A variable aperture and its driving mechanism and a lens having the variable aperture

Abstract

This invention discloses a variable aperture driving mechanism, including a magnetic component one and a magnetic component two. The planes along the movement paths of magnetic components one and two are parallel, and when the actuator is in any aperture setting, at least one pair of magnetic components one and two have an offset in the direction of movement; or when magnetic component two is in an attracted state with one of multiple magnetic components one, magnetic component two has an offset in the direction of movement from the other magnetic components one. This variable aperture driving mechanism reduces space occupation, which is beneficial for reducing the overall volume of the variable aperture to meet the installation requirements of the lens barrel. Furthermore, it has a lower cost compared to traditional motor-driven mechanisms. This invention also discloses a variable aperture and lens with this driving mechanism, which also possesses the above-mentioned technical effects.

Description

Technical Field

[0001] The present invention relates to the technical field of projection equipment, and more specifically, to a variable aperture and a driving mechanism thereof, and also to a lens. Background Art

[0002] With the development of the projection industry, the projection environment used by users is becoming more and more complex, which requires that the color and brightness of the projection equipment be different in different usage scenarios. For example, when projecting in the living room during the day, the ambient brightness is relatively bright, so the projection equipment is required to be in a high-brightness state to make the projected image clearer; but when the projection is used to play the image at night, if the projection brightness is too high, the color of the image will be bright, which will reduce the contrast and greatly reduce the viewing experience. At this time, it is necessary to reduce the luminous flux, reduce the brightness, and improve the image contrast.

[0003] At present, the methods to solve the light intensity of projection equipment include reducing the current of LED lamps or using apertures to block the light. Among them, reducing the current will not improve the contrast of the picture in actual use, while using an aperture is a better method.

[0004] Common variable apertures are driven by motors, levers, and other structures. For example, a motor is used to drive multiple aperture blades to form a knife-type aperture. However, the motor is large in size, so the overall structure is large and difficult to fit inside the lens barrel.

[0005] In summary, how to effectively solve the problem of the large size of the motor-driven variable aperture is a problem that those skilled in the art need to solve. Summary of the invention

[0006] In view of this, the first object of the present invention is to provide a variable aperture driving mechanism, the structural design of which can effectively solve the problem of the large volume of the motor-driven variable aperture. The second object of the present invention is to provide a variable aperture and lens lens including the above-mentioned driving mechanism.

[0007] In order to achieve the above first object, the present invention provides the following technical solutions:

[0008] A variable aperture drive mechanism includes a magnetic component 1 and a magnetic component 2, wherein the magnetic component 1 corresponds to the magnetic component 2 one by one and is provided in N pairs, at least one of each pair of the magnetic component 1 and the magnetic component 2 is an electromagnet, each of the magnetic components 1 is fixedly installed, each of the magnetic components 2 is respectively connected to an actuating component having a degree of freedom of movement relative to the magnetic component 1, the planes where the movement paths of the magnetic components 1 and the magnetic components 2 are located are parallel, and when the actuating component is in any aperture gear position, at least one pair of the magnetic components 1 and the magnetic components 2 has an offset in the movement direction, wherein N is a positive integer not less than 2.

[0009] Preferably, in the above variable aperture driving mechanism, when the actuating member is in any aperture gear position, at least two pairs of the magnetic members 1 and 2 have offsets in the movement direction and the offsets are different.

[0010] Preferably, in the above-mentioned variable aperture driving mechanism, when the actuating member is in any aperture gear position, one pair of the magnetic member 1 and the magnetic member 2 is in an attracted state, and the remaining pairs of the magnetic member 1 and the magnetic member 2 have an offset in the movement direction.

[0011] Preferably, in the above variable aperture driving mechanism, the magnetic pole directions of the magnetic component 1 and the magnetic component 2 are perpendicular to the movement direction.

[0012] Preferably, in the above variable aperture driving mechanism, the magnetic member 1 and the magnetic member 2 are respectively arranged at intervals along the moving direction.

[0013] Preferably, in the above variable aperture driving mechanism, there is a gap between the first magnetic member and the second magnetic member in the direction of the acting force therebetween.

[0014] A variable aperture drive mechanism comprises N magnetic parts one and one magnetic part two, wherein the magnetic part one is an electromagnet, the magnetic parts two or all of the magnetic parts one are fixedly mounted, and the other is connected to an actuating part, the actuating part has freedom of movement relative to the fixedly mounted magnetic part one or the magnetic part two, the plane where the movement paths of the magnetic parts one and two are located is parallel, and when the actuating part is in any aperture gear position, there is an offset in the movement direction between the magnetic part two and at least one of the magnetic parts one, wherein N is a positive integer not less than 2.

[0015] Preferably, in the above variable aperture driving mechanism, the magnetic pole directions of the magnetic component 1 and the magnetic component 2 are perpendicular to the movement direction.

[0016] Preferably, in the above variable aperture driving mechanism, there is a gap between the first magnetic member and the second magnetic member in the direction of the acting force therebetween.

