Shockproof variable aperture and camera module thereof

Abstract

The application provides a shockproof variable aperture and a camera module. The shockproof variable aperture comprises a stator assembly, a rotor assembly movably mounted in the stator assembly and rotatable relative to the stator assembly, a transmission mechanism mounted between the stator assembly and the rotor assembly and assisting the rotor assembly in relative movement relative to the stator assembly, an electromagnetic driving module comprising a plurality of coils arranged at the bottom of the stator assembly and used for generating electromagnetic driving force, a planar magnet group arranged in the rotor assembly and comprising at least two magnets and facing upward relative to the coils to interact with the coils and drive the rotor assembly to move, and an adsorption assembly comprising at least one protrusion arranged in the stator assembly, the adsorption assembly cooperating with the planar magnet group to enable the stator assembly and the rotor assembly to be fixed at a target gear position.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of camera modules, in particular to a shockproof variable aperture and a camera module thereof. BACKGROUND

[0002] In the field of variable aperture technology, especially in the design of two-stage variable aperture for special application scenarios such as automobiles, how to ensure the magnetic self-locking effect of the aperture at the motion end point position has always been a technical problem to be solved.

[0003] Traditional gear aperture relies on gear meshing to transmit torque and maintain position. When encountering severe shaking, the small gap or elastic deformation of the gear part can easily cause gear backlash to vibrate, causing the aperture to change slightly and quickly, thereby affecting the imaging quality. In order to adapt to the demand for flattening, traditional variable apertures usually adopt a planar magnet group coil structure, and the magnetic attraction reset mechanism is designed at the bottom. Such design is suitable for the smooth motion demand of continuous variable aperture, which requires continuous current to be connected to generate magnetic force to resist external force, resulting in increased power consumption of the camera module, and coil heating may cause thermal drift, thereby affecting image quality. For two-stage variable aperture, the core requirement is to achieve stable self-locking function at two fixed motion end point positions to prevent aperture misoperation or shaking caused by external vibration or jolt.

[0004] In complex working environments such as automobiles, jolt, vibration and other external forces frequently act on the variable aperture system, and the adsorption force distribution of the traditional bottom magnetic attraction structure is difficult to meet the high-strength self-locking demand at the end point position. In addition, the dispersion of magnetic attraction force also makes the adsorption stability at the end point position insufficient, further exacerbating the shaking risk of the aperture under extreme working conditions. SUMMARY

[0005] One or more embodiments of the present application provide a shockproof variable aperture to solve or at least partially alleviate the poor anti-shaking ability and high power consumption in related technologies.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0007] A shockproof variable aperture comprises:

[0008] A stator assembly as a support frame of the aperture;

[0009] A rotor assembly movably mounted inside the stator assembly and rotatable relative to the stator assembly;

[0010] A transmission mechanism installed between the stator assembly and the rotor assembly to assist the relative motion of the rotor assembly relative to the stator assembly;

[0011] An electromagnetic drive module comprising:

[0012] a coil set disposed at the bottom of the stator assembly for generating electromagnetic driving force;

[0013] a planar magnet set disposed on the rotor assembly, the planar magnet set comprising at least two magnets and facing the coil set for interacting with the coil set to drive the rotor assembly to move;

[0014] an adsorption assembly comprising at least one protrusion disposed on the stator assembly, the protrusion cooperating with the planar magnet set to keep the stator assembly and the rotor assembly fixed at a target gear position.

[0015] A shockproof variable aperture, comprising:

[0016] a stator assembly as a support frame of the aperture;

[0017] a rotor assembly movably mounted inside the stator assembly and rotatable relative to the stator assembly;

[0018] a transmission mechanism mounted between the stator assembly and the rotor assembly to assist the rotor assembly to move relative to the stator assembly;

[0019] an electromagnetic driving module, comprising:

[0020] a coil set disposed at the bottom of the stator assembly for generating electromagnetic driving force;

[0021] a planar magnet set disposed on the rotor assembly, the planar magnet set comprising at least two magnets and facing the coil set for interacting with the coil set to drive the rotor assembly to move;

[0022] an adsorption assembly comprising at least one protrusion disposed on the stator assembly, the protrusion cooperating with the planar magnet set to keep the stator assembly and the rotor assembly fixed at a target gear position.

[0023] Optionally, the transmission mechanism comprises a ball structure, the stator assembly is provided with an annular slope groove, the lower surface of the rotor assembly is provided with a corresponding annular slope groove, and the ball structure is accommodated between the two annular slope grooves.

