A shock and vibration resistant shutter

Abstract

The utility model discloses a shutter of anti -impact and vibration, include: casing, middle part is equipped with the light hole, electromagnetic drive mechanism, including the permanent magnet of controlled rotation, permanent magnet is equipped with the swing arm coaxially, the distal end of swing arm is equipped with the swing axle, fixed shaft, be located one side of light hole and be close to corner place, swing axle is located between fixed shaft and permanent magnet, big leaf and small leaf, both one end is equipped with the axle hole, and through axle hole cover sets on fixed shaft, be equipped with linear slot on small leaf, be equipped with sector slot on big leaf, swing axle is located in linear slot and sector slot simultaneously. The utility model discloses under the condition of power failure, free state, through the abutment of sector slot and swing axle, can effectively resist the vibration and impact from each direction, prevent the accidental closing of leaf, improve the static holding reliability of shutter in the harsh environment.

Description

Technical Field

[0001] This utility model relates to the field of camera shutter technology, and in particular to a shutter that is resistant to impact and vibration. Background Technology

[0002] In modern optical systems, the shutter is used to precisely control the opening and closing of the optical path, and its reliability is crucial. In environments with continuous vibration or occasional shocks, such as aerospace, automotive, and industrial inspection, the shutter not only needs to respond quickly but also must maintain its open or closed position stably for a long period after the action is completed (usually in a power-off state). Any unexpected blade misalignment can lead to optical path errors, causing data loss or equipment failure.

[0003] To improve static stability, the industry commonly employs bistable electromagnetic drive mechanisms. These mechanisms activate instantly upon power-on and, upon power-off, rely on the magnetic force of permanent magnets to lock the drive shaft at two extreme positions, offering advantages such as energy saving and low heat generation. However, practice shows that simply ensuring the stability of the drive output shaft is insufficient to guarantee the absolutely reliable position of the terminal blades. Under severe impacts or vibrations, the blade assembly, due to its own inertia, may still experience unexpected parasitic motion or oscillation relative to the locked drive shaft. The root cause lies in design flaws in the transmission structure connecting the drive shaft and the blades. Common connection methods such as linkages and grooves often leave a degree of freedom or gap between the blades and the drive shaft after locking. Under impact or vibration, the impact energy causes the blades to overcome friction or utilize the gap to oscillate slightly. Long-term accumulation or a single strong impact may even cause them to completely detach from their intended position and oscillate towards the light-transmitting hole. Utility Model Content

[0004] The purpose of this invention is to provide a shutter that is resistant to impact and vibration, so as to solve one or more technical problems existing in the prior art, or at least provide a beneficial option or create conditions.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: This utility model provides a shutter that is resistant to impact and vibration, comprising: The housing has a light-transmitting hole in the middle; An electromagnetic drive mechanism includes a controlled rotating permanent magnet, a swing arm coaxially provided with the permanent magnet, and a swing shaft provided at the distal end of the swing arm; A fixed shaft is located on one side of the light-transmitting hole and near a corner, and the swing shaft is located between the fixed shaft and the permanent magnet; Both large and small blades have shaft holes at one end and are sleeved on the fixed shaft through the shaft holes. The small blade has a straight groove and the large blade has a fan-shaped groove. The swing shaft passes through both the straight groove and the fan-shaped groove. When the light-transmitting hole is in the open state, the large blade and the small blade are stacked on one side of the light-transmitting hole, and the swing shaft abuts against the first straight sidewall of the fan-shaped groove. The direction of the force exerted by the first straight sidewall of the fan-shaped groove on the swing shaft is the same as the swing direction of the swing shaft when the light-transmitting hole switches from the open state to the closed state.

