Lens aperture adjusting device

Abstract

The invention belongs to the technical field of electronic equipment, and particularly relates to a lens aperture adjusting device, which comprises a base; the movable seat is rotatably arranged on the base around the axis, and the movable seat and the base are provided with lens avoiding holes matched with the lens along the axis; the light absorption piece shields the lens avoiding hole in the base, and the light absorption piece is provided with a center hole; the two shielding blades are arranged above the base and the movable seat in a central symmetry mode, the shielding blades are rotatably connected to the base in the direction parallel to the axis, and when the movable seat rotates around the axis to drive the two shielding blades to rotate, the two shielding blades form an aperture adjusting hole with the variable diameter above the light absorption piece. Through the combined design of the light absorption piece and the two shielding blades, when the movable base rotates, the size of the lens aperture can be well adjusted, and the purpose of the variable aperture is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of electronic devices, and particularly relates to a lens aperture adjusting device. Background Art

[0002] For the camera aperture, in a place with strong light, the camera can obtain a deeper depth of field and a sharper picture by reducing the aperture. While in a place with insufficient light, increasing the aperture can increase the light intake, and thus a cleaner picture with higher exposure and lower noise can be obtained. In the field of electronic devices, generally, the camera of an electronic device cannot change the aperture size. Therefore, it is impossible to adapt to various shooting environments by changing the aperture. As a result, many electronic devices have overexposure situations outdoors in strong sunlight, while underexposure occurs during night shooting, with a dim picture and high noise, resulting in loss of details. In order to meet the user's photography needs, a physically variable aperture is very important for shooting.

[0003] In view of this, those skilled in the art need to develop a new type of variable aperture to overcome the above technical problems. Summary of the Invention

[0004] Aiming at the above technical problems, the present invention aims to provide a lens aperture adjusting device.

[0005] A lens aperture adjusting device, the lens aperture adjusting device includes:

[0006] A base;

[0007] A movable seat, the movable seat is rotatably arranged on the base around an axis, and the movable seat and the base are provided with lens avoidance holes for cooperating with a lens along the axis;

[0008] A light absorbing sheet, the light absorbing sheet covers the lens avoidance hole on the base, and the light absorbing sheet has a central hole;

[0009] Two shielding blades, the two shielding blades are symmetrically arranged above the base and the movable seat, the shielding blades are rotatably connected to the base around a direction parallel to the axis, and when the movable seat rotates around the axis to drive the two shielding blades to rotate, the two shielding blades form an aperture adjusting hole with a variable diameter above the light absorbing sheet.

[0010] Optionally, the two shielding blades are arranged in an overlapping and staggered manner.

[0011] Optionally, the shielding blade is provided with a first blade hole and a second blade hole that communicate with each other, the diameter of the first blade hole is not greater than the diameter of the central hole of the light absorbing sheet, and the diameter of the second blade hole is greater than the diameter of the central hole of the light absorbing sheet;

[0012] When the first blade holes on the two shielding blades enclose to form the aperture adjustment hole, the aperture adjustment hole is not larger than the central hole of the light absorbing sheet, and the aperture adjustment hole serves as the lens aperture hole;

[0013] When the second blade holes on the two shielding blades enclose to form the aperture adjustment hole, the aperture adjustment hole is larger than the central hole of the light absorbing sheet, and the central hole of the light absorbing sheet serves as the lens aperture hole.

[0014] Optionally, a support protrusion is provided on the base, the movable seat is sleeved outside the support protrusion, the support protrusion has the lens avoidance hole, a light absorbing sheet mounting groove is provided at the top of the support protrusion, the light absorbing sheet mounting groove is annular and communicates with the lens avoidance hole, and the light absorbing sheet is mounted in the light absorbing sheet mounting groove.