[0024] Optionally, the protrusion is disposed at a gap position between adjacent magnets in the planar magnet set, and the protrusion extends from the stator assembly to the rotor assembly. This arrangement allows the protrusion to generate an adsorption force with the planar magnet set at a position where the magnetic field is strongest.

[0025] Optionally, the left and right sides of the protruding part are provided with magnetic attraction parts, which correspond to the magnetic pole direction arrangement of the planar magnet group, thereby enhancing the adsorption effect. The magnetic attraction parts are made of high magnetic permeability material, which can significantly enhance the local magnetic field strength.

[0026] Optionally, the adsorption assembly further comprises an outer magnetic yoke, which is in a semi-enclosing structure around the top surface, bottom and peripheral side wall of the coil group and the planar magnet group, forming a closed magnetic circuit to enhance the magnetic field strength. The arrangement of the outer magnetic yoke not only improves the utilization efficiency of the magnetic field, but also effectively prevents the interference of magnetic field leakage on the surrounding electronic elements.

[0027] Optionally, the adsorption assembly further comprises a magnetic conductive member, which comprises a plurality of units, each unit comprising a left magnetic conductive member and a right magnetic conductive member, which are respectively arranged on both sides of each magnet in the planar magnet group and correspondingly matched with the magnetic attraction parts of the protruding part. The magnetic conductive member and the magnetic attraction part form a complete magnetic force closed loop system, which greatly improves the adsorption force.

[0028] Optionally, the planar magnet group comprises at least three annularly arranged magnets, and gaps are provided between adjacent magnets for releasing thermal expansion stress and reducing vibration transmission. Compared with the traditional whole annular magnet, the segmented design enhances the thermal adaptability and shock resistance of the structure.

[0029] Optionally, the rotor assembly comprises at least two aperture blades for controlling the size of the light aperture, and at least two connecting rods, which are distributed circumferentially on the rotor assembly and used for connecting and moving the aperture blades.

[0030] Optionally, the non-optical edge of the aperture blade is provided with a pin hole, which cooperates with the connecting rod to form a rotating pair, so that the aperture blade can rotate around the connecting rod. This design ensures the accurate positioning and smooth movement of the aperture blade.

[0031] Optionally, the stator assembly comprises a shell and a base, the coil group is arranged at the bottom of the base, the central area of the base is provided with a light aperture, and the shell is in a barrel-shaped structure surrounding the base. This structural design provides stable optical axial support and accurate optical centering capability.

[0032] Optionally, the coil group comprises at least three fan-shaped coil units, the planar magnet group comprises a number of magnet units equal to the number of coil units, and the magnet units correspond one-to-one to the coil units. This symmetrical arrangement not only ensures the uniform distribution of driving force, but also reduces the eccentricity error during aperture movement.

[0033] The application also provides a camera module, comprising a photosensitive assembly, a lens assembly and any one of the anti-vibration variable apertures.

[0034] Compared with the prior art, the inherent static magnetic attraction between the planar magnet group, the magnetic conducting member and the protruding part is used to keep the position of the aperture in some embodiments of the application. In the state of the end of the coil, the magnetic field of the planar magnet group can generate an adsorption force to adsorb the magnetic conducting member on the corresponding protruding part, and the locking of the aperture blade in the target gear can be realized without continuous power supply. Meanwhile, the protruding part can also physically limit the transmission mechanism, so that the position of the aperture blade is more accurate, and the imaging quality is further improved.

[0035] Compared with the prior art, the application has at least one of the following advantages:

[0036] 1. Zero-power self-locking: the static magnetic attraction between the planar magnet group, the magnetic conducting member and the protruding part is used to keep the position of the aperture. In the state of the coil power-off, the permanent magnetic field of the planar magnet group can generate sufficient adsorption force to adsorb the magnetic conducting member on the corresponding protruding part, and the locking of the aperture blade in the target gear can be realized without continuous power supply, which significantly reduces the system power consumption.

[0037] 2. Double anti-vibration structure: the double anti-vibration structure of "magnetic adsorption + mechanical limiting" is adopted. The protruding part not only serves as a magnetic adsorption element, but also provides physical limiting for the transmission mechanism, so that the position of the aperture blade is more accurate and stable, and the bumping impact during vehicle driving is effectively resisted.

[0038] 3. Strong thermal adaptability: through the segmented design of the planar magnet group, the gap between the magnets can effectively relieve thermal expansion stress, improve the stability of the system in a temperature fluctuation environment, and adapt to harsh working environments of automobiles.

