Loudspeaker

Abstract

A loudspeaker (100) comprises a supporting part (130), a magnetic circuit assembly (110) and a positioning assembly (120), the magnetic circuit assembly (110) is connected with the supporting part (130) through the positioning assembly (120), and the magnetic circuit assembly (110) vibrates relative to the supporting part (130); the positioning assembly (120) comprises two vibration transmission sheets (121, 122), the two vibration transmission sheets (121, 122) are distributed at intervals in the vibration direction of the magnetic circuit assembly (110), and two projections of the two vibration transmission sheets (121, 122) in the vibration direction have symmetry.

Description

A speaker Technical Field

[0001] This specification relates to the field of acoustic output devices, and in particular to a loudspeaker. Background Art

[0002] The transducer, a crucial component of a bone conduction speaker, transmits the vibrations generated by the bone conduction transducer to the housing. The vibrations are then transmitted through the skin, subcutaneous tissue, and bone to the auditory nerve, allowing the user to hear the sound. However, the transducer in a bone conduction speaker is prone to deviating from its vibration direction, potentially colliding with the housing or coil. Furthermore, the transducer is more susceptible to breakage due to the deviating vibrations of the transducer.

[0003] Therefore, it is necessary to propose a loudspeaker with improved structural reliability.

[0004] Summary of the Invention

[0005] One of the embodiments of the present specification provides a loudspeaker, which includes: a supporting portion, a magnetic circuit assembly and a positioning assembly, wherein the magnetic circuit assembly is connected to the supporting portion through the positioning assembly, and the magnetic circuit assembly vibrates relative to the supporting portion; the positioning assembly includes two vibration transmitting plates, the two vibration transmitting plates are spaced apart in the vibration direction of the magnetic circuit assembly, and the two projections of the two vibration transmitting plates along the vibration direction are symmetrical.

[0006] One of the embodiments of this specification also provides a loudspeaker, comprising: a supporting portion, a magnetic circuit assembly and a positioning assembly, wherein the magnetic circuit assembly is connected to the supporting portion through the positioning assembly, and the magnetic circuit assembly vibrates relative to the supporting portion; the positioning assembly comprises two vibration transmitting plates, the two vibration transmitting plates are spaced apart in the vibration direction of the magnetic circuit assembly, and the two vibration transmitting plates are asymmetrically distributed between two projections along the vibration direction.

[0007] Additional features will be described in part in the following description and will become apparent to those skilled in the art by reference to the following and accompanying drawings, or may be learned by practice or operation of the examples. The features of this specification may be realized and obtained by practicing or using the various aspects of the methods, tools, and combinations described in the following detailed examples. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] This specification will be further described in the form of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting, and in these embodiments, like numbers represent like structures, wherein:

[0009] FIG1 is a schematic diagram of a frame of a speaker according to some embodiments of this specification;

[0010] FIG2 is a schematic structural diagram of a speaker according to some embodiments of this specification;

[0011] FIG3 is a schematic diagram of four distributions of vibration transmission sheets according to some embodiments of this specification;

[0012] FIG4 is a schematic structural diagram of a first vibration transmission piece according to some embodiments of this specification;

[0013] FIG5A is a schematic structural diagram of a first vibration-transmitting element according to some embodiments of this specification;

[0014] FIG5B is a schematic structural diagram of a first vibration-transmitting element according to some embodiments of this specification;

[0015] FIG6A is a schematic structural diagram of a first vibration transmission element according to some embodiments of this specification;

[0016] FIG6B is a schematic structural diagram of a first vibration transmission element according to some embodiments of this specification;

[0017] FIG6C is a schematic structural diagram of a first vibration-transmitting element according to some embodiments of this specification;

[0018] FIG6D is a schematic structural diagram of a first vibration-transmitting element according to some embodiments of this specification;

[0019] FIG7 is a frequency response curve diagram of a loudspeaker using the vibration transmission pieces shown in FIG6B-FIG6D respectively;

[0020] FIG8 is a schematic diagram of three distributions of vibration transmission sheets according to some embodiments of this specification;

[0021] FIG9 is a schematic diagram of three distributions of vibration transmission sheets according to some embodiments of this specification;

[0022] FIG10A is a schematic structural diagram of a vibration transmission sheet according to some embodiments of this specification;

[0023] FIG10B is a schematic structural diagram of another vibration transmission piece according to some embodiments of this specification. Specific embodiments

[0024] In order to more clearly illustrate the technical solutions of the embodiments of this specification, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of this specification. For ordinary technicians in this field, this specification can also be applied to other similar scenarios based on these drawings without paying any creative work. It should be understood that these exemplary embodiments are provided only to enable technicians in the relevant fields to better understand and implement this specification, and do not limit the scope of this specification in any way. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0025] As used in this specification and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not specifically refer to the singular and may also include the plural, unless the context clearly indicates an exception. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been explicitly identified, and these steps and elements do not constitute an exclusive list. The method or apparatus may also include other steps or elements. The term "based on" means "at least in part based on." The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment."

[0026] In the description of this specification, it should be understood that the terms "front", "rear", "ear hook", "rear hook", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this specification and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this specification.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout this specification, "plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0028] In this specification, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this specification based on specific circumstances.

[0029] The present invention provides a speaker comprising a support portion, a magnetic circuit assembly, and a positioning assembly. The magnetic circuit assembly is connected to the support portion via the positioning assembly. The positioning assembly includes a first vibration transmitting plate and a second vibration transmitting plate. The first vibration transmitting plate and the second vibration transmitting plate are spaced apart in the vibration direction of the magnetic circuit assembly, and the first vibration transmitting plate and the second vibration transmitting plate are symmetrical between their two projections along the vibration direction. When the magnetic circuit assembly vibrates relative to the support portion, the first vibration transmitting plate and the second vibration transmitting plate transmit the vibration to the support portion, and then transmit the vibration to the user's auditory nerve through the user's skin, subcutaneous tissue, and bone, so that the user hears the sound. If a single vibration transmitting plate is used, the magnetic circuit assembly is prone to vibrating out of the vibration direction during vibration, which may collide with other components of the speaker (such as the housing or coil). At the same time, when the magnetic circuit assembly vibrates out of the vibration direction, the vibration transmitting plate is affected by the vibration and may flip. If the vibration transmitting plate has a shape with a long axis and a short axis, such as a runway-shaped structure, the vibration transmitting plate may flip around the long axis and the short axis, making the vibration transmitting plate prone to breakage. The loudspeaker provided in the embodiment of the present specification has vibration transmission plates respectively arranged on both sides of the magnetic circuit assembly along its vibration direction. The vibration direction of the magnetic circuit assembly is constrained by the vibration transmission plates on both sides. On the one hand, it can reduce the shaking of the magnetic circuit assembly during vibration. On the other hand, the arrangement of the double vibration transmission plates reduces the amplitude of the vibration transmission plate folding around its own long axis or short axis, thereby greatly extending the time before the vibration transmission plate breaks and is damaged, thereby ensuring the service life of the vibration transmission plate.

[0030] FIG1 is a schematic diagram of a frame of a speaker according to some embodiments of this specification.

[0031] As shown in Figure 1, the speaker 100 includes a magnetic circuit component 110, a positioning component 120 and a support portion 130, wherein the magnetic circuit component 110 is connected to the support portion 130 through the positioning component 120, and the support portion 130 is used to support other components in the speaker 100 such as the magnetic circuit component 110, the positioning component 120, etc.

[0032] In some embodiments, the magnetic circuit assembly 110 is connected to the support portion 130 via the positioning assembly 120, and the positioning assembly 120 may include at least one vibration transmitting piece. The magnetic circuit assembly 110 may generate mechanical vibrations along a vibration direction in response to an electrical signal. The mechanical vibrations generated by the magnetic circuit assembly 110 are transmitted to the positioning assembly, and the mechanical vibrations are transmitted to the support portion 130 (e.g., the housing) via the positioning assembly 120. When a user wears the speaker 100, part of the structure of the support portion 130 (e.g., one side of the housing or the vibration panel) contacts the user's skin. The support portion 130 transmits the mechanical vibrations through the user's skin, bones, and / or tissues to the user's auditory nerve, thereby enabling the user to hear the sound.

[0033] FIG2 is a schematic structural diagram of a speaker provided according to some embodiments of the present specification. In conjunction with FIG1 and FIG2, in some embodiments, the support portion 130 may include a housing 131, and a housing 131 may be formed with a housing for accommodating the magnetic circuit assembly 110 and the positioning assembly 120. In some embodiments, the positioning assembly 120 may be connected to the housing 131 and the magnetic circuit assembly 110 at the same time to suspend the magnetic circuit assembly 110 in the housing 131. When the user wears the speaker 100, a side wall of the housing 131 (for example, a vibration panel of the housing facing the face) contacts the human body, and the mechanical vibration generated by the magnetic circuit assembly 110 is transmitted to the housing 131 and transmitted to the user via the side wall of the housing 131 in contact with the human body, thereby realizing the conduction of bone-conducted sound waves. In some embodiments, the support portion 130 may include a housing 131 and a vibration panel (not shown in FIG2), the magnetic circuit assembly 110 and the positioning assembly 120 are arranged in the housing 131, and the vibration panel is connected to the positioning assembly 120. When a user wears speaker 100, the vibration panel contacts the body, and the mechanical vibration generated by magnetic circuit assembly 110 is transmitted to the vibration panel. This vibration is then transmitted to the user via the vibration panel in contact with the body, achieving bone conduction of sound waves. It should be noted that housing 131 can be a rectangular parallelepiped, cylindrical, terraced, or any other irregular shape, or any combination thereof, and is not limited to the shapes shown in the figures.