[0017] The drive mechanism of the variable aperture provided by the present invention adopts a mode of matching magnetic member 1 with magnetic member 2, and the planes where the motion paths of magnetic member 1 and magnetic member 2 are located are parallel. In one mode, magnetic member 1 and magnetic member 2 correspond to each other and are provided in N pairs, at least one of each pair of magnetic member 1 and magnetic member 2 is an electromagnet, and when the actuator is in any aperture gear position, at least one pair of magnetic member 1 and magnetic member 2 has an offset in the motion direction; in another mode, it includes N magnetic members 1 and one magnetic member 2, magnetic member 1 is an electromagnet, and when magnetic member 2 and one magnetic member 1 of a plurality of magnetic members are in an attracted state, there is an offset in the motion direction between magnetic member 2 and other magnetic member 1. The mode of matching magnetic member 1 with magnetic member 2 uses electromagnetic attraction or repulsion to manipulate the mechanical device to achieve aperture size change adjustment. And because magnetic member 1 and magnetic member 2 can provide reliable force through a smaller size, the space occupation is reduced, which is conducive to reducing the overall volume of the variable aperture to meet the installation requirements of the lens barrel. And the cost is lower than that of traditional motor drive. In addition, the electromagnetic drive has high control accuracy, so the aperture diameter formed has high accuracy. Furthermore, through the coordination of the positions of multiple sets of magnetic parts 1 and 2, various changes in the aperture diameter can be achieved to provide a better user experience.

[0018] The present invention also provides a variable aperture, which includes any one of the above-mentioned driving mechanisms. Since the above-mentioned driving mechanism has the above-mentioned technical effects, the variable aperture having the driving mechanism should also have corresponding technical effects.

[0019] The present invention also provides the following technical solutions:

[0020] A variable aperture, comprising X magnetic members 1, Y magnetic members 2, an aperture housing and a blade assembly, wherein X magnetic members 1 are arranged in the aperture housing, Y magnetic members 2 are arranged in the blade assembly, a gap is provided between the magnetic member 1 and the magnetic member 2 in the direction of the acting force of the two, X is a positive integer not less than 2, and Y is a positive integer not less than 1;

[0021] The magnetic member 1 is an electromagnet. When one of the magnetic members 1 and the corresponding magnetic member 2 is in an attracted state, there is an offset in the movement direction between the other magnetic members 1 and the corresponding magnetic member 2.

[0022] Preferably, in the above variable aperture, a printed circuit board is fixed on the aperture housing, and the printed circuit board is electrically connected to each of the electromagnets and outputs forward and / or reverse current to the electromagnet to control the magnetic pole direction of the electromagnet, or to control the on and off of the electromagnet.

[0023] Preferably, in the above-mentioned variable aperture, the blade assembly includes a turntable bracket and a plurality of blades, the turntable bracket is rotatably mounted on the aperture housing, each of the blades is rotatably connected to the aperture housing respectively, and when the turntable bracket rotates relative to the aperture housing, each of the blades is driven to rotate to adjust the size of the aperture formed by the blades, and the second magnetic component is fixed on the turntable bracket.

[0024] Preferably, in the above variable aperture, the aperture body is provided with a plurality of protrusions, and the disk surface of the turntable bracket rests on the protrusions; or the turntable bracket has a plurality of protrusions, and the turntable bracket rests on the aperture body through the protrusions.

[0025] Preferably, in the above variable aperture, the aperture body has a positioning protrusion perpendicular to the axial direction of the aperture hole, the turntable bracket has a limiting guide groove matched with the positioning protrusion, and one side of the limiting guide groove has an avoidance groove, the positioning protrusion is inserted into the avoidance groove and rotated until it abuts against the concave table surface of the limiting guide groove;

[0026] Alternatively, the turntable bracket has a positioning protrusion perpendicular to the axial direction of the aperture hole, the aperture body has a limiting guide groove matching the positioning protrusion, and one side of the limiting guide groove has an avoidance groove, the positioning protrusion is inserted into the avoidance groove and rotated until it abuts against the concave table surface of the limiting guide groove.

[0027] In order to achieve the second objective, the present invention further provides a lens system, which includes any of the above variable apertures. Since the above variable aperture has the above technical effects, the lens system with the variable aperture should also have corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 is a schematic diagram of a driving mechanism of a variable aperture according to a first embodiment of the present invention;

[0030] Figure 2 is a schematic diagram of a driving mechanism of a variable aperture according to a second embodiment of the present invention;

[0031] Figure 3 A schematic diagram of an arrangement method corresponding to the magnetic component 1 and the magnetic component 2;

[0032] Figure 4 A schematic diagram of another arrangement method corresponding to the magnetic member 1 and the magnetic member 2;

[0033] Figure 5 It is a schematic diagram of the exploded structure of a variable aperture according to a specific embodiment of the present invention;

[0034] Figure 6 This is a schematic diagram of the fully open aperture state;

[0035] Figure 7 for Figure 6 Schematic diagram of the corresponding permanent magnet and electromagnet positions;

[0036] Figure 8 This is a schematic diagram of the intermediate state of the aperture;

[0037] Fig. 9 for Figure 8 Schematic diagram of the corresponding permanent magnet and electromagnet positions;

[0038] Fig.10 This is a schematic diagram of the minimum aperture state;

[0039] Fig.11 for Fig.10 Schematic diagram of the corresponding permanent magnet and electromagnet positions;

[0040] Fig.12 It is a schematic diagram of blade movement;

[0041] Fig.13 It is a cross-sectional diagram of the cooperation between permanent magnet and electromagnet.

[0042] The following are marked in the accompanying drawings:

[0043] Magnetic component one 10, magnetic component two 20; cover plate 1, blade 2, permanent magnet 3, turntable bracket 4, electromagnet 5, aperture body 6, printed circuit board 7, arc-shaped slide groove 21, positioning hole 22, fixed axis 61, accommodating cavity 62, positioning protrusion 63, convex point 64, guide axis 41, arc-shaped avoidance groove 42, limiting guide groove 43, avoidance groove 44. DETAILED DESCRIPTION

[0044] The embodiment of the invention discloses a variable aperture and a driving mechanism thereof and a lens barrel, so as to reduce the volume thereof and better adapt to the lens barrel.

