A dual-blade shutter structure and an infrared lens

Abstract

The application discloses a double-blade shutter structure and an infrared lens. The double-blade shutter structure comprises a shell, a light hole is arranged in the center of the shell, two blades are rotationally arranged in the shell and are distributed on the periphery of the light hole, each blade extends along the circumference of the light hole, the two blades are gathered towards the light hole or dispersed towards the side of the periphery of the light hole to open or close the light hole, a swing shaft is connected with the blades one by one, one end of the swing shaft is rotationally arranged in the shell, the swing shaft swings in a preset angle range, a connecting rod is transmissionally connected with the corresponding blade and the swing shaft, one end of the connecting rod is rotationally arranged in the shell, the other end of the connecting rod is movably connected with the end of the swing shaft away from the swing axis, and the middle part of the connecting rod is movably connected with the blade. The application reduces the required rotation space of each blade through the double-blade structure, utilizes the connecting rod as a transmission part, reduces the rotation range of the swing shaft when driving the blade to rotate, and thus improves the compactness of the shutter structure.

Description

Technical Field

[0001] This application relates to the field of shutter technology, and in particular to a dual-blade shutter structure and an infrared lens. Background Technology

[0002] Current shutter structures typically use a single blade. The U-shaped iron in the shutter structure drives a magnet to rotate, which in turn drives the blade via a pivot on the magnet, thus opening and closing the light aperture. Currently, the single blade in a shutter structure is usually directly driven by the pivot. To meet the opening and closing requirements of the light aperture, the blade needs a large range of motion to completely block or fully open the aperture. Therefore, the shutter housing needs to provide more space for the blade's rotation, resulting in a larger overall size and affecting the shutter's structural compactness.

[0003] Therefore, in view of the above-mentioned technical problems, how to reduce the rotation space required for blade rotation is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of this application is to provide a dual-blade shutter structure and an infrared lens. By using a dual-blade structure, the rotation space required for each blade is reduced, and by using a connecting rod as a transmission component, the rotation range when the swing shaft drives the blades to rotate is reduced, thereby improving the structural compactness of the shutter structure.

[0005] To achieve the above objectives, this application provides a dual-blade shutter structure, comprising:

[0006] A housing, wherein a light-transmitting hole is provided at the center of the housing;

[0007] Two blades are rotatably disposed on the housing and distributed around the light-transmitting hole. Each blade extends circumferentially along the light-transmitting hole. The two blades converge toward the light-transmitting hole or disperse toward the periphery of the light-transmitting hole to open and close the light-transmitting hole.

[0008] A pendulum shaft is connected to each of the blades in a corresponding manner. One end of the pendulum shaft is rotatably mounted on the housing. The pendulum shaft swings within a preset angle range.

[0009] A connecting rod is used to drive the corresponding blade and the swing shaft. One end of the connecting rod is rotatably mounted on the housing, and the other end of the connecting rod is movably connected to the end of the swing shaft away from its swing axis. The middle part of the connecting rod is movably connected to the blade.

[0010] Preferably, the end of the swing shaft away from the swing axis is provided with a first pin, and the end of the connecting rod away from its pivot axis is provided with a first waist-shaped hole. The first pin is movably disposed in the first waist-shaped hole to drive the connecting rod to rotate.

[0011] The connecting rod is provided with a second pin in the middle, and the blade is provided with a second waist-shaped hole. The second pin is movably disposed in the second waist-shaped hole to drive the blade to rotate.

[0012] Preferably, the two blades are centrally symmetrical and arranged sequentially along the axial direction of the light-transmitting hole. The root of the blade is rotatably connected to the housing, and the two blades rotate in opposite directions.

[0013] When the light-transmitting hole is open, the two blades are distributed around the outer periphery of the light-transmitting hole; when the light-transmitting hole is closed, the projection of the two blades along the axial direction of the light-transmitting hole covers the light-transmitting hole.

[0014] Preferably, in the projection of the two blades along the axial direction of the light-transmitting aperture, the root and end of one blade overlap with the end and root of the other blade, respectively.

[0015] Preferably, the housing includes a base, the light-transmitting hole is formed on the base, and a receiving groove is provided on the base around the light-transmitting hole. The pendulum shaft and the connecting rod are disposed in the receiving groove, and the blade, the connecting rod, and the pendulum shaft are arranged sequentially in the axial direction of the light-transmitting hole.

