4221 can be located at the edge of the positioning slot 4224. When observing along the thickness direction of the vibration transmission piece 400, the edge of the side of the positioning bump 4221 close to the positioning slot 4224 and the groove wall of the positioning slot 4224 are on a straight line and form a first straight line 4225. Thus, arranging the positioning bump 4221 on one side wall of the positioning slot 4224 can facilitate the formation of the positioning bump 4221. The positioning slot 4224 can be used to position and add the positioning bump 4221 to reduce the processing difficulty of the vibration transmission piece 400.

[0135] Of course, in other embodiments, the positioning bump 4221 may be located at other positions on the first sub-straight segment 4222. For example, it may be located 1 cm or 0.5 cm away from the positioning slot 4224, etc. Specific examples are not listed one by one in this embodiment.

[0136] In some embodiments, as Figure 7 shown, the first straight line 4225 may be perpendicular to the first sub-straight segment 4222. This setting not only facilitates the formation of the positioning slot 4224 and the positioning bump 4221, but also enables the positioning slot 4224 to further restrict the movement of the magnetic circuit system 300 by restricting the clamping clip 500, so that the magnetic circuit system 300 is not easily misaligned.

[0137] In some embodiments, as Figure 7 shown, the positioning bump 4221 may be rectangular. Optionally, one side of the rectangular positioning bump 4221 is fixedly connected to the first outer ring edge 421, and the other three edges extend beyond the first outer ring edge 421 for positioning in cooperation with the jig for assembling the transducer device 11. The rectangular positioning bump 4221 is easy to form and can also improve the positioning accuracy.

[0138] Of course, in other embodiments, the positioning bump 4221 may also be circular, conical or other shapes, and specific examples are not listed one by one in this embodiment.

[0139] In some embodiments, as Figure 7 shown, positioning bumps 4221 may be provided on both sides of the positioning slot 4224 respectively. The setting of multiple positioning bumps 4221 can further improve the positioning accuracy, but may also cause the positioning bumps 4221 to be broken during the positioning process in cooperation with the jig.

[0140] In some embodiments, as Figure 7 shown, the number of the positioning slots 4224 and the positioning bumps 4221 is two groups, and they are respectively provided on two first sub-straight segments 4222.

[0141] Optionally, the two groups of positioning slots 4224 and the two groups of positioning bumps 4221 may be axially symmetrically arranged to achieve positioning in cooperation with the jig on both sides in the interval direction of the two first sub-straight segments 4222, thereby further improving the positioning accuracy.

[0142] For example, as Figure 7As shown, a set of positioning slots 4224 may have one positioning slot 4224, and a set of positioning bumps 4221 may have two positioning bumps 4221. The two positioning bumps 4221 are respectively located on both sides of the positioning slot 4224, and the side edges of the two positioning bumps 4221 close to the positioning slot 4224 are in natural transition with the two slot walls of the positioning slot 4224 and are located on the same straight line.

[0143] Optionally, each set of positioning slots 4224 and positioning bumps 4221 is centered relative to the first sub-straight line segment 4222 along the extension direction of the first sub-straight line segment 4222. With such a setting, the positioning slots 4224 and positioning bumps 4221 being centered on the first sub-straight line segment 4222 not only facilitates the positioning to form the positioning slots 4224 and positioning bumps 4221, but also enables the vibration transmission sheet 400 to be evenly stressed when assembling the transducer device 11, so that the length of the first sub-straight line segment 4222 can be reduced, and further the size of the vibration transmission sheet 400 can be reduced.

[0144] In some embodiments, the protruding length of the positioning bump 4221 relative to the second outer ring edge 422 may be between 0.315 mm and 0.385 mm, and the width relative to the second outer ring edge 422 may be between 0.378 mm and 0.462 mm. Among them, the protruding length of the positioning bump 4221 relative to the second outer ring edge 422 may be as shown by the length K1 in Figure 7 and the width of the positioning bump 4221 relative to the second outer ring edge 422 may be as shown by the length K2 in Figure 7 as shown.

[0145] Specifically, if the protruding length of the positioning bump 4221 relative to the second outer ring edge 422 is less than 0.315 mm, it is not easy for the positioning bump 4221 to cooperate with the jig for positioning, and its positioning accuracy is too low. If the protruding length of the positioning bump 4221 relative to the second outer ring edge 422 is greater than 0.385 mm, it will affect the size of the transducer device 11. When assembling the transducer device 11 in the speaker assembly 10, more space needs to be reserved to accommodate the longer positioning bump 4221, which will thus affect the size of the earphone. Therefore, setting the protruding length of the positioning bump 4221 relative to the second outer ring edge 422 between 0.315 mm and 0.385 mm can improve the positioning accuracy while the vibration transmission sheet 400 retains a narrow size in the interval direction of the two first sub-straight line segments 4222.

