Vibration piece and bone conduction speaker using the same

Abstract

The present invention discloses a vibration transmission plate and a bone conduction speaker using the vibration transmission plate, relating to the field of bone conduction sound technology. The vibration transmission plate includes an internal structure and an external structure; a support rod connecting the internal and external structures; the support rod is provided with a first contact point on the internal structure, and a second contact point on the external structure; with the center of the internal structure as a reference point, the reference point and the first contact point form a first reference line, and the reference point and the second contact point form a second reference line; the angle formed by rotating from the first reference line around the reference point to the second reference line is the support rod angle, and the range of the support rod angle is 0 degrees to 360 degrees. The present invention further improves the structure of the vibration transmission plate to improve the sound quality of the bone conduction speaker and its reliability during use.

Description

Technical Field

[0001] The present invention relates to a vibration transmission piece and a bone conduction loudspeaker using the vibration transmission piece, and in particular to an improvement in the structure of the vibration transmission piece of the bone conduction loudspeaker. Background Art

[0002] Generally speaking, the sound that humans hear can be categorized into two types: air conduction and bone conduction. Air conduction involves the transmission of vibrations from air through the external auditory canal to the eardrum. The vibrations generated by the eardrum activate the auditory nerve, allowing us to perceive sound vibrations. Bone conduction involves the transmission of sound through vibrations in the skin and bones, bypassing the external auditory canal and eardrum, and directly to the inner ear, activating the auditory nerve. Headphones that utilize this principle are called bone conduction headphones, and their core component is the bone conduction vibration speaker.

[0003] The patent number "201110438083.9" granted in 2013, entitled "A bone conduction speaker and its composite vibration device", is the closest prior art to this patent. The entire text of the patent document is cited here for reference. Figure 1 As shown, the specification discloses a bone conduction speaker and its composite vibration device: the bone conduction speaker structure includes a vibration transmitting piece 1 and a vibration plate 2, wherein the vibration transmitting piece 1 is configured as a first circular body 111, and at least two first support rods 112 radiating toward the center in the inner ring 111; the vibration plate is configured as a second circular body 121, and at least two second support rods 122 radiating toward the center in the outer ring 121; the vibration transmitting piece 1 and the vibration plate 2 are fixed together; the inner ring 111 is fixed to a magnetic system, and the outer ring 121 is fixed with a voice coil 8 acted upon by the magnetic system.

[0004] However, the device has the following problems: the support rod is designed as a straight rod, the design deformation of the support rod is small, the elastic coefficient is large, and it is difficult for the vibration transmission plate to achieve a lower low frequency when working. Summary of the Invention

[0005] In view of the above problems, the object of the present invention is to provide a vibration transmission plate device for a bone conduction speaker, and to improve the sound quality of the bone conduction speaker by further improving the structure of the vibration transmission plate.

[0006] In order to achieve the above-mentioned object of the invention, the technical solution provided by the present invention is as follows:

[0007] A vibration transmission plate, characterized in that it includes an internal structure and an external structure; a support rod connecting the internal structure and the external structure; wherein the support rod is provided with a first contact point on the internal structure, and the support rod is provided with a second contact point on the external structure; taking the center of the internal structure as a reference point, the reference point and the first contact point form a first reference line, and the reference point and the second contact point form a second reference line; starting from the first reference line, the angle formed by rotating around the reference point to the second reference line is the support rod angle, and the range of the support rod angle is 0 degrees to 360 degrees.

[0008] Preferably, the support rod of the vibration transmission plate is a bent rod.

[0009] Preferably, the number of the support rods is greater than or equal to three.

[0010] Preferably, the support rod angle is greater than 60 degrees.

[0011] Preferably, the first contact point and the second contact point form a first straight line, the length of the first straight line is a first distance, the maximum vertical distance between the point on the support rod and the first straight line is a second distance, and the ratio of the second distance to the first distance is less than or equal to 1:1.7.

[0012] Preferably, the cross section of the support rod of the vibration transmission plate in a direction perpendicular to the plane of the vibration transmission plate is a curved surface.

[0013] Preferably, the curved surface of the vibration transmission plate support rod is wavy or sawtooth-shaped.

