Linear vibration exciter

Abstract

The invention relates to the technical field of exciters, in particular to a linear vibration exciter which comprises a shell, an elastic piece, a mass block and a vibration assembly. The shell forms a cavity for accommodating the mass block, and the elastic sheets are connected with the mass block and the shell, so that the mass block is erected in the shell; the vibration assembly is arranged in the shell and used for driving the mass block to reciprocate in the Z-axis direction in the shell. One end of the elastic piece is connected to the inner wall of the shell, and the other end of the elastic piece is connected with the side wall of the mass block after crossing the mass block and used for providing elastic force in the Z-axis direction. Compared with the prior art, by improving the structure of the elastic piece, the moment arm of the elastic piece is longer, so that the vibration stress of the elastic piece can be reduced, the stress concentration problem of the elastic piece is relieved, the elastic piece is matched with the mass block, the reciprocating motion in the Z-axis direction is achieved, and the vibration resistance of the elastic piece is improved. And the service life of the product is prolonged, and the vibration sense is also improved.

Description

Technical Field

[0001] The present invention relates to the technical field of exciters, and in particular to a linear vibration exciter. Background Art

[0002] A linear vibration actuator is a miniature vibration element that works based on electromagnetic or piezoelectric principles. It is widely used in the field of tactile feedback, such as in smartphones, game controllers, wearable devices, and the central control screen or steering wheel buttons of cars. When users touch the buttons or screens, they feel a vibration to enhance human perception. These actuators tend to be flatter as technology develops.

[0003] The working principle of the linear vibration exciter is based on the principle of electromagnetic induction. When the coil is energized, a magnetic field is generated, which interacts with the magnet to drive the internal components to vibrate linearly. In order to reduce the height of the exciter, the prior art often selects the exciter in the X-axis direction as the research and development object. However, the vibration along the direction of human finger touch is the strongest, and the vibration in the X-axis direction will be greatly reduced in human perception. Therefore, the exciter in the Z-axis direction is still the best choice for the current exciter.

[0004] In the prior art, a Chinese invention patent application with publication number CN106026603A disclosed on October 12, 2016 a linear vibration motor, which connects a mass block and a housing through a spring sheet to provide elastic force in the Z-axis direction. In order to solve the problem that the Z-axis linear vibration motor in the prior art is prone to polarization, the spring sheet is set to be S-shaped, reverse Z-shaped, or composed of two V-shaped vibration arms, and is symmetrically distributed on both sides of the mass block, so as to increase the vibration frequency of the vibration system and reduce the occurrence of polarization.

[0005] However, the inventors have found that in order to increase the vibration frequency, the above-mentioned Z-axis linear vibration motor has a shorter elastic arm, which makes the stress of the elastic arm, especially at the bending part, more concentrated, which easily causes fatigue fracture of the elastic arm. Summary of the invention

[0006] In view of at least one of the above technical problems, the present invention provides a linear vibration exciter, which adopts an improved elastic arm structure to reduce the problem of stress concentration and thus increase the overall life of the product.

[0007] According to a first aspect of the present invention, there is provided a linear vibration exciter, comprising: a housing, a spring, a mass block and a vibration assembly; The housing forms a cavity for accommodating the mass block, at least two spring sheets are provided, and the spring sheets connect the mass block and the housing so that the mass block is mounted in the housing; the vibration component is provided in the housing to drive the mass block to reciprocate in the Z-axis direction in the housing; One end of the spring sheet is connected to the inner wall of the shell, and the other end thereof crosses over the mass block and is connected to the side wall of the mass block, so as to provide elastic force in the Z-axis direction.

[0008] In some embodiments of the present invention, the spring piece comprises: A first vertical section, arranged vertically, for connecting with a side wall of the mass block; a first arc segment connected to the top of the first vertical segment; A first inclined section, connected to the first arc section and inclined in a direction away from the bottom of the first vertical section; A second arc segment connected to the first inclined segment and bent in an inclined direction opposite to the inclined segment; a second inclined segment connected to the second arc segment and extending in a direction tangent to the second arc segment; a third arc segment connected to the second inclined segment; A second vertical segment, arranged vertically and connected to the third arc segment, wherein the second vertical segment is used to connect to the inner wall of the housing; Wherein, the height of the bottom end of the first vertical section is higher than that of the bottom end of the second vertical section.