[0016] Preferably, the housing further includes:

[0017] A base plate is fixedly disposed inside the base and covers the upper side of the receiving groove. The blade is located on the side of the base plate away from the receiving groove. An arc-shaped hole is provided on the base plate. The second pin is movably disposed in the arc-shaped hole and passes through the arc-shaped hole and the second waist-shaped hole in sequence.

[0018] A cover plate is fixedly disposed on the base and covers the upper side of the bottom plate, and the blade is located between the cover plate and the bottom plate;

[0019] Along the axial direction of the light-transmitting hole, the base plate, the cover plate, and the base are arranged in sequence, and the blade, the connecting rod, and the swing shaft are arranged in sequence. The cover plate limits the connecting rod along the axial direction of the light-transmitting hole, and both the base plate and the cover plate are provided with through holes corresponding to the light-transmitting hole.

[0020] Preferably, the receiving groove is provided with a first rotating shaft and a second rotating shaft extending along the axial direction of the light-transmitting hole. The first rotating shaft passes through the connecting rod and the base plate in sequence, and the connecting rod rotates about the axis of the first rotating shaft. The second rotating shaft passes through the base plate and the blade in sequence, and the blade rotates about the axis of the second rotating shaft.

[0021] Preferably, the receiving groove is further provided with a driving component for driving the swing shaft to rotate, the driving component comprising:

[0022] A U-shaped electromagnet, fixedly disposed in the receiving groove, includes a U-shaped iron core and a coil wound on the U-shaped arm of the U-shaped iron core, wherein the open end of the U-shaped iron core is magnetic;

[0023] A magnet is disposed inside the open end of the U-shaped iron core. The magnetic poles of the magnet and the magnetic poles of the U-shaped electromagnet are of the same polarity and repel each other, thereby driving the magnet to rotate. The magnet is fixedly connected to the pendulum shaft so that the pendulum shaft swings around the axis of the magnet.

[0024] Preferably, the pendulum shaft is used to generate a force that drives the connecting rod to rotate, and the rotating connecting rod is used to drive the blade to rotate. When the light-transmitting hole is opened and / or closed, the line of action of the force generated by each pendulum shaft passes through the pendulum shaft.

[0025] An infrared lens, comprising:

[0026] Lens tube;

[0027] Several lenses are sequentially arranged inside the lens barrel along the axial direction of the lens barrel;

[0028] The shutter structure is the aforementioned dual-blade shutter structure, which is located between two adjacent lenses.

[0029] Compared to the aforementioned background technology, this application sets the light-transmitting hole at the center of the housing and sets two blades on the outer periphery of the light-transmitting hole, with each blade extending circumferentially along the light-transmitting hole, thereby minimizing the space occupied by the blades in the radial direction of the light-transmitting hole and reducing the radial dimension of the housing. Based on the two blades, each blade has a smaller volume and requires less space to rotate to open and close the light-transmitting hole. Therefore, the housing can be set with a more compact space for the blades to rotate, improving the structural compactness of the shutter structure. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0031] Figure 1 This is an exploded view of the dual-blade shutter structure provided in the embodiments of this application;

[0032] Figure 2 This is a schematic diagram of the blade structure when the light-transmitting aperture is closed, provided in an embodiment of this application.

[0033] Figure 3This is a three-dimensional structural diagram of the swing shaft, connecting rod, and blades when the light-transmitting hole is closed, as provided in the embodiments of this application.

[0034] Figure 4 This is a top view of the swing shaft and connecting rod when the light-transmitting hole is closed, as provided in the embodiments of this application.

[0035] Figure 5 A three-dimensional structural diagram of the swing shaft and connecting rod when the light-transmitting hole is closed, provided in an embodiment of this application.

[0036] Figure 6 This is a schematic diagram of the blade structure when the light-transmitting hole is open, as provided in an embodiment of this application.

[0037] Figure 7 This is a three-dimensional structural diagram of the blade when the light-transmitting hole is open, as provided in an embodiment of this application.

[0038] Figure 8 This is a three-dimensional structural diagram of the swing shaft, connecting rod, and blades when the light-transmitting hole is open, as provided in the embodiments of this application.