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] In the first implementation, see Figure 1 The variable aperture driving mechanism provided by the present invention includes a magnetic member 10 and a magnetic member 20, wherein the magnetic member 10 and the magnetic member 2 20 correspond to each other one by one and are provided in N pairs, wherein N is a positive integer not less than 2.

[0047] At least one of each pair of magnetic parts 10 and 20 is an electromagnet, including magnetic part 10 being an electromagnet and magnetic part 20 being a permanent magnet or iron sheet or other magnetic material that can be magnetically adsorbed, or magnetic part 10 being a permanent magnet or iron sheet or other magnetic material that can be magnetically adsorbed, magnetic part 20 being an electromagnet, or both magnetic part 10 and magnetic part 20 being electromagnets. An electromagnet is a device that generates electromagnetism when electricity is supplied. A conductive winding that matches its power is wound around the outside of an iron core. This coil with current flowing through it has magnetism like a magnet, and it is also called an electromagnet. The calculation formula for the actual electromagnetic force is as follows:

[0048]

[0049] Where F is the electromagnetic force (J / cm); B is the magnetic induction intensity (Wb / cm 2 ); S is the total surface area of ​​the magnetic pole (cm 2 ); μ 0 is the air magnetic permeability coefficient, which is 1.25e-8H / cm.

[0050] Each magnetic member 20 is connected to an actuator having a degree of freedom of movement relative to the magnetic member 10. The magnetic member 10 is specifically fixedly mounted on a stationary part of the aperture housing. The magnetic member 20 is connected to the actuator. The actuator has a degree of freedom of movement relative to the magnetic member 10, and the size of the aperture is changed by the movement of the actuator. The structure of the specific actuator and the method for adjusting the aperture size are not specifically limited here, and reference may be made to conventional settings in the prior art.

[0051] The planes where the movement paths of the magnetic component 10 and the magnetic component 2 20 are located are parallel, that is, the magnetic component 10 is not on the movement path of the magnetic component 2 20 , but is staggered with the movement path of the magnetic component 2 20 .

[0052] When the actuator is in any aperture gear position, at least one pair of magnetic members 10 and 20 has an offset in the direction of motion. Since at least one pair of magnetic members 10 and 20 has an offset in the direction of motion, the magnetic force of the non-facing magnetic members 10 and 20 can form a component force in the direction of motion, thereby forming a force to drive the actuator to move. By controlling the on and off of the electromagnet or changing the current direction of the electromagnet, the switching of the attraction state of different pairs of magnetic members 10 and 20 can be achieved, thereby adjusting the aperture size.

[0053] The drive mechanism of the variable aperture provided by the present invention is applied, and the magnetic member 10 cooperates with the magnetic member 2 20, and the electromagnetic attraction or repulsion is used to manipulate the mechanical device to achieve the aperture size change adjustment. And because the magnetic member 10 and the magnetic member 2 20 can provide reliable force through a smaller size, the space occupation is reduced, which is conducive to the reduction of the overall volume of the variable aperture to meet the installation requirements of the lens barrel. And the cost is lower than that of the traditional motor drive. In addition, the electromagnetic drive has high control accuracy, and the aperture caliber formed has high accuracy. Furthermore, by coordinating the setting positions of multiple groups of magnetic members 10 and magnetic members 2 20, various changes in the aperture caliber can be achieved to provide a better user experience.

[0054] Furthermore, when the actuator is in any aperture gear position, at least two pairs of magnetic members 10 and magnetic members 2 20 have an offset in the direction of movement and the offsets are different. When the actuator is in any aperture gear position, at least two pairs of magnetic members 10 and magnetic members 2 20 have different corresponding offsets, which can drive the actuator to move to different apertures corresponding to the light source. Specifically, when the actuator is in any aperture gear position, the offsets corresponding to each pair of magnetic members 10 and magnetic members 2 20 are different. Then, in the attracted state, each pair of magnetic members 10 and magnetic members 2 20 can correspond to different sizes of apertures, and the difference in offsets also facilitates providing a force to drive the actuator to move in different attracted states.

[0055] Furthermore, when the actuator is in any aperture gear position, one pair of magnetic member 10 and magnetic member 2 20 is in an attracted state, and the other pairs of magnetic member 10 and magnetic member 2 20 have an offset in the direction of movement. That is, corresponding to each gear of the aperture, there is a pair of magnetic member 10 and magnetic member 2 20 in an attracted state, thereby ensuring the reliability of different gears of the aperture. According to needs, it is also possible to set one of the gears of the aperture not to correspond to the attraction of magnetic member 10 and magnetic member 2 20. For example, if three pairs of magnetic member 10 and magnetic member 2 20 are provided, each pair of magnetic member 10 and magnetic member 2 20 in an attracted state corresponds to a gear of the aperture, and when one pair of magnetic member 10 and magnetic member 2 20 are in an attracted state, the offsets between the other two pairs of magnetic member 10 and magnetic member 2 20 are different. In addition, another aperture gear is achieved by the gravity of the actuator, an additional elastic member, or the magnetic repulsion between all the magnetic members 10 and 20, which together with the three gears corresponding to the respectively attracted states of the three pairs of magnetic members 10 and 20 form four aperture sizes.

