CN217428322U - Vibration transmission sheet and bone conduction earphone - Google Patents
Vibration transmission sheet and bone conduction earphone Download PDFInfo
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- CN217428322U CN217428322U CN202220621093.XU CN202220621093U CN217428322U CN 217428322 U CN217428322 U CN 217428322U CN 202220621093 U CN202220621093 U CN 202220621093U CN 217428322 U CN217428322 U CN 217428322U
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Abstract
The embodiment of this specification provides a vibration conduction piece and bone conduction earphone, includes: the middle area of the annular structure is a hollow area; the vibrating piece is configured to be connected with the magnetic circuit system, and the vibrating piece is located in the hollow-out area of the annular structure; and a plurality of rods configured to connect the ring structure and the vibrating member, the plurality of rods being spaced apart along a circumferential direction of the vibrating member; wherein at least one of the plurality of rods comprises at least two curved portions having centers of curvature on both sides of the at least one rod. The vibration transmission sheet provided by the specification can reduce the elastic coefficient of the vibration transmission sheet in the direction of the load causing the failure of the vibration transmission sheet by arranging the plurality of rod pieces with the bending parts, improve the fatigue resistance of the vibration transmission sheet and reduce the risk of failure of the vibration transmission sheet.
Description
Technical Field
The specification relates to the field of bone conduction devices, in particular to a vibration conduction sheet and a bone conduction earphone.
Background
The vibration transmission piece is an important component in the bone conduction earphone, and can transmit vibration generated by a vibration component in the bone conduction earphone to the shell, and then the vibration is transmitted to auditory nerves of a human body through skin, subcutaneous tissues and bones of the human body, so that the human body can hear the sound. Because the vibration conduction piece is connected with the magnetic circuit of bone conduction earphone, when bone conduction earphone is in operating condition, the vibration conduction piece is in the vibration state under magnetic circuit's effect always, leads to the vibration conduction piece often to have the cracked condition to take place, and this can direct influence bone conduction earphone's quality, can lead to the unable normal use's of bone conduction earphone even the condition.
Accordingly, it is desirable to provide a vibration plate having a high structural reliability so as to improve the service life of the vibration plate.
SUMMERY OF THE UTILITY MODEL
One of the embodiments of the present specification provides a vibration transfer sheet, including: the middle area of the annular structure is a hollow area; the vibrating piece is configured to be connected with the magnetic circuit system, and the vibrating piece is positioned in the hollow-out area of the annular structure; and a plurality of rods configured to connect the ring-shaped structure and the vibrating member, the rods being spaced apart from each other in a circumferential direction of the vibrating member; wherein at least one of the plurality of rods comprises at least two bends having centers of curvature on either side of the at least one rod.
One of the embodiments of the present specification provides a bone conduction headset, including: a shell structure, a magnetic circuit structure and the vibration transmission sheet in any one of the above embodiments; the shell structure is provided with an accommodating space, and the magnetic circuit structure and the vibration transmission piece are positioned in the accommodating space; the annular structure of the vibration transmission piece is circumferentially connected with the inner wall of the shell structure, and the magnetic circuit structure is connected with the vibration piece of the vibration transmission piece.
Compared with the prior art, the vibration transmission piece provided by the specification has the following beneficial effects: the annular structure and the vibrating piece are connected through the plurality of rod pieces, one rod piece in the plurality of rod pieces comprises at least two bending portions, the curvature centers of the at least two bending portions are respectively located on two sides of the rod piece, the number of the bending portions of the rod piece can be increased under the condition of limited space, the length of the rod piece is further increased, and therefore the elastic coefficient of the rod piece in the length direction of the hollow area can be better reduced, the elastic coefficient of the vibration transmission piece in the direction of the load causing failure (plastic deformation or fracture) of the vibration transmission piece is reduced, the fatigue resistance of the vibration transmission piece is improved, and the risk of failure of the vibration transmission piece is reduced.
Drawings
FIG. 1 is a schematic diagram of a vibration plate according to some embodiments herein;
FIG. 2 is a schematic view of a first rod according to some embodiments of the present disclosure;
FIG. 3A is a schematic view of a failure mode of a vibration transfer plate according to some embodiments of the present disclosure;
FIG. 3B is a schematic illustration of a failure mode of a vibration transfer plate according to some embodiments of the present description;
FIG. 4A is a schematic view of a stress distribution of a vibration plate under load along a length of a hollowed-out region according to some embodiments of the present disclosure;
FIG. 4B is a schematic view of a stress distribution of a vibration plate under load along a width of a hollowed-out region according to some embodiments of the present disclosure;
FIG. 4C is a schematic view of a stress distribution of a vibration transfer plate under axial load according to some embodiments of the present description;
FIG. 4D is a schematic view of a stress distribution of a vibration transfer plate under a roll-over load according to some embodiments of the present disclosure;
FIG. 5A is a graphical representation of a distribution of fatigue failure times for a vibration plate under load along a length of a hollowed-out region in accordance with certain embodiments of the present description;
FIG. 5B is a graphical representation of a distribution of the number of fatigue failures of the vibration transfer plate under load across the width of the hollowed-out region in accordance with some embodiments of the present description;
FIG. 5C is a graphical illustration of a distribution of the number of fatigue failures of the vibration transfer plate under axial load in accordance with certain embodiments of the present disclosure;
FIG. 5D is a graphical illustration of a distribution of the number of fatigue failures of the vibration transfer plate under a rollover load in accordance with certain embodiments of the present disclosure;
fig. 6 is a graph showing the variation of the elastic modulus of the vibration-transmitting plate along the length direction of the hollowed-out region, the average stress of the cross section corresponding to the maximum curvature of the bent portion of the third rod, and the change of the width of the rod by multiple according to some embodiments of the present disclosure;
FIG. 7 is a graphical representation of the number of cycles to fatigue failure of a vibration plate under load along the length of a hollowed-out region, the change in the modulus of elasticity along the length of the hollowed-out region, versus the multiple of the width of a rod according to some embodiments of the present disclosure;
fig. 8 is a graph showing the change in the elastic modulus of the vibration-transmitting plate in the flip direction, the average stress of the cross section corresponding to the connection of the third rod with the ring structure, and the change in the width of the rod according to some embodiments of the present disclosure;
FIG. 9 is a graphical representation of the number of cycles to failure of the vibration plate under load in the flip direction, spring rate in the flip direction, and the multiple of the width of the bar in accordance with certain embodiments of the present disclosure;
fig. 10 is a schematic structural view of a third rod according to some embodiments herein;
FIG. 11 is a schematic structural view of a vibration plate according to some embodiments of the present disclosure;
FIG. 12 is a schematic structural view of a second rod according to some embodiments of the present disclosure;
fig. 13 is a schematic structural view of a third rod according to some embodiments herein;
FIG. 14 is a schematic structural view of a vibration plate according to some embodiments of the present disclosure;
FIG. 15 is a schematic structural view of a third rod according to some embodiments of the present disclosure;
FIG. 16 is a schematic view of a vibration plate according to some embodiments of the present disclosure;
fig. 17 is an overall schematic view of a bone conduction headset according to some embodiments of the present description;
fig. 18 is a cross-sectional view of a bone conduction headset according to some embodiments of the present description.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only examples or embodiments of the present description, and that for a person skilled in the art, the present description can also be applied to other similar scenarios on the basis of these drawings without inventive effort. Unless otherwise apparent from the context, or otherwise indicated, like reference numbers in the figures refer to the same structure or operation.
The embodiments of the present disclosure provide a vibration transmission plate, which may include an annular structure, a vibrating element connected to a magnetic circuit system, and a plurality of rods for connecting the annular structure and the vibrating element, wherein a middle region of the annular structure is a hollow region, the vibrating element is located in the hollow region of the annular structure, and the plurality of rods are spaced apart from each other in a circumferential direction of the vibrating element. In some embodiments, one of the plurality of rod members includes at least two bending portions, and the centers of curvature of the at least two bending portions are respectively located on two sides of the rod member, so that the elastic coefficient of the vibration transmission plate in the direction of the load causing the vibration transmission plate to fail (plastic deformation or fracture) can be reduced, the fatigue resistance of the vibration transmission plate can be improved, and the risk of failure of the vibration transmission plate can be reduced.