[0034] In some embodiments, the positioning assembly 120 may include two vibration transmitting plates (the first vibration transmitting plate 121 and the second vibration transmitting plate 122 shown in Figure 2), and the two vibration transmitting plates are spaced apart in the vibration direction of the magnetic circuit assembly 110. The two vibration transmitting plates are located on opposite sides of the magnetic circuit assembly 110 along the vibration direction, and the two vibration transmitting plates are symmetrically distributed between the two projections along the vibration direction, that is, they are symmetrical, and both sides of the magnetic circuit assembly 110 along the vibration direction are connected to the support part 130 through the vibration transmitting plates.

[0035] Since the two vibration transmitting plates are separated and arranged along the vibration direction and are not in the same plane, for the convenience of description, the description method of the two projections of the two vibration transmitting plates along the vibration direction being symmetrically distributed is adopted, which actually corresponds to the distribution method of the two vibration transmitting plates. In some embodiments, the vibration transmitting plates can be runway-shaped, rectangular, elliptical, circular, diamond-shaped or polygonal, or any irregular shape and a combination thereof. In order to more clearly illustrate the way in which the two projections of the two vibration transmitting plates along the vibration direction are symmetrically distributed, the runway-shaped vibration transmitting plate is used as an example for explanation. When the vibration transmitting plate is a runway-shaped structure, it has a long axis direction and a short axis direction. In some embodiments, the way in which the two projections of the two vibration transmitting plates along the vibration direction are symmetrically distributed can include that the two projections are symmetrical along the long axis. Here, the symmetry of the two projections about the long axis can be understood as that after one of the two vibration transmitting plates is flipped 180° along the long axis, the two projections of the two vibration transmitting plates in the vibration direction coincide. In some embodiments, the two projections of the two vibration transmitting plates along the vibration direction are symmetrically distributed, which may include the two projections being symmetrical about the short axis, where the symmetry of the two projections along the short axis can be understood as one of the two vibration transmitting plates flipped 180° along the short axis, and the two projections of the two vibration transmitting plates in the vibration direction overlap. In some embodiments, the two projections of the two vibration transmitting plates along the vibration direction are symmetrically distributed, which may include the two projections being centrally symmetrical, where the two projections being centrally symmetrical can be understood as one of the two vibration transmitting plates flipped 180° along the long axis and the short axis respectively, and the two projections of the two vibration transmitting plates in the vibration direction overlap. Taking the vibration transmitting plate as a circle as an example, the vibration transmitting plate has a first radial direction and a second radial direction perpendicular to the first radial direction, and the two projections of the two vibration transmitting plates along the vibration direction can be symmetrically distributed along the first radial direction, symmetrically distributed along the second radial direction, or centrally symmetrically distributed. For ease of description, the following explanation will be given by taking the vibration transmitting plate as a runway shape as an example.

[0036] Figure 3 is a schematic diagram of four distributions of vibration transmission plates according to some embodiments of this specification. As shown in Figure 3, the shape of the vibration transmission plate is a runway shape, and the vibration transmission plate has a long axis direction (i.e., the X direction shown in Figure 3) and a short axis direction (i.e., the Y direction shown in Figure 3). The two vibration transmission plates shown in area a in Figure 3 have two projections along the vibration direction that overlap. The two vibration transmission plates shown in area b in Figure 3 have two projections along the vibration direction that are symmetrical along their long axis directions. The two vibration transmission plates shown in area c in Figure 3 have two projections along the vibration direction that are symmetrical along their centers, where the center refers to the geometric center of the peripheral contour shape of the vibration transmission plate. The two vibration transmission plates shown in area d in Figure 3 have two projections along the vibration direction that are symmetrical along their short axis directions.

[0037] To compare the service life of the vibration plate under the four dual vibration plate distribution patterns shown in Figure 3, fatigue resistance tests were conducted on speakers with a single vibration plate and speakers using the four dual vibration plate distribution patterns shown in Figure 3. Fatigue here refers to the entire process of crack initiation and propagation, leading to fracture failure, caused by the vibration plate being subjected to varying loads during operation. In the experiment, the number of cycles to failure was used to characterize the fatigue resistance of the vibration plate. The number of cycles to failure can be measured through a roller test, for example, by applying a load in the long axis, short axis, or vertical axis (perpendicular to the long and short axes) of the vibration plate using a fatigue testing machine. A load was applied in the long axis, short axis, or vertical axis of the single vibration plate and the dual vibration plate arranged using the above distribution patterns, and the corresponding number of cycles to failure was measured. The specific results are shown in Table 1. A greater number of cycles to failure indicates better fatigue resistance and a longer service life. It should be noted that the number of cycles to failure measured in Table 1 is obtained based on the number of cycles at which a single vibration transmission plate breaks or the first of the two vibration transmission plates breaks.

[0038] Table 1

[0039] As can be seen from Table 1, the fatigue resistance of the two vibration transmission plates whose projections along the vibration direction overlap (distribution method in Figure 3a) in the long axis direction, short axis direction and vertical axis direction is much greater than the fatigue resistance of the vibration transmission plate set separately. From a structural point of view, the magnetic circuit assembly 110 is restricted by the vibration transmission plates on both sides along the vibration direction, which is conducive to reducing the shaking of the magnetic circuit assembly 110 that deviates from the vibration direction during vibration, thereby preventing the magnetic circuit assembly 110 from colliding with the support part, coil and other structures of the speaker 100 during vibration, thereby ensuring the acoustic output effect of the speaker 100. Furthermore, the fatigue resistance of the two vibration transmission plates whose projections along the vibration direction are symmetrical along their long axis, the two vibration transmission plates whose projections along the vibration direction are symmetrical along their short axis, and the two vibration transmission plates whose projections along the vibration direction are symmetrical along their center, in the long axis direction, short axis direction and vertical axis direction (i.e., the vibration direction) are significantly better than the fatigue resistance of the vibration transmission plates set separately. From the perspective of the overall fatigue resistance of the vibration transmission plate, its fatigue resistance in the long axis direction is slightly worse than that in the short axis direction and the vertical axis direction. In order to prevent cracking or breaking in the long axis direction of the vibration transmission plate, the distribution method of the two vibration transmission plates can focus on the fatigue resistance in the long axis direction. The two vibration transmission plates whose projections along the vibration direction are symmetrical along their short axis directions (distribution method in Figure 3d) have better fatigue resistance in the long axis direction than the vibration transmission plates that are set separately and the two vibration transmission plates whose projections along the vibration direction overlap, are symmetrical along the long axis direction, and are centrally symmetrical. Therefore, in some embodiments, in order to further improve the fatigue resistance of the vibration transmission plate in the long axis direction and ensure that the vibration transmission plate has a longer service life, the two projections of the two vibration transmission plates along the vibration direction can be symmetrical along their short axis directions.

[0040] It should be noted that the two vibration transmitting plates included in the loudspeaker 100 are not limited to being distributed symmetrically along the projection of the vibration direction. In some embodiments, the two vibration transmitting plates may be two vibration transmitting plates with different main body shapes. For example, one vibration transmitting plate is a circular structure, and the other vibration transmitting plate is a runway-shaped structure. In some embodiments, the two vibration transmitting plates may be two vibration transmitting plates with the same main body shape but different internal structures. For example, one vibration transmitting plate is a three-connecting rod structure as shown in FIG4 , and the other vibration transmitting plate is a four-connecting rod structure as shown in FIG5A-FIG5B or a two-connecting rod structure as shown in FIG6A-FIG6D. For another example, the shapes of the connecting rods of the two vibration transmitting plates (such as the shape of the curved portion) are different. For another example, the width dimensions of the connecting rods of the two vibration transmitting plates are different, and the width dimension refers to the dimension perpendicular to the extension direction of the connecting rod (see dimension A shown in FIG4 ). For a detailed description of the structure of the vibration transmitting plate, please refer to FIG4-FIG6D and the related descriptions.

[0041] In some embodiments, the two vibration transmitting plates may include a first vibration transmitting plate. Figure 4 is a schematic structural diagram of the first vibration transmitting plate shown in some embodiments of this specification. As shown in Figure 4, the first vibration transmitting plate 321 includes a central area 3211 and an edge area 3212, and the edge area 3212 is distributed on the peripheral side of the central area 3211, that is, the edge area 3212 is arranged around the central area 3211, and the central area 3211 is connected to the edge area 3212 through a connecting rod (for example, a first connecting rod 3213, a second connecting rod 3214 and a third connecting rod 3215), wherein one end of the connecting rod is connected to the outer edge of the central area 3211, and the other end of the connecting rod is connected to the inner edge of the edge area 3212. When the magnetic circuit assembly 110 is connected to the support portion 130 through the first vibration transmitting plate 321, the magnetic circuit assembly 110 is connected to the central area 3211, and the edge area 3212 is connected and fixed to the support portion 130.

