Vibration transmission sheet, loudspeaker assembly and bone conduction earphone

Abstract

The utility model mainly relates to a vibration transmission sheet, a loudspeaker assembly and a bone conduction earphone. The loudspeaker assembly comprises an inner ring body, an outer ring body, a first connecting rod and a second connecting rod, the inner ring body is provided with a first inner ring edge, the first inner ring edge comprises two first straight line sections and two first curve sections, the outer ring body is provided with a first outer ring edge, the first outer ring edge comprises two second straight line sections and two second curve sections, and straight strip gaps are formed between the first straight line sections and the second straight line sections; a curved gap is formed between the first curve section and the second curve section; the first connecting rod comprises a first inner connecting part, a first outer connecting part connected with the first outer ring edge and a straight strip extending part located in the straight strip gap. The second connecting rod comprises a second inner connecting part, a second outer connecting part and a curved extending part located in the curved gap. Through the arrangement, the rigidity of the vibration transmission sheet can be increased, the reliability of the vibration transmission sheet is improved, and the service life of the vibration transmission sheet is prolonged.

Description

Technical Field

[0001] The present application relates to the field of acoustic technology, and in particular to a vibration transmission sheet, a speaker assembly and a bone conduction earphone. 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. Current bone conduction headphones are usually equipped with magnetic circuits and circuits that can generate electromagnetic induction so that the headphones can vibrate to achieve bone conduction, and a vibration transmission plate is set in the bone conduction headphones to connect the magnetic circuit and the circuit to relatively limit the position of the two, but the mutual movement between the two can easily cause the vibration transmission plate to be damaged, deformed, and broken. Utility Model Content

[0003] The present application provides a transducer, a speaker assembly, and a bone conduction earphone, which can increase the rigidity of the transducer, improve the reliability of the transducer, and thus increase the service life of the transducer.

[0004] 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 inner ring body has a first inner ring edge arranged adjacent to the outer ring body, the first inner ring edge includes two first straight line segments arranged side by side and opposite to each other, and two first curved segments respectively connecting adjacent ends of the two first straight line segments and protruding toward the outside of the vibration transmission plate, the outer ring body has a first outer ring edge arranged adjacent to the inner ring body, the first outer ring edge includes two second straight line segments respectively located outside the two first straight line segments, and two second curved segments respectively located outside the two first curved segments, so as to form a straight gap between adjacent first straight line segments and second straight line segments, and to form a curved gap between adjacent first curved segments and second curved segments;

[0005] The first connecting rod includes a first inner connecting portion connected to the edge of the first inner ring, a first outer connecting portion connected to the edge of the first outer ring, and a straight extension portion connected between the first inner connecting portion and the first outer connecting portion and located in the straight gap; the second connecting rod includes a second inner connecting portion connected to the edge of the first inner ring, a second outer connecting portion connected to the edge of the first outer ring, and a curved extension portion connected between the second inner connecting portion and the second outer connecting portion and located in the curved gap.

[0006] In some embodiments, the number of the first connecting rods and the number of the second connecting rods are two respectively, and the two first connecting rods and the two second connecting rods are 180 degrees rotationally symmetric relative to the centroid or the center of mass of the inner ring body.

[0007] In some embodiments, the first inner connection portion is disposed adjacent to the second outer connection portion, and the first outer connection portion is disposed adjacent to the second inner connection portion.

[0008] In some embodiments, the inner and outer edges of the first curved segment, the second curved segment and the curved extension are respectively arranged in arc shapes with the same center, and the inner and outer edges of the first straight segment, the second straight segment and the straight extension are arranged parallel to each other.

[0009] In some embodiments, the inner edge of the curved extension portion is arranged in an arc shape, and the inner edge of the second inner connecting portion includes a first arc segment connected to the first inner ring edge and a second arc segment connecting the first arc segment and the inner edge of the curved extension portion, the ratio of the diameter of the first arc segment to the diameter of the inner edge of the curved extension portion is between 0.02 and 0.03, the ratio of the diameter of the second arc segment to the diameter of the inner edge of the curved extension portion is between 0.11 and 0.14, and the first arc segment and the second arc segment are concave arcs.

[0010] In some embodiments, the outer edge of the second inner connecting portion includes a third arc segment connected to the edge of the first inner ring and a fourth arc segment connecting the third arc segment and the outer edge of the curved extension portion, the ratio of the diameter of the third arc segment to the diameter of the inner edge of the curved extension portion and the ratio of the diameter of the fourth arc segment to the diameter of the inner edge of the curved extension portion are between 0.16 and 0.2, the third arc segment is a concave arc, and the fourth arc segment is a convex arc.

[0011] In some embodiments, a diameter of the fourth arc segment is consistent with a diameter of the third arc segment.

[0012] In some embodiments, the ratio of the straight-line distance from the connection point of the first arc segment and the first inner ring edge to the connection point of the third arc segment and the first inner ring edge to the width of the curved extension portion is between 2.65 and 3.25.

[0013] In some embodiments, the second inner connecting portion is arranged adjacent to the first outer connecting portion, and the outer edge of the first outer connecting portion includes a fifth arc segment connected to the edge of the first outer ring and a sixth arc segment connecting the fifth arc segment and the outer edge of the straight extension portion, the ratio of the diameter of the fifth arc segment to the diameter of the inner edge of the curved extension portion is between 0.02 and 0.03, the ratio of the diameter of the sixth arc segment to the diameter of the inner edge of the curved extension portion is between 0.11 and 0.14, and the fifth arc segment and the sixth arc segment are concave arcs.

[0014] In some embodiments, the diameter of the fifth arc segment is consistent with the diameter of the first arc, and the diameter of the sixth arc segment is consistent with the diameter of the second arc.

[0015] In some embodiments, the inner edge of the first outer connecting portion includes a seventh arc segment connected to the edge of the first outer ring and an eighth arc segment connecting the seventh arc segment and the inner edge of the straight extension portion. The line between the center of the fourth arc segment and the center of the eighth arc segment has a midpoint. The angle formed by the line between the midpoint and the center of the inner edge of the curved extension portion and the spacing direction of the two first straight line segments is between 8° and 18°. The seventh arc segment is a concave arc, and the eighth arc segment is a convex arc.

[0016] In some embodiments, the angle is between 11° and 15°.

[0017] In some embodiments, the ratio of the connection length between the center of the fourth arc segment and the center of the eighth arc segment to the width of the curved extension portion or the straight extension portion is between 3.71 and 4.54.

[0018] In some embodiments, the width of the curved extension portion ranges between the width of the straight extension portion and the width of the inner ring body.

[0019] In some embodiments, a ratio of the diameter of the seventh arc segment to the diameter of the inner edge of the curved extension portion and a ratio of the diameter of the eighth arc segment to the diameter of the inner edge of the curved extension portion are between 0.16 and 0.2.

[0020] In some embodiments, the diameters of the third arc segment, the fourth arc segment, the seventh arc segment, and the eighth arc segment are consistent.

[0021] In some embodiments, the straight-line distance from the connection point of the fifth arc segment and the first outer ring edge to the connection point of the seventh arc segment and the first outer ring edge is greater than the straight-line distance from the connection point of the first arc segment and the first inner ring edge to the connection point of the third arc segment and the first inner ring edge.

[0022] In some embodiments, the ratio of the straight-line distance from the connection point of the fifth arc segment and the first outer ring edge to the connection point of the seventh arc segment and the first outer ring edge to the width of the straight extension portion is between 3.17 and 3.88.

[0023] In some embodiments, the connection between the first connecting rod and the first inner ring edge and the first outer ring edge is a smooth transition connection; the connection between the second connecting rod and the first inner ring edge and the first outer ring edge is also a smooth transition connection.

[0024] On the other hand, the present application provides a speaker assembly, which includes a transducer device, the transducer device includes a voice coil, a bracket, a magnetic circuit system and a vibration transmission plate as described in the above embodiment, 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 that the magnetic circuit system is elastically suspended on the periphery of the bracket, and the voice coil is arranged on the bracket.

[0025] On the other hand, the present application provides a bone conduction headset, which includes a vibration transmission piece as described in the above embodiment.