[0056] Specifically, the magnetic member 10 and the magnetic member 20 are arranged at intervals along the direction of movement. That is, the arrangement direction of the magnetic member 10 and the magnetic member 20 is along the direction of movement, which can make good use of space and reduce space occupation, which is conducive to reducing the overall volume of the variable aperture to meet the installation requirements of the lens barrel. The movement mode of the actuator can be linear motion or rotation. When the actuator moves linearly, such as Figure 3 As shown, the arrangement direction of the magnetic member 10 and the magnetic member 2 20 can be along the linear motion direction of the actuator. When the actuator rotates, the arrangement direction of the magnetic member 10 and the magnetic member 2 20 can be along the rotational motion direction of the actuator, that is, arranged in the circumferential direction.

[0057] As required, the arrangement direction of the magnetic member 10 and the magnetic member 20 may also be at a certain angle to the movement direction, and driving can also be achieved. Figure 4 As shown, the arrangement direction of the magnetic member 10 is perpendicular to the movement direction. In the figure, the actuating member performs a rotational motion, and the arrangement direction of the magnetic member 10 is along the radial direction of the rotation of the actuating member.

[0058] Furthermore, there is a preset spacing between adjacent magnetic members 10. The specific preset spacing is set according to the size of the attraction force of magnetic member 10 and magnetic member 2 20, that is, the size of magnetic member 10 and magnetic member 2 20, to prevent false attraction caused by too small spacing.

[0059] It should be noted that the magnetic component 10 and the magnetic component 2 20 may specifically include one magnetic field component respectively, or may include multiple magnetic field components respectively, and the multiple magnetic field components form a group to provide forces in the same direction.

[0060] In a second embodiment, the variable aperture driving mechanism provided by the present invention includes N magnetic parts 10 and one magnetic part 20, the magnetic part 10 is an electromagnet, the magnetic part 20 or all the magnetic parts 10 are fixedly installed, and the other is connected to an actuator, the actuator is connected to an actuator with freedom of movement relative to the fixedly installed magnetic part 10 or the magnetic part 20, the magnetic part 10 is parallel to the plane where the movement path of the magnetic part 20 is located, and when the actuator is in any aperture gear, there is an offset in the movement direction between the magnetic part 20 and at least one magnetic part 10, wherein N is a positive integer not less than 2.

[0061] The difference between this embodiment and the first embodiment is that the magnetic member 10 and the magnetic member 2 20 are not arranged in pairs in a one-to-one correspondence, but one magnetic member 2 20 corresponds to multiple magnetic members 10, that is, a one-to-many arrangement. The magnetic member 10 is set as an electromagnet, and the magnetic member 2 20 can be an electromagnet, or a permanent magnet or iron sheet or other material that can be magnetically adsorbed. In addition, in this embodiment, the magnetic member 2 20 or all the magnetic members 10 are connected to the actuator.

[0062] like Figure 2 As shown, when the actuator is in any aperture gear, there is an offset in the direction of movement between the magnetic member 20 and the other magnetic member 10, and the magnetic force of the non-facing magnetic member 10 and the magnetic member 20 can form a component force in the direction of movement, thereby forming a force to drive the actuator to move. By controlling the on and off of the electromagnet or changing the current direction of the electromagnet, it is possible to switch between different pairs of magnetic member 10 and magnetic member 20, thereby adjusting the aperture size.

[0063] In the above-mentioned first embodiment and second embodiment, specifically, the magnetic pole direction of magnetic member 10 and magnetic member 2 20 is perpendicular to the direction of movement. When the magnetic pole direction is perpendicular to the direction of movement, when magnetic member 10 and magnetic member 2 20 are in the attracted state, the magnetic poles are closest, the attracted magnetic force is the largest, the stability is the best, and the position accuracy can be better guaranteed. According to needs, the magnetic pole direction of magnetic member 10 and magnetic member 2 20 can also be in an inclined state with a certain angle to the direction of movement, or the magnetic pole direction is parallel to the direction of movement, which can also play a driving role, but the magnetic force of the required electromagnet is relatively large.

[0064] In the first and second embodiments described above, there is a gap between the magnetic member 10 and the magnetic member 2 20 in the direction of the force acting on them. That is, the positions of the magnetic member 10 and the magnetic member 2 20 satisfy that there is a gap between them in the direction of the force acting on them. In the process of the actuator driving the magnetic member 2 20 to move, there is no friction between the magnetic member 10 and the magnetic member 2 20. And when the magnetic member 10 and the magnetic member 2 20 attract each other, there will be no collision and no friction between the two, which reduces the noise source and significantly reduces the noise compared to motor, lever drive and other methods. As needed, there may be no gap reserved between the magnetic member 10 and the magnetic member 2 20 in the direction of the force acting on them, that is, the gap is zero. In this case, during the movement, noise is easily generated between the magnetic member 10 and the magnetic member 2 20.

[0065] Based on the driving mechanism provided in the above embodiments, the present invention further provides a variable aperture, which includes any one of the driving mechanisms in the above embodiments. Since the variable aperture adopts the driving mechanism in the above embodiments, please refer to the above embodiments for the beneficial effects of the variable aperture.

[0066] In a specific embodiment, see Figure 5 , Figure 5 The diagram is a schematic diagram of the exploded structure of a variable aperture according to a specific embodiment of the present invention. In this embodiment, the variable aperture includes X magnetic components 1, Y magnetic components 2, an aperture housing and a blade assembly.