FIG. 1 is a schematic diagram of a vibration plate according to some embodiments of the present disclosure. As shown in fig. 1, in some embodiments, the vibration transfer plate 100 may include a ring structure 110, a vibration member 120, and a plurality of rod members for connecting the ring structure 110 and the vibration member 120. In some embodiments, the shape (outer contour shape) of the ring-shaped structure 110 may be a racetrack shape as shown in fig. 1, and may also be a regular shape or an irregular shape such as a circle, an ellipse, a triangle, a quadrangle, a pentagon, a hexagon, etc. In some embodiments, the central region of the ring structure 110 is a hollow region 140. The shape of the hollow-out area 140 can be regarded as the inner contour shape of the ring-shaped structure 110. In some embodiments, the inner and outer contour shapes of the ring structure 110 may be the same shape. For example, as shown in fig. 1, the outer contour of the ring structure 110 is shaped like a racetrack, and the hollow area 140 (the inner contour of the ring structure) is also shaped like a racetrack. Further, the hollow area has a length direction (i.e., X direction shown in fig. 1) and a width direction (i.e., Y direction shown in fig. 1). In some embodiments, the shape of the hollowed-out area 140 may be different from the outer contour shape of the ring-shaped structure 110. For example, the outer contour of the ring structure 110 may be a racetrack shape, and the shape of the hollow area 140 may be a circle, a rectangle, or other shapes.
In some embodiments, the vibration plate 100 may be made of a metallic material, which may include, but is not limited to, steel (e.g., stainless steel, carbon steel, etc.), light alloys (e.g., aluminum alloys, beryllium copper, magnesium alloys, titanium alloys, etc.). In some embodiments, the vibration plate 100 may be made of other single or composite materials that achieve the same performance. For example, the composite material may include, but is not limited to, reinforcing materials such as glass fibers, carbon fibers, boron fibers, graphite fibers, silicon carbide fibers, or aramid fibers.
In some embodiments, the vibrating element 120 is located in the hollow area 140 for connecting to a magnetic circuit system (not shown). In some embodiments, the vibrating member 120 may have a structure symmetrical in left and right directions and also symmetrical in up and down directions as shown in fig. 1. In some embodiments, the shape of the vibrating member 120 may be a circle, a triangle, a quadrangle, a pentagon, a hexagon, or other regular or irregular shapes. In some embodiments, the shape of the vibrating member 120 may be the same as the shape of the ring structure 110. For example, the ring structure 110 and the vibrating member 120 may be both circular in shape, i.e., the ring structure 110 and the vibrating member 120 may constitute concentric circles. In some embodiments, the magnetic circuit system may be connected to one of the surfaces of the vibrating element 120 by means including, but not limited to, gluing, welding, clamping, pinning, bolting, etc.
In some embodiments, the plurality of rods are located in the hollow region between the ring structure 110 and the vibrating member 120, when the vibration transmitting plate 120 is in an operating state, the vibration of the magnetic circuit system can drive the vibrating member 120 to vibrate in a direction perpendicular to the plane of the vibration transmitting plate 100 (i.e., a direction perpendicular to the paper plane in the drawing), so that the vibration generated by the magnetic circuit system can be transmitted to the shell of the bone conduction earphone through the vibration transmitting plate 100, and the vibration of the shell is transmitted to the auditory nerve of the user through the bones, blood, muscles, etc. of the head of the user, so that the user can hear the sound.
In some embodiments, the vibration plate 100 may be a unitary structure. For example, the vibration transmitting sheet 100 may be manufactured by injection molding, casting, 3D printing, or the like. For another example, the vibration transmission plate 100 may be manufactured by cutting the ring structure 110, the vibrating member 120, and the plurality of rod members from a sheet-shaped material by laser cutting or the like. In some embodiments, the vibration plate 100 may be a split structure. For example, the ring structure 110, the vibrating member 120, and the plurality of rods may be connected to form the vibrating plate 100 by gluing, welding, clamping, etc.
In some embodiments, the number of the rod members in the vibration-transmitting plate 100 may be plural, so as to realize the connection between the ring-shaped structure 110 and the vibrating member 120. In some embodiments, the number of the rod members in the vibration transmission plate may be 3 to 5, which may ensure that the vibration transmission plate 100 has better stability, less possibility of deflection and stronger reliability during the working process. The deviation refers to the condition that the plane of the vibrating element 120 is not parallel to the plane of the ring-shaped structure 110, i.e. the abnormal condition that the two planes form an included angle, which may generate some abnormal vibrations during the operation of the vibrating plate 100, and is not favorable for representing the normal sound quality of the bone conduction earphone.
In some embodiments, the plurality of rods for connecting the ring structure 110 and the vibrating member 120 may include a first rod 131, a second rod 132, and a third rod 133. The first rods 131, the second rods 132, and the third rods 133 are spaced apart in the circumferential direction of the vibrating member 120. In some embodiments, at least one of the plurality of rods has at least two bends. For example, the first rod 131 has two bent portions, and the second rod 132 and the third rod 133 each have one bent portion. For another example, the first rod 131 has two bent portions, the second rod 132 has three bent portions, and the third rod 133 has two bent portions. Referring to fig. 2, the first rod 131 is taken as an example, the first rod 131 includes a first bending portion 1311 and a second bending portion 1312, and a curvature center a and a second bending portion B of the first bending portion 1311 are respectively located at both sides of the first rod 131. It should be noted that, in the present specification, the bending portion may be understood as a portion where the rod member is bent, a curvature of the bending portion refers to a maximum curvature of the bending portion, and a curvature center of the bending portion refers to a curvature center corresponding to a maximum curvature.
In some embodiments, the rods (e.g., the first rod 131, the second rod 132, and the third rod 133) may be made to be "softer" by reducing the elastic coefficient of the rods in a specific direction (e.g., the length direction of the hollow area), so as to effectively reduce the impact of the load on the rods in the specific length direction, thereby improving the service life of the vibration transmission plate 100. Illustratively, by providing one or more bending portions having curvatures satisfying a certain condition, the length of the rod can be increased, thereby effectively reducing the lower elastic coefficient of the rod in the length direction of the hollow area. For example, the first rod 131, the second rod 132, and the third rod 133 may include at least one curvature of 2mm -1 -10mm -1 The curved portion of (2). For another example, the first rod 131, the second rod 132, and the third rod 133 may include at least one curvature of 4mm -1 -10mm -1 The curved portion of (3). For another example, the first rod 131, the second rod 132, or the third rod 133 may include at least one curvature of 6mm -1 -10mm -1 The bending part of the rod piece is larger in bending degree when the curvature of the bending part is larger, so that the number of bending parts of the rod piece can be increased under the condition of limited space, the length of the rod piece is further increased, and the elastic coefficient of the rod piece in the length direction of the hollow area can be better reduced. In some embodiments, the curvature of at least one of the first bend 1311 and the second bend 1312 may be 2mm -1 -10mm -1 。
In some embodiments, each rod further comprises a transition part, the transition part is connected between the two bending parts, and the inner normal directions of the parts connected with the two ends of the transition part are respectively directed to the two sides of the rod. Taking the first rod 131 as an example, and with continued reference to fig. 2, the first rod 131 includes a transition portion 1313, and both ends of the transition portion 1313 are connected to the first bending portion 1311 and the second bending portion 1312, respectively. An inner normal direction corresponding to a portion where the first bending portion 1311 and the transition portion 1313 are connected is indicated by an arrow a, an inner normal direction corresponding to a portion where the second bending portion 1312 and the transition portion 1313 are connected is indicated by an arrow b, and the inner normal direction a and the inner normal direction b are respectively directed to both sides of the first rod 131. It should be noted that references to a transition in this specification should be understood to mean that the curvature of the rod is less than a threshold (e.g., 4mm threshold) -1 ) But can be approximately seen as a straight line portion.
As can be seen from fig. 1, the positions of the bent portions, the curvatures of the bent portions, and the positions of the transition portions of the first rod 131, the second rod 132, and the third rod 133 are different, and the intervals between the adjacent two rods in the circumferential direction of the vibration member 120 are also different. Through the asymmetric arrangement of the three rods, the problem that the magnetic circuit system connected with the vibrating piece 120 collides in the shell and generates abnormal sound when shaking is effectively solved. Furthermore, the three rod members are provided with the bending portions, so that the size of the vibration transmission plate 100 (for example, the size in the X direction shown in fig. 1) can be reduced, the vibration transmission plate 100 can be better installed in a narrow space in the housing, and the rod members can be circuitous in a limited space due to the arrangement of the bending portions, so that the elastic coefficient of the rod members in the X direction can be reduced, the impact of the load on the vibration member 100 in the direction can be reduced, and the risk of breakage of the rod members can be reduced. Further description of the provision of bends to reduce the risk of rod breakage may be found elsewhere in this specification and will not be described in detail here.