[0042] In some embodiments, the edge area 3212 of the first vibration transmission plate 321 can be an annular structure. In some embodiments, the shape (outer contour shape) of the edge area 3212 can be a runway shape as shown in Figure 4, or a regular shape or irregular shape such as a circle, an ellipse, a triangle, a quadrilateral, a pentagon, a hexagon, etc. It should be noted that the runway shape of the vibration transmission plate can be understood as the runway-shaped edge area 3212 of the vibration transmission plate being an annular structure. In some embodiments, the inner contour shape and the outer contour shape of the edge area 3212 can be the same shape. For example, the outer contour shape of the edge area 3212 is a runway shape, and the inner contour shape of the edge area 3212 is also a runway shape. In some embodiments, the inner contour shape and the outer contour shape of the edge area 3212 can be different shapes. For example, the outer contour shape of the edge area 3212 can be a runway shape, and the inner contour shape of the edge area 3212 can be other shapes such as a circle or a rectangle.

[0043] In some embodiments, the central area 3211 is located in the hollow area of ​​the edge area 3212, and the central area 3211 can be a structure symmetrical along the short axis and symmetrical along the long axis as shown in Figure 4. In some embodiments, the area between the central area 3211 and the edge area 3212 can also be a shape symmetrical along the short axis and symmetrical along the long axis as shown in Figure 4. In some embodiments, the shape of the central area 3211 can be circular, triangular, quadrilateral, pentagonal, hexagonal or other regular or irregular shapes. In some embodiments, the shape of the central area 3211 can be the same as the shape of the edge area 3212. For example, the shape of the edge area 3212 and the central area 3211 can both be annular, that is, the edge area 3212 and the central area 3211 can form concentric circles. In some embodiments, the magnetic circuit assembly 110 can be connected to one of the surfaces of the central area 3211, and the connection method can include but is not limited to gluing, welding, clamping, pin connection or bolt connection.

[0044] In some embodiments, the connecting rod is located between the edge area 3212 and the center area 3211. When the vibration transmitter is in working condition, the vibration of the magnetic circuit assembly 110 can drive part of the structure of the vibration transmitter (for example, the center area 3211) to vibrate in a direction perpendicular to the plane where the vibration transmitter is located (i.e., the direction perpendicular to the page in Figure 3), so that the vibration generated by the magnetic circuit assembly 110 can be transmitted to the support part 130 through the vibration transmitter, and the vibration of the support part 130 is transmitted to the user's auditory nerve through the bones, blood, muscles, etc. of the user's head, so that the user can hear the sound.

[0045] In some embodiments, there may be multiple connecting rods for achieving a connection between the edge region 3212 and the center region 3211. In some embodiments, the number of connecting rods may be 2-5, which can ensure the stability of the first vibration transmission plate 321 during operation, so that the magnetic circuit assembly 110 is not easily deflected when vibrating along the vibration direction, and has higher reliability. The so-called deflection means that when the magnetic circuit assembly 110 vibrates, the actual vibration direction of the magnetic circuit assembly 110 is inconsistent with the vibration direction shown in FIG2 . For example, there is an angle between the actual vibration direction and the vibration direction shown in FIG2 , resulting in the plane where the edge region 3212 is located and the plane where the center region 3211 is located being non-parallel, that is, an abnormal state where the two planes have an angle. On the one hand, this state will cause the magnetic circuit assembly 110 to collide with other components of the speaker 100, affecting the acoustic output effect; on the other hand, it will cause the vibration transmission plate to flip around the major axis and minor axis directions, causing the connecting rod to easily break, affecting the service life of the vibration transmission plate.

[0046] In some embodiments, as shown in FIG4 , the plurality of connecting rods may include a first connecting rod 3213, a second connecting rod 3214, and a third connecting rod 3215. The first connecting rod 3213, the second connecting rod 3214, and the third connecting rod 3215 are connected between the outer edge of the central region 3211 and the inner edge of the edge region 3212. In some embodiments, the first connecting rod 3213, the second connecting rod 3214, and the third connecting rod 3215 are spaced apart along the circumference of the central region 3211. In some embodiments, the connecting rods may have a zigzag structure, comprising multiple zigzag structures (e.g., zigzag structures M and zigzag structures N shown in the dashed box in FIG4 ). The zigzag structures are curved to impart a predetermined elastic modulus to the connecting rods. Specifically, the first connecting rod 3213 has two zigzag structures, forming a continuous two-bend shape; the second connecting rod 3214 has four zigzag structures, forming a continuous four-bend shape; and the third connecting rod 3215 has three zigzag structures, forming a continuous three-bend shape. By adopting a bending structure, the elastic coefficient of the connecting rod in a specific direction (such as the long axis direction) can be reduced to enhance the toughness of the connecting rod and increase the deformation capacity of the vibration transmission plate, thereby effectively reducing the impact of the load on the connecting rod in this specific direction, thereby improving the service life of the first vibration transmission plate 321.

[0047] In some embodiments, the first connecting rod 3213, the second connecting rod 3214, and the third connecting rod 3215 may be asymmetrically distributed. Asymmetrical distribution here means that the first connecting rod 3213, the second connecting rod 3214, and the third connecting rod 3215 are neither symmetrically distributed along the midline of the long axis of the vibration transmission plate nor symmetrically distributed along the midline of the short axis of the vibration transmission plate.

[0048] Specifically, referring to Figure 4 , the first connecting rod 3213, the second connecting rod 3214, and the third connecting rod 3215 have different shapes and degrees of curvature, and the spacing between adjacent connecting rods in the circumferential direction of the central region 3211 is also different. The asymmetric distribution of the three connecting rods effectively solves the problem of the magnetic circuit assembly 110 connected to the central region 3211 colliding and generating abnormal noise within the housing 131 when it shakes.

[0049] It should be noted that the number of connecting rods in Figure 4 is for illustrative purposes only and does not constitute a limitation. In some embodiments, the number of connecting rods in the first vibration transmission plate 321 can also be two or more than three. For example, the vibration transmission plate can also include a fourth connecting rod and / or a fifth connecting rod.

[0050] Figure 5A is a schematic diagram of the structure of a first vibration transmitting plate according to some embodiments of this specification. Figure 5B is a schematic diagram of the structure of a first vibration transmitting plate according to some embodiments of this specification. Figures 5A and 5B illustrate two embodiments in which the first vibration transmitting plate 421 includes a first connecting rod 4213, a second connecting rod 4214, a third connecting rod 4215, and a fourth connecting rod 4216. In some embodiments, the first connecting rod 4213, the second connecting rod 4214, the third connecting rod 4215, and the fourth connecting rod 4216 can adopt a bending structure as shown in Figures 5A and 5B. Specifically, as shown in Figure 5A, the first connecting rod 4213 has three bending structures, the second connecting rod 4214 has four bending structures, the third connecting rod 4215 has three bending structures, and the fourth connecting rod 4216 has four bending structures. As shown in Figure 5B, the first connecting rod 4213 has three bends, the second connecting rod 4214 has two bends, the third connecting rod 4215 has three bends, and the fourth connecting rod 4216 has two bends. In some embodiments, the first connecting rod 4213 and the third connecting rod 4215 have the same bend structure, the second connecting rod 4214 and the third connecting rod 4215 have the same bend structure, the first connecting rod 4213 and the third connecting rod 4215 are symmetrical about the center of the first vibration transmission plate 421, the second connecting rod 4214 and the third connecting rod 4215 are symmetrical about the center of the first vibration transmission plate 421, and the circumferential spacing between adjacent connecting rods in the central region 4211 is the same or approximately the same. The symmetrical distribution of the four connecting rods ensures balanced force on the vibration transmission plate during operation, preventing unbalanced weight and flipping of the vibration transmission plate, and improving the fatigue resistance of the vibration transmission plate.

[0051] Figure 6A is a schematic diagram of the structure of a first vibration transmitting plate according to some embodiments of this specification. Figure 6B is a schematic diagram of the structure of a first vibration transmitting plate according to some embodiments of this specification. Figure 6C is a schematic diagram of the structure of a first vibration transmitting plate according to some embodiments of this specification. Figure 6D is a schematic diagram of the structure of a first vibration transmitting plate according to some embodiments of this specification. Figures 6A-6D illustrate various embodiments of a first vibration transmitting plate 521 comprising a first connecting rod 5213 and a second connecting rod 5214. In some embodiments, the first connecting rod 5213 and the second connecting rod 5214 may adopt the bending structures shown in Figures 5A-6D. Specifically, as shown in Figure 6A, the first connecting rod 5213 has two bending structures, and the second connecting rod 5214 has two bending structures. As shown in Figure 6B, the first connecting rod 5213 has three bending structures, and the second connecting rod 5214 has three bending structures. As shown in Figure 6C, the first connecting rod 5213 has three bending structures, and the second connecting rod 5214 has three bending structures. As shown in Figure 6D, the first connecting rod 5213 has two bends, and the second connecting rod 5214 has two bends. In some embodiments, the first connecting rod 5213 and the second connecting rod 5214 have the same bends and are symmetrical about the geometric center of the first vibration transmission plate 521. By symmetrically distributing the first connecting rod 5213 and the second connecting rod 5214 about the geometric center of the first vibration transmission plate 521, the vibration transmission plate is subjected to balanced forces during operation, preventing the vibration transmission plate from being overweight or tipping over, and improving the fatigue resistance of the vibration transmission plate when tipping over.

