An aperture shutter assembly with state detection and buffering structure

Abstract

The application discloses a diaphragm shutter assembly with state detection and buffering structure, comprising: a substrate with a central light transmission hole; a driving unit arranged on a first side of the substrate; two blades arranged on a second side of the substrate; a transmission mechanism comprising an intermediate transmission member and a swing shaft, the intermediate transmission member being rotatably mounted on a third fixed column on the first side of the substrate; a state detection assembly comprising a photoelectric sensor and a flexible circuit board, the photoelectric sensor being arranged on the second side of the substrate and located on the side of the far end of one of the blades, the flexible circuit board being electrically connected with the photoelectric sensor and used for real-time detection of the actual opening and closing state of the blades. The driving unit and the blades are arranged on the two sides of the substrate, the electromagnetic interference and mechanical vibration of the driving unit directly affecting the movement precision of the blades are avoided, the detection signal is collected nearby, the electrical connection is concentrated on the first side, the signal transmission path is short, and the anti-interference is strong.

Description

Technical Field

[0001] This invention relates to the field of camera shutter technology, and in particular to an aperture shutter assembly with a state detection and buffer structure. Background Technology

[0002] Aperture shutter assemblies are widely used in cameras, drones, automotive cameras, security monitoring, and industrial vision equipment. The shutter or aperture assembly controls the opening and closing of the light-transmitting aperture to adjust exposure time or control light flux. As shutter devices evolve towards miniaturization, high precision, high reliability, and adaptability to complex operating conditions, higher demands are placed on the drive mechanism, shock absorption capacity, and status feedback accuracy of aperture shutter assemblies. Existing blade drive mechanisms in aperture shutter assemblies can be mainly classified into the following categories based on their transmission method: One type uses a transmission structure with a drive ring and cam groove. An electromagnetic actuator drives the drive ring to rotate, and the cam groove on the drive ring actuates the driven pin on the blade, causing the blade to oscillate around a fixed post. In this type of structure, gaps and collisions easily occur between the driven pin and the cam groove during high-speed start-stop, leading to significant wear after long-term use and a decrease in transmission accuracy. Another type uses a transmission method with gear meshing and a swing arm, utilizing the meshing of a gear swing arm with a transmission component to drive the blade. Although gear transmission has certain self-locking characteristics, gears themselves have backlash. Under vibration or impact conditions, the oscillation error caused by backlash will accumulate, affecting the consistency of the blade opening and closing positions.

[0003] In existing aperture shutter solutions, the blade position is inferred by detecting the amount of movement within a specified time after the blade begins to move. This relies on algorithm compensation, which introduces detection errors and slow response times. Some solutions use grating encoders or phototransistors in conjunction with a notched disk for detection, but these solutions require significant installation space or multiple sensor sets, making them unsuitable for miniaturized devices. Regarding structural layout and electrical connections, existing technologies generally place electrical components such as the drive unit's coil wires and sensor leads on the same side of the substrate as mechanical moving parts such as blades and transmission components. This makes the electrical connection lines susceptible to damage from friction or collisions with moving parts, and makes independent disassembly and assembly difficult during maintenance. While some solutions place the actuator and blade on opposite sides of the substrate, they fail to effectively isolate detection components such as photoelectric sensors and flexible circuit boards from the mechanical moving parts. Furthermore, the sensor signal lines still need to cross the mechanical movement area, posing wiring interference and reliability risks. Summary of the Invention

[0004] The purpose of this invention is to provide an aperture shutter assembly with a state detection and buffer structure to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0005] To achieve the above objectives, the present invention selects the following technical solution: An aperture shutter assembly with state detection and buffer structure includes: A substrate having a central light-transmitting hole, the substrate having a first side and a second side opposite to each other; A driving unit is disposed on the first side of the substrate. The driving unit includes a U-shaped electromagnet and a rotor. The rotor is driven to rotate by the magnetic field generated by the U-shaped electromagnet. A driving arm extends outward from the outside of the rotor. Two blades are disposed on the second side of the substrate. The two blades are oscillatingly mounted on the substrate by the first fixing post and the second fixing post, respectively. The distal ends of the two blades overlap or separate to realize the opening and closing of the central light-transmitting hole. The transmission mechanism includes an intermediate transmission component and a swing shaft. The intermediate transmission component is rotatably mounted on a third fixed post on the first side of the substrate. The intermediate transmission component has a fork arm and a swing arm. The fork arm is connected to the drive arm. The swing shaft is located at the distal end of the swing arm and extends through the substrate to the second side. Two blades are respectively provided with elongated slots corresponding to the swing shaft. The swing shaft passes through the two elongated slots. The state detection component includes a photoelectric sensor and a flexible circuit board. The photoelectric sensor is disposed on the second side of the substrate and located on the far side of one of the blades. The flexible circuit board is electrically connected to the photoelectric sensor and is used to detect the actual opening and closing state of the blade in real time.

