Variable aperture

Abstract

This application relates to the field of camera module technology, specifically disclosing a variable aperture. The variable aperture includes a housing, a rotating component rotatably connected to the housing, a driving component fixedly connected to the housing, and multiple blades. Each blade is rotatably connected to the rotating component and slidably connected to the housing. The multiple blades form an aperture with an adjustable diameter. One of the blades and the housing is provided with a guide groove, and the other is connected with a guide post. The guide post is inserted into the guide groove, and the outer diameter of the guide post is not less than the width of the guide groove. The guide post and the guide groove are interference-fitted, and the guide post is elastic. The guide post adapts to the width of the guide groove by generating elastic deformation. Furthermore, by making the guide post elastic, when the guide post slides along the guide groove, the amount of elastic deformation of the guide post can always remain stable at various positions of the guide groove. When adjusting the aperture diameter, the control accuracy of the aperture diameter can be significantly improved.

Description

Technical Field

[0001] This application relates to the field of camera module technology, and in particular to a variable aperture and camera module. Prior Technology

[0002] Electronic devices such as mobile phones and tablets are usually equipped with camera modules for taking photos or videos. A camera module typically includes an optical lens for imaging the scene being photographed, a motor for driving the optical lens to move, and a variable aperture located on the light-incident side of the optical lens.

[0003] In existing technology, a variable aperture typically includes a housing, a rotor rotatably mounted on the housing, a stator fixedly mounted on the housing, and multiple blades evenly distributed along the circumference of the rotor. Each blade has a guide groove, and the stator has multiple guide posts, which are slidably inserted into the guide grooves one-to-one. The first ends of the multiple blades are rotatably connected to the rotor, and the second ends of the multiple blades form an aperture. When the rotor rotates relative to the housing, the blades slide relative to the stator and rotate relative to the rotor under the drive of the rotor, thereby making the aperture diameter adjustable. However, the guide grooves and guide posts are usually clearance-fitted, which means that when the aperture diameter is adjusted to a specified size, the blade travel is uncontrollable, thus affecting the control accuracy of the aperture diameter.

[0004] To address this, existing technology provides a variable aperture with elastic holes on the blades. These elastic holes are located on one side of the guide groove, and elastic ribs are formed between the elastic holes and the guide groove. This allows for an interference fit between the guide groove and the guide post, and the elastic deformation of the ribs ensures that the guide post can slide within the guide groove, thereby improving the problem of uncontrollable blade travel when controlling the aperture size. However, the middle of the elastic rib is more prone to deformation than its ends. Therefore, when adjusting the aperture diameter, the control accuracy of the guide post's travel is relatively lower when the guide post stops at the middle of the elastic rib compared to when it stops at its ends, which to some extent affects the control accuracy of the aperture diameter.

[0005] Therefore, there is an urgent need for a variable aperture and camera module to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this application is to provide a variable aperture and camera module to improve the control accuracy of the aperture hole diameter.

[0007] On one hand, this application provides a variable aperture, which includes a housing, a rotating component rotatably connected to the housing, a driving component fixedly connected to the housing, and a plurality of blades, each blade being rotatably connected to the rotating component and slidably connected to the housing, the plurality of blades forming an aperture with an adjustable diameter; one of the blades and the housing is provided with a guide groove, the other of the two is connected with a guide post, the guide post is inserted into the guide groove, the outer diameter of the guide post is not less than the groove width of the guide groove, and the guide post is elastic.

[0008] As a preferred technical solution for variable aperture, the guide post is cylindrical or annular.

[0009] As a preferred technical solution for variable aperture, the guide post includes a plurality of first elastic ribs, which are arranged in a circle, and any two adjacent first elastic ribs are spaced apart, with each first elastic rib passing through the guide groove.

[0010] As a preferred technical solution for variable aperture, the first elastic rib is arc-shaped and has an inner sidewall and an outer sidewall. Along the width direction of the guide groove, the guide groove has a first groove wall and a second groove wall spaced apart.

[0011] The first groove wall abuts against and is tangentially engaged with the outer wall of one of the first elastic ribs, and the second groove wall abuts against and is tangentially engaged with the outer wall of the other of the first elastic ribs.