[0026] The beneficial effect of the present application is: different from the prior art, the present application arranges a first connecting rod and a second connecting rod to connect the inner ring body and the outer ring body, and the first connecting rod is arranged in the straight gap between the inner ring body and the outer ring body, and the first connecting rod is provided with a straight extension portion corresponding to the straight gap and the straight shape of the inner ring body and the outer ring body, and the second connecting rod is arranged in the curved gap between the inner ring body and the outer ring body, and the second connecting rod is provided with a curved extension portion corresponding to the curved gap and the curved shape of the inner ring body and the outer ring body. Therefore, the matching design of the first connecting rod and the second connecting rod corresponding to the shape of the inner ring body and the outer ring body can increase the lateral stiffness while maintaining the sensitivity of the relative movement of the two when the inner ring body moves relative to the outer ring body, so that the first connecting rod and the second connecting rod are not easy to break, thereby improving the reliability of the vibration transmission plate and improving the life of the vibration transmission plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of an embodiment of a bone conduction headset provided by the present application;

[0028] Figure 2 is a schematic diagram of the overall structure of an embodiment of a speaker assembly provided by the present application;

[0029] Figure 3 is a schematic diagram of the overall structure of an embodiment of a transducer device provided by the present application;

[0030] Figure 4 yes Figure 2 The schematic cross-sectional structure diagram of the energy conversion device embodiment shown is along the AA cutting direction;

[0031] Figure 5 It is a schematic diagram of the overall structure of an embodiment of the vibration transmission piece provided by the present application;

[0032] Figure 6 yes Figure 5 An enlarged schematic diagram of the Q region in the vibration transmission sheet embodiment shown;

[0033] Figure 7 yes Figure 5 Another overall structural schematic diagram of the vibration transmission plate embodiment shown;

[0034] Figure 8 yes Figure 5 The schematic diagram of stress distribution of the vibration transmission plate embodiment shown is subjected to load along the length direction;

[0035] Fig. 9 yes Figure 5 A schematic diagram of stress distribution of the vibration transmission plate embodiment shown in FIG. 1 under a load along the width direction;

[0036] Fig.10 yes Figure 5 A schematic diagram of stress distribution of the vibration transmission plate embodiment shown in FIG. 1 under an axial load in the axial direction;

[0037] Fig.11 yes Figure 5 Another schematic diagram of stress distribution of the vibration transmission plate embodiment shown in FIG. 1 under an axial load in the axial direction;

[0038] Fig.12 yes Figure 5 The stress distribution diagram of the vibration transmission plate embodiment shown is a schematic diagram of the stress distribution when it is subjected to an overturning load around the width direction. DETAILED DESCRIPTION

[0039] The present application is further described in detail below in conjunction with the accompanying drawings and examples. It is particularly noted that the following examples are only used to illustrate the present application, but are not intended to limit the scope of the present application. Similarly, the following examples are only some embodiments of the present application rather than all embodiments, and all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of this application.

[0040] Reference to "embodiment" in this application means that a specific feature, structure or characteristic described in conjunction with the embodiment may be included in at least one embodiment of this application. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0041] The following is an exemplary description of a bone conduction headset according to a bone conduction headset embodiment.

[0042] The bone conduction earphone 1 is an earphone that can generate bone conduction sound by bone conduction vibration and transmit the bone conduction sound to the user. Figure 1 As shown, the bone conduction earphone 1 may include a speaker assembly 10, which may be placed in the facial area in front of the tragus of the left ear and / or right ear of the user and fit the facial area of ​​the user. The speaker assembly 10 is used to convert the electrical signal containing relevant audio information into air conduction sound and / or into bone conduction sound, and further conduct the bone conduction sound to the user.

[0043] In some embodiments, the bone conduction headset 1 may further include a wearing component 20 and a microphone component 30. The number of the speaker components 10 may be two, one of which 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 component 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.

[0044] The wearing component 20 can be connected to two speaker components 10 respectively. The wearing component 20 can position the speaker component 10 in the facial area in front of the user's tragus. The two speaker components 10 can be the same or different. For example, one speaker component 10 can be provided with a stick microphone component 30, while the other speaker component 103 can be not provided with a stick microphone component 30. For example, one speaker component 10 is used to transmit bone conduction sound to the user, while the other speaker component 103 is used to transmit air conduction sound to the user.

[0045] In some embodiments, Figure 2 As shown, the speaker assembly 10 may include a transducer device 11 , which is a main device in the speaker assembly 10 for converting electrical signals into bone conduction sounds.

[0046] Alternatively, if Figure 3 as well as Figure 4 As shown, the transducer device 11 may include a voice coil 100, a bracket 200, a magnetic circuit system 300 and a vibration transmission plate 400. The vibration transmission plate 400 connects the bracket 200 and the magnetic circuit system 300 to elastically suspend the magnetic circuit system 300 on the periphery of 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 receives 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.

[0047] The voice coil 100 can receive an electrical signal containing relevant audio information, and the bracket 200 can be disposed 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 receiving the 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 interfered 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.

[0048] Specifically, since the voice coil 100 is opposite to the magnetic circuit system 300 in the radial direction of the transducer device 11, the electric field of the voice coil 100 and the magnetic field of the magnetic circuit system 300 can interact with each other, thereby generating an electromagnetic reaction, causing the magnetic circuit system 300 and the bracket 200 on which the voice coil 100 is set to move relative to each other, so that the transducer device 11 vibrates and generates bone conduction sound that can transmit relevant audio information.

[0049] The vibration transmission piece 400 can undergo a certain elastic deformation under the action of 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 where the voice coil 100 is set move relative to each other, and the vibration transmission piece 400 can elastically constrain the magnetic circuit system 300 and the bracket 200 where the voice coil 100 is set, so as to confine the bracket 200 in the magnetic circuit system 300, so that the operation of the transducer 11 can remain stable.

[0050] In some embodiments, the vibration transmission plate 400 can be made of metal materials, which can include but are not limited to steel (e.g., stainless steel, carbon steel, etc.), light alloys (e.g., aluminum alloy, beryllium copper, magnesium alloy, titanium alloy, etc.). In some embodiments, the vibration transmission plate 400 can also be made of other single or composite materials that can achieve the same performance. For example, composite materials can include but are not limited to reinforcing materials such as glass fiber, carbon fiber, boron fiber, graphite fiber, silicon carbide fiber or aramid fiber.

[0051] In some embodiments, Figure 5 As shown, the vibration transmission piece 400 may include an inner ring body 410 , an outer ring body 420 surrounding the inner ring body 410 , and a first connecting rod 430 and a second connecting rod 440 connected between the inner ring body 410 and the outer ring body 420 .

[0052] Among them, the inner ring body 410 of the vibration transmission piece 400 is connected to the bracket 200, the outer ring body 420 is connected to the magnetic circuit system 300, and the first connecting rod 430 and the second connecting rod 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 connecting rod 430 and the second connecting rod 440 can undergo elastic deformation, which can support the inner ring body 410 and the outer ring body 420 to move relative to each other, and can also constrain the inner ring body 410 and the outer ring body 420, so that the bracket 200 and the magnetic circuit system 300 are not easy to separate from each other, but the first connecting rod 430 and the second connecting rod 440 are also subjected to greater tension.

[0053] Specifically, Figure 5As shown, the inner ring body 410 may have a first inner ring edge 411 arranged adjacent to the outer ring body 420, and the first inner ring edge 411 may include two first straight line segments 4111 and two first curved segments 4112. The two first straight line segments 4111 are arranged side by side and back to back with each other, and the two first curved segments 4112 respectively connect the adjacent ends of the two first straight line segments 4111 and protrude toward the outside of the vibration transmission plate 400. The outer ring body 420 may have a first outer ring edge 421 arranged adjacent to the inner ring body 410. The first outer ring edge 421 may include two second straight line segments 4211 and two second curved segments 4212. The two second straight line segments 4211 are respectively located on the outside of the two first straight line segments 4111, and the two second curved segments 4212 are respectively located on the outside of the two first curved segments 4112, thereby forming a straight gap 401 between adjacent first straight line segments 4111 and second straight line segments 4211, and forming a curved gap 402 between adjacent first curved segments 4112 and second curved segments 4212.

[0054] Among them, the first connecting rod 430 and the second connecting rod 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 under the drive of the bracket 200 and the magnetic circuit system 300, the first connecting rod 430 and the second connecting rod 440 can more stably connect the inner ring body 410 and the outer ring body 420.

[0055] Specifically, Figure 5 As shown, the first connecting rod 430 may include a first inner connecting portion 431 connected to the first inner ring edge 411 , a first outer connecting portion 432 connected to the first outer ring edge 421 , and a straight bar extending portion 433 connected between the first inner connecting portion 431 and the first outer connecting portion 432 and located in the straight bar gap 401 .

[0056] like Figure 5 As shown, the second connecting rod 440 may include a second inner connecting portion 441 connected to the first inner ring edge 411 , a second outer connecting portion 442 connected to the first outer ring edge 421 , and a curved extension portion 443 connected between the second inner connecting portion 441 and the second outer connecting portion 442 and located in the curved gap 402 .

[0057] The first connecting rod 430 is set corresponding to the first straight line segment 4111 and the second straight line segment 4211, and the second connecting rod 440 is set corresponding to the first curved segment 4112 and the second curved segment 4212. Such a setting can reduce the influence of the first connecting rod 430 and the second connecting rod 440 on the mutual movement of the inner ring body 410 and the outer ring body 420, so that when the inner ring body 410 moves relative to the outer ring body 420, the sensitivity of the relative movement of the inner ring body 410 and the outer ring body 420 can be maintained, so as to improve the effect of the bone conduction vibration transmitting bone conduction sound of the bone conduction earphone 1, and at the same time, the radial direction (such as the radial direction) of the vibration transmitting plate 400 can be increased. Figure 5 The rigidity in the direction perpendicular to the thickness direction of the vibration transmission piece 400 is increased so that the first connecting rod 430 and the second connecting rod 440 are not easily broken, thereby improving the reliability and life of the vibration transmission piece 400.