[0039] 4. Vibration attenuation design: the multi-segment magnet layout makes the vibration wave blocked by the gap when transmitted, reduces the resonance amplitude of the overall structure, avoids local damage, and further improves the reliability and service life of the system.

[0040] 5. Reducing thermal drift: since continuous power supply is not required in the working state, the coil heating phenomenon is reduced, the adverse effects of thermal drift on optical performance are effectively inhibited, and the imaging quality is improved.

[0041] Compared with the prior art, some embodiments of the application have stronger anti-vibration performance and lower power consumption, and are suitable for use in environments such as vehicles and engineering equipment that are prone to bumping and vibration. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings of the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only relate to some of the embodiments of the present application and not limit the present application.

[0043] Figure 1 The front view of the variable aperture in some embodiments of the present application.

[0044] Figure 2 The top view of the base in some embodiments of the present application.

[0045] Figure 3 The top view of the planar magnet set in some embodiments of the present application.

[0046] Figure 4 The top view of the rotor assembly in some embodiments of the present application.

[0047] Figure 5 The cross-sectional view of the electromagnetic driving module in some embodiments of the present application.

[0048] Figure 6 The cross-sectional view of the variable aperture in some embodiments of the present application.

[0049] In the figure: 10, mechanical module; 20, electromagnetic driving module; 11, stator assembly; 111, stator housing; 112, base; 132, protrusion set; 133, outer magnetic yoke; 1321, first protrusion; 1322, second protrusion; 1323, third protrusion; 1324, fourth protrusion; 12, rotor assembly; 121, aperture blade; 1211, first blade; 1212, second blade; 122, rotating carrier; 1221, connecting rod; 13, adsorption assembly; 131, magnetic conducting piece; 1311, first magnetic conducting piece; 1312, second magnetic conducting piece; 1313, third magnetic conducting piece; 1314, fourth magnetic conducting piece; 14, transmission mechanism; 141, ball structure; 21, planar magnet set; 211, first magnet; 212, second magnet; 213, third magnet; 214, fourth magnet; 22, coil set. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solutions and advantages of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings showing the embodiments according to the present application. It should be understood that the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments described in the present application, all other embodiments obtained by those skilled in the art without creative labor shall fall within the scope of protection of the present application.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising," "including," "containing," "have," "has," "including," "having," "with," and the like as used herein are specifically intended to be open-ended and to mean including, but not limited to. A method or apparatus that "comprises," "has," "includes" or "is including" one or more steps or elements does not, unless otherwise indicated, exclude additional steps or elements. The terms "first," "second," and the like, as used herein do not have any specific meaning, and are used only to distinguish one general category from another. Also, the terms "first" and "second" are used only for descriptive purposes and are not intended to indicate or imply relative importance. Thus, a feature with a "first" and a "second" can include one or more of the features. In the description herein, the meaning of "a", "an" and "the" is "one or more", unless otherwise specified.

[0052] As described above, it should be emphasized that when the term "comprising / comprising" is used in the present specification, it is used to expressly indicate that the features, integers, steps or components described in the specification are present, but not to exclude the presence or addition of one or more other features, integers, steps, components or groups of features, integers, steps, components. As used herein, the singular forms "a", "an" and "the" also include the plural forms, unless the context clearly indicates otherwise.

[0053] The term "and / or" in the present application is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0054] As Figure 1 As shown in the figure, some embodiments of the present application disclose a shockproof variable aperture, which comprises a mechanical module 10 and an electromagnetic driving module 20. The mechanical module 10 and the electromagnetic driving module 20 are two core functional modules. The mechanical module 10 is mainly used as a bearing component of the variable aperture, so that it can realize the adjustment of the aperture aperture under the action of electromagnetic force, and the aperture can be fixed at the target gear through physical contact. The electromagnetic driving module 20 is used to drive the mechanical module 10 to move through controllable electromagnetic force, provide magnetic force to adsorb the aperture on the target gear, and effectively suppress the shaking caused by external shaking.

[0055] In some embodiments of the present application, the mechanical module 10 includes a stator assembly 11, which is the core support and fixed frame of the entire mechanical module 10; a rotor assembly 12, which is movably mounted inside the stator assembly 11 and can rotate relative to the stator assembly 11; an adsorption assembly 13, which is respectively mounted on the stator assembly 11 and the rotor assembly 12, and the corresponding adsorption assemblies 13 cooperate with each other to keep the stator assembly 11 and the rotor assembly 12 fixed at the target gear position; and a transmission mechanism 14, which is installed between the stator assembly 11 and the rotor assembly 12 and allows the rotor assembly 12 to move relative to the stator assembly 11 with low friction.