[0009] In some embodiments of the present invention, the widths of the first vertical segment and the second vertical segment are the same, the width of the middle portion of the first inclined segment is the smallest, the width of the spring sheet is gradually widened from the middle to both ends, and a smooth transition is made with an arc cutting line at least on the same side of the first arc segment, the second arc segment and the second inclined segment.

[0010] In some embodiments of the present invention, the first inclined section has an arc structure in the direction in which it extends.

[0011] In some embodiments of the present invention, there are two spring sheets, which are arranged on both sides of the mass block in a centrally symmetrical manner, and the spring sheets span the top surface and / or bottom surface of the mass block.

[0012] In some embodiments of the present invention, there are two spring sheets, and the two spring sheets are symmetrically arranged at two sides of the mass block; It also includes an elastic frame, which is located between the two elastic sheets. The elastic frame is formed by the two elastic sheets being butt-jointed side by side, and the two first inclined sections of the elastic sheets constituting the elastic frame are symmetrical arc structures in the direction in which they extend; One end of the elastic frame is fixed to the inner wall of the shell, and the other end is fixed to the mass block, and the connection point between the elastic frame and the mass block is located on the other side of the connection point between the spring sheet and the mass block.

[0013] In some embodiments of the present invention, a concave clearance groove may be provided on the surface of the mass block facing the spring sheet, and the shape of the clearance groove matches the shape of the spring sheet so that when the mass block vibrates, the spring sheet can extend into the clearance groove.

[0014] In some embodiments of the present invention, the mass block further has a central through hole extending through the mass block in the thickness direction; The vibration assembly includes a tubular magnetic steel coaxially fixed in the central through hole; The vibration assembly also includes a coil assembly fixed in the housing and inserted into the tubular magnetic steel, and the coil assembly generates an alternating magnetic field that interacts with the tubular magnetic steel when energized; The tubular magnetic steel drives the mass block to reciprocate in the Z-axis direction under the action of the alternating magnetic field.

[0015] In some embodiments of the present invention, the vibration assembly further comprises pole pieces fixed to both sides of the tubular magnetic steel, the pole pieces are provided with a central opening, and the inner diameter of the pole piece opening is smaller than the inner diameter of the tubular magnetic steel; The upper and lower surfaces of the mass block are both provided with mounting grooves for embedding the pole piece, and the depth of the mounting groove is not less than the thickness of the pole piece.

[0016] In some embodiments of the present invention, foam is fixed on both sides of the mass block in the vibration direction, the foam is attached to the pole piece, and the foam is configured to contact the shell and deform during the vibration of the mass block.

[0017] The beneficial effects of the present invention are as follows: the present invention improves the structure of the spring clip so that one end of the spring clip is connected to the inner wall of the shell, and the other end is connected to the side wall of the mass block after crossing the mass block. Compared with the prior art, the spring clip in the present invention has a longer force arm, thereby reducing the vibration stress of the spring clip and alleviating the problem of stress concentration in the spring clip. In addition, the present invention realizes reciprocating motion in the Z-axis direction by cooperating the spring clip with the mass block, thereby extending the service life of the product while also improving the vibration sense. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 Schematic diagram of the structure of the linear vibration exciter in the first embodiment of the present invention; Figure 2 In the first embodiment of the present invention Figure 1 Sectional view along AA direction; Figure 3 It is an exploded schematic diagram of a linear vibration exciter in Embodiment 1 of the present invention; Figure 4 It is a side view of the spring piece in the first embodiment of the present invention; Figure 5 Schematic diagram of the vibration state of the spring in the first embodiment of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the spring piece in the first embodiment of the present invention; Figure 7 Schematic diagram of the structure of the mass block in the first embodiment of the present invention; Figure 8 In the first embodiment of the present invention Figure 1 BB section view in (the upper cover of the shell is omitted); Fig. 9 A schematic diagram of an arrangement structure of spring pieces in the first embodiment of the present invention; Fig.10 This is a schematic diagram of another arrangement structure of a spring piece according to an embodiment of the present invention; Fig.11 It is a schematic diagram of the structure of the spring piece in the second embodiment of the present invention; Fig.12 It is a schematic diagram of explosion and decomposition of the connection between the spring piece and the mass block in the second embodiment of the present invention; Fig.13 Schematic diagram of the connection structure between the spring piece and the mass block in the second embodiment of the present invention; Fig.14 It is a schematic diagram of the arrangement structure of the spring piece and the elastic frame in the third embodiment of the present invention; Fig.15 It is a schematic diagram of the connection structure between the spring piece, the elastic frame and the mass block in the third embodiment of the present invention.

