Vibration transmission plate, loudspeaker assembly and bone conduction headset

Abstract

The present application relates to a vibration transmission plate, a loudspeaker assembly and a bone conduction headset. The loudspeaker assembly comprises an inner ring body, an outer ring body, and first connecting rods and second connecting rods, wherein the inner ring body has a first inner ring edge, which comprises two first straight segments and two first curved segments, and the outer ring body has a first outer ring edge, which comprises two second straight segments and two second curved segments, thus forming straight gaps between the first straight segments and the second straight segments, and forming curved gaps between the first curved segments and the second curved segments; each first connecting rod comprises a first inner connecting part, a first outer connecting part connected to the first outer ring edge, and a straight extension part located in a straight gap; and each second connecting rod comprises a second inner connecting part, a second outer connecting part, and a curved extension part located in a curved gap. The present application can increase the rigidity of the vibration transmission plate, improve the reliability of the vibration transmission plate, and prolong the service life of the vibration transmission plate.

Description

Vibration transmission sheet, loudspeaker assembly and bone conduction earphone

[0001] The present application relates to the technical field of electronic devices, in particular to a vibration transmission sheet, a loudspeaker assembly and a bone conduction earphone.

[0002] With the continuous popularity of electronic devices, electronic devices have become an indispensable social and entertainment tool in people's daily life, and people's requirements for electronic devices are also getting higher and higher. The earphone, such electronic devices, has been widely used in people's daily life, which can be used with terminal devices such as mobile phones and computers to provide users with an auditory feast. The current bone conduction earphone is usually equipped with a magnetic circuit and an electric circuit capable of generating electromagnetic induction, so that the earphone can realize vibration to realize bone conduction. The vibration transmission sheet is arranged in the bone conduction earphone to connect the magnetic circuit and the electric circuit to limit the positions of the two. However, the mutual movement of the two is easy to cause the vibration transmission sheet to be damaged, deformed and broken.

[0003]

[0004] The present application provides a vibration transmission sheet, a loudspeaker assembly and a bone conduction earphone, which can increase the rigidity of the vibration transmission sheet, improve the reliability of the vibration transmission sheet, and prolong the service life of the vibration transmission sheet.

[0005] In one aspect, the present application provides a vibration transmission sheet, which comprises an inner ring body, an outer ring body surrounding the periphery of the inner ring body, and a first connecting rod and a second connecting rod 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 comprises two first straight line segments arranged side by side and opposite to each other, and two first curved segments respectively connected to the adjacent ends of the two first straight line segments and protruding outwardly of the vibration transmission sheet, the outer ring body has a first outer ring edge arranged adjacent to the inner ring body, the first outer ring edge comprises 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 the adjacent first straight line segment and the second straight line segment, and form a curved gap between the adjacent first curved segment and the second curved segment.

[0006] 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 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 comprises 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 extension portion connected between the second inner connecting portion and the second outer connecting portion and located in the curved gap.

[0007] ​​​In some embodiments, the number of the first links and the second links are two respectively, and the two first links and the two second links are respectively 180-degree rotationally symmetrical relative to the center of mass or the centroid of the inner ring body.

[0008] In some embodiments, the first inner connecting part is adjacent to the second outer connecting part, and the first outer connecting part is adjacent to the second inner connecting part.

[0009] In some embodiments, the inner and outer side edges of the first curved segment, the second curved segment and the curved extension are respectively arranged in a circular arc shape with a common center, and the inner and outer side edges of the first straight segment, the second straight segment and the straight strip extension are arranged parallel to each other.

[0010] In some embodiments, the inner side edge of the curved extension is arranged in a circular arc shape, the inner side edge of the second inner connecting part includes a first circular arc segment connected with the first inner ring edge and a second circular arc segment connecting the first circular arc segment and the inner side edge of the curved extension, the ratio of the diameter of the first circular arc segment to the diameter of the inner side edge of the curved extension is between 0.02 and 0.03, and the ratio of the diameter of the second circular arc segment to the diameter of the inner side edge of the curved extension is between 0.11 and 0.14, the first circular arc segment and the second circular arc segment are concave arcs.

[0011] In some embodiments, the outer side edge of the second inner connecting part includes a third circular arc segment connected with the first inner ring edge and a fourth circular arc segment connecting the third circular arc segment and the outer side edge of the curved extension, the ratio of the diameter of the third circular arc segment to the diameter of the inner side edge of the curved extension and the ratio of the diameter of the fourth circular arc segment to the diameter of the inner side edge of the curved extension are between 0.16 and 0.2, the third circular arc segment is a concave arc, and the fourth circular arc segment is a convex arc.

[0012] In some embodiments, the diameter of the fourth circular arc segment is consistent with the diameter of the third circular arc segment.

[0013] In some embodiments, the ratio of the straight line distance from the connection point of the first circular arc segment and the first inner ring edge to the connection point of the third circular arc segment and the first inner ring edge to the width of the curved extension is between 2.65 and 3.25.

[0014] In some embodiments, the second inner connecting part is adjacent to the first outer connecting part, the outer side edge of the first outer connecting part includes a fifth circular arc segment connected with the first outer ring edge and a sixth circular arc segment connecting the fifth circular arc segment and the outer side edge of the straight strip extension, the ratio of the diameter of the fifth circular arc segment to the diameter of the inner side edge of the curved extension is between 0.02 and 0.03, the ratio of the diameter of the sixth circular arc segment to the diameter of the inner side edge of the curved extension is between 0.11 and 0.14, and the fifth circular arc segment and the sixth circular arc segment are concave arcs.

[0015] In some embodiments, the diameter of the fifth circular segment is consistent with the diameter of the first circular arc, and the diameter of the sixth circular segment is consistent with the diameter of the second circular arc.

[0016] In some embodiments, the inner side edge of the first outer connecting portion comprises a seventh circular segment connected with the first outer ring edge and an eighth circular segment connecting the seventh circular segment and the inner side edge of the straight strip extension portion, the connecting line between the center of the fourth circular segment and the center of the eighth circular segment has a midpoint, the included angle between the connecting line of the midpoint and the center of the inner side edge of the curved extension portion and the interval direction of the two first straight line segments is between 8° and 18°, the seventh circular segment is a concave arc, and the eighth circular segment is a convex arc.

[0017] In some embodiments, the included angle is between 11° and 15°.

[0018] In some embodiments, the ratio of the connecting length between the center of the fourth circular segment and the center of the eighth circular segment to the width of the curved extension portion or the straight strip extension portion is between 3.71 and 4.54.

[0019] In some embodiments, the width of the curved extension portion is within the range between the width value of the straight strip extension portion and the inner ring body width value.

[0020] In some embodiments, the ratio of the diameter of the seventh circular segment to the diameter of the inner side edge of the curved extension portion and the ratio of the diameter of the eighth circular segment to the diameter of the inner side edge of the curved extension portion is between 0.16 and 0.2.

[0021] In some embodiments, the diameters of the third circular segment, the fourth circular segment, the seventh circular segment, and the eighth circular segment are consistent.

[0022] In some embodiments, the straight line distance from the connecting point of the fifth circular segment and the first outer ring edge to the connecting point of the seventh circular segment and the first outer ring edge is greater than the straight line distance from the connecting point of the first circular segment and the first inner ring edge to the connecting point of the third circular segment and the first inner ring edge.

[0023] In some embodiments, the ratio of the straight line distance from the connecting point of the fifth circular segment and the first outer ring edge to the connecting point of the seventh circular segment and the first outer ring edge to the width of the straight strip extension portion is between 3.17 and 3.88.

[0024] In some embodiments, the connecting portions of the first connecting rod and the first inner ring edge and the first outer ring edge present smooth transition connections; the connecting portions of the second connecting rod and the first inner ring edge and the first outer ring edge also present smooth transition connections.

[0025] In another aspect, the present application provides a speaker assembly, the speaker assembly comprising a transducing device, the transducing device comprising a voice coil, a bracket, a magnetic circuit system and the vibration-transmitting sheet as in the above embodiments, the inner ring body of the vibration-transmitting sheet being connected to the bracket, the outer ring body being connected to the magnetic circuit system to elastically suspend the magnetic circuit system at the periphery of the bracket, and the voice coil being arranged on the bracket.

[0026] In another aspect, the present application provides a bone conduction earphone, the bone conduction earphone comprising the vibration-transmitting sheet as in the above embodiments.