[0015] Optionally, a fixing pin hole is provided on the shielding blade, a support protrusion is provided on the base, the movable seat is sleeved outside the support protrusion, a fixing pin shaft is provided at the top of the support protrusion, and the fixing pin shaft is rotationally connected to the fixing pin hole;

[0016] A movable pin hole is provided on the shielding blade, a movable pin shaft is provided at the top of the movable seat, the movable pin shaft is connected to the movable pin hole on the shielding blade, and when the movable seat rotates, the movable pin shaft drives the shielding blade to rotate around the axis of the fixing pin shaft, so that the diameter of the aperture adjustment hole changes.

[0017] Optionally, a heightening platform is provided at the top of the movable seat, one of the movable pin shafts is provided on the heightening platform, and the movable pin shaft located on the heightening platform is connected to the movable pin hole of the shielding blade located above.

[0018] Optionally, the movable pin hole is located at the first end of the shielding blade, the first blade hole and the second blade hole are located at the second end of the shielding blade far from the first end, and the fixing pin hole is located between the first end and the second end.

[0019] Optionally, the movable pin hole is an oval hole.

[0020] Optionally, the movable pin hole is an oval hole extending along or parallel to the tangent direction of the central hole of the light absorbing sheet.

[0021] Optionally, the fixing pin hole is a circular hole.

[0022] Optionally, a plurality of fixing protrusions are circumferentially arranged on the edge of the base, a limiting groove for avoiding the fixing protrusions is arranged on the edge of the movable seat, and the circumferential length of the limiting groove is greater than that of the fixing protrusion.

[0023] Optionally, a plurality of fixing protrusions are circumferentially arranged on the edge of the base, the fixing protrusions are located outside the movable seat, and a mounting shaft is arranged at the top end of the fixing protrusion;

[0024] The lens aperture adjusting device further includes a top cover, the top cover is fixedly connected to the mounting shaft, an activity space is formed between the top cover and the base, and a lens avoidance hole for cooperating with the lens is arranged on the top cover, the movable seat and the base along the axis;

[0025] The movable seat and the two shielding blades are both arranged in the activity space and can rotate in the activity space.

[0026] Optionally, a plurality of fixing protrusions are circumferentially arranged on the edge of the base, a support platform is arranged on the inner wall of the fixing protrusion, and the movable seat is placed on the support platform.

[0027] Optionally, a ball placement groove is arranged on the support platform, balls are placed in the ball placement groove, and the bottom end of the movable seat abuts against the balls.

[0028] Optionally, the lens aperture adjusting device further includes a circuit board, the circuit board is arranged at the top end of the base and below the movable seat, a driving coil is arranged in the circuit board, and a magnet is arranged at the bottom end of the movable seat opposite to the driving coil, and the movable seat is rotated around the axis by the cooperation of the magnet and the driving coil.

[0029] Optionally, the circuit board is an FPC board.

[0030] Optionally, the circuit board is powered by a pin component arranged on the base, and the pin component is connected to an external circuit.

[0031] Optionally, the base, the support protrusion, the movable seat, the light absorbing sheet and the circuit board are all in a circular ring structure.

[0032] Optionally, when there are fixing protrusions on the base, an avoidance groove for avoiding the fixing protrusions is arranged on the edge of the circuit board.

[0033] Optionally, at least one positioning groove is arranged in the avoidance groove, a positioning protrusion matched with the positioning groove is arranged at the upper end of the base, and the positioning of the circuit board on the base is realized by inserting or clamping the positioning protrusion and the positioning groove.

[0034] Optionally, a magnetic attraction member is provided at the bottom end of the base, and an attractive force is generated between the magnetic attraction member and the magnet at the bottom end of the movable seat, so that the movable seat is tightly abutted against the base.

[0035] Optionally, the magnetic attraction member is a bottom iron ring, and an annular iron ring installation groove is provided at the bottom end of the base, and the bottom iron ring is installed in the iron ring installation groove.

