Motion shock suppression system based on voice coil motor actuation and photographic lens

Abstract

This invention relates to the field of photography technology and provides a motion impact suppression system and photographic lens based on a voice coil motor actuation. The system includes: a housing assembly; a guide assembly disposed inside the housing assembly, with a first guide shaft and a second guide shaft symmetrically arranged on both sides of the housing assembly; a member to be protected, sleeved on the first and second guide shafts; a baffle assembly detachably connected to one end of the housing assembly; a first buffer member assembled on the side of the baffle assembly facing the member to be protected; and a second buffer member arranged axially between the member to be protected and the baffle assembly, along with the first buffer member. The first buffer member is used to elastically deform when the member to be protected is impacted to form a primary buffer, and the second buffer member is used to elastically deform together with the first buffer member to form a secondary buffer, thereby forming a graded buffer protection for the member to be protected, significantly improving buffering efficiency.

Description

Technical Field

[0001] This invention relates to the field of photography technology, and in particular to a motion shock suppression system and photographic lens based on voice coil motor actuation. Background Technology

[0002] In the fields of camera lenses, optical modules and related precision equipment, internal precision optical components (such as lens groups, sensors, etc.) are easily subjected to vibration and impact during use, assembly and drop. In order to prevent the above components from being displaced, collided or structurally damaged due to external impact, a buffer structure is usually set inside the equipment to absorb impact energy and protect the precision optical components.

[0003] Currently, most lenses employ a single-stage buffer structure. However, this single-stage buffer structure has several inherent flaws in practical applications and is no longer sufficient to meet increasingly stringent usage requirements. On the one hand, a single-stage buffer structure absorbs all impact energy at once, failing to provide tiered energy absorption based on the magnitude of the impact energy. Furthermore, its energy absorption curve is fixed and uniform, making it poorly adaptable to impact conditions of different magnitudes and frequencies. In some impact scenarios, it is prone to insufficient energy absorption efficiency and excessive deformation due to external forces, leading to structural damage or performance degradation. On the other hand, when subjected to severe impacts exceeding its own bearing capacity, the single-stage buffer structure is prone to failure. After failure, there is no subsequent protective structure to absorb the remaining impact energy, leaving the lens's internal precision components unprotected and significantly increasing the risk of equipment damage. In addition, the single-stage buffer structure struggles to simultaneously address the buffering and protection needs of minor vibrations and severe impacts. For minor vibrations encountered in daily use, it is prone to redundant buffering response or excessive rigidity. Conversely, when faced with sudden severe impacts, it suffers from insufficient energy absorption and limited protective effect, failing to achieve stable buffering protection under all operating conditions. Summary of the Invention

[0004] The purpose of this invention is to provide a motion shock suppression system and camera lens based on voice coil motor actuation, which aims to solve the technical problems of insufficient efficiency in absorbing impact energy by a single buffer structure in the prior art and the inability to absorb impact energy of different magnitudes in stages.

[0005] In a first aspect, the present invention provides a motion shock suppression system based on voice coil motor actuation, the motion shock suppression system based on voice coil motor actuation comprising:

[0006] Housing assembly;

[0007] A guide assembly, disposed inside the housing assembly, includes a first guide shaft and a second guide shaft, the first guide shaft and the second guide shaft being symmetrically disposed on both sides of the housing assembly;

[0008] The component to be protected is sleeved on the first guide shaft and the second guide shaft, and moves along the axial direction of the first guide shaft and the second guide shaft;

[0009] A baffle assembly is detachably connected to one end of the housing assembly and fixedly connected to the guide assembly;

[0010] A first buffer is assembled on the side of the baffle assembly facing the member to be protected, and is disposed between the member to be protected and the baffle assembly;

[0011] The second buffer is arranged sequentially with the first buffer along the axial direction between the member to be protected and the baffle assembly, and is located on the side of the first buffer closer to the member to be protected;

[0012] The first buffer is used to undergo elastic deformation to form a primary buffer when the component to be protected is subjected to an impact. The second buffer is used to intervene before the first buffer fails or before the compression of the first buffer reaches a preset threshold, and together with the first buffer, undergoes elastic deformation to form a secondary buffer, thereby forming a graded buffer protection for the component to be protected.

[0013] In some embodiments, the components to be protected are provided with a first through hole and a second through hole on both sides, the first guide shaft passes through the first through hole, and the second guide shaft passes through the second through hole.

[0014] In some embodiments, the motion shock suppression system based on voice coil motor actuation includes a plurality of first buffers, each of which is a strip-shaped structure, and the plurality of first buffers are distributed at circumferential intervals along the baffle assembly.

[0015] In some embodiments, the motion impact suppression system based on voice coil motor actuation includes a plurality of second buffers, each of which has a ring-shaped structure. The plurality of second buffers are respectively sleeved on the first guide shaft and the second guide shaft, and one side of each second buffer abuts against the baffle assembly.

[0016] In some embodiments, the baffle assembly has a recessed groove on the side facing the member to be protected, the shape of the recessed groove being adapted to the shape of the first buffer member, the first buffer member being fitted into the recessed groove and partially protruding from the opening of the recessed groove.

[0017] In some embodiments, the baffle assembly is further provided with a first positioning groove and a second positioning groove, the first guide shaft is fixed to the first positioning groove, and the second guide shaft is fixed to the second positioning groove.