[0006] In this technical solution, when the light-transmitting aperture is open, the first straight sidewall of the fan-shaped groove of the large blade is in close contact with the swing shaft. When an impact force attempts to push the large blade toward the light-transmitting aperture, the first straight sidewall will exert a force on the swing shaft, attempting to push it. However, after power is cut off, the swing shaft of the electromagnetic drive mechanism remains in a stable position due to the magnetic attraction induced in the near-end soft magnetic material by the permanent magnet's magnetic field. The impact force or the force applied by the first straight sidewall cannot drive the swing shaft to move. Therefore, the movement of the large blade is positioned at its current position, i.e., maintained in the open state, achieving reliable self-locking. In the power-off and free state, this invention effectively resists vibrations and impacts from all directions through the contact between the fan-shaped groove and the swing shaft, preventing the blade from accidentally closing and improving the static holding reliability of the shutter in harsh environments.

[0007] As a further improvement of this utility model: when the light-transmitting hole switches from the open state to the closed state, the swing shaft swings away from the light-transmitting hole around the axis of the permanent magnet, pushing the straight groove and the fan-shaped groove to swing away from the light-transmitting hole around the fixed axis, so that the large blade and the small blade unfold and jointly block the light-transmitting hole. The output of the drive component is a rotational motion with a limited angle, such as 45°-60°, so the swing shaft moves within a small fan-shaped area, and its swing path away from the light-transmitting hole is an arc path with the axis of the permanent magnet as the center.

[0008] As a further improvement of this utility model: when the light-transmitting hole switches from the open state to the closed state, the movement path of the swing shaft includes the following in sequence: In the first stroke, the blade moves within the straight groove and pushes it to begin swinging around the fixed axis, at which point the swing axis separates from the first straight sidewall of the fan-shaped groove. The second stroke involves moving to contact the second straight sidewall on the other side of the fan-shaped groove, away from the first straight sidewall. In the third stroke, the second straight sidewall of the fan-shaped groove is pushed, causing the large blade to swing around the fixed axis until the closed state. At this time, the large blade and the small blade unfold and jointly block the light-transmitting hole.

[0009] When this improved design is in the open state, the electromagnetic drive mechanism is de-energized, and the permanent magnet is stable in the first position, meaning the swing shaft is stably and tightly pressed against the first straight sidewall. When switching to the closed state, the electromagnetic drive mechanism is energized, changing the magnetic field to drive the permanent magnet and swing arm to rotate. The swing shaft begins to move around the axis of the permanent magnet, sliding within the straight groove, driving the small blade to rotate around the fixed axis, moving from one side of the light-transmitting hole towards the center. At this point, the swing shaft disengages from the fan-shaped groove wall, separating from the first straight sidewall and moving towards the second straight sidewall on the other side. The large blade remains stationary. Then, the swing shaft contacts and begins to push against the second straight sidewall of the fan-shaped groove. At this point, the large and small blades begin to swing around the fixed axis, both blades swinging towards the light-transmitting hole. The swing shaft pushes against the second straight sidewall, causing the large blade to rotate around the fixed axis until both blades are fully extended, blocking the light-transmitting hole, at which point the design is in the closed state. When switching from the closed state to the open state, the electromagnetic drive mechanism is supplied with a reverse current, which drives the swing arm to move in the opposite direction. The swing shaft pushes the large and small blades to stack and retract to the side of the light-transmitting hole along the opposite path. At this time, the light-transmitting hole is in the open state.

[0010] As a further improvement of this utility model: in the open state and the closed state, the line connecting the center of the fixed shaft and the center of the swing shaft is defined as the first line, and the line connecting the axis of the permanent magnet and the center of the swing shaft is defined as the second line; the angle between the first line and the second line is an obtuse angle. The obtuse angle design of the first and second lines allows the swing shaft to swing in a relatively small area between the fixed shaft and the permanent magnet, and makes the swing direction of the swing shaft at the beginning of the state switch be towards the area, that is, the swing shaft moves from the edge of the area towards the area. Therefore, by setting the first sidewall of the fan-shaped groove to abut against the side of the swing shaft away from the center of the area, the force generated when the large blade is impacted or vibrated can be directly applied to the swing shaft. Since the swing shaft remains fixed when the power is off, it can directly offset the force of the large blade, so that the large blade maintains a stable position and state.