[0036] Beneficial effects: Through the combined design of the light absorbing sheet and the two shielding blades, when the movable seat rotates, the aperture of the lens can be better adjusted to achieve the purpose of variable aperture. Description of the Drawings

[0037] Figure 1 is a schematic structural diagram of the present invention;

[0038] Figure 2 is Figure 1 the top view of;

[0039] Figure 3 is Figure 2 the A-A cross-sectional view of;

[0040] Figure 4 is Figure 1 the exploded view of;

[0041] Figure 5 is Figure 4 the further exploded view of;

[0042] Figure 6 is a schematic structural diagram of the two shielding blades of the present invention;

[0043] Figure 7 is a position relationship diagram among the base, the movable seat, the light absorbing sheet and the circuit board of the present invention;

[0044] Figure 8 is Figure 7 the exploded view from another angle of;

[0045] Figure 9 is Figure 8 the further exploded view of;

[0046] Figure 10 is a position relationship diagram among the base, the light absorbing sheet and the circuit board of the present invention;

[0047] Figure 11 is Figure 10 the exploded view of;

[0048] Figure 12 is Figure 10 the partial exploded view of;

[0049] Figure 13 This is an exploded view of the positional relationship between the base of the present invention and the bottom iron ring. Specific embodiments

[0050] The following will describe in detail the preferred embodiments of the present invention with reference to the accompanying drawings, so as to more clearly understand the purpose, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not limitations on the scope of the present invention, but only to illustrate the essential spirit of the technical solution of the present invention.

[0051] In the following description, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the relevant art will recognize that the embodiments may be practiced without one or more of these specific details. In other instances, well-known devices, structures, and techniques associated with the present application may not be shown or described in detail so as not to unnecessarily obscure the description of the embodiments.

[0052] References to "one embodiment" or "an embodiment" throughout the specification mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of "in one embodiment" or "in an embodiment" throughout the specification are not necessarily all referring to the same embodiment. Additionally, the particular features, structures, or characteristics may be combined in any manner in one or more embodiments.

[0053] In the following description, in order to clearly show the structure and working mode of the present invention, many directional terms will be used for description. However, words such as "front", "rear", "left", "right", "outer", "inner", "outward", "inward", "up", "down", etc. should be understood as convenient terms and should not be understood as limiting terms.

[0054] Refer to Figures 1 to 13 , an embodiment of the present invention provides a lens aperture adjusting device, which is used to be sleeved on a lens to adjust the aperture size. The lens aperture adjusting device includes a base 10, a movable seat 20, two shielding blades 30, and a light absorbing sheet 40.

[0055] The base 10 is used to be fixed on the outer shell of the lens motor.

[0056] The movable seat 20 is rotatably arranged on the base 10 around the axis. The movable seat 20 and the base 10 are provided with lens avoidance holes along the axis for cooperating with the lens, so that light can enter the lens. The lens avoidance holes are usually circular. The diameters of the lens avoidance holes on the movable seat 20 and the base 10 can be the same or different. Of course, each lens avoidance hole is larger than the central hole of the light absorbing sheet. The lens avoidance holes are located at the central positions of the movable seat 20 and the base 10. This axis is the center line after the combination of the base 10 and the movable seat 20, that is, the axis of the lens avoidance holes.

[0057] The light absorbing sheet 40 shields the lens avoidance hole on the base 10. The light absorbing sheet 40 has a central hole 40a, and the central hole 40a is a through hole that is axially connected. The light absorbing sheet 40 can be arranged inside the lens avoidance hole on the base 10 or outside the lens avoidance hole on the base 10. The central hole 40a of the light absorbing sheet 40 can define the maximum aperture hole range and prevent excessive light from entering the lens, improving the aperture adjustment effect.

[0058] Two shielding blades 30 are symmetrically arranged above the base 10 and the movable seat 20. The shielding blades 30 are rotatably connected to the base 10 around a direction parallel to the axis. When the movable seat 20 rotates around the axis to drive the two shielding blades 30 to rotate, the two shielding blades 30 form a variable-diameter aperture adjustment hole 30a above the light absorbing sheet 40. Specifically, the movable seat 20 is respectively connected to each shielding blade 30. When the movable seat 20 rotates around the axis to drive the two shielding blades 30 to rotate respectively, the two shielding blades 30 rotate relatively, so that the aperture adjustment hole 30a formed by the two changes. Since the opening size of the aperture adjustment hole 30a changes, the light entering the lens changes accordingly, thereby realizing the shielding of the lens and the adjustment operation of the lens aperture.