[0039] Figure 9 A three-dimensional structural diagram of the swing shaft and connecting rod when the light-transmitting hole is open, provided in an embodiment of this application;

[0040] Figure 10 This is a top view of the swing shaft and connecting rod when the light-transmitting hole is open, as provided in the embodiment of this application.

[0041] In the diagram: 1-base; 2-blade; 3-connecting rod; 4-swing shaft; 5-base plate; 6-cover plate; 7-drive component;

[0042] 11-Light transmission hole; 12-Receiving groove; 13-Second rotating shaft; 14-First rotating shaft;

[0043] 21-Second oblong hole;

[0044] 31-First oblong hole; 32-Second pin;

[0045] 41-First pin; 42-Swing shaft;

[0046] 51 - Arc-shaped hole; 52 - Through hole;

[0047] 71-U-shaped iron core; 72-magnet; 73-coil; 74-wire frame. Detailed Implementation

[0048] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0049] It should be noted that in this embodiment, the orientation or positional relationship indicated by terms such as "upper," "lower," "front," and "rear" is based on the orientation or positional relationship shown in the accompanying drawings. It is used only for the convenience of describing this application and for simplifying the description, and does 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, it should not be construed as a limitation of this application. Furthermore, "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0050] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0051] like Figure 1 As shown, in this embodiment, a dual-blade shutter structure is provided. The shutter structure includes a housing, blades 2, a pivot shaft 4, and a connecting rod 3. A light-transmitting hole 11 is provided at the center of the housing. There are two blades 2, which are rotatably mounted on the housing. Specifically, the two blades 2 are distributed around the outer periphery of the light-transmitting hole 11, and each blade 2 extends circumferentially along the light-transmitting hole 11, thereby reducing the space occupied by the blades 2 in the radial direction of the light-transmitting hole 11, and thus reducing the radial dimension of the housing.

[0052] Furthermore, when the blade 2 is located on the outer periphery of the light-transmitting hole 11, the light-transmitting hole 11 is in the open state. The two blades 2 can be rotated to converge towards the light-transmitting hole 11, so that the middle part of the two blades 2 can reach the position of the light-transmitting hole 11. Please refer to [reference needed]. Figure 2 The two blades 2 have a certain overlap in the middle, which can completely block the light-transmitting hole 11 in the axial direction, thus closing the light-transmitting hole 11. When the light-transmitting hole 11 is closed, the two blades 2 can be rotated to disperse towards the periphery of the light-transmitting hole 11, so that the two blades 2 gradually reach the outer periphery of the light-transmitting hole 11. Please refer to... Figure 6 The two blades 2 can fully open the light-transmitting hole 11 in the axial direction, thus opening the light-transmitting hole 11.

[0053] It should be noted that when the two blades 2 close the light-transmitting hole 11, the middle part of the two blades 2 should have a certain width in the radial direction of the light-transmitting hole 11 to ensure that it can completely cover the light-transmitting hole 11. Based on this, the outer edge of the blade 2 can be set as an arc shape that matches the outer periphery of the shell, so that the blade 2 can make full use of the shape and space of the shell, achieving the goal of minimizing the space occupied by the blade 2 in the shell. Furthermore, the inner edge of the blade 2 is an arc shape that matches the light-transmitting hole 11. That is, when the light-transmitting hole 11 is open, the inner edge of the blade 2 corresponds to the hole wall of the light-transmitting hole 11, and the outer edge of the blade 2 corresponds to the outer periphery of the shell, so that the width of the blade 2 in the radial direction of the light-transmitting hole 11 is minimized, thereby making the radial dimension of the shell smaller and the structure more compact.

[0054] The inner edge of the blade 2 refers to the sidewall of the blade 2 near the light-transmitting hole 11; the outer edge of the blade 2 refers to the sidewall of the blade 2 near the outer periphery of the shell.

[0055] Based on the above embodiments, as long as the middle part of the two blades 2 can completely block the light-transmitting hole 11 at the light-transmitting hole 11, the radial dimension of the middle part of the blade 2 in the light-transmitting hole 11 can be reduced as much as possible. For example, when the light-transmitting hole 11 is closed, the overlapping part of the middle part of the two blades 2 should be reduced as much as possible or the middle parts of the two blades 2 should not overlap.