[0058] In some embodiments, Figure 5 As shown, the number of the first connecting rod 430 and the second connecting rod 440 can be two respectively, and the two first connecting rods 430 and the two second connecting rods 440 are 180 degrees rotationally symmetrical relative to the centroid or mass center of the inner ring body 410. In other words, the two first connecting rods 430 and the two second connecting rods 440 are spaced apart from each other in the circumferential direction of the inner ring body 410, the two first connecting rods 430 are arranged relative to each other in the spacing direction of the two first straight line segments 4111, and the two second connecting rods 440 are arranged relative to each other in the spacing direction of the two first curved line segments 4112. The spacing direction of the two first straight line segments 4111 is as shown in FIG. Figure 5 In the direction indicated by the X arrow, the spacing direction of the two first curved segments 4112 is as follows Figure 5 The direction indicated by the X arrow and the direction indicated by the Y arrow may be perpendicular to the radial direction of the vibration transmission sheet 400.

[0059] The two first connecting rods 430 can correspond to the two first straight line segments 4111 and the two second straight line segments 4211, and the two second connecting rods 440 can correspond to the two first curved segments 4112 and the two second curved segments 4212. Such a setting can make the connection between the inner ring body 410 and the outer ring body 420 more stable, so as to increase the rigidity of the vibration transmission plate 400, and improve the reliability and life of the vibration transmission plate 400.

[0060] In some embodiments, Figure 5 As shown, the first inner connection portion 431 and the second outer connection portion 442 may be disposed adjacent to each other in the circumferential direction of the vibration transmission plate 400 , and the first outer connection portion 432 and the second inner connection portion 441 may be disposed adjacent to each other in the circumferential direction of the vibration transmission plate 400 .

[0061] Since the first connecting rod 430 is connected to the first inner ring edge 411 through the first inner connecting portion 431 and to the first outer ring edge 421 through the first outer connecting portion 432, and the second connecting rod 440 is connected to the first outer ring edge 421 through the second outer connecting portion 442 and to the first inner ring edge 411 through the second inner connecting portion 441, the first inner connecting portion 431 and the second inner connecting portion 441 connecting the inner ring body 410 can be arranged non-adjacently but as far away as possible, and the first inner connecting portion 431 and the second inner connecting portion 441 connecting the outer ring body 420 can be arranged non-adjacently but as far away as possible. With such arrangement, the inner ring body 410 and the outer ring body 420 can be pulled and restrained by the first connecting rod 430 and the second connecting rod 440 during relative movement, thereby reducing the stress concentrated 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, thereby reducing the occurrence of breakage of the vibration transmission plate 400 and improving the reliability of the vibration transmission plate 400.

[0062] In some embodiments, Figure 5 As shown, the inner and outer edges of the first curved segment 4112, the second curved segment 4212 and the curved extension portion 443 can be respectively arranged in arc shapes with the same center, and the inner and outer edges of the first straight segment 4111, the second straight segment 4211 and the straight extension portion 433 are arranged parallel to each other.

[0063] Specifically, two ends of the first straight segment 4111 are respectively connected to two first curved segments 4112 , and two ends of the second straight segment 4211 are also respectively connected to two second curved segments 4212 , so that the inner ring body 410 and the outer ring body 420 present an elliptical track shape.

[0064] The curved extension portion 443 is cocentric with the first curved segment 4112 and the second curved segment 4212, and the inner and outer edges of the straight extension portion 433 are parallel to the first straight segment 4111 and the second straight segment 4211. This makes it difficult for the curved extension portion 443 and the straight extension portion 433 to come into contact with 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 increasing the rigidity of the vibration transmission plate 400, so that the curved extension portion 443 and the straight extension portion 433 are not easily damaged during the relative movement of the inner ring body 410 and the outer ring body 420.

[0065] In some embodiments, Figure 5 As shown, the connection between the first connecting rod 430 and the first inner ring edge 411 and the first outer ring edge 421 can present a smooth transition connection. The connection between the second connecting rod 440 and the first inner ring edge 411 and the first outer ring edge 421 also presents a smooth transition connection.

[0066] Specifically, the first connecting rod 430 is smoothly connected to the first inner ring edge 411 through the first inner connecting portion 431, and is smoothly connected to the first outer ring edge 421 through the first outer connecting portion 432. The second connecting rod 440 is smoothly connected to the first inner ring edge 411 through the second inner connecting portion 441, and is smoothly connected to the first outer ring edge 421 through the second outer connecting portion 442.

[0067] Such a configuration can improve the connection strength between the first connecting rod 430 and the inner ring body 410 and the outer ring body 420, and improve the connection strength between the second connecting rod 440 and the inner ring body 410 and the outer ring body 420, thereby improving the bending resistance of the first connecting rod 430 and the second connecting rod 440, so that the first connecting rod 430 and the second connecting rod 440 are not easily damaged due to bending during elastic deformation, thereby improving the life of the vibration transmission plate 400.

[0068] In some embodiments, the straight extension portion 433 and the first inner connection portion 431 and the first outer connection portion 432 are connected at a smooth transition, the first inner connection portion 431 and the first inner ring edge 411 are connected at a smooth transition, and the first outer connection portion 432 and the first outer ring edge 421 are connected at a smooth transition. The curved extension portion 443 and the second inner connection portion 441 and the second outer connection portion 442 are connected at a smooth transition, the second inner connection portion 441 and the first inner ring edge 411 are connected at a smooth transition, and the second outer connection portion 442 and the first outer ring edge 421 are connected at a smooth transition.

[0069] Such a configuration can improve the strength of the first connecting rod 430 and the second connecting rod 440, thereby improving the bending resistance of the first connecting rod 430 and the second connecting rod 440, so that the first connecting rod 430 and the second connecting rod 440 are not easily damaged due to bending when deformed, thereby improving the life of the vibration transmission plate 400.

[0070] In some embodiments, Figure 5 as well as Figure 6 As shown, the inner edge of the curved extension 443 may be arranged in an arc shape. The inner edge of the second inner connecting portion 441 may 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 connecting portion 441 refers to the edge of the second inner connecting portion 441 connecting the first inner ring edge 411 and the inner edge of the curved extension 443, and connecting the inner edge of the curved extension 443.

[0071] Since, when the second connecting rod 440 undergoes elastic deformation, its internal stress will be concentrated on the inner edges of the second inner connecting portion 441 and the curved extension portion 443, if the inner edges of the curved extension portion 443 and the inner edges of the second inner connecting portion 441 are set to other shapes, such as an angle type, then when the second connecting rod 440 undergoes elastic deformation, its stress will be concentrated at the angle, which may easily cause the vibration transmission plate 400 to tear from the angle.

[0072] Therefore, the inner edge of the curved extension portion 443 is set to be an arc shape, and the inner edge of the second inner connection portion 441 is set to be multiple arc shapes. This can reduce internal stress concentration when the curved extension portion 443 and the second inner connection portion 441 undergo elastic deformation, thereby improving the bending resistance of the curved extension portion 443 and the second inner connection portion 441, making it less likely to be damaged during elastic deformation, thereby improving the reliability and service life of the vibration transmission plate 400.

[0073] Of course, in other embodiments, the inner edge of the curved extension portion 443 and the inner edge of the second inner connection portion 441 may also be configured to be other shapes such as a wave shape, a broken line shape, etc., which are not specifically listed one by one in this embodiment.

[0074] Alternatively, if Figure 6 As shown, the first arc segment 4411 and the second arc segment 4412 can both be concave arcs. Wherein, setting the first arc segment 4411 and the second arc segment 4412 as concave arcs can make the inner edge of the second inner connecting portion 441 smoother, thereby achieving a natural transition connection between the curved extension portion 443 and the first inner ring edge 411, and enhancing the connection strength between the curved extension portion 443 and the inner ring body 410 through the second inner connecting portion 441.

[0075] Optionally, the ratio of the diameter of the first arc segment 4411 to the diameter of the inner edge of the curved extension portion 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 portion 443 may be between 0.11 and 0.14.

[0076] Specifically, if the ratio of the diameter of the first arc segment 4411 to the diameter of the inner edge of the curved extension portion 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 portion 443 is greater than 0.14, the diameters of the first arc segment 4411 and the second arc segment 4412 will be too large, thereby making the distance between the inner edge of the curved extension portion 443 and the first inner ring edge 411 wider, thereby increasing the tensile force that the curved extension portion 443 is subjected to when constraining the inner ring body 410, causing the curved extension portion 443 to be subjected to greater stress and 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 portion 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 portion 443 is less than 0.11, then when the curved extension portion 443 and the second inner connection portion 441 undergo elastic deformation, the stress will be excessively concentrated in the second inner connection portion 441, making it easy for the second inner connection portion 441 to break.