[0059] In one embodiment, the two shielding blades 30 are arranged in a staggered and overlapping manner. That is to say, during the rotation of the two shielding blades 30, there is partial overlap between them.

[0060] Refer to Figure 4 , when the movable seat 20 drives the two shielding blades 30 to rotate clockwise respectively, the staggered and overlapping part of the two shielding blades 30 gradually decreases, and the aperture adjustment hole 30a gradually becomes smaller; when the movable seat 20 drives the two shielding blades 30 to rotate counterclockwise respectively, the staggered and overlapping part of the two shielding blades 30 gradually increases, and the aperture adjustment hole 30a gradually becomes larger.

[0061] In one embodiment, refer to Figure 6, the shielding blade 30 is provided with a first blade hole 31 and a second blade hole 32 that are interconnected. Both the first blade hole 31 and the second blade hole 32 are through holes that communicate axially. Both the first blade hole 31 and the second blade hole 32 are through holes that are closed on the shielding blade 30, and after they are interconnected, they form a closed special-shaped hole. The diameter of the first blade hole 31 is not greater than the diameter of the central hole 40a of the light-absorbing sheet 40, and the diameter of the second blade hole 32 is greater than the diameter of the central hole 40a of the light-absorbing sheet 40.

[0062] When the two shielding blades 30 are staggered and overlapped, during the rotation process of the adjustment regions of the two shielding blades 30 that have the first blade hole 31 and the second blade hole 32, spatial overlap can be achieved. When the two shielding blades 30 perform a rotation action, there are two states where the first blade holes 31 overlap in space and two states where the second blade holes 32 overlap in space. Therefore, the area of the regional hole formed by the combination of the first blade hole 31 and the second blade hole 32 also changes accordingly.

[0063] When the first blade holes 31 on the two shielding blades 30 are combined with each other, the two first blade holes 31 enclose a small-area circular hole as the aperture adjustment hole 30a. Since the diameter of the first blade hole 31 is not greater than the diameter of the central hole 40a of the light-absorbing sheet 40, this small-area circular hole is less than or equal to the central hole 40a of the light-absorbing sheet 40. At this time, the lens aperture hole is this small-area circular hole. When the second blade holes 32 on the two shielding blades 30 are combined with each other, the two second blade holes 32 enclose a large-area circular hole as the aperture adjustment hole 30a. Since the diameter of the second blade hole 32 is greater than the diameter of the central hole 40a of the light-absorbing sheet 40, this large-area circular hole is greater than the central hole 40a on the light-absorbing sheet 40. At this time, the lens aperture hole is the central hole 40a of the light-absorbing sheet 40.

[0064] In one embodiment, referring to Figure 3 , Figure 7 , Figures 10 to 12 , the base 10 is provided with a support protrusion 11. The movable seat 20 is arranged around the outside of the support protrusion 11. The support protrusion 11 has a lens avoidance hole 10a of the base 10. A light-absorbing sheet 40 with a light-absorbing effect is arranged between the top end of the support protrusion 11 and the shielding blade 30. The top end of the support protrusion 11 is provided with a light-absorbing sheet installation groove 12. The light-absorbing sheet installation groove 12 is arranged around and communicates with the lens avoidance hole 10a. The light-absorbing sheet 40 is installed in the light-absorbing sheet installation groove 12.

[0065] In one embodiment, referring to Figure 6 , the shielding blade 30 is provided with a fixing pin hole 33.