It should be noted that the number of the rods, the number of the bent portions in the first rod 131, and the number of the transition portions in fig. 1 are only for exemplary description, and are not limited thereto. In some embodiments, the number of the rod members in the vibration-transmitting plate 100 may also be three or more, for example, the vibration-transmitting plate may further include a fourth rod member, a fifth rod member, or the like. In some embodiments, the first rod 131 may further include a third bend, a fourth bend, and the like.
In some embodiments, the vibration plate 100 may be applied to a bone conduction headset and a roll test may be performed to verify the structural reliability of the vibration plate 100 and further improve the design of the vibration plate 100 on the basis thereof. In some embodiments, failure modes of the vibration transfer plate 100 include: (1) as shown in fig. 3A, the bent portion of the third pin 133 (i.e., at the position T) is broken; (2) as shown in fig. 3B, the connection of the third rod 133 and the ring structure 110 (i.e., at the position U) is broken; (3) the second pin 132 and the third pin 133 are plastically deformed. By counting the number of products and/or samples corresponding to each failure mode, it can be found that the vibration transfer plate 100 with the breakage at the bent portion of the third rod 133 is the largest (i.e., the primary failure mode), and the vibration transfer plate 100 with the breakage at the connection of the third rod 133 and the annular structure 110 is the second failure mode, and a small number of vibration transfer plates 100 are subjected to plastic deformation of the second rod 132 and the third rod 133. It follows that the third rod 133 is a dangerous rod most likely to cause failure of the vibration transmission plate 100.
In some further embodiments, the load applied to the vibration transmission plate 100 during operation may be divided into a load along the length direction of the hollow area, a load along the width direction of the hollow area, an axial load (i.e., a load in a direction perpendicular to the plane of the vibration member 120), and a flipping load (a load that flips the vibration transmission plate 100 around the length direction of the hollow area) according to directions. By performing unidirectional load fatigue simulation on the vibration transmission piece 100, the distribution of stress and fatigue failure cycle times of the vibration transmission piece 100 under the load in each direction can be studied, so that the main cause of breakage of the vibration transmission piece 100 is judged, and the improvement and optimization of the vibration transmission piece 100 are facilitated.
Fig. 4A-4D are schematic stress distributions of the vibration transfer plate 100 under load along the length of the hollowed-out region, load along the width of the hollowed-out region, axial load, and overturning load, respectively. Fig. 5A-5D are graphs illustrating the distribution of the number of fatigue failures of the vibration transfer plate 100 under load along the length of the hollowed-out region, load along the width of the hollowed-out region, axial load, and upset load. As shown in fig. 4A, when the vibration transmission plate 100 is subjected to a load in the length direction of the hollow area, stress is concentrated and distributed at the bent portion of the third bar 133. As shown in fig. 5A and 5D, the bending portion of the third rod 133 causes the vibration plate to have a minimum number of fatigue failure cycles when the vibration plate 100 is subjected to a rollover load. It follows that the load along the length of the hollowed-out region, as well as the overturning load, is the primary cause of the primary failure mode of the vibration transfer plate 100 (i.e., the breakage of the bent portion of the third rod 133). In some embodiments, to reduce the impact of the load on the vibration transfer plate 100 along the length of the hollowed-out area, the elastic modulus of each rod in the vibration transfer plate 100 along the length of the hollowed-out area may be reduced.
In some embodiments, according to the stress calculation formula (i.e., the stress is equal to the load divided by the cross-sectional area of the rod), the purpose of reducing the impact stress on the rod can be achieved by increasing the cross-sectional area of the rod, so as to improve the impact resistance of the vibration transmission plate, and thus improve the service life of the vibration transmission plate. In some embodiments, increasing the rod cross-sectional area may be achieved by increasing the width or thickness of the rod. For example, the thickness of the rod and the thickness of the vibrating member may be set to be uniform, and the sectional area of the rod may be increased by increasing the width of the rod. The cross-sectional area of a bar is understood to be the area of the cross-section of the bar perpendicular to its direction of extension. The width of a bar is then understood to be the dimension of the bar perpendicular to its direction of extension.
In some embodiments, the increase in the spring rate may cause the vibration plate to be impacted by a load along the length of the hollowed-out region due to the change (i.e., increase) in the spring rate of the vibration plate (e.g., spring rate along the length of the hollowed-out region, spring rate in the flip direction) caused by the increase in the width of the rod. Therefore, in improving the vibration plate 100, the relationship between the width of the rod and the elastic coefficient of the vibration plate should be considered in combination, so that the elastic coefficient of the vibration plate (for example, the elastic coefficient in the length direction of the hollow area) is reduced more than the increase of the width of the rod, so that the stress can be reduced as a whole.
In some embodiments, through simulation experiments on the vibration-damping sheet 100, the influence of the change of the width of the rod on the elastic coefficient of the vibration-damping sheet 100 (for example, the elastic coefficient along the length direction of the hollow-out area and the elastic coefficient in the turning direction) can be obtained, so as to obtain a better adjustment scheme for the width of the rod. Specifically, it can be realized by studying the elastic modulus of the vibration transmission plate in the length direction of the hollowed-out region and/or the elastic modulus in the inversion direction, the average stress at a section of the vibration transmission plate susceptible to fracture (for example, a section corresponding to the position T of the third bar 133 shown in fig. 3A, a section corresponding to the position U of the third bar shown in fig. 3B), and the relationship between the number of cycles of fatigue failure and the change in the width of the bar (for example, the third bar).
Fig. 6 is a graph showing the change in the elastic modulus of the vibration-transmitting plate along the length direction of the hollow region, the average stress of the cross section corresponding to the maximum curvature of the bent portion of the third bar, and the change in the width of the bar in accordance with some embodiments of the present disclosure. Fig. 7 is a graphical representation of the number of cycles to failure fatigue of a vibration plate under load along the length of a hollowed-out region, the change in the modulus of elasticity along the length of the hollowed-out region, as a function of the multiple of the change in the width of the rod, in accordance with some embodiments of the present description. Wherein, in fig. 6, curve 610 is the average stress of the corresponding cross section at the maximum curvature of the bend of the third bar as a function of the increase in the total width of the bars by a factor; curve 620 is the increase in the elastic modulus of the vibration-transmitting plate 100 along the length of the hollowed-out area as a function of the increase in the total width of the rod. In fig. 7, curve 710 is a graph of the number of cycles to fatigue failure of the vibration plate 100 under load along the length of the hollowed-out region versus the increase in the total width of the rod member by a factor of two; curve 720 is a plot of the increase in the elastic coefficient of the vibration plate 100 along the length of the hollowed-out region versus the increase in the total width of the rod by a factor of two.
As can be seen from fig. 6 and 7, when the vibration plate is subjected to a load in the longitudinal direction of the hollow region, the elastic coefficient of the vibration plate in the longitudinal direction of the hollow region decreases as the rod width decreases, the average stress of the cross section corresponding to the maximum curvature of the bent portion of the third rod 133 decreases, and the number of cycles of fatigue failure caused by the load in the longitudinal direction of the hollow region increases. As can be seen from fig. 7, the number of cycles of fatigue failure caused by the load in the length direction of the hollowed-out region is significantly increased after the width of the rod is reduced by 20%, that is, the fatigue life of the vibration transmission plate is significantly increased.
Fig. 8 is a graph showing a relationship between a change in the elastic modulus of the vibration-transmitting plate in the flip direction, an average stress of a cross section corresponding to a connection of the third rod and the ring structure, and a change multiple of the width of the rod according to some embodiments of the present disclosure. Fig. 9 is a graphical representation of the number of cycles to failure under load in the flip direction, spring rate in the flip direction, and the multiple of the width change of the bar for a vibration plate according to some embodiments of the present disclosure. In fig. 8, a curve 810 is a relationship curve of the average stress of a cross section corresponding to the connection position of the third rod and the annular structure and the total width increase multiple of the rod; curve 820 is the increase in the modulus of elasticity of the vibration-transmitting plate in the flip direction versus the increase in the total width of the rod member by a factor of two. In fig. 9, curve 910 is a graph of the number of cycles of fatigue failure of the vibration-transmitting plate 100 under a load in the flip direction versus the increase in the total width of the rod member by a factor; curve 920 is a plot of the increase in the spring rate of the vibration plate 100 in the flip direction versus the increase in the total width of the rod member by a factor of two.