[0027] The present application has the following beneficial effects: Different from the prior art, the present application connects the inner ring body and the outer ring body by the first connecting rod and the second connecting rod, the first connecting rod is arranged in the straight gap between the inner ring body and the outer ring body, the first connecting rod is provided with a straight extension part corresponding to the straight gap and the straight shape of the inner ring body and the outer ring body, 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 part corresponding to the curved gap and the curved shape of the inner ring body and the outer ring body. Therefore, the cooperation 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 inner ring body and the outer ring body 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-transmitting sheet and prolonging the service life of the vibration-transmitting sheet. BRIEF DESCRIPTION OF DRAWINGS

[0028] Fig. 1 is a schematic diagram of the overall structure of an embodiment of a bone conduction earphone provided by the present application;

[0029] Fig. 2 is a schematic diagram of the overall structure of an embodiment of a speaker assembly provided by the present application;

[0030] Fig. 3 is a schematic diagram of the overall structure of an embodiment of a transducing device provided by the present application;

[0031] Fig. 4 is a schematic diagram of the cross-sectional structure of the transducing device along the A-A cutting direction shown in Fig. 2;

[0032] Fig. 5 is a schematic diagram of the overall structure of an embodiment of a vibration-transmitting sheet provided by the present application;

[0033] Fig. 6 is an enlarged schematic diagram of the Q area in the vibration-transmitting sheet embodiment shown in Fig. 5;

[0034] Fig. 7 is another schematic diagram of the overall structure of the vibration-transmitting sheet embodiment shown in Fig. 5;

[0035] Fig. 8 is a schematic diagram of the stress distribution of the vibration-transmitting sheet embodiment shown in Fig. 5 under a load along the length direction;

[0036] Fig. 9 is a schematic diagram of the stress distribution of the vibration-transmitting sheet embodiment shown in Fig. 5 under a load along the width direction;

[0037] Figure 10 is a schematic diagram of the stress distribution of the vibration transmission plate embodiment shown in Figure 5 under an axial load along the axial direction.

[0038] Figure 11 is a schematic diagram of another stress distribution of the vibration transmission plate embodiment shown in Figure 5 under an axial load along the axial direction;

[0039] Figure 12 is a schematic diagram of the stress distribution of the vibration transducer embodiment shown in Figure 5 under a flipping load that flips around the width direction.

Detailed Implementation Methods

[0040] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be noted that the following embodiments are for illustrative purposes only and do not limit the scope of the application. Similarly, the following embodiments are only some, not all, embodiments of the present application, and all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present application.

[0041] The reference to "embodiment" in this application means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0042] The following is an exemplary description of bone conduction headphones based on an embodiment of the bone conduction headphones.

[0043] Bone conduction headphones 1 are headphones capable of generating bone conduction sound through bone conduction vibration and transmitting the bone conduction sound to the user. Optionally, as shown in FIG1, bone conduction headphones 1 may include a speaker assembly 10, which can be placed on the facial area in front of the tragus of the user's left ear and / or right ear, and conform to the user's facial area. The speaker assembly 10 is used to convert electrical signals containing relevant audio information into air conduction sound, and / or into bone conduction sound, and further transmit the bone conduction sound to the user.

[0044] In some embodiments, the bone conduction headphones 1 may further include a wearing component 20 and a microphone component 30. There may be two speaker components 10, one of which is placed on the facial area in front of the tragus of the user's left ear to transmit bone conduction sound and / or air conduction sound to the user's left ear, and the other speaker component 10 is placed on the facial area in front of the tragus of the user's right ear to transmit bone conduction sound and / or air conduction sound to the user's right ear.

[0045] The wearing assembly 20 can be connected with two speaker assemblies 10 respectively. The wearing assembly 20 can position the speaker assemblies 10 at the facial area in front of the tragus of the user. The two speaker assemblies 10 can be the same or different. For example, one speaker assembly 10 can be provided with the boom microphone assembly 30, and the other speaker assembly 103 can not be provided with the boom microphone assembly 30. For example, one speaker assembly 10 is used to deliver bone conduction sound to the user, and the other speaker assembly 103 is used to deliver air conduction sound to the user.

[0046] In some embodiments, as shown in FIG. 2, the speaker assembly 10 can include a transducing device 11, which is the main device for converting an electrical signal into bone conduction sound in the speaker assembly 10.

[0047] Optionally, as shown in FIG. 3 and FIG. 4, the transducing device 11 can include a voice coil 100, a bracket 200, a magnetic circuit system 300, and a vibration transmission sheet 400. The vibration transmission sheet 400 connects the bracket 200 and the magnetic circuit system 300 to elastically suspend the magnetic circuit system 300 at the periphery of the bracket 200, and the voice coil 100 is arranged on the bracket 200 and cooperates with the magnetic circuit system 300. Specifically, when the voice coil 100 is connected to 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.

[0048] In the voice coil 100, the voice coil 100 can be connected to an electrical signal containing relevant audio information, and the bracket 200 can be arranged inside the magnetic circuit system 300. The voice coil 100 can be fixed on the bracket 200 by winding 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 connected to an electrical signal containing relevant audio information can interact with the magnetic field of the magnetic circuit system 300. It can be understood that the radial direction of the bracket 200 can be perpendicular to the vibration direction of the bracket 200, of course, in some scenarios, when disturbed 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.

[0049] Specifically, since the voice coil 100 is opposite to the magnetic circuit system 300 in the radial direction of the transducing device 11, the electric field of the voice coil 100 and the magnetic field of the magnetic circuit system 300 can interact, thereby generating electromagnetic reaction, so that the magnetic circuit system 300 and the bracket 200 where the voice coil 100 is arranged produce mutual motion, so that the transducing device 11 produces vibration and generates bone conduction sound capable of delivering relevant audio information.

[0050] The transmission sheet 400 can be elastically deformed under the action of an external force, and can restore to the original shape after the external force is removed. Since the transmission sheet 400 is connected to the support 200 and the magnetic circuit system 300 respectively, when the magnetic circuit system 300 and the voice coil 100 move relative to each other, the magnetic circuit system 300 and the support 200 on which the voice coil 100 is arranged move relative to each other, and the transmission sheet 400 can elastically constrain the magnetic circuit system 300 and the support 200 on which the voice coil 100 is arranged, so as to limit the support 200 in the magnetic circuit system 300, so that the operation of the transducer 11 can be kept stable.

[0051] In some embodiments, the transmission sheet 400 can be made of a metal material, which can include but is not limited to steel (for example, stainless steel, carbon steel, etc.), light alloy (for example, aluminum alloy, beryllium copper, magnesium alloy, titanium alloy, etc.). In some embodiments, the transmission sheet 400 can also be made of other single or composite materials that can achieve the same performance. For example, the composite material can include but is not limited to glass fiber, carbon fiber, boron fiber, graphite fiber, silicon carbide fiber, or aramid fiber, etc.

[0052] In some embodiments, as shown in FIG. 5, the transmission sheet 400 can include an inner ring body 410, an outer ring body 420 surrounding the periphery of 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.

[0053] Wherein the inner ring body 410 of the transmission sheet 400 is connected to the support 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 support 200 and the magnetic circuit system 300 move relative to each other, the first connecting rod 430 and the second connecting rod 440 can be elastically deformed, 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 support 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 also bear a larger tensile force.

[0054] Specifically, as shown in FIG. 5, the inner ring body 410 can have a first inner ring edge 411 disposed adjacent to the outer ring body 420, the first inner ring edge 411 can include two first straight line segments 4111 disposed side by side and opposite to each other, and two first curved line segments 4112 respectively connecting adjacent ends of the two first straight line segments 4111 and protruding outward of the vibration transmission sheet 400. The outer ring body 420 can have a first outer ring edge 421 disposed adjacent to the inner ring body 410, the first outer ring edge 421 can include two second straight line segments 4211 respectively located outside the two first straight line segments 4111, and two second curved line segments 4212 respectively located outside the two first curved line segments 4112, thereby forming a straight gap 401 between adjacent first and second straight line segments 4111 and 4211, and forming a curved gap 402 between adjacent first and second curved line segments 4112 and 4212.

[0055] The first connecting rod 430 and the second connecting rod 440 can be connected to the inner ring body 410 at one end and to the outer ring body 420 at the other end, so that the inner ring body 410 and the outer ring body 420 can be more stably connected by the first connecting rod 430 and the second connecting rod 440 when the inner ring body 410 and the outer ring body 420 are moved by the support 200 and the magnetic circuit system 300.

[0056] Specifically, as shown in FIG. 5, the first connecting rod 430 can 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 extension portion 433 connected between the first inner connecting portion 431 and the first outer connecting portion 432 and located in the straight gap 401.

[0057] As shown in FIG. 5, the second connecting rod 440 can 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.

[0058] The first connecting rod 430 is arranged corresponding to the first straight line segment 4111 and the second straight line segment 4211, and the second connecting rod 440 is arranged corresponding to the first curved line segment 4112 and the second curved line segment 4212. In this way, 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 can be reduced, so that the sensitivity of the relative movement of the inner ring body 410 and the outer ring body 420 can be maintained when the inner ring body 410 moves relative to the outer ring body 420, thereby improving the effect of the bone conduction earphone 1 on transmitting bone conduction vibration to transmit bone conduction sound, and increasing the rigidity of the vibration transmitting sheet 400 in the radial direction (e.g., the direction perpendicular to the thickness direction of the vibration transmitting sheet 400 in FIG. 5), so that the first connecting rod 430 and the second connecting rod 440 are not easy to break, thereby improving the reliability and service life of the vibration transmitting sheet 400.

[0059] In some embodiments, as shown in FIG. 5, 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 respectively rotationally symmetrical about the centroid or the center of mass of the inner ring body 410 by 180 degrees. 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 opposite to each other in the spacing direction of the two first straight line segments 4111, and the two second connecting rods 440 are arranged opposite to each other in the spacing direction of the two first curved line segments 4112. Wherein, the spacing direction of the two first straight line segments 4111 is shown by the direction of the X arrow in FIG. 5, and the spacing direction of the two first curved line segments 4112 is shown by the direction of the Y arrow in FIG. 5. Wherein, the direction of the X arrow and the direction of the Y arrow can be perpendicular to the radial direction of the vibration transmitting sheet 400.