[0018] In some embodiments, under normal operating conditions, when the component to be protected is subjected to a minor impact, the first buffer comes into contact with the component to be protected and undergoes elastic deformation to form a primary buffer.

[0019] In some embodiments, when the first buffer forms a primary buffer, the original length and compression amount of the first buffer satisfy the following relationship:

[0020] 0.1L1≤△L1≤0.4L1;

[0021] Where L1 represents the original length of the first buffer, and ΔL1 represents the compression amount of the first buffer.

[0022] In some embodiments, when the first buffer forms a primary buffer, the elastic modulus of the first buffer satisfies the following relationship:

[0023] 2.5×M×△V1 / (A1×△t1)≤E1≤10×M×△V1 / (A1×△t1)

[0024] Where M represents the mass of the component to be protected, ΔV1 represents the velocity change value of the component to be protected under normal operating conditions, A1 represents the cross-sectional area of ​​the first buffer, Δt1 represents the time required for the velocity change ΔV1 of the component to be protected, and E1 represents the elastic modulus of the first buffer.

[0025] In some embodiments, under severe impact conditions, when the component to be protected is subjected to severe impact, the first buffer component comes into contact with the component to be protected and undergoes elastic deformation to form a primary buffer. The second buffer component intervenes before the first buffer component fails or before the compression of the first buffer component reaches a preset threshold, and together with the first buffer component undergoes elastic deformation to form a secondary buffer.

[0026] In some embodiments, when the second buffer and the first buffer undergo elastic deformation together to form a secondary buffer, the original length and compression amount of the second buffer satisfy the following relationship:

[0027] 0.5×L2≤△L2≤0.8×L2;

[0028] Where L2 represents the original length of the second buffer, and ΔL2 represents the compression amount of the second buffer.

[0029] In some embodiments, when the second buffer and the first buffer undergo elastic deformation together to form a secondary buffer, the elastic modulus of the second buffer satisfies the following relationship:

[0030] (25×M×△V2-21×E1×A1×△t2) / (20×A1×△t2) ≤E2≤(10×M×△V2-6×E1×A1×△t2) / (5×A1×△t2);

[0031] Where M represents the mass of the component to be protected, ΔV2 represents the velocity change of the component to be protected under severe impact conditions, E1 represents the elastic modulus of the first buffer, A1 represents the cross-sectional area of ​​the first buffer, E2 represents the elastic modulus of the second buffer, and Δt2 represents the time required for the second buffer to start acting until the velocity of the component to be protected drops to zero.

[0032] Secondly, the present invention provides a photographic lens, including a lens barrel and a motion shock suppression system based on a voice coil motor actuation as described above, wherein the motion shock suppression system based on a voice coil motor actuation is disposed inside the lens to provide buffer protection for the component to be protected.

[0033] This invention achieves graded absorption of impact energy by sequentially arranging a first buffer and a second buffer along the axial direction between the component to be protected and the baffle assembly. When the component to be protected is impacted, the first buffer undergoes elastic deformation first to achieve primary buffering. Before the first buffer fails or its compression reaches a preset threshold, the second buffer intervenes and deforms together with the first buffer to form secondary buffering. This makes the energy absorption curve smoother and can simultaneously meet the buffering needs of minor vibrations and severe impacts, significantly improving buffering efficiency and adaptability to operating conditions. In addition, the first and second buffers form redundant protection. Even if the first buffer undergoes overload deformation or failure, the second buffer can still independently bear the subsequent impact protection, effectively avoiding direct damage to the component to be protected due to the failure of a single buffer structure. This significantly improves the impact resistance of the component to be protected and further extends the service life of the camera lens. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the motion shock suppression system based on voice coil motor actuation provided in an embodiment of the present invention;

[0035] Figure 2 This is an exploded view of the motion impact suppression system based on voice coil motor actuation provided in an embodiment of the present invention;

[0036] Figure 3 This is a cross-sectional view of the motion shock suppression system based on voice coil motor actuation provided in an embodiment of the present invention;

[0037] Figure 4 This is a structural schematic diagram of the component to be protected provided in an embodiment of the present invention;

[0038] Figure 5This is a schematic diagram of the baffle assembly provided in an embodiment of the present invention;

[0039] Figure 6 This is a schematic diagram of the structure of the primary buffer component provided in an embodiment of the present invention;

[0040] Figure 7 This is a schematic diagram of the structure of the secondary buffer component provided in an embodiment of the present invention. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0042] It should be understood that, when used in this specification and the appended claims, the term "comprising" indicates the presence of the described feature, integral, step, operation, element, and / or component, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof. Furthermore, the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise. The terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Words such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships, which may change accordingly when the absolute position of the described object changes.

[0043] To keep the following description of the embodiments of the present invention clear and concise, detailed descriptions of some known functions and known components are omitted in this specification.