[0056] In some embodiments of the present application, the stator assembly 11 is used to provide the core support and fixed frame for the mechanical module 10, and includes a stator housing 111, which is the main housing structure of the mechanical module 10 and is in the shape of a ring and surrounds the internal components; and a base 112, which is fixedly connected to the inner side of the stator housing 111 and serves as a more internal support platform.

[0057] As shown in Figure 1 In some embodiments of the present application, the stator housing 111 is a rigid, hollow barrel-shaped shell used to form the main external structure of the stator assembly 11 and provide protection for the installation of other components; the stator housing 111 has an annular side wall that surrounds the core components such as the base 112 and the rotor assembly 12 inside the stator housing 111.

[0058] In some embodiments of the present application, the base 112 is a rigid annular platform structure and is the core support base of the stator assembly 11, which is arched to connect the inner side of the bottom of the stator housing 111; the central area of the base 112 is provided with a light passage hole coaxial with the optical axis, which allows light to pass through the base 112.

[0059] As shown in Figure 3As shown in some embodiments of this application, the rotor assembly 12 is movably mounted inside the stator assembly 11, including at least two aperture blades 121 for controlling the scaling of the aperture; a rotating carrier 122 is fixedly connected to the main structure of the stator assembly 11, including at least two connecting rods 1221. Each connecting rod 1221 is a rod-shaped element. In some optional embodiments, the connecting rod 1221 is implemented as a pin. Multiple connecting rods 1221 are circumferentially symmetrically distributed on the top side of the rotating carrier 122, connecting to the aperture blades 121 and driving the aperture blades 121 to move relative to each other. The number of connecting rods 1221 should be consistent with the number of aperture blades 121. In some optional embodiments, the number of connecting rods 1221 is even, which helps to balance the motion torque and reduce vibrations that may occur when the rotor assembly 12 moves at high speeds.

[0060] In some embodiments of this application, the aperture blade 121 is the actuator for changing the optical aperture of the anti-vibration variable aperture, including a first blade 1211 and a second blade 1212. The non-optical edge of the aperture blade 121 is provided with a pin hole, which corresponds to the pin provided on the connecting rod 1221, so that the pin at the upper end of the connecting rod 1221 is precisely inserted into the pin hole at the end of the aperture blade 121, forming a rotating pair, so that the aperture blade 121 can rotate freely around the connecting rod 1221.

[0061] In some embodiments of this application, the upper end of the connecting rod 1221 is provided with a slider, and the aperture blade 121 is provided with a guide groove corresponding to the slider. The slider on the connecting rod 1221 is embedded in the guide groove on the aperture blade 121 to form a sliding pair, so that the aperture blade 121 slides in the guide groove, while constraining the movement trajectory of the aperture blade 121, further improving the stability of the aperture system in a vibration environment.

[0062] It is understood that the main function of the aperture blade 121 and the rotating carrier 122 in this embodiment is to change the size of the aperture by rotating the rotating carrier 122 to drive the aperture blade 121 to move. Those skilled in the art can change the number of blades in the aperture blade 121 and the connection method between the aperture blade 121 and the rotating carrier 122 according to their own needs to achieve the implementation purpose.

[0063] like Figure 6 As shown in some embodiments of this application, the transmission mechanism 14 is installed between the stator assembly 11 and the rotor assembly 12, maintaining the axial clearance of the rotor assembly 12 relative to the stator assembly 11 along the optical axis direction, and assisting in realizing the relative rotational movement of the stator assembly 11 and the rotor assembly 12.

[0064] Further, in some embodiments of the present application, the transmission mechanism 14 comprises a plurality of ball structures 141, which can be fixedly arranged on the stator assembly 11 or the rotor assembly 12, or movably supported between the stator assembly 11 and the rotor assembly 12. The upper surface of the stator assembly 11 is provided with an annular groove, and the lower surface of the rotor assembly 12 is correspondingly provided with an annular groove. In some optional examples, the annular groove has an inclined inner wall, forming an annular slope groove. In some optional embodiments, the annular groove has a flat inner wall. Further, the annular grooves provided on the surfaces of the stator assembly 11 and the rotor assembly 12 can have one set of inclined inner walls and the other set of flat inner walls, for better assembly positioning accuracy. Further, the annular groove is not limited to one whole, and in some optional embodiments, a plurality of annular grooves are distributed around the light transmission hole, preferably not less than three. The ball structure 141 is accommodated in the track formed by the annular groove on the upper surface of the stator assembly 11 and the annular groove on the lower surface of the rotor assembly 12. In some optional embodiments, the ball structure 141 is accommodated between two annular slope grooves. When the ball structure 141 rolls in the track, the friction between the stator assembly 11 and the rotor assembly 12 is significantly reduced, improving the response speed and service life.