[0012] As a preferred technical solution for variable aperture, the first elastic rib is made of plastic material.

[0013] As a preferred technical solution for the variable aperture, the blade and the rotating component are rotatably connected by a rotating shaft. The blade is also provided with a second deformation groove, which is located on the side of the guide groove away from the rotating shaft, or the second deformation groove is located on the side of the guide groove closer to the rotating shaft.

[0014] A second elastic rib is formed between the second deformation groove and the guide groove.

[0015] As a preferred technical solution for the variable aperture, the blade is further provided with a third deformation groove, wherein the second deformation groove is located on the side of the guide groove closer to the rotating shaft, and the third deformation groove is located on the side of the guide groove away from the rotating shaft;

[0016] Each of the third deformation grooves forms a third elastic rib with the guide groove.

[0017] As a preferred technical solution for the variable aperture, the width of the second elastic rib is equal to the width of the third elastic rib.

[0018] As a preferred technical solution for variable aperture, the third deformation groove and the guide groove are both arc-shaped, the second deformation groove is arc-shaped or circular, and the centers of the guide groove, the second deformation groove and the third deformation groove coincide.

[0019] The variable aperture provided in this application has at least the following beneficial effects:

[0020] In this variable aperture, one of the blades and the housing is provided with a guide groove, and the other is connected to a guide post. The guide post is inserted into the guide groove, and the outer diameter of the guide post is not less than the width of the guide groove. The guide post is elastic, and the guide post and the guide groove are interference-fitted. The guide post undergoes elastic deformation to adapt to the width of the guide groove, allowing the guide post to slide along the guide groove. Since there is no gap between the guide post and the guide groove, when the aperture diameter needs to be adjusted to a specified size, the amount of travel of the guide post sliding along the guide groove is controllable, thereby making the amount of travel of the blade relative to the housing controllable. Furthermore, compared with the prior art, by making the guide post elastic, when the guide post slides along the guide groove, the amount of elastic deformation of the guide post at various positions in the length direction of the guide groove can remain stable and consistent, significantly improving the control accuracy of the aperture diameter dimensions.

[0021] On the other hand, this application provides a camera module, including an optical lens, a motor, and a variable aperture as described in any of the above solutions. The variable aperture is disposed on the light-incident side of the optical lens, and the relative position of the variable aperture and the optical lens is fixed. The motor is connected to the optical lens for transmission, and the motor is used to drive the optical lens to move along the center line direction of the optical lens.

[0022] The camera module provided in this application has at least the following beneficial effects:

[0023] The camera module uses the aforementioned adjustable aperture, and the aperture hole has high control precision, thus ensuring the shooting effect of the camera module. Simple Explanation of the Diagram

[0024] Figure 1 is a schematic diagram of the variable aperture in an embodiment of this application; Figure 2 is a schematic diagram of the first partial structure of the variable aperture in an embodiment of this application; Figure 3 is an exploded view of the variable aperture in an embodiment of this application; Figure 4 is a schematic diagram of the first structure of the base in the variable aperture in an embodiment of this application; Figure 5 is a schematic diagram of the second partial structure of the variable aperture in an embodiment of this application; Figure 6 is a schematic diagram of the second structure of the base in the variable aperture in an embodiment of this application; Figure 7 is an enlarged view of point A in Figure 6; Figure 8 is a schematic diagram of the third partial structure of the variable aperture in an embodiment of this application; Figure 9 is a schematic diagram of the third structure of the base in the variable aperture in an embodiment of this application; Figure 10 is an enlarged view of point B in Figure 9; Figure 11 is a schematic diagram of the first structure of the blades in the variable aperture in an embodiment of this application; Figure 12 is a schematic diagram of the second structure of the blades in the variable aperture in an embodiment of this application; Figure 13 is a schematic diagram of the third structure of the blades in the variable aperture in an embodiment of this application. Implementation

[0025] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Specifically, the terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0028] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0029] As shown in Figures 1 to 3, this embodiment provides a variable aperture, which includes a housing 1, a rotating component 2, a driving component 3, and multiple blades 4. The rotating component 2 is rotatably connected to the housing 1, the driving component 3 is fixedly installed on the housing 1, each blade 4 is rotatably connected to the rotating component 2, and each blade 4 is slidably connected to the housing 1. The multiple blades 4 form an adjustable aperture 5. Specifically, when the driving component 3 drives the rotating component 2 to rotate relative to the housing 1, the rotating component 2 simultaneously drives the multiple blades 4 to slide relative to the housing 1, and the blades 4 simultaneously rotate relative to the rotating component 2, thereby adjusting the position of the blades 4 relative to the housing 1 and thus adjusting the aperture 5.