As shown in fig. 8 and 9, when the vibration transmission plate is subjected to a load in the turning direction, the elastic coefficient of the vibration transmission plate in the turning direction decreases as the width of the rod member decreases, the average stress of the cross section corresponding to the connection portion of the third rod member 133 and the ring structure 110 decreases, and the number of cycles of fatigue failure caused by the load in the turning direction increases first and then decreases as the width of the rod member decreases. In some embodiments, the number of cycles of fatigue failure caused by the load in the flip direction is maximized when the rod width is reduced by 20%, which can better improve the fatigue life of the vibration transmitting plate.
In some embodiments, as can be seen from fig. 6 and 7, and fig. 8 and 9, when the improvement is made based on the vibration transmission plate 100, it is advantageous to increase the fatigue life of the vibration transmission plate by appropriately reducing the width of the rod member (for example, by 20%). In some embodiments, the rod width may be between 0.2mm and 1 mm. Preferably, the bar width may be between 0.25mm and 0.5 mm. The width of the bar may be between 0.3mm and 0.4 mm. The thickness of the bar is generally constant to facilitate processing of the bar, and in some embodiments, the ratio of the width of the bar to the thickness of the bar is not less than 1.
In some embodiments, the elastic coefficient of the rod in the length direction of the hollow area can be reduced by adjusting the number of the rods, the number and/or curvature of the bent portions of the rods, the length and/or width of the rods and the like, so that the impact of the load on the vibration transmission plate in the length direction of the hollow area is reduced, and the fatigue resistance of the vibration transmission plate is improved.
In some embodiments, in the vibration transfer plate 100, in order to ensure that each bar has a sufficient length to form a bending portion for the purpose of reducing the elastic coefficient in the length direction of the hollowed-out region 140, the length of each bar may be greater than 50% of the maximum dimension D1 of the hollowed-out region along the length direction thereof. In some embodiments, to ensure that the rod has a sufficient length to form a plurality of bends to increase the number of turns of the rod, and further reduce the elastic coefficient of the vibration-transmitting plate in the length direction of the hollow area 140, the length of each rod may be greater than 65% of the maximum dimension of the hollow area 140 in the length direction. In some embodiments, in order to ensure the sound quality of the bone conduction earphone and to reduce the elastic coefficient of the vibration plate 100 in the length direction of the hollow area 140, the length of each rod may be greater than 75% of the maximum size of the hollow area along the length direction.
In order to ensure that the hollow area 140 has sufficient space to accommodate the vibrating element 120 and the respective rods (i.e., the first rod 131, the second rod 132, and the third rod 133), and to ensure that the vibrating piece can be adapted to the narrow space in the core of the bone conduction earphone, in some embodiments, the maximum dimension D1 of the hollow area 140 along the length direction thereof may be 8-20mm, and the maximum dimension D2 along the width direction thereof may be 3-8 mm. In some embodiments, the maximum dimension D1 of the hollowed-out area 140 along its length direction can be 8-15mm, and the maximum dimension D2 along its width direction can be 3-6 mm. In some embodiments, the maximum dimension D1 of the hollowed-out area 140 along its length may be 8-12mm and the maximum dimension D2 along its width may be 3-6 mm.
In order to ensure that the vibration plate 100 has better overall structural strength, and ensure that the hollow area 140 can provide sufficient space for the circuitous path of each rod (i.e., the first rod 131, the second rod 132 and the third rod 133), and ensure that the bending part of each rod can keep a certain distance from the annular structure, the vibration plate is prevented from colliding with the annular structure when the bending part of each rod shakes along the width direction of the hollow area during operation, thereby reducing the fatigue resistance of the rod. In some embodiments, the ratio of the maximum dimension D1 of the hollowed-out area 140 along its length direction to the maximum dimension D2 along its width direction may be 1.5-3. In some embodiments, the ratio of the maximum dimension D1 of the hollowed-out area 140 along its length direction to the maximum dimension D2 along its width direction may be 1.5-2.5. In some embodiments, the ratio of the maximum dimension D1 of the hollowed-out area 140 along its length direction to the maximum dimension D2 along its width direction may be 1.5-3.
In some embodiments, the rods of the vibration-transmitting sheet 100 have a fiber structure. The fiber structure has multiple layers of fibers, when the direction of the force applied to the rod piece is parallel to the extending direction of the fibers or has a smaller included angle, the fiber body of the fiber structure is stressed, the bearing capacity of the rod piece is stronger, and the breakage is not easy to occur. When the direction of the force applied to the rod is perpendicular to the extending direction of the fibers or has a larger included angle, the force is applied to the bonding interface between the fibers of the plurality of layers, and the bearing capacity of the rod is greatly reduced, so that the fibers are possibly separated, and the rod is broken. Thus, in some embodiments, the structure of the vibration-transmitting sheet may be such that the angle between the tangent to the region of maximum curvature of at least one of the rods and the direction of extension of the fibrous structure is from 0 ° to 30 °. Through setting up like this, can make the vibration transmission piece receive the power (for example, the impact of load on the length direction of the fretwork region of vibration transmission piece) at the during operation member, for the fibre body in the fibrous structure of member comes the atress to this improves the bearing capacity of member, reduces the cracked risk of member. Taking the third rod 133 as an example, referring to fig. 10, the tangential direction of the position of the region where the curvature of the third rod 133 is the largest (i.e., the position where the bent portion of the third rod 133 is broken) is s1, the extending direction of the fiber structure is s2, and the included angle B4 of s1 and s2 is 0 ° to 30 °. This greatly improves the load bearing capacity of the bent portion of the third pin 133 and reduces the risk of breakage of the bent portion of the third pin 133.
In order to improve the structural stability of the vibration transmission plate and prevent the vibration transmission plate from shaking during operation, in some embodiments, the lengths of each rod member in the vibration transmission plate (e.g., vibration transmission plate 100) in the embodiments of the present disclosure may be different. The asymmetric three-rod structure is arranged relative to a symmetric structure (for example, a four-rod symmetric structure), so that the risk of shaking of the vibrating piece in the working process can be well reduced or avoided, the probability of abnormal sound caused by collision between a magnetic circuit system connected with the vibrating piece and a shell or a voice coil of the bone conduction earphone can be reduced or avoided, and the bone conduction earphone is ensured to have good tone quality. In addition, through setting up the length of passing each member in the vibration plate inequality, can reduce vibrating piece and member displacement volume (or being called elastic deformation) in the length direction of fretwork region to can reduce the impact that the load received on the length direction of vibration plate fretwork region, reduce the cracked risk of vibration plate (for example, each member) appearance.
In some embodiments, the parameters described above with respect to the vibration transfer plate 100 (the width of the rod, the length of the rod, the curvature of the bend, the ratio of the length of the rod to the maximum dimension of the hollowed-out region along the length direction, the ratio of the maximum dimension of the hollowed-out region along the length direction to the maximum dimension of the hollowed-out region along the width direction, etc.) may be applied to vibration transfer plates in other embodiments of the present disclosure (e.g., vibration transfer plate 200 shown in fig. 11, vibration transfer plate 300 shown in fig. 14, or vibration transfer plate 400 shown in fig. 15).
In some embodiments, the rod member may be caused to detour a plurality of times in the limited space formed between the ring structure and the vibrating member by increasing the number of bent portions of the rod member, so as to further reduce the elastic coefficient of the vibration transmitting plate in the length direction provided by the vibrating member.
Fig. 11 is a schematic diagram of a vibration plate according to some embodiments of the present disclosure. As shown in fig. 11, the vibration plate 200 includes a ring structure 210, a vibrating member 220, and a plurality of rod members. The middle region of the ring structure 210 has a hollow area 240. In some embodiments, the plurality of bars may include first, second, and third bars 231, 232, and 233, and the first, second, and third bars 231, 232, and 233 are spaced apart in the circumferential direction of the vibrating member. In some embodiments, the number of the bent portions of the plurality of bars (e.g., the first bar 231, the second bar 232, and the third bar 233) may also be different. For example, the number of the bent portions in the first rod 231 may be two, the number of the bent portions in the second rod 232 may be four, and the number of the bent portions in the third rod 233 may be four. In some embodiments, the number of the bent portions of the plurality of bars (e.g., the first bar 231, the second bar 232, and the third bar 233) may be the same. For example, the number of the bent portions in the first bar 231, the second bar 232, and the third bar 233 may be two, three, or four, among other numbers. For example, by providing a plurality of bending portions on each rod, the length of the rod can be increased, so as to effectively reduce the lower elastic coefficient of the rod in the length direction of the hollow area, thereby reducing the impact of the load on the vibration damping sheet 200 in the length direction of the hollow area. The specific structure of each rod will be described in detail below with reference to the accompanying drawings. The ring structure 210, the vibrating member 220, the hollow area 240, and the first rod 231 of the vibration plate 200 are similar to the ring structure 110, the vibrating member 220, the hollow area 140, and the first rod 131 of the vibration plate 100, and further description of the ring structure 210, the vibrating member 220, the hollow area 240, and the first rod 231, such as size and shape, can be referred to the related description of the vibration plate 100.