[0060] 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 line segments 4112 and the two second curved line segments 4212. In this way, the connection between the inner ring body 410 and the outer ring body 420 can be more stable, so as to increase the rigidity of the vibration transmitting sheet 400 and improve the reliability and service life of the vibration transmitting sheet 400.

[0061] In some embodiments, as shown in FIG. 5, the first inner connecting portion 431 and the second outer connecting portion 442 can be arranged adjacent to each other in the circumferential direction of the vibration transmitting sheet 400, and the first outer connecting portion 432 and the second inner connecting portion 441 can be arranged adjacent to each other in the circumferential direction of the vibration transmitting sheet 400.

[0062] Since the first connecting rod 430 is connected with the first inner ring edge 411 through the first inner connecting part 431 and connected with the first outer ring edge 421 through the first outer connecting part 432, and the second connecting rod 440 is connected with the first outer ring edge 421 through the second outer connecting part 442 and connected with the first inner ring edge 411 through the second inner connecting part 441, the first inner connecting part 431 and the second inner connecting part 441 connected with the inner ring body 410 are not adjacent and are far away from each other as much as possible, and the first inner connecting part 431 and the second inner connecting part 441 connected with the outer ring body 420 are not adjacent and are far away from each other as much as possible. In this way, the inner ring body 410 and the outer ring body 420 can be pulled and constrained by the first connecting rod 430 and the second connecting rod 440 during relative movement, thereby reducing the stress concentration on the connection between the inner ring body 410 and the first connecting rod 430 and the connection between the outer ring body 420 and the second connecting rod 440, and reducing the occurrence of fracture of the transmission sheet 400, thereby improving the reliability of the transmission sheet 400.

[0063] In some embodiments, as shown in FIG. 5, the inner and outer edges of the first curved segment 4112, the second curved segment 4212 and the curved extension 443 can be arranged in a circular arc shape with a common center, and the inner and outer edges of the first straight line segment 4111, the second straight line segment 4211 and the straight extension 433 are arranged parallel to each other.

[0064] Specifically, the two ends of the first straight line segment 4111 are respectively connected to the two first curved segments 4112, and the two ends of the second straight line segment 4211 are also respectively connected to the two second curved segments 4212, so that the inner ring body 410 and the outer ring body 420 present an oval racetrack shape.

[0065] And the curved extension 443 and the first curved segment 4112 and the second curved segment 4212 have a common center, and the inner and outer edges of the straight extension 433 are arranged parallel to the first straight line segment 4111 and the second straight line segment 4211, so that the curved extension 443 and the straight extension 433 are not easy to contact 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 stiffness of the transmission sheet 400, so that the curved extension 443 and the straight extension 433 are not easy to be damaged during the relative movement of the inner ring body 410 and the outer ring body 420.

[0066] In some embodiments, as shown in FIG. 5, 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.

[0067] Specifically, the first connecting rod 430 is smoothly connected with the first inner ring edge 411 through the first inner connecting portion 431, and is smoothly connected with the first outer ring edge 421 through the first outer connecting portion 432. The second connecting rod 440 is smoothly connected with the first inner ring edge 411 through the second inner connecting portion 441, and is smoothly connected with the first outer ring edge 421 through the second outer connecting portion 442.

[0068] In this way, the connection strength of the first connecting rod 430 with the inner ring body 410 and the outer ring body 420 can be improved, and the connection strength of the second connecting rod 440 with the inner ring body 410 and the outer ring body 420 can be improved, so that the bending resistance of the first connecting rod 430 and the second connecting rod 440 can be improved, and the first connecting rod 430 and the second connecting rod 440 are less likely to be damaged due to bending when elastically deformed, thereby prolonging the service life of the vibration transmission sheet 400.

[0069] In some embodiments, the straight extension portion 433 is smoothly connected with the first inner connecting portion 431 and the first outer connecting portion 432, the first inner connecting portion 431 is smoothly connected with the first inner ring edge 411, and the first outer connecting portion 432 is smoothly connected with the first outer ring edge 421. The curved extension portion 443 is smoothly connected with the second inner connecting portion 441 and the second outer connecting portion 442, the second inner connecting portion 441 is smoothly connected with the first inner ring edge 411, and the second outer connecting portion 442 is smoothly connected with the first outer ring edge 421.

[0070] In this way, the strength of the first connecting rod 430 and the second connecting rod 440 can be improved, so that the bending resistance of the first connecting rod 430 and the second connecting rod 440 can be improved, and the first connecting rod 430 and the second connecting rod 440 are less likely to be damaged due to bending when deformed, thereby prolonging the service life of the vibration transmission sheet 400.

[0071] In some embodiments, as shown in FIG. 5 and FIG. 6, the inner side edge of the curved extension portion 443 can be arranged in a circular arc shape. The inner side edge of the second inner connecting portion 441 can include a first circular arc segment 4411 connected with the first inner ring edge 411 and a second circular arc segment 4412 connecting the first circular arc segment 4411 and the inner side edge of the curved extension portion 443. The first circular arc segment 4411 and the second circular arc segment 4412 are connected at the short dashed line. The inner side edge of the curved extension portion 443 refers to the side of the curved extension portion 443 facing the first inner ring edge 411, and the inner side edge of the second inner connecting portion 441 refers to the edge of the second inner connecting portion 441 opposite to the inner side edge of the curved extension portion 443 and connected with the first inner ring edge 411.

[0072] Since, when the second connecting rod 440 is elastically deformed, the internal stress of the second connecting rod 440 is concentrated on the inner side edge of the curved extension 443 and the inner side edge of the second inner connecting portion 441, if the inner side edge of the curved extension 443 and the inner side edge of the second inner connecting portion 441 are provided in other shapes, such as a clamped angle type, the stress of the second connecting rod 440 is concentrated on the clamped angle when the second connecting rod 440 is elastically deformed, thereby easily causing the vibration transmission sheet 400 to be torn from the clamped angle.

[0073] Therefore, by providing the inner side edge of the curved extension 443 in a circular arc shape and the inner side edge of the second inner connecting portion 441 in a multi-segment circular arc shape, the internal stress concentration can be reduced when the curved extension 443 and the second inner connecting portion 441 are elastically deformed, thereby improving the bending resistance of the curved extension 443 and the second inner connecting portion 441, and preventing damage from occurring during elastic deformation, so as to improve the reliability and service life of the vibration transmission sheet 400.

[0074] Of course, in other embodiments, the inner side edge of the curved extension 443 and the inner side edge of the second inner connecting portion 441 can also be provided in other shapes, such as a wave shape, a broken line shape, etc., which will not be specifically enumerated one by one in this embodiment.

[0075] Optionally, as shown in FIG. 6, the first circular arc segment 4411 and the second circular arc segment 4412 can both be concave arcs. By providing the first circular arc segment 4411 and the second circular arc segment 4412 as concave arcs, the inner side edge of the second inner connecting portion 441 can be made smoother, thereby achieving a natural transition connection between the curved extension 443 and the first inner ring edge 411, and enhancing the connection strength of the connection between the curved extension 443 and the inner ring body 410 through the second inner connecting portion 441.

[0076] Optionally, the ratio of the diameter of the first circular arc segment 4411 to the diameter of the inner side edge of the curved extension 443 can be between 0.02 and 0.03, and the ratio of the diameter of the second circular arc segment 4412 to the diameter of the inner side edge of the curved extension 443 can be between 0.11 and 0.14.

[0077] Specifically, if the ratio of the diameter of the first arc segment 4411 to the diameter of the inner side edge of the curved extension 443 is greater than 0.03 and the ratio of the diameter of the second arc segment 4412 to the diameter of the inner side edge of the curved extension 443 is greater than 0.14, the diameters of the first arc segment 4411 and the second arc segment 4412 will be too large, the distance between the inner side edge of the curved extension 443 and the first inner ring edge 411 will be too wide, and the tension that the curved extension 443 bears when the curved extension 443 restricts the inner ring body 410 will be increased, so that the curved extension 443 bears greater stress and is prone to deformation and fracture. If the ratio of the diameter of the first arc segment 4411 to the diameter of the inner side edge of the curved extension 443 is less than 0.02 and the ratio of the diameter of the second arc segment 4412 to the diameter of the inner side edge of the curved extension 443 is less than 0.11, when the curved extension 443 and the second inner connecting portion 441 elastically deform, the stress will be too concentrated at the second inner connecting portion 441, so that the second inner connecting portion 441 is prone to fracture.

[0078] Therefore, the ratio of the diameter of the first arc segment 4411 to the diameter of the inner side edge of the curved extension 443 is set to 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 side edge of the curved extension 443 is set to be between 0.11 and 0.14, so that the vibration sensitivity of the transmission sheet 400 can be improved, the stress of the curved extension 443 and the second inner connecting portion 441 can be effectively dispersed, stress concentration can be reduced, the bending resistance of the curved extension 443 and the second inner connecting portion 441 can be improved, and the curved extension 443 and the second inner connecting portion 441 are not prone to fracture during elastic deformation.