[0014] Preferably, the vibration transmission plate is made of metal material.

[0015] Preferably, the hollow area between the external structure and the internal structure accounts for greater than or equal to 30%.

[0016] The present invention also provides a bone conduction speaker, characterized by using any of the vibration transmission sheets described above.

[0017] Compared with the prior art, the beneficial effect of the present invention is that the support rod of the vibration transmission plate is a bent rod, which can effectively reduce the nonlinear distortion of the vibration transmission plate during operation and maintain the stability of the sound quality compared to a straight rod.

[0018] Some additional features of the present application may be described in the following description. Some additional features of the present application will be apparent to those skilled in the art from an inspection of the following description and accompanying drawings, or from a thorough understanding of the production or operation of the embodiments. The disclosed features may be realized and achieved through the practice or use of the methods, means, and combinations of various aspects of the specific embodiments described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly describes the drawings required for describing the embodiments. Obviously, the drawings described below represent only some embodiments of the present invention. Those skilled in the art can apply the present invention to other similar scenarios based on these drawings without inventive effort. Unless otherwise apparent from the context or otherwise noted, the same reference numerals in the figures represent the same structures and operations.

[0020] Figure 1 It is a structural diagram of a bone conduction speaker device;

[0021] Figure 2 The graph is provided according to an embodiment of the present invention, showing the relationship between the vibration force and the displacement in the vibration direction when the supporting rods are straight rods and bent rods respectively;

[0022] Figure 3 The graph is a curve showing changes in elastic coefficients of a straight-rod vibration transmitting piece and a bent-rod vibration transmitting piece under different vibration displacements according to an embodiment of the present invention;

[0023] Figure 4 2 is a structural diagram of a first bone conduction speaker vibration transmission piece provided according to an embodiment of the present invention;

[0024] Figure 5 2 is a structural diagram of a second bone conduction speaker vibration transmission piece provided according to an embodiment of the present invention;

[0025] Figure 6 2 is a structural diagram of a third bone conduction speaker vibration transmission piece provided according to an embodiment of the present invention;

[0026] Figure 7 is a schematic diagram of a definition of a support angle provided by an embodiment of the present invention;

[0027] Figure 8 This is a schematic structural diagram of the deformation and rotation of a support rod of a bone conduction speaker according to an embodiment of the present invention;

[0028] Figure 9 1 is a structural diagram of a bone conduction speaker vibration transmission piece according to an embodiment of the present invention, wherein the angles of the support rods are 100 degrees, 50 degrees, 25 degrees and 205 degrees, respectively;

[0029] Figure 10 This is a description provided according to an embodiment of the present invention. Figure 9 The rotation angle of the internal and external structures when the support rod angles are different;

[0030] Figure 11 This is a schematic diagram of a support rod flipping according to an embodiment of the present invention;

[0031] Figure 12 is a schematic diagram of a definition of a bending degree of a support rod provided in an embodiment of the present invention;

[0032] Figure 13 1 is a structural diagram of a vibration transmission plate according to an embodiment of the present invention when the bending degrees of the support rod are 1:3.3, 1:2.5 and 1:1.7 respectively;

[0033] Figure 14 According to an embodiment of the present invention, a Figure 13 The corresponding relationship between the flipping force and the flipping displacement under the vibration transmission plate;

[0034] Figure 15 This is a structural diagram of a bone conduction speaker vibration plate with an offset internal structure and an external structure according to an embodiment of the present invention;

[0035] Figure 16 This is a structural diagram of a bone conduction speaker vibration transmission piece provided according to an embodiment of the present invention;

[0036] Figure 17 is a curve showing the corresponding relationship between the deflection angle and the deflection force of a vibration transmission piece of a bone conduction speaker provided by an embodiment of the present invention;

[0037] Figure 18 This is a structural diagram of a bone conduction speaker vibration plate support rod provided according to an embodiment of the present invention;

[0038] Figure 19 2 is a structural diagram of a fourth bone conduction speaker vibration transmission piece provided according to an embodiment of the present invention;

[0039] Figure 20 2 is a structural diagram of a fifth bone conduction speaker vibration transmission piece provided according to an embodiment of the present invention;