[0056] The pendulum shaft 4 is connected to the blades 2 in a one-to-one correspondence. One end of the pendulum shaft 4 is rotatably mounted on the housing. The pendulum shaft 4 can swing within a preset angle range. It can be seen that one end of the pendulum shaft 4 is provided with a fixed-position swing shaft 42. The swing shaft 42 is parallel to the axis of the light-transmitting hole 11, and the swing shaft 42 can be located on the pendulum shaft 4 or outside the pendulum shaft 4. No further restrictions are imposed here. Within the swing range of the pendulum shaft 4, it can drive the two blades 2 to rotate between the position of opening the light-transmitting hole 11 and the position of closing the light-transmitting hole 11. In other words, when the pendulum shaft 4 swings to the limit position in the first direction, the two blades 2 reach the position of opening the light-transmitting hole 11. When the pendulum shaft 4 swings to the limit position in the opposite direction to the first direction, the two blades 2 reach the position of closing the light-transmitting hole 11.

[0057] One end of the connecting rod 3 is rotatably mounted on the housing and is used to drive the blade 2 and the swing shaft 4. Each connecting rod 3 is correspondingly driven to drive one blade 2 and one swing shaft 4. The other end of the connecting rod 3 is movably connected to the end of the swing shaft 4 away from its swing axis 42. The middle part of the connecting rod 3 is movably connected to the blade 2. By swinging the swing shaft 4, the connecting rod 3 is driven to rotate. The rotating connecting rod 3 can push the blade 2 to rotate around the axis of the blade 2, so that the two blades 2 rotate in the positions of opening and closing the light passage 11. The connection position between the connecting rod 3 and the blade 2 is located in the middle of the connecting rod 3. Therefore, by driving the blade 2 through the connecting rod 3, the large rotation range of the blade 2 caused by the swing shaft 4 directly driving the blade 2 to rotate is reduced, thereby meeting the small rotation range requirement of the blade 2 and improving the structural compactness of the shutter structure.

[0058] Furthermore, a first pin 41 is provided at the end of the pendulum shaft 4 away from its swing axis 42, and a first waist-shaped hole 31 is provided at the end of the connecting rod 3 away from its rotation axis. The first pin 41 is movably disposed within the first waist-shaped hole 31, thereby driving the connecting rod 3 to rotate through the swing of the pendulum shaft 4. A second pin 32 is provided in the middle of the connecting rod 3, and a second waist-shaped hole 21 is provided on the blade 2. The second pin 32 is movably disposed within the second waist-shaped hole 21, thereby driving the blade 2 to rotate through the rotation of the connecting rod 3, thus opening or closing the light-transmitting hole 11 on the two blades 2.

[0059] It should be noted that since the connection between the connecting rod 3 and the blade 2 is located in the middle of the connecting rod 3, and the connecting rod 3 rotates around one end, the second pin 32 in the middle of the connecting rod 3 has a smaller range of motion than the second waist-shaped hole 21 at the end of the connecting rod 3 when the connecting rod 3 rotates. This allows the blade 2 to obtain a smaller rotation angle to meet the small-range rotation requirements of the double blade 2.

[0060] In some embodiments, the two blades 2 are centrally symmetrical about the axis of the light-transmitting hole 11, and under the drive of the corresponding swing shaft 4 and connecting rod 3, the two blades 2 can rotate synchronously, thereby realizing the opening and closing of the light-transmitting hole 11. When the two blades 2 are centrally symmetrical, the housing provides a more uniform and symmetrical space for the two blades 2, making the space allocation of the housing more reasonable.

[0061] Along the axial direction of the light-transmitting hole 11, two blades 2 are arranged sequentially, with the root of each blade 2 rotatably connected to the housing, and the two blades 2 rotate in opposite directions. The roots of the two blades 2 are positioned far apart from each other, and the ends of the two blades 2 are also positioned far apart from each other. Based on this, the end of one blade 2 is located at the root of the other blade 2, so that when the two blades 2 rotate, the ends of the two blades 2 will rotate in opposite directions. For example, when the light-transmitting hole 11 is closed, the ends of the two blades 2 rotate from both sides of the light-transmitting hole 11 toward the center of the light-transmitting hole 11, with opposite rotation directions. Conversely, when the light-transmitting hole 11 is opened, the ends of the two blades 2 rotate from the center of the light-transmitting hole 11 toward the outside of the light-transmitting hole 11, with opposite rotation directions.