[0011] As a further improvement of this utility model: the electromagnetic drive mechanism includes: The magnetic core has a U-shaped arm, with two magnetic poles at the open end of the U-shaped arm located on both sides of the permanent magnet. The permanent magnet remains stable in a first position or a second position under the action of magnetic force, corresponding to the open or closed state of the light-transmitting hole. A coil is wound around the magnetic core. When the coil is energized, the magnetic poles at the open end of the U-shaped arm are changed, driving the permanent magnet and the swing arm to rotate to a second position or a first position. When the coil is de-energized, the permanent magnet remains stable in the first position or the second position under the action of magnetic force.

[0012] The magnetic core and U-shaped arm of this improved scheme are made of soft magnetic materials with high permeability and low coercivity, which ensures strong magnetization when energized and rapid demagnetization when de-energized. The electromagnetic drive mechanism provides a stable, energy-saving and highly reliable power foundation for the entire self-locking scheme, consuming power only at the moment of switching, making it particularly suitable for occasions that need to maintain a certain state for a long time.

[0013] As a further improvement of this utility model: a protrusion is provided between the middle section of the first straight sidewall and the inner arc sidewall of the fan-shaped groove. This improved solution shortens the reset time, and the large blade can start to move without waiting for the swing shaft to complete its idle stroke. At the same time, since the protrusion contacts the swing shaft in advance, it is equivalent to increasing the reset path of the swing shaft on the large blade, making the swing of the large blade smoother.

[0014] As a further improvement of this utility model: the center of the sector-shaped groove coincides with the axis of the fixed shaft. Since the sector-shaped groove acts as the force-bearing object of the swing shaft, and its center coincides with the center of the large blade's swing, unnecessary sliding friction can be eliminated, improving the smoothness of the movement.

[0015] As a further improvement to this invention: the extension line of the centerline of the straight groove intersects the axis of the fixed shaft, and the width of the straight groove is matched with the diameter of the swing shaft using a clearance fit. This improved solution enhances transmission efficiency and ensures response speed.

[0016] As a further improvement of this utility model: the light-transmitting hole is a square hole with rounded corners; the fixed shaft is located on the outside of one corner of the square hole and close to the first side, and the axis of the permanent magnet is close to the second side adjacent to the first side; the swing shaft is located on the outside of the corner. All moving parts are integrated into one corner of the light-transmitting hole, forming an efficient space utilization, realizing the miniaturization and weight reduction of the shutter module, and facilitating integration into a compact optical system.

[0017] As a further improvement of this utility model: the housing includes: The first limiting block is located at the edge of the housing and is outside the large and small blades when in the open state, and is used to restrict the outward swing of the two. The second limiting block is set at the opposite corner of the light-transmitting hole to the corner where the fixed shaft is located, and is used to limit the position of the large blade and the small blade when they swing to the closed state.

[0018] The first and second limiting blocks of this improved design provide stability for the large and small blades in their open and closed states, offering a limiting function. Simultaneously, the limiting blocks and the swing shaft form a clamping and limiting mechanism for the large and small blades, effectively improving their impact and seismic resistance. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is a schematic diagram of the shutter structure in an embodiment; Figure 2 This is an exploded view of the shutter structure in an embodiment; Figure 3 This is a schematic diagram of the structure with the light-transmitting hole in the open state in the embodiment; Figure 4 This is a schematic diagram of the structure in which the light-transmitting hole is in a closed state according to the embodiment; Figure 5 This is a schematic diagram of the structure of the large blade in an embodiment.

[0020] In the attached diagram: 100: housing, 110: light-transmitting hole, 120: first limiting block, 130: second limiting block, 200: electromagnetic drive mechanism, 210: permanent magnet, 220: swing arm, 230: swing shaft, 240: magnetic core, 250: U-shaped arm, 260: coil, 300: fixed shaft, 400: large blade, 410: shaft hole, 420: fan-shaped groove, 421: first straight side wall, 422: second straight side wall, 423: inner arc side wall, 424: protrusion, 500: small blade, 510: straight groove. Detailed Implementation

[0021] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0022] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] In the description of this utility model, if there are words such as "several", they mean one or more, "multiple" means two or more, "greater than", "less than", "exceeding" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself.