[0020] Explanation of the reference numerals: 1. Shell; 2. Spring piece; 20. Elastic frame; 21. First vertical section; 22. First arc section; 23. First inclined section; 24. Second arc section; 25. Second inclined section; 26. Third arc section; 27. Second vertical section; 3. Mass block; 31. Gap groove; 32. Center through hole; 33. Mounting groove; 4. Vibration assembly; 41. Tubular magnet; 42. Coil assembly; 43. Pole piece; 5. Foam. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0024] Embodiment 1 like Figures 1 to 10 The linear vibration exciter shown in the figure comprises a housing 1, a spring 2 and a mass block 3, wherein Figure 1 and Figure 2 As shown in the figure, the shell 1 forms a cavity for accommodating the mass block 3, and at least two spring pieces 2 are provided, which connect the mass block 3 and the shell 1, so that the mass block 3 is mounted in the shell 1; the vibration component 4 is arranged in the shell 1, and is used to drive the mass block 3 to reciprocate in the Z-axis direction in the shell 1; wherein one end of the spring piece 2 is connected to the inner wall of the shell 1, and the other end crosses the mass block 3 and is connected to the side wall of the mass block 3, so as to provide elastic force in the Z-axis direction. It should be noted here that the Z-axis direction is the thickness direction of this product, such as Figure 3 The coordinate axis is shown.

[0025] Specifically, in an embodiment of the present invention, the shell 1 is the external structure of the product, which plays the role of protection, fixing and support, and provides a closed space for the mass block 3 to move. There are at least two spring clips 2. On the one hand, the spring clip 2 is responsible for connecting the mass block 3 to the shell 1. The leaping spring clip 2 helps to provide a more stable and linear elastic force. On the other hand, it is used to guide the reciprocating motion of the mass block 3 along the Z-axis direction. The vibration component 4 can be driven by electromagnetic force, piezoelectric effect or other mechanical methods. When the vibration component 4 drives the mass block 3 to move, the elastic force provided by the spring clip 2 can help restore the mass block 3 to the initial position, thereby achieving periodic vibration. Through the combination of the spring clip 2 and the vibration component 4, the stable linear vibration of the mass block 3 in the shell 1 is achieved. The leaping design of the spring clip 2 not only simplifies the structure, but also provides good motion control and mechanical response for the device, improves the vibration control accuracy of the product, and thus prolongs the service life.

[0026] In the above embodiment, by improving the spring structure, one end of the spring is connected to the inner wall of the shell, and the other end is connected to the side wall of the mass block after crossing the mass block. Compared with the prior art, the spring in the present invention has a longer force arm, which can reduce the vibration stress of the spring and alleviate the problem of stress concentration in the spring. In addition, the present invention realizes reciprocating motion in the Z-axis direction by cooperating the spring with the mass block, thereby extending the service life of the product and improving the vibration sense.

