CN117098043A

CN117098043A - Bone conduction loudspeaker

Info

Publication number: CN117098043A
Application number: CN202311066005.XA
Authority: CN
Inventors: 郑金波; 廖风云; 齐心
Original assignee: Shenzhen Voxtech Co Ltd
Current assignee: Shenzhen Voxtech Co Ltd
Priority date: 2017-09-24
Filing date: 2017-09-24
Publication date: 2023-11-21
Also published as: CN107426647A

Abstract

The application discloses a vibration transmission sheet and a bone conduction loudspeaker using the vibration transmission sheet, and relates to the technical field of bone conduction loudspeaker; a strut connecting the inner structure and the outer structure; wherein the strut provides a first contact point on the inner structure and a second contact point on the outer structure; taking the center of the internal structure as a reference point, wherein 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; and starting from the first reference line, forming an angle from rotating around a reference point to the second reference line into a supporting rod included angle, wherein the range of the supporting rod included angle is 0-360 degrees. The application improves the sound quality of the bone conduction speaker and the reliability in the use process by further improving the structure of the vibration absorbing sheet.

Description

Bone conduction loudspeaker

The application relates to a Chinese patent application with the application number of 201710870905.8 and the name of vibration transmission sheet and bone conduction loudspeaker using the vibration transmission sheet, which is divided into 24 days of 2017 and 09.

Technical Field

The application relates to a vibration-transmitting sheet and a bone conduction loudspeaker using the same, in particular to an improvement of a vibration-transmitting sheet structure of a bone conduction loudspeaker.

Background

In general, the human audible sound can be divided into two types: air conduction and bone conduction. Air conduction is the transmission of vibrations through the external auditory canal to the eardrum, where the vibrations formed by the eardrum drive the person's auditory nerve, thereby perceiving the vibrations of the sound. The principle of bone conduction is that sound is transmitted directly to the inner ear without passing through the external auditory meatus and eardrum through vibration of skin tissue and bone, driving human auditory nerve. Headphones utilizing the principle of bone conduction are called bone conduction headphones, and the core component of the bone conduction headphones is a bone conduction vibration speaker.

One patent number issued in 2013, entitled "201110438083.9," entitled "bone conduction speaker and its composite vibration device," is the closest prior art to this patent and is incorporated herein by reference in its entirety. As shown in fig. 1, the specification discloses a bone conduction speaker and a composite vibration device thereof: the bone conduction speaker structure comprises a vibration transmission sheet 1 and a vibration plate 2, wherein the vibration transmission sheet 1 is arranged as a first annular body 111, and at least two first struts 112 which are converged towards the center in the inner ring 111; the vibration plate is provided as a second torus 121, and at least two second struts 122 which are converged toward the center in the outer ring 121; the vibration transmission sheet 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 to a voice coil 8 which is acted upon by the magnetic system.

However, this device has the following problems: the support rod is designed into a straight rod, the design deformation of the support rod straight rod is small, the elastic coefficient is large, and the vibration transmission sheet is difficult to realize lower low frequency during working.

Disclosure of Invention

In view of the foregoing, it is an object of the present application to provide a vibration transmitting plate device for a bone conduction speaker, which can improve the sound quality of the bone conduction speaker by further improving the structure of the vibration transmitting plate.

In order to achieve the above purpose, the technical scheme provided by the application is as follows:

the vibration transmission sheet is characterized by comprising an inner structure and an outer structure; a strut connecting the inner structure and the outer structure; wherein the strut provides a first contact point on the inner structure and a second contact point on the outer structure; taking the center of the internal structure as a reference point, wherein 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; and starting from the first reference line, forming an angle from rotating around a reference point to the second reference line into a supporting rod included angle, wherein the range of the supporting rod included angle is 0-360 degrees.

Preferably, the support rod of the vibration transmission sheet is a bent rod.

Preferably, the number of the struts is greater than or equal to three.

Preferably, the strut angle is greater than 60 degrees.

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 supporting 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.

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

Preferably, the curved surface of the vibration transmission sheet supporting rod is wavy or zigzag.