[0079] For example, the ratio of the diameter of the first arc segment 4411 to the diameter of the inner side 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 side edge of the curved extension 443 can be set to 0.1095, 0.1168, or 0.121, etc.

[0080] In some embodiments, as shown in FIG. 6, the outer side edge of the second inner connecting portion 441 can be disposed opposite to the inner side edge of the second inner connecting portion 441. The outer side edge of the second inner connecting portion 441 can include a third circular arc segment 4413 connected with the first inner ring edge 411 and a fourth circular arc segment 4414 connecting the third circular arc segment 4413 and the outer side edge of the curved extension 443. The third circular arc segment 4413 and the fourth circular arc segment 4414 are connected at the short dashed line. The outer side edge of the curved extension 443 can be the side of the curved extension 443 facing the first outer ring edge 421, and the outer side edge of the second inner connecting portion 441 can refer to the side of the second inner connecting portion 441 connecting the first inner ring edge 411 and the outer side edge of the curved extension 443.

[0081] Optionally, as shown in FIG. 6, the third circular arc segment 4413 can be a concave arc, and the fourth circular arc segment 4414 can be a convex arc. By setting the third circular arc segment 4413 as a concave arc, the third circular arc segment 4413 can be naturally and smoothly connected with the first inner ring edge 411. By setting the fourth circular arc segment 4414 as a convex arc, the fourth circular arc segment 4414 can be naturally and smoothly connected with the third circular arc segment 4413 and the outer side edge of the curved extension 443, thereby enhancing the connection strength of the curved extension 443 and the inner ring body 410 through the second inner connecting portion 441.

[0082] Optionally, the ratio of the diameter of the third circular arc segment 4413 to the diameter of the inner side edge of the curved extension 443 and the ratio of the diameter of the fourth circular arc segment 4414 to the diameter of the inner side edge of the curved extension 443 are between 0.16 and 0.2.

[0083] 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 side edge of the curved extension 443 is greater than 0.2, the distance between the curved extension 443 and the first inner ring edge 411 will be wide, and the tension that the curved extension 443 bears when the inner ring body 410 is constrained will increase, so that the curved extension 443 bears greater stress and is 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 side edge of the curved extension 443 is less than 0.16, the connection between the outer side edge of the second inner connecting portion 441 and the inner side edge of the curved extension 443 will tend to be a right angle or an acute angle, and the connection between the outer side edge of the second inner connecting portion 441 and the first inner ring edge 411 will also tend to be a right angle or an acute angle, so that when the curved extension 443 and the second inner connecting portion 441 are elastically deformed, the stress will be too concentrated on the second inner connecting portion 441, so that the second inner connecting portion 441 is prone to fracture. Therefore, the ratio of the diameter of the third arc segment 4413 to the diameter of the inner side edge of the curved extension 443 and the ratio of the diameter of the fourth arc segment 4414 to the diameter of the inner side edge of the curved extension 443 are between 0.16 and 0.2, so that the stress of the curved extension 443 and the second inner connecting portion 441 is dispersed, thereby improving the reliability of the transmission sheet 400.

[0084] For example, the ratio of the diameter of the third arc segment 4413 to the diameter of the inner side edge of the curved extension 443 and the ratio of the diameter of the fourth arc segment 4414 to the diameter of the inner side edge of the curved extension 443 can be set to 0.1732, 0.181, or 0.1957, etc.

[0085] In some embodiments, the diameter of the fourth arc segment 4414 can be consistent with the diameter of the third arc segment 4413. In this way, when the second inner connecting portion 441 is elastically deformed, the stress at the third arc segment 4413 and the fourth arc segment 4414 is more uniform, thereby increasing the connection strength of the curved extension 443 and the inner ring body 410 connected through the second inner connecting portion 441.

[0086] In some embodiments, the ratio of the straight-line distance between the connection point of the first arc segment 4411 and the first inner ring edge 411 to the connection point of the third arc segment 4413 and the first inner ring edge 411 to the width of the curved extension 443 can be between 2.65 and 3.25.

[0087] The straight line distance from the connecting point of the first arc segment 4411 to the first inner ring edge 411 to the connecting point of the third arc segment 4413 to the first inner ring edge 411 is the width of the connecting position of the second inner connecting portion 441 to the first inner ring edge 411. Specifically, the straight line distance from the connecting point of the first arc segment 4411 to the first inner ring edge 411 to the connecting point of the third arc segment 4413 to the first inner ring edge 411 can be denoted as length H1 in FIG. 6, and the width of the curved extension portion 443 can be denoted as length h1 in FIG. 6.

[0088] The width of the connecting position of the second inner connecting portion 441 to the first inner ring edge 411 is set to correspond to the width of the curved extension portion 443, so that the connecting strength of the connecting position of the second inner connecting portion 441 to the first inner ring edge 411 is stronger.

[0089] Specifically, if the ratio of the straight line distance from the connecting point of the first arc segment 4411 to the first inner ring edge 411 to the connecting point of the third arc segment 4413 to the first inner ring edge 411 to the width of the curved extension portion 443 is less than 2.65, the connecting position of the second inner connecting portion 441 to the first inner ring edge 411 will be relatively weak, and the second inner connecting portion 441 will be prone to breakage when it is elastically deformed. If the ratio of the straight line distance from the connecting point of the first arc segment 4411 to the first inner ring edge 411 to the connecting point of the third arc segment 4413 to the first inner ring edge 411 to the width of the curved extension portion 443 is greater than 3.25, the connecting position of the second inner connecting portion 441 to the first inner ring edge 411 will be too wide, and the second inner connecting portion 441 will excessively limit the movement of the inner ring body 410, thereby reducing the vibration sensitivity of the transmission sheet 400, reducing the sensitivity of the transduction device 11, and affecting the bone conduction effect of the bone conduction earphone 1. Therefore, the ratio of the above straight line distance to the width of the curved extension portion 443 is set to be between 2.65 and 3.25, which can improve the sensitivity of the transmission sheet 400 while improving the bending deformation resistance of the transmission sheet 400, thereby improving the reliability of the transmission sheet 400.

[0090] For example, in some embodiments, the ratio of the straight line distance from the connecting point of the first arc segment 4411 to the first inner ring edge 411 to the connecting point of the third arc segment 4413 to the first inner ring edge 411 to the width of the curved extension portion 443 can be 2.78, 2.95, or 3.187, etc.

[0091] In some embodiments, the second inner connecting portion 441 can be disposed adjacent to the first outer connecting portion 432. As shown in FIG. 6, the outer side edge of the first outer connecting portion 432 can include a fifth circular arc segment 4321 connected with the first outer ring edge 421 and a sixth circular arc segment 4322 connecting the fifth circular arc segment 4321 and the outer side edge of the straight strip extension 433. Among them, the fifth circular arc segment 4321 and the sixth circular arc segment 4322 are connected at the short dashed line. The outer side edge of the straight strip extension 433 refers to the side of the straight strip extension 433 facing the first outer ring edge 421, and the outer side edge of the first outer connecting portion 432 refers to the edge of the first outer connecting portion 432 connecting the first outer ring edge 421 and the outer side edge of the straight strip extension 433, and the edge connecting the outer side edge of the straight strip extension 433.

[0092] Optionally, as shown in FIG. 6, the fifth circular arc segment 4321 and the sixth circular arc segment 4322 can be concave arcs. Among them, the fifth circular arc segment 4321 and the sixth circular arc segment 4322 are set as concave arcs, so that the outer side edge of the first outer connecting portion 432 is smoother, thereby realizing natural transition connection of the curved extension 443 and the first outer ring edge 421, and enhancing the connection strength of the connection of the first inner connecting portion 431 and the outer ring body 420 through the first outer connecting portion 432.

[0093] Optionally, the ratio of the diameter of the fifth circular arc segment 4321 to the diameter of the inner side edge of the curved extension 443 is between 0.02-0.03, and the ratio of the diameter of the sixth circular arc segment 4322 to the diameter of the inner side edge of the curved extension 443 is between 0.11-0.14.

[0094] Among them, the diameters of the fifth circular arc segment 4321 and the sixth circular arc segment 4322 are also set in association with the diameter of the curved extension 443, which can make the outer side edge of the first outer connecting portion 432 correspond to the second inner connecting portion 441. When the first connecting rod 430 and the second connecting rod 440 are elastically deformed under stress, the stress borne by the first connecting rod 430 and the second connecting rod 440 is equivalent, so that the stress can be uniform, and the reliability of the transmission sheet 400 can be provided.