Fig. 12 is a schematic structural view of a second rod according to some embodiments of the present disclosure. Referring to fig. 11 and 12, one end of the second pin 232 is connected to the inside of the ring structure 210, and the other end of the second pin 232 is connected to the vibration member 220. In some embodiments, the second rod 232 may include a bend 2321, a bend 2322, a bend 2323, and a bend 2324 distributed in sequence along the shaft of the second rod 232. In some embodiments, the centers of curvature for the different bends may be on opposite sides of the second stem 232. The two sides of the second pin 232 refer to two sides along the extending direction of the second pin 232 from the ring structure 210 to the vibrating member 220. For example, the center of curvature C of the bent portion 2321 and the center of curvature D of the bent portion 2322 shown in fig. 12 are located at both sides of the second rod 232, respectively. For another example, the center of curvature D of the curved portion 2322 and the center of curvature F of the curved portion 2324 are located on both sides of the second rod 232 (fourth curved portion 2324). For another example, the center of curvature E of the curved portion 2323 and the center of curvature F of the curved portion 2324 are located on both sides of the second rod 232 (the transition 2326), respectively. In some embodiments, the center of curvature of the portion of the bend in the second stem 232 may also be on the same side of the second stem 232. For example, the center of curvature D of the curved portion 2322 and the center of curvature E of the curved portion 2323 are located on the same side of the second rod member 232.
In some embodiments, the second rod 232 may further include a transition 2325 and a transition 2326. The transition portion 2325 has both ends connected to the curved portion 2321 and the curved portion 2322, respectively, and the transition portion 2326 has both ends connected to the curved portion 2323 and the curved portion 2324, respectively. An inner normal direction corresponding to the connection portion of the bending portion 2321 and the transition portion 2325 is indicated by an arrow c, an inner normal direction corresponding to the connection portion of the bending portion 2322 and the transition portion 2325 is indicated by an arrow d, an inner normal direction corresponding to the connection portion of one end of the transition portion 2126 and the bending portion 2323 is indicated by an arrow e, an inner normal direction corresponding to the connection portion of the other end of the transition portion 2326 and the bending portion 2324 is indicated by an arrow f, and the inner normal direction c and the inner normal direction d respectively point to two sides of the second rod 232. The inner normal direction e and the inner normal direction f are directed to both sides of the second rod 232, respectively. In some embodiments, the second rod 232 further includes a transition portion 2327, and both ends of the transition portion 2327 are connected to the bending portion 2322 and the bending portion 2323, respectively. An inner normal direction corresponding to the connection portion of the curved portion 2322 and the transition portion 2327 is indicated by an arrow m, and an inner normal direction corresponding to the connection portion of the curved portion 2323 and the transition portion 2327 is indicated by an arrow n. In some embodiments, the inner normal directions m and n may both point to the same side of the second rod 232.
Fig. 13 is a schematic structural view of a third rod according to some embodiments of the present disclosure. Referring to fig. 11 and 13, one end of the third pin 233 is connected to the ring structure 210, and the other end of the third pin 233 is connected to the vibration member 220. In some embodiments, the third rod member 233 includes a bent portion 2331, a bent portion 2332, a bent portion 2333, and a bent portion 2334, which are sequentially distributed along the shaft of the third rod member 233. The center of curvature G of the curved portion 2331 and the center of curvature H of the curved portion 2332 are located on both sides of the third rod 233 (transition portion 2335), respectively. A curvature center H of the bent portion 2332 and a curvature center J of the bent portion 2334 are positioned at both sides of the third rod member 233 (the bent portion 2334), respectively. The center of curvature I of the bent portion 2333 and the center of curvature J of the bent portion 2334 are located on both sides of the third rod member 233 (transition portion 2336), respectively. In some embodiments, the center of curvature H of the bent portion 2332 and the center of curvature I of the bent portion 2333 may be located on the same side of the third stem 233.
In some embodiments, the third stem 233 further comprises a transition 2335 and a transition 2336. The third rod piece transition portion 2335 has both ends connected to the bending portion 2331 and the bending portion 2332, respectively, and the transition portion 2336 has both ends connected to the bending portion 2333 and the bending portion 2334, respectively. The inner normal direction of the curved portion 2331 corresponding to the connecting portion of the transition portion 2335 is indicated by arrow g, the inner normal direction of the curved portion 2332 corresponding to the connecting portion of the transition portion 2335 is indicated by arrow h, the inner normal direction of the curved portion 2333 corresponding to the connecting portion of the transition portion 2336 is indicated by arrow i, and the inner normal direction of the curved portion 2334 corresponding to the connecting portion of the transition portion 2336 is indicated by arrow j. Wherein the inner normal direction g and the inner normal direction h are directed to both sides of the third bar 233, respectively. The inner normal direction i and the inner normal direction j are directed to both sides of the third bar 233, respectively. In some embodiments, the third stem 233 further comprises a transition portion 2337, and both ends of the transition portion 2337 are connected with the bent portion 2332 and the bent portion 2333, respectively. The inner normal direction of the bent portion 2332 corresponding to the connecting portion of the transition portion 2337 is indicated by arrow q, and the inner normal direction of the bent portion 2333 corresponding to the connecting portion of the transition portion 2337 is indicated by arrow r. In some embodiments, the inner normal direction q and the inner normal direction r may be directed to the same side of the second pin 233 at the same time.
In some embodiments, the length of the rod may be increased by providing one or more bending portions having a curvature satisfying a condition to effectively reduce a lower elastic coefficient of the rod in a length direction of the hollow region, and the first rod 231, the second rod 232, and the third rod 233 may include at least one bending portion having a curvature of 2 to 10. For example, the first rod 131, the second rod 132, and the third rod 133 may include at least one bent portion having a curvature of 4-10. For another example, the first rod 131, the second rod 132 and the third rod 133 may include at least one bending portion having a curvature of 6-10, and the bending degree of the bending portion is greater when the curvature of the bending portion is greater, so that the number of bending portions of the rod may be increased in a case where a space is limited, and thus the elastic coefficient of the rod in the length direction of the hollow area may be better reduced. For example, the curvature of at least one of the curved portions 2321, 2322, 2323 and 2324 of the second rod 232 may be 2 to 10. Also, for example, at least one of the bent portions 2331, 2332, 2333, and 2334 of the third stem 233 may have a curvature of 2-10.
In order to ensure that the first rod 231, the second rod 232 and the third rod 233 have sufficient lengths to form corresponding bending portions, so as to reduce the elastic coefficient of the vibration transmission plate 200 in the length direction of the hollow area, and ensure that each rod is disposed in the hollow area 240 with limited space, in some embodiments, the ratio of the length of the first rod 231 to the maximum dimension (D3 shown in fig. 11) of the hollow area along the length direction thereof is 75% to 85%; the ratio of the length of the second rod 232 to the maximum size of the hollow area 240 along the length direction thereof is 85% -96%; the ratio of the length of the third rod 233 to the maximum dimension of the hollow area 240 along the length direction thereof is 70% to 80%. In some embodiments, the ratio of the length of the first rod 231 to the maximum dimension of the hollow area 240 along the length direction thereof is 75% to 83%; the ratio of the length of the second rod 232 to the maximum size of the hollow area 240 along the length direction thereof is 85% -94%; the ratio of the length of the third bar 233 to the maximum dimension of the hollow area 240 along the length direction thereof is 70-87%. In some embodiments, the ratio of the length of the first rod 231 to the maximum dimension of the hollow area 240 along the length direction thereof is 75% to 80%; the ratio of the length of the second rod 232 to the maximum size of the hollow area 240 along the length direction thereof is 85% -90%; the ratio of the length of the third bar 233 to the maximum dimension of the hollow area 240 along the length direction thereof is 70-82%. By way of example only, in some embodiments, the maximum dimension D3 of the vibration transmissive sheet 200's hollowed-out area 240 along its length may be 15.05 mm; the maximum dimension D4 of the hollowed-out area 240 of the vibration-transmitting sheet 200 in the width direction thereof may be 5.65 mm; the length of the first pin 231 may be 12.37 mm; the length of the second rod 232 may be 14.08 mm; the length of the third pin 233 may be 11.75 mm. It should be noted that, here, the lengths of the first rod 231, the second rod 232 and the third rod 233 refer to the linear lengths after stretching and unfolding.