[0044] This invention provides a motion shock suppression system based on voice coil motor actuation, please refer to the following: Figures 1 to 3The buffer structure 1 includes a housing assembly 10, a guide assembly 20, a member to be protected 30, a baffle assembly 40, a first buffer member 50, and a second buffer member 60. The guide assembly 20 is disposed inside the housing assembly 10 and includes a first guide shaft 21 and a second guide shaft 22, which are symmetrically arranged on both sides of the housing assembly 10. The member to be protected 30 is sleeved on the first guide shaft 21 and the second guide shaft 22 and moves axially along the first guide shaft 21 and the second guide shaft 22. The baffle assembly 40 is detachably connected to one end of the housing assembly 10 and fixedly connected to the guide assembly 20. The first buffer member 50 is assembled onto the baffle assembly 40. The first buffer 60 is positioned on the side facing the component 30 to be protected and between the component 30 to be protected and the baffle assembly 40; the second buffer 60 and the first buffer 50 are arranged axially between the component 30 to be protected and the baffle assembly 40, and are positioned on the side of the first buffer 50 close to the component 30 to be protected; wherein, the first buffer 50 is used to undergo elastic deformation to form a first-level buffer when the component 30 to be protected is impacted, and the second buffer 60 is used to intervene before the first buffer 50 fails or before the compression of the first buffer 50 reaches a preset threshold, and together with the first buffer 50 undergoes elastic deformation to form a second-level buffer, thereby forming a graded buffer protection for the component 30 to be protected.

[0045] This invention achieves graded absorption of impact energy by sequentially arranging a first buffer and a second buffer along the axial direction between the component to be protected and the baffle assembly. This results in a smoother energy absorption curve, simultaneously addressing the buffering needs of both minor vibrations and severe impacts. It significantly improves buffering efficiency and adaptability to different operating conditions, and effectively prevents direct damage to the component to be protected due to the failure of a single buffer structure. This significantly enhances the impact resistance of the component to be protected and further extends the service life of the camera lens.

[0046] In some embodiments, the housing assembly 10 is a hollow cylindrical structure with an axially extending internal accommodating cavity for accommodating the guide assembly 20, the member to be protected 30, the first buffer 50, and the second buffer 60. The inner walls on both sides of the housing assembly 10 are symmetrically provided with mounting grooves for fixing the guide assembly 20. The mounting grooves extend axially along the housing assembly. A connecting hole is provided on the inner sidewall of the housing assembly 10 with one open end for detachable connection with the baffle assembly 40, while the other open end connects to the outside.

[0047] In some embodiments, the guide assembly 20 is disposed inside the housing assembly 10. The guide assembly 20 includes a first guide shaft 21 and a second guide shaft 22, both of which are cylindrical long rod structures. The first guide shaft 21 and the second guide shaft 22 are symmetrically and parallelly arranged on both sides of the housing assembly 10. The length of the first guide shaft 21 is configured to be greater than the length of the second guide shaft 22. Both the first guide shaft 21 and the second guide shaft 22 extend axially along the housing assembly 10 and are securely engaged through the mounting groove of the housing assembly 10. The axial lengths of the first guide shaft 21 and the second guide shaft 22 match the axial dimensions of the mounting groove of the housing assembly 10, thereby providing a stable guide path for the axial movement of the member 30 to be protected.

[0048] Please refer to the following: Figure 4 In some embodiments, the component to be protected 30 is an optical element or a precision and fragile part inside the lens, such as a lens, filter, or image sensor. The component to be protected 30 is generally cylindrical, and its outer contour is adapted to the internal accommodating cavity of the housing assembly 10. Moreover, the component to be protected 30 usually has high precision requirements or is made of brittle material, and is prone to deformation, breakage, or performance degradation when subjected to external impact or vibration.

[0049] In some embodiments, the protective member 30 is provided with a first through hole 31 and a second through hole 32 on both sides, a first guide shaft 21 passing through the first through hole 31 and a second guide shaft 22 passing through the second through hole 32. The inner diameter of the first through hole 31 and the second through hole 32 is slightly larger than the outer diameter of the first guide shaft 21 and the second guide shaft 22, which effectively reduces the sliding friction resistance, prevents the protective member 30 from radially shifting or shaking during movement, and ensures that the protective member 30 can slide freely along the axial direction of the first guide shaft 21 and the second guide shaft 22.

[0050] Please refer to the following: Figure 5 In some embodiments, the baffle assembly 40 is a disc-shaped structure. The baffle assembly 40 is detachably connected to one end of the housing assembly 10 by fasteners to close the opening at one end of the housing assembly 10 to prevent it from loosening when subjected to impact, and to provide a supporting base for the first buffer 50 and the second buffer 60.

[0051] In some embodiments, the baffle assembly 40 has a recessed groove 41 on the side facing the member 30 to be protected. The shape of the recessed groove 41 is adapted to the shape of the first buffer member 50. The first buffer member 50 is fitted into the recessed groove 41 and partially protrudes from the opening of the recessed groove 41. Specifically, the groove shape of the recessed groove 41 is adapted to the outer contour of the first buffer member 50, which can form a circumferential limit on the first buffer member 50. The first buffer member 50 is fitted into the recessed groove 41, and its side facing the member 30 to be protected partially protrudes from the opening of the recessed groove 41.

[0052] In some embodiments, the baffle assembly 40 is further provided with a first positioning groove 42 and a second positioning groove 43. The first guide shaft 21 is fixed to the first positioning groove 42, and the second guide shaft 22 is fixed to the second positioning groove 43. Specifically, the first positioning groove 42 and the second positioning groove 43 are symmetrically arranged on both sides of the baffle assembly 40. The groove shape of the first positioning groove 42 and the second positioning groove 43 is adapted to the end shape of the first guide shaft 21 and the second guide shaft 22 to ensure that the guide assembly 20 will not move axially or loosen when subjected to impact. The first guide shaft 21 passes through the first through hole 31 of the member to be protected 30 and the second buffer member 60 sleeved on its outer side in sequence along the axial direction. The second guide shaft 22 passes through the second through hole 32 of the member to be protected 30 and another second buffer member 60 sleeved on its outer side in sequence along the axial direction, so that the second buffer member 60 is confined between the member to be protected 30 and the baffle assembly 40.