Preferably, the vibration-transmitting sheet is made of a metal material.

Preferably, the hollow area between the outer structure and the inner structure is 30% or more.

The application also provides a bone conduction loudspeaker, which is characterized in that the vibration transmission sheet is used.

Compared with the prior art, the application has the beneficial effects that: the support rod of the vibration transmission sheet is a bent rod, so that nonlinear distortion of the vibration transmission sheet in the working process can be effectively reduced compared with a straight rod, and stability of sound quality is maintained.

Additional features of the application will be set forth in part in the description which follows. Additional features of part of the application will be readily apparent to those skilled in the art from a examination of the following description and the corresponding figures or a study of the manufacture or operation of the embodiments. The features of the present disclosure may be implemented and realized in the practice or use of the methods, instrumentalities and combinations of various aspects of the specific embodiments described below.

Drawings

In order to more clearly illustrate the technical solution of the embodiments of the present application, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is apparent that the drawings in the following description are only some embodiments of the present application, and it is apparent to those skilled in the art that the present application can be applied to other similar situations according to the drawings without inventive effort. Unless otherwise apparent from the context of the language, the same reference numbers in the drawings refer to the same structures and operations.

Fig. 1 is a structural view of a bone conduction speaker apparatus;

FIG. 2 is a graph showing the relationship between the force of vibration and displacement in the direction of vibration when the struts are straight bars and bent bars, respectively, according to an embodiment of the present application;

FIG. 3 is a graph showing the change of the 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 application;

fig. 4 is a structural view of a first bone conduction speaker vibration-transmitting sheet provided according to an embodiment of the present application;

fig. 5 is a structural diagram of a second bone conduction speaker vibration-transmitting sheet provided according to an embodiment of the present application;

fig. 6 is a structural view of a third bone conduction speaker vibration-transmitting sheet provided according to an embodiment of the present application;

FIG. 7 is a schematic illustration of a strut angle definition provided in accordance with an embodiment of the present application;

fig. 8 is a schematic structural view of deformation rotation of a strut of a vibration-transmitting plate of a bone conduction speaker according to an embodiment of the present application;

fig. 9 is a structural diagram of a vibration-transmitting sheet of a bone conduction speaker when the included angles of the struts are sequentially 100 degrees, 50 degrees, 25 degrees and 205 degrees according to an embodiment of the present application;

FIG. 10 illustrates the rotational angles of the inner and outer structures of the strut of FIG. 9 when the angle of the strut is different in accordance with one embodiment of the present application;

FIG. 11 is a schematic diagram of a strut flipping according to an embodiment of the present application;

FIG. 12 is a schematic illustration of a strut bending degree definition provided in accordance with an embodiment of the present application;

FIG. 13 is a diagram of a vibration transmitting sheet with strut bending degrees of 1:3.3,1:2.5 and 1:1.7, respectively, according to an embodiment of the present application;

FIG. 14 is a correspondence between flipping force and flipping displacement under the vibration transmitting plate of FIG. 13, provided in accordance with an embodiment of the present application;

fig. 15 is a structural diagram of an inner structure and an outer structure of a vibration-transmitting sheet of a bone conduction speaker according to an embodiment of the present application;

fig. 16 is a structural diagram of a vibration-transmitting sheet for a bone conduction speaker according to an embodiment of the present application;

fig. 17 is a graph showing a correspondence between a deflection angle and a deflection force of a vibration-transmitting plate of a bone conduction speaker according to an embodiment of the present application;

fig. 18 is a structural view of a strut for a vibration-transmitting plate of a bone conduction speaker according to an embodiment of the present application;

fig. 19 is a structural view of a fourth bone conduction speaker vibration-transmitting sheet provided according to an embodiment of the present application;

fig. 20 is a structural view of a fifth bone conduction speaker vibration-transmitting sheet provided according to an embodiment of the present application;

fig. 21 is a structural view of a sixth bone conduction speaker vibration-transmitting sheet provided according to an embodiment of the present application;

fig. 22 is a structural view of a seventh bone conduction speaker vibration-transmitting sheet provided according to an embodiment of the present application;

fig. 23 is a structural view of an eighth bone conduction speaker vibration-transmitting sheet provided according to an embodiment of the present application;

fig. 24 is a structural view of a ninth bone conduction speaker vibration-transmitting sheet provided according to an embodiment of the present application;

fig. 25 is a structural view of a tenth bone conduction speaker vibration-transmitting sheet according to an embodiment of the present application.