[0066] Referring to Figure 4 , Figure 7 , Figures 10 to 12, a support protrusion 11 is provided on the base 10, the movable seat 20 is disposed around the outside of the support protrusion 11, a fixed pin shaft 13 is provided at the top of the support protrusion 11, and the fixed pin shaft 13 is rotatably connected to the fixed pin hole 33. As a result, the shielding blade 30 is rotatably connected to the support protrusion 12 of the base 10 around the axial direction of the fixed pin shaft 13 (that is, Figure 4 the up and down direction in

[0067] . The number of the fixed pin shafts 13 is not less than the number of the shielding blades 30, so that one shielding blade 30 can be rotatably connected to a corresponding fixed pin shaft 13. For example, if there are two shielding blades 30, the number of the fixed pin shafts 13 is also two correspondingly, and the two fixed pin shafts 13 are symmetrically arranged along the circumferential direction at the top of the support protrusion 12.

[0068] The fixed pin hole 33 is preferably a circular hole that is rotatably connected to the fixed pin shaft 13.

[0069] Referring to Figure 6 , an activity pin hole 34 is provided on the shielding blade 30, an activity pin shaft 21 is provided at the top of the movable seat 20, the activity pin shaft 21 is connected to the activity pin hole 34 on the shielding blade 30, and when the movable seat 20 rotates, the activity pin shaft 21 drives the shielding blade 30 to rotate around the axial direction of the fixed pin shaft 13, so as to change the diameter of the aperture adjustment hole 30a.

[0070] The number of the activity pin shafts 21 is not less than the number of the shielding blades 30, so that one shielding blade 30 can be connected to a corresponding activity pin shaft 21. For example, if there are two shielding blades 30, the number of the activity pin shafts 21 is also two correspondingly. The two activity pin shafts 21 are symmetrically arranged along the circumferential direction at the top of the movable seat 20.

[0071] The activity pin hole 34 is preferably an oval hole. The activity pin hole 34 is more preferably an oval hole extending along or parallel to the tangent direction of the central hole 40a of the light absorbing sheet 40.

[0072] In an embodiment, referring to Figure 4 、 Figure 5 and Figure 7 , a heightening platform 22 is provided at the top of the movable seat 20, one of the activity pin shafts 21 is provided on the heightening platform 22, and the activity pin shaft 21 located on the heightening platform 22 is connected to the activity pin hole 34 of the shielding blade 30 located above.

[0073] In this embodiment, by providing the heightening platform 22 at the top of the movable seat 20, the effect that the two shielding blades 30 are overlapped in height can be achieved.

[0074] In an embodiment, referring to Figure 6, the movable pin hole 34 is located at the first end of the shielding blade 30, the first blade hole 31 and the second blade hole 32 are located at the second end of the shielding blade 30 away from the first end, and the fixed pin hole 33 is located between the first end and the second end.

[0075] In one embodiment, referring to Figure 4 , Figure 5 and Figure 7 , a plurality of fixing protrusions 14 are circumferentially arranged on the edge of the base 10, a limiting groove 23 for avoiding the fixing protrusions 14 is arranged on the edge of the movable seat 20, and the circumferential length of the limiting groove 23 is greater than the circumferential length of the fixing protrusions 14.

[0076] As Figure 7 shown, when the movable seat 20 is placed on the base 10, the fixing protrusions 14 penetrate and extend out of the limiting groove 23. At this time, there is still a preset distance between the side wall of the fixing protrusions 14 and the inner side wall of the limiting groove 23. This preset distance is the maximum rotation amplitude of the movable seat 20. That is to say, the limiting groove 23 limits the maximum rotation angle of the movable seat 20.

[0077] In one embodiment, referring to Figures 3 to 5 , Figures 7 to 11 , a plurality of fixing protrusions 14 are circumferentially arranged on the edge of the base 10. The fixing protrusions 14 are located outside the movable seat 20, and a mounting shaft 15 is arranged at the top of the fixing protrusions 14.