[0024] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0025] Reference Figures 1 to 5 The following are several embodiments of a shutter that is resistant to impact and vibration according to this utility model.

[0026] An embodiment of this utility model provides a shutter resistant to shock and vibration, such as... Figures 1 to 5 As shown, it includes: The housing 100 has a light-transmitting hole 110 in the middle; The electromagnetic drive mechanism 200 includes a controlled rotating permanent magnet 210, a swing arm 220 coaxially provided with the permanent magnet 210, and a swing shaft 230 provided at the distal end of the swing arm 220. The fixed shaft 300 is located on one side of the light-transmitting hole 110 and near the corner, and the swing shaft 230 is located between the fixed shaft 300 and the permanent magnet 210; The large blade 400 and the small blade 500 are both provided with a shaft hole 410 at one end and are sleeved on the fixed shaft 300 through the shaft hole 410. The small blade 500 is provided with a straight groove 510 and the large blade 400 is provided with a fan-shaped groove 420. The swing shaft 230 passes through both the straight groove 510 and the fan-shaped groove 420. When the light-transmitting hole 110 is in the open state, the large blade 400 and the small blade 500 are stacked on one side of the light-transmitting hole 110, and the swing shaft 230 abuts against the first straight sidewall 421 of the fan-shaped groove 420. The direction of the force exerted by the first straight sidewall 421 of the fan-shaped groove 420 on the swing shaft 230 is the same as the swing direction of the swing shaft 230 when the light-transmitting hole 110 switches from the open state to the closed state.

[0027] In this embodiment, when the light aperture is open, the first straight sidewall of the fan-shaped groove of the large blade is in close contact with the swing shaft. When an impact force attempts to push the large blade towards the light aperture (closed direction), the first straight sidewall will exert a force on the swing shaft, attempting to push it. However, after power is cut off, the swing shaft of the electromagnetic drive mechanism (bistable electromagnetic mechanism) remains in a stable position due to the magnetic attraction induced in the near-end soft magnetic material (the U-shaped arm opening end of the magnetic core) by the permanent magnet magnetic field. The impact force or the force applied by the first straight sidewall cannot drive the swing shaft to move. Therefore, the movement of the large blade is positioned at its current position, i.e., maintained in the open state, achieving reliable self-locking. In this embodiment, under power-off and free conditions, the contact between the fan-shaped groove and the swing shaft effectively resists vibrations and impacts from all directions, preventing the blade from accidentally closing and improving the static holding reliability of the shutter in harsh environments.

[0028] In an optional embodiment, such as Figures 2 to 4As shown, when the light-transmitting hole 110 switches from the open state to the closed state, the swing shaft 230 swings away from the light-transmitting hole 110 around the axis of the permanent magnet 210, pushing the straight groove 510 and the fan-shaped groove 420 to swing away from the light-transmitting hole 110 around the fixed axis 300, so that the large blade 400 and the small blade 500 unfold and jointly block the light-transmitting hole 110. The output of the drive assembly is a rotational motion with a limited angle, such as 45°-60°, so the swing shaft moves within a small fan-shaped area, and its swing path away from the light-transmitting hole is an arc path centered on the axis of the permanent magnet.

[0029] In an optional embodiment, such as Figures 2 to 4 As shown, when the light-transmitting hole 110 switches from the open state to the closed state, the movement path of the swing shaft 230 includes the following steps in sequence: In the first stroke, the blade 500 moves within the straight groove 510 and pushes the small blade 500 to begin swinging around the fixed shaft 300. At this time, the swing shaft 230 separates from the first straight sidewall 421 of the fan-shaped groove 420. The second stroke involves moving to contact the second straight sidewall 422 on the other side of the fan-shaped groove 420 that is away from the first straight sidewall 421; In the third stroke, the second straight sidewall 422 of the fan-shaped groove 420 is pushed, causing the large blade 400 to swing around the fixed axis 300 until the closed state. At this time, the large blade 400 and the small blade 500 unfold and jointly block the light-transmitting hole 110.