[0077] Therefore, the ratio of the diameter of the first arc segment 4411 to the diameter of the inner edge of the curved extension portion 443 is set 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 portion 443 is set between 0.11 and 0.14. This can effectively disperse the stress of the curved extension portion 443 and the second inner connecting portion 441 while improving the vibration sensitivity of the vibration transmission plate 400, reduce stress concentration, and thus improve the bending resistance of the curved extension portion 443 and the second inner connecting portion 441, making it less likely for them to break and be damaged during elastic deformation.

[0078] 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 0.0254, 0.0270 or 0.0285, etc. 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 0.1095, 0.1168 or 0.121, etc.

[0079] In some embodiments, Figure 6As shown, the outer edge of the second inner connecting portion 441 may be arranged opposite to the inner edge of the second inner connecting portion 441. The outer edge of the second inner connecting portion 441 may 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. 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 may 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 may 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.

[0080] Alternatively, if Figure 6 As shown, the third arc segment 4413 may be a concave arc, and the fourth arc segment 4414 may be a convex arc. The third arc segment 4413 is set as a concave arc, so that the third arc segment 4413 and the first inner ring edge 411 can be naturally transitioned and connected, and the fourth arc segment 4414 is set as a convex arc, so that the fourth arc segment 4414 can be naturally transitioned and connected to the third arc segment 4413 and the outer edge of the curved extension 443, thereby enhancing the connection strength between the curved extension 443 and the inner ring body 410 through the second inner connection portion 441.

[0081] Optionally, a ratio of a diameter of the third arc segment 4413 to a diameter of an inner edge of the curved extension portion 443 and a ratio of a diameter of the fourth arc segment 4414 to a diameter of an inner edge of the curved extension portion 443 are between 0.16 and 0.2.

[0082] 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 portion 443 is greater than 0.2, the distance between the curved extension portion 443 and the first inner ring edge 411 will also be wider, thereby increasing the tensile force that the curved extension portion 443 is subjected to when constraining the inner ring body 410, causing the curved extension portion 443 to be subjected to greater stress and 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 portion 443 is less than 0.16, the connection between the outer edge of the second inner connection portion 441 and the inner edge of the curved extension portion 443 will approach a right angle or an acute angle, and the connection between the outer edge of the second inner connection portion 441 and the first inner ring edge 411 will approach a right angle or an acute angle. Therefore, when the curved extension portion 443 and the second inner connection portion 441 undergo elastic deformation, the stress will be excessively concentrated in the second inner connection portion 441, making it easy for the second inner connection portion 441 to break. Therefore, by setting 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 to between 0.16 and 0.2, the stress between the curved extension portion 443 and the second inner connecting portion 441 can be dispersed, thereby improving the reliability of the vibration transmission plate 400.

[0083] For example, 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 can be set to values ​​such as 0.1732, 0.181 or 0.1957.

[0084] In some embodiments, the diameter of the fourth arc segment 4414 may be consistent with the diameter of the third arc segment 4413. Such a configuration makes the stress at the third arc segment 4413 and the fourth arc segment 4414 more uniform when the second inner connecting portion 441 undergoes elastic deformation, thereby increasing the connection strength between the curved extension portion 443 and the inner ring body 410 via the second inner connecting portion 441.

[0085] In some embodiments, the ratio of the straight-line distance from the connection point between the first arc segment 4411 and the first inner ring edge 411 to the connection point between 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.

[0086] The straight-line distance from the connection point between the first arc segment 4411 and the first inner ring edge 411 to the connection point between the third arc segment 4413 and the first inner ring edge 411 is the width of the connection between the second inner connecting portion 441 and the first inner ring edge 411. Specifically, the straight-line distance from the connection point between the first arc segment 4411 and the first inner ring edge 411 to the connection point between the third arc segment 4413 and the first inner ring edge 411 can be as follows: Figure 6 As shown in the middle length H1, the width of the curved extension 443 can be as Figure 6 The medium length h1 is shown.

[0087] The width of the connection between the second inner connection portion 441 and the first inner ring edge 411 is set to correspond to the width of the curved extension portion 443 , so that the connection strength between the second inner connection portion 441 and the first inner ring edge 411 can be stronger.

[0088] Specifically, if the ratio of the straight-line distance between the connection point between the first arc segment 4411 and the first inner ring edge 411 to the connection point between the third arc segment 4413 and the first inner ring edge 411 to the width of the curved extension 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 will be easily broken when elastic deformation occurs. If the ratio of the straight-line distance between the connection point between the first arc segment 4411 and the first inner ring edge 411 to the connection point between the third arc segment 4413 and the first inner ring edge 411 to the width of the curved extension 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 excessively restrict the movement of the inner ring body 410, thereby reducing the vibration sensitivity of the vibration transmission piece 400, thereby reducing the sensitivity of the transducer device 11, and affecting the bone conduction effect of the bone conduction earphone 1. Therefore, setting the ratio of the straight-line distance to the width of the curved extension portion 443 to between 2.65 and 3.25 can improve the sensitivity of the vibration transmission piece 400 while improving the ability of the vibration transmission piece 400 to resist bending and deformation, thereby improving the reliability of the vibration transmission piece 400.

[0089] For example, in some embodiments, the ratio of the straight-line distance from the connection point between the first arc segment 4411 and the first inner ring edge 411 to the connection point between the third arc segment 4413 and the first inner ring edge 411 to the width of the curved extension portion 443 may be 2.78, 2.95 or 3.187.

[0090] In some embodiments, the second inner connection portion 441 may be disposed adjacent to the first outer connection portion 432. Figure 6As shown, the outer edge of the first outer connecting 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 extension portion 433. The fifth arc segment 4321 and the sixth arc segment 4322 are connected at the short dashed line. The outer edge of the straight extension portion 433 refers to the side of the straight extension portion 433 facing the first outer ring edge 421, and the outer edge of the first outer connecting portion 432 refers to the edge of the first outer connecting portion 432 that connects the first outer ring edge 421 and the outer edge of the straight extension portion 433 and connects the outer edge of the straight extension portion 433.

[0091] Alternatively, if Figure 6 As shown, the fifth arc segment 4321 and the sixth arc segment 4322 may be concave arcs. The fifth arc segment 4321 and the sixth arc segment 4322 are set as concave arcs, so that the outer edge of the first outer connecting portion 432 is 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 connecting portion 431 and the outer ring body 420 through the first outer connecting portion 432.

[0092] 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.

[0093] Among them, the diameters of the fifth arc segment 4321 and the sixth arc segment 4322 are also set to be associated with the diameter of the curved extension portion 443, so that the outer edge of the first outer connecting portion 432 can correspond to the second inner connecting portion 441. When the first connecting rod 430 and the second connecting rod 440 are both subjected to force and elastically deformed, the stresses borne by the first connecting rod 430 and the second connecting rod 440 are equivalent, so that the stress can be evenly distributed, thereby providing reliability of the vibration transmission plate 400.

[0094] Specifically, if the ratio of the diameter of the fifth arc segment 4321 to the diameter of the outer edge of the curved extension portion 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 portion 443 is greater than 0.14, the diameters of the fifth arc segment 4321 and the sixth arc segment 4322 will be too large, so that the distance between the straight extension portion 433 and the first outer ring edge 421 is wider, which will increase the tensile force on the straight extension portion 433, causing the straight extension portion 433 to be subjected to greater stress and 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 portion 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 portion 443 is less than 0.11, it will cause the connection between the outer edge of the first outer connection portion 432 and the inner edge of the straight extension portion 433 to approach a right angle or an acute angle, and will also cause the connection between the outer edge of the first outer connection portion 432 and the first outer ring edge 421 to approach a right angle or an acute angle. Therefore, when the straight extension portion 433 and the first outer connection portion 432 undergo elastic deformation, the stress will be too concentrated on the first outer connection portion 432, making it easy for the first outer connection portion 432 to break, and will also increase the restraint force of the straight extension portion 433 on the inner ring body 410, thereby affecting the vibration sensitivity of the vibration transmission plate 400.

[0095] Therefore, the ratio of the diameter of the fifth arc segment 4321 to the diameter of the outer edge of the curved extension portion 443 is set between 0.02 and 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 portion 443 is set between 0.11 and 0.14. This can effectively disperse the stress at the first external connection portion 432 and reduce stress concentration, thereby improving the bending resistance of the straight extension portion 433 and the first external connection portion 432, making it less likely to break and damage during elastic deformation.

[0096] 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 may be 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 may be 0.1095, 0.1168, or 0.121, etc.