[0095] Specifically, if the ratio of the diameter of the fifth circular arc segment 4321 to the diameter of the outer side edge of the curved extension 443 is greater than 0.03 and the ratio of the diameter of the sixth circular arc segment 4322 to the diameter of the outer side edge of the curved extension 443 is greater than 0.14, the diameter of the fifth circular arc segment 4321 and the diameter of the sixth circular arc segment 4322 will be too large, so that the distance between the straight extension 433 and the first outer ring edge 421 is too wide, which will increase the tension borne by the straight extension 433, so that the straight extension 433 bears a greater stress and is prone to deformation and fracture. If the ratio of the diameter of the fifth circular arc segment 4321 to the diameter of the outer side edge of the curved extension 443 is less than 0.02 and the ratio of the diameter of the sixth circular arc segment 4322 to the diameter of the outer side edge of the curved extension 443 is less than 0.11, the connection between the outer side edge of the first outer connecting portion 432 and the inner side edge of the straight extension 433 will tend to be a right angle or an acute angle, and the connection between the outer side edge of the first outer connecting portion 432 and the first outer ring edge 421 will also tend to be a right angle or an acute angle. Therefore, when the straight extension 433 and the first outer connecting portion 432 are elastically deformed, the stress will be too concentrated at the first outer connecting portion 432, so that the first outer connecting portion 432 is prone to fracture, and the restraint of the straight extension 433 on the inner ring body 410 is also increased, thereby affecting the vibration sensitivity of the vibration transmission sheet 400.

[0096] Therefore, the ratio of the diameter of the fifth circular arc segment 4321 to the diameter of the outer side edge of the curved extension 443 is set to be between 0.02 and 0.03, and the ratio of the diameter of the sixth circular arc segment 4322 to the diameter of the outer side edge of the curved extension 443 is set to be between 0.11 and 0.14, which can effectively disperse the stress at the first outer connecting portion 432 and reduce stress concentration, thereby improving the bending resistance of the straight extension 433 and the first outer connecting portion 432, so that they are not prone to fracture and damage during elastic deformation.

[0097] For example, in some embodiments, the ratio of the diameter of the fifth circular arc segment 4321 to the diameter of the outer side edge of the curved extension 443 can be 0.0254, 0.0270, 0.0285, etc. The ratio of the diameter of the sixth circular arc segment 4322 to the diameter of the outer side edge of the curved extension 443 can be set to 0.1095, 0.1168, or 0.121, etc.

[0098] In some embodiments, the diameter of the fifth circular segment 4321 can be consistent with the diameter of the first circular segment 4411, and the diameter of the sixth circular segment 4322 can be consistent with the diameter of the second circular segment 4412. In this way, the inner side edge of the second inner connecting portion 441 and the outer side edge of the first outer connecting portion 432 can be arranged consistently, 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, thereby reducing the problem of stress concentration of the first connecting rod 430 and the second connecting rod 440. Moreover, the adjacent arrangement of 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 also reduce the problem of excessive stress concentration of 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.

[0099] In some embodiments, as shown in FIG. 6, the inner side edge of the first outer connecting portion 432 can include a seventh circular segment 4323 connected with the first outer ring edge 421 and an eighth circular segment 4324 connecting the seventh circular segment 4323 and the inner side edge of the straight strip extension 433. The seventh circular segment 4323 and the eighth circular segment 4324 are connected at the short dashed line in FIG. 6. The inner side edge of the straight strip extension 433 refers to the side of the straight strip extension 433 facing the inner ring body 410, and the inner side edge of the first outer connecting portion 432 refers to the side of the first outer connecting portion 432 connecting the inner side edge of the straight strip extension 433 and the first outer ring edge 421.

[0100] The seventh circular segment 4323 can be a concave arc, and the eighth circular segment 4324 can be a convex arc. In this way, the inner side edge of the first outer connecting portion 432 can be naturally connected and transitioned with the first outer ring edge 421 and the inner side edge of the straight strip extension 433, thereby enhancing the connection strength of the second inner connecting portion 441.

[0101] Optionally, as shown in FIG. 7, the line connecting the center of the fourth circular segment 4414 and the center of the eighth circular segment 4324 has a midpoint, and the angle formed between the line connecting the midpoint and the center of the inner side edge of the curved extension 443 and the interval direction of the two first straight line segments 4111 is between 8° and 18°. The above-mentioned midpoint can be seen in the midpoint D in FIG. 7, the center of the inner side edge of the curved extension 443 can be seen in the center E in FIG. 7, and the angle formed between the line connecting the midpoint D and the center E of the inner side edge of the curved extension 443 and the interval direction of the two first straight line segments 4111 can be seen in the angle a shown in FIG. 7.

[0102] Specifically, according to the above-mentioned included angle a, the positions of the fourth circular arc segment 4414 and the eighth circular arc segment 4324 corresponding to the outer side edge of the inner ring body 410 can be determined, and the positions of the first inner connecting portion 431 and the second outer connecting portion 442 can be further determined, so that the setting of the first inner connecting portion 431 and the second outer connecting portion 442 can be adjusted accordingly, and the length and stress state of the first connecting rod 430 and the second connecting rod 440 can be further adjusted, so that the stress state of the transmission sheet 400 in the radial direction, especially in the interval direction of the two first linear segments 4111 and the interval direction of the two first curved segments 4112, can be adjusted.

[0103] The included angle a formed by the connecting line of the center of the fourth circular arc segment 4414 and the center of the eighth circular arc segment 4324 and the interval direction of the two first linear segments 4111 is set to be between 8° and 18°, which can ensure that the stress of the first connecting rod 430 and the second connecting rod 440 is more balanced, thereby reducing the phenomenon of stress concentration, and can also correspondingly ensure the rigidity of the transmission sheet 400 in the interval direction of the two first linear segments 4111 and the interval direction of the two first curved segments 4112. If the included angle a is less than 8° or greater than 18°, the stress will be too concentrated in the interval direction of the two first linear segments 4111 or the interval direction of the two first curved segments 4112, and the rigidity in the other direction will also be reduced, so that the transducer 11 is prone to breakage when vibrating.

[0104] In some embodiments, the included angle a can be between 11° and 15°. In this way, the rigidity of the transmission sheet 400 in each direction can be further ensured while the stress of the first connecting rod 430 and the second connecting rod 440 is more balanced. For example, the included angle a can be 12°, 13°, or 14°, etc.

[0105] In some embodiments, the ratio of the connecting length of the center of the fourth circular arc segment 4414 and the center of the eighth circular arc segment 4324 to the width of the curved extension 443 or the straight strip extension 433 is between 3.71 and 4.54. The connecting length of the center of the fourth circular arc segment 4414 and the center of the eighth circular arc segment 4324 can be seen as the length F shown in FIG. 7, and the width of the straight strip extension 433 can be seen as the length h2 shown in FIG. 6.

[0106] As can be seen from FIG. 7, the distance between the center of the fourth circular segment 4414 and the center of the eighth circular segment 4324 is related to the radii of curvature of the fourth circular segment 4414 and the eighth circular segment 4324 and the distance between the fourth circular segment 4414 and the eighth circular segment 4324, and the radii of curvature of the fourth circular segment 4414 and the eighth circular segment 4324 are also related to the degree of change in the transition of the connection between the first outer connecting portion 432 and the second inner connecting portion 441 and the inner ring body 410 and the outer ring body 420. Therefore, the length of the connection between the center of the fourth circular segment 4414 and the center of the eighth circular segment 4324 is associated with the width of the curved extension 443 or the straight strip extension 433, which can adjust the degree of connection of the change in the transition of the connection between the first outer connecting portion 432 and the inner ring body 410 and the outer ring body 420, and can also adjust the degree of connection of the change in the transition of the connection between the second inner connecting portion 441 and the inner ring body 410 and the outer ring body 420, and can also adjust the distance between the first outer connecting portion 432 and the second inner connecting portion 441.

[0107] Furthermore, 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 are elastically deformed, the stress inside the first connecting rod 430 and the second connecting rod 440 is usually concentrated at the second outer connecting portion 442 and the second inner connecting portion 441, so the radii of curvature of the fourth circular segment 4414 and the eighth circular segment 4324 are associated with the width of the curved extension 443 or the straight strip extension 433, so the stability at the first outer connecting portion 432 and the second inner connecting portion 441 can be adjusted accordingly, so as to further control the position of the stress concentration, so that the first outer connecting portion 432 and the second inner connecting portion 441 are not prone to breaking due to stress concentration, thereby improving the stability of the transmission sheet 400.

[0108] If the ratio of the length of the connection between the center of the fourth circular segment 4414 and the center of the eighth circular segment 4324 to the width of the curved extension 443 is less than 3.71, or the ratio of the length of the connection between the center of the fourth circular segment 4414 and the center of the eighth circular segment 4324 to the width of the straight strip extension 433 is less than 3.71, then the radii of curvature of the fourth circular segment 4414 and the eighth circular segment 4324 will be too small, or the distance between the fourth circular segment 4414 and the eighth circular segment 4324 will be too small, and in addition, when the first connecting rod 430 and the second connecting rod 440 are elastically deformed, the internal stress will 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 prone to breaking, and also causing the connection between the second connecting rod 440 and the inner ring body 410 and the outer ring body 420 to be prone to breaking.

[0109] If the ratio of the length of the connection between the center of the fourth circular segment 4414 and the center of the eighth circular segment 4324 to the width of the curved extension 443 or the straight extension 433 is greater than 4.54, the radius of curvature of the fourth circular segment 4414 and the eighth circular segment 4324 is too large, the width of the second outer connecting portion 442 and the second inner connecting portion 441 is too large, or the distance between the fourth circular segment 4414 and the eighth circular segment 4324 is 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 transmission vibration piece 400.