[0146] Similarly, if the width of the positioning bump 4221 relative to the second outer ring edge 422 is less than 0.378 mm, it is difficult for the positioning bump 4221 to cooperate with the fixture for positioning, and its positioning accuracy is too low. If the width of the positioning bump 4221 relative to the second outer ring edge 422 is greater than 0.462 mm, it will affect the length setting of the first sub-straight segment 4222. Therefore, setting the width of the positioning bump 4221 relative to the second outer ring edge 422 between 0.378 mm and 0.462 mm can also improve the positioning accuracy while keeping the size of the vibration transmission sheet 400 narrow in the extending direction of the first sub-straight segment 4222.

[0147] For example, the protruding length of the positioning bump 4221 relative to the second outer ring edge 422 can be set to values such as 0.325 mm, 0.35 mm, or 0.375 mm, and the width relative to the second outer ring edge 422 can be set to values such as 0.395 mm, 0.42 mm, or 0.457 mm.

[0148] In summary, in the present application, a positioning bump 4221 is provided on the second outer ring edge 422 of the vibration transmission sheet 400, and the positioning bump 4221 can protrude outward from the vibration transmission sheet 400. This enables the vibration transmission sheet 400 to be positioned in the assembly fixture through the positioning bump 4221 during installation, thereby improving the positioning accuracy of the vibration transmission sheet 400 in the assembly fixture, facilitating more accurate positioning of the vibration transmission sheet 400 with the fixture, reducing the situation of the vibration transmission sheet 400 shaking in the assembly fixture, and also facilitating the subsequent installation of other components on the vibration transmission sheet 400 to improve the assembly efficiency and assembly effect of the speaker assembly 10.

[0149] The above are only embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.

Claims

1. A vibration transmission sheet, characterized in that: The vibration transmission plate comprises an inner ring body, an outer ring body surrounding the outer periphery of the inner ring body, and a first connecting rod and a second connecting rod connected between the inner ring body and the outer ring body; the outer ring body has a first outer ring edge arranged adjacent to the inner ring body and a second outer ring edge arranged away from the inner ring body; A positioning protrusion is arranged on the edge of the second outer ring, and the positioning protrusion protrudes toward the outside of the vibration transmission plate.

2. The vibration transmission sheet according to claim 1, characterized in that: The second outer ring edge includes two first sub-straight segments arranged side by side and back to back and two first sub-curved segments respectively connecting adjacent ends of the two first sub-straight segments and protruding toward the outside of the vibration transmission plate; the positioning protrusion is arranged on the first sub-straight segment.

3. The vibration transmission sheet according to claim 2, characterized in that: The first sub-straight line segment is also provided with a positioning groove recessed toward the inner ring body; the positioning groove and the positioning protrusion are staggered with each other along the circumferential direction of the edge of the second outer ring.

4. The vibration transmission sheet according to claim 3, characterized in that: The positioning protrusion is located at the edge of the positioning groove. When observed along the direction perpendicular to the main surface of the outer ring body, the edge of one side of the positioning protrusion close to the positioning groove is located in a straight line with the groove wall of the positioning groove and forms a first straight line.

5. The vibration transmission sheet according to claim 4, characterized in that: The first straight line is arranged perpendicular to the first sub-straight line segment.

6. The vibration transmission sheet according to claim 4, characterized in that: The positioning protrusion is arranged in a rectangular shape.

7. The vibration transmission sheet according to claim 4, characterized in that: The positioning protrusions are respectively arranged on both sides of the positioning groove.

8. The vibration transmission sheet according to claim 7, characterized in that: The number of the positioning slots and the positioning protrusions is two groups, and they are respectively arranged on the two first sub-straight line segments.

9. The vibration transmission sheet according to claim 7, characterized in that: Each group of the positioning grooves and positioning protrusions is centrally arranged relative to the first sub-straight line segment along the extension direction of the first sub-straight line segment.

10. The vibration transmission sheet according to any one of claims 1 to 9, characterized in that: The protruding length of the positioning protrusion relative to the second outer ring edge is between 0.315 mm and 0.385 mm, and the width of the positioning protrusion relative to the second outer ring edge is between 0.378 mm and 0.462 mm.

11. A speaker assembly, characterized in that: The speaker assembly includes a transducer device, which includes a voice coil, a bracket, a magnetic circuit system and a vibration transmission plate as described in any one of claims 1 to 10, wherein the inner ring body of the vibration transmission plate is connected to the bracket, and the outer ring body is connected to the magnetic circuit system so as to elastically suspend the magnetic circuit system on the periphery of the bracket, and the voice coil is arranged on the bracket.

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