[0030] Referring to Figures 1 and 3, in this embodiment, the housing 1 includes a base 11 and a cover 12. The cover 12 covers the base 11, and the cover 12 and the base 11 form a receiving cavity 13. The rotating component 2, the driving component 3, and multiple blades 4 are all located within the receiving cavity 13, thereby protecting the various components in the receiving cavity 13 through the cover 12. The cover 12 is provided with a first light-transmitting hole 121, and the base 11 is provided with a second light-transmitting hole 111. The first light-transmitting hole 121 and the second light-transmitting hole 111 are respectively located on both sides of the aperture hole 5, and both the first light-transmitting hole 121 and the second light-transmitting hole 111 are opposite to the aperture hole 5. The aperture diameter of the first light-transmitting hole 121 and the aperture diameter of the second light-transmitting hole 111 are not less than the maximum aperture diameter of the aperture hole 5.

[0031] Referring to Figure 3, in this embodiment, the rotating component 2 is a rotor, and the driving component 3 includes a coil 31 fixedly mounted on the base 11, a first magnet 32 ​​fixedly mounted on the rotating component 2, and a second magnet 33 fixedly mounted on the rotating component 2. When the coil 31 is energized, it, in conjunction with the first magnet 32 ​​and the second magnet 33, generates a tangential force along the circumference of the rotating component 2. Under the action of this tangential force, the rotating component 2 can be driven to rotate relative to the housing 1. In other embodiments, the driving component 3 can also be replaced by an electric motor, etc.

[0032] It should be noted that the variable aperture may include one or more driving elements 3, and the specific number of driving elements 3 can be selected according to actual needs. This embodiment exemplarily provides a scheme where the variable aperture includes two driving elements 3. In other embodiments, the number of driving elements 3 may also be one, three, or more.

[0033] Optionally, referring to Figure 3, in this embodiment, the base 11 is provided with an annular boss 112, and the rotating member 2 is sleeved on the annular boss 112 and can rotate relative to the annular boss 112. This arrangement can improve the stability of the rotation of the rotating member 2. The base 11 and the annular boss 112 can be integrally formed, or they can be separately formed and connected by connectors, or connected by welding or other processes.

[0034] Optionally, referring to Figure 3, in this embodiment, the variable aperture also includes multiple balls 6. The balls 6 are disposed between the rotating component 2 and the base 11, and are evenly distributed along the circumference of the rotating component 2. Each ball 6 simultaneously rolls with both the rotating component 2 and the base 11, thus improving the smoothness of the rotation of the rotating component 2 relative to the housing 1. Preferably, the base 11 is provided with a rolling groove 114, in which part of the balls 6 are located, and the position of the balls 6 is restricted by the rolling groove 114. The specific number of balls 6 can be set according to actual needs. This embodiment exemplarily provides a scheme with four balls 6.

[0035] Optionally, referring to Figure 3, in this embodiment, the base 11 is also provided with a first mounting groove 113, and the coil 31 is embedded in the first mounting groove 113, so as to ensure that the coil 31 is stably mounted on the base 11.

[0036] Optionally, referring to Figure 3, in this embodiment, the rotating member 2 is provided with a second mounting groove 21 for each first magnet 32, and the first magnet 32 ​​is embedded in the corresponding second mounting groove 21. The rotating member 2 is provided with a third mounting groove 22 for each second magnet 33, and the second magnet 33 is embedded in the corresponding third mounting groove 22. This ensures that the first magnet 32 ​​and the second magnet 33 are stably mounted on the rotating member 2.