[0006] This technical solution places the drive unit and blades on opposite sides of the substrate, avoiding direct impact of electromagnetic interference and mechanical vibration from the drive unit on the blade's motion accuracy. A transmission chain consisting of a drive arm, intermediate transmission components, a swing shaft, and a long through-slot converts the rotor's rotation into synchronous, counter-rotating oscillations of the two blades, eliminating the need for gears or cams and thus backlash error. A photoelectric sensor is installed on the second side and connected across the board via a flexible circuit board, enabling local signal acquisition while concentrating electrical connections on the first side. This results in a short signal transmission path, strong anti-interference capabilities, and ease of maintenance.

[0007] As a further improvement of the present invention: a first through groove is provided on the substrate corresponding to the position of the drive arm, and a drive pin is provided at the end of the drive arm. The drive pin extends through the first through groove to the second side. The fork arm extends axially along the third fixed post to the second side and has a U-shaped fork at its end. The drive pin is placed in the U-shaped fork. When the drive arm swings, the drive pin slides relative to the fork in the U-shaped fork and pushes the fork arm, causing the intermediate transmission component to rotate around the third fixed post. The intermediate transmission component has high rotational stability and smooth transmission.

[0008] As a further improvement of the present invention: the base plate is provided with a fourth fixing post next to the third fixing post, the swing arm is provided with a hook, and an elastic buffer is provided between the fourth fixing post and the hook.

[0009] This improved design integrates an elastic buffer directly into the transmission chain, rather than adding a separate buffer. The hook is set on the swing arm, so that the buffering force acts directly on the intermediate transmission component. The large lever arm results in good buffering effect and fast response.

[0010] As a further improvement of the present invention: the first side of the substrate is sunken to form an assembly groove, the third fixing post is disposed in the assembly groove, the intermediate transmission member is accommodated in the assembly groove, and the groove wall of the assembly groove limits the rotation angle of the intermediate transmission member.

[0011] This improved solution utilizes the wall of the assembly slot as a mechanical limiter, eliminating the need for additional limit blocks, reducing the number of parts, lowering assembly costs, and providing over-rotation protection while preventing blade deformation due to over-travel impact.

[0012] As a further improvement of the present invention: the fourth fixing post is disposed at the edge of the assembly groove, the hook is integrally formed on the swing arm, the elastic buffer is a spring, one end of the spring is hooked to the fourth fixing post, and the other end is hooked to the hook, for providing a restoring force or buffering force for the intermediate transmission component.

[0013] In the improved design, the fourth fixed post is located at the outer edge of the assembly slot, close to the intermediate transmission component but without interfering with its rotation. The spring is directly hooked, requiring no welding or bonding, simplifying assembly and allowing for easy replacement. After the drive stops, the spring pulls the intermediate transmission component back to its initial position, ensuring that the blades are in a known initial state each time it starts. This resists sudden acceleration changes during operation, reduces blade impact noise, and extends service life.

[0014] As a further improvement of the present invention: the blade includes a first blade and a second blade. A detection notch is provided at the distal end of the first blade. The photoelectric sensor is fixed to the second side of the substrate and faces the movement trajectory of the first blade. The detection notch passes through the detection area of ​​the photoelectric sensor as the first blade swings. The photoelectric sensor outputs a corresponding electrical signal by detecting the positional change of the detection notch. This improved solution directly processes the detection notch on the blade, rather than setting a detection mark on the transmission component, directly detecting the blade position. There is no transmission error. The notch is located at the distal end, resulting in a large swing linear velocity, a steep signal change, fast detection response, and high accuracy.

[0015] As a further improvement of the present invention: the distal edge of the second blade corresponding to the photoelectric sensor is a notched end. The notched end passes through the detection area of ​​the photoelectric sensor as the second blade swings. The photoelectric sensor outputs a corresponding electrical signal by detecting the position change of the notched end. Using the solid end of the second blade as a reference mark, a differential signal is formed with the notch of the first blade. The same sensor detects both blades, eliminating the need to increase the number of sensors, resulting in low cost and small size. The opening and closing state of the light-transmitting aperture can be determined by either the notch or the solid end.