In some embodiments, as shown in fig. 11, the contact point P1 of the first pin 231 and the vibrating element 220 has a first connection line with the center point O of the vibrating element, the contact point P2 of the second pin 232 and the vibrating element 220 has a second connection line with the center point O of the vibrating element, and the contact point P3 of the third pin 233 and the vibrating element has a third connection line with the center point O of the vibrating element 220. An included angle B1 between the first connection line and the second connection line or an included angle B2 between the first connection line and the third connection line is greater than an included angle B3 between the second connection line and the third connection line. In some embodiments, when the shape of the vibration member 220 is a regular geometric shape, the center point O of the vibration member 220 is a geometric center of the vibration member 220. For example, when the vibration member 220 has a circular shape, the center point O may be the center of the circle. For another example, when the vibrator 220 has a rectangular shape, the center point O may be an intersection of two diagonal lines of the rectangular shape. In some embodiments, when the shape of the vibration member 220 is an irregular shape, the center of mass of the vibration member 220 may be regarded as the center point O of the vibration member 220.
In some embodiments, the angle B1 between the first line and the second line may be 100 ° -140 °; the included angle B2 between the first connecting line and the third connecting line can be 120-160 degrees; the angle B3 between the second line and the third line may be 70-100 °. In some embodiments, the first line may be at an angle B1 of 105 ° -130 ° to the second line; the included angle B2 between the first line and the third line can be 120-150 degrees; the angle B3 between the second line and the third line may be 70 ° to 90 °. In some embodiments, the angle B1 between the first line and the second line may be 100 ° -140 °; the included angle B2 between the first connecting line and the third connecting line can be 120-160 degrees; the angle B3 between the second line and the third line may be 75 ° to 90 °. In some embodiments, the angle B1 between the first line and the second line may be 110-125 °; the included angle B2 between the first line and the third line can be 120-145 degrees; the angle B3 between the second line and the third line may be 75-85 °. In some embodiments, the angle B1 between the first line and the second line may be 115 ° -120 °; the included angle B2 between the first line and the third line can be 125-140 degrees; the angle B3 between the second line and the third line may be 75 ° to 80 °.
By way of example only, in some embodiments, the angle B1 between the first line and the second line may be 128 °, the angle B2 between the first line and the third line may be 145 °, and the angle B3 between the second line and the third line may be 87 °. As an example, the hollow area of the ring structure 210 is a racetrack structure, the vibrating element 220 is a structure similar to a rectangle, the upper and lower sides of the vibrating element 220 shown in fig. 11 have portions protruding outward, and in order to ensure that each rod has a larger length, the included angles (e.g., included angles B1, B2, and B3) formed between two adjacent rods are different, so as to ensure that the rods can be located in a larger space between the ring structure 210 and the vibrating element 220, e.g., the hollow areas on the left and right sides of the vibrating element 220 shown in fig. 11, so that the rods can have a plurality of bending portions, thereby further increasing the length of the rods, reducing the elastic coefficient of the rods in the length direction of the hollow areas, reducing the impact of the load on the vibrating element 200 in the length direction of the hollow areas, and increasing the service life of the vibrating element.
In some embodiments, the cross-sectional area of the bars (i.e., the first bar 231, the second bar 232, and the third bar 233) in the vibration transfer plate 200 can be increased by increasing the width of the bars, so as to reduce the stress in the bars and improve the impact resistance of the vibration transfer plate 200.
In order to ensure that the rods have a large cross-sectional area, effectively resist impact load, reduce impact internal stress, and improve the impact resistance of the vibration transfer plates, in some embodiments, the width of each rod in the vibration transfer plates 200 may be greater than 0.25 mm. In some embodiments, the width of each bar in the vibration plate 200 may be greater than 0.28 mm. In some embodiments, the width of each bar in the vibration plate 200 may be greater than 0.3 mm.
Fig. 14 is a schematic diagram of a vibration plate according to some embodiments of the present disclosure.
In some embodiments, the vibration plate provided in the embodiments of the present disclosure may also be a vibration plate 300 as shown in fig. 14. The vibration plate 300 shown in fig. 14 has substantially the same overall structure as the vibration plate 100 shown in fig. 1, except that the third rod 333 shown in fig. 14 has a different structure from the third rod 133 shown in fig. 1. For further description of the ring structure 310, the vibrating element 320, the hollow area 340, and the first rod 331 and the second rod 332 shown in fig. 14, reference may be made to the ring structure 110, the vibrating element 120, the hollow area 140, and the related descriptions of the first rod 131 and the second rod 132 shown in fig. 1, which are not repeated herein. The structure of the third rod 333 shown in fig. 15 will be described in detail with reference to the accompanying drawings.
Fig. 15 is a schematic structural view of a third rod according to some embodiments of the present disclosure.
As shown in fig. 15, the third rod 333 includes a bent portion 3331, a bent portion 3332, a bent portion 3333, and a bent portion 3334, which are sequentially distributed along the shaft of the third rod 333. In some embodiments, the centers of curvature of two adjacent curved portions in the third link 333 correspond to both sides of the third link 333. Wherein, a curvature center L of the bent portion 3331 and a curvature center V of the bent portion 3332 are respectively located at both sides of the third rod 333. A curvature center V of the bent portion 3332 and a curvature center W of the bent portion 3333 are respectively located at both sides of the third rod 333. A curvature center W of the bent portion 3333 and a curvature center Z of the bent portion 3334 are respectively located at both sides of the third rod 333.
In some embodiments, the third rod 333 further includes a transition 3335, a transition 3336, and a transition 3337. The transition portion 3335 has both ends connected to the bending portion 3331 and the bending portion 3332, the transition portion 2336 has both ends connected to the bending portion 3332 and the bending portion 3333, and the transition portion 3337 has both ends connected to the bending portion 3333 and the bending portion 3334. The inner normal direction corresponding to the connection portion between the bent portion 3331 and the transition portion 3335 is indicated by an arrow l, the inner normal direction corresponding to the connection portion between the bent portion 3332 and the transition portion 3335 is indicated by an arrow v1, the inner normal direction corresponding to the connection portion between the bent portion 3332 and the transition portion 3336 is indicated by an arrow v2, the inner normal direction corresponding to the connection portion between the bent portion 3333 and the transition portion 3336 is indicated by an arrow w1, the inner normal direction corresponding to the connection portion between the bent portion 3333 and the transition portion 3337 is indicated by an arrow w2, and the inner normal direction corresponding to the connection portion between the bent portion 3334 and the transition portion 3337 is indicated by an arrow z. Wherein, the inner normal direction l and the inner normal direction v1 point to both sides of the third rod 333, respectively. The inner normal direction v2 and the inner normal direction w1 are directed to both sides of the third link 333, respectively. The inner normal direction w2 and the inner normal direction z are directed to both sides of the third rod 333, respectively.
In some embodiments, the vibration transfer plate 300 has a higher number of fatigue failure cycles under load along the length of the hollowed-out region and under upset load, with a higher fatigue life.
Fig. 16 is a schematic diagram of a vibration plate according to some embodiments of the present disclosure.
As shown in fig. 16, the vibration transmitting plate 400 may include a ring structure 410, a vibrating member 420, and a first rod 431, a second rod 432, a third rod 433, and a fourth rod 444 for connecting the ring structure 410 and the vibrating member 420. The first rod 431, the second rod 432, the third rod 433 and the fourth rod 434 have the same structure. Specifically, the lengths and widths of the first rod 431, the second rod 432, the third rod 433, and the fourth rod 434, the number of bent portions, the curvature of the bent portions, and the like are all the same. Taking the first rod 431 as an example, the first rod 431 has a plurality of bending portions, wherein the curvature centers of two adjacent bending portions are located at two sides of the first rod 431. The length of the rod member can be increased by arranging the plurality of bending portions on the rod member, so that the elastic coefficient of the rod member is reduced, the impact of the load in the length direction of the hollow area in the vibration transmission member 400 is reduced, and the service life of the vibration transmission member 400 is prolonged. The number of the bent portions of the first rod 431 may be two, three, four, or more, and the curvature of each bent portion may be the same or different. In some embodiments, in order to avoid the vibration element 420 from being unbalanced and turned in the axial direction (the direction perpendicular to the plane of the vibration element 420) as much as possible, the first rods 431, the second rods 432, the third rods 433 and the fourth rods 434 are symmetrically distributed with respect to the vibration element 420, that is, the first rods 431, the second rods 432, the third rods 433, the fourth rods 434 and the vibration element 420 form a structure which is symmetrical up and down and left and right. The elastic coefficient of the vibration transmission plate 400 in the length direction of the hollow area and the elastic coefficient in the turning direction are low, which is beneficial to improving the fatigue resistance of the vibration transmission plate.