[0065] It can be understood that the ball structure 141 in the present embodiment mainly provides a reduced friction transmission function for the relative movement of the stator assembly 11 and the rotor assembly 12. Those skilled in the art can replace it with other similar embodiments according to the principle and their own circumstances to meet their own needs.

[0066] As Figures 4-5As shown in some embodiments of the present application, the electromagnetic drive module 20 includes the planar magnet group 21 and the coil group 22; the coil group 22 is arranged on the surface of the base 112 of the stator assembly 11, and generates a precisely controllable electromagnetic field when receiving a control current, which interacts with the permanent magnetic field of the planar magnet group 21 to form a directional driving force, driving the precise rotation of the rotor assembly 12 to achieve aperture position switching. In some embodiments of the present application, the coil group 22 adopts a multi-coil segmented design, further including a first coil, a second coil, a third coil and a fourth coil, which are uniformly distributed in a fan shape on the surface of the base 112 and arranged towards the rotor assembly 12. Correspondingly, the planar magnet group 21 is used to provide at least two magnets, which form a strong magnetic adsorption force with the adsorption assembly 13 while driving the movement of the rotor assembly 12, and provide a self-locking holding force when the aperture is in the target position. In order to achieve better results, in some embodiments of the present application, the planar magnet group 21 includes a first magnet 211, a second magnet 212, a third magnet 213 and a fourth magnet 214, which are arranged one by one above the coil group 22 corresponding to the first coil, the second coil, the third coil and the fourth coil.

[0067] It is worth noting that, in order to ensure that the planar magnet group 21 can be correctly driven by the coil group 22, the magnetic pole directions of the first magnet 211, the second magnet 212, the third magnet 213 and the fourth magnet 214 should be consistent in clockwise or counterclockwise direction and arranged around the base 112.

[0068] It is worth mentioning that, compared with the planar magnet layout of the traditional variable aperture, the multi-segment layout adopted in some embodiments of the present application provides a buffer space for thermal expansion between the gaps of each independent magnet. When the temperature rises, the magnets can collide in the direction of the gap to avoid internal stress accumulation; when the temperature shrinks, the gap allows shrinkage without tension.

[0069] Further, the multi-segment magnet layout makes the planar magnet group 21 break the vibration wave when it encounters vibration, reducing the resonance amplitude of the overall structure and avoiding local damage, further improving the reliability of the planar magnet group 21.

[0070] In some embodiments of the present application, the planar magnet group 21 is arranged in a three-segment structure, which is arranged in a ring shape above the coil group 22 and includes a first magnet 211, a second magnet 212 and a third magnet 213. The magnetic pole directions of the first magnet 211, the second magnet 212 and the third magnet 213 are arranged consistently. Compared with the four-segment design, the three-segment design increases the length of a single magnet segment, and the magnetic field distribution is more uniform, which helps to improve the stability of the driving force and adapt to longer single-step driving stroke.

[0071] Further, compared with the four-segment layout, the three-segment layout used in some embodiments of the present application prolongs the single magnet on the basis of the original, and also reduces the number of gaps of the planar magnet group 21, so that the magnetic field changes more gently, the driving force fluctuation is small, and the rotation of the planar magnet group 21 is further more stable.

[0072] It can be understood that in the present embodiment, the planar magnet group 21 and the coil group 22 mainly function to drive the rotor assembly 12 to move through electromagnetic force, and the number of internal sub-elements of the planar magnet group 21 can be increased or decreased according to the needs, and those skilled in the art can use the same or similar principle solutions according to the principle and their own situation to meet their own needs.

[0073] In some embodiments of the present application, the adsorption assembly 13 includes a protrusion group 132, which cooperates with the planar magnet group 21, so that the planar magnet group 21 is adsorbed on the adsorption assembly 13 when moving to the target gear position, adsorbing and fixing the rotor assembly 12, thereby achieving the effect of reducing or avoiding the shaking of the aperture blade 121.