[0053] Please refer to the following: Figure 6 In some embodiments, the motion impact suppression system 1 based on voice coil motor actuation includes a plurality of first buffer members 50, each of which is elongated and distributed circumferentially along the baffle assembly. Specifically, the first buffer members 50 are embedded in corresponding insertion slots 41, and the thickness of the first buffer member 50 is configured to be greater than the depth of the insertion slot 41. The first buffer member 50 includes a buffer surface 51 and a contact surface 52 disposed opposite to each other. The buffer surface 51 protrudes from the opening of the insertion slot 41 in the installed state, and the contact surface 52 is in contact with the inner wall of the bottom of the insertion slot 41. When the component to be protected 30 is subjected to a slight impact, it can preferentially contact the buffer surface 51 of the first buffer member 50, ensuring that the first buffer member 50 undergoes elastic deformation first to absorb the impact energy, thereby achieving precise buffering of slight vibrations. At the same time, the circumferentially distributed distribution of the plurality of first buffer members 50 allows the component to be protected 30 to be subjected to uniform force in the circumferential direction, avoiding skewing or damage caused by insufficient local buffering or overload.

[0054] As an optional embodiment, four first buffer members 50 are provided. The four first buffer members 50 are evenly distributed along the circumference of the baffle assembly 40, and together they form a buffer array symmetrically arranged around the center of the baffle assembly 40. This allows the first buffer member 50 at the corresponding position to preferentially absorb the impact energy when the component to be protected 30 is subjected to slight impacts from different directions, thereby further improving the buffering efficiency.

[0055] Please refer to the following: Figure 7In some embodiments, the motion impact suppression system 1 based on voice coil motor actuation includes multiple second buffers 60, each of which is annular in shape. The multiple second buffers 60 are respectively sleeved on the first guide shaft 21 and the second guide shaft 22, and one side of each second buffer 60 abuts against the baffle assembly 40. Specifically, a through hole 61 extending axially is provided at the center of each second buffer 60, and the inner diameter of the through hole 61 is adapted to the outer diameter of the first guide shaft 21 and the second guide shaft 22. The second buffer 60 is confined between the member to be protected 30 and the baffle assembly 40. When the member to be protected 30 is subjected to severe impact, the second buffer 60 can be precisely compressed and deformed along the axial direction of the guide shaft, thereby cooperating with the first buffer 50 to achieve graded buffering. Simultaneously, the side of the second buffer 60 abuts against the baffle assembly 40, providing stable axial support during impact, further improving the buffering reliability and structural stability under severe impact.

[0056] As an optional embodiment, two second buffer members 60 are provided, one of which is sleeved on the first guide shaft 21 and the other is sleeved on the second guide shaft 22. The two second buffer members 60 are symmetrically arranged on both sides of the baffle assembly 40, so that the component to be protected 30 is subjected to force more evenly, effectively avoiding the deviation and damage caused by uneven force on one side.

[0057] In some embodiments, under normal operating conditions, when the component to be protected 30 is subjected to a minor impact, the first buffer 50 contacts the component to be protected 30 and undergoes elastic deformation to form a primary buffer, while the second buffer 60 does not undergo elastic deformation. Specifically, when the component to be protected 30 is subjected to minor impacts such as those from daily operation or slight vibration, the component to be protected 30 will move slightly along the axial direction of the guide assembly 20 towards the baffle assembly 40. At this time, the buffer surface 51 of the first buffer 50, which protrudes from the groove of the embedded groove 41, will first contact the component to be protected 30 and undergo elastic deformation under the squeezing force of the component to be protected 30. It absorbs the energy generated by the minor impact through its own elastic deformation, thereby forming a primary buffer and effectively offsetting the impact of the minor impact on the component to be protected 30. At this time, the axial movement distance of the component to be protected 30 is small, and it does not contact the second buffer 60. The second buffer 60 remains in its initial state without elastic deformation, and only the first buffer 50 independently completes the buffer protection operation, which meets the protection needs of daily minor impacts.

[0058] In some embodiments, when the first buffer forms a primary buffer, the original length and compression amount of the first buffer satisfy the following relationship:

[0059] 0.1L1≤△L1≤0.4L1;

[0060] Where L1 represents the original length of the first buffer, and ΔL1 represents the compression amount of the first buffer.

[0061] In this embodiment of the invention, by controlling the compression of the first buffer 50 within the range of 0.1 to 0.4 times its original length, the first buffer 50 can fully absorb the impact energy under normal minor impacts, without the buffering effect being insufficient due to too small a compression, or the failure due to excessive deformation and exceeding the elastic limit caused by excessive compression, thereby ensuring the stable protection capability of the first buffer 50 against daily vibrations.

[0062] In some embodiments, when the first buffer forms a primary buffer, the elastic modulus of the first buffer satisfies the following relationship:

[0063] 2.5×M×△V1 / (A1×△t1)≤E1≤10×M×△V1 / (A1×△t1)

[0064] Where M represents the mass of the component 30 to be protected, ΔV1 represents the velocity change value of the component 30 to be protected under normal operating conditions (generally ΔV1≤1.6 m / s, equivalent to a free fall from a height of 0.1m), A1 represents the cross-sectional area of ​​the first buffer 50, Δt1 represents the time required for the velocity change ΔV1 of the component 30 to be protected (generally 0.01s≤Δt1≤0.02s, related to the compression of the first buffer), and E1 represents the elastic modulus of the first buffer 50.