[0110] Therefore, the ratio of the length of the connection between the center of the fourth circular segment 4414 and the center of the eighth circular segment 4324 to the width of the curved extension 443 or the straight extension 433 is set to be between 3.71 and 4.54, which can maintain the vibration sensitivity of the transmission vibration piece 400 while strengthening the connection strength of the second outer connecting portion 442 and the second inner connecting portion 441, so that the second outer connecting portion 442 and the second inner connecting portion 441 are not prone to breaking due to stress concentration, thereby improving the radial stiffness of the transmission vibration piece 400 to improve the stability and reliability of the transmission vibration piece 400. For example, the ratio of the length of the connection between the center of the fourth circular segment 4414 and the center of the eighth circular segment 4324 to the width of the curved extension 443 or the straight extension 433 can be 3.862, 4.12, or 4.374, etc.

[0111] In some embodiments, the width of the curved extension 443 can be between the width value of the straight extension 433 and the width value of the inner ring body 410. In this way, the curved extension 443 can not easily affect the vibration sensitivity of the transmission vibration piece 400.

[0112] Optionally, in some embodiments, the width of the curved extension 443 can be consistent with the width of the straight extension 433, and the width of the curved extension 443 and the width of the straight extension 433 can both be less than the width of the inner ring body 410, thereby further ensuring the vibration sensitivity of the transmission vibration piece 400. For example, the width of the curved extension 443 and the width of the straight extension 433 can both be 0.3 mm, 0.34 mm, 0.4 mm, or 0.45 mm, etc.

[0113] In some embodiments, the ratio of the diameter of the seventh circular segment 4323 to the diameter of the inner side edge of the curved extension 443 and the ratio of the diameter of the eighth circular segment 4324 to the diameter of the inner side edge of the curved extension 443 is between 0.16 and 0.2.

[0114] In this way, the shapes of the seventh arc segment 4323 and the eighth arc segment 4324 are 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 side edge of the curved extension 443 and the ratio of the diameter of the eighth arc segment 4324 to the diameter of the inner side edge of the curved extension 443 are between 0.16 and 0.2, which can disperse the stress at the first outer connecting portion 432, thereby improving the reliability of the vibration transmission sheet 400.

[0115] For example, the ratio of the diameter of the seventh arc segment 4323 to the diameter of the inner side edge of the curved extension 443 and the ratio of the diameter of the eighth arc segment 4324 to the diameter of the inner side edge of the curved extension 443 can be set to 0.1732, 0.181, or 0.1957, etc.

[0116] 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 exhibit similar shapes, so that when the first outer connecting portion 432 and the second inner connecting portion 441 elastically deform, 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 sheet 400.

[0117] 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 diameters of 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, which are not specifically limited in the present embodiment.

[0118] In some embodiments, as shown in FIG. 6, the straight-line distance from the connection point of the fifth arc segment 4321 to the first outer ring edge 421 to the connection point of the seventh arc segment 4323 to the first outer ring edge 421 is greater than the straight-line distance from the connection point of the first arc segment 4411 to the first inner ring edge 411 to the connection point of the third arc segment 4413 to the first inner ring edge 411.

[0119] Specifically, the straight-line distance from the connection point of the fifth arc segment 4321 to the first outer ring edge 421 to the connection point of the seventh arc segment 4323 to the first outer ring edge 421 is shown as length H2 in FIG. 6.

[0120] The straight line distance from the connecting point of the fifth circular segment 4321 to the first outer ring edge 421 to the connecting point of the seventh circular segment 4323 to the first outer ring edge 421 is the width of the connecting position of the first connecting rod 430 to the first outer ring edge 421. The straight line distance from the connecting point of the first circular segment 4411 to the first inner ring edge 411 to the connecting point of the third circular segment 4413 to the first inner ring edge 411 is the width of the connecting position of the second connecting rod 440 to the first inner ring edge 411.

[0121] Since the first outer ring edge 421 is located outside the first inner ring edge 411, when the inner ring body 410 and the outer ring body 420 move relative to each other, the movement amplitude of the first outer ring edge 421 is larger, so a larger restraining force is needed to constrain the outer ring body 420. Therefore, the straight line distance from the connecting point of the fifth circular segment 4321 to the first outer ring edge 421 to the connecting point of the seventh circular segment 4323 to the first outer ring edge 421 is set to be greater than the straight line distance from the connecting point of the first circular segment 4411 to the first inner ring edge 411 to the connecting point of the third circular segment 4413 to the first inner ring edge 411, which can strengthen the constraint and the connecting strength of the outer ring body 420, thereby improving the reliability of the transmission sheet 400.

[0122] In some embodiments, the ratio of the straight line distance from the connecting point of the fifth circular segment 4321 to the first outer ring edge 421 to the connecting point of the seventh circular segment 4323 to the first outer ring edge 421 to the width of the straight strip extension 433 is between 3.17 and 3.88.

[0123] The width of the connecting position of the first outer connecting portion 432 to the first outer ring edge 421 is set to correspond to the width of the straight strip extension 433, which can more accurately adjust the connecting strength of the connecting position of the first outer connecting portion 432 to the first outer ring edge 421.

[0124] Specifically, if the ratio of the straight-line distance between the connection point of the fifth circular arc segment 4321 and the first outer ring edge 421 to the connection point of the seventh circular arc segment 4323 and the first outer ring edge 421 to the width of the straight strip extension 433 is less than 3.17, the connection between the first outer connecting portion 432 and the first outer ring edge 421 will be weak, and the first outer connecting portion 432 will be prone to breakage when it is elastically deformed. If the ratio of the straight-line distance to the width of the straight strip extension 433 is greater than 3.88, the connection between the first outer connecting portion 432 and the first outer ring edge 421 will be too wide, and the first outer connecting portion 432 will excessively limit the movement of the inner ring body 410, thereby reducing the vibration sensitivity of the vibration transmission sheet 400, reducing the sensitivity of the transduction device 11, and affecting the bone conduction effect of the bone conduction earphone 1. Therefore, the ratio of the straight-line distance H2 to the width of the straight strip extension 433 is set to be between 3.17 and 3.88, which can ensure the sensitivity of the vibration transmission sheet 400 while improving the stiffness of the vibration transmission sheet 400 in the radial direction.

[0125] For example, the ratio of the straight-line distance between the connection point of the fifth circular arc segment 4321 and the first outer ring edge 421 to the connection point of the seventh circular arc segment 4323 and the first outer ring edge 421 to the width of the straight strip extension 433 can be 3.246, 3.52, or 3.751, etc.

[0126] In some embodiments, the first inner connecting portion 431 and the second outer connecting portion 442 can be set according to the shape of the first outer connecting portion 432 and the second inner connecting portion 441, so that the two ends of the first connecting rod 430 and the second connecting rod 440 each have similar settings, thereby reducing the stress difference when the first connecting rod 430 and the second connecting rod 440 are elastically deformed, dispersing stress, and thereby reducing the probability of fracture of the vibration transmission sheet 400, improving the reliability and service life of the vibration transmission sheet 400.

[0127] Based on the structural arrangement of the vibration transmission sheet 400 described above, the vibration transmission sheet 400 can be subjected to single-direction load fatigue simulation, and the distribution of stress and fatigue failure cycle number of the vibration transmission sheet 400 under the load in each direction can be studied.

[0128] In some embodiments, the interval direction of the two first straight segments 4111 can be defined as the width direction of the transmission sheet 400 (i.e. the direction indicated by the X arrow in FIG. 6), the interval direction of the two first curved segments 4112 can be defined as the length direction of the transmission sheet 400 (i.e. the direction indicated by the Y arrow in FIG. 6), and the axial direction of the transmission sheet 400 can be positioned as the thickness direction of the transmission sheet 400, wherein the thickness direction of the transmission sheet 400 is perpendicular to the width direction and the length direction. Therefore, the load received by the transmission sheet 400 during operation can be divided into the load along the width direction, the load along the length direction, the axial load (i.e. the load along the thickness direction of the transmission sheet 400), and the overturning load (i.e. the load for overturning the transmission sheet 400 around the width direction).

[0129] FIG. 8 is a stress distribution diagram of the transmission sheet 400 under the load along the length direction. As shown in FIG. 8, when the transmission sheet 400 receives the unidirectional load along the length direction, the elastic deformation of the two second links 440 is relatively large, and the stress is concentrated on the two second links 440, and is dispersed on the second inner connecting portion 441, the second outer connecting portion 442, and the curved extension portion 443 of the second link 440, instead of being concentrated on a certain point.

[0130] Further, in a fatigue simulation test, the fatigue failure cycle number of the transmission sheet 400 is 1.28E8 during the process of receiving the alternating stress along the length direction. Therefore, the structure of the two second links 440 can reduce the stress concentration when the transmission sheet 400 receives the load along the length direction, improve the stiffness of the transmission sheet 400 along the length direction, and improve the service life of the transmission sheet 400.

[0131] FIG. 9 is a stress distribution diagram of the transmission sheet 400 under the load along the width direction. As shown in FIG. 9, when the transmission sheet 400 receives the unidirectional load along the width direction, the elastic deformation of the two first links 430 and the two second links 440 is relatively large, and the stress is concentrated on the two first links 430 and the two second links 440, instead of being concentrated on a certain point. Further, in a fatigue simulation test, the fatigue failure cycle number of the transmission sheet 400 is 9.49E11 during the process of receiving the alternating stress along the width direction.