[0067] The aperture housing is a main supporting structure for mounting the blade assembly. The aperture housing has a central through hole to allow the light path to pass through. The aperture housing is preferably a split structure, such as including an aperture body 6 and a cover plate 1, so as to facilitate the installation of the blade assembly.

[0068] When the variable aperture adopts the above structure, the corresponding blade assembly is used as the above actuating member, the magnetic member 1 is an electromagnet, and X magnetic members 1 are all arranged in the aperture housing, and Y magnetic members 2 are all arranged in the blade assembly, and there is a gap between the magnetic member 1 and the magnetic member 2 in the direction of the force acting on the two, X is a positive integer not less than 2, and Y is a positive integer not less than 1. When a magnetic member 1 and the corresponding magnetic member 2 are in an attracted state, there is an offset in the direction of movement between the remaining magnetic members 1 and the corresponding magnetic member 2. The specific setting method of the magnetic member 1 and the magnetic member 2 can refer to the various embodiments of the above driving mechanism. The aperture size formed by the blade assembly under different attracted states of the magnetic member 1 and the magnetic member 2 is different, and the blade assembly is driven to move by the magnetic member 1 and the magnetic member 2 to form apertures of different sizes.

[0069] Specifically, the blade assembly includes a turntable bracket and a plurality of blades, the turntable bracket is rotatably mounted on the aperture housing, each blade is rotatably connected to the aperture housing, and when the turntable bracket rotates relative to the aperture housing, each blade is driven to rotate to adjust the size of the aperture formed by the blades. The turntable bracket 4 also has a central through hole that allows the light path to pass through, and the plurality of blades 2 cooperate to block the central through hole to adjust the size of the formed aperture. It should be noted that the turntable bracket 4 is rotatably mounted on the aperture housing, which means that the turntable bracket 4 can rotate relative to the aperture housing, and it can be rotatably connected to the aperture housing, so that it can be limited in the aperture housing without being connected to the aperture housing.

[0070] Each blade 2 is rotatably connected to the aperture housing. Specifically, the aperture housing has a fixed shaft 61, and each blade 2 has a positioning hole 22. The blade 2 is sleeved outside the fixed shaft 61 through the positioning hole 22 to rotate around the fixed shaft 61. Through the rotational cooperation of multiple blades 2, the size of the aperture formed by them can be adjusted. Specifically, each blade 2 can be crescent-shaped, and the positioning hole 22 is opened at the head end of the blade 2. As needed, each blade 2 can also be rotatably connected to the aperture housing through a pin shaft or the like.

[0071] When the turntable bracket 4 rotates relative to the aperture housing, it drives each blade 2 to rotate to adjust the size of the aperture formed by the blade 2. That is, the turntable bracket 4 is linked with each blade 2, such as by setting a guide shaft 41 on the turntable bracket 4, and setting an arc-shaped slide groove 21 on each corresponding blade 2, and the guide shaft 41 is inserted into the arc-shaped slide groove 21. When the turntable bracket 4 rotates, the guide shaft 41 slides relatively along the arc-shaped slide groove 21 and pushes the blade 2 to rotate. The rotation amplitude of the blade 2 can be adjusted by setting the position and curvature of the arc-shaped slide groove 21. As needed, the turntable bracket 4 can also push the blade 2 to rotate through a connecting rod assembly, a gear rack assembly, etc.

[0072] Specifically, at least three electromagnets 5 are fixed on one of the aperture housing and the turntable bracket 4, and permanent magnets 3 are arranged on the other one in one correspondence with each electromagnet 5. For the convenience of explanation, the following is an example in which the electromagnet 5 is fixed on the aperture housing and the corresponding permanent magnet 3 is fixed on the turntable bracket 4. In addition, the electromagnet 5 is fixed on the aperture housing, and the position of the electromagnet 5 is fixed during the aperture size adjustment process, so the aperture caliber formed has a high precision. According to needs, the positions of the electromagnet 5 and the permanent magnet 3 can also be interchanged, that is, the electromagnet 5 is fixed on the turntable bracket 4, and the corresponding permanent magnet 3 is fixed on the aperture body 6. At least three pairs of electromagnets 5 and permanent magnets 3 are used, wherein one pair of permanent magnets 3 and electromagnets 5 correspond to the minimum state position of the blade 2 when they are attracted, another pair of permanent magnets 3 and electromagnets 5 correspond to the fully open state position of the blade 2 when they are attracted, and another pair of permanent magnets 3 and electromagnets 5 correspond to the intermediate state position of the blade 2 when they are attracted. It should be noted that the minimum state position mentioned here and below refers to the minimum state position of each blade 2 when it rotates inward, that is, the position of the smallest aperture, and the specific corresponding aperture size can be set as needed, which is not specifically limited here. The fully open state mentioned here and below corresponds to the maximum state position of each blade 2 when it rotates outward, that is, the position of the largest aperture, and the specific aperture size can also be set as needed, which is not specifically limited here. Correspondingly, the intermediate state position is the position between the aforementioned minimum state and the fully open state, such as the half-open position.

[0073] With the above arrangement, when the aperture size is adjusted, if the aperture is adjusted to the minimum state, the electromagnet 5 corresponding to the minimum state of the blade 2 when attracted is adjusted to attract the corresponding permanent magnet 3 by controlling the direction of the current flowing through the electromagnet 5, and the other electromagnets 5 repel the corresponding permanent magnet 3, thereby driving the turntable bracket 4 to rotate to the minimum position corresponding to the blade 2 and maintain it, and by coordinating the suction force with the repulsive force, multiple groups of forces cooperate together to make the position control of the turntable bracket 4 more reliable. According to needs, the electromagnet 5 corresponding to the minimum state can also be adjusted to attract the corresponding permanent magnet 3 by controlling the direction of the current flowing through the electromagnet 5, and the other electromagnets 5 are powered off, which can also drive the turntable bracket 4 to move.