[0037] Optionally, referring to Figure 2, one of the blade 4 and the housing 1 is provided with a guide groove 41, and the other is connected with a guide post 8. The guide post 8 is inserted into the guide groove 41, and the outer diameter of the guide post 8 is not less than the groove width of the guide groove 41. The guide post 8 is elastic. With this configuration, the guide post 8 and the guide groove 41 are interference-fitted, and the guide post 8 undergoes elastic deformation to adapt to the groove width of the guide groove 41, allowing the guide post 8 to slide along the guide groove 41. Since there is no gap between the guide post 8 and the guide groove 41, when the aperture of the aperture 5 needs to be adjusted to a specified size, the stroke of the guide post 8 sliding along the guide groove 41 is controllable, thereby making the stroke of the blade 4 relative to the housing 1 controllable. Furthermore, compared with the prior art, by making the guide post 8 elastic, when the guide post 8 slides along the guide groove 41, the amount of elastic deformation of the guide post 8 at various positions in the length direction of the guide groove 41 can remain stable and consistent, significantly improving the control accuracy of the aperture size of the aperture 5.

[0038] Specifically, in this embodiment, a guide groove 41 is provided on the blade 4, and a guide post 8 is connected to the base 11. The guide post 8 can be integrally formed with the base 11 or it can be a separate component. In other embodiments, a guide groove 41 can also be provided on the base 11, and a guide post 8 can be connected to the blade 4.

[0039] Specifically, in this embodiment, the outer diameter of the guide post 8 is larger than the width of the guide groove 41. Specifically, in this embodiment, the width of the guide groove 41 is 0.155 mm; and the outer diameter of the guide post 8 is 0.160 mm. In other embodiments, the opening of the guide groove 41 and the outer diameter of the guide post 8 can be set according to actual needs, and the outer diameter of the guide post 8 can also be set to be equal to the width of the guide groove 41.

[0040] Optionally, referring to Figure 4, the guide post 8 is cylindrical. In this case, the guide post 8 itself is elastic, and the guide post 8 can be made of elastic materials, such as urethane or rubber.

[0041] As an alternative, referring to Figures 5 to 7, the guide post 8 can also be annular. That is, the guide post 8 has an elastic groove 81 at its center, and the guide post 8 has a thin-walled structure. When the guide post 8 is subjected to compressive force in its radial direction, the guide post 8 can undergo elastic deformation and compress the elastic groove 81; and / or, the guide post 8 itself is made of elastic material, and when the guide post 8 is subjected to compressive force in its radial direction, the guide post 8 itself can undergo elastic deformation. Preferably, in this embodiment, along the groove depth direction of the elastic groove 81, the groove opening end and the groove bottom end of the elastic groove 81 are respectively located on both sides of the guide groove 41, so as to ensure that the guide post 8 can undergo normal elastic deformation when subjected to the radial force given by the groove wall of the guide groove 41, so as to adapt to the groove width of the guide groove 41. It should be noted that the depth of the elastic groove 81 can be set according to actual needs. In this embodiment, an example is given that the depth of the elastic groove 81 is 0.335mm and the height of the guide post 8 is 0.390mm. The wall thickness of the guide post 8 can also be set according to actual needs. In this embodiment, an example is given that the depth of the elastic groove 81 is 0.06mm.

[0042] As an alternative, referring to Figures 8 to 10, the guide post 8 includes a plurality of first elastic ribs 82 arranged in a circle, with any two adjacent first elastic ribs 82 spaced apart. Each first elastic rib 82 passes through the guide groove 41. This arrangement results in the first elastic ribs 82 having a slender structure, which elastically deforms when subjected to the compressive force from the groove wall of the guide groove 41, adapting to the width of the guide groove 41 and not affecting the sliding of the guide post 8 along the guide groove 41. It should be noted that the specific number of first elastic ribs 82 included in the guide post 8 can be set according to actual needs. In this embodiment, an example of a guide post 8 including four first elastic ribs 82 is provided. Preferably, the guide post 8 is made of plastic material, such as PC or ABS. In this case, the first elastic ribs 82 are relatively rigid and elastically bend inward when subjected to the compressive force from the groove wall of the guide groove 41. More preferably, the first elastic rib 82 is arc-shaped and has an inner sidewall 821 and an outer sidewall 822. Along the width direction of the guide groove 41, the guide groove 41 has a first groove wall 411 and a second groove wall 412 spaced apart. The first groove wall 411 abuts against and is tangentially engaged with the outer sidewall 822 of one of the first elastic ribs 82, and the second groove wall 412 abuts against and is tangentially engaged with the outer sidewall 822 of the other first elastic rib 82. This arrangement can prevent the gap between the two first elastic ribs 82 from being opposite to the first groove wall 411 or the second groove wall 412, thereby ensuring that the guide post 8 can slide smoothly along the guide groove 41. The two first elastic ribs 82 that cooperate with the first groove wall 411 or the second groove wall 412 deform simultaneously to ensure that the stroke of the guide post 8 when sliding along the guide groove 41 is controllable, thereby ensuring the control accuracy of the aperture hole 5.