[0078] Referring to Figures 3 to 5 , Figure 11 , the lens aperture adjusting device further includes a top cover 50. The top cover 50 is fixedly connected to the mounting shaft 15. An activity space is formed between the top cover 50 and the base 10. The top cover 50, the movable seat 20 and the base 10 are provided with lens avoidance holes for cooperating with the lens along the axis. The lens avoidance hole on the top cover 50 can be the same as or different from the lens avoidance holes on the movable seat 20 and the base 10. Of course, each lens avoidance hole is larger than the central hole 40a of the light absorbing sheet 40. The movable seat 20 and the two shielding blades 30 are both arranged in the activity space and can rotate in the activity space.

[0079] During specific implementation, each lens avoidance hole is located at the central position of each component, and the central positions of the base 10, the movable seat 20, the light absorbing sheet 40 and the top cover 50 all correspond to the lens on the lens motor.

[0080] When the top cover 50 is fixedly connected to the mounting shaft 15, a connection hole can be dug on the top cover 50, and the top cover 50 is fixedly connected to the mounting shaft 15 by fixedly connecting through the connection hole.

[0081] The number of mounting shafts 15 provided at the top of the fixed protrusions 14 can be determined according to actual needs. For example, one, two, or several mounting shafts can be provided. The top cover 50 is provided with the same number of connection holes as the mounting shafts 15 to achieve their fixed connection.

[0082] In one embodiment, referring to Figures 3 to 5 , Figures 7 to 11 , a plurality of fixed protrusions 14 are circumferentially provided on the edge of the base 10. A support platform 16 is provided on the inner wall of the fixed protrusion 14, and the movable seat 20 is placed on the support platform 16.

[0083] In this embodiment, the base 10 supports the movable seat 20 through the support platform 16.

[0084] In one embodiment, referring to Figures 10 to 12 , a ball placement groove 161 is provided on the support platform 16. A ball is placed in the ball placement groove 161, and the bottom end of the movable seat 20 abuts against the ball.

[0085] In this embodiment, the movable seat 20 is supported by the ball placement groove 161 provided on the support platform 16 to reduce the frictional resistance of the movable seat 20. Alternatively, the movable seat 20 can be directly placed on the support platform 16, and it rotates by overcoming the frictional force between the two during movement.

[0086] In one embodiment, referring to Figures 3 to 5 , Figures 7 to 11 , the lens aperture adjusting device further includes a circuit board 60. The circuit board 60 is provided at the top end of the base 10 and below the movable seat 20. A drive coil is provided in the circuit board 60, and a magnet 70 opposite to the drive coil is provided at the bottom end of the movable seat 20. The magnet 70 and the drive coil cooperate to make the movable seat 20 rotate around the axis.

[0087] In this embodiment, the magnet 70 and the drive coil constitute a drive mechanism for driving the movable seat 20 to rotate around the axis.

[0088] In one embodiment, the circuit board 60 is an FPC board.

[0089] In one embodiment, the circuit board 60 is powered by a pin component 61 provided on the base 10, and the pin component 61 is connected to an external circuit.

[0090] In one embodiment, the base 10, the support protrusion 11, the movable seat 20, the light absorbing sheet 40, and the circuit board 60 are all in a circular ring structure.

[0091] Therefore, the movable seat 20 is sleeved outside the support protrusion 11 and located on the base 10, and the movable seat 20 can rotate on the base 10 around the outside of the support protrusion 11.

[0092] Of course, the base 10, the supporting protrusion 11, the movable seat 20, the light absorbing sheet 40, and the circuit board 60 can also be of other structures. For example, the outer contour is a polygonal structure. However, corresponding holes are provided in the middle of the base 10, the supporting protrusion 11, the movable seat 20, the light absorbing sheet 40, and the circuit board 60 to facilitate the formation of the lens avoidance holes.

[0093] In one embodiment, the base 10 and the supporting protrusion 11 are integrally formed.

[0094] In one embodiment, referring to Figure 11 , when the fixing protrusion 14 is provided on the base 10, an avoidance groove 62 for avoiding the fixing protrusion 14 is provided at the edge of the circuit board 60.