[0027] On the basis of the above embodiments, in some embodiments of the present invention, the specific structure of the spring piece 2 is as follows: Figure 4 As shown in the figure, the spring piece 2 includes a first vertical section 21, a first arc section 22, a first inclined section 23, a second arc section 24, a second inclined section 25, a third arc section 26 and a second vertical section 27 in the direction of its extension; wherein the first vertical section 21 is vertically arranged for connecting with the side wall of the mass block 3; the first arc section 22 is connected to the top of the first vertical section 21; the first inclined section 23 is connected to the first arc section 22 and is inclined in a direction away from the bottom of the first vertical section 21. The second arc segment 24 is connected to the first inclined segment 23 and is bent in an inclined direction opposite to the inclined segment; the second inclined segment 25 is connected to the second arc segment 24 and extends in a direction tangent to the second arc segment 24; the third arc segment 26 is connected to the second inclined segment 25; the second vertical segment 27 is vertically arranged and connected to the third arc segment 26, and the second vertical segment 27 is used to connect to the inner wall of the housing 1; wherein the height of the bottom end of the first vertical segment 21 is higher than the bottom end of the second vertical segment 27.

[0028] Specific as Figure 4As shown in , the first vertical section 21 fixes the spring 2 to the mass block 3, provides a stable connection point, and bears the force transmitted from the movement of the mass block 3. The first arc section 22 is located at the top of the first vertical section 21 and is directly connected to it; the arc structure can buffer stress concentration and provide elastic deformation ability to adapt to the movement requirements of the mass block 3 during vibration. The first inclined section 23 is connected to the first arc section 22 and is inclined in the direction away from the bottom of the first vertical section 21; by changing the direction, the stress is further dispersed and the spring 2 is guided to extend in the direction away from the first vertical section 21, providing support for the subsequent sections. The second arc section 24 is connected to the first inclined section 23 and bends in the opposite direction to the first inclined section 23; this setting enhances the nonlinear elastic response ability of the spring 2 and provides a symmetry, which can increase stability during vibration. The second inclined section 25 is connected to the second arc section 24 and extends in a direction tangent to the second arc section 24; through a smooth transition, the arc change of the previous section is gradually transitioned to a straight extension, which helps to avoid stress concentration at the bending transition. The third arc segment 26 is connected to the second inclined segment 25; as an important middle segment for connecting the shrapnel 2 to the inner wall of the housing 1, its shape adapts to the movement mode of the vibration component 4, while continuing to play the role of buffering and flexible connection. The second vertical segment 27 is vertically arranged, connected to the third arc segment 26, and directly connected to the inner wall of the housing 1; the second vertical segment 27 provides an end point for the overall structure of the shrapnel 2 through a fixed connection with the inner wall of the housing 1, ensuring that the shrapnel 2 can stably support the vibration of the mass block 3. The bottom end height of the first vertical segment 21 is higher than the bottom end of the second vertical segment 27. The height difference design optimizes the mechanical properties of the shrapnel 2 during movement, ensuring that the movement of the mass block 3 is always in a specific direction; starting points at different heights can share the stress load during the vibration process to prevent premature fatigue or damage of the shrapnel 2.

[0029] This product can reduce stress by increasing the force arm perpendicular to the Z axis. This setting has a simple structure, low manufacturing cost, easy installation, long force arm, low stress concentration during vibration, and can increase the overall life of the product. And compared with traditional elastic sheets, such as Figure 5 As shown in the figure, during the reciprocating vibration of the mass block 3, the stress points of the spring piece 2 are dispersed, that is, the first arc segment 22, the second arc segment 24 and the third arc segment 25 are all subjected to stress, thereby further dispersing the stress and improving the service life of the spring piece 2.