[0040] Figure 21 2 is a structural diagram of a sixth bone conduction speaker vibration transmission piece provided according to an embodiment of the present invention;

[0041] Figure 22 2 is a structural diagram of a seventh bone conduction speaker vibration transmission piece provided according to an embodiment of the present invention;

[0042] Figure 23 2 is a structural diagram of an eighth bone conduction speaker vibration transmission piece provided according to an embodiment of the present invention;

[0043] Figure 24 2 is a structural diagram of a ninth bone conduction speaker vibration transmission piece provided according to an embodiment of the present invention;

[0044] Figure 25 2 is a structural diagram of a tenth bone conduction speaker vibration transmission piece provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0045] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings. Specific embodiment one:

[0047] Figure 2 The curves are provided according to an embodiment of the present invention, showing the relationship between the vibration force and the displacement in the vibration direction when the support rods are straight rods and bent rods respectively. Figure 2 It can be seen that when the support rod is a straight rod, as the intensity of vibration increases (increases displacement), the elastic coefficient (the ratio of force to displacement on the curve) exhibited by the straight rod vibration transducer is not linear, but will become larger and larger. For the curved rod vibration transducer, because the effective distance of the curved rod is greater than that of the straight rod under the same shape and area, the force and displacement of the curved rod during vibration basically show a nearly linear trend. Therefore, compared to the vibration transducer with a straight rod support rod, the technical advantage of using a curved rod vibration transducer is that it can effectively reduce the nonlinear distortion of the vibration transducer during operation, maintaining the stability of the sound quality.

[0048] Figure 3 Comparing the changes in the elastic coefficient of straight and bent-rod transducers under varying vibration displacements clearly shows that the elastic coefficient of the straight-rod transducer increases with intense vibration, while the elastic coefficient of the bent-rod transducer remains very flat. The elastic coefficient of the transducer decisively influences the sound quality of a vibration speaker. Therefore, the use of a bent-rod design significantly improves nonlinear distortion, resulting in more stable sound quality. Specific embodiment two:

[0050] like Figure 4 Figure 4 shows a first bone conduction speaker vibration plate structure according to an embodiment of the present invention. In some embodiments, the vibration plate is made of metal and has an annular structure, including an inner structure 410 (i.e., an inner ring), an outer structure 430 (i.e., an outer ring), and a support rod connecting the inner and outer rings. Figure 4 In some embodiments, the shape of the inner structure 410 and / or the outer structure 430 can be circular (e.g. Figure 4 As shown), triangle (as Figure 20 As shown), quadrilateral, pentagon, hexagon (as Figure 19 ), and any other similar geometric shapes (such as Figure 25 shown).

[0051] Figure 5 Indicates that the number of support rods is 4 (520-1, 520-2, 520-3, 520-4). Figure 6This indicates there are five rods (620-1, 620-2, 620-3, 620-4, 620-5). Compared to two or one rod, the advantage of three to five rods is greater stability and less likely to deflect during use, resulting in greater reliability. Deflection refers to an abnormal condition where the inner and outer ring planes are not parallel, but at an angle. This condition can cause abnormal vibration during operation, which is detrimental to the sound quality of the bone conduction speaker. Compared to a larger number of rods, fewer rods allow each rod to be longer due to the limited space between the inner and outer rings. Furthermore, the increased number of rods reduces the elasticity between the inner and outer rings for the same size transducer, preventing the transducer from achieving a lower resonant frequency, which can negatively impact the sound quality of the bone conduction speaker.