[0095] In one embodiment, referring to Figure 11 , at least one positioning groove 63 is provided in the avoidance groove 62, and a positioning protrusion 17 matching the positioning groove 63 is provided at the upper end of the base 10. The positioning protrusion 17 is inserted or clamped with the positioning groove 63 to realize the positioning of the circuit board 60 on the base 10, so as to ensure the connection stability between the circuit board 60 and the base 10.

[0096] In one embodiment, a magnetic component is provided at the bottom end of the base 10. An attractive force is generated between the magnetic component and the magnet 70 at the bottom end of the movable seat 20, so that the movable seat 20 is tightly abutted against the base 10, improving the connection structure stability between the base 10 and the movable seat 20. At the same time, when balls are provided between the support platform 16 and the movable seat 20, this design structure can prevent the balls from coming out of the groove.

[0097] In one embodiment, referring to Figure 13 , the magnetic component is a bottom iron ring 18. An annular iron ring installation groove 19 is provided at the bottom end of the base 10, and the bottom iron ring 18 is installed in the iron ring installation groove 19. An attractive force is generated between the bottom iron ring 18 and the magnet 70 fixedly installed at the bottom end of the movable seat 20, so that the movable seat 20 can be tightly abutted against the base 10.

[0098] The preferred embodiments of the present invention have been described in detail above. However, it should be understood that after reading the above teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention. These equivalent forms also fall within the scope defined by the appended claims of this application.

Claims

1. A lens aperture adjustment device, characterized in that: The lens aperture adjustment device comprises: Base; A movable seat, the movable seat is rotatably arranged on the base around an axis, and the movable seat and the base are provided with a lens avoidance hole matched with the lens along the axis; A light absorbing sheet, the light absorbing sheet shielding the lens avoidance hole on the base, the light absorbing sheet having a central hole; Two shielding blades are symmetrically arranged above the base and the movable seat, and the shielding blades are rotatably connected to the base around a direction parallel to the axis. When the movable seat rotates around the axis to drive the two shielding blades to rotate, the two shielding blades form an aperture adjustment hole with a variable diameter above the light absorbing sheet.

2. The lens aperture adjustment device according to claim 1, characterized in that: The two shielding blades are arranged in a staggered and overlapping manner; The shielding blade is provided with a first blade hole and a second blade hole which are interconnected, the diameter of the first blade hole is not larger than the diameter of the central hole of the light absorbing sheet, and the diameter of the second blade hole is larger than the diameter of the central hole of the light absorbing sheet; When the first blade holes on the two shielding blades are combined to form the aperture adjustment hole, the aperture adjustment hole is no larger than the central hole of the light absorbing sheet, and the aperture adjustment hole serves as the lens aperture hole; When the second blade holes on the two shielding blades are combined to form the aperture adjustment hole, the aperture adjustment hole is larger than the central hole of the light absorbing sheet, and the central hole of the light absorbing sheet serves as the lens aperture hole.

3. The lens aperture adjustment device according to claim 1, characterized in that: A supporting protrusion is arranged on the base, the movable seat ring is arranged on the outside of the supporting protrusion, the supporting protrusion has the lens avoidance hole, the top of the supporting protrusion is arranged with a light absorbing sheet installation groove, the light absorbing sheet installation groove is arranged around and connected with the lens avoidance hole, and the light absorbing sheet is installed in the light absorbing sheet installation groove.

4. The lens aperture adjustment device according to claim 1, characterized in that: The shielding blade is provided with a fixing pin hole, the base is provided with a supporting protrusion, the movable seat ring is provided on the outside of the supporting protrusion, the top of the supporting protrusion is provided with a fixing pin shaft, and the fixing pin shaft is rotatably connected with the fixing pin hole; A movable pin hole is provided on the shielding blade, and a movable pin shaft is provided on the top of the movable seat. The movable pin shaft is connected to the movable pin hole on the shielding blade. When the movable seat rotates, the movable pin shaft drives the shielding blade to rotate around the axial direction of the fixed pin shaft, thereby changing the diameter of the aperture adjustment hole.