[0132] Therefore, when the transmission sheet 400 receives the load along the width direction, each part of the two first links 430 and the two second links 440 can share the stress, reduce the stress concentration, improve the stiffness of the transmission sheet 400 along the width direction, and improve the service life of the transmission sheet 400.

[0133] Fig. 10 and Fig. 11 are schematic diagrams of stress distribution of the transmission sheet 400 under axial load along the axial direction. As shown in Fig. 10 and Fig. 11, when the transmission sheet 400 is under axial load (i.e. load in the direction perpendicular to the plane where the transmission sheet 400 lies), the two first links 430 and the two second links 440 are elastically deformed, and the stress is distributed in various parts of the two first links 430 and the two second links 440 instead of being concentrated in a certain place. Further, in a fatigue simulation test, the fatigue failure cycle number of the transmission sheet 400 is 4.04E4 during the process that the transmission sheet 400 is under alternating stress along the axial direction.

[0134] When the bracket 200 provided with the voice coil 100 moves relative to the magnetic circuit system 300 during normal operation of the bone conduction earphone 1, the bracket 200 provided with the voice coil 100 drives the inner ring body 410 to move, and the magnetic circuit system 300 drives the outer ring body 420 to move, at which time the load on the transmission sheet 400 is axial load. Therefore, as shown in Fig. 10 and Fig. 11, the stress of the transmission sheet 400 can be distributed in various parts of the two first links 430 and the two second links 440 during normal operation of the bone conduction earphone 1, thereby improving the stiffness of the transmission sheet 400 in the radial direction and improving the reliability and service life of the transmission sheet 400.

[0135] Since the bracket 200 is suspended in the middle of the magnetic circuit system 300 through the inner ring body 410, and the length of the transmission sheet 400 is greater than the width, the transmission sheet 400 is prone to be subjected to a rollover load of rolling around the width direction during the process of collision or transportation. As shown in Fig. 12, Fig. 12 is a schematic diagram of stress distribution of the transmission sheet 400 under the rollover load of rolling around the width direction. When the transmission sheet 400 is under the rollover load of rolling around the width direction, the two first links 430 and the two second links 440 are elastically deformed, and the stress of the two first links 430 and the two second links 440 is uniformly distributed in various parts.

[0136] Further, in a fatigue simulation test that the transmission sheet 400 is under the rollover load of rolling around the width direction, the fatigue failure cycle number of the transmission sheet 400 is 5.99E11. Therefore, when the transmission sheet 400 is under the rollover load, the two first links 430 and the two second links 440 of the transmission sheet 400 can also uniformly bear stress, thereby improving the service life of the transmission sheet 400.

[0137] As can be seen from the above description, the structure of the transmission vibration sheet 400 can effectively disperse stress, reduce stress concentration and the likelihood of fracture, and improve the rigidity of the transmission vibration sheet 400 in the radial and axial directions, thereby improving the reliability and service life of the transmission vibration sheet 400.

[0138] In some embodiments, as shown in FIG. 7, the outer ring body 420 has a first outer ring edge 421 arranged adjacent to the inner ring body 410 and a second outer ring edge 422 arranged away from the inner ring body 410. The second outer ring edge 422 can be provided with a positioning protrusion 4221 protruding outwardly of the transmission vibration sheet 400. In other words, the positioning protrusion 4221 is arranged on the side of the second outer ring edge 422 facing away from the inner ring body 410.

[0139] Specifically, the arrangement of the positioning protrusion 4221 on the second outer ring edge 422 and the protrusion of the positioning protrusion 4221 outwardly of the transmission vibration sheet 400 can enable the transmission vibration sheet 400 to be positioned by the positioning protrusion 4221 in a jig used for assembling the transducing device 11 when the transducing device 11 is installed, thereby facilitating the sequential installation of other components such as the support 200 and the magnetic circuit system 300 on the transmission vibration sheet 400. During the installation process, the transmission vibration sheet 400 needs to be positioned on the jig before being further connected with other components of the loudspeaker assembly 10. The arrangement of the positioning protrusion 4221 can improve the positioning accuracy, so as to facilitate the more accurate positioning of the transmission vibration sheet 400 in the jig and reduce the likelihood of the transmission vibration sheet 400 shaking in the jig, thereby improving the assembly efficiency and effect of the transducing device 11.

[0140] In some embodiments, as shown in FIG. 7, the second outer ring edge 422 can include two first sub-linear 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-linear segments 4222 and protruding outwardly of the transmission vibration sheet 400. Optionally, the two first sub-linear segments 4222 can correspond to the two second linear segments 4211 of the first outer ring edge 421, and the two first sub-curved segments 4223 can correspond to the two first curved segments 4112 of the first outer ring edge 421.

[0141] The positioning protrusion 4221 can be arranged on the first sub-linear segment 4222. The positioning protrusion 4221 can be arranged on the first sub-linear 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 that of arranging the positioning protrusion 4221 on the first sub-linear segment 4222. Moreover, 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.

[0142] Of course, in other embodiments, the positioning protrusion 4221 can also be arranged on the first sub-curved segment 4223, which is not limited in the present embodiment.

[0143] In some embodiments, as shown in FIG. 7, the first sub-linear segment 4222 can also be provided with a positioning slot 4224 recessed towards the inner ring body 410. The positioning slot 4224 and the positioning protrusion 4221 are staggered along the circumference of the second outer ring edge 422. When the transducer device 11 is observed along the axis of the transducer device 11, the positioning slot 4224 can expose part of the magnetic circuit system 300, so that part of the magnetic circuit system 300 is not covered by the transmission sheet 400. The axis of the transducer device 11 can be perpendicular to the radial direction of the support 200, or parallel to the vibration direction of the support 200.

[0144] Optionally, as shown in FIG. 4, the transducer device 11 can also include a clamp 500, which can clamp the exposed part of the magnetic circuit system 300 so that the magnetic circuit system 300 is not easy to scatter in vibration. The exposed part 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 staggered with the transmission sheet 400 through the positioning slot 4224, so the clamp 500 is also staggered with the positioning protrusion 4221.

[0145] In some embodiments, as shown in FIG. 7, the positioning protrusion 4221 can be located at the edge of the positioning slot 4224. When observed along the thickness direction of the transmission sheet 400, the side edge 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 one 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 position and add the positioning protrusion 4221, so as to reduce the processing difficulty of the transmission sheet 400.

[0146] Of course, in other embodiments, the positioning protrusion 4221 can be located at other positions of the first sub-straight line segment 4222, such as 1 cm or 0.5 cm away from the positioning slot 4224, and the like, which will not be specifically enumerated here.

[0147] In some embodiments, as shown in FIG. 7, the first straight line 4225 can be arranged perpendicularly to the first sub-straight line segment 4222. In this way, the formation of the positioning slot 4224 and the positioning protrusion 4221 can be facilitated, and the positioning slot 4224 can further limit the movement of the magnetic circuit system 300 by limiting the clamp 500, so that the magnetic circuit system 300 is not prone to misalignment.

[0148] In some embodiments, as shown in FIG. 7, the positioning protrusion 4221 can be arranged in a rectangular shape. Optionally, one side of the rectangular positioning protrusion 4221 is connected and fixed with the first outer ring edge 421, and the other three edges exceed the first outer ring edge 421, for cooperating with the jig for assembling the transducer device 11. The rectangular positioning protrusion 4221 facilitates molding and can improve positioning accuracy.

[0149] Of course, in other embodiments, the positioning protrusion 4221 can also be circular, conical, or other arrangements, which will not be specifically enumerated here.

[0150] In some embodiments, as shown in FIG. 7, the two sides of the positioning slot 4224 can be respectively provided with the positioning protrusion 4221. The arrangement of multiple positioning protrusions 4221 can further improve the positioning accuracy, and the positioning protrusion 4221 itself can be broken and damaged during the cooperation with the jig for positioning.

[0151] In some embodiments, as shown in FIG. 7, the positioning slot 4224 and the positioning protrusion 4221 are two groups, and are arranged on the two first sub-straight line segments 4222, respectively.

[0152] Optionally, the two groups of positioning slots 4224 and the two groups of positioning protrusions 4221 can be arranged in axial symmetry, so as to realize the cooperation with the jig for positioning on both sides of the spacing direction of the two first sub-straight line segments 4222, thereby further improving the positioning accuracy.

[0153] For example, as shown in FIG. 7, one group of positioning slots 4224 can have one positioning slot 4224, and one group of positioning protrusions 4221 can have two positioning protrusions 4221, which are respectively located on the two sides of the positioning slot 4224, and the side edge of the two positioning protrusions 4221 close to the positioning slot 4224 naturally transitions with the two slot walls of the positioning slot 4224 and is located on the same straight line.

[0154] Optionally, each set of positioning slots 4224 and positioning protrusions 4221 is centrally arranged relative to the first sub-linear segment 4222 along the extension direction of the first sub-linear segment 4222. In this way, the central arrangement of the positioning slots 4224 and the positioning protrusions 4221 on the first sub-linear segment 4222 not only facilitates the positioning of the positioning slots 4224 and the positioning protrusions 4221, but also enables the transmission sheet 400 to be balanced when the transducer device 11 is assembled, so that the length of the first sub-linear segment 4222 can be reduced, and thus the size of the transmission sheet 400 can be reduced.