[0030] In order to further optimize the spring piece 2, as Figure 6As shown in , in the embodiment of the present invention, the first vertical section 21 and the second vertical section 27 have the same width, the width of the middle of the first inclined section 23 is the smallest, the width of the spring piece 2 is gradually widened from the middle to both ends, and at least on the same side of the first arc section 22, the second arc section 24 and the second inclined section 25, the arc cutting line smoothly transitions. Figure 6 As shown, the vertical sections at both ends of the spring 2 have the same width, which enables the vertical sections to bear the weight of the mass block 3 and the force transmitted by vibration more evenly, ensuring the symmetry and stability of the vibration. The width of the spring 2 is narrowed in the middle of the first inclined section 23 to form the narrowest part of the structure; the flexibility of this area is increased, so that the spring 2 can produce more elastic deformation here, reduce stress concentration during dynamic use, and avoid cracks or excessive wear in other sensitive areas. The widened design at both ends of the spring 2 enhances the strength of the connection area of ​​the spring 2 to prevent breakage or deformation during vibration. On the same side of the first arc section 22, the second arc section 24 and the second inclined section 25, there is an arc cutting line to make the width transition smoother; the smooth arc transition eliminates the stress concentration caused by the sudden change in width, ensuring that the spring 2 can evenly distribute stress when subjected to force, and prolonging the service life. The width change of the spring 2 gives it a differentiated stiffness and flexible area, which can better adapt to the dynamic movement requirements of the mass block 3 during vibration.

[0031] In the embodiment of the present invention, in order to further increase the vibration space of the mass block 3 within the limited space in the housing 1, as Figures 7 to 9 As shown in , a recessed groove 31 may be provided on the surface of the mass block 3 facing the spring sheet 2, and the shape of the recess 31 matches the shape of the spring sheet 2, so that when the mass block 3 vibrates, the spring sheet 2 can extend into the recess 31. Figure 7As shown, the clearance groove 31 is a concave structure on the surface of the mass block 3 facing the spring sheet 2. When the spring sheet 2 vibrates with the mass block 3, a reserved space is provided for the movement trajectory of the spring sheet 2 to avoid the spring sheet 2 from physically colliding with the mass block 3 due to the large vibration amplitude. The shape of the clearance groove 31 matches the shape of the spring sheet 2, and can be a straight line, arc, inclined, and other structural types. During the use of this product, the spring sheet 2 will produce a certain deformation during the vibration process. If there is no reserved space, it may cause the spring sheet 2 to collide with the mass block 3. The setting of the clearance groove 31 provides a space for free movement, avoids interference, and ensures the smoothness of vibration. At the same time, the clearance groove 31 also helps the exciter to output vibration energy in a wider range and improve the working performance of the device; avoids direct contact between the spring sheet 2 and the mass block 3, plays a certain buffering role, avoids excessive stress impact during the vibration process, reduces material wear caused by friction and impact, and extends the service life of the spring sheet 2 and the mass block 3. During the production process, the groove wall of the clearance groove 31 can be polished or coated to reduce possible friction; for the possible contact area, wear-resistant materials or strengthening processes are used to extend the service life.

[0032] In the embodiment of the present invention, the specific structure of the vibration component 4 is as follows: Figure 8 As shown in the figure, the mass block 3 also has a central through hole 32 that is arranged to penetrate along the thickness direction; the vibration component 4 includes a tubular magnetic steel 41 coaxially fixed in the central through hole 32; and also includes a coil component 42 fixed in the shell 1 and inserted into the tubular magnetic steel 41. When the coil component 42 is energized, an alternating magnetic field that interacts with the tubular magnetic steel 41 is generated; under the action of the alternating magnetic field, the tubular magnetic steel 41 drives the mass block 3 to reciprocate in the Z-axis direction.

[0033] like Figure 8 As shown in , the center through hole 32 provides precise positioning and installation position, so that the tubular magnet 41 and the mass block 3 remain coaxial. When the tubular magnet 41 is installed, it can be fixed in the center through hole 32 by clearance fit. After the coil assembly 42 is energized, an alternating magnetic field is generated, which interacts with the tubular magnet 41 to form a driving force. The direction of the alternating magnetic field is aligned with the axial direction of the magnet to ensure that the driving force is along the Z-axis. Due to the coaxial design of the magnet and the mass block 3, and the elastic guidance of the shrapnel 2, the vibration direction of the system is highly stable and the offset is small. In addition, the electromagnetic drive in the system has no direct mechanical contact, which reduces wear, extends the service life, and reduces maintenance costs.