[0065] Specifically, (1) according to Hooke's Law, within the elastic limit, the compression of the first buffer 50 is directly proportional to the pressure it receives. Considering the actual pressure absorbed by the first buffer 50, the compression required for the first buffer 50 to form a primary buffer can be calculated using the following formula:

[0066] △L1 =F1×L1 / (E1×A1);

[0067] Wherein, △L represents the compression of the first buffer 50, F1 represents the impact force absorbed by the first buffer 50, L1 represents the original length of the first buffer 50, E1 represents the elastic modulus of the first buffer 50, and A1 represents the cross-sectional area of ​​the first buffer 50.

[0068] (2) At the same time, in accordance with the kinetic energy theorem, when the first buffer 50 absorbs the impact energy under normal operating conditions, it satisfies the corresponding relationship between momentum change and impulse, that is, the momentum change of the component to be protected 30 can be obtained by the following formula:

[0069] M×△V1=F1×△t1;

[0070] Where M represents the mass of the component 30 to be protected, △V1 represents the velocity change value of the component 30 to be protected under normal operating conditions, F1 represents the impact force absorbed by the first buffer 50, and △t1 represents the time required for the velocity of the component 30 to complete the change of △V1.

[0071] (3) By combining the above formulas and eliminating the intermediate variable F1, the elastic modulus of the first buffer 50 can be derived:

[0072] E1=L1×M×△V1 / (△L1×A1×△t1);

[0073] Wherein, E1 represents the elastic modulus of the first buffer 50, ΔL represents the compression of the first buffer 50, L1 represents the original length of the first buffer 50, M represents the mass of the component 30 to be protected, ΔV1 represents the velocity change value of the component 30 to be protected under normal operating conditions, F1 represents the impact force absorbed by the first buffer 50, and Δt1 represents the time required for the velocity of the component 30 to complete the ΔV1 change.

[0074] (4) In this embodiment of the invention, since the ratio between the original length L1 of the first buffer 50 and the compression amount ΔL1 of the first buffer 50 is known to satisfy the following relationship: 0.1≤ΔL1 / L1≤0.4; substituting this ratio into the elastic modulus formula of the first buffer 50 in step (3) above, the range of elastic modulus values ​​of the first buffer 50 is further derived:

[0075] 2.5×M×△V1 / (A1×△t1)≤E1≤10×M×△V1 / (A1×△t1)

[0076] Where M represents the mass of the component 30 to be protected, ΔV1 represents the velocity change value of the component 30 to be protected under normal operating conditions, A1 represents the cross-sectional area of ​​the first buffer 50, Δt1 represents the time required for the velocity change ΔV1 of the component 30 to be protected, and E1 represents the elastic modulus of the first buffer 50.

[0077] In this embodiment of the invention, through the above derivation, this embodiment transforms the compression constraint of the first buffer 50 into a quantitative selection range of the elastic modulus E1 of the first buffer 50. Based on the mass M of the component to be protected 30, the velocity change value ΔV1 of the component to be protected 30 under normal operating conditions, the cross-sectional area A1 of the first buffer 50, and the time Δt1 required for the velocity change ΔV1 of the component to be protected 30, the elastic modulus design requirements of the first buffer 50 can be determined according to step (4), thereby achieving accurate selection of the material of the first buffer.

[0078] In some embodiments, under severe impact conditions, when the component to be protected 30 is subjected to a severe impact, the first buffer 50 first contacts the component to be protected 30 and undergoes elastic deformation to form a primary buffer. The second buffer 60 intervenes before the first buffer 50 fails or before the compression of the first buffer 50 reaches a preset threshold, and undergoes elastic deformation together with the first buffer 50 to form a secondary buffer. Specifically, under severe impact conditions such as transport drops or accidental collisions, the component to be protected 30 will move rapidly and significantly along the axial direction of the guide assembly 20 towards the baffle assembly 40 under the action of strong external forces. At this time, the buffer surface 51 of the first buffer 50, which protrudes from the groove of the embedded groove 41, will first contact the component to be protected 30 and undergo elastic deformation under the action of extrusion force. It absorbs part of the impact energy through its own deformation, initially forming a primary buffer to weaken the impact force. As the impact energy continues to be input, the axial displacement of the component to be protected 30 continues to increase, and the first buffer 50 is gradually compressed. Before the first buffer 50 fails or before the compression of the first buffer 50 reaches a preset threshold, the component 30 to be protected moves further to contact the second buffer 60 and applies axial pressure to the second buffer 60. At this time, the second buffer 60 intervenes and undergoes elastic deformation together with the first buffer 50, synergistically absorbing the remaining impact energy. The two combine to form a two-stage buffer structure. Through the superimposed deformation of the two buffers, the remaining energy generated by the severe impact is fully absorbed, significantly reducing the impact force on the component 30 to be protected, and achieving graded buffer protection against severe impacts.

[0079] In some embodiments, when the second buffer and the first buffer undergo elastic deformation together to form a secondary buffer, the original length and compression amount of the second buffer satisfy the following relationship:

[0080] 0.5×L2≤△L2≤0.8×L2;

[0081] Where L2 represents the original length of the second buffer, and ΔL2 represents the compression amount of the second buffer.