[0052] In some embodiments, the transducer is made of a metal material, including but not limited to steel (such as, but not limited to, stainless steel, carbon steel, etc.) and lightweight alloys (such as, but not limited to, aluminum alloy, beryllium copper, magnesium alloy, titanium alloy, etc.). Other single or composite materials that achieve similar performance can also be used. Composite materials include, but are not limited to, reinforcing materials such as glass fiber, carbon fiber, boron fiber, graphite fiber, graphene fiber, silicon carbide fiber, or aramid fiber. Specific embodiment three:

[0054] This embodiment is a further improvement on the basis of the second embodiment, and further optimizes the angle of the support rods in the first embodiment. Figure 7 The vibration transmission piece shown is considered as a ring structure, in which case the outer structure is the outer ring and the inner structure is the inner ring. Figure 7 As shown: the support rod 720-1 is provided with a first contact point on the internal structure 710, that is, the support rod 720-1 is located at position point A of the inner ring 710, and the support rod 720-1 is provided with a second contact point on the external structure 730, that is, the support rod 720-1 is located at position point B of the outer ring 730; the internal structure 710 has a reference point, that is, the center point O of the inner ring 710; the reference point O and the first contact point A form a first reference line OA; the reference point O and the second contact point B form a second reference line OB; starting from the first reference line OA, the angle θ formed by rotating around the reference point (for example, the center point O) to the second reference line OB is the support rod angle.

[0055] Preferably, the angle of the support rod is greater than 60 degrees, more preferably, the angle of the support rod is greater than 80 degrees, and even more preferably, the angle of the support rod is greater than 90 degrees. The angle of the support rod used in the present invention is 100 degrees. In some embodiments, the angle of the support rod can be greater than 180 degrees. When the vibration plate is working, the inner ring and the outer ring are separated to a certain extent along the axis of the inner and outer rings. At this time, a certain rotation will be generated between the inner ring and the outer ring to reduce the deformation of the support rod. The form of rotation is as follows: Figure 8 shown.

[0056] like Figure 9 The following describes the vibration transmission plate with support angles of θ1, θ2, θ3 and θ4, where θ1 is 100 degrees, θ2 is 50 degrees, θ3 is 25 degrees, and θ4 is 205 degrees.

[0057] Figure 10 is a description Figure 9 The rotation angles of the inner and outer rings at different strut angles show that, for the same axial separation distance between the inner and outer rings, the larger the strut angle, the smaller the rotation between the inner and outer rings. Therefore, increasing the strut angle can reduce the rotation of the vibration plate during operation, thereby improving the reliability of the vibration system. Specific embodiment four:

[0059] This embodiment is a further improvement on the third embodiment, mainly focusing on further limiting the bending degree of the support rod. When the support rod is subjected to a force perpendicular to the plane of the support rod instead of the two ends of the support rod, the support rod itself will flip over, such as Figure 11 As shown. After flipping, the vibration transmission plate is likely to interfere with the upper and lower structures, and the performance will change significantly. The flipping degree of the support rod is greatly affected by the bending degree of the support rod. The greater the bending degree of the support rod, the easier it is to flip. In this specification, the definition of the bending degree of the support rod is as follows Figure 12 As shown: a line AB is formed between the connection point A of the support rod 1220-1 at the inner ring 1210 and the connection point B of the support rod 1220-1 at the outer ring 1230. The length of the line AB is L. Find a point C on the support rod 1220-1 so that the vertical distance between this point and the line AB is the largest. This vertical distance is recorded as D. The degree of bending is defined as the ratio of the lengths D:L. The larger the ratio D:L, the greater the degree of bending of the support rod.

[0060] Figure 13 The vibration sensors are described when the bending degrees of the strut are 1:3.3, 1:2.5 and 1:1.7. Figure 14 Described Figure 13 The corresponding relationship between the flipping force and the flipping displacement under the vibration transmission plate. It can be seen from the figure that for the same flipping force, when the bending degree of the support rod is larger, the flipping displacement is larger. Specific embodiment five:

[0062] This embodiment is a further improvement on the fourth embodiment. When the force on the inner ring or outer ring of the vibration transmission plate is not along the axis direction, or the force on the ring is uneven, the vibration transmission plate will deflect. For example, when the force on the outer ring of the vibration transmission plate is uniform, but the force on the inner ring is uneven, the deflection may occur as follows: Figure 15 As shown, the outer ring plane of the vibration transmission plate is not parallel to the inner ring plane. In this case, the deformation of the support rod is not only along the axial direction of the inner and outer rings, but also produces a torsional moment T of the torsional rod. The relationship between the torsional angle φ under the moment and the length l, width b and thickness h of the support rod is: Where G is the shear modulus of the material. The coefficient β is related to the ratio b / h between the width and thickness of the support rod. Typical values ​​of β are shown in the following table:

[0063] b / h 1 1.2 1.5 1.75 2 2.5 3 10 ∞ β 0.141 0.166 0.196 0.214 0.229 0.249 0.263 0.313 0.333

[0064] Compared to the deflection equation of the support , where s is the axial offset distance between the inner and outer rings of the vibration transmitter, F is the force required to cause the inner and outer rings of the vibration transmitter to offset axially, l is the length of the support rod, E is the elastic modulus of the support rod, b is the width of the support rod (corresponding to the plane of the inner and outer rings), and h is the thickness of the support rod (corresponding to the direction perpendicular to the plane of the inner and outer rings). The two can be unified and simplified as To make the struts less resistant to twisting while maintaining the same strut material and elasticity (s / F remains constant), a feasible approach is to increase the strut length l and the coefficient β. As can be seen from the table, as the value of b / h increases, the coefficient β increases, and the torsion angle at the same moment T decreases, making the struts less resistant to twisting. Therefore, by increasing the strut width b while reducing the strut thickness h, the struts can be made less resistant to twisting, thereby reducing strut deflection and improving the device reliability of the vibration sensor.

[0065] In practice, because the transducer support rods are not ideal, there are some differences from theoretical calculations. The deflection angle is defined as the angle between the planes of the outer and inner rings when the inner and outer rings of the transducer deflect. The deflection force is a force applied axially along the inner and outer ring planes at the inner ring. The deflection force consists of two forces, one positive and one negative, applied along the axis, applied at two locations on the inner ring with the same diameter.

[0066] Figure 16 The corresponding relationship between the deflection angle and the deflection force of the vibration transmitter with a support width of 1mm and 0.5mm is described as follows Figure 17 As shown in the figure, it can be seen that when the width of the support rod decreases, the deflection angle increases significantly under the same deflection force.

[0067] Regarding the length, width and curvature of the support rod and the size of the inner ring, this embodiment further defines the length and width of the rod. In the actual product, the outer ring diameter is 17 mm, the inner ring diameter is 8 mm, the support rod width is 1 mm, and the length is 13 mm. Specific embodiment six:

[0069] This embodiment is a further improvement on the first to fifth embodiments. When the inner and outer ring diameters of the vibration plate are determined, the space between the inner and outer rings is also determined. In order to further increase the length of the support rod and improve the elasticity of the support rod of the vibration plate to improve the resonant frequency of the vibration plate and improve the reliability of the bone conduction vibration speaker during operation, the support rod of the vibration plate is designed to be a curved surface in the direction perpendicular to the plane of the vibration plate, wherein Figure 18 There are two typical curved surface designs, where the cross section of the support rod perpendicular to the plane of the vibration plate is wavy or sawtooth. Figure 18 In (a), the plane 1803 where the inner and outer rings are located is between the highest point 1801 and the lowest point 1802 of the surface. Figure 18 In (b), the highest point 1801 and the lowest point 1802 of the curved surface are located on one side of the plane 1803 where the inner ring and the outer ring are located. Figure 18 In (b), the highest point 1801 (or the lowest point 1802) of the surface is on the plane 1803 where the inner ring and the outer ring are located. Specific embodiment seven:

[0071] This embodiment is an improvement on the second embodiment. The outer ring and the inner ring of the vibration transmission plate are connected by a support rod. A certain hollow area needs to be ensured between the inner and outer ring vibration transmission plates. The hollow area is located on the two rings. The hollow area can be the space between the inner and outer rings on the vibration transmission plate plane that is not occupied by the support rod. For example, Figure 4 As shown, the hollow area 440-1 is surrounded by support rods 420-1, 420-2, inner ring 410, and outer ring 430; or the hollow area 440-2 is surrounded by support rods 420-1, 420-3, inner ring 410, and outer ring 430; or the hollow area 440-3 is surrounded by support rods 420-2, 420-3, inner ring 410, and outer ring 430. The purpose of the hollow area is to connect the air above and below the vibration plate, thereby reducing sound leakage from the bone conduction speaker. When the hollow area is larger, the vibration plate is better connected to the air above and below, and the bone conduction speaker has less sound leakage. At the same time, when the hollow area on the vibration plate is larger, the area of ​​the vibration plate itself vibrating is smaller, resulting in less sound leakage. Preferably, the proportion of the hollow area (i.e., the ratio of the area of ​​the hollow area to the area of ​​the area between the inner ring and the outer ring) is greater than 30%, further preferably, the proportion of the hollow area is greater than 40%, and even further preferably, the proportion of the hollow area is greater than 50%. Specific embodiment eight:

[0073] This embodiment is an improvement on the second embodiment, wherein the metal flat plate used to make the vibration transmission plate can be a plane with uniform thickness, or a plane with non-uniform thickness along the radial direction. The rod of the vibration transmission plate can be made thicker near the internal structure and thinner near the external structure. The internal and external structures of the vibration transmission plate can also be made non-circular, such as Figure 19 、 20 As shown, Figure 19 The external structure 1930 of the vibration transmission piece is a hexagon. Figure 20 The internal structure 2010 of the vibration transmission plate is a triangle. The support rods can also be of non-uniform width, such as Figure 21 As shown, the support rod 2120 may have a structure with uneven thickness along the rod direction. Specific embodiment nine:

[0075] This embodiment is an improvement on the second embodiment. The connection between the inner ring of the vibration transmission plate and the inner ring object, and the connection between the outer ring and the outer ring object can be various ways, including bonding, welding, riveting, etc.

[0076] The transducer can be attached to an object using glue. This method takes up less space and can connect a variety of materials. The choice of glue also changes the transducer's elasticity. Compared to using harder glue, using a softer glue allows for greater elasticity and allows for more low-frequency sound.

[0077] When the object is a plastic part, the vibration transmission piece and the object can be connected by heat riveting. Figure 22 The vibration transmitter shown has holes 2231 on its outer ring 2230, with plastic studs positioned in the corresponding locations. After the two are assembled and positioned, the protruding studs on the surface of the vibration transmitter are melted by controlled heat and then reshaped by a metal rivet head. This method eliminates the need for additional components, reducing processing costs and improving efficiency. Specific embodiment ten:

[0079] The inner and outer rings of the vibration transmission plate can have different structures to locate objects on the inner and outer rings. The structure on the inner ring of the vibration transmission plate can be a planar structure or it can be non-planar. The structure in the plane can be used for positioning with harder materials, such as positioning columns on the inner and outer rings and positioning holes on the vibration transmission plate. For softer materials of the inner and outer rings, the non-planar structure can achieve better positioning. Figure 23The vibration transmission plate structure shown here features an additional ridge 2340 on the outer ring 2330 of the plate to facilitate assembly of objects on the outer ring. When the outer ring is connected to a soft object such as silicone, this ridge can be used to position it for proper assembly. This ridge can be fabricated by making a bent metal piece spot-welded to the vibration transmission plate, or other methods are possible. Specific embodiment eleven:

[0081] The inner and outer rings of the vibration transmission plate are connected by a rod, and the inner and outer rings are the same device. On this basis, other materials or structures can be added between the inner and outer rings to change the performance of the vibration transmission plate.

[0082] like Figure 24 As shown, a waterproof film can be added to the vibration transmission plate for waterproofing. The inner ring and the outer ring of the vibration transmission plate are connected by rods. There are gaps between the rods, and water can pass through the vibration transmission plate structure from one side to the other. Adding a layer of waterproof film to the vibration transmission plate can, on the one hand, prevent water from passing through the vibration transmission plate from one side to the other, and on the other hand, the film is softer and has less effect on the elasticity of the vibration transmission plate. The waterproof film can be breathable, and water cannot pass through the waterproof film, but gas can pass through, thereby not affecting the acoustic performance of the vibration speaker. The waterproof film can be connected to the vibration transmission plate by bonding. In particular, double-sided tape can be used for bonding. Specific embodiment 12:

[0084] like Figure 25 The vibration transmission piece shown may include an internal structure 2510 and an external structure 2530, as well as three support rods (2520-1, 2520-2 and 2520-3). In some embodiments, the number of support rods may not be limited to 3, and may be greater than or equal to 3. The center point of the internal structure 2510 is point D, the contact point between the support rod 2520-1 and the internal structure 2510 is point E, the contact point between the support rod 2520-1 and the external structure 2530 is point F, and the angle θ4 formed by the straight line DE and the straight line DF is the support rod angle. The shape of the external structure 2530 can be adjusted according to the specific situation, and can be circular (such as Figure 4 As shown), quadrilateral, pentagon, hexagon (as Figure 19 As shown), triangle (as Figure 20 as shown), or as Figure 25 An irregular arbitrary geometric shape is shown.