[0097] In some embodiments, the diameter of the fifth arc segment 4321 may be consistent with the diameter of the first arc segment 4411, and the diameter of the sixth arc segment 4322 may be consistent with the diameter of the second arc segment 4412. In this way, the inner edge of the second inner connecting portion 441 and the outer edge of the first outer connecting portion 432 may be arranged in a consistent manner, so that the connection between the first connecting rod 430 and the inner ring body 410 and the connection between the second connecting rod 440 and the outer ring body 420 can not only share the same stress, but also reduce the problem of stress concentration between the first connecting rod 430 and the second connecting rod 440. Moreover, the connection between the first connecting rod 430 and the inner ring body 410 and the connection between the second connecting rod 440 and the outer ring body 420 are adjacent to each other, which can also reduce the problem of excessive stress concentration between the inner ring body 410 and the outer ring body 420 when they are constrained by the first connecting rod 430 and the second connecting rod 440.

[0098] In some embodiments, Figure 6 As shown, the inner edge of the first outer connecting 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 seventh arc segment 4323 and the inner edge of the straight extension portion 433. Figure 6 The inner edge of the straight extension portion 433 refers to the side of the straight 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 extension portion 433 and the first outer ring edge 421 .

[0099] The seventh arc segment 4323 may be a concave arc, and the eighth arc segment 4324 may be a convex arc. In this way, the inner edge of the first outer connecting portion 432 can be naturally connected and transitioned with the first outer ring edge 421 and the inner edge of the straight extension portion 433, thereby enhancing the connection strength of the second inner connecting portion 441.

[0100] Alternatively, if Figure 7 As shown, the line connecting the center of the fourth arc segment 4414 and the center of 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 443 and the spacing direction of the two first straight line segments 4111 is between 8° and 18°. Figure 7 The center point D in the middle of the curved extension 443 can be seen from Figure 7 The angle formed by the line connecting the center E of the circle, the midpoint D and the center E of the inner edge of the curved extension 443 and the spacing direction of the two first straight line segments 4111 can be seen in FIG. Figure 7 The angle α is shown in the figure.

[0101] Specifically, according to the above-mentioned angle α, the positions of the fourth arc segment 4414 and the eighth arc segment 4324 can be determined corresponding to the outer edge of the inner ring body 410, and then the positions of the first inner connecting part 431 and the second outer connecting part 442 can be determined. Therefore, the setting of the angle α can correspond to the adjustment of the setting of the first inner connecting part 431 and the second outer connecting part 442, and then the position, length and force state of the first connecting rod 430 and the second connecting rod 440 can be adjusted, so as to adjust the radial force state of the vibration transmission plate 400, especially the force state in the spacing direction of the two first straight line segments 4111 and the spacing direction of the two first curved segments 4112.

[0102] The angle α formed by the line connecting the center of the fourth arc segment 4414 and the center of the eighth arc segment 4324 and the spacing direction of the two first straight line segments 4111 is set between 8° and 18°, which can ensure that the forces on the first connecting rod 430 and the second connecting rod 440 are more balanced, thereby reducing the phenomenon of stress concentration, and can also ensure the stiffness of the vibration transmission plate 400 in the spacing direction of the two first straight line segments 4111 and the spacing direction of the two first curved segments 4112. If the angle α is less than 8° or greater than 18°, the stress will be too concentrated in the spacing direction of the two first straight line segments 4111 or the spacing direction of the two first curved segments 4112, and the stiffness in the other direction will also be reduced. Therefore, when the energy conversion device 11 vibrates, the vibration transmission plate 400 is easy to break.

[0103] In some embodiments, the angle α may be between 11° and 15°. This arrangement can further ensure the rigidity of the vibration transmission plate 400 in all directions while making the forces on the first connecting rod 430 and the second connecting rod 440 more balanced. For example, the angle α may be 12°, 13°, or 14°.

[0104] In some embodiments, 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 portion 443 or the straight extension portion 433 is between 3.71 and 4.54. Figure 7 As shown in the middle length F, the width of the straight extension portion 433 can be as Figure 6 As shown in the middle length h2.

[0105] like Figure 7It can be known that the distance between the center of the fourth arc segment 4414 and the center of the eighth arc segment 4324 involves the arc curvature radius of the fourth arc segment 4414 and the eighth arc segment 4324 and the distance between the two arcs, and the size of the arc curvature radius of the fourth arc segment 4414 and the eighth arc segment 4324 also involves the degree of change and transition between the first outer connecting portion 432 and the second inner connecting portion 441 connecting the inner ring body 410 and the outer ring body 420. Therefore, the connection length between the center of the fourth arc segment 4414 and the center of the eighth arc segment 4324 is associated with the width of the curved extension portion 443 or the straight extension portion 433, so that the degree of connection between the first outer connecting portion 432 and the inner ring body 410 and the outer ring body 420 can be adjusted, the degree of connection between the second inner connecting portion 441 and the inner ring body 410 and the outer ring body 420 can be adjusted, and the distance between the first outer connecting portion 432 and the second inner connecting portion 441 can be adjusted.

[0106] 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 is usually concentrated on the second outer connecting portion 442 and the second inner connecting portion 441. Therefore, the arc curvature radius of the fourth arc segment 4414 and the eighth arc segment 4324 is associated with the width of the curved extension portion 443 or the straight extension portion 433. Therefore, the stability of the first outer connecting portion 432 and the second inner connecting portion 441 can be adjusted accordingly to further control and reinforce the position of stress concentration, so that the first outer connecting portion 432 and the second inner connecting portion 441 are not easily broken due to stress concentration, thereby improving the stability of the vibration transmission plate 400.

[0107] 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 portion 443 is less than 3.71, or the ratio of the connection length to the width of the straight extension portion 433 is less than 3.71, the radius of curvature of the arcs of the fourth arc segment 4414 and the eighth arc segment 4324 will be too small, or the distance between the fourth arc segment 4414 and the eighth arc segment 4324 will be too small. In addition, when the first connecting rod 430 and the second connecting rod 440 are elastically deformed, the internal stress may be concentrated at the second outer connecting portion 442 and the second inner connecting portion 441, thereby causing the connection between the first connecting rod 430 and the inner ring body 410 and the outer ring body 420 to be easily broken, and the connection between the second connecting rod 440 and the inner ring body 410 and the outer ring body 420 to be easily broken.

[0108] 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 portion 443 is greater than 4.54, or the ratio of the connection length to the width of the straight extension portion 433 is greater than 4.54, the radius of curvature of the arcs of the fourth arc segment 4414 and the eighth arc segment 4324 will be too large, the width of the second outer connecting portion 442 and the second inner connecting portion 441 will be larger, or the distance between the fourth arc segment 4414 and the eighth arc segment 4324 will be too large, which is not conducive to the mutual movement of the inner ring body 410 and the outer ring body 420, and further affects the vibration sensitivity of the vibration transmission plate 400.

[0109] Therefore, by 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 portion 443 or the straight extension portion 433 to be between 3.71 and 4.54, the connection strength between the second outer connection portion 442 and the second inner connection portion 441 can be strengthened while maintaining the vibration sensitivity of the vibration transmission piece 400, so that the second outer connection portion 442 and the second inner connection portion 441 are not easily broken due to stress concentration, thereby improving the radial stiffness of the vibration transmission piece 400, thereby improving 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 portion 443 or the straight extension portion 433 can be 3.862, 4.12 or 4.374.

[0110] In some embodiments, the width of the curved extension portion 443 may be between the width of the straight extension portion 433 and the width of the inner ring body 410. This arrangement can prevent the curved extension portion 443 from affecting the vibration sensitivity of the vibration transmission piece 400.

[0111] Optionally, in some embodiments, the width of the curved extension portion 443 may be consistent with the width of the straight extension portion 433, and the width of the curved extension portion 443 and the width of the straight extension portion 433 may both be smaller than the width of the inner ring body 410, thereby further ensuring the vibration sensitivity of the vibration transmission piece 400. For example, the width of the curved extension portion 443 and the width of the straight extension portion 433 may both be 0.3 mm, 0.34 mm, 0.4 mm, or 0.45 mm.

[0112] 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 portion 443 and the ratio of the diameter of the eighth arc segment 4324 to the diameter of the inner edge of the curved extension portion 443 are between 0.16 and 0.2.

[0113] By such arrangement, the shapes of the seventh arc segment 4323 and the eighth arc segment 4324 can be similar to the shapes 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 external connection portion 432, thereby improving the reliability of the vibration transmission piece 400.

[0114] For example, the ratio of the diameter of the seventh arc segment 4323 to the diameter of the inner edge of the curved extension portion 443 and the ratio of the diameter of the eighth arc segment 4324 to the diameter of the inner edge of the curved extension portion 443 can be set to values ​​such as 0.1732, 0.181 or 0.1957.

[0115] 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 consistent. In this way, the first outer connecting portion 432 and the second inner connecting portion 441 can present similar shapes, so that when the first outer connecting portion 432 and the second inner connecting portion 441 are elastically deformed, the internal stress of the two is more balanced, which can reduce the difference in stress between the two, thereby improving the reliability and service life of the vibration transmission piece 400.