[0034] In order to further improve the magnetic field focusing effect of the tubular magnetic steel 41, in an embodiment of the present invention, the vibration component 4 also includes a pole piece 43 fixed on both sides of the tubular magnetic steel 41, the pole piece 43 is provided with a central opening, and the inner diameter of the opening of the pole piece 43 is smaller than the inner diameter of the tubular magnetic steel 41; the upper and lower surfaces of the mass block 3 are provided with mounting grooves 33 for embedding the pole piece 43, and the depth of the mounting groove 33 is not less than the thickness of the pole piece 43.

[0035] In the above embodiment, the pole piece 43 is fixed on both sides of the tubular magnetic steel 41, in planar contact with the tubular magnetic steel 41, and constitutes a part of the magnetic circuit as a whole. The opening smaller than the inner diameter of the tubular magnetic steel 41 limits the distribution range of the magnetic field, optimizes the distribution of the magnetic field inside and outside the tubular magnetic steel 41, and improves the efficiency of the vibration component 4. The mounting groove 33 provides an installation position for the pole piece 43 to ensure that the pole piece 43 will not be displaced or loosened during the vibration process. After the pole piece 43 is embedded, the surface of the mass block 3 remains flat, and the movement or assembly of other components will not be affected by the presence of the pole piece 43. The setting of this pole piece 43 improves the mechanical stability of the vibration component 4, extends the service life of the equipment, and also helps to limit the direction of action of the electromagnetic force, ensuring that the vibration of the mass block 3 mainly occurs in the Z-axis direction, avoiding interference with the vibration accuracy due to forces in other directions.

[0036] On the basis of the above embodiment, foam 5 is fixed on both sides of the mass block 3 in the vibration direction, the foam 5 is attached to the pole piece 43, and the foam 5 is configured to contact with the housing 1 and deform during the vibration of the mass block 3. Figure 8 , the foam 5 is tightly combined with the pole piece 43 by pasting or other fixing methods, and becomes a part of the mass block 3, which does not affect the magnetic field optimization function of the pole piece 43, and provides additional protection and buffering for the system. In an embodiment of the present invention, the foam 5 is compressed and deformed during the vibration of the mass block 3. After the electrical signal is interrupted, the residual energy in the vibration can be consumed by this deformation, so that the vibration can be quickly stopped. In the production process, the material of the foam 5 can be selected from polyurethane foam 5, silicone rubber foam 5 and memory foam 5, etc. The foam 5 is integrated with the mass block 3 to effectively buffer the vibration impact, reduce noise and extend the life of the equipment, thereby optimizing the performance of the vibration system. In addition, it should be pointed out here that in an embodiment of the present invention, the shell 1 includes a bottom shell and an upper shell, which are connected by welding or snap-fitting, etc., and will not be introduced in detail here.

[0037] In the embodiment of the present invention, the arrangement of the spring piece 2 is as follows: Figures 9 and 10 As shown in FIG. , there are two spring pieces 2, which are arranged on both sides of the mass block 3 in a centrally symmetrical manner; in the embodiment of the present invention, as shown in FIG. Fig. 9 As shown in FIG. , the spring sheet 2 can be arranged to span the top surface of the mass block 3, that is, Fig. 9As shown in the figure, the upper part of the left spring piece 2 is fixedly connected to the mass block 3, and the lower part of the right spring piece 2 is connected to the mass block; of course, those skilled in the art can also set it to a structural form in which the spring pieces 2 all span the bottom of the mass block 3; in addition, as Fig.10 As shown in , the spring pieces 2 can also be arranged in a spatially centrally symmetrical structure, that is, one is arranged below the mass block and the other is arranged above the mass block.