[0155] In some embodiments, the protruding length of the positioning protrusions 4221 relative to the second outer ring edge 422 can be between 0.315 mm and 0.385 mm, and the width relative to the second outer ring edge 422 can be between 0.378 mm and 0.462 mm. Wherein, the protruding length of the positioning protrusions 4221 relative to the second outer ring edge 422 can be shown as length K1 in FIG. 7, and the width of the positioning protrusions 4221 relative to the second outer ring edge 422 can be shown as length K2 in FIG. 7.

[0156] Specifically, if the protruding length of the positioning protrusions 4221 relative to the second outer ring edge 422 is less than 0.315 mm, the positioning protrusions 4221 are not easy to be positioned with the jig, and the positioning accuracy is too low. If the protruding length of the positioning protrusions 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, and when the transducer device 11 is assembled in the speaker assembly 10, more space needs to be reserved to accommodate the longer positioning protrusions 4221, thereby affecting the size of the earphone. Therefore, by setting the protruding length of the positioning protrusions 4221 relative to the second outer ring edge 422 to be between 0.315 mm and 0.385 mm, the positioning accuracy can be improved while the transmission sheet 400 retains a relatively narrow size in the direction between the two first sub-linear segments 4222.

[0157] Similarly, if the width of the positioning protrusions 4221 relative to the second outer ring edge 422 is less than 0.378 mm, the positioning protrusions 4221 are not easy to be positioned with the jig, and the positioning accuracy is too low. If the width of the positioning protrusions 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-linear segment 4222. Therefore, by setting the width of the positioning protrusions 4221 relative to the second outer ring edge 422 to be between 0.378 mm and 0.462 mm, the positioning accuracy can be improved while the transmission sheet 400 retains a relatively narrow size in the extension direction of the first sub-linear segment 4222.

[0158] For example, the protruding length of the positioning bump 4221 relative to the second outer ring edge 422 can be set to 0.325 mm, 0.35 mm, or 0.375 mm, and the width relative to the second outer ring edge 422 can be set to 0.395 mm, 0.42 mm, or 0.457 mm.

[0159] In summary, the first connecting rod 430 and the second connecting rod 440 are arranged to connect the inner ring body 410 and the outer ring body 420, one end of the first connecting rod 430 and the second connecting rod 440 is connected to the inner ring body 410, and the other end is connected to the outer ring body 420. The first connecting rod 430 is arranged 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 433 corresponding to the straight gap 401 and the straight shape of the inner ring body 410 and the outer ring body 420. The second connecting rod 440 is arranged in the curved gap 402 between the inner ring body 410 and the outer ring body 420, and the second connecting rod 440 is provided with a curved extension 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 cooperation 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 transmission sheet 400 and prolonging the service life of the transmission sheet 400.

[0160] The above only describes some embodiments of the present application, and does not limit the protection scope of the present application. Any equivalent device or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A vibration transducer, characterized in that, The vibration transducer 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 connecting the inner ring body and the outer ring body; The inner ring body has a first inner ring edge adjacent to the outer ring body. The first inner ring edge includes two first straight segments arranged side by side and back to side, and two first curved segments that connect the adjacent ends of the two first straight segments and protrude toward the outside of the vibration transducer. The outer ring body has a first outer ring edge adjacent to the inner ring body. The first outer ring edge includes two second straight segments located outside the two first straight segments and two second curved segments located outside the two first curved segments, so as to form a straight gap between adjacent first straight segments and second straight segments, and a curved gap between adjacent first curved segments and second curved segments. The first connecting rod includes a first inner connecting part connected to the edge of the first inner ring, a first outer connecting part connected to the edge of the first outer ring, and a straight extension part connected between the first inner connecting part and the first outer connecting part and located within the straight bar 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 within the curved gap.

2. The vibration transducer according to claim 1, characterized in that, The number of the first link and the number of the second link are two, and the two first links and the two second links are respectively rotationally symmetrical about 180 degrees with respect to the centroid or centroid of the inner ring.

3. The vibration transducer according to claim 1, characterized in that, The first inner connecting portion is disposed adjacent to the second outer connecting portion, and the first outer connecting portion is disposed adjacent to the second inner connecting portion.

4. The vibration transducer 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 a circular arc shape 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.

5. The vibration transducer according to claim 1, characterized in that, The inner edge of the curved extension is arc-shaped. The inner edge of the second inner connecting portion includes a first arc segment connected to the edge of the first inner ring and a second arc segment connecting the first arc segment and the inner edge of the curved extension. The ratio of the diameter of the first arc segment to the diameter of the inner edge of the curved extension is between 0.02 and 0.03, and the ratio of the diameter of the second arc segment to the diameter of the inner edge of the curved extension is between 0.11 and 0.

14. The first arc segment and the second arc segment are concave arcs.

6. The vibration transducer according to claim 5, characterized in that, 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. The ratio of the diameter of the third arc segment to the diameter of the inner edge of the curved extension and the ratio of the diameter of the fourth arc segment to the diameter of the inner edge of the curved extension 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 transducer according to claim 6, characterized in that, The diameter of the fourth arc segment is the same as the diameter of the third arc segment.

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

25.

9. The vibration transducer according to claim 6, characterized in that, The second inner connecting portion is disposed adjacent to the first outer connecting portion. 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, and 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. The fifth arc segment and the sixth arc segment are concave arcs.

10. The vibration transducer according to claim 9, characterized in that, The diameter of the fifth arc segment is the same as the diameter of the first arc segment, and the diameter of the sixth arc segment is the same as the diameter of the second arc segment.

11. The vibration transducer according to claim 9, characterized in that, 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 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 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 transducer according to claim 11, characterized in that, The included angle is between 11° and 15°.

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

54.

14. The vibration transducer according to claim 13, characterized in that, The width of the curved extension is between the width of the straight extension and the width of the inner ring.

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

2.

16. The vibration transducer according to claim 15, characterized in that, The diameters of the third, fourth, seventh, and eighth circular arc segments are the same.

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

18. The vibration transducer 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 edge of the first outer ring to the connection point of the seventh arc segment and the edge of the first outer ring to the width of the straight extension is between 3.17 and 3.

88.

19. The vibration transducer according to claim 1, characterized in that, The first connecting rod has a smooth transition connection with the edge of the first inner ring and the edge of the first outer ring; the second connecting rod also has a smooth transition connection with the edge of the first inner ring and the edge of the first outer ring.

20. The vibration transducer according to claim 1, characterized in that, The outer ring body has a first outer ring edge disposed adjacent to the inner ring body and a second outer ring edge disposed away from the inner ring body; A positioning protrusion is provided on the edge of the second outer ring, and the positioning protrusion protrudes outward toward the vibrating plate.

21. The vibration transducer according to claim 20, characterized in that, The second outer ring edge includes two first sub-straight segments arranged side by side and back to side, and two first sub-curved segments that connect the adjacent ends of the two first sub-straight segments and protrude toward the outside of the vibration transducer; the positioning protrusion is disposed on the first sub-straight segments.

22. The vibration transducer according to claim 21, characterized in that, The first sub-straight segment is also provided with a positioning slot that is recessed toward the inner ring body; the positioning slot and the positioning protrusion are offset from each other circumferentially along the edge of the second outer ring.

23. The vibration transducer according to claim 22, characterized in that, The positioning protrusion is located at the edge of the positioning slot. When viewed along the direction perpendicular to the main surface of the outer ring body, the edge of the positioning protrusion near the positioning slot is aligned with the slot wall and forms a first straight line.

24. The vibration transducer according to claim 23, characterized in that, The first straight line is set perpendicular to the first sub-straight line segment.

25. The vibration transducer according to claim 23, characterized in that, The positioning bump is rectangular in shape.

26. The vibration transducer according to claim 24, characterized in that, The positioning protrusions are respectively provided on both sides of the positioning slot.

27. The vibration transducer according to claim 26, characterized in that, The number of positioning slots and positioning protrusions is two sets, and they are respectively set on the two first sub-straight segments.

28. The vibration transducer according to claim 26, characterized in that, Each set of positioning slots and positioning protrusions is centered relative to the first sub-straight segment along the extension direction of the first sub-straight segment.

29. The vibration transducer according to any one of claims 20-28, characterized in that, The protrusion length of the positioning protrusion relative to the edge of the second outer ring is between 0.315mm and 0.385mm, and the width relative to the edge of the second outer ring is between 0.378mm and 0.462mm.

30. A loudspeaker assembly, characterized in that, The loudspeaker assembly includes a transducer, which includes a voice coil, a bracket, a magnetic circuit system, and a transducer as described in any one of claims 1-29. The inner ring of the transducer is connected to the bracket, and the outer ring is connected to the magnetic circuit system to elastically suspend the magnetic circuit system around the bracket. The voice coil is disposed on the bracket.

31. A bone conduction headphone, characterized in that, The bone conduction headphones include the vibration plate as described in any one of claims 1-29.

Images