Detailed Description

The application is further described below by means of specific embodiments in connection with the accompanying drawings.

First embodiment:

fig. 2 is a graph showing the relationship between the force of vibration and the displacement in the direction of vibration when the strut is a straight rod and a bent rod, respectively, according to an embodiment of the present application. As can be seen from fig. 2, when the strut is a straight rod, the elastic coefficient (the ratio of force to displacement on the curve) exhibited by the straight rod vibration transmitting sheet is not linear but becomes larger and larger with the increase of the intensity of vibration (increase of displacement). For the bent rod vibration transmitting sheet, the effective distance of the bent rod is larger than that of the straight rod under the same shape and area, so that the force and displacement of the bent rod basically show an approximate straight line shape in the vibration process. Therefore, compared with the vibration transmission sheet with the straight rod serving as the supporting rod, the technical advantage of using the bent rod vibration transmission sheet is that nonlinear distortion of the vibration transmission sheet in the working process can be effectively reduced, and stability of sound quality is maintained.

Fig. 3 compares the change of the elastic coefficients of the straight rod vibration transmission sheet and the bent rod vibration transmission sheet under different vibration displacements, and it can be obviously seen that when the straight rod vibration transmission sheet vibrates severely, the elastic coefficient of the straight rod vibration transmission sheet becomes larger and larger, and the change of the elastic coefficient of the bent rod vibration transmission sheet is very flat. The elastic coefficient of the vibration transmission sheet has a decisive influence on the tone quality of the vibration loudspeaker, so that the nonlinear distortion condition can be obviously improved by adopting the design of a bent rod, and the tone quality of the bent rod vibration transmission sheet can be more stable.

Specific embodiment II:

fig. 4 shows a first bone conduction speaker vibration-transmitting sheet structure according to an embodiment of the present application. In some embodiments, the vibration-transmitting plate is made of a metal material and has a ring-shaped structure including an inner structure 410, i.e., an inner ring, an outer structure 430, i.e., an outer ring, and struts connecting the inner ring and the outer ring. FIG. 4 shows the number of struts as 3 (420-1, 420-2, 420-3). In some embodiments, the shape of the inner structure 410 and/or the outer structure 430 may be circular (as shown in fig. 4), triangular (as shown in fig. 20), quadrilateral, pentagonal, hexagonal (as shown in fig. 19), and any other similar geometric shape (as shown in fig. 25).

FIG. 5 shows a number of struts of 4 (520-1, 520-2, 520-3, 520-4). FIG. 6 shows the number of struts as 5 (620-1, 620-2, 620-3, 620-4, 620-5). Compared with two supporting rods or one supporting rod, the three to five supporting rods have the advantages of better stability, difficult deflection and stronger reliability in use. By deflection is meant that the inner ring plane is not parallel to the outer ring plane, and there is an abnormal state of the included angle, which may generate some abnormal vibrations during operation, which is disadvantageous in that the normal sound quality of the bone conduction speaker is exhibited. Compared with more struts, the space between the inner ring and the outer ring is limited, the fewer struts can enable the length of each strut to be longer, and meanwhile, due to the fact that the number of the struts is increased, the elasticity of the vibration transmission sheets with the same size is reduced, the vibration transmission sheets cannot obtain lower resonant frequency, and the sound quality of the bone conduction loudspeaker can be adversely affected.