[0052] In some embodiments, the first connecting rod 5213 and the second connecting rod 5214 are distributed along or approximately along the long axis direction of the first vibration transmission plate 521, which can compensate for the fatigue resistance of the first vibration transmission plate 521 in the long axis direction and avoid cracking or breakage in the long axis direction of the vibration transmission plate.

[0053] Table 1 experimentally compares the effects of the distribution of dual vibration plates on their fatigue resistance along the major, minor, and vertical axes. However, the plates are also subject to rolling forces around the major and minor axes during operation. Therefore, the impact of these rolling forces on the plate's service life cannot be ignored. During the roller test, a specific rolling load was applied around the major and minor axes to a single vibration plate and a dual vibration plate (including three connecting rods) distributed as shown in Figure 2. The corresponding number of cycles to failure was measured. The specific results are shown in Table 2.

[0054] Table 2

[0055] Table 2 shows that the fatigue resistance of two vibration transducers whose projections overlap along the vibration direction, two vibration transducers whose projections are symmetrical along their major axis, two vibration transducers whose projections are symmetrical along their minor axis, and two vibration transducers whose projections are centrally symmetrical along the vibration direction all suffer from inferior fatigue resistance when flipped about the major axis and flipped about the minor axis compared to a single vibration transducer. While two vibration transducers (including three connecting rods) with symmetrical projections along the vibration direction can improve fatigue resistance along the major, minor, and vertical axes, fatigue resistance along the major and minor axes is very weak, particularly fatigue resistance along the major axis.

[0056] By applying a certain overturning load around the major axis and the minor axis to two vibration transmission plates containing four connecting rods symmetrically distributed along the projection of the vibration direction (as shown in Figures 5A and 5B) and two vibration transmission plates containing two connecting rods symmetrically distributed along the projection of the vibration direction (as shown in Figures 6A to 6D), the corresponding number of failure cycles is measured. The number of failure cycles corresponding to the double vibration transmission plate with two connecting rods symmetrically distributed as shown in Figures 6A to 6D is greater than the number of failure cycles corresponding to the double vibration transmission plate with four connecting rods symmetrically distributed as shown in Figures 5A and 5B. The results of the better number of failure cycles are exemplified as shown in Table 3.

[0057] Table 3

[0058] Based on Tables 2 and 3, it can be seen that in some embodiments, in order to improve the fatigue resistance of the vibration transmission plate around the major axis and minor axis directions, the two vibration transmission plates that are symmetrically distributed along the projection of the vibration direction can both use two symmetrically distributed connecting rods. For example, the two vibration transmission plates both use the two connecting rods that are symmetrically distributed about the center as shown in Figures 6A-6D, which can enhance the fatigue resistance of the vibration transmission plate in the major axis direction, minor axis direction and vertical axis direction, and at the same time improve the fatigue resistance of the vibration transmission plate when flipping around the major axis direction and the minor axis direction.

[0059] Figure 7 shows the frequency response curves of speakers using the vibration transducers shown in Figures 6B-6D, respectively. In Figure 7, Curve #1 represents the frequency response curve when the speaker uses the vibration transducer shown in Figure 6B, Curve #2 represents the frequency response curve when the speaker uses the vibration transducer shown in Figure 6C, and Curve #3 represents the frequency response curve when the speaker uses the vibration transducer shown in Figure 6D. As shown in Figure 7, the resonant frequency of the speaker using a dual vibration transducer structure with two connecting rods is no greater than 300Hz. This improves the speaker's frequency response at low frequencies and allows the speaker to have a flatter frequency response curve over a wider frequency band, thereby improving the speaker's signal-to-noise ratio in specific frequency bands (e.g., 300Hz-5000Hz). It should be noted that the above frequency response curves were obtained by measuring the speaker's vibration displacement using a Klippel analyzer while holding the speaker by the ear hook. The vibration displacement was converted into acceleration (dB value, referring to an acceleration of 1E-6m / s^2), where the test voltage was 1Vrms.

[0060] In some embodiments, the two vibration transmitting plates may include a first vibration transmitting plate and a second vibration transmitting plate, and the first vibration transmitting plate and the second vibration transmitting plate have the same structure. The first vibration transmitting plate and the second vibration transmitting plate may have a long axis direction and a short axis direction (i.e., the long axis dimension is larger than the short axis dimension), such as the runway-shaped first vibration transmitting plate 321 shown in FIG4 . In order to ensure the fatigue resistance of the two vibration transmitting plates in different directions (e.g., long axis direction, short axis direction, vertical axis direction, around the long axis direction, around the short axis direction) and to improve the service life of the two vibration transmitting plates, it is necessary to limit the stiffness coefficients of the two vibration transmitting plates in the long axis direction, short axis direction, vertical axis direction, flipping around the long axis direction, and flipping around the short axis direction.

[0061] In some embodiments, the first vibration transmitting plate and the second vibration transmitting plate may have a long axis direction and a short axis direction, and the equivalent stiffness of the first vibration transmitting plate and the second vibration transmitting plate along the long axis direction may be in the range of 7500N / m-12500N / m, so as to ensure the fatigue resistance of the first vibration transmitting plate and the second vibration transmitting plate in the long axis direction and prevent the two vibration transmitting plates from cracking or breaking along the long axis direction. The preferred range of the equivalent stiffness of the first vibration transmitting plate and the second vibration transmitting plate along the long axis direction may include 8500N / m-11500N / m, 9000N / m-10000N / m or 9500N / m-10500N / m. It should be noted that the equivalent stiffness of the first vibration transmitting plate and the second vibration transmitting plate along the long axis direction refers to the ability of the two vibration transmitting plates to resist deformation and pulling along the long axis direction.

[0062] In some embodiments, the first vibration transmitting plate and the second vibration transmitting plate may have a long axis direction and a short axis direction, and the equivalent stiffness of the first vibration transmitting plate and the second vibration transmitting plate in the short axis direction may be in the range of 15000N / m-25000N / m, so as to ensure the fatigue resistance of the first vibration transmitting plate and the second vibration transmitting plate along the short axis direction and prevent the first vibration transmitting plate and the second vibration transmitting plate from cracking or breaking along the short axis direction. The preferred range of the equivalent stiffness of the first vibration transmitting plate and the second vibration transmitting plate along the short axis direction may include 16000N / m-24000N / m, 17000N / m-23000N / m, 18000N / m-22000N / m or 19000N / m-21000N / m. It should be noted that the equivalent stiffness of the first vibration transmitting plate and the second vibration transmitting plate along the short axis direction refers to the ability of the two vibration transmitting plates to resist deformation and pulling along the short axis direction.

[0063] In some embodiments, when the first vibration transmitting plate can be circular (for example, the edge region 1012 shown in FIG. 10A and FIG. 10B is annular, and the major axis and minor axis dimensions are the same), the equivalent stiffness of the first vibration transmitting plate and the second vibration transmitting plate along the extension direction of the connecting rod can be in the range of 10,000 N / m-20,000 N / m, so as to ensure the fatigue resistance of the first vibration transmitting plate and the second vibration transmitting plate along the extension direction of the connecting rod and prevent the first vibration transmitting plate or the second vibration transmitting plate from cracking or breaking in the extension direction of the connecting rod. When the first vibration transmitting plate and the second vibration transmitting plate are circular, the preferred range of the equivalent stiffness of the first vibration transmitting plate and the second vibration transmitting plate along the extension direction of the connecting rod may include 11,000 N / m-19,000 N / m, 12,000 N / m-18,000 N / m, 13,000 N / m-17,000 N / m, or 14,000 N / m-16,000 N / m.

[0064] In some embodiments, when the first vibration transmitting plate and the second vibration transmitting plate are runway-shaped or circular, the equivalent stiffness of the first vibration transmitting plate and the second vibration transmitting plate in the vertical axis direction (i.e., the vibration direction) can be in the range of 1200N / m-2000N / m to ensure the fatigue resistance of the first vibration transmitting plate and the second vibration transmitting plate in the vertical axis direction and prevent the first vibration transmitting plate or the second vibration transmitting plate from cracking or breaking in the vertical axis direction. When the first vibration transmitting plate and the second vibration transmitting plate are runway-shaped or circular, the preferred range of the equivalent stiffness of the first vibration transmitting plate and the second vibration transmitting plate in the vertical axis direction may include 1300N / m-1900N / m, 1400N / m-1800N / m or 1500N / m-1700N / m. The equivalent stiffness K of the first vibration transmitting plate and the second vibration transmitting plate in the vertical axis direction (i.e., the vibration direction) can be calculated by the mass m of the magnetic circuit component and the resonant frequency f0 of the speaker through the formula K=m×(2πf0) 2 Obtained by calculation.

[0065] In some embodiments, the first vibration transmitting plate and the second vibration transmitting plate may have a long axis direction and a short axis direction, and the equivalent stiffness of the first vibration transmitting plate and the second vibration transmitting plate when flipping around the long axis direction may be in the range of 0.05-0.15N*m / rad, so as to ensure the fatigue resistance of the first vibration transmitting plate and the second vibration transmitting plate when flipping around the long axis direction, and prevent the first vibration transmitting plate or the second vibration transmitting plate from cracking or breaking when flipping around the long axis direction. The preferred range of the equivalent stiffness of the first vibration transmitting plate and the second vibration transmitting plate when flipping around the long axis direction may include 0.07-0.14N*m / rad, 0.08-0.12N*m / rad or 0.09-0.11N*m / rad. It should be noted that the equivalent stiffness of the first vibration transmitting plate and the second vibration transmitting plate when flipping around the long axis direction refers to the ability of the two vibration transmitting plates to resist deformation and pulling when flipping around the long axis direction.