[0082] In this embodiment of the invention, by controlling the compression of the second buffer 60 within the range of 0.5 to 0.8 times its original length, the second buffer 60 can provide sufficient support stiffness and energy absorption capacity under severe impact or accidental drop conditions, avoiding buffer failure due to insufficient compression or plastic deformation and inability to rebound and reset due to excessive compression, ensuring that the secondary buffer can reliably intervene before the primary buffer reaches its limit, and achieving multi-level collaborative protection.

[0083] In some embodiments, when the second buffer 60 and the first buffer 50 undergo elastic deformation together to form a secondary buffer, the elastic modulus of the second buffer 60 satisfies the following relationship:

[0084] (25×M×△V2-21×E1×A1×△t2) / (20×A1×△t2) ≤E2≤(10×M×△V2-6×E1×A1×△t2) / (5×A1×△t2);

[0085] Where M represents the mass of the component 30 to be protected, ΔV2 represents the velocity change of the component 30 to be protected under severe impact conditions (generally ΔV1≤6.37m / s, equivalent to a free fall from a height of 2m), E1 represents the elastic modulus of the first buffer 50, A1 represents the cross-sectional area of ​​the first buffer 50, E2 represents the elastic modulus of the second buffer 60, Δt2 represents the time required for the second buffer 60 to start acting until the velocity of the component 30 to drop to zero (generally 0.005s≤Δt1≤0.01s, related to the compression of the first and second buffers), A1 represents the cross-sectional area of ​​the first buffer 50, and Δt1 represents the time required for the velocity change ΔV1 of the component 30 to be protected.

[0086] Specifically, (1) according to the kinetic energy theorem, when the first buffer 50 and the second buffer 60 simultaneously absorb the impact energy under severe impact conditions, the relationship between momentum change and impulse is satisfied, that is, the momentum change of the component to be protected 30 can be obtained by the following formula:

[0087] M×△V2=F3×△t3+ F2×△t2;

[0088] Where M represents the mass of the component 30 to be protected, ΔV2 represents the velocity change of the component 30 to be protected under severe impact conditions, F2 represents the force absorbed by the second buffer 60, F3 represents the force absorbed by the first buffer 50 in the secondary buffering stage, Δt2 represents the time required for the second buffer 60 to start acting until the velocity of the component 30 to become zero, and Δt3 represents the time required for the first buffer 50 to start acting until the velocity of the component 30 to drop to zero.

[0089] (2) According to Hooke's Law, the amount of compression required for the first buffer 50 to form the second-level buffer can be calculated by the following formula:

[0090] △L3=F3×L1 / (E1×A1);

[0091] Wherein, △L3 represents the amount of compression required by the first buffer 50 in the secondary buffering stage, F3 represents the force absorbed by the first buffer 50 in the secondary buffering stage, L1 represents the original length of the first buffer 50, E1 represents the elastic modulus of the first buffer 50, and A1 represents the cross-sectional area of ​​the first buffer 50.

[0092] Similarly, the amount of compression required for the second buffer 60 to form a secondary buffer can be calculated using the following formula:

[0093] △L2=F2×L2 / (E2×A2);

[0094] Wherein, △L2 represents the amount of compression required by the second buffer 60 in the secondary buffering stage, F3 represents the force absorbed by the second buffer 60 in the secondary buffering stage, L2 represents the original length of the second buffer 60, E2 represents the elastic modulus of the second buffer 60, and A2 represents the cross-sectional area of ​​the second buffer 60.

[0095] (3) By combining the above formulas and eliminating the intermediate variables F2 and F3, the elastic modulus of the second buffer 60 can be derived:

[0096] E2=(M×△V2×L1×L2-E1△L3×L2×A1×△t3) / (L1×△L2×A2×△t2);

[0097] Wherein, E2 represents the elastic modulus of the second buffer 60, M represents the mass of the component 30 to be protected, ΔV2 represents the velocity change of the component 30 to be protected under severe impact conditions, L1 represents the original length of the first buffer 50, L2 represents the original length of the second buffer 60, E1 represents the elastic modulus of the first buffer 50, ΔL3 represents the compression required by the first buffer 50 in the secondary buffering stage, ΔL2 represents the compression required by the second buffer 60 in the secondary buffering stage, A1 represents the cross-sectional area of ​​the first buffer 50, A2 represents the cross-sectional area of ​​the second buffer 60, Δt2 represents the time required for the second buffer 60 to start acting until the velocity of the component 30 to become zero, and Δt3 represents the time required for the first buffer 50 to start acting until the velocity of the component 30 to decrease to zero.

[0098] (4) In this embodiment of the invention, it can be obtained through experiments that the compression amount of the first buffer 50 and the compression amount of the second buffer 60 satisfy the compression ratio relationship:

[0099] △L3 = L1 - L2 + △L2;

[0100] L2 = 0.8L1;

[0101] Wherein, △L3 represents the amount of compression required by the first buffer 50 in the secondary buffering stage, L1 represents the original length of the first buffer 50, L2 represents the original length of the second buffer 60, and △L2 represents the amount of compression required by the second buffer 60 in the secondary buffering stage.

[0102] (5) Since the first buffer 50 and the second buffer 60 act almost simultaneously during the violent impact, their action times satisfy an approximate relationship:

[0103] △t3≈△t2;

[0104] Wherein, Δt2 represents the time required for the second buffer 60 to start working until the speed of the component to be protected 30 becomes zero, and Δt3 represents the time required for the first buffer 50 to start working until the speed of the component to be protected 30 drops to zero.