[0038] Embodiment 2 This embodiment also proposes a linear vibration exciter. The second embodiment is a further improvement on the first embodiment. In the second embodiment of the present invention, the structure of the spring 2 is improved. The connection relationship between the remaining housing, mass block, and vibration assembly is the same as that of the first embodiment, and will not be repeated here. In the second embodiment of the present invention, the first inclined section 23 is an arc structure in the direction in which it extends. Fig.11 As shown, the arc can be a single bend, such as a circular arc, or a more complex curve, such as a gradient arc, and the selection should be based on specific usage requirements. The arc structure can disperse the stress concentration points of the spring 2 during the dynamic movement process, especially the force transmitted to the spring 2 when the mass block 3 vibrates, which is more evenly distributed on the curvature of the arc, reducing the possibility of fatigue damage to the spring 2 under high-frequency vibration. In addition, the arc design is more suitable for the flow of force, making the movement more concentrated along a specific direction (such as the Z axis) and reducing the lateral component of the force.

[0039] like Fig.11 The figure shows a schematic diagram of the structure of the spring piece 2 arranged centrally and symmetrically on a plane. The centrally symmetrical spring piece 2 pulls the mass block 3 together to make up and down reciprocating motions during the vibration process, and at the same time plays a role in stabilizing the vibration mode and preventing the mass block 3 from twisting significantly. The spring piece 2 has a small bending stiffness at two locations, and is prone to deformation during the vibration process, so that the spring piece 2 is not tight as a whole, thereby releasing most of the stress and alleviating the stress concentration phenomenon. Of course, it should be pointed out here that there are many other arrangements of the spring piece 2, and those skilled in the art can refer to the layout of the spring piece 2 in the first embodiment for understanding, and will not be repeated here.

[0040] like Fig.13 As shown, the clearance groove 31 opened on the mass block 3 is arranged in a conformal manner with the spring piece 2. Through the arrangement of this conformal structure, the vibration stability of the mass block 3 can be further improved and its polarization in other directions can be reduced.

[0041] The lateral arc shape enables the spring piece 2 to evenly disperse stress when subjected to force, avoiding stress concentration in certain local areas. The arc shape gives the spring piece 2 a larger elastic deformation space, which can provide a more linear and controllable restoring force when the mass block 3 moves significantly, thereby enhancing the smoothness and accuracy of the vibration exciter in the Z-axis direction.

[0042] Embodiment 3 This embodiment also proposes a linear vibration exciter. The third embodiment is an improvement based on the second embodiment, and also improves the structure of the spring 2. Specifically, Fig.14 and Fig.15 As shown in , in the third embodiment of the present invention, there are two spring pieces 2, and the two spring pieces 2 are symmetrically arranged at two sides of the mass block 3; The elastic frame 20 is also included. The elastic frame 20 is located between the two elastic sheets 2. The elastic frame 20 is formed by two elastic sheets 2 connected side by side. The two first inclined sections 23 of the elastic sheets 2 constituting the elastic frame 20 are symmetrical arc structures in the direction in which they extend. One end of the elastic frame 20 is fixed on the inner wall of the housing 1 , and the other end is fixed on the mass block 3 , and the connection point between the elastic frame 20 and the mass block 3 is located on the other side of the connection point between the spring sheet 2 and the mass block 3 .

[0043] In this embodiment, the connection relationship between the spring piece 2 and the mass block 3, and other components is the same as that in the above embodiment, so in the following part, only the structure of other parts and the connection relationship involved are described.

[0044] like Fig.14 and Fig.15 As shown, the elastic frame 20, as an independent elastic component, not only provides single-point support for the spring 2, but also achieves better flexible connection and dynamic adaptability through the overall structure. The symmetrical arc design enhances the symmetry of the structure, so that the vibration exciter exhibits better dynamic balance during operation. The elastic frame 20 can provide stable and flexible support for the mass block 3 through the symmetrical arc structure and the double spring 2. During the vibration process, the elastic frame 20 will absorb part of the kinetic energy and restore the original shape through elastic deformation, thereby achieving a smooth vibration effect. In addition, the lateral component during vibration is also balanced to ensure that the mass block 3 moves along a predetermined direction (such as the Z axis), which can effectively reduce the deflection of the mass block 3 during the vibration process and improve the reliability of the vibration system.

[0045] It should be understood that the provision of the elastic frame 20 can effectively reduce the influence of slight rotation caused by the torque during the vibration process. This structure can better offset the resultant force during the vibration process to achieve a more stable vibration effect.