[0074] In some embodiments of the present application, the protrusion group 132 is protrudingly arranged on the periphery of the base 112 and extends towards the rotor assembly 12. The protrusion group 132 includes at least one protrusion. In order to achieve better effect, the protrusion group 132 is implemented as a plurality of protrusions, including a first protrusion 1321, a second protrusion 1322, a third protrusion 1323 and a fourth protrusion 1324 in some embodiments of the present application. That is, each protrusion in the protrusion group 132 is arranged in the gap between the first magnet 211, the second magnet 212, the third magnet 213 and the fourth magnet 214, respectively, extending from the base 112 to the rotating carrier 122 until flush with the top side of the rotating carrier 122; the rotating carrier 122 is provided with a limiting groove at a corresponding position of each protrusion in the protrusion group 132, and the length of the limiting groove in the circumferential direction is greater than the length of each protrusion in the protrusion group 132 in the circumferential direction, for providing sufficient travel of the rotating carrier 122. It can be understood that the length of the limiting groove in the circumferential direction of the rotating carrier 122 determines the range of movement of the rotating carrier 122, and also determines the range of the aperture aperture that the aperture blade 121 can form. Those skilled in the art can adjust the parameter according to their own situation to meet their own needs. Generally, the circumferential length of the limiting groove should be controlled within the range of 5°-30°, which can meet the needs of aperture gear switching, and also will not cause the mechanical stability to decrease due to being too large.

[0075] In some embodiments of the present application, the first protruding part 1321, the second protruding part 1322, the third protruding part 1323 and the fourth protruding part 1324 are provided with magnetic attraction parts on both sides along the circumferential direction, which are used to increase the magnetic force on both sides of each unit in the protruding part group 132, thereby improving the adsorption effect. The magnetic attraction part is made of high magnetic permeability material, which can effectively gather and guide the magnetic force line, so that the magnetic adsorption force is concentrated on a specific position, preferably increasing the adsorption strength by more than twice, so that the aperture can still be stably locked at the target gear even in a strong vibration environment.

[0076] It can be understood that the protruding part group 132 in the present embodiment is used to fix the rotating carrier 122 to the base 112 when the rotating carrier 122 moves to the end point by adsorption with the planar magnet group 21. The number of protruding parts in the protruding part group 132 is related to the number of magnets in the planar magnet group 21. Those skilled in the art can adjust the number of protruding parts in the protruding part group 132 and the number of magnets in the planar magnet group 21 according to their own conditions to meet their own requirements.

[0077] In some embodiments of the present application, the adsorption assembly 13 further comprises an outer magnetic yoke 133, which is arranged on the periphery of the planar magnet group 21, covers the top side of the planar magnet group 21 and extends downward to the bottom side of the coil group 22, extends to the inner ring area of the base 112 at the bottom side of the coil group 22. The outer magnetic yoke 133 forms a semi-enclosed structure to accommodate the coil group 22 and the planar magnet group 21 in the semi-enclosed structure, which can form an efficient magnetic field shielding to prevent external magnetic field interference and internal magnetic field leakage.

[0078] In some embodiments of the present application, the adsorption assembly 13 further comprises a plurality of magnetic conductive members 131, which include a first magnetic conductive member 1311, a second magnetic conductive member 1312, a third magnetic conductive member 1313 and a fourth magnetic conductive member 1314, which are arranged on the side of the first magnet 211, the second magnet 212, the third magnet 213 and the fourth magnet 214 along the circumferential direction, respectively. The magnetic conductive member 131 further includes corresponding left and right magnetic conductive members, which are arranged on both sides of the magnets in the planar magnet group 21 along the circumferential direction, which are used to form an efficient magnetic circuit, significantly enhance the magnetic field strength generated by the planar magnet group 21, and further improve the adsorption effect of the magnetic attraction parts of the planar magnet group 21 and the protruding part group 132.

[0079] It can be understood that the magnetic conductive member 131 in the embodiment has the function of enhancing the magnetic field strength generated by the planar magnet group 21 and improving the adsorption effect. The number of the magnetic conductive member 131 depends on the number of magnets in the planar magnet group 21, and is preferably twice the number of magnets in the planar magnet group 21. Those skilled in the art can increase or decrease the number of sub-units in the magnetic conductive member 131 according to the principle and their own situation to meet their own needs.