[0074] When the aperture is adjusted to the middle state, the electromagnet 5 corresponding to the middle state of the blade 2 is adjusted to be attracted to the corresponding permanent magnet 3 by controlling the direction of the current flowing through the electromagnet 5, and the other electromagnets 5 are repelled from the corresponding permanent magnet 3, thereby driving the turntable bracket 4 to rotate to the middle position of the corresponding blade 2 and maintain it, and through the combination of suction and repulsion, multiple groups of forces cooperate to make the position control of the turntable bracket 4 more reliable. According to needs, the electromagnet 5 corresponding to the middle state can also be adjusted to be attracted to the corresponding permanent magnet 3 by controlling the direction of the current flowing through the electromagnet 5, and the other electromagnets 5 are powered off, which can also drive the turntable bracket 4 to move.

[0075] When the aperture is adjusted to the fully open state, the electromagnet 5 corresponding to the fully open state of the blade 2 is adjusted to be attracted to the corresponding permanent magnet 3 by controlling the direction of the current flowing through the electromagnet 5, and the other electromagnets 5 are repelled from the corresponding permanent magnet 3, thereby driving the turntable bracket 4 to rotate to the position corresponding to the fully open position of the blade 2 and maintain it, and through the combination of suction and repulsion, multiple groups of forces cooperate to make the position control of the turntable bracket 4 more reliable. According to needs, the electromagnet 5 corresponding to the fully open state can also be adjusted to be attracted to the corresponding permanent magnet 3 by controlling the direction of the current flowing through the electromagnet 5, and the other electromagnets 5 are powered off, which can also drive the turntable bracket 4 to move.

[0076] According to the needs of aperture size adjustment, electromagnets 5 can be set respectively corresponding to the intermediate states of the aperture opening size, and permanent magnets 3 can be set corresponding to the electromagnets 5. The adjustment of the corresponding aperture size can be achieved by adjusting the electromagnets 5 of the corresponding aperture size to be attracted to the corresponding permanent magnets 3.

[0077] For the convenience of description, the pair of permanent magnets 3 and electromagnets 5 corresponding to the fully open position of the blade 2 when attracted are respectively recorded as the first permanent magnet 31 and the first electromagnet 51; the pair of permanent magnets 3 and electromagnets 5 corresponding to the intermediate position of the blade 2 when attracted are respectively recorded as the second permanent magnet 32 ​​and the second electromagnet 52; the pair of permanent magnets 3 and electromagnets 5 corresponding to the minimum position of the blade 2 when attracted are respectively recorded as the third permanent magnet 33 and the third electromagnet 53. In the fully open state of the blade 2, the first permanent magnet 31 and the first electromagnet 51 are attracted, the second electromagnet 52 and the second permanent magnet 32 ​​are partially staggered and the second electromagnet 52 is located behind the minimum rotation direction of the second permanent magnet 32, the third electromagnet 53 and the third permanent magnet 33 are completely staggered, and the third electromagnet 53 is located behind the corresponding third permanent magnet 33 in the minimum rotation direction.

[0078] Specifically, the end of the permanent magnet 3 close to the electromagnet 5 is taken as an example for explanation. Figure 6 and 7As shown, the aperture is fully opened. At this time, the first electromagnet 51 is input with current so that the surface of the first electromagnet 51 facing the first permanent magnet 31 is the S pole. At this time, the magnets are attracted by opposite poles, and the turntable bracket 4 is fixed in place. Figure 7 The final shape of the aperture is as shown in Figure 6 When the second electromagnet 52 is input with current so that the end face of the second electromagnet 52 facing the second permanent magnet 32 ​​is the S pole, the first electromagnet 51 and the third electromagnet 53 are simultaneously input with reverse current so that the end face of the first electromagnet 51 close to the first permanent magnet 31 is the N pole, and the end face of the third electromagnet 53 close to the third permanent magnet 33 is the N pole. At this time, the second electromagnet 52 will attract the second permanent magnet 32, the first electromagnet 51 repels the first permanent magnet 31, and the third electromagnet 53 repels the third permanent magnet 33, then the turntable bracket 4 turns as shown in FIG. Fig. 9 position, so as to reach the intermediate state of the aperture, and the final aperture is as follows Figure 8 shown.

[0079] As in the above manner, when the third electromagnet 53 inputs current so that the end face facing the third permanent magnet 33 is the S pole, the first electromagnet 51 and the second electromagnet 52 input reverse current at the same time, so that the end face of the first electromagnet 51 close to the first permanent magnet 31 is the N pole, and the end face of the second electromagnet 52 close to the second permanent magnet 32 ​​is the N pole. At this time, the third electromagnet 53 will attract the third permanent magnet 33, the first electromagnet 51 repels the first permanent magnet 31, and the second electromagnet 52 repels the second permanent magnet 32, and the turntable bracket 4 turns as shown in FIG. Fig.11 position, so that the aperture is fully minimized, and the final aperture is as follows Fig.10 shown.