[0066] In some embodiments, the first vibration transmitting plate and the second vibration transmitting plate may have a long axis direction and a short axis direction, and the equivalent stiffness of the first vibration transmitting plate and the second vibration transmitting plate when flipping around the short axis direction may be in the range of 0.1-0.2N*m / rad, so as to ensure the fatigue resistance of the first vibration transmitting plate when flipping around the short axis direction, and prevent the first vibration transmitting plate from cracking or breaking when flipping around the short axis direction. The preferred range of the equivalent stiffness of the first vibration transmitting plate when flipping around the short axis direction may include 0.12-0.18N*m / rad, 0.13-0.17N*m / rad or 0.14-0.16N*m / rad. It should be noted that the equivalent stiffness of the first vibration transmitting plate and the second vibration transmitting plate when flipping around the short axis direction refers to the ability of the two vibration transmitting plates to resist deformation and pulling when flipping around the short axis direction.

[0067] In some embodiments, when the first vibration transmitting plate and the second vibration transmitting plate are circular, the first vibration transmitting plate and the second vibration transmitting plate are subjected to a flipping force around the extension direction of the connecting rod, and the equivalent stiffness of the first vibration transmitting plate and the second vibration transmitting plate flipping around the extension direction of the connecting rod can be in the range of 0.1N*m / rad-0.15N*m / rad, so as to ensure the fatigue resistance of the first vibration transmitting plate and the second vibration transmitting plate when flipping around the extension direction of the connecting rod, and prevent the first vibration transmitting plate or the second vibration transmitting plate from cracking or breaking when flipping around the extension direction of the connecting rod. When the first vibration transmitting plate and the second vibration transmitting plate are circular, the preferred range of the equivalent stiffness of the first vibration transmitting plate and the second vibration transmitting plate flipping around the extension direction of the connecting rod can include 0.11-0.14N*m / rad, 0.12-0.135N*m / rad or 0.125-0.13N*m / rad. It should be noted that the flipping stiffness of the first vibration transmitting plate and the second vibration transmitting plate can be calculated by torque = stiffness * angle of rotation (radians).

[0068] Figures 10A and 10B are schematic diagrams of the structure of the vibration transmission plate provided according to some embodiments of the present specification. As shown in Figure 10A, the edge area 1012 of the vibration transmission plate is annular, the center area 1011 is located in the hollow area of ​​the edge area, and one end of the connecting rod 1013 is connected to the outer edge of the center area 1011, and the other end is connected to the inner edge of the edge area 1012. In some embodiments, the connecting rod 1013 can adopt a circuitous bending structure, and the circuitous bending structure includes a plurality of bending structures, and the bending structure is a curved shape so that the connecting rod has a preset elastic coefficient. Specifically, the connecting rod 1013 has two bending structures, which are continuous two-bend shapes. By adopting a bending structure, the elastic coefficient of the connecting rod in a specific direction (for example, a radial direction) can be reduced to enhance the toughness of the connecting rod and increase the deformation capacity of the vibration transmission plate, thereby effectively reducing the impact of the load on the connecting rod in the specific direction, thereby improving the service life of the vibration transmission plate. In some embodiments, the number of connecting rods 1013 can be multiple, for example, two as shown in FIG10A, and the multiple connecting rods 1013 can be symmetrically arranged so that when the magnetic circuit assembly vibrates along the vibration direction, the force on the magnetic circuit assembly is balanced, thereby reducing the vibration of the magnetic circuit assembly deviating from the vibration direction. Referring to FIG10B, the connecting rod 1013 can be an arc-shaped sheet structure, and the number of connecting rods 1013 is three, and the three connecting rods 1013 can be symmetrical about the center of the vibration transmission plate. It should be noted that the number of connecting rods is not limited to the two and three described in FIG10A and FIG10B, but can also be more than three. In addition, the connecting rod is not limited to the bending structure or arc-shaped sheet structure shown in FIG10A and FIG10B.

[0069] In some embodiments, the stiffness of the first and second transducers in different directions is related to the structure of the connecting rod (e.g., the degree of curvature) and the distribution of the connecting rod relative to the center and edge regions. In some embodiments, the stiffness coefficients of the first and second transducers are related to parameters of the connecting rod itself, for example, the stiffness coefficients of the first and second transducers are related to the thickness and width of the connecting rod.

[0070] In some embodiments, the width and thickness of the connecting rod can be adjusted so that the stiffness coefficients of the two vibration transmitting plates in each direction meet the specified range. The width of the connecting rod refers to the dimension perpendicular to the extension direction of the connecting rod (see dimension A shown in FIG4 ), and the thickness of the connecting rod refers to the dimension of the connecting rod along the vertical axis direction (i.e., the vibration direction). In some embodiments, the width of each connecting rod can range from 0.2 mm to 0.66 mm. The preferred range of the width of the connecting rod can include 0.3 mm to 0.52 mm. In some embodiments, the thickness of each connecting rod can range from 0.1 mm to 0.15 mm. In some embodiments, by adjusting the width and thickness of the connecting rod, the stiffness coefficient of the connecting rod can be increased so that the stiffness of the first vibration transmitting plate and the second vibration transmitting plate in each direction meets the specified range, and the resonance peaks generated by the first vibration transmitting plate and the second vibration transmitting plate as the magnetic circuit assembly 110 vibrates can also meet a specific range. In some embodiments, the first vibration transmission plate and the second vibration transmission plate can generate a resonance peak not exceeding 300 Hz when vibrating with the magnetic circuit assembly 110, which can improve the frequency response of the speaker 100 at low frequencies, and at the same time make the frequency response curve of the speaker 100 relatively flat within a wider frequency band, thereby improving the signal-to-noise ratio of the speaker 100.

[0071] In addition, in some embodiments, the stiffness coefficients of the first and second vibration transmission plates are also related to their own materials. In some embodiments, the materials of the two vibration transmission plates can be beryllium copper, stainless steel, etc.

[0072] In some embodiments, the width of the connecting rod can vary along its extension direction. As shown in FIG4 , taking the first connecting rod 3213 as an example, the first connecting rod 3213 includes a first portion 32131 connecting to the central region 3211, a second portion 32133 connecting to the edge region 3212, and a third portion 32132 located between the first portion 32131 and the second portion 32133. When the vibration transmitter is in operation, stress is relatively concentrated in the first portion 32131 connected to the central region 3211 and the second portion 32133 connected to the edge region 3212. To ensure the structural stability of the connecting rod and prevent cracking or breakage of the first portion 32131 and the second portion 32133 of the connecting rod, the stiffness coefficients of the first portion 32131 and the second portion 32133 of the connecting rod can be increased. In some embodiments, the widths of the first and second portions 32131 and 32133 can be greater than the width of the third portion 32132 to increase the stiffness coefficients of the first and second portions 32131 and 32133 of the connecting rod, thereby enhancing the structural strength between the connecting rod and the central region 3211 and edge region 3212. The widths of the connecting rod vary across different regions. For example, the resonant frequency of the speaker is negatively correlated with the width of the third portion 32132. For example, the wider the third portion 32132, the lower the resonant frequency. However, the fatigue resistance of the speaker is positively correlated with the width of the connecting rod. To prevent the speaker's resonant frequency from being too high while ensuring fatigue resistance, the width of the third portion 32132 should be neither too large nor too small. Therefore, in some embodiments, the width of the third portion 32132 is between 0.2 mm and 0.66 mm to ensure that the speaker's resonant frequency does not exceed 300 Hz, while ensuring the fatigue resistance of the vibration transmission plate and increasing its service life.

[0073] Continuing to refer to Figures 1 and 2, in some embodiments, the magnetic circuit assembly 110 includes a first magnet 111, a magnetic conductive plate 112, a second magnet 113, and a magnetic conductive cover 114, which are arranged in sequence along the vibration direction shown in Figure 2. In some embodiments, the first magnet 111 and the second magnet 113 can be respectively connected to opposite sides of the magnetic conductive plate 112 along the vibration direction. In some embodiments, the magnetic conductive cover 114 is disposed on a side of the second magnet 113 away from the first magnet 111, and the magnetic conductive cover 114 surrounds the first magnet 111, the magnetic conductive plate 112, and the second magnet 113 in the vibration direction (i.e., the bottom surface of the groove of the magnetic conductive cover 114 is connected to the side of the second magnet 113 away from the first magnet 111). In some embodiments, the speaker 100 may further include a coil 140, which extends into the gap between the first magnet 111 and the magnetic conductive cover 114 from the side away from the magnetic conductive cover 114 along the vibration direction. The magnetic field generated by the coil 140 after being energized interacts with the magnetic field formed by the magnetic circuit assembly 110 , thereby driving the magnetic circuit assembly 110 to generate mechanical vibration.