[0105] (6) In this embodiment of the invention, the cross-sectional area of ​​the first buffer 50 and the cross-sectional area of ​​the second buffer satisfy the following relationship:

[0106] A1=A2;

[0107] A1 represents the cross-sectional area of ​​the first buffer 50, and A2 represents the cross-sectional area of ​​the second buffer 60.

[0108] (7) Since it is known that when the second buffer and the first buffer undergo elastic deformation together to form a secondary buffer, the ratio between the original length L2 of the second buffer 60 and the compression amount ΔL2 of the second buffer 60 satisfies the following relationship: 0.5≤ΔL2 / L2≤0.8, this ratio is substituted into the elastic modulus formula of the second buffer 60 in step (3) above, and combined with the formulas in steps (4)-(6), the range of elastic modulus values ​​of the second buffer 60 is further derived:

[0109] (25×M×△V2-21×E1×A1×△t2) / (20×A1×△t2) ≤E2≤(10×M×△V2-6×E1×A1×△t2) / (5×A1×△t2);

[0110] Where M represents the mass of the component 30 to be protected, ΔV2 represents the velocity change of the component 30 to be protected under severe impact conditions, E1 represents the elastic modulus of the first buffer 50, A1 represents the cross-sectional area of ​​the first buffer 50, E2 represents the elastic modulus of the second buffer 60, and Δt2 represents the time required for the second buffer 60 to start acting until the velocity of the component 30 to be protected drops to zero.

[0111] In this embodiment of the invention, through the above derivation, this embodiment transforms the compression constraint of the second buffer 60 into a quantitative selection range of the elastic modulus E2 of the second buffer 60. Based on the mass M of the component to be protected 30, the velocity change value ΔV2 of the component to be protected 30 under severe impact conditions, the elastic modulus E1 of the first buffer, the cross-sectional area A1 of the first buffer, and the time Δt2 required for the second buffer 60 to start acting until the velocity of the component to be protected 30 drops to zero, the design requirements of the elastic modulus of the second buffer 60 can be determined according to step (7), thereby achieving accurate selection of the material of the second buffer.

[0112] The specific implementation of the present invention will be described in detail below with reference to specific embodiments:

[0113] In this embodiment of the invention, the mass of the component to be protected 30 is M = 0.1 kg, and the cross-sectional areas of the first buffer 50 and the second buffer 60 are A1 = A2 = 40 mm. 2 The original length of the first buffer 50 is L1=2mm, and the original length of the second buffer 60 is L2=0.8L1=1.6 mm. Under normal operating conditions, the velocity change value of the component to be protected 30 is ΔV1=1.6 m / s, and the time required for the velocity change ΔV1 of the component to be protected 30 is Δt1=0.02s.

[0114] Based on the aforementioned formula for selecting the range of elastic modulus of the first buffer:

[0115] 2.5×M×△V1 / (A1×△t1)≤E1≤10×M×△V1 / (A1×△t1)

[0116] Substituting the above parameters into the calculation, the elastic modulus of the first buffer component satisfies the following relationship:

[0117] 2×10^4 Pa≤E1≤8×10^4 Pa;

[0118] Within this elastic modulus range, memory foam, low-density PU foam, and silicone gel are generally suitable materials for the first cushioning element 50. Specific material types can be confirmed and selected according to Table 1, which is a table of actual material properties.

[0119] Table 1

[0120]

[0121] Similarly, under severe impact conditions, the velocity change of the protected component 30 is ΔV2 = 6.37 m / s, and the time required for the second buffer 60 to reduce the velocity of the protected component 30 to zero from the start of its action is Δt2 = 0.01 s. The maximum value of the elastic modulus E1 of the first buffer is then selected. max =8×10^4 Pa and minimum value E1 min =2×10^4 Pa, according to the aforementioned relationship for selecting the range of elastic modulus of the second buffer:

[0122] (25×M×△V2-21×E1×A1×△t2) / (20×A1×△t2) ≤E2≤(10×M×△V2-6×E1×A1×△t2) / (5×A1×△t2);

[0123] Substituting the above parameters into the calculation, the elastic modulus E2 of the second buffer 60 satisfies the following relationship:

[0124] 1.4325×10^6Pa≤E2≤2.225×10^6Pa;

[0125] Within this elastic modulus range, high-density EPE / XPE, EPP foam, medium-hardness rubber, and certain rigid foams can generally be selected as the materials for the second cushioning element 60. Specific material models should be confirmed and selected according to Table 1.

[0126] The present invention provides a photographic lens, which includes a lens barrel and a motion shock suppression system 1 actuated by a voice coil motor as described above. The motion shock suppression system 1 actuated by a voice coil motor is disposed inside the lens to provide buffer protection for the component 30 to be protected.

[0127] The above embodiments are merely illustrative of the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the scope of disclosure involved in the above embodiments is not limited to technical solutions formed by specific combinations of the above technical features, but should also cover other technical solutions formed by arbitrary combinations of the above technical features or their equivalent features without departing from the above-disclosed concept. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0128] Furthermore, while the operations are described in a specific order, this should not be construed as requiring these operations to be performed in the specific order shown or in sequential order. In certain circumstances, multitasking and parallel processing may be advantageous. Similarly, while several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of the invention. Certain features described in the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented individually or in any suitable sub-combination in multiple embodiments.