[0043] Optionally, referring to Figure 11, the blade 4 may only have a guide groove 41, and the blade 4 may be made of an elastic material such as rubber or urethane, allowing it to undergo a certain degree of elastic deformation under external force. With this configuration, both the guide post 8 and the blade 4 are elastic, and their combined effect reduces the elastic deformation of the guide post 8, thus extending its service life. It should be noted that the elastic coefficient of the blade 4 and the guide post 8 can be equal, or the elastic coefficient of the blade 4 can be slightly smaller than that of the guide post 8, and both the guide post 8 and the blade 4 can undergo elastic deformation, ensuring that the deformation is mainly concentrated on the guide post 8, thereby guaranteeing the accuracy of aperture control for the aperture 5.

[0044] As an alternative, referring to Figure 12, the blade 4 and the rotating component 2 are rotatably connected via a rotating shaft 7. The blade 4 also has a second deformation groove 42, located on the side of the guide groove 41 away from the rotating shaft 7, or on the side of the guide groove 41 closer to the rotating shaft 7. A second elastic rib 44 is formed between the second deformation groove 42 and the guide groove 41. The second elastic rib 44 is a slender structure with its own elasticity, and can undergo a certain amount of elastic deformation under the compression of the guide post 8. Through the interaction of the guide post 8 and the second elastic rib 44, both undergo elastic deformation simultaneously, reducing the elastic deformation of the guide post 8 and extending its service life. It should be noted that the elastic coefficient of the second elastic rib 44 can be slightly smaller than that of the guide post 8, so that the deformation is mainly concentrated on the guide post 8, ensuring the accuracy of aperture control for the aperture 5. Specifically, in this embodiment, an exemplary arrangement is provided in which the second deformation groove 42 is located on the side of the guide groove 41 close to the rotating shaft 7. In other embodiments, the second deformation groove 42 may also be located on the side of the guide groove 41 away from the rotating shaft 7.

[0045] Optionally, referring to Figure 13, the blade 4 is also provided with a third deformation groove 43. The second deformation groove 42 is located on the side of the guide groove 41 closer to the rotating shaft 7, and the third deformation groove 43 is located on the side of the guide groove 41 away from the rotating shaft 7. The third deformation groove 43 and the guide groove 41 form a third elastic rib 45. The third elastic rib 45 is also a slender structure and has its own elasticity. Under the compression of the guide post 8, it can also undergo a certain elastic deformation. Thus, through the cooperation of the guide post 8, the second elastic rib 44 and the third elastic rib 45, the three elastic deformations occur simultaneously, which can further reduce the elastic deformation of the guide post 8, thereby extending the service life of the guide post 8. Furthermore, through the simultaneous elastic deformation of the second elastic rib 44 and the third elastic rib 45, the deformation amplitude on both sides of the guide groove 41 can be made more consistent, ensuring that the stroke of the guide post 8 relative to the guide groove 41 is controllable during the adjustment of the aperture 5, thereby ensuring the accuracy of aperture control of the aperture 5.

[0046] Optionally, referring to Figure 13, the width of the second elastic rib 44 is equal to the width of the third elastic rib 45. This arrangement ensures that the elastic coefficient of the third elastic rib 45 is equal to that of the second elastic rib 44, so that the deformation is mainly concentrated on the guide post 8, thus guaranteeing the accuracy of aperture control for the aperture 5.