[0046] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A linear vibration exciter, characterized in that: It includes a housing, a spring, a mass block and a vibration component; The housing forms a cavity for accommodating the mass block, at least two spring sheets are provided, and the spring sheets connect the mass block and the housing so that the mass block is mounted in the housing; the vibration component is provided in the housing to drive the mass block to reciprocate in the Z-axis direction in the housing; One end of the spring sheet is connected to the inner wall of the shell, and the other end thereof crosses over the mass block and is connected to the side wall of the mass block, so as to provide elastic force in the Z-axis direction.

2. The linear vibration exciter according to claim 1, characterized in that: The shrapnel comprises: A first vertical section, arranged vertically, for connecting with a side wall of the mass block; a first arc segment connected to the top of the first vertical segment; A first inclined section, connected to the first arc section and inclined in a direction away from the bottom of the first vertical section; A second arc segment connected to the first inclined segment and bent in an inclined direction opposite to the inclined segment; a second inclined segment connected to the second arc segment and extending in a direction tangent to the second arc segment; a third arc segment connected to the second inclined segment; A second vertical segment, arranged vertically and connected to the third arc segment, wherein the second vertical segment is used to be connected to the inner wall of the housing; Wherein, the height of the bottom end of the first vertical section is higher than that of the bottom end of the second vertical section.

3. The linear vibration exciter according to claim 2, characterized in that: The width of the first vertical section and the second vertical section is the same, the width of the middle part of the first inclined section is the smallest, the width of the spring sheet is gradually widened from the middle to both ends, and at least on the same side of the first arc section, the second arc section and the second inclined section, a smooth transition is made with an arc cutting line.

4. The linear vibration exciter according to claim 3, characterized in that: The first inclined section is in an arc structure in the direction in which it extends.

5. The linear vibration exciter according to any one of claims 2 to 4, characterized in that: There are two spring sheets, which are arranged on both sides of the mass block in a centrally symmetrical manner, and the spring sheets span the top surface and / or bottom surface of the mass block.

6. The linear vibration exciter according to claim 3, characterized in that: There are two spring sheets, which are symmetrically arranged on both sides of the mass block; It also includes an elastic frame, which is located between the two elastic sheets. The elastic frame is formed by the two elastic sheets being butt-jointed side by side, and the two first inclined sections of the elastic sheets constituting the elastic frame are symmetrical arc structures in the direction in which they extend; One end of the elastic frame is fixed to the inner wall of the shell, and the other end is fixed to the mass block, and the connection point between the elastic frame and the mass block is located on the other side of the connection point between the spring sheet and the mass block.

7. The linear vibration exciter according to claim 1, characterized in that: A concave clearance groove may be provided on the surface of the mass block facing the spring sheet, and the shape of the clearance groove matches the shape of the spring sheet, so that when the mass block vibrates, the spring sheet can extend into the clearance groove.

8. The linear vibration exciter according to claim 1, characterized in that: The mass block also has a central through hole extending through the mass block in the thickness direction; The vibration assembly includes a tubular magnetic steel coaxially fixed in the central through hole; The vibration assembly also includes a coil assembly fixed in the housing and inserted into the tubular magnetic steel, and the coil assembly generates an alternating magnetic field that interacts with the tubular magnetic steel when energized; The tubular magnetic steel drives the mass block to reciprocate in the Z-axis direction under the action of the alternating magnetic field.

9. The linear vibration exciter according to claim 8, characterized in that: The vibration assembly also includes pole pieces fixed to both sides of the tubular magnetic steel, the pole pieces are provided with a central opening, and the inner diameter of the pole piece opening is smaller than the inner diameter of the tubular magnetic steel; The upper and lower surfaces of the mass block are both provided with mounting grooves for embedding the pole piece, and the depth of the mounting groove is not less than the thickness of the pole piece.

10. The linear vibration exciter according to claim 9, characterized in that: Foam is also fixed on the two surfaces of the mass block in the vibration direction. The foam is attached to the pole piece, and the foam is configured to contact with the shell and deform during the vibration of the mass block.

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