[0074] In some embodiments, the two vibration transmission plates of the speaker 100 may include a first vibration transmission plate 121 and a second vibration transmission plate 122 (hereinafter referred to as vibration transmission plates), wherein the first vibration transmission plate 121 and the second vibration transmission plate 122 have the same structure. The vibration transmission plate may be the first vibration transmission plate provided in any embodiment of this specification (for example, the first vibration transmission plate 321, 421 or 521). In some embodiments, the first vibration transmission plate 121 is arranged on the side of the first magnet 111 facing away from the second magnet 113 to support the magnetic circuit assembly 110, and the second vibration transmission plate 122 is arranged on the side of the second magnet 113 facing away from the first magnet 111 to support the magnetic circuit assembly 110. In some embodiments, the central area of ​​the first vibration transmission plate 121 is connected to the side of the first magnet 111 facing away from the second magnet 113, and the central area of ​​the second vibration transmission plate 122 is connected to the side of the second magnet 113 facing away from the first magnet 111. The two projections of the first vibration transmission piece 121 and the second vibration transmission piece 122 along the vibration direction may overlap, be symmetrical along the long axis, symmetrical along the short axis, or be centrally symmetrical (for example, the four distribution modes shown in FIG3 ).

[0075] In some embodiments, the vibration transmitter and the magnetic circuit assembly 110 are located in the accommodation cavity of the shell 131. In some embodiments, the vibration transmitter can be directly connected to the shell 131. For example, the edge area of ​​the vibration transmitter is connected to the inner wall of the shell 131 in the circumferential direction by one or more methods such as snap connection and gluing. For another example, the shell 131 is a structure with an opening, and the edge area of ​​the vibration transmitter is located at the opening on the shell 131, and the opening is covered with a cover plate to fix the edge area of ​​the vibration transmitter and the shell 131. The central area of ​​the vibration transmitter is used to connect to the magnetic circuit assembly 110. For example, the central area is connected to the magnetic circuit assembly 110 by bonding, welding, threaded connection, etc. In some embodiments, a first connector 150 is provided on a side of the central region of the first vibration transmitting plate 121 close to the magnetic circuit assembly 110, and a second connector 151 is provided on a side of the central region of the second vibration transmitting plate 122 close to the magnetic circuit assembly. The first connector 150 and the second connector 151 can be fixedly connected to the magnetic circuit assembly 110 via a screw 160, thereby achieving a connection between the central region of the vibration transmitting plate and the magnetic circuit assembly 110. Specifically, threaded holes are provided in the central regions of the first connector 150 and the second connector 151, and the two ends of the screw 160 are respectively connected to the threaded holes in the central regions of the first connector 150 and the second connector 151 through threaded fitting. When the magnetic circuit assembly 110 vibrates, the vibration can be transmitted to the housing 131 through the vibration transmitting plate, and finally transmitted to the auditory nerve of the user, so that the user hears the sound. It should be noted that the connection method of the first connector 150 and the second connector 151 to the central region of the vibration transmitting plate is not limited to the above-mentioned threaded connection, and can also be welding, bonding, interference fit, etc. The connection method between the first connecting member 150 and the first vibration transmitting plate 121 and the connection method between the second connecting member 151 and the second vibration transmitting plate 122 can be the same or different. For example, the first connecting member 150 is connected to the central area of ​​the first vibration transmitting plate 121 by a threaded connection, and the second connecting member 151 is connected to the central area of ​​the second vibration transmitting plate 122 by welding.

[0076] The loudspeaker 100 supports the magnetic circuit assembly 110 from both sides of the magnetic circuit assembly 110 along the vibration direction by adopting double vibration transmission plates, which can reduce the shaking of the magnetic circuit assembly 110 that deviates from the vibration direction during vibration, and correspondingly reduce the influence of the vibration transmission plate on the shaking of the magnetic circuit assembly 110, thereby reducing the amplitude of the vibration transmission plate folding around its own long axis or short axis direction, thereby greatly extending the time before the vibration transmission plate breaks and is damaged, thereby ensuring the service life of the vibration transmission plate.

[0077] In some embodiments, the magnetic circuit assembly 110 may collide with the vibration plate during vibration, affecting the acoustic performance of the speaker 100 and the service life of the vibration plate. In order to avoid the collision between the magnetic circuit assembly 110 and the vibration plate in the vibration direction, the distance B between the two opposite sides of the first magnet 111 and the first vibration plate 121 (see Figure 2) is not less than 0.9 mm. Similarly, the distance C between the two opposite sides of the magnetic cover 114 and the second vibration plate 122 (see Figure 2) is not less than 0.9 mm. In some embodiments, in order to make the size of the speaker 100 as small as possible to improve the portability of the speaker 100 and avoid the collision between the magnetic circuit assembly 110 and the vibration plate, the distance B and the distance C can be in the range of 0.9 mm-1.8 mm. Preferably, the distance B and the distance C can be in the range of 0.9 mm-1.6 mm. More preferably, the distance B and the distance C can be in the range of 0.9 mm-1.4 mm.

[0078] By limiting the distance between the magnetic circuit assembly 110 and the vibration transmission plate, collision between the magnetic circuit assembly 110 and the vibration transmission plate during vibration can be avoided, thereby ensuring the acoustic performance of the speaker 100 and the service life of the vibration transmission plate.

[0079] 2 , in some embodiments, the magnetic circuit assembly 110 may collide with a bracket (e.g., the first bracket 132 ), the coil 140 , or the housing 131 during vibrations that deviate from the vibration direction. To prevent collisions between the magnetic shield 114 of the magnetic circuit assembly 110 and the coil 140 , and between the magnetic circuit assembly 110 and the bracket perpendicular to the vibration direction, the distance D (also referred to as the inner magnetic gap) between the magnetic elements (e.g., the first magnet, the magnetic plate, and the second magnet) and the first bracket 132 , and the distance D (also referred to as the outer magnetic gap) between the magnetic shield 114 and the coil 140 , perpendicular to the vibration direction, is no less than 0.3 mm. To prevent collisions between the magnetic shield 114 of the magnetic circuit assembly 110 and the housing 131 perpendicular to the vibration direction, the distance E (see FIG. 2 ) between the two opposing side surfaces of the magnetic shield 114 and the housing 131 perpendicular to the vibration direction is no less than 0.3 mm. In some embodiments, to minimize the size of the speaker 100 to improve its portability and prevent collision between the magnetic circuit assembly 110 and the coil 140 or the housing 131, the distance D and the distance E may be within a range of 0.3 mm to 1 mm. Preferably, the distance D and the distance E may be within a range of 0.3 mm to 0.8 mm. More preferably, the distance D and the distance E may be within a range of 0.3 mm to 0.6 mm.

[0080] In some embodiments, referring to Figures 1 and 2 , the support portion 130 may further include a first bracket 132 and a second bracket 133. The first bracket 132 and the second bracket 133 are spaced apart along the vibration direction and fixedly connected to the housing 131. The first bracket 132 and the second bracket 133 provide mounting platforms for the first and second vibration transmitting plates 121 and 122, respectively. The first bracket 132 also provides a mounting platform for the coil 140. In some embodiments, the edge region of the first vibration transmitting plate 121 and the coil 140 are fixed to the first bracket 132, while the edge region of the second vibration transmitting plate 122 is fixed to the second bracket 133. Specifically, a portion of the edge region of the first vibration transmitting plate 121 (e.g., a portion near its circumference) is embedded in the first bracket 132, and the coil 140 is connected to the first bracket 132 near the side of the magnetic circuit assembly 110. In some embodiments, the coil 140 may also be fixed to the housing 131 or the first bracket 132 by other means. For example, the coil 140 is directly connected to the inner wall of the housing 131 via a connecting rod. For another example, the first bracket 132 does not extend into the magnetic gap between the magnetic shield 114 and the magnetic elements (e.g., the first magnet, the magnetic plate, and the second magnet). One end of the coil 140 is connected to the first bracket 132, while the other end extends into the magnetic gap. A portion of the edge of the second vibration transmission plate 122 (e.g., the portion near its periphery) is embedded in the second bracket 133.

[0081] By setting a first bracket 132 to fix the first vibration transmission plate 121 and the coil 140, the consistency of the vibration of the vibration component can be ensured. At the same time, by setting a second bracket 133 to fix the second vibration transmission plate 122, the structural stability between the coil 140, the vibration transmission plate and the magnetic circuit component 110 can be improved, ensuring that the coil 140, the vibration transmission plate and the magnetic circuit component 110 can operate reliably during the long-term operation of the speaker 100.

[0082] Considering the end where the magnetic shield 114 is located as the bottom of the magnetic circuit assembly 110, the center of gravity of the magnetic circuit assembly 110 is closer to the bottom due to the magnetic shield 114 being located at the bottom of the magnetic circuit assembly 110. In some embodiments, the second vibration transmission plate 122 near the bottom of the magnetic circuit assembly 110 can be made harder than the first vibration transmission plate 121 farther from the bottom of the magnetic circuit assembly 110. This allows the second vibration transmission plate 122 to accommodate greater oscillations near the bottom of the magnetic circuit assembly 110, thereby reducing oscillations of the magnetic circuit assembly 110 when vibrating in the vibration direction and preventing tilting of the magnetic circuit assembly 110. In some embodiments, the Young's modulus of the second vibration transmission plate 122 is greater than that of the first vibration transmission plate 121, achieving a greater hardness for the second vibration transmission plate 122 than for the first vibration transmission plate 121. For example, the second vibration transmission plate 122 can be made of stainless steel, which has a higher Young's modulus, while the first vibration transmission plate 121 can be made of beryllium copper, which has a lower Young's modulus. In order for the second vibration transmission plate 122 to adapt to the larger shaking of the magnetic circuit assembly 110 near its bottom area, reduce the shaking of the magnetic circuit assembly 110 when it vibrates in the vibration direction, and prevent the magnetic circuit assembly 110 from tilting, in some embodiments, the ratio of the Young's modulus of the second vibration transmission plate 122 to the Young's modulus of the first vibration transmission plate 121 is in the range of 1-1.5.