[0016] As a further improvement of the present invention: the photoelectric sensor is a transmission-type photoelectric sensor; When the two blades move to the closed position of the central light-transmitting hole, the detection notch of the first blade is aligned with the detection area of ​​the photoelectric sensor, and the blocking end of the second blade is offset from the detection area. When the two blades move to the open position of the central light-transmitting hole, the detection notch of the first blade deviates from the detection area, and the blocking end of the second blade faces the detection area and blocks the light path of the photoelectric sensor. The photoelectric sensor identifies whether the detection area is in a partially open, light-transmitting state or a solid, blocked state, and outputs a corresponding electrical signal to distinguish the open or closed state of the central light-transmitting hole.

[0017] In the improved design, the transmissive photoelectric sensor includes a light-emitting diode and a photosensitive diode arranged opposite each other, with the blade passing through the middle. When in the closed state, the detection notch is within the detection area, and the transmissive photoelectric sensor outputs a high level; when in the open state, the blocked end is within the detection area, and the transmissive photoelectric sensor outputs a low level. By utilizing the alternating blocking of the notch and solid parts, a single sensor can detect bistable states, simplifying the structure and improving reliability.

[0018] As a further improvement of the present invention: a second through-groove is provided on the substrate corresponding to the position of the photoelectric sensor. The flexible circuit board passes through the second through-groove from the first side of the substrate and forms a fixed end on the second side of the substrate. The photoelectric sensor is soldered or bonded to the fixed end. The sensor signal directly passes through the substrate from the second side to the control circuit on the first side, and the signal path is not affected by mechanical movement on the second side.

[0019] As a further improvement of the present invention, the driving unit further includes a coil wound around the U-shaped electromagnet, the U-shaped electromagnet having an opening, the rotor being disposed within the opening, and the rotor rotating within the opening under the action of a magnetic field. The U-shaped electromagnet has a simple structure, high magnetic circuit efficiency, and low power consumption. Attached Figure Description

[0020] To more clearly illustrate the technical solution, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the aperture and shutter assembly.

[0022] Figure 2 This is a schematic diagram of the exploded structure of the aperture and shutter assembly.

[0023] Figure 3 This is a schematic diagram of the structure of the first side of the substrate.

[0024] Figure 4 This is a schematic diagram of the structure of the second side of the substrate.

[0025] Figure 5 This is a schematic diagram of the transmission mechanism.

[0026] Reference numerals: 100: substrate, 110: central light-transmitting hole, 120: first through slot, 130: assembly slot, 140: second through slot, 200: drive unit, 210: U-shaped electromagnet, 220: rotor, 230: drive arm, 231: drive pin, 240: coil, 300: blade, 310: first blade, 320: second blade, 330: detection notch, 340: blocking end, 410: first fixing post, 420: second fixing post, 430: third fixing post, 440: fourth fixing post, 510: intermediate transmission component, 511: fork arm, 512: swing arm, 513: U-shaped fork, 514: hook, 520: swing shaft, 600: photoelectric sensor, 610: flexible circuit board. Detailed Implementation

[0027] In order to clearly and completely understand the technical solution, the present invention will be further described in conjunction with the embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0029] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0030] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0031] like Figures 1 to 5 As shown, an embodiment of the present invention provides an aperture shutter assembly with a state detection and buffer structure, comprising: The substrate 100 has a central light-transmitting hole 110, and the substrate 100 has opposing first and second sides; A driving unit 200 is disposed on the first side of the substrate 100. The driving unit 200 includes a U-shaped electromagnet 210 and a rotor 220. The rotor 220 is driven to rotate by the magnetic field generated by the U-shaped electromagnet 210. A driving arm 230 extends outward from the outside of the rotor 220. Two blades 300 are disposed on the second side of the substrate 100. The two blades 300 are swayably mounted on the substrate 100 by the first fixing post 410 and the second fixing post 420 respectively. The distal ends of the two blades 300 overlap or separate to realize the opening and closing of the central light-transmitting hole 110. The transmission mechanism includes an intermediate transmission component 510 and a swing shaft 520. The intermediate transmission component 510 is rotatably mounted on a third fixed post 430 on the first side of the substrate 100. The intermediate transmission component 510 has a fork arm 511 and a swing arm 512. The fork arm 511 is connected to the drive arm 230. The swing shaft 520 is located at the distal end of the swing arm 512 and extends through the substrate 100 to the second side. Two blades 300 are respectively provided with elongated slots corresponding to the swing shaft 520. The swing shaft 520 passes through the two elongated slots. The state detection component includes a photoelectric sensor 600 and a flexible circuit board 610. The photoelectric sensor 600 is disposed on the second side of the substrate 100 and located on the far side of one of the blades. The flexible circuit board 610 is electrically connected to the photoelectric sensor 600 and is used to detect the actual opening and closing state of the blade 300 in real time.