[0062] Since the two blades 2 are arranged sequentially along the axial direction of the light-transmitting aperture 11, in order to improve the smoothness of the rotation of the two blades 2 and avoid interference between the two blades 2 and the other blade 2 in the direction of rotation, the root and end of one blade 2 can be overlapped with the end and root of the other blade 2 in the projection of the two blades 2 along the axial direction of the light-transmitting aperture 11. This ensures that the blade 2 in the upper layer is always above the blade 2 in the lower layer and will not be separated from the original upper and lower layer relationship due to rotation, thus ensuring the rotation effect of the two blades 2.

[0063] The housing of this application includes a base 1, a light-transmitting hole 11 is formed on the base 1, and a receiving groove 12 is provided on the base 1 around the light-transmitting hole 11. The swing shaft 4 and the connecting rod 3 can both be set on the base 1. Specifically, the swing shaft 4 and the connecting rod 3 are set in the receiving groove 12, making full use of the volume of the base 1 itself, so that the swing shaft 4 and the connecting rod 3 do not occupy additional space. In addition, in order to save the radial volume of the base 1, the blade 2, the connecting rod 3, and the swing shaft 4 can be arranged sequentially in the axial direction of the light-transmitting hole 11.

[0064] The housing also includes a base 1 and a cover plate 6. The base 1 is fixedly installed inside the housing and covers the upper side of the receiving groove 121. The base plate 5 can provide a certain axial limit for the swing shaft 4 and the connecting rod 3, ensuring the stability of the swing shaft 4 and the connecting rod 3 in the axial direction of the light-transmitting hole 11. The blade 2 is located on the side of the base plate 5 away from the receiving groove 12. The base plate 5 is provided with an arc-shaped hole 51. The second pin 32 is movably installed in the arc-shaped hole 51 and passes through the arc-shaped hole 51 and the second waist-shaped hole 21 in sequence. The second waist-shaped hole 21 provides a certain guiding function for the second pin 32. The second pin 32 cooperates with the second waist-shaped hole 21 on the blade 2 to drive the blade 2 to rotate.

[0065] The cover plate 6 is fixedly mounted on the base 1 and covers the upper side of the bottom plate 5. The cover plate 6 serves as the upper shell of the housing. The cover plate 6 and the bottom plate 5 form a receiving space for accommodating the blade 2, thereby enabling the blade 2 to be stably set in the receiving space. In addition, since the blade 2 is restricted by the receiving space, the rotational stability of the blade 2 is better. Compared with the single-blade shutter structure, the blade 2 of this application can be a thinner blade 2, thereby saving the space of the housing in the axial direction of the light-transmitting hole 11.

[0066] Based on this, the base plate 5, cover plate 6, and base 1 are sequentially arranged along the axial direction of the light-transmitting hole 11, while the blade 2, connecting rod 3, and swing shaft 4 are sequentially arranged, thereby minimizing the space of the housing in the radial direction of the light-transmitting hole 11 and reducing the overall volume of the door opening structure. Furthermore, the cover plate 6 can also limit the connecting rod 3 in the axial direction of the light-transmitting hole 11, specifically by limiting the second pin 32 on the connecting rod 3, further improving the axial stability of the connecting rod 3. In addition, both the base plate 5 and the cover plate 6 are provided with through holes 52 corresponding to the light-transmitting hole 11, ensuring that the light-transmitting hole 11 can be fully illuminated.

[0067] Please refer to Figure 1 The receiving groove 12 is also provided with a first rotating shaft 14 and a second rotating shaft 13 extending axially along the light-transmitting hole 11. The first rotating shaft 14 passes through the connecting rod 3 and the base plate 5 in sequence, thereby providing a stable rotation axis for the connecting rod 3. Similarly, the second rotating shaft 13 passes through the base plate 5 and the blade 2 in sequence, thereby providing a stable rotation axis for the blade 2.

[0068] The receiving groove 12 is also provided with a driving component 7 for driving the swing shaft 4 to swing. The driving component 7 includes a U-shaped electromagnet and a magnet 72. The U-shaped electromagnet is fixed in the receiving groove 12. The U-shaped electromagnet includes a U-shaped iron core 71 and a coil 73 wound on the U-shaped arm of the U-shaped iron core 71. The coil 73 can be fixed on the U-shaped iron core by a wire frame 74. When the coil 73 is energized, it will generate magnetism at the open end of the U-shaped iron core 71. If a reverse current is applied to the coil 73, the opposite magnetism will be generated at the open end of the U-shaped iron core 71. If the coil 73 is de-energized, the open end of the U-shaped core will have no magnetism.