In some embodiments, the vibration-transmitting plate is made of a metallic material, including but not limited to steel (e.g., but not limited to stainless steel, carbon steel, etc.), light-weight alloys (e.g., but not limited to aluminum alloys, beryllium copper, magnesium alloys, titanium alloys, etc.). Other single or composite materials that achieve the same properties are also possible. For composite materials, such as, but not limited to, glass fibers, carbon fibers, boron fibers, graphite fibers, graphene fibers, silicon carbide fibers, or aramid fibers.

Third embodiment:

the embodiment is a further improvement on the basis of the second embodiment, and the included angle of the supporting rod in the first embodiment is further optimized. At this time, the vibration-transmitting sheet shown in fig. 7 may be regarded as a ring structure, and the outer structure is an outer ring and the inner structure is an inner ring. The definition of the strut angle is shown in fig. 7: the strut 720-1 provides a first contact point on the inner structure 710, i.e., the strut 720-1 is located at the location point A of the inner ring 710, and the strut 720-1 provides a second contact point on the outer structure 730, i.e., the strut 720-1 is located at the location point B of the outer ring 730; the inner structure 710 has a reference point, i.e., 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; the angle θ formed by rotating the first reference line OA around the reference point (e.g., the center point O) to the second reference line OB is the strut angle.

Preferably, the included angle of the supporting rod is larger than 60 degrees, more preferably, the included angle of the supporting rod is larger than 80 degrees, still more preferably, the included angle of the supporting rod is larger than 90 degrees, and the included angle of the supporting rod adopted by the application is 100 degrees. In some embodiments, the strut angle may be greater than 180 degrees. When the vibration transmission sheet works, the inner ring and the outer ring are separated to a certain extent along the axial direction of the inner ring and the outer ring, and at the moment, certain rotation is generated between the inner ring and the outer ring to reduce the deformation of the support rod, and the rotation mode is shown in figure 8.

The vibration transmitting sheets with strut angles of θ1, θ2, θ3 and θ4 are described in sequence as shown in fig. 9. Wherein θ1 is 100 degrees, θ2 is 50 degrees, θ3 is 25 degrees, and θ4 is 205 degrees.

Fig. 10 is a graph depicting the rotation angles of the inner and outer rings when the strut angles of fig. 9 are different, and it can be seen that the greater the strut angle, the less rotation is produced between the inner and outer rings for the same inner and outer ring axial separation distance. Therefore, the angle of the included angle of the support rod is increased, and the rotation of the vibration transmission sheet during working can be reduced, so that the reliability of the vibration system is higher.

Fourth embodiment:

this embodiment is a further improvement based on the third embodiment, and is mainly further limited with respect to the bending degree of the strut. When the bar is not stressed at both ends of the bar, but is stressed perpendicular to the plane of the bar at the middle portion of the bar, the bar itself will turn over, as shown in fig. 11. The vibration-transmitting sheet is easy to interfere with the upper and lower structures after overturning, and the performance is greatly changed. The degree of turning over of the strut is greatly affected by the degree of bending of the strut, and the greater the degree of bending of the strut is, the easier the turning over occurs. In the present specification, the degree of bending of the strut is defined as shown in fig. 12: a connecting line AB is formed between a connecting point A of the strut 1220-1 at the position of the inner ring 1210 and a connecting point B of the strut 1220-1 at the position of the outer ring 1230, the length of the connecting line AB is L, a point C is found on the strut 1220-1, the vertical distance between the point C and the connecting line AB is the largest, the vertical distance is recorded as D, the bending degree is defined as the ratio D between the lengths, L, and when the ratio D is larger, the bending degree of the strut is larger.

FIG. 13 depicts vibration transmitting sheets with strut bending levels of 1:3.3,1:2.5 and 1:1.7, respectively. Fig. 14 depicts the correspondence between the turning force and the turning displacement under the vibration-transmitting sheet of fig. 13, and it can be seen from the figure that the turning displacement is larger when the degree of bending of the strut is larger, corresponding to the same turning force.