[0032] In this embodiment, the substrate serves as a support, with the first side being the driving side for mounting the driving unit and intermediate transmission components, and the second side being the execution side for mounting the blades and sensors, achieving electrical and mechanical partitioning and isolation. The rotor is located within the U-shaped opening of the U-shaped electromagnet. When the coil is energized, it generates a magnetic field that drives the rotor to rotate, forming an electromagnetic drive source. A rigid arm extending from the outside of the rotor converts the rotor's rotational motion into the swinging motion of the driving arm. The intermediate transmission component rotates around a third fixed post, and its fork arm receives the motion of the driving arm. The swinging arm outputs motion to the swinging shaft, which simultaneously passes through the long slots on both blades. When the swinging shaft swings, it pushes against the slot walls, causing the two blades to swing synchronously in opposite directions around their respective fixed posts, ensuring motion synchronization. The sensor is located on the second side, and a flexible circuit board passes through the substrate from the first side to supply power and transmit signals, achieving non-destructive real-time detection. It is understood in the art that photoelectric sensors typically need to work in conjunction with light-transmitting or reflective features on the blades (such as notches, openings, and reflective surfaces). In this embodiment, at least one mark that can be identified by the sensor is provided on the blade. The specific marking features will be further described in the following embodiments.

[0033] In this embodiment, the drive unit and blades are placed on opposite sides of the substrate to avoid electromagnetic interference and mechanical vibration of the drive unit directly affecting the blade movement accuracy. A transmission chain consisting of a drive arm, intermediate transmission component, swing shaft, and long through slot is used to convert the rotor's rotation into synchronous counter-oscillation of the two blades, eliminating the need for gears or cams and thus eliminating backlash error. A photoelectric sensor is installed on the second side and connected across the board with a flexible circuit board, enabling the detection signal to be collected nearby while the electrical connection is concentrated on the first side. This results in a short signal transmission path, strong anti-interference, and ease of maintenance.

[0034] In an optional embodiment, such as Figures 3 to 5 As shown, a first through groove 120 is provided on the substrate 100 corresponding to the position of the drive arm 230. A drive pin 231 is provided at the end of the drive arm 230. The drive pin 231 extends through the first through groove 120 to the second side. The fork arm 511 extends to the second side along the axial direction of the third fixing post 430 and is provided at the end with a U-shaped fork 513. The drive pin 231 is placed in the U-shaped fork 513.

[0035] In this embodiment, the drive pin is a cylindrical pin at the end of the drive arm. The first through slot allows the drive pin at the end of the drive arm to pass from the first side to the second side, while providing space for the drive pin to swing. The fork arm extends along the axial direction of the third fixed post (perpendicular to the substrate direction) through the first through slot to the second side, thereby forming a U-shaped fork on the second side. The drive pin is engaged in the U-shaped fork, forming a sliding / rotating pair. When the drive arm swings, the drive pin slides relative to the fork in the U-shaped fork and pushes the fork arm, causing the intermediate transmission component to rotate around the third fixed post. The intermediate transmission component has high rotational stability and smooth transmission.

[0036] In an optional embodiment, such as Figures 3 to 5 The base plate 100 is provided with a fourth fixing post 440 next to the third fixing post 430, and a hook 514 is provided on the swing arm 512. An elastic buffer (not shown in the figure) is provided between the fourth fixing post 440 and the hook 514.