[0116] 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 inconsistent, or the third arc segment 4413 and the fourth arc segment 4414 can be set to be consistent, and the diameters of the seventh arc segment 4323 and the eighth arc segment 4324 can be set to be consistent. This embodiment does not make any specific limitations here.

[0117] In some embodiments, Figure 6 As shown, the straight-line distance from the connection point between the fifth arc segment 4321 and the first outer ring edge 421 to the connection point between the seventh arc segment 4323 and the first outer ring edge 421 is greater than the straight-line distance from the connection point between the first arc segment 4411 and the first inner ring edge 411 to the connection point between the third arc segment 4413 and the first inner ring edge 411.

[0118] Specifically, the straight-line distance from the connection point between the fifth arc segment 4321 and the first outer ring edge 421 to the connection point between the seventh arc segment 4323 and the first outer ring edge 421 is as follows: Figure 6 Medium length H2.

[0119] The straight-line distance between the connection point between the fifth arc segment 4321 and the first outer ring edge 421 and the connection point between the seventh arc segment 4323 and the first outer ring edge 421 is the width of the connection between the first connecting rod 430 and the first outer ring edge 421. The straight-line distance between the connection point between the first arc segment 4411 and the first inner ring edge 411 and the connection point between the third arc segment 4413 and the first inner ring edge 411 is the width of the connection between the second connecting rod 440 and the first inner ring edge 411.

[0120] Since the first outer ring edge 421 is located outside the first inner ring edge 411, the movement amplitude of the first outer ring edge 421 will be larger when the inner ring body 410 and the outer ring body 420 move relative to each other, so a larger restraining force is required to constrain the outer ring body 420. Therefore, the straight-line distance from the connection point between the fifth arc segment 4321 and the first outer ring edge 421 to the connection point between the seventh arc segment 4323 and the first outer ring edge 421 is set to be greater than the straight-line distance from the connection point between the first arc segment 4411 and the first inner ring edge 411 to the connection point between the third arc segment 4413 and the first inner ring edge 411, which can strengthen the constraint on the outer ring body 420 and the connection strength, thereby improving the reliability of the vibration transmission plate 400.

[0121] In some embodiments, the ratio of the straight line distance from the connection point between the fifth arc segment 4321 and the first outer ring edge 421 to the connection point between the seventh arc segment 4323 and the first outer ring edge 421 to the width of the straight extension portion 433 is between 3.17 and 3.88.

[0122] By setting the width of the connection between the first outer connection portion 432 and the first outer ring edge 421 to correspond to the width of the straight extension portion 433 , the connection strength of the connection between the first outer connection portion 432 and the first outer ring edge 421 can be adjusted more accurately.

[0123] 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 extension 433 is set to be less than 3.17, the connection between the first outer connection part 432 and the first outer ring edge 421 will be relatively weak, and the first outer connection part 432 will be easily broken when elastic deformation occurs. If the ratio of the above-mentioned straight-line distance to the width of the straight extension 433 is set to be greater than 3.88, the connection between the first outer connection part 432 and the first outer ring edge 421 will be too wide, and the first outer connection part 432 will excessively restrict the movement of the inner ring body 410, thereby reducing the vibration sensitivity of the vibration transmission piece 400, thereby reducing the sensitivity of the transducer device 11, and affecting the bone conduction effect of the bone conduction earphone 1. Therefore, by setting the ratio of the straight distance H2 to the width of the straight extension portion 433 to be between 3.17 and 3.88, the sensitivity of the vibration transmission piece 400 can be ensured while improving the stiffness of the vibration transmission piece 400 in the radial direction.

[0124] For example, the ratio of the straight-line distance from the connection point between the fifth arc segment 4321 and the first outer ring edge 421 to the connection point between the seventh arc segment 4323 and the first outer ring edge 421 to the width of the straight extension portion 433 may be 3.246, 3.52 or 3.751.

[0125] 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 the two ends of the first connecting rod 430 and the second connecting rod 440 each present a similar setting, thereby being able to reduce the stress difference when the first connecting rod 430 and the second connecting rod 440 are elastically deformed to disperse the stress, thereby reducing the probability of the vibration transmission plate 400 breaking and improving the reliability and service life of the vibration transmission plate 400.

[0126] Based on the structural setting of the vibration transmission piece 400 described above, a single-direction load fatigue simulation can be performed on the vibration transmission piece 400, and the distribution of stress and fatigue failure cycle number of the vibration transmission piece 400 under loads in the above-mentioned directions can be studied.

[0127] In some embodiments, the spacing direction of the two first straight line segments 4111 can be defined as the width direction of the vibration transmission sheet 400 (ie Figure 6 The direction indicated by the X arrow in the figure), the spacing direction of the two first curved segments 4112 can be defined as the length direction of the vibration transmission piece 400 (ie Figure 6The 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 divided into loads along the width direction, loads along the length direction, axial loads (i.e., loads in the thickness direction of the vibration transmission piece 400), and overturning loads (loads that cause the vibration transmission piece 400 to overturn around the width direction).

[0128] Figure 8 is a schematic diagram of stress distribution of the vibration transmission piece 400 under load along the length direction, as shown in Figure 8 As shown, when the vibration transmission plate 400 is subjected to a unidirectional load along the length direction, the elastic deformation degree of the second connecting rod 440 is relatively large, the stress is concentrated on the two second connecting rods 440, and the stress is dispersed on the second inner connecting portion 441, the second outer connecting portion 442 and the curved extension portion 443 of the second connecting rod 440, rather than being concentrated on only one point.

[0129] Furthermore, in a fatigue simulation test, when the vibration transmission plate 400 is subjected to alternating stress along the length direction, the fatigue failure cycle number of the vibration transmission plate 400 is 1.28E8. Therefore, the structural arrangement of the two second connecting rods 440 can reduce stress concentration when the vibration transmission plate 400 is subjected to load along the length direction, so as to improve the stiffness of the vibration transmission plate 400 in the length direction and improve the service life of the vibration transmission plate 400.

[0130] Fig. 9 is a schematic diagram of stress distribution of the vibration transmission plate 400 under load along the width direction, as shown in Fig. 9 As shown, when the vibration transmission piece 400 is subjected to a unidirectional load in the width direction, the two first connecting rods 430 and the two second connecting rods 440 both undergo large elastic deformation, and the stress is concentrated on the two first connecting rods 430 and the two second connecting rods 440, rather than being concentrated on only one point. Furthermore, in a fatigue simulation test, when the vibration transmission piece 400 is subjected to alternating stress in the width direction, the fatigue failure cycle number of the vibration transmission piece 400 is 9.49E11.

[0131] Therefore, when the vibration transmission plate 400 is subjected to 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 and reduce stress concentration, thereby increasing the stiffness of the vibration transmission plate 400 in the width direction and increasing the service life of the vibration transmission plate 400.

[0132] Fig.10 as well as Fig.11 Schematic diagram of stress distribution of the vibration transmission piece 400 under axial load in the axial direction. Fig.10as well as Fig.11 As shown, when the vibration transmission piece 400 is subjected to an axial load (i.e., a load in a direction perpendicular to the plane where the vibration transmission piece 400 is located), the two first connecting rods 430 and the two second connecting rods 440 undergo elastic deformation, and the stress is distributed in various parts of the two first connecting rods 430 and the two second connecting rods 440, rather than being concentrated in a certain place. Furthermore, in a fatigue simulation test, when the vibration transmission piece 400 is subjected to alternating stress in the axial direction, the fatigue failure cycle number of the vibration transmission piece 400 is 4.04E4.

[0133] When the bone conduction earphone 1 works normally, when the bracket 200 with the voice coil 100 and the magnetic circuit system 300 move relative to each other, the bracket 200 with the voice coil 100 will drive the inner ring 410 to move, and the magnetic circuit system 300 will drive the outer ring 420 to move. At this time, the load on the vibration transmission plate 400 is the axial load. Fig.10 as well as Fig.11 It can be seen that when the bone conduction earphone 1 works normally, the stress of the vibration transmission plate 400 can be distributed in various parts of the two first connecting rods 430 and the two second connecting rods 440, thereby improving the radial stiffness of the vibration transmission plate 400 and improving the reliability and service life of the vibration transmission plate 400.

[0134] 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 larger than that in the width direction, the vibration transmission piece 400 is easily subjected to a flip load around the width direction during collision or transportation of the bone conduction earphone 1. Fig.12 As shown, Fig.12 It is a schematic diagram of stress distribution of the vibration transmission plate 400 under a flipping load in the width direction. When the vibration transmission plate 400 is subjected to a flipping load in the width direction, the two first connecting rods 430 and the two second connecting rods 440 will undergo elastic deformation, and the stress of the two first connecting rods 430 and the two second connecting rods 440 are more evenly distributed in various parts.