[0085] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A vibration transmission sheet, characterized in that: include: internal and external structures; a support rod connecting the inner structure and the outer structure; wherein the support rod is provided with a first contact point on the inner structure, and the support rod is provided with a second contact point on the outer structure; Taking the center of the internal structure as a reference point, the reference point and the first contact point form a first reference line, and the reference point and the second contact point form a second reference line; The angle formed by rotating from the first reference line around the reference point to the second reference line is the support rod angle, and the support rod angle is greater than 60 degrees, 80 degrees, 90 degrees, 100 degrees, 180 degrees, or 205 degrees, and less than 360 degrees.

2. The vibration transmitting piece according to claim 1, wherein: The support rod of the vibration transmission plate is a bent rod.

3. The vibration transmitting piece according to claim 1, wherein: The number of the support rods is greater than or equal to three.

4. The vibration transmitting piece according to claim 1, wherein: The ratio of the width of the support rod to the thickness of the support rod is in the range of 3-10.

5. The vibration transmitting piece according to claim 1, wherein: The first contact point and the second contact point form a first straight line, the length of the first straight line is a first distance, the maximum vertical distance between the point on the support rod and the first straight line is a second distance, and the ratio of the second distance to the first distance is less than or equal to 1:1.7, or less than or equal to 1:2.5, or less than or equal to 1:3.

3.

6. The vibration transmitting piece according to claim 1, wherein: When the included angle of the support rod is greater than 80 degrees, 90 degrees, 100 degrees, 180 degrees or 205 degrees, and less than 360 degrees, the cross section of the support rod of the vibration transmission plate in the direction perpendicular to the plane of the vibration transmission plate is a curved surface.

7. The vibration transmitting piece according to claim 6, wherein: The curved surface of the vibration transmission plate support rod is wavy or sawtooth.

8. The vibration transmitting piece according to claim 1, wherein: The connection parts between the support rod, the internal structure and the external structure have an arc-shaped transition.

9. The vibration transmitting piece according to claim 1, wherein: The hollow area between the external structure and the internal structure accounts for greater than or equal to 30%.

10. The vibration transmitting piece according to claim 1, wherein: The shape of the internal structure and / or the external structure is circular, triangular, quadrilateral, pentagonal or hexagonal.

11. The vibration transmitting piece according to claim 1, wherein: The width of the struts is non-uniform; and / or the struts are thicker near the inner structure and thinner near the outer structure.

12. The vibration transmitting piece according to claim 1, wherein: The vibration transmission piece is provided with a positioning hole.

13. The vibration transmitting piece according to claim 11, characterized in that: The plane where the internal structure and the external structure are located is located between the highest point and the lowest point of the curved surface.

14. The vibration transmission sheet according to any one of claims 4, 8, 10-13, characterized in that: The cross section of the support rod of the vibration transmission piece in a direction perpendicular to the plane of the vibration transmission piece is a curved surface.

15. The vibration transmitting piece according to claim 14, wherein: The curved surface of the vibration transmission plate support rod is wavy or sawtooth.

16. The vibration transmitting piece according to claim 5, wherein: When the ratio of the second distance to the first distance is less than or equal to 1:2.5, or less than or equal to 1:3.3, the cross section of the support rod of the vibration transmission plate in a direction perpendicular to the plane of the vibration transmission plate is a curved surface.

17. The vibration transmitting piece according to claim 16, wherein: The curved surface of the vibration transmission plate support rod is wavy or sawtooth.

18. A bone conduction speaker, characterized in that: Use the vibration transmission sheet as described in any one of claims 1-17.

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