5. The lens aperture adjustment device according to claim 4, characterized in that: The two shielding blades are arranged in a staggered and overlapping manner; a heightening platform is arranged on the top of the movable seat, one of the movable pin shafts is arranged on the heightening platform, and the movable pin shaft located on the heightening platform is connected to the movable pin hole of the shielding blade located above; And / or, the shielding blade is provided with a first blade hole and a second blade hole which are interconnected, the diameter of the first blade hole is not larger than the diameter of the center hole of the light absorbing sheet, and the diameter of the second blade hole is larger than the diameter of the center hole of the light absorbing sheet; the movable pin hole is located at the first end of the shielding blade, the first blade hole and the second blade hole are located at the second end of the shielding blade away from the first end, and the fixed pin hole is located between the first end and the second end; And / or, the movable pin hole is a waist-shaped hole; And / or, the movable pin hole is a waist-shaped hole extending along or parallel to the tangent direction of the central hole of the light-absorbing sheet; And / or, the fixing pin hole is a circular hole.

6. The lens aperture adjustment device according to claim 1, characterized in that: The edge of the base is provided with a plurality of fixed protrusions along the circumferential direction, and the edge of the movable seat is provided with a limiting groove for avoiding the fixed protrusions, and the circumferential length of the limiting groove is greater than the circumferential length of the fixed protrusions; And / or, a plurality of fixed protrusions are arranged along the circumferential direction on the edge of the base, the fixed protrusions are located outside the movable seat, and a mounting shaft is arranged on the top of the fixed protrusions; the lens aperture adjustment device also includes a top cover, the top cover is fixedly connected to the mounting shaft, an activity space is formed between the top cover and the base, and the top cover, the movable seat and the base are provided with the lens avoidance hole matched with the lens along the axis; the movable seat and the two shielding blades are arranged in the activity space and can rotate in the activity space; And / or, a plurality of fixing protrusions are arranged on the edge of the base along the circumferential direction, a supporting platform is arranged on the inner wall of the fixing protrusion, and the movable seat is placed on the supporting platform; And / or, a plurality of fixed protrusions are circumferentially arranged on the edge of the base, a support platform is arranged on the inner wall of the fixed protrusion, a ball placement groove is arranged on the support platform, balls are placed in the ball placement groove, and the bottom end of the movable seat abuts against the balls.

7. The lens aperture adjustment device according to any one of claims 1 to 6, characterized in that: The lens aperture adjustment device also includes a circuit board, which is arranged at the top of the base and below the movable seat. A driving coil is arranged in the circuit board, and a magnet arranged opposite to the driving coil is arranged at the bottom of the movable seat. The movable seat is rotated around the axis through the cooperation between the magnet and the driving coil.

8. The lens aperture adjustment device according to claim 7, characterized in that: The circuit board is an FPC board; And / or, the circuit board is powered by a pin member disposed on the base, and the pin member is connected to an external circuit; And / or, when a fixing protrusion is provided on the base, an avoidance groove for avoiding the fixing protrusion is provided on the edge of the circuit board; And / or, when a fixing protrusion is provided on the base, an avoidance groove is provided on the edge of the circuit board for avoiding the fixing protrusion, at least one of the avoidance grooves is provided with a positioning groove, and a positioning protrusion matching with the positioning groove is provided on the upper end of the base, and the positioning protrusion is plugged or snapped into the positioning groove to realize the positioning of the circuit board on the base.

9. The lens aperture adjustment device according to claim 7, characterized in that: A magnetic attraction piece is arranged at the bottom end of the base, and an attraction force is generated between the magnetic attraction piece and the magnet at the bottom end of the movable seat, so that the movable seat is closely abutted against the base.

10. The lens aperture adjustment device according to claim 9, characterized in that: The magnetic attraction component is a bottom iron ring, and a ring-shaped iron ring installation groove is arranged at the bottom end of the base, and the bottom iron ring is installed in the iron ring installation groove.

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