[0037] In this embodiment, the fourth fixed post is fixed to the first side of the base plate, near the third fixed post, serving as a fixing point for one end of the elastic buffer. A hook is formed on the swing arm of the intermediate transmission component and is used to hook the other end of the elastic buffer. The elastic buffer can be a tension spring, a torsion spring, or an elastic rubber component. When the intermediate transmission component rotates around the third fixed post under the push of the drive arm, the hook moves accordingly, stretching or compressing the elastic buffer. The elastic buffer generates a restoring force opposite to the direction of motion. This restoring force assists the intermediate transmission component in resetting at the end of the drive, while absorbing impact energy during movement, slowing down sudden speed changes, and suppressing accidental swaying of the intermediate transmission component under external vibration conditions. This embodiment directly integrates the elastic buffer into the transmission chain, rather than adding a separate buffer. The hook is set on the swing arm, allowing the buffering force to act directly on the intermediate transmission component, resulting in a large lever arm, good buffering effect, and fast response.

[0038] In an optional embodiment, such as Figure 2 and Figure 3 As shown, the first side of the substrate 100 is recessed to form an assembly groove 130, the third fixing post 430 is disposed in the assembly groove 130, the intermediate transmission member 510 is accommodated in the assembly groove 130, and the groove wall of the assembly groove 130 limits the rotation angle of the intermediate transmission member 510.

[0039] In this embodiment, the assembly groove is a recessed area formed by milling or molding on the first side of the substrate. The intermediate transmission component is completely or partially (in the thickness direction) recessed into the groove. The inner wall of the groove acts as a mechanical stop, limiting the maximum swing angle of the intermediate transmission component, thereby indirectly limiting the opening and closing limit positions of the blades. This embodiment utilizes the groove wall directly as a mechanical limiter, eliminating the need for additional limit blocks, reducing the number of parts, lowering assembly costs, and simultaneously providing over-rotation protection to prevent blade deformation due to over-travel impact.

[0040] In an optional embodiment, such as Figure 2 and Figure 3 The fourth fixing post 440 is disposed on the edge of the assembly groove 130, the hook 514 is integrally formed on the swing arm 512, the elastic buffer is a spring, one end of the spring is hooked on the fourth fixing post 440, and the other end is hooked on the hook 514, which is used to provide a restoring force or buffering force for the intermediate transmission component 510.

[0041] In this embodiment, the fourth fixed post is located at the outer edge of the assembly slot, that is, close to the intermediate transmission component but without interfering with its rotation. The spring is directly hooked, requiring no welding or bonding, making assembly simple and replaceable. After the drive stops, the spring pulls the intermediate transmission component back to its initial position, ensuring that the blade is in a known initial state each time it starts, resisting sudden acceleration changes during movement, reducing blade impact noise, and extending service life.

[0042] In an optional embodiment, such as Figure 4 and Figure 5 As shown, the blade 300 includes a first blade 310 and a second blade 320. The distal end of the first blade 310 is provided with a detection notch 330. The photoelectric sensor 600 is fixed to the second side of the substrate 100 and faces the movement trajectory of the first blade 310. The detection notch 330 passes through the detection area of ​​the photoelectric sensor 600 as the first blade 310 swings. The photoelectric sensor 600 outputs a corresponding electrical signal by detecting the position change of the detection notch 330.

[0043] In this embodiment, a notch, such as a U-shape, V-shape, or rectangle, is machined into the distal edge of the first blade. This area contains no blade material, allowing light to pass through. A sensor is fixed to the second side of the substrate, and its detection area is located along the arc traversed by the distal end of the first blade during its swing. When the detection notch passes through the sensor's detection area, the optical path changes, and the sensor's output level changes abruptly. By detecting the timing or duration of this change, it can be determined whether the first blade is in position. This embodiment directly machines the detection notch onto the blade, rather than setting detection marks on the transmission component, directly detecting the blade position. There is no transmission error, the notch is located at the distal end, the swing linear velocity is high, the signal change is steep, the detection response is fast, and the accuracy is high.

[0044] In an optional embodiment, such as Figure 4 and Figure 5 As shown, the second blade 320 has a notch-free blocking end 340 at the distal edge of the photoelectric sensor 600. The blocking end 340 passes through the detection area of ​​the photoelectric sensor 600 as the second blade 320 swings. The photoelectric sensor 600 outputs a corresponding electrical signal by detecting the position change of the blocking end 340.

[0045] In this embodiment, the obstructed end is the distal edge of the second blade, which is a solid, opaque structure. Because the first and second blades swing synchronously in opposite directions, the distal end of the second blade also passes through the same fixed detection area as the first blade, allowing the sensor to detect the obstructed end of the second blade.

[0046] In this embodiment, the solid end of the second blade is used as a reference mark to form a differential signal with the notch of the first blade. The same sensor detects both blades, eliminating the need to increase the number of sensors. This method is low-cost and small in size. The opening and closing status of the light-transmitting hole can be determined by the two features of the notch or the solid end.