[0030] In this embodiment, when in the open state, the electromagnetic drive mechanism is de-energized, and the permanent magnet is stable in the first position, meaning the swing shaft is stably and tightly abutting against the first straight sidewall. At this time, any impact force attempting to swing the large blade towards the light-transmitting aperture (i.e., the closed direction) will be converted into a force on the swing shaft. Because the swing shaft is fixed by the electromagnetic drive mechanism, the large blade cannot displace under impact or vibration, improving the shutter's impact and vibration resistance. The small blade, through the tight fit between the straight groove and the swing shaft, restricts the radial wobble of the swing shaft, enhancing overall stability.

[0031] Furthermore, during the transition to the closed state, the electromagnetic drive mechanism is energized, changing the magnetic field to drive the permanent magnet and the swing arm to rotate. The swing shaft begins to move around the axis of the permanent magnet, sliding within the straight groove. This drives the small blade to rotate around the fixed axis, moving from one side of the light-transmitting hole towards the center. At this point, the swing shaft disengages from the fan-shaped groove wall, separating from the first straight sidewall and moving towards the second straight sidewall on the other side. The large blade remains stationary. Then, the swing shaft contacts and begins to push the second straight sidewall of the fan-shaped groove. At this time, the large blade and the small blade begin to swing around the fixed axis, both blades swinging towards the light-transmitting hole. The swing shaft pushes the second straight sidewall, causing the large blade to rotate around the fixed axis until both blades are fully extended, blocking the light-transmitting hole, at which point the device is in the closed state.

[0032] Furthermore, when switching from the closed state to the open state, the electromagnetic drive mechanism is supplied with a reverse current, which drives the swing arm to move in the opposite direction. The swing shaft pushes the large and small blades to stack and retract to the side of the light-transmitting hole along the opposite path. At this time, the light-transmitting hole is in the open state.

[0033] In an optional embodiment, such as Figures 2 to 4 As shown, in the open state and the closed state, the line connecting the center of the fixed shaft 300 and the center of the swing shaft 230 is defined as the first line, and the line connecting the axis of the permanent magnet 210 and the center of the swing shaft 230 is defined as the second line; the included angle between the first line and the second line is an obtuse angle.

[0034] In this embodiment, the obtuse angle design of the first and second connecting lines allows the pendulum shaft to swing within a relatively small area (the two obtuse angles face each other towards the enclosed area) between the fixed shaft and the permanent magnet. Furthermore, the swing direction of the pendulum shaft at the start of the state switch is towards the area within the region; that is, the pendulum shaft moves from the edge of the region towards the region. Therefore, by setting the first sidewall of the fan-shaped groove to abut against the side of the pendulum shaft away from the center of the region (i.e., the side of the movement direction when switching from the open state to the closed state), the force generated by the large blade when subjected to impact or vibration can be directly applied to the pendulum shaft. Since the pendulum shaft remains fixed when the power is off, it can directly counteract the force of the large blade, allowing the large blade to maintain a stable position and state. Simultaneously, the large blade is located on the side of the pendulum shaft's movement direction, so it will not interfere with the movement path of the pendulum shaft.

[0035] In an optional embodiment, such as Figures 2 to 4 As shown, the electromagnetic drive mechanism 200 includes: The magnetic core 240 has a U-shaped arm 250. The two magnetic poles at the open end of the U-shaped arm 250 are located on both sides of the permanent magnet 210. The permanent magnet 210 is kept stable in the first position or the second position under the action of magnetic force, corresponding to the open or closed state of the light-transmitting hole 110. A coil 260 is wound around a magnetic core 240. When the coil 260 is energized, the magnetic poles at the open end of the U-shaped arm 250 are changed, driving the permanent magnet 210 and the swing arm 220 to rotate to a second position or a first position. When the coil 260 is de-energized, the permanent magnet 210 remains stable in the first position or the second position under the action of magnetic force.

[0036] The magnetic core and U-shaped arm in this embodiment are made of soft magnetic material with high permeability and low coercivity, which ensures strong magnetization when energized and rapid demagnetization when de-energized. The electromagnetic drive mechanism provides a stable, energy-saving and highly reliable power foundation for the entire self-locking scheme, consuming power only at the moment of switching, making it particularly suitable for occasions where a certain state needs to be maintained for a long time.