Fifth embodiment:

the embodiment is a further improvement based on the fourth embodiment, and when the stress of the inner ring or the outer ring of the vibration transmission sheet is not along the axial direction or the stress on the ring is uneven, the vibration transmission sheet can deflect. For example, when the outer ring of the vibration-transmitting sheet is uniformly stressed and the inner ring is unevenly stressed, deflection may occur as shown in fig. 15, resulting in non-parallel outer ring planes of the vibration-transmitting sheet and inner ring planes. In this case, the deformation of the struts is not only in the axial direction of the inner and outer rings, but also a moment of torsion T of the torsion struts, at which the torsion angle occursRelated to length l, width b and thickness h of the strutIs tied toWhere 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 strut, typical values of β are shown in the following table:

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

deflection equation s=fl compared to struts ³ /Ebh ³ Wherein s is the axial offset distance between the inner ring and the outer ring of the vibration transmission sheet, F is the force required by the inner ring and the outer ring of the vibration transmission sheet when axially offset, 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 inner ring plane and the outer ring plane), and h is the thickness of the support rod (corresponding to the direction vertical to the inner ring plane and the outer ring plane). Can unify both to be simplified intoThe struts are less likely to twist with the same strut material, elasticity (s/F unchanged), and a viable way is to increase the length l of the struts and increase the coefficient β. It can be seen from the table that as the value of b/h increases, the coefficient β increases, and the twist angle at the same moment of couple T decreases, and the strut is less prone to twist. Therefore, by increasing the width b of the support rod and reducing the thickness h of the support rod, the support rod is not easy to twist, so that deflection of the support rod is reduced, and the reliability of the vibration transmission sheet is improved.

In practice, there are some differences from theoretical calculations because the vibration-transmitting sheet struts are not ideal rods. The deflection angle is defined as the included angle between the plane of the outer ring and the plane of the inner ring when deflection occurs between the inner ring and the outer ring of the vibration transmitting sheet. The deflection force is a force applied axially along the plane of the inner and outer rings at the inner ring position. The deflection force has positive and negative forces along the axis, respectively applied at two locations on the inner ring of the same diameter.

Fig. 16 depicts vibration-transmitting sheets having strut widths of 1mm and 0.5mm, the correspondence between deflection angle and deflection force being as shown in fig. 17, from which it can be seen that: when the width of the strut is reduced, the deflection angle is significantly increased under the same deflection force.

The dimensions of the inner ring are further defined in this embodiment for the length, width and arc of the struts: length and width of the rod, in actual product: the diameter of the outer ring is 17mm, the diameter of the inner ring is 8mm, the width of the supporting rod is 1mm, and the length is 13mm.

Specific embodiment six:

this embodiment is a further improvement of the first to fifth embodiments, in which when the inner ring diameter and the outer ring diameter of the vibration-transmitting plate are determined, the space between the inner ring and the outer ring is also determined. In order to further increase the length of the strut, the elasticity of the strut of the vibration transmitting sheet is improved to improve the resonant frequency of the vibration transmitting sheet and improve the reliability of the bone conduction vibration speaker during operation, the strut of the vibration transmitting sheet is designed into a curved surface shape in the direction perpendicular to the plane of the vibration transmitting sheet, wherein fig. 18 is two typical curved surface designs, and the cross section of the strut in the direction perpendicular to the plane of the vibration transmitting sheet is wavy or zigzag. In fig. 18 (a), the plane 1803 in which the inner and outer rings lie is located between the highest point 1801 and the lowest point 1802 of the curved surface. In fig. 18 (b), the highest point 1801 and the lowest point 1802 of the curved surface are located on one side of a plane 1803 where the inner ring and the outer ring are located. Preferably, in fig. 18 (b), the highest point 1801 (or lowest point 1802) of the curved surface is on a plane 1803 where the inner and outer rings lie.