[0080] In some embodiments of the present application, the camera module applies a specific working current to the coil group 22, so that the coil group 22 is energized and generates a controllable electromagnetic field. The planar magnet group 21 is driven by the electromagnetic force from the coil group 22 to move the rotating carrier 122 in the circumferential direction. The rotor assembly 12 moves in the guide mechanism formed by the stator assembly 11 and the annular groove of the rotor assembly 12 and the balls in the ball structure 141, and rotates along the arc direction of the annular groove. The aperture blade 121 is driven by the connecting rod 1221 in the rotating carrier 122 of the rotor assembly 12 to open and close, so as to realize the enlargement or reduction of the aperture.

[0081] In some embodiments of the present application, when the rotating carrier 122 is rotated to a certain position under the action of the magnetic force, the protruding part group 132 abuts against the side wall of the limiting groove in the rotating carrier 122, and the rotating carrier 122 continues to move in the same direction, so that the aperture blade 121 can continue to maintain the current opening and closing size. The planar magnet group 21 is driven by the rotating carrier 122 to approach the protruding part group 132, and finally the planar magnet group 21 is adsorbed with the protruding part group 132 under the action of the magnetic force, so as to fix the rotating carrier 122 at the current position and ensure that the aperture blade 121 will not be shaken by external impact or vibration.

[0082] In some embodiments of the present application, when the camera module applies a reverse working current to the coil group 22, the planar magnet group 21 moves in the opposite direction under the action of electromagnetic force, thereby driving the rotor assembly 12 to rotate in the opposite direction. When the rotor assembly 12 rotates to the target gear position, the protruding part group 132 will abut against the opposite side walls of the limiting groove, forming physical limiting to prevent the rotor assembly 12 from continuing to move. At this time, the other side of the planar magnet group 21 is driven by the rotor assembly 12 to approach the corresponding side of the protruding part group 132, and the magnet units in the planar magnet group 21 form an efficient magnetic circuit with the magnetic conductive member 131. Specifically, the left and right magnetic conductive members in the magnetic conductive member 131 are precisely aligned with the magnetic attraction parts of the protruding part group 132, respectively, to form a closed magnetic loop, greatly enhancing the magnetic flux density and generating strong adsorption force between the planar magnet group 21 and the protruding part group 132, thereby firmly locking the rotor assembly 12 in the current position. The cooperative working mechanism of the magnetic conductive member 131 and the protruding part group 132 ensures that the light circle blade 121 can maintain stable gear position even when the vehicle is subjected to severe bumps, effectively preventing shaking caused by external impact.

[0083] In some embodiments of the present application, when the coil group 22 encounters an unexpected situation or is actively powered off, the magnetic circuit system formed between the planar magnet group 21, the magnetic conductive member 131 and the protruding part group 132 still maintains an efficient working state. Due to the high magnetic permeability characteristics of the magnetic conductive member 131, even without the assistance of an electromagnetic field, it can still guide and enhance the permanent magnetic field generated by the planar magnet group 21, so that the magnetic lines of force are highly concentrated at the magnetic attraction part position of the protruding part group 132, maintaining strong static adsorption force. In the prior art, when the traditional magnetic force driven light circle is used on an automotive product, it is easily affected by bumps and vibrations, causing the variable aperture to shake, thereby affecting the overall picture effect; at the same time, the magnetic attraction reset element of the traditional planar magnet coil light circle is located on the ground, which requires continuous current to generate magnetic force to resist external force, thereby increasing the power consumption of the camera module, and the heat generated by the coil may cause thermal drift; the traditional gear transmission light circle relies on gear meshing to transmit torque and maintain position, and when it is shaken violently, the small gap or elastic deformation of the gear part can easily cause gear backlash, which is transmitted to the light circle blade 121 as a small and rapid change in aperture. However, the vehicle-mounted lens module often adopts long exposure form, and the change or shaking of the aperture will cause the brightness of the collected image to change rapidly, thereby causing unclear imaging, so the above structure realizes the zero-power self-locking feature, which not only greatly reduces the system energy consumption, but also eliminates the problem of thermal drift caused by long-term power-on of the coil, thereby improving the long-term stability of the imaging quality.

[0084] Compared with the prior art, the scheme in the part of the embodiments of the present application utilizes the strengthened static magnetic attraction force from the sidewall direction between the planar magnet group 21 and the magnetic guide 131 and the protruding part group 132 to keep the aperture position. In the state that the coil group 22 is powered off, only the magnetic field of the planar magnet group 21 can generate the adsorption force to tightly adsorb the magnetic guide 131 on the corresponding protruding part group 132, so that the position locking of the aperture blade 121 is realized without continuous power supply. At the same time, the protruding part group 132 can also play a role in physically limiting the rotation carrier 122, so that the position of the aperture blade 121 is more accurate, and the imaging quality is further improved.