[0047] Optionally, the third deformation groove 43 and the guide groove 41 are both arc-shaped, and the second deformation groove 42 is arc-shaped or circular, with the centers of the guide groove 41, the second deformation groove 42, and the third deformation groove 43 coinciding. This arrangement ensures that the deformation amplitude on both sides of the guide groove 41 is consistent along its extension direction, and improves the smoothness of the sliding of the guide post 8 relative to the guide groove 41.

[0048] Furthermore, the guide groove 41, the second deformation groove 42, and the third deformation groove 43 cooperate with the guide post 8 to satisfy the movement trajectory of the blade 4. Therefore, the shape of the guide groove 41, the second deformation groove 42, and the third deformation groove 43 is not limited to arc shape or circle. Even if the guide groove 41, the second deformation groove 42, and the third deformation groove 43 are all arc shape or circle, their centers can coincide with two of them, or they can not coincide with any of them.

[0049] This embodiment also provides a camera module, including an optical lens, a motor, and the aforementioned variable aperture. The variable aperture is disposed on the light-incident side of the optical lens, and the relative position of the variable aperture and the optical lens is fixed. The motor is connected to the optical lens for transmission, and the motor is used to drive the optical lens to move along the center line direction of the optical lens.

[0050] Obviously, the above embodiments of this application are merely examples for clear illustration and are not intended to limit the implementation of this application. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of the patent application.

[0051] 1: Shell 2: Rotating component 3: Drive components 4: Leaf blade 5: Aperture Hole 6: Ball bearing 7: Shaft 8: Guide column 11: Base 12: Cover 13: Receiving cavity 21: Second mounting slot 22: Third mounting slot 31: Coil 32: First magnet 33: Second magnet 41: Guide groove 42: Second deformation groove 43: Third Deformation Groove 44: Second elastic rib 45: Third elastic rib 81: Elastic groove 82: First elastic rib 111: Second light-transmitting hole 112: Annular boss 113: First mounting slot 114: Scroll groove 121: First light-transmitting hole 411: First tank wall 412: Second tank wall 821: Inner wall 822: Lateral wall

Claims

1. A variable aperture, comprising a housing, a rotating component rotatably connected to the housing, a driving component fixedly connected to the housing, and a plurality of blades, each blade being rotatably connected to the rotating component and slidably connected to the housing, the plurality of blades forming an aperture with an adjustable diameter; wherein, One of the blade and the shell is provided with a guide groove, and the other of the blade is connected to a guide post. The guide post includes a plurality of first elastic ribs, which are arranged in a circle and any two adjacent first elastic ribs are spaced apart. Each first elastic rib passes through the guide groove, and the outer diameter of the guide post is not less than the width of the guide groove.

2. The variable aperture according to claim 1, wherein, The guide post is cylindrical, or the guide post is annular.

3. The variable aperture according to claim 1, wherein, The first elastic rib is arc-shaped and has an inner sidewall and an outer sidewall. Along the width direction of the guide groove, the guide groove has a first groove wall and a second groove wall spaced apart. The first groove wall abuts against and is tangentially engaged with the outer sidewall of one of the first elastic ribs, and the second groove wall abuts against and is tangentially engaged with the outer sidewall of the other first elastic rib.

4. The variable aperture according to claim 1, wherein, The first elastic rib is made of plastic.

5. The variable aperture according to any one of claims 1 to 4, wherein, The blade and the rotating component are rotatably connected by a rotating shaft. The blade is also provided with a second deformation groove, which is located on the side of the guide groove away from the rotating shaft, or the second deformation groove is located on the side of the guide groove close to the rotating shaft. A second elastic rib is formed between the second deformation groove and the guide groove.

6. The variable aperture according to claim 5, wherein, The blade is also provided with a third deformation groove, the second deformation groove is located on the side of the guide groove closer to the rotating shaft, and the third deformation groove is located on the side of the guide groove away from the rotating shaft; the third deformation groove and the guide groove form a third elastic rib.

7. The variable aperture according to claim 6, wherein, The width of the second elastic rib is equal to the width of the third elastic rib.

8. The variable aperture according to claim 6, wherein, The third deformation groove and the guide groove are both arc-shaped, the second deformation groove is arc-shaped or circular, and the centers of the guide groove, the second deformation groove and the third deformation groove coincide.

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