[0069] Magnet 72 is located inside the open end of the U-shaped iron core 71. Magnet 72 itself is magnetic, and the like poles of magnet 72 and the U-shaped electromagnet repel each other, thus driving magnet 72 to rotate. Furthermore, by changing the direction of current flow through coil 73, bidirectional rotation of magnet 72 is achieved. The principle of the U-shaped electromagnet driving magnet 72 to rotate can be found in existing technology and will not be elaborated here.

[0070] Furthermore, the magnet 72 is fixedly connected to the pendulum shaft 4, thereby enabling the pendulum shaft 4 to swing around the axis of the magnet 72. Based on the bidirectional rotation of the magnet 72, the pendulum shaft 4 can swing within a preset angle range. Specifically, a first central hole can be opened in the middle of the magnet 72, the pendulum shaft 4 is located on the upper side of the magnet 72, and a column extending into the first central hole and fixedly connected to the magnet 72 is provided on the pendulum shaft 4. It can be fixed by means of adhesive, screw connection, etc. The column is provided with a second central hole, and a pin can be provided on the base 1 to cooperate with the second central hole, so that the magnet 72 and the pendulum shaft 4 have a stable axis on the base 1.

[0071] It should be noted that during the rotation of the pendulum shaft 4, the pendulum shaft 4 can interfere with the connecting rod 3, thereby generating a force that drives the connecting rod 3 to rotate. That is, during the oscillation of the pendulum shaft 4, the motion path of its oscillating end will fall on an oscillation circle. Before the blade 2 reaches the position of opening or closing the light-transmitting hole 11, the connecting rod 3 is located in a non-tangential position of the oscillation circle, thereby causing the pendulum shaft 4 to generate a force that drives the connecting rod 3 to rotate. When the blade 2 reaches the position of opening or closing the light-transmitting hole 11, the connecting rod 3 is located in a tangential position of the oscillation circle, and the connecting rod 3 is in a perpendicular position to the pendulum shaft 4, thereby causing the pendulum shaft 4 to exert a force on the connecting rod 3 (such as...). Figure 4 and Figure 10 The line of action of F1 in the middle passes through the swing axis 42 of the pendulum axis 4.

[0072] It can be predicted that while the pendulum 4 exerts a force F1 on the connecting rod 3, the connecting rod 3 will also exert a reaction force on the pendulum 4 (such as...). Figure 4 and Figure 10 In the equation F2), the action force F1 and reaction force F2 are the same in magnitude but opposite in direction. When the blade 2 is driven by the connecting rod 3 to the position where the light-transmitting hole 11 is open and / or closed, the line of action of the force exerted by the pendulum shaft 4 on the connecting rod 3 will pass through the swing axis 42 of the pendulum shaft 4. Therefore, the line of action of the reaction force exerted by the connecting rod 3 on the pendulum shaft 4 will also pass through the swing axis 42 of the pendulum shaft 4. At this time, if the blade 2 tends to move due to the impact, but since the vertical distance from the reaction force of the connecting rod 3 on the pendulum shaft 4 to the swing axis 42 of the pendulum shaft 4 is zero, that is, the lever arm of the pendulum shaft 4 is zero, the connecting rod 3 cannot drive the pendulum shaft 4 to rotate in the opposite direction, and the blade 2 cannot move, thus realizing the self-locking of the blade 2.

[0073] When it is necessary to open the light-transmitting hole 11, the coil 73 is energized, the magnet 72 rotates, thereby driving the pendulum shaft 4 to rotate. The pendulum shaft 4 drives the connecting rod 3 to rotate, and the two blades 2 disperse outwards from the light-transmitting hole 11, so that the light-transmitting hole 11 is in the open state, that is, the blades 2 reach the position where the light-transmitting hole 11 is open. Please refer to... Figures 6 to 8 After blade 2 reaches the position where the light-transmitting hole 11 is opened, connecting rod 3 can no longer rotate. At this time, connecting rod 3 is perpendicular to the swing axis 4. Please refer to... Figure 9 and Figure 10 The line of action of the force exerted by the pendulum shaft 4 on the connecting rod 3 will pass through the swing axis 42 of the pendulum shaft 4. At this time, if the blade 2 tends to move due to the impact, the vertical distance from the reaction force of the connecting rod 3 on the pendulum shaft 4 to the swing axis 42 of the pendulum shaft 4 is zero, that is, the lever arm of the pendulum shaft 4 is zero. Therefore, the connecting rod 3 cannot drive the pendulum shaft 4 to rotate in the opposite direction, and the blade 2 cannot move.