[0083] By setting a second vibration transmission plate 122 with a harderness greater than that of the first vibration transmission plate 121, the second vibration transmission plate 122 can adapt to the larger shaking and heavier shaking of the magnetic circuit assembly 110 near its bottom area, thereby ensuring that the service life of the first vibration transmission plate 121 and the second vibration transmission plate 122 are close to each other, and at the same time preventing the magnetic circuit assembly 110 from tilting, which is beneficial to reducing the shaking of the magnetic circuit assembly 110 when it vibrates in the vibration direction.

[0084] In some embodiments, the first vibration transmission plate 121 and the second vibration transmission plate 122 included in the speaker 100 can be asymmetrically distributed between the two projections along the vibration direction. At this time, other parts of the speaker 100 (such as the support part 130 and the magnetic circuit assembly 110) can refer to Figures 1 and 2 and related descriptions.

[0085] In some embodiments, when the two vibration transmitting plates are asymmetrically distributed along the two projections of the vibration direction, the two vibration transmitting plates may be two vibration transmitting plates with different structures. In some embodiments, the shapes of the two vibration transmitting plates with different structures may be different. For example, the first vibration transmitting plate 121 is a circular vibration transmitting plate, and the second vibration transmitting plate 122 is a runway-shaped vibration transmitting plate. In some embodiments, the number and / or structure of the connecting rods included in the two vibration transmitting plates with different structures may be different. Figure 7 is a schematic diagram of three distributions of vibration transmitting plates according to some embodiments of this specification. Figure 9 is a schematic diagram of three distributions of vibration transmitting plates according to some embodiments of this specification. a, b and c in Figure 8 show various embodiments in which two vibration transmitting plates with different structures include different numbers of connecting rods. a, b and c in Figure 9 show various embodiments in which two vibration transmitting plates with different structures include different structures of connecting rods. Among them, the first vibration transmitting plate 121 or the second vibration transmitting plate 122 may be any one of those shown in Figures 4 to 6D.

[0086] In some embodiments, when two vibration transmitters are asymmetrically distributed along the two projections of the vibration direction, the two vibration transmitters can be two vibration transmitters with the same structure, but the arrangement angles of the two vibration transmitters are different. Specifically, taking a runway-shaped vibration transmitter as an example, the vibration transmitter has a long axis direction and a short axis direction, and the long axis direction of the first vibration transmitter 121 and the long axis direction of the second vibration transmitter 122 are arranged at a certain angle, so that the arrangement angles of the two vibration transmitters are different. For example, the long axis direction of the first vibration transmitter 121 is perpendicular to the long axis direction of the second vibration transmitter 122, the inner edge of the edge area of ​​the first vibration transmitter 121 is located at the outer edge of the edge area of ​​the second vibration transmitter 122, and the center area of ​​the first vibration transmitter 121 does not contact the center area of ​​the second vibration transmitter 122, and the magnetic circuit component is located in the center area of ​​the first vibration transmitter 121 or the second vibration transmitter 122.

[0087] The asymmetrically distributed first vibration transmitting plate 121 and the second vibration transmitting plate 122 are respectively located on opposite sides of the magnetic circuit assembly 110 along the vibration direction. The vibration of the magnetic circuit assembly 110 is limited by the vibration transmitting plates on both sides. On the one hand, it can reduce the shaking of the magnetic circuit assembly 110 during vibration. On the other hand, by setting up the double vibration transmitting plates, the shaking of the magnetic circuit assembly 110 is reduced, and the amplitude of the vibration transmitting plates folding around their own long axis or short axis is reduced, so that the time for the vibration transmitting plates to break and be damaged is greatly extended, thereby ensuring the service life of the vibration transmitting plates. For the specific description of the first vibration transmitting plate 121 and the second vibration transmitting plate 122, please refer to the relevant description of the vibration transmitting plates in the previous text (such as Figures 1, 4-6D), which will not be repeated here.

[0088] In some embodiments, the first vibration-transmitting plate 121 is positioned away from the magnetic shield 114 of the magnetic circuit assembly 110, while the second vibration-transmitting plate 122 is positioned closer to the magnetic shield 114 of the magnetic circuit assembly 110. Because the magnetic shield 114 is positioned at the bottom of the magnetic circuit assembly 110, the center of gravity of the magnetic circuit assembly 110 is closer to the bottom. This means that in the vibration direction, the distance from the center of gravity of the magnetic circuit assembly 110 to the second vibration-transmitting plate 122 is shorter than the distance to the first vibration-transmitting plate 121. Therefore, the second vibration-transmitting plate 122 must possess greater rigidity and hardness than the first vibration-transmitting plate 121 to resist rollover and fatigue.

[0089] In some embodiments, the second vibration transmission piece 122 can be made harder than the first vibration transmission piece 121. This allows the second vibration transmission piece 122 to accommodate greater oscillations of the magnetic circuit assembly 110 near its bottom, thereby reducing oscillations of the magnetic circuit assembly 110 when vibrating in the vibration direction and preventing tilting of the magnetic circuit assembly 110. In some embodiments, the width of the connecting rod of the second vibration transmission piece 122 can be greater than the width of the connecting rod of the first vibration transmission piece 121, thereby ensuring that the second vibration transmission piece 122 has a greater hardness than the first vibration transmission piece 121.

[0090] By making the width of the connecting rod of the second vibration transmission plate 122 greater than the width of the connecting rod of the first vibration transmission plate 121, the hardness of the second vibration transmission plate 122 is made greater than the hardness of the first vibration transmission plate 121, so that the second vibration transmission plate 122 can adapt to the larger amplitude and heavier weight shaking of the magnetic circuit assembly 110 near its bottom area, and can ensure that the service life of the first vibration transmission plate 121 and the second vibration transmission plate 122 are close to each other, and at the same time prevent the magnetic circuit assembly 110 from tilting, which is beneficial to reduce the shaking of the magnetic circuit assembly 110 when it vibrates in the vibration direction.

[0091] In some embodiments, the vibration transmitting plate generates a resonance peak no greater than 300 Hz (e.g., 150 Hz-250 Hz) when the magnetic circuit assembly 110 vibrates. This can improve the frequency response of the speaker 100 at low frequencies, while also providing a flatter frequency response curve for the speaker 100 over a wider frequency range, thereby improving the signal-to-noise ratio of the speaker 100. In some embodiments, the thickness and width of the connecting rod of the vibration transmitting plate can be adjusted to ensure that the second vibration transmitting plate 122 generates a resonance peak no greater than 300 Hz when the magnetic circuit assembly 110 vibrates. However, adjusting the width and thickness of the connecting rod of the vibration transmitting plate will affect the frequency of the resonance peak generated by the vibration transmitting plate when the magnetic circuit assembly 110 vibrates. In order to ensure that the second vibration transmission plate 122 vibrates with the magnetic circuit assembly 110 to produce a resonance peak not exceeding 300 Hz, while making the width of the connecting rod of the second vibration transmission plate 122 greater than the width of the connecting rod of the first vibration transmission plate 121, the thickness of the connecting rod of the second vibration transmission plate 122 can be made smaller than the thickness of the connecting rod of the first vibration transmission plate 121, thereby improving the frequency response of the second vibration transmission plate 122 at low frequencies, and at the same time making the frequency response curve of the speaker 100 relatively flat within a wider frequency band, thereby improving the signal-to-noise ratio of the speaker 100. It should be noted that increasing the thickness of the connecting rod of the second vibration transmission plate 122 while reducing the width of the connecting rod of the second vibration transmission plate 122 can also reduce the shaking of the magnetic circuit assembly 110 when it vibrates in the vibration direction, while ensuring that the second vibration transmission plate 122 produces a resonance peak of no more than 300 Hz when the magnetic circuit assembly 110 vibrates. However, increasing the width of the connecting rod of the second vibration transmission plate 122 is more conducive to reducing the shaking of the magnetic circuit assembly 110 when it vibrates in the vibration direction. Therefore, it can be given priority to increase the width of the connecting rod of the second vibration transmission plate 122 while reducing the thickness of the connecting rod of the second vibration transmission plate 122.

[0092] By making the width of the connecting rod of the second vibration transmission plate 122 greater than the width of the connecting rod of the first vibration transmission plate 121, and the thickness of the connecting rod of the second vibration transmission plate 122 less than the thickness of the connecting rod of the first vibration transmission plate 121, the magnetic circuit assembly 110 can be prevented from tilting, which is beneficial to reducing the shaking of the magnetic circuit assembly 110 when vibrating in the vibration direction, and improving the frequency response of the speaker 100 at low frequencies, while making the frequency response curve of the speaker 100 relatively flat within a wider frequency band.