[0080] According to the needs, after the above-mentioned turntable bracket 4 rotates to the fully open, middle or minimum state of the blades 2, the electromagnets 5 providing repulsive force can also be powered off, and the position of the turntable bracket 4 is maintained only by the electromagnets 5 providing suction force. Of course, the electromagnets 5 providing suction force and the electromagnets 5 providing repulsive force work together, and multiple forces make the position of the turntable bracket 4 more accurate and reliable, thereby ensuring the accuracy and reliability of the aperture opening.

[0081] It should be noted that, in the above example, the end of the permanent magnet 3 close to the electromagnet 5 is the N pole. The end of the permanent magnet 3 close to the electromagnet 5 can also be set to the S pole as required, and the current direction of the electromagnet 5 can be controlled accordingly.

[0082] The present application adopts the method of electromagnet 5 for driving. In order to make the overall structure more concise, a printed circuit board 7 is fixed on the aperture housing. The printed circuit board 7 is electrically connected to each electromagnet 5 and outputs a forward and / or reverse current to the electromagnet 5 to control the magnetic pole direction of the electromagnet 5 or control the on and off of the electromagnet 5. That is, the electromagnet 5 is powered and the magnetic pole direction of the electromagnet 5 is controlled by the printed circuit board 7 so that it provides suction or repulsion. Preferably, the electromagnet 5 is fixed on the aperture housing, so that the electromagnet 5 remains fixed when the aperture size is adjusted, and it is also convenient for it to be connected to the printed circuit board 7. As needed, the electromagnet 5 can also be controlled by an external power supply and a controller or a reversing switch.

[0083] On the basis of the above embodiments, the aperture housing includes a detachably connected aperture body 6 and a cover plate 1, the turntable bracket 4 and the blades 2 are both assembled in the cavity formed by the aperture body 6 and the cover plate 1, the aperture body 6 has at least three extended accommodating cavities 62 on the side facing away from the turntable bracket 4, each electromagnet 5 is respectively placed in the accommodating cavity 62, and each permanent magnet 3 is respectively fixed on the turntable bracket 4. The aperture body 6 and the cover plate 1 are detachably connected, so as to facilitate the assembly of the turntable bracket 4 and the blades 2. The cover plate 1 covers the aperture body 6 for protection. Specifically, the cover plate 1 is circular, and has ears on both sides of the cover plate 1 to facilitate locking with the aperture body 6. The cover plate 1 has a central through hole, the size of which is determined according to the maximum aperture of the aperture. The aperture body 6 can be specifically a cavity with a circular shape, and has an extended accommodating cavity 62 for accommodating the electromagnet 5. The number of specific accommodating cavities 62 can be set as needed, such as setting three extended cylindrical cavities for accommodating the electromagnet 5. The permanent magnet 3 is fixed on the turntable bracket 4 , and specifically can be embedded in the turntable bracket 4 .

[0084] Furthermore, the aperture body 6 is provided with a plurality of protrusions 64, and the disk surface of the turntable bracket 4 rests on the protrusions 64, or the turntable bracket 4 has a plurality of protrusions 64, and the turntable bracket 4 rests on the aperture body 6 through the protrusions. By providing the protrusions 64, the contact area between the aperture body 6 and the turntable bracket 4 is reduced, thereby reducing the friction between the two when the turntable bracket 4 rotates.

[0085] Furthermore, the aperture body 6 has a positioning protrusion 63 perpendicular to the axial direction of the aperture body 6, the turntable bracket 4 has a limiting guide groove 43 matched with the positioning protrusion 63, and one side of the limiting guide groove 43 has an avoidance groove 44, the positioning protrusion 63 is inserted from the avoidance groove 44 and rotated to abut against the concave table of the limiting guide groove 43 to limit the displacement of the turntable bracket 4 away from the aperture side. Then one side of the turntable bracket 4 is supported on the aperture body 6, such as the convex point 64 of the aperture body 6, and the other side is limited by the matching of the limiting guide groove 43 and the positioning protrusion 63 to prevent the axial movement of the turntable bracket 4. The avoidance groove 44 is located on one side of the limiting guide groove 43, and is used for the positioning protrusion 63 to be inserted. When the positioning protrusion 63 is inserted until its end face is flush with the concave table of the limiting guide groove 43, the turntable bracket 4 is rotated to make the positioning protrusion 63 abut against the limiting guide groove 43. Alternatively, a positioning protrusion 63 perpendicular to the axial direction of the aperture hole can be provided on the turntable bracket 4, and the aperture body 6 has a limiting guide groove 43 that cooperates with the positioning protrusion 63, and one side of the limiting guide groove 43 has an avoidance groove 44, and the positioning protrusion 63 is inserted into the avoidance groove 44 and rotated until it abuts against the concave table surface of the limiting guide groove 43.

[0086] Specifically, the turntable bracket 4 is circumferentially arranged between the aperture body 6 and the blades 2, and the aperture body 6 is respectively provided with a fixed shaft 61 corresponding to each blade 2, and the turntable bracket 4 is respectively provided with an arc-shaped avoidance groove 42 corresponding to each fixed shaft 61, and the fixed shaft 61 passes through the arc-shaped avoidance groove 42, and one end of each blade 2 is respectively provided with a positioning hole 22 to be mounted on the fixed shaft 61, and each blade 2 has an arc-shaped slide groove 21, and the turntable bracket 4 has a guide shaft 41, which is inserted into the arc-shaped slide groove 21. When the turntable bracket 4 rotates, the guide shaft 41 slides along the arc-shaped slide groove 21 and pushes the blade 2 to rotate around the fixed shaft 61 to close inward or open outward.