Claims

1. A motion shock suppression system based on voice coil motor actuation, characterized in that, The motion shock suppression system based on voice coil motor actuation includes: Housing assembly; A guide assembly, disposed inside the housing assembly, includes a first guide shaft and a second guide shaft, the first guide shaft and the second guide shaft being symmetrically disposed on both sides of the housing assembly; The component to be protected is sleeved on the first guide shaft and the second guide shaft, and moves along the axial direction of the first guide shaft and the second guide shaft; A baffle assembly is detachably connected to one end of the housing assembly and fixedly connected to the guide assembly; A first buffer is assembled on the side of the baffle assembly facing the member to be protected, and is disposed between the member to be protected and the baffle assembly; The second buffer is arranged sequentially with the first buffer along the axial direction between the member to be protected and the baffle assembly, and is located on the side of the first buffer closer to the member to be protected; The first buffer is used to elastically deform when the component to be protected is impacted to form a primary buffer. The second buffer is used to intervene before the first buffer fails or before the compression of the first buffer reaches a preset threshold, and to elastically deform together with the first buffer to form a secondary buffer, thereby forming a graded buffer protection for the component to be protected. The motion impact suppression system based on voice coil motor actuation includes multiple first buffers, each of which is a long strip structure, and the multiple first buffers are distributed circumferentially along the baffle assembly. The motion impact suppression system based on voice coil motor actuation includes multiple second buffers, each of which is a ring structure, and the multiple second buffers are respectively sleeved on the first guide shaft and the second guide shaft, and one side of each second buffer abuts against the baffle assembly. The two sides of the component to be protected are respectively provided with a first through hole and a second through hole, the first guide shaft passes through the first through hole, and the second guide shaft passes through the second through hole.

2. The motion shock suppression system based on voice coil motor actuation as described in claim 1, characterized in that, The baffle assembly has an embedded groove recessed on one side facing the member to be protected. The shape of the embedded groove is adapted to the shape of the first buffer member. The first buffer member is embedded in the embedded groove and partially protrudes from the opening of the embedded groove.

3. The motion shock suppression system based on voice coil motor actuation as described in claim 1, characterized in that, The baffle assembly is further provided with a first positioning groove and a second positioning groove, the first guide shaft is fixed to the first positioning groove, and the second guide shaft is fixed to the second positioning groove.

4. The motion shock suppression system based on voice coil motor actuation as described in claim 1, characterized in that, Under normal operating conditions, when the component to be protected is subjected to a minor impact, the first buffer comes into contact with the component to be protected and undergoes elastic deformation to form a primary buffer.

5. The motion shock suppression system based on voice coil motor actuation as described in claim 4, characterized in that, When the first buffer forms a primary buffer, the original length and compression amount of the first buffer satisfy the following relationship: 0.1L1≤△L1≤0.4L1; Where L1 represents the original length of the first buffer, and ΔL1 represents the compression amount of the first buffer.

6. The motion shock suppression system based on voice coil motor actuation as described in claim 5, characterized in that, When the first buffer forms a primary buffer, the elastic modulus of the first buffer satisfies the following relationship: 2.5×M×△V1 / (A1×△t1)≤E1≤10×M×△V1 / (A1×△t1) Where M represents the mass of the component to be protected, ΔV1 represents the velocity change value of the component to be protected under normal operating conditions, A1 represents the cross-sectional area of ​​the first buffer, Δt1 represents the time required for the velocity change ΔV1 of the component to be protected, and E1 represents the elastic modulus of the first buffer.

7. The motion shock suppression system based on voice coil motor actuation as described in claim 1, characterized in that, Under severe impact conditions, when the component to be protected is subjected to severe impact, the first buffer component comes into contact with the component to be protected and undergoes elastic deformation to form a primary buffer. The second buffer component intervenes before the first buffer component fails or before the compression of the first buffer component reaches a preset threshold, and together with the first buffer component undergoes elastic deformation to form a secondary buffer.

8. The motion shock suppression system based on voice coil motor actuation as described in claim 7, characterized in that, When the second buffer and the first buffer undergo elastic deformation together to form a secondary buffer, the original length and compression of the second buffer satisfy the following relationship: 0.5×L2≤△L2≤0.8×L2; Where L2 represents the original length of the second buffer, and ΔL2 represents the compression amount of the second buffer.

9. The motion shock suppression system based on voice coil motor actuation as described in claim 8, characterized in that, When the second buffer and the first buffer undergo elastic deformation together to form a secondary buffer, the elastic modulus of the second buffer satisfies the following relationship: (25×M×△V2-21×E1×A1×△t2) / (20×A1×△t2) ≤E2≤(10×M×△V2-6×E1×A1×△t2) / (5×A1×△t2); Where M represents the mass of the component to be protected, ΔV2 represents the velocity change of the component to be protected under severe impact conditions, E1 represents the elastic modulus of the first buffer, A1 represents the cross-sectional area of ​​the first buffer, E2 represents the elastic modulus of the second buffer, and Δt2 represents the time required for the second buffer to start acting until the velocity of the component to be protected drops to zero.

10. A photographic lens, characterized in that, The lens includes a lens barrel and a motion shock suppression system based on a voice coil motor actuation as described in any one of claims 1-9, wherein the motion shock suppression system based on a voice coil motor actuation is disposed inside the lens to provide buffer protection for the component to be protected.

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