[0074] When it is necessary to close the light-transmitting aperture 11, the coil 73 is reverse-energized, causing the magnet 72 to rotate, which in turn drives the pendulum shaft 4 to rotate. The pendulum shaft 4 then drives the connecting rod 3 to rotate, causing the two blades 2 to converge towards the center of the light-transmitting aperture 11, thus closing the aperture 11. In other words, the blades 2 reach the position where the light-transmitting aperture 11 is closed, achieving image correction. Please refer to [reference needed]. Figure 2 and Figure 3 After blade 2 reaches the position where the light-transmitting hole 11 is closed, the line of action of the force exerted by the pendulum shaft 4 on the connecting rod 3 will also pass through the swing axis 42 of the pendulum shaft 4. Please refer to... Figure 4 and Figure 5 If blade 2 tends to move due to impact, but the vertical distance from the reaction force of link 3 on pendulum 4 to the swing axis 42 of pendulum 4 is zero, that is, the lever arm of pendulum 4 is zero, link 3 cannot drive pendulum 4 to rotate in the opposite direction, and blade 2 cannot move.

[0075] By using the above method, the blade 2 can achieve self-locking when opening and closing the light-transmitting hole 11, thereby preventing the problem of poor shutter structure reliability caused by impact and vibration.

[0076] Currently, most existing shutter structures are designed separately from the infrared lens. As the actuating component, the shutter is susceptible to dust falling onto the detector, forming circular spots. A common practice is to add a germanium sheet to the shutter for dust protection, but this increases the design and manufacturing complexity. This application provides an infrared lens where the shutter structure can be integrated into the center of the lens, solving the problem of dust falling onto the detector and eliminating the need for a dust-proof germanium window, thus simplifying the shutter design. Specifically, the infrared lens includes a lens barrel, lenses, and a shutter structure. Multiple lenses are sequentially arranged along the lens axis within the lens barrel. The shutter structure is the aforementioned dual-blade shutter structure, which can be positioned between two adjacent lenses, thereby solving the problem of dust falling onto the detector caused by the separate lens and shutter design. Furthermore, this infrared lens also possesses all the advantages of the aforementioned dual-blade shutter structure.

[0077] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0078] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A dual-blade shutter structure, characterized in that, include: The housing has a light-transmitting hole (11) at its center. Blade (2), two blades (2) are rotatably disposed on the housing and distributed on the outer periphery of the light-transmitting hole (11). Each blade (2) extends circumferentially along the light-transmitting hole (11). The two blades (2) converge toward the light-transmitting hole (11) or disperse toward the periphery of the light-transmitting hole (11) to open and close the light-transmitting hole (11). The swing shaft (4) is connected to the blade (2) one by one. One end of the swing shaft (4) is rotatably disposed on the housing. The swing shaft (4) swings within a preset angle range. The connecting rod (3) is connected to the corresponding blade (2) and the swing shaft (4). One end of the connecting rod (3) is rotatably disposed on the housing, and the other end of the connecting rod (3) is movably connected to the end of the swing shaft (4) away from its swing axis (42).

2. The dual-blade shutter structure according to claim 1, characterized in that, The swing shaft (4) has a first pin (41) at the end away from the swing shaft (42), and the connecting rod (3) has a first waist-shaped hole (31) at the end away from its axis of rotation. The first pin (41) is movably disposed in the first waist-shaped hole (31) to drive the connecting rod (3) to rotate; and / or The middle part of the connecting rod is movably connected to the blade. The middle part of the connecting rod (3) is provided with a second pin (32), and the blade (2) is provided with a second waist-shaped hole (21). The second pin (32) is movably disposed in the second waist-shaped hole (21) to drive the blade (2) to rotate.