[0037] In an optional embodiment, such as Figure 5 As shown, a protrusion 424 is provided between the middle section of the first straight sidewall 421 and the inner arc sidewall 423 of the fan-shaped groove 420. This protrusion 424 is a triangular protrusion located at the corner where the first straight sidewall 421 and the inner arc sidewall 423 intersect. The inner sidewall of the groove is a straight line, which is used to allow the swing shaft to contact the swing shaft in advance after moving away from the second straight sidewall when switching from the closed state to the open state. Thus, the swing shaft starts to drive the large blade to swing around the fixed axis. Then, the swing shaft slides along the inner sidewall of the groove of the protrusion to the final contact position with the first straight sidewall. This embodiment shortens the reset time. The large blade does not need to wait for the swing shaft to complete its idle stroke before it can start to move. At the same time, since the protrusion contacts the swing shaft in advance, it is equivalent to increasing the reset path of the swing shaft on the large blade, making the swing of the large blade smoother.

[0038] In an optional embodiment, such as Figures 2 to 4 As shown, the center of the sector of the sector groove 420 coincides with the axis of the fixed shaft 300. Since the sector groove acts as the force-bearing object of the oscillating shaft, the coincidence of the center of the sector groove with the center of the large blade's oscillation eliminates unnecessary sliding friction and improves the smoothness of the movement.

[0039] In an optional embodiment, such as Figures 2 to 4 As shown, the extension line of the center line of the straight groove 510 intersects the axis of the fixed shaft 300, and the width of the straight groove 510 and the diameter of the swing shaft 230 are matched with a clearance. This embodiment improves transmission efficiency and ensures response speed.

[0040] In an optional embodiment, such as Figures 2 to 4As shown, the light-transmitting aperture 110 is a square aperture with rounded corners; the fixed shaft 300 is located on the outer side of one corner of the square aperture and close to the first side, and the axis of the permanent magnet 210 is close to the second side adjacent to the first side; the swing shaft 230 is located on the outer side of the corner. All moving parts are integrated into one corner of the light-transmitting aperture, forming an efficient space utilization, realizing the miniaturization and weight reduction of the shutter module, and facilitating integration into a compact optical system.

[0041] In an optional embodiment, such as Figures 2 to 4 As shown, the housing 100 includes: The first limiting block 120 is located at the edge of the housing 100 and is outside the large blade 400 and small blade 500 when in the open state, and is used to limit the outward swing of the two. The second limiting block 130 is set at the opposite corner of the light-transmitting hole 110 to the corner where the fixed shaft 300 is located, and is used to limit the position of the large blade 400 and the small blade 500 when they swing to the closed state.

[0042] The first and second limiting blocks in this embodiment provide stability for the large and small blades in their open and closed states, thus providing a limiting function. Simultaneously, the limiting blocks and the swing shaft form a clamping and limiting mechanism for the large and small blades, effectively improving their impact and seismic resistance.

[0043] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A shutter resistant to shock and vibration, characterized in that, include: The housing (100) has a light-transmitting hole (110) in the middle. The electromagnetic drive mechanism (200) includes a controlled rotating permanent magnet (210), the permanent magnet (210) is coaxially provided with a swing arm (220), and the far end of the swing arm (220) is provided with a swing shaft (230). A fixed shaft (300) is located on one side of the light-transmitting hole (110) and near a corner, and a swing shaft (230) is located between the fixed shaft and the permanent magnet (210); Large blade (400) and small blade (500) are provided with shaft holes (410) at one end of each blade and are sleeved on the fixed shaft (300) through the shaft holes (410). The small blade (500) is provided with a straight groove (510) and the large blade (400) is provided with a fan-shaped groove (420). The swing shaft (230) passes through both the straight groove (510) and the fan-shaped groove (420). When the light-transmitting hole (110) is in the open state, the large blade (400) and the small blade (500) are stacked on one side of the light-transmitting hole (110), and the swing shaft (230) abuts against the first straight sidewall (421) of the fan-shaped groove (420). The direction of the force exerted by the first straight sidewall (421) of the fan-shaped groove (420) on the swing shaft (230) is the same as the swing direction of the swing shaft (230) when the light-transmitting hole (110) switches from the open state to the closed state.