In some embodiments, the plurality of rods may provide the vibrating member with an elastic coefficient along the length direction of the hollowed-out region (i.e., an elastic coefficient of the vibration transmitting sheet along the length direction of the hollowed-out region) of 50N/m to 70000N/m. The method for determining the elastic coefficient of the vibration transmission sheet along the length direction of the hollow area comprises the following steps: when a ring structure of a vibration transmitting piece (for example, the vibration transmitting piece shown in fig. 1, 11, 14 or 16) is fixed, a constant force Ft along the longitudinal direction of the hollow area is applied to the vibrating piece, and a displacement u of an arbitrary point (for example, a central point) on the vibrating piece along the longitudinal direction of the hollow area is determined, an elastic coefficient k of the vibration transmitting piece along the longitudinal direction of the hollow area is equal to Ft/u. So set up, can guarantee that magnetic circuit can not touch bone conduction headset's casing or voice coil loudspeaker voice coil along the length direction in fretwork region under the action of gravity, guarantee that bone conduction headset has better tone quality effect. In some embodiments, the plurality of rods may provide the vibrating member with an elastic coefficient in a length direction (i.e., an elastic coefficient of the vibration transmitting plate in a length direction of the hollowed-out region) of 7000N/m to 20000N/m. In some embodiments, the elastic coefficient of the vibration piece along the length direction (i.e. the elastic coefficient of the vibration transmission piece along the length direction of the hollow area) provided by the plurality of rod pieces can be 10000N/m-20000N/m, and the vibration transmission piece can be ensured to have better fatigue resistance. In some embodiments, the elastic coefficient of the plurality of rods along the length direction of the vibrating piece (or called the elastic coefficient of the vibrating piece along the length direction of the hollow area) provided by the vibrating piece can be 40000N/m-70000N/m, so that the vibrating piece has better impact resistance under the condition of ensuring the sound quality of the bone conduction earphone.
The elastic coefficient of the vibration-transmitting plate in the axial direction (the direction perpendicular to the plane of the vibration-transmitting plate) is related to the sound quality of the bone-conduction earphone, and in order to improve the sound quality of the bone-conduction earphone and the sensitivity of the bone-conduction earphone at low frequency, in some embodiments, the rod member provides the vibration-transmitting plate with an axial elastic coefficient in the range of (2 pi f) 0 ) 2 m, where m is the magnetic circuit mass in the bone conduction earphone, and f0 is the resonant frequency of the bone conduction earphone at low frequencies. In some embodiments, the vibration plate in the embodiments of the present specification has a vibration frequency response curve having a resonance peak in a frequency range of 50Hz to 2000Hz when vibrating in a direction perpendicular to a plane thereof. The resonance peak can make the vibration transmission piece have a nearly flat trend in the vibration frequency response curve outside the resonance peak in the frequency range of 50Hz-2000Hz, thus ensuring that the corresponding bone conduction earphone has better tone quality. In addition, the resonance peak can ensure that the corresponding bone conduction earphone has better flexibility in the frequency range of 50Hz-2000HzAnd (4) sensitivity.
In some embodiments, the connection points of the plurality of rods and the vibrating member or the annular structure may be rounded. The round corners herein refer to round corners formed at the junctions of the rod members with the vibrating member or the ring-shaped structure at both sides in the width direction thereof. In some embodiments, the rounded corners formed at the connection of the rod member and the vibration member or the ring structure at both sides in the width direction thereof may include a first rounded corner and a second rounded corner. For example, the angle formed by the rod member and the vibrating member on one side in the width direction thereof is a first rounded angle, and the angle formed by the rod member on the other side in the width direction thereof is a second rounded angle. In some embodiments, the first rounded corner may be the same or different than the second rounded corner. Through the setting of fillet, can avoid stress concentration in member and vibrating part or annular structure's junction, reduce the cracked risk of junction emergence. In some embodiments, by setting the fillet radius to be smaller, the elastic coefficient of the vibration transmission sheet in the length direction of the hollow area can be reduced, and the fatigue resistance of the vibration transmission sheet can be improved. In some embodiments, since the fillet is too small, the number of fatigue failure cycles of the vibration transmission plate under the load along the length direction of the hollow area is low, and therefore, when designing the fillet radius, the relationship between the elastic coefficient of the vibration transmission plate along the length direction of the hollow area and the number of failure cycles of the vibration transmission plate under the load along the length direction of the hollow area and the fillet radius needs to be balanced. In some embodiments, the first fillet may have a fillet radius of 0.2mm to 0.7mm and the second fillet may have a fillet radius of 0.1mm to 0.3 mm. Preferably, the first rounded corner may have a corner radius of 0.3mm to 0.6mm, and the second rounded corner may have a corner radius of 0.15mm to 0.25 mm. As a specific example only, the first fillet may have a fillet radius of 0.4mm and the second fillet may have a fillet radius of 0.2 mm. By arranging the round angle, the elastic coefficient of the vibration transmission piece along the length direction of the hollowed-out area is relatively low, and the fatigue failure cycle times under the load along the length direction of the hollowed-out area are relatively high.
In some embodiments, in order to reduce the occurrence of imbalance and even turnover when the vibration plate vibrates along the direction perpendicular to the plane of the vibration plate, the position, the length and the number of bending parts of each rod member can be adjusted to balance the moments of each rod member acting on the vibration member. By this arrangement, when the vibrating member vibrates in the direction perpendicular to the plane thereof, the difference between the maximum value of the displacement of the surface of the vibrating member and the minimum value of the displacement of the surface of the vibrating member in the direction perpendicular to the plane thereof is less than 0.3 mm. As can be seen from the above (for example, fig. 5D and the related description thereof), the overturning load is also one of the reasons causing the failure of the vibration transmission plate (for example, the bending portion of the third rod 113 is broken), that is, the vibration member is prevented from overturning or being slightly overturned, so that the overturning load can be reduced or prevented, and the vibration transmission plate is in a more balanced state during operation (i.e., the moments of the respective rods acting on the vibration member are balanced), so as to reduce the risk of the breakage of the vibration transmission plate under the overturning load. In addition, the vibration transmission plates (e.g., the vibration transmission plate 100 shown in fig. 1, the vibration transmission plate 200 shown in fig. 11, and the vibration transmission plate 300 shown in fig. 14) of different lengths and asymmetric multiple rods have high stability in the length direction and the width of the hollow area, so that the vibration of the vibration member can be reduced or avoided, while the vibration transmission plates (e.g., the vibration transmission plate 400 shown in fig. 16) symmetrically arranged on the multiple rods are easy to shake in the width direction of the hollow area, and the magnetic circuit system connected with the vibration transmission plates can collide with the housing or the voice coil. Therefore, the vibration transmission pieces with different lengths and asymmetric multiple rod pieces can prevent the magnetic circuit system from shaking together and colliding with the shell or the voice coil of the bone conduction earphone to generate abnormal sound, and the bone conduction earphone is guaranteed to have better tone quality.
Fig. 17 is an overall schematic diagram of a bone conduction headset according to some embodiments described herein. Fig. 18 is a cross-sectional view of a bone conduction headset according to some embodiments of the present description. As shown in fig. 17 and fig. 18, the embodiment of the present specification further provides a bone conduction headset 500. The bone conduction headset 500 includes a housing structure 510, a vibration plate 520, and a magnetic circuit structure 530. The vibration transfer plate 520 may be any one of the vibration transfer plates provided in any of the embodiments of the present disclosure (e.g., vibration transfer plates 100, 200, 300, or 400). In some embodiments, the housing structure 510 has a receiving space, and the vibration plate 520 and the magnetic circuit structure 330 are located in the receiving space. The ring-shaped structure 521 of the vibration transmitting plate 520 is circumferentially connected to the inner wall of the case structure 510, and the magnetic structure 530 is connected to the vibrating member 522 of the vibration transmitting plate 520. Further, the magnetic structure 530 is attached to the lower surface of the vibration member 522, and when the magnetic structure 330 vibrates, the vibration can be transmitted to the case structure 510 through the vibration transmitting plate 520, and finally, to the auditory nerve of the user, so that the user hears the sound. In some embodiments, the lower surface of the vibration member 522 is provided with a connecting member 523, and the connecting member 523 and the magnetic circuit structure 530 can be fixedly connected through a bolt 524 and a nut 525, so as to achieve connection between the vibration member 522 and the magnetic circuit structure 530. Bone conduction headset 500 can avoid influencing customer's use experience or leading to the condition that the customer returned the product because of passing the piece fracture and shaking under the condition that guarantees to have better tone quality through the piece that passes that any embodiment of this description provided, has reduced the loss that brings because of the customer returns the product.