[0135] Furthermore, in a fatigue simulation test in which the vibration transmission piece 400 is subjected to a rollover load in the width direction, the fatigue failure cycle number of the vibration transmission piece 400 is 5.99E11. Therefore, when the vibration transmission piece 400 is subjected to a rollover load, the two first connecting rods 430 and the two second connecting rods 440 of the vibration transmission piece 400 can also bear stress more evenly, thereby achieving the effect of increasing the service life of the vibration transmission piece 400.

[0136] From the above description, it can be seen that the structural setting of the vibration transmission plate 400 can effectively disperse stress, reduce stress concentration and prone to fracture, and can increase the stiffness of the vibration transmission plate 400 in the radial and axial directions of the vibration transmission plate 400, thereby improving the reliability and service life of the vibration transmission plate 400.

[0137] In some embodiments, Figure 7 As shown, the outer ring body 420 has a first outer ring edge 421 disposed adjacent to the inner ring body 410 and a second outer ring edge 422 disposed away from the inner ring body 410. A positioning protrusion 4221 may be disposed on the second outer ring edge 422, and the positioning protrusion 4221 protrudes toward the outside of the vibration transmission plate 400. In other words, the positioning protrusion 4221 is disposed on the side of the second outer ring edge 422 that is away from the inner ring body 410.

[0138] Specifically, a positioning protrusion 4221 is provided on the second outer ring edge 422, and the positioning protrusion 4221 can protrude to the outside of the vibration transmission plate 400, so that the vibration transmission plate 400 can be positioned in the jig for assembling the transducer device 11 through the positioning protrusion 4221 when the transducer device 11 is installed, so as to facilitate the installation of other components such as the bracket 200 and the magnetic circuit system 300 on the vibration transmission plate 400. During the installation process, the vibration transmission plate 400 needs to be further connected with other components of the speaker assembly 10 after being positioned on the jig. The positioning protrusion 4221 can improve the positioning accuracy, so that the vibration transmission plate 400 can be more accurately positioned with the jig, and the shaking of the vibration transmission plate 400 in the jig can also be reduced, so as to improve the assembly efficiency and assembly effect of the transducer device 11.

[0139] In some embodiments, Figure 7 As shown, the second outer ring edge 422 may include two first sub-straight segments 4222 arranged side by side and opposite to each other, and two first sub-curved segments 4223 respectively connecting adjacent ends of the two first sub-straight segments 4222 and protruding toward the outside of the vibration transmission piece 400. Optionally, the two first sub-straight segments 4222 may correspond to the two second straight segments 4211 of the first outer ring edge 421, and the two first sub-curved segments 4223 may correspond to the two first curved segments 4112 of the first outer ring edge 421.

[0140] The positioning protrusion 4221 can be arranged on the first sub-straight segment 4222. The positioning protrusion 4221 can be arranged on the first sub-straight segment 4222 instead of the first sub-curved segment 4223, which can facilitate the formation of the positioning protrusion 4221. The difficulty of arranging the positioning protrusion 4221 on the first sub-curved segment 4223 is greater than the difficulty of arranging the positioning protrusion 4221 on the first sub-straight segment 4222, and the positioning protrusion 4221 arranged on the first sub-curved segment 4223 also needs to be chamfered, so that the positioning protrusion 4221 arranged on the first sub-curved segment 4223 can minimize the influence on the shape of the first sub-curved segment 4223.

[0141] Of course, in other embodiments, the positioning protrusion 4221 may also be disposed on the first sub-curve segment 4223, which is not specifically limited in this embodiment.

[0142] In some embodiments, Figure 7 As shown, the first sub-straight line segment 4222 may also be provided with a positioning groove 4224 recessed toward the inner ring body 410. The positioning groove 4224 and the positioning protrusion 4221 are staggered from each other along the circumference of the second outer ring edge 422. When the transducer 11 is observed along the axis of the transducer 11, the positioning groove 4224 can expose part of the magnetic circuit system 300, so that part of the magnetic circuit system 300 is not covered by the vibration transmission sheet 400. The axis of the transducer 11 may be perpendicular to the radial direction of the bracket 200, or may be parallel to the vibration direction of the bracket 200.

[0143] Alternatively, if Figure 4 As shown, the transducer device 11 may further include a clamp 500, which may clamp the exposed portion of the magnetic circuit system 300 so that the magnetic circuit system 300 is not easily dispersed during vibration, and the exposed portion of the magnetic circuit system 300 corresponds to the position of the positioning slot 4224. When the transducer device 11 is observed along the axis of the transducer device 11, the clamp 500 is offset from the vibration transmission sheet 400 through the positioning slot 4224, and thus the clamp 500 is also offset from the positioning protrusion 4221.

[0144] In some embodiments, Figure 7 As shown, the positioning protrusion 4221 can be located at the edge of the positioning slot 4224. When observed along the thickness direction of the vibration transmission sheet 400, the edge of one side of the positioning protrusion 4221 close to the positioning slot 4224 is located on a straight line with the slot wall of the positioning slot 4224 and forms a first straight line 4225. In this way, the positioning protrusion 4221 is arranged on a side wall of the positioning slot 4224, which can facilitate the formation of the positioning protrusion 4221. The positioning slot 4224 can be used to locate and add the positioning protrusion 4221, so as to reduce the processing difficulty of the vibration transmission sheet 400.

[0145] Of course, in other embodiments, the positioning protrusion 4221 can be located at other positions of the first sub-straight segment 4222, for example, it can be located at 1 cm or 0.5 cm away from the positioning groove 4224, etc. This embodiment will not be listed in detail one by one.

[0146] In some embodiments, Figure 7 As shown, the first straight line 4225 can be arranged perpendicular to the first sub-straight line segment 4222. Such an arrangement not only facilitates the formation of the positioning slot 4224 and the positioning protrusion 4221, but also enables the positioning slot 4224 to further limit the movement of the magnetic circuit system 300 by limiting the clamp 500, so that the magnetic circuit system 300 is not easily misaligned.

[0147] In some embodiments, Figure 7 As shown, the positioning protrusion 4221 can be set in a rectangular shape. Optionally, one side of the rectangular positioning protrusion 4221 is connected and fixed to the first outer ring edge 421, and the other three edges exceed the first outer ring edge 421, so as to be used for positioning with the jig for assembling the energy conversion device 11. The rectangular positioning protrusion 4221 is easy to shape and can also facilitate improving the positioning accuracy.

[0148] Of course, in other embodiments, the positioning protrusion 4221 may also be circular, conical, or other shapes, which are not specifically listed here in this embodiment.

[0149] In some embodiments, Figure 7 As shown, positioning protrusions 4221 may be respectively provided on both sides of the positioning slot 4224. The provision of multiple positioning protrusions 4221 may further improve the positioning accuracy, and may also prevent the positioning protrusions 4221 themselves from being broken off and damaged during the process of cooperating with the fixture for positioning.

[0150] In some embodiments, Figure 7 As shown, there are two groups of positioning slots 4224 and positioning protrusions 4221 , which are respectively arranged on two first sub-straight line segments 4222 .

[0151] Optionally, the two groups of positioning grooves 4224 and the two groups of positioning protrusions 4221 may be arranged in an axisymmetric manner to achieve positioning in coordination with a fixture on both sides of the spacing direction of the two first sub-straight line segments 4222, thereby further improving the positioning accuracy.

[0152] For example, Figure 7As shown, a group of positioning grooves 4224 can have one positioning groove 4224, and a group of positioning protrusions 4221 can have two positioning protrusions 4221, the two positioning protrusions 4221 are respectively located on both sides of the positioning groove 4224, and the side edges of the two positioning protrusions 4221 close to the positioning groove 4224 naturally transition with the two groove walls of the positioning groove 4224, and are located on the same straight line.

[0153] Optionally, each group of positioning grooves 4224 and positioning protrusions 4221 is centrally arranged relative to the first sub-straight segment 4222 along the extension direction of the first sub-straight segment 4222. In this way, the positioning grooves 4224 and the positioning protrusions 4221 are centrally arranged on the first sub-straight segment 4222, which not only facilitates the positioning of the positioning grooves 4224 and the positioning protrusions 4221, but also enables the vibration transmission plate 400 to be subjected to balanced force when the transducer device 11 is assembled, so that the length of the first sub-straight segment 4222 can be reduced, thereby reducing the size of the vibration transmission plate 400.

[0154] In some embodiments, the protruding length of the positioning protrusion 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. Figure 7 As shown in the middle length K1, the width of the positioning protrusion 4221 relative to the second outer ring edge 422 can be as follows Figure 7 The middle length K2 is shown.

[0155] Specifically, if the protruding length of the positioning protrusion 4221 relative to the second outer ring edge 422 is less than 0.315 mm, the positioning protrusion 4221 is not easy to cooperate with the jig for positioning, and its positioning accuracy is too low. If the protruding length of the positioning protrusion 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 protrusion 4221, which will affect the size of the earphone. Therefore, setting the protruding length of the positioning protrusion 4221 relative to the second outer ring edge 422 to between 0.315 mm and 0.385 mm can improve the positioning accuracy while allowing the vibration transmission plate 400 to retain a narrower size in the spacing direction of the two first sub-straight line segments 4222.