[0085] In addition, the part of the embodiments of the present application also discloses a camera module, which comprises a photosensitive assembly, a lens assembly kept on the photosensitive path of the photosensitive assembly and the anti-shock variable aperture in any one of the above embodiments, wherein the anti-shock variable aperture is arranged on the light entrance side of the lens assembly.

[0086] In summary, the scheme in the part of the embodiments of the present application has stronger anti-shock and anti-shake performance compared with the prior art, and also has the function of power-off self-locking, which is suitable for use in the environment such as vehicles and engineering equipment that is easy to produce jolt and vibration.

[0087] The above describes the basic principles, main features and advantages of the present application. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A shockproof iris diaphragm characterized by comprising: The application relates to a stator assembly, a rotor assembly movably mounted inside the stator assembly and rotatable relative to the stator assembly, a transmission mechanism mounted between the stator assembly and the rotor assembly and assisting the rotor assembly in relative movement relative to the stator assembly, an electromagnetic driving module comprising a plurality of coils arranged at the bottom of the stator assembly and used for generating electromagnetic driving force, a planar magnet group arranged at the rotor assembly and comprising at least two magnets and facing upwards relative to the coils to interact with the coils and drive the rotor assembly to move, and an adsorption assembly comprising at least one protruding part arranged at the stator assembly and cooperating with the planar magnet group to enable the stator assembly and the rotor assembly to be fixed at a target gear position. The protruding part is arranged at a gap position between adjacent magnets of the planar magnet group and extends from the stator assembly to the rotor assembly to generate adsorption force with the planar magnet group at a position where the magnetic field is the strongest. The left and right sides of the protruding part are respectively provided with magnetic attraction parts made of high magnetic permeability material and arranged corresponding to the magnetic pole direction of the planar magnet group to gather magnetic force lines and significantly enhance the local magnetic field strength. The adsorption assembly further comprises magnetic conductive parts, each of which comprises a left magnetic conductive part and a right magnetic conductive part arranged at the two sides of each magnet of the planar magnet group and corresponding to the magnetic attraction parts of the protruding part to form a complete magnetic force closed loop system. The adsorption assembly further comprises an outer magnetic yoke in a semi-enclosing structure surrounding the top surface, the bottom and the peripheral side wall of the planar magnet group to form a closed magnetic circuit to enhance the magnetic field strength and prevent magnetic field leakage from interfering with surrounding electronic elements. The planar magnet group comprises at least three annularly arranged magnets with gaps arranged between adjacent magnets. The rotor assembly comprises at least two light ring blades and at least two connecting rods which are circumferentially and symmetrically distributed on the rotor assembly and used for connecting with the light ring blades and driving the light ring blades to move. The non-optical edges of the light ring blades are provided with pin holes to form a rotating pair with the connecting rods so that the light ring blades can rotate around the connecting rods. The transmission mechanism comprises a ball structure, the stator assembly is provided with an annular slope groove, the lower surface of the rotor assembly is provided with a corresponding annular slope groove, the ball structure is contained between the two annular slope grooves, and the annular slope grooves have inclined inner walls to form optimized assembly positioning accuracy. The stator assembly comprises a shell and a base, the coils are arranged at the bottom of the base, the central region of the base is provided with a light passing hole coaxial with an optical axis, and the shell is in a barrel-shaped structure surrounding the base. The coils comprise at least three fan-shaped coil units, the planar magnet group comprises magnet units equal in number to the coil units, and the magnet units correspond to the coil units one by one to ensure uniform distribution of driving force and reduce eccentricity error during light ring movement. The application further relates to a light sensing assembly.

2. The shock mounted iris diaphragm of claim 1 wherein, ​ 3. The shock mounted iris diaphragm of claim 2 wherein, ​ 4. The shock mounted iris diaphragm of claim 3 wherein, ​ 5. The shock mounted iris diaphragm of claim 3 wherein, ​ 6. The shock mounted iris diaphragm of claim 1 wherein, ​ 7. The shock mounted iris diaphragm of claim 6 wherein, ​ 8. An image capture module, comprising: ​ ​ a lens assembly held in a light path of the light sensing assembly; The shockproof iris diaphragm according to any one of claims 1 to 7, wherein the shockproof iris diaphragm is disposed on a light entrance side of the lens assembly.

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