Having thus described the basic concept, it will be apparent to those skilled in the art that the foregoing detailed disclosure is to be regarded as illustrative only and not as limiting the present specification. Various modifications, improvements and adaptations to the present description may occur to those skilled in the art, although not explicitly described herein. Such alterations, modifications, and improvements are intended to be suggested in this specification, and are intended to be within the spirit and scope of the exemplary embodiments of this specification.
Also, the description uses specific words to describe embodiments of the description. Reference to "one embodiment," "an embodiment," and/or "some embodiments" means a feature, structure, or characteristic described in connection with at least one embodiment of the specification. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, some features, structures, or characteristics of one or more embodiments of the specification may be combined as appropriate.
Additionally, the order in which the elements and sequences of the process are recited in the specification, the use of alphanumeric characters, or other designations, is not intended to limit the order in which the processes and methods of the specification occur, unless otherwise specified in the claims. While various presently contemplated embodiments of the invention have been discussed in the foregoing disclosure by way of example, it is to be understood that such detail is solely for that purpose and that the appended claims are not limited to the disclosed embodiments, but, on the contrary, are intended to cover all modifications and equivalent arrangements that are within the spirit and scope of the embodiments herein. For example, although the system components described above may be implemented by hardware devices, they may also be implemented by software-only solutions, such as installing the described system on an existing server or mobile device.
Similarly, it should be noted that in the preceding description of embodiments of the present specification, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure aiding in the understanding of one or more of the embodiments. This method of disclosure, however, is not intended to imply that more features than are expressly recited in a claim. Indeed, the embodiments may be characterized as having less than all of the features of a single embodiment disclosed above.
Numerals describing the number of components, attributes, etc. are used in some embodiments, it being understood that such numerals used in the description of the embodiments are modified in some instances by the use of the modifier "about", "approximately" or "substantially". Unless otherwise indicated, "about", "approximately" or "substantially" indicates that the number allows a variation of ± 20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximations that may vary depending upon the desired properties of the individual embodiments. In some embodiments, the numerical parameter should take into account the specified significant digits and employ a general digit preserving approach. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the range are approximations, in the specific examples, such numerical values are set forth as precisely as possible within the scope of the application.
Finally, it should be understood that the embodiments described herein are merely illustrative of the principles of the embodiments of the present disclosure. Other variations are also possible within the scope of the present description. Thus, by way of example, and not limitation, alternative configurations of the embodiments of the specification can be considered consistent with the teachings of the specification. Accordingly, the embodiments of the present description are not limited to only those embodiments explicitly described and depicted herein.
Claims (10)
1. A vibration plate, comprising:
the middle area of the annular structure is a hollow area;
the vibrating piece is configured to be connected with the magnetic circuit system, and the vibrating piece is positioned in the hollow-out area of the annular structure; and
a plurality of rods configured to connect the ring-shaped structure and the vibrating member, the plurality of rods being spaced apart in a circumferential direction of the vibrating member; wherein at least one of the plurality of rods comprises at least two bends having centers of curvature on both sides of the at least one rod.
2. The vibration transfer plate of claim 1 wherein at least one of the plurality of rods includes at least three bends.
3. A vibration plate according to claim 1, wherein said rod members have a fiber structure, and a tangential direction of a position of a region of maximum curvature of said at least one rod member is at an angle of 0 ° to 30 ° to an extending direction of said fiber structure.
4. The vibration plate according to claim 1, wherein when the vibrating member vibrates in a direction perpendicular to a plane thereof, a difference between a maximum value of displacement of the surface of the vibrating member and a minimum value of displacement of the surface of the vibrating member in the direction perpendicular to the plane of the vibrating member is less than 0.3 mm.
5. The vibration plate according to claim 1, wherein the at least one rod member includes a plurality of transition portions, the inner normal direction of the portion connected to both ends of each of the transition portions is directed to both sides of the at least one rod member, respectively, and both ends of at least one of the transition portions are connected to the at least two bent portions of the at least one rod member.
6. The vibration transfer sheet of claim 1, wherein the hollowed-out region has a length direction and a width direction, wherein the length of each rod is greater than 50% of the maximum dimension of the hollowed-out region along the length direction, and wherein the length of each rod is different.
7. The vibration plate according to claim 6, wherein the plurality of the rod members include a first rod member, a second rod member, and a third rod member, and the first rod member, the second rod member, and the third rod member are sequentially spaced in a circumferential direction of the vibrating member; the ratio of the length of the first rod piece to the maximum size of the hollow-out area along the length direction of the first rod piece is 75% -85%; the ratio of the length of the second rod piece to the maximum size of the hollow area along the length direction of the second rod piece is 85% -96%; the ratio of the length of the third rod piece to the maximum size of the hollow-out area along the length direction of the third rod piece is 70% -80%.
8. The vibration plate according to claim 7, wherein a contact point of the first pin and the vibrating member has a first connection line with a center point of the vibrating member, a contact point of the second pin and the vibrating member has a second connection line with the center point of the vibrating member, a contact point of the third pin and the vibrating member has a third connection line with the center point of the vibrating member, and an angle between the first connection line and the second connection line or the third connection line is larger than an angle between the second connection line and the third connection line; wherein the included angle between the first connecting line and the second connecting line is 100-140 degrees, the included angle between the second connecting line and the third connecting line is 70-100 degrees, and the included angle between the first connecting line and the third connecting line is 120-160 degrees.
9. The vibration plate according to claim 1, wherein the joints of the plurality of rod members and the vibrating member or the ring structure are rounded.
10. A bone conduction headset, comprising: a housing structure, a magnetic circuit structure, and a vibration-transmitting plate according to any one of claims 1 to 9;
the shell structure is provided with an accommodating space, and the magnetic circuit structure and the vibration transmission piece are positioned in the accommodating space;
the annular structure of the vibration transmission piece is circumferentially connected with the inner wall of the shell structure, and the magnetic circuit structure is connected with the vibration piece of the vibration transmission piece.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220621093.XU CN217428322U (en) | 2022-03-21 | 2022-03-21 | Vibration transmission sheet and bone conduction earphone |
| TW111145634A TWI871548B (en) | 2022-03-21 | 2022-11-29 | A vibration transmitting plate and a bone conduction earphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220621093.XU CN217428322U (en) | 2022-03-21 | 2022-03-21 | Vibration transmission sheet and bone conduction earphone |
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| CN217428322U true CN217428322U (en) | 2022-09-13 |
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| CN202220621093.XU Active CN217428322U (en) | 2022-03-21 | 2022-03-21 | Vibration transmission sheet and bone conduction earphone |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117915238A (en) * | 2023-07-16 | 2024-04-19 | 东莞市惟动智能科技有限公司 | Runway type vibration transmission sheet device, vibrator system and application |
| WO2024234649A1 (en) * | 2023-05-12 | 2024-11-21 | 深圳市韶音科技有限公司 | Vibration transmission sheet, bone conduction loudspeaker and earphone |
| WO2025015452A1 (en) * | 2023-07-14 | 2025-01-23 | 深圳市韶音科技有限公司 | Loudspeaker |
-
2022
- 2022-03-21 CN CN202220621093.XU patent/CN217428322U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024234649A1 (en) * | 2023-05-12 | 2024-11-21 | 深圳市韶音科技有限公司 | Vibration transmission sheet, bone conduction loudspeaker and earphone |
| WO2025015452A1 (en) * | 2023-07-14 | 2025-01-23 | 深圳市韶音科技有限公司 | Loudspeaker |
| CN117915238A (en) * | 2023-07-16 | 2024-04-19 | 东莞市惟动智能科技有限公司 | Runway type vibration transmission sheet device, vibrator system and application |
Also Published As
| Publication number | Publication date |
|---|---|
| TW202339516A (en) | 2023-10-01 |
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