[0156] Similarly, if the width of the positioning protrusion 4221 relative to the second outer ring edge 422 is less than 0.378 mm, the positioning protrusion 4221 is not easy to cooperate with the fixture for positioning, and its positioning accuracy is too low. If the width of the positioning protrusion 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 line segment 4222. Therefore, setting the width of the positioning protrusion 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 vibration transmission plate 400 narrow in the extension direction of the first sub-straight line segment 4222.

[0157] For example, the protruding length of the positioning protrusion 4221 relative to the second outer ring edge 422 can be set to a value such as 0.325mm, 0.35mm or 0.375mm, and the width relative to the second outer ring edge 422 can be set to a value such as 0.395mm, 0.42mm or 0.457mm.

[0158] In summary, the present application sets a first connecting rod 430 and a second connecting rod 440 to connect the inner ring body 410 and the outer ring body 420. The first connecting rod 430 and the second connecting rod 440 are both set to connect the inner ring body 410 at one end and the outer ring body 420 at the other end. The first connecting rod 430 is set in the straight gap 401 between the inner ring body 410 and the outer ring body 420, and the first connecting rod 430 is provided with a straight extension portion 433 corresponding to the straight gap 401 and the straight shape of the inner ring body 410 and the outer ring body 420, and the second connecting rod 440 is set in the curved gap between the inner ring body 410 and the outer ring body 420. In the curved gap 402, the second connecting rod 440 is provided with a curved extension portion 443 corresponding to the curved gap 402 and the curved shape of the inner ring body 410 and the outer ring body 420. Therefore, the matching design of the first connecting rod 430 and the second connecting rod 440 corresponding to the shape of the inner ring body 410 and the outer ring body 420 can increase the lateral stiffness while maintaining the sensitivity of the relative movement of the inner ring body 410 and the outer ring body 420 when the inner ring body 410 moves relative to the outer ring body 420, so that the first connecting rod 430 and the second connecting rod 440 are not easy to break, thereby improving the reliability of the vibration transmission plate 400 and increasing the life of the vibration transmission plate 400.

[0159] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also 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 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 inner ring body has a first inner ring edge arranged adjacent to the outer ring body, the first inner ring edge includes two first straight line segments arranged side by side and opposite to each other and two first curved line segments respectively connecting adjacent ends of the two first straight line segments and protruding toward the outside of the vibration transmission plate, the outer ring body has a first outer ring edge arranged adjacent to the inner ring body, the first outer ring edge includes two second straight line segments respectively located outside the two first straight line segments and two second curved line segments respectively located outside the two first curved line segments, so as to form a straight gap between adjacent first straight line segments and second straight line segments, and form a curved gap between adjacent first curved line segments and second curved line segments; The first connecting rod comprises a first inner connecting portion connected to the first inner ring edge, a first outer connecting portion connected to the first outer ring edge, and a straight bar extending portion connected between the first inner connecting portion and the first outer connecting portion and located in the straight bar gap; The second connecting rod includes a second inner connecting portion connected to the first inner ring edge, a second outer connecting portion connected to the first outer ring edge, and a curved extending portion connected between the second inner connecting portion and the second outer connecting portion and located in the curved gap.

2. The vibration transmission sheet according to claim 1, characterized in that: The number of the first connecting rods and the number of the second connecting rods are two respectively, and the two first connecting rods and the two second connecting rods are rotationally symmetric by 180 degrees with respect to the centroid or the center of mass of the inner ring body.

3. The vibration transmission sheet according to claim 1, characterized in that: The first inner connection portion is disposed adjacent to the second outer connection portion, and the first outer connection portion is disposed adjacent to the second inner connection portion.

4. The vibration transmission sheet according to claim 1, characterized in that: The first curved segment, the second curved segment and the inner and outer edges of the curved extension are respectively arranged in arc shapes with the same center, and the first straight segment, the second straight segment and the inner and outer edges of the straight extension are arranged parallel to each other.

5. The vibration transmission sheet according to claim 1, characterized in that: The inner edge of the curved extension portion is arranged in an arc shape, and the inner edge of the second inner connecting portion includes a first arc segment connected to the first inner ring edge and a second arc segment connecting the first arc segment and the inner edge of the curved extension portion, the ratio of the diameter of the first arc segment to the diameter of the inner edge of the curved extension portion is between 0.02 and 0.03, the ratio of the diameter of the second arc segment to the diameter of the inner edge of the curved extension portion is between 0.11 and 0.14, and the first arc segment and the second arc segment are concave arcs.

6. The vibration transmission sheet according to claim 5, characterized in that: The outer edge of the second inner connecting portion includes a third arc segment connected to the first inner ring edge and a fourth arc segment connecting the third arc segment and the outer edge of the curved extension portion, the ratio of the diameter of the third arc segment to the diameter of the inner edge of the curved extension portion and the ratio of the diameter of the fourth arc segment to the diameter of the inner edge of the curved extension portion are between 0.16 and 0.2, the third arc segment is a concave arc, and the fourth arc segment is a convex arc.

7. The vibration transmission sheet according to claim 6, characterized in that: The diameter of the fourth arc segment is consistent with the diameter of the third arc segment.

8. The vibration transmission sheet according to claim 6, characterized in that: A ratio of a straight-line distance from a connection point between the first arc segment and the first inner ring edge to a connection point between the third arc segment and the first inner ring edge to a width of the curved extension portion is between 2.65 and 3.

25.

9. The vibration transmission sheet according to claim 6, characterized in that: The second inner connecting portion is arranged adjacent to the first outer connecting portion, and the outer edge of the first outer connecting portion includes a fifth arc segment connected to the first outer ring edge and a sixth arc segment connecting the fifth arc segment and the outer edge of the straight extension portion, the ratio of the diameter of the fifth arc segment to the diameter of the inner edge of the curved extension portion is between 0.02 and 0.03, the ratio of the diameter of the sixth arc segment to the diameter of the inner edge of the curved extension portion is between 0.11 and 0.14, and the fifth arc segment and the sixth arc segment are concave arcs.

10. The vibration transmission sheet according to claim 9, characterized in that: The diameter of the fifth circular arc segment is consistent with the diameter of the first circular arc, and the diameter of the sixth circular arc segment is consistent with the diameter of the second circular arc.

11. The vibration transmission sheet according to claim 9, characterized in that: The inner edge of the first outer connecting portion includes a seventh arc segment connected to the first outer ring edge and an eighth arc segment connecting the seventh arc segment and the inner edge of the straight extension portion. The line connecting the center of the fourth arc segment and the center of the eighth arc segment has a midpoint. The angle formed by the line connecting the midpoint and the center of the inner edge of the curved extension portion and the spacing direction of the two first straight line segments is between 8° and 18°. The seventh arc segment is a concave arc, and the eighth arc segment is a convex arc.

12. The vibration transmission sheet according to claim 11, characterized in that: The angle is between 11° and 15°.

13. The vibration transmitting piece according to claim 11, characterized in that: The ratio of the connection length between the center of the fourth arc segment and the center of the eighth arc segment to the width of the curved extension portion or the straight extension portion is between 3.71 and 4.

54.

14. The vibration transmission sheet according to claim 13, characterized in that: The width range of the curved extension portion is between the width value of the straight extension portion and the width value of the inner ring body.

15. The vibration transmission sheet according to claim 11, characterized in that: A ratio of the diameter of the seventh arc segment to the diameter of the inner edge of the curved extension portion and a ratio of the diameter of the eighth arc segment to the diameter of the inner edge of the curved extension portion are between 0.16 and 0.

2.

16. The vibration transmission sheet according to claim 15, characterized in that: The diameters of the third arc segment, the fourth arc segment, the seventh arc segment and the eighth arc segment are consistent.

17. The vibration transmitting piece according to claim 11, characterized in that: The straight-line distance from the connection point of the fifth arc segment and the first outer ring edge to the connection point of the seventh arc segment and the first outer ring edge is greater than the straight-line distance from the connection point of the first arc segment and the first inner ring edge to the connection point of the third arc segment and the first inner ring edge.

18. The vibration transmission sheet according to claim 17, characterized in that: The ratio of the straight-line distance from the connection point of the fifth arc segment and the first outer ring edge to the connection point of the seventh arc segment and the first outer ring edge to the width of the straight extension portion is between 3.17 and 3.

88.

19. The vibration transmission sheet according to claim 1, characterized in that: The connection between the first connecting rod and the first inner ring edge and the first outer ring edge is a smooth transition connection; the connection between the second connecting rod and the first inner ring edge and the first outer ring edge is also a smooth transition connection.

20. 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 19, 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.

21. A bone conduction headset, characterized in that: The bone conduction earphone comprises the vibration transmission piece as described in any one of claims 1-19.

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