3. The dual-blade shutter structure according to claim 2, characterized in that, The two blades (2) are centrally symmetrical and arranged sequentially along the axial direction of the light-transmitting hole (11). The root of the blade (2) is rotatably connected to the housing, and the two blades (2) rotate in opposite directions. When the light-transmitting hole (11) is open, the two blades (2) are distributed around the outer periphery of the light-transmitting hole (11); when the light-transmitting hole (11) is closed, the projection of the two blades (2) along the axial direction of the light-transmitting hole (11) covers the light-transmitting hole (11).

4. The dual-blade shutter structure according to claim 3, characterized in that, In the projection of the two blades (2) along the axial direction of the light-transmitting hole (11), the root and end of one blade (2) overlap with the end and root of the other blade (2), respectively.

5. The dual-blade shutter structure according to any one of claims 2-4, characterized in that, The housing includes a base (1), a light-transmitting hole (11) is opened on the base (1), and a receiving groove (12) is provided on the base (1) on the outer periphery of the light-transmitting hole (11). The swing shaft (4) and the connecting rod (3) are located in the receiving groove (12), and the blade (2), the connecting rod (3), and the swing shaft (4) are arranged sequentially in the axial direction of the light-transmitting hole (11).

6. The dual-blade shutter structure according to claim 5, characterized in that, The housing also includes: The base plate (5) is fixedly disposed in the base (1) and covers the upper side of the receiving groove (12). The blade (2) is located on the side of the base plate (5) away from the receiving groove (12). The base plate (5) is provided with an arc-shaped hole (51). The second pin (32) is movably disposed in the arc-shaped hole (51) and passes through the arc-shaped hole (51) and the second waist-shaped hole (21) in sequence. The cover plate (6) is fixedly disposed on the base (1) and covers the upper side of the bottom plate (5), and the blade (2) is located between the cover plate (6) and the bottom plate (5); Along the axial direction of the light-transmitting hole (11), the base plate (5), the cover plate (6), and the base (1) are arranged in sequence, and the blade (2), the connecting rod (3), and the swing shaft (4) are arranged in sequence. The cover plate (6) limits the connecting rod (3) along the axial direction of the light-transmitting hole (11), and both the base plate (5) and the cover plate (6) are provided with through holes (52) corresponding to the light-transmitting hole (11).

7. The dual-blade shutter structure according to claim 6, characterized in that, The receiving groove (12) is provided with a first rotating shaft (14) and a second rotating shaft (13) extending axially along the light-transmitting hole (11). The first rotating shaft (14) passes through the connecting rod (3) and the base plate (5) in sequence. The connecting rod (3) rotates about the axis of the first rotating shaft (14). The second rotating shaft (13) passes through the base plate (5) and the blade (2) in sequence. The blade (2) rotates about the axis of the second rotating shaft (13).

8. The dual-blade shutter structure according to claim 7, characterized in that, The receiving groove (12) is also provided with a driving component (7) for driving the swing shaft (4) to rotate. The driving component (7) includes: A U-shaped electromagnet is fixedly disposed in the receiving groove (12), including a U-shaped iron core (71) and a coil (73) wound on the U-shaped arm of the U-shaped iron core (71). The open end of the U-shaped iron core (71) is magnetic. A magnet (72) is located inside the opening end of the U-shaped iron core (71). The magnetic poles of the magnet (72) and the magnetic poles of the U-shaped electromagnet are of the same polarity and repel each other, so as to drive the magnet (72) to rotate. The magnet (72) is fixedly connected to the pendulum shaft (4) so ​​that the pendulum shaft (4) swings around the axis of the magnet (72).

9. The dual-blade shutter structure according to claim 1, characterized in that, The pendulum shaft (4) is used to generate a force to drive the connecting rod (3) to rotate. The rotating connecting rod (3) is used to drive the blade (2) to rotate. When the light-transmitting hole (11) is opened and / or closed, the line of action of the force generated by each pendulum shaft (4) passes through the swing axis (42) of the pendulum shaft (4).

10. An infrared lens, characterized in that, include: Lens tube; Several lenses are sequentially arranged inside the lens barrel along the axial direction of the lens barrel; The shutter structure is the dual-blade shutter structure as described in any one of claims 1-9, wherein the shutter structure is disposed between two adjacent lenses.

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