[0087] Based on the variable aperture provided in the above embodiments, the present invention further provides a lens, which includes any variable aperture in the above embodiments. Since the lens adopts the variable aperture in the above embodiments, please refer to the above embodiments for the beneficial effects of the lens.

[0088] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0089] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A variable aperture driving mechanism, characterized in that: It includes a magnetic component 1 and a magnetic component 2, wherein the magnetic component 1 corresponds to the magnetic component 2 one by one and N pairs are provided, at least one of each pair of the magnetic component 1 and the magnetic component 2 is an electromagnet, each of the magnetic components 1 is fixedly installed, each of the magnetic components 2 is respectively connected to an actuating component having a degree of freedom of movement relative to the magnetic component 1, the plane where the movement paths of the magnetic component 1 and the magnetic component 2 are located is parallel, and when the actuating component is in any aperture gear position, a pair of the magnetic component 1 and the magnetic component 2 is in an attracted state, and at least one pair of the magnetic component 1 and the magnetic component 2 has an offset in the movement direction, wherein N is a positive integer not less than 2.

2. The variable aperture driving mechanism according to claim 1, characterized in that: When the actuating member is in any aperture gear position, at least two pairs of the magnetic members 1 and 2 have offsets in the movement direction and the offsets are different.

3. The variable aperture driving mechanism according to claim 1, characterized in that: When the actuating member is in any aperture gear position, one pair of the magnetic member 1 and the magnetic member 2 is in an attracted state, and the other pairs of the magnetic member 1 and the magnetic member 2 have an offset in the movement direction.

4. The variable aperture driving mechanism according to claim 1, characterized in that: The magnetic pole directions of the magnetic component 1 and the magnetic component 2 are perpendicular to the moving direction.

5. The variable aperture driving mechanism according to claim 1, characterized in that: The magnetic component 1 and the magnetic component 2 are respectively arranged at intervals along the moving direction.

6. The variable aperture driving mechanism according to any one of claims 1 to 4, characterized in that: There is a gap between the first magnetic member and the second magnetic member in the direction of the acting force between the two.

7. A variable aperture driving mechanism, characterized in that: It comprises N magnetic parts one and one magnetic part two, wherein the magnetic part one is an electromagnet, the magnetic part two or all of the magnetic parts one are fixedly installed, and the other is connected to an actuating part, the actuating part has freedom of movement relative to the fixedly installed magnetic part one or the magnetic part two, the magnetic part one is parallel to the plane where the movement paths of the magnetic parts one and the magnetic parts two are located, and when the actuating part is in any aperture gear position, there is an offset in the movement direction between the magnetic part two and at least one of the magnetic parts one, wherein N is a positive integer not less than 2.

8. The variable aperture driving mechanism according to claim 7, characterized in that: The magnetic pole directions of the magnetic component 1 and the magnetic component 2 are perpendicular to the moving direction.

9. The variable aperture driving mechanism according to claim 7 or 8, characterized in that: There is a gap between the first magnetic member and the second magnetic member in the direction of the acting force between the two.

10. A variable aperture, characterized in that: Comprising a driving mechanism as described in any one of claims 1-9.

11. A variable aperture, characterized in that: It comprises X magnetic members 1, Y magnetic members 2, an aperture housing and a blade assembly, wherein X magnetic members 1 are arranged on the aperture housing, Y magnetic members 2 are arranged on the blade assembly, and there is a gap between the magnetic member 1 and the magnetic member 2 in the direction of the acting force of the two, X is a positive integer not less than 2, and Y is a positive integer not less than 1; The magnetic member 1 is an electromagnet. When one of the magnetic members 1 and the corresponding magnetic member 2 is in an attracted state, there is an offset in the movement direction between the other magnetic members 1 and the corresponding magnetic member 2.

12. The variable aperture according to claim 11, characterized in that: A printed circuit board is fixed on the aperture housing. The printed circuit board is electrically connected to each of the electromagnets and outputs a forward and / or reverse current to the electromagnet to control the magnetic pole direction of the electromagnet, or to control the on and off of the electromagnet.

13. The variable aperture according to claim 11 or 12, characterized in that: The blade assembly includes a turntable bracket and a plurality of blades. The turntable bracket is rotatably mounted on the aperture housing. Each blade is rotatably connected to the aperture housing respectively. When the turntable bracket rotates relative to the aperture housing, the turntable bracket drives each blade to rotate to adjust the size of the aperture formed by the blades. The second magnetic component is fixed on the turntable bracket.

14. The variable aperture according to claim 13, characterized in that: The aperture body is provided with a plurality of protrusions, and the disk surface of the turntable bracket rests on the protrusions; or the turntable bracket has a plurality of protrusions, and the turntable bracket rests on the aperture body through the protrusions.

15. The variable aperture according to claim 13, characterized in that: The aperture body is provided with a positioning protrusion perpendicular to the axial direction of the aperture hole, the turntable bracket is provided with a limiting guide groove matched with the positioning protrusion, and one side of the limiting guide groove is provided with an avoidance groove, the positioning protrusion is inserted into the avoidance groove and rotated until it abuts against the concave table surface of the limiting guide groove; Alternatively, the turntable bracket has a positioning protrusion perpendicular to the axial direction of the aperture hole, the aperture body has a limiting guide groove matching the positioning protrusion, and one side of the limiting guide groove has an avoidance groove, the positioning protrusion is inserted into the avoidance groove and rotated until it abuts against the concave table surface of the limiting guide groove.

16. A lens, characterized in that: Comprising a variable aperture as described in any one of claims 10-15.

Images