Specific embodiment seven:

the embodiment is an improvement on the basis of the second embodiment, the outer ring and the inner ring of the vibration transmission sheet are connected through the supporting rods, a certain hollow area is required to be ensured between the inner ring and the vibration transmission sheet of the outer ring, and the hollow area is positioned on the two rings. The hollowed-out area can be a space which is not occupied by the support rod between the inner ring and the outer ring on the plane of the vibration transmission sheet. For example, as shown in FIG. 4, a hollowed-out area 440-1 surrounded by struts 420-1, 420-2, inner ring 410 and outer ring 430; or a hollowed-out area 440-2 surrounded by the struts 420-1, 420-3, the inner ring 410 and the outer ring 430; or a hollowed-out area 440-3 surrounded by struts 420-2, 420-3, inner ring 410 and outer ring 430. The hollow area is used for communicating air above the vibration transmission sheet and air below the vibration transmission sheet, so that the leakage sound of the bone conduction loudspeaker is reduced. When the hollowed-out area is larger, the effect that the vibration transmission piece is connected with air up and down is better, and the bone conduction loudspeaker leaks sound less. Meanwhile, when the hollowed-out area on the vibration transmission sheet is larger, the vibration area of the vibration transmission sheet is smaller, and the generated leakage sound is smaller. Preferably, the hollowed-out area ratio (i.e. the ratio of the hollowed-out area to the area between the inner ring and the outer ring) is greater than 30%, more preferably, the hollowed-out area ratio is greater than 40%, still more preferably, the hollowed-out area ratio is greater than 50%.

Specific embodiment eight:

the present embodiment is an improvement based on the second embodiment, in which the metal flat plate for making the vibration-transmitting sheet may be a flat surface with a uniform thickness, or may be a flat surface with a non-uniform thickness along the radial direction. The rods of the vibration-transmitting sheet may be made thick near the inner structure and thin near the outer structure. The inner and outer structures of the vibration-transmitting sheet may be formed in a non-circular shape, as shown in fig. 19 and 20, fig. 19 shows that the outer structure 1930 of the vibration-transmitting sheet is hexagonal, and fig. 20 shows that the inner structure 2010 of the vibration-transmitting sheet is triangular. The struts may also be of non-uniform width, as shown in fig. 21, and struts 2120 may have a structure of non-uniform thickness along the rod direction.

Specific embodiment nine:

the second embodiment is an improvement based on the second embodiment, and the connection between the inner ring and the inner ring of the vibration-transmitting sheet and the connection between the outer ring and the outer ring of the vibration-transmitting sheet can be in various different manners, including bonding, welding, riveting and the like.

The vibration transmission sheet and the object can be connected in a glue bonding mode. The glue bonding mode occupies smaller space and can be used for connecting various different materials. Meanwhile, the elastic performance of the vibration transmission sheet can be changed through the selection of different glues. Compared with the use of harder glue, when softer glue is used, the elastic performance of the vibration transmission sheet is better, and more low frequencies can be obtained.

When the object is a plastic part, the vibration transmission sheet and the object can be connected in a heat riveting mode. As shown in fig. 22, the vibration-transmitting plate has holes 2231 in the outer ring 2230, and reserved plastic rivets are provided at corresponding positions of the object. After the two are assembled and positioned, the rivet column protruding from the surface of the vibration transmission sheet is pressed by the metal rivet head to be reshaped after being melted by controlled heat. The mode does not need additional components, reduces the processing cost and improves the processing efficiency.

Specific embodiment ten:

the inner ring and the outer ring of the vibration transmission sheet can be made into different structures for positioning objects on the inner ring and the outer ring. The structure on the inner ring of the vibration transmission sheet can be a plane structure or not in the same plane. The in-plane structure can be used for positioning with harder materials, such as positioning columns on the inner ring and the outer ring, and positioning holes on the vibration transmission sheets. For softer inner and outer ring materials, a structure in a non-plane can achieve better positioning effect. In the vibration-transmitting plate structure shown in fig. 23, a rib 2340 is added to the outer ring 2330 of the vibration-transmitting plate for assembling the object on the outer ring. When the connecting piece of the outer ring is a soft piece such as a silicone, it can be positioned by this edge so that it fits into place. The rib can be made by making a bent metal piece and spot-welding the bent metal piece and the vibration-transmitting piece together, or other forms.

Specific example eleven:

the inner ring and the outer ring of the vibration transmission sheet are connected by a rod, and the vibration transmission sheet, the inner ring and the outer ring are the same as one device. On the basis, other materials or structures can be added between the inner ring and the outer ring, so that the performance of the vibration transmitting sheet can be changed.