[0093] In some embodiments, the number of connecting rods of the second vibration transmission plate 122 can be greater than the number of connecting rods of the first vibration transmission plate 121, so that the hardness of the second vibration transmission plate 122 is greater than the hardness of the first vibration transmission plate 121, which is beneficial to reduce the shaking of the magnetic circuit assembly 110 when vibrating in the vibration direction, and prevent the magnetic circuit assembly 110 from tilting.

[0094] In some implementations, as shown in FIG8 a, the second vibration transmission plate 122 may include 4 connecting rods, and the first vibration transmission plate 121 may include 3 connecting rods. In some implementations, as shown in FIG8 b, the second vibration transmission plate 122 may include 3 connecting rods, and the first vibration transmission plate 121 may include 2 connecting rods. In some implementations, as shown in FIG8 c, the second vibration transmission plate 122 may include 4 connecting rods, and the first vibration transmission plate 121 may include 2 connecting rods.

[0095] In some embodiments, the Young's modulus of the material constituting the second vibration transmission plate 122 can also be made greater than the Young's modulus of the material constituting the first vibration transmission plate 121, so that the hardness of the second vibration transmission plate 122 is greater than the hardness of the first vibration transmission plate 121, which is beneficial to reduce the shaking of the magnetic circuit assembly 110 when vibrating in the vibration direction, and at the same time prevent the magnetic circuit assembly 110 from tilting.

[0096] While the basic concepts have been described above, it will be apparent to those skilled in the art that the detailed disclosure is merely illustrative and does not limit this specification. Although not explicitly stated herein, various modifications, improvements, and revisions to this specification may be made by those skilled in the art. Such modifications, improvements, and revisions are suggested in this specification and remain within the spirit and scope of the exemplary embodiments of this specification.

Claims

1. A speaker, comprising: Support part, magnetic circuit assembly and positioning assembly, wherein, The magnetic circuit assembly is connected to the support portion through the positioning assembly, and the magnetic circuit assembly vibrates relative to the support portion; The positioning component includes two vibration transmission plates, which are spaced apart in the vibration direction of the magnetic circuit component, and two projections of the two vibration transmission plates along the vibration direction are symmetrical.

2. The loudspeaker according to claim 1, wherein The two vibration transmission plates include a first vibration transmission plate, the first vibration transmission plate includes a central area, an edge area and a connecting rod connecting the central area and the edge area, the connecting rod includes a first part connecting the central area, a second part connecting the edge area, and a third part located between the first part and the second part, and the width of the first part and the second part is greater than the width of the third part.

3. The loudspeaker according to claim 2, wherein: The number of the connecting rods is two, and the two connecting rods are symmetrical about the center of the first vibration transmission plate.

4. The loudspeaker according to claim 2 or 3, wherein the thickness of the connecting rod is in the range of 0.1 mm to 0.15 mm.

5. The loudspeaker according to claim 2 or 3, wherein the width of the third portion of the connecting rod is in the range of 0.2 mm to 0.66 mm.

6. The loudspeaker according to any one of claims 2 to 5, wherein the two vibration transmission plates further include a second vibration transmission plate, and the first vibration transmission plate and the second vibration transmission plate have a long axis direction and a short axis direction.

7. The loudspeaker according to claim 6, wherein the equivalent stiffness of the first vibration transmission plate and the second vibration transmission plate along the long axis direction is in the range of 7500 N / m-12500 N / m.

8. The loudspeaker according to claim 6, wherein the equivalent stiffness of the first vibration transmission plate and the second vibration transmission plate along the short axis direction is in the range of 15000 N / m-25000 N / m.

9. The loudspeaker according to claim 6, wherein the equivalent stiffness of the first vibration transmission plate and the second vibration transmission plate along the vibration direction is in the range of 1200 N / m-2000 N / m.

10. The loudspeaker according to claim 6, wherein the equivalent stiffness of the first vibration transmission plate and the second vibration transmission plate when flipped around the long axis direction is in the range of 0.05-0.15 N*m / rad.

11. The loudspeaker according to claim 6, wherein the equivalent flipping stiffness of the first vibration transmitting plate and the second vibration transmitting plate flipped around the short axis direction is in the range of 0.1-0.2 N*m / rad. 12 . The loudspeaker according to claim 6 , wherein two projections of the first vibration transmitting plate and the second vibration transmitting plate are symmetrical about the short axis direction. 13 . The loudspeaker according to claim 6 , wherein two projections of the first vibration transmitting plate and the second vibration transmitting plate are symmetrical about the long axis direction.

14. The loudspeaker according to claim 6, wherein two projections of the first vibration transmission plate and the second vibration transmission plate are centrally symmetrical.

15. The speaker according to claim 1, the magnetic circuit assembly comprises a first magnet, a magnetic conductive plate, a second magnet and a magnetic conductive cover arranged in sequence along the vibration direction, the vibration transmitting plate comprises a first vibration transmitting plate and a second vibration transmitting plate, the first vibration transmitting plate is located on the side of the first magnet away from the magnetic conductive plate, and the second vibration transmitting plate is located on the side of the magnetic conductive cover away from the second magnet.

16. The speaker according to claim 15, along the vibration direction, the distance between the two opposite sides of the first magnet and the first vibration transmission plate is not less than 0.9 mm, and the distance between the two opposite sides of the magnetic conductive cover and the second vibration transmission plate is not less than 0.9 mm.

17. The loudspeaker according to claim 15 or 16, wherein the magnetic circuit component drives the positioning component to vibrate, and the resonance peak frequency generated by the positioning component does not exceed 300 Hz.

18. The loudspeaker according to claim 2, wherein the vibration transmitting plate further comprises a second vibration transmitting plate, and the supporting portion comprises a housing and a first bracket and a second bracket for connecting the first vibration transmitting plate and the second vibration transmitting plate to the housing respectively; The edge area of ​​the first vibration transmission sheet is fixed on the first bracket, and the coil of the speaker is fixed on the first bracket; The edge area of ​​the second vibration transmission plate is fixed on the second bracket.

19. The loudspeaker according to claim 18, wherein the Young's modulus of the second vibration transmission plate is greater than the Young's modulus of the first vibration transmission plate.

20. The loudspeaker according to claim 2, wherein the edge area of ​​the first vibration transmission plate is in a circular ring shape, and the equivalent stiffness of the two vibration transmission plates in the extension direction of the connecting rod is in the range of 10000 N / m-20000 N / m.

21. The loudspeaker according to claim 2, wherein the edge area of ​​the first vibration transmission plate is in a circular ring shape, and the equivalent stiffness of the two vibration transmission plates in the vibration direction is in the range of 1200N / m-2000N / m.

22. The loudspeaker according to claim 2, wherein the edge area of ​​the first vibration transmission plate is in a circular ring shape, and the equivalent flipping of the two vibration transmission plates around the extension direction of the connecting rod is in the range of 0.1N*m / rad-0.15N*m / rad.

23. A loudspeaker, comprising: Support part, magnetic circuit assembly and positioning assembly, wherein, The magnetic circuit assembly is connected to the support portion via the positioning assembly, and the magnetic circuit assembly vibrates relative to the support portion; The positioning component comprises two vibration transmission plates, which are spaced apart in the vibration direction of the magnetic circuit component and are asymmetrically distributed between two projections of the two vibration transmission plates along the vibration direction.

24. The loudspeaker according to claim 23, wherein The two vibration transmission plates include a first vibration transmission plate and a second vibration transmission plate, the first vibration transmission plate and the second vibration transmission plate are respectively located on opposite sides of the magnetic circuit component, and the width of the connecting rod of the second vibration transmission plate is greater than the width of the connecting rod of the first vibration transmission plate.

25. The loudspeaker of claim 24, wherein: The thickness of the connecting rod of the second vibration transmission plate is smaller than the thickness of the connecting rod of the first vibration transmission plate.

26. A loudspeaker according to claim 24 or 25, wherein The number of connecting rods of the second vibration transmission plate is different from the number of connecting rods of the first vibration transmission plate.

27. The loudspeaker according to claim 26, wherein The number of connecting rods of the second vibration transmission plate is greater than the number of connecting rods of the first vibration transmission plate.

28. The loudspeaker according to claim 24, wherein the Young's modulus of the second vibration transmitting plate is greater than the Young's modulus of the first vibration transmitting plate.

29. The loudspeaker according to claim 24, wherein the magnetic circuit assembly comprises a first magnet, a magnetic conductive plate, a second magnet and a magnetic conductive cover arranged in sequence along the vibration direction, the first vibration transmission plate is located on a side of the first magnet away from the magnetic conductive plate, and the second vibration transmission plate is located on a side of the magnetic conductive cover away from the second magnet, wherein: Along the vibration direction, the distance between the two opposite side surfaces of the first magnet and the first vibration transmission plate is not less than 0.9 mm, and the distance between the two opposite side surfaces of the magnetic conductive cover and the second vibration transmission plate is not less than 0.9 mm.

30. The loudspeaker according to claim 24 or 29, wherein the magnetic circuit component drives the positioning component to vibrate, and the resonance peak frequency generated by the positioning component does not exceed 300 Hz.

31. A loudspeaker according to any one of claims 25-28, wherein in the vibration direction, the distance from the center of gravity of the magnetic circuit assembly to the second vibration transmission plate is smaller than the distance to the first vibration transmission plate.

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