2. The shock and vibration resistant shutter according to claim 1, characterized in that: When the light-transmitting hole (110) switches from the open state to the closed state, the swing shaft (230) swings away from the light-transmitting hole (110) around the axis of the permanent magnet (210), pushing the straight groove (510) and the fan-shaped groove (420) to swing away from the light-transmitting hole (110) around the fixed shaft (300), so that the large blade (400) and the small blade (500) unfold and jointly block the light-transmitting hole (110).

3. A shock- and vibration-resistant shutter according to claim 1, characterized in that: When the light-transmitting hole (110) switches from the open state to the closed state, the movement path of the swing shaft (230) includes the following steps: In the first stroke, the blade (500) moves within the straight groove (510) and pushes the small blade (500) to begin swinging around the fixed shaft (300). At this time, the swing shaft (230) separates from the first straight sidewall (421) of the fan-shaped groove (420). In the second stroke, the device moves to contact the second straight sidewall (422) on the other side of the fan-shaped groove (420) away from the first straight sidewall (421); In the third stroke, the second straight sidewall (422) of the fan-shaped groove (420) is pushed, causing the large blade (400) to swing around the fixed axis (300) until the closed state. At this time, the large blade (400) and the small blade (500) unfold and jointly block the light-transmitting hole (110).

4. A shock- and vibration-resistant shutter according to claim 1, characterized in that: In the open state and the closed state, the line connecting the center of the fixed axis (300) and the center of the swing axis (230) is defined as the first line, and the line connecting the axis of the permanent magnet (210) and the center of the swing axis (230) is defined as the second line; the angle between the first line and the second line is an obtuse angle.

5. A shock- and vibration-resistant shutter according to claim 1, characterized in that: The electromagnetic drive mechanism (200) includes: The magnetic core (240) has a U-shaped arm (250), and the two magnetic poles at the open end of the U-shaped arm (250) are respectively located on both sides of the permanent magnet (210). The permanent magnet (210) remains stable in the first position or the second position under the action of magnetic force, corresponding to the open or closed state of the light-transmitting hole (110). A coil (260) is wound around a magnetic core (240). When the coil (260) is energized, the magnetic poles at the open end of the U-shaped arm (250) are changed, driving the permanent magnet (210) and the swing arm (220) to rotate to a second position or a first position. When the coil (260) is de-energized, the permanent magnet (210) remains stable in the first position or the second position under the action of magnetic force.

6. A shock- and vibration-resistant shutter according to claim 1, characterized in that: A protrusion (424) is provided between the middle section of the first straight sidewall (421) and the inner arc sidewall (423) of the fan-shaped groove (420).

7. A shock- and vibration-resistant shutter according to claim 1, characterized in that: The center of the sector of the sector groove (420) coincides with the axis of the fixed shaft (300).

8. A shock- and vibration-resistant shutter according to claim 1, characterized in that: The extension line of the center line of the straight groove (510) intersects the axis of the fixed shaft (300), and the width of the straight groove (510) and the diameter of the swing shaft (230) are matched with a clearance.

9. A shock- and vibration-resistant shutter according to claim 1, characterized in that: The light-transmitting hole (110) is a square hole with rounded corners; the fixed shaft (300) is located outside one corner of the square hole and close to the first side, and the axis of the permanent magnet (210) is close to the second side adjacent to the first side; the swing shaft (230) is located outside the corner.

10. A shock- and vibration-resistant shutter according to claim 1, characterized in that: The housing (100) includes: The first limiting block (120) is located at the edge of the housing (100) and outside the large blade (400) and small blade (500) when in the open state, and is used to limit the outward swing of the two. The second limiting block (130) is set at the opposite corner of the light-transmitting hole (110) to the corner where the fixed shaft (300) is located, and is used to limit the position of the large blade (400) and the small blade (500) when they swing to the closed state.

Images