As shown in fig. 24, a waterproof film may be attached to the vibration-transmitting sheet for waterproofing. The inner ring and the outer ring of the vibration transmission sheet are connected by a rod, a gap exists between the rod and the rod, and water can reach the other side from one side through the vibration transmission sheet structure. The vibration transmission sheet is additionally provided with the waterproof film, so that water can be prevented from reaching the other side from one side through the vibration transmission sheet, and the film is softer, so that the influence on the elasticity of the vibration transmission sheet is small. The waterproofing membrane may be in a breathable form through which water cannot pass, while gas can pass, so as not to affect the acoustic performance of the vibration speaker. The waterproof film can be connected with the vibration transmission sheet in an adhesive mode. In particular, double sided adhesive bonding may be employed.

Twelve specific embodiments:

the vibration-transmitting plate as shown in FIG. 25 may include an inner structure 2510 and an outer structure 2530, as well as three struts (2520-1, 2520-2 and 2520-3). In some embodiments, the number of struts may not be limited to 3, and may be 3 or more. Wherein the center point of the internal structure 2510 is point D, the contact point of the strut 2520-1 and the internal structure 2510 is point E, the contact point of the strut 2520-1 and the external structure 2530 is point F, and the included angle θ4 formed by the straight line DE and the straight line DF is the strut included angle. The shape of the outer structure 2530 may be modified according to circumstances, and may be circular (as shown in fig. 4), quadrangular, pentagonal, hexagonal (as shown in fig. 19), triangular (as shown in fig. 20), or an irregular arbitrary geometric shape as shown in fig. 25.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A bone conduction speaker, characterized in that includes inner ring article and outer ring article and transmits the piece that shakes, it includes to transmit the piece that shakes:

the inner structure is used for being connected with the inner ring object, and the outer structure is used for being connected with the outer ring object; and

a strut connecting the inner structure and the outer structure;

wherein the strut provides a first contact point on the inner structure and a second contact point on the outer structure;

taking the center of the internal structure as a reference point, wherein 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 the first reference line around the reference point to the second reference line is a strut included angle, and the strut included angle is greater than 25 degrees or 50 degrees or 60 degrees or 80 degrees or 90 degrees or 100 degrees or 180 degrees or 205 degrees and less than 360 degrees.

2. The bone conduction speaker of claim 1 wherein the struts are bent rods.

3. The bone conduction speaker of claim 1, wherein the first contact point and the second contact point form a first straight line, the first straight line having a length of a first distance, a maximum perpendicular distance between a point on the strut and the first straight line being a second distance, a ratio of the second distance to the first distance being 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.

4. The bone conduction speaker of claim 1 wherein the ratio of the width of the strut to the thickness of the strut is in the range of 3-10.

5. A bone conduction speaker according to claim 1, wherein the shape of the inner structure and/or the outer structure is circular, triangular, quadrilateral, pentagonal or hexagonal.

6. The bone conduction speaker of claim 1 wherein the number of struts is equal to or greater than three.

7. The bone conduction speaker of claim 1 wherein the width of the struts is non-uniform; and/or the strut is thick near the inner structure and thin near the outer structure.

8. The bone conduction speaker of claim 1 wherein the connection of the struts to the inner structure and the outer structure has an arcuate transition.

9. The bone conduction speaker of claim 1, wherein the strut has a width of 0.5mm or 1mm.

10. The bone conduction speaker of claim 1 wherein said vibration-transmitting plate has a pilot hole therein.

11. The bone conduction speaker according to claim 1, wherein the struts are arranged in a curved shape in a direction perpendicular to a plane of the vibration-transmitting sheet.

12. The bone conduction speaker according to claim 11, wherein the strut is wavy or zigzag in a cross section perpendicular to the plane of the vibration-transmitting plate.

13. The bone conduction speaker of claim 11, wherein the planes in which the inner and outer structures lie are at the highest and lowest points of a curved surface.