[0047] In an optional embodiment, such as Figure 3 and Figure 4 As shown, the photoelectric sensor 600 is a transmission type photoelectric sensor; When the two blades 300 move to the closed position of the central light-transmitting hole 110, the detection notch of the first blade 310 is directly opposite the detection area of ​​the photoelectric sensor 600, and the blocking end 340 of the second blade 320 is offset from the detection area. When the two blades 300 move to the open position of the central light-transmitting hole 110, the detection notch 330 of the first blade 310 deviates from the detection area, and the blocking end 340 of the second blade 320 faces the detection area and blocks the light path of the photoelectric sensor 600. The photoelectric sensor 600 identifies whether the detection area is in a notched, light-transmitting state or a solid, blocked state, and outputs a corresponding electrical signal to distinguish the opening and closing state of the central light-transmitting hole 110.

[0048] In this embodiment, the transmissive photoelectric sensor includes a light-emitting diode and a photosensitive diode arranged opposite each other, with the blade passing through the middle. When in the closed state, the detection notch is in the detection area, and the transmissive photoelectric sensor outputs a high level; when in the open state, the blocked end is in the detection area, and the transmissive photoelectric sensor outputs a low level. By utilizing the alternating blocking of the notch and the solid portion, a single sensor can detect bistable states, simplifying the structure and improving reliability.

[0049] In an optional embodiment, such as Figure 1 and Figure 3 and Figure 4 As shown, a second through groove 140 is provided on the substrate 100 corresponding to the position of the photoelectric sensor 600. After the flexible circuit board 610 passes through the second through groove 140 from the first side of the substrate 100, a fixed end is formed on the second side of the substrate 100. The photoelectric sensor 600 is welded or bonded to the fixed end.

[0050] In this embodiment, the second through-slot is a through-slot through which the flexible circuit board passes, and it also provides assembly space for the photoelectric sensor. A portion of the flexible circuit board can be configured to first be flat against the first side surface of the substrate, and then extend along the surface (or extend along the structural surface according to the actual structural layout) to the second through-slot. The end is fixed in the second through-slot to form a fixed end, and the photoelectric sensor is directly soldered to the fixed end of the flexible circuit board. The sensor signal directly passes through the substrate from the second side to the control circuit on the first side, and the signal path is free from interference from mechanical movement on the second side.

[0051] In an optional embodiment, such as Figure 3 and Figure 5 As shown, the driving unit 200 also includes a coil 240 wound around the U-shaped electromagnet 210. The U-shaped electromagnet 210 has an opening, and the rotor 220 is disposed in the opening. The rotor 220 rotates in the opening under the action of a magnetic field.

[0052] In this embodiment, the U-shaped electromagnet consists of a U-shaped yoke made of soft magnetic material, with the opening facing the rotor. A coil is wound around the arm of the U-shaped electromagnet, and the rotor, a permanent magnet, is positioned inside the U-shaped opening. When the coil is energized, a magnetic field is generated within the U-shaped opening, driving the rotor to rotate. The U-shaped electromagnet has a simple structure, high magnetic circuit efficiency, and low power consumption.

[0053] The above disclosures are merely one or more preferred embodiments of the present invention, intended to help understand the inventive concept of the technical solution, and are not intended to limit the present invention in any other way. Any other equivalent or conventional substitution schemes made by those skilled in the art based on the features defined by the present invention shall still fall within the scope of the present invention.

Claims

1. An aperture shutter assembly with state detection and buffer structure, characterized in that, include: A substrate (100) has a central light-transmitting hole (110) and the substrate (100) has opposing first and second sides; A driving unit (200) is disposed on the first side of the substrate (100). The driving unit includes a U-shaped electromagnet (210) and a rotor (220). The rotor (220) is driven to rotate by the magnetic field generated by the U-shaped electromagnet (210). A driving arm (230) extends outward from the outside of the rotor (220). Two blades (300) are disposed on the second side of the substrate (100). The two blades (300) are swayably mounted on the substrate (100) by the first fixing post (410) and the second fixing post (420), respectively. The far ends of the two blades (300) overlap or separate to realize the opening and closing of the central light-transmitting hole (110). The transmission mechanism includes an intermediate transmission component (510) and a swing shaft (520). The intermediate transmission component (510) is rotatably mounted on a third fixed post on the first side of the substrate (100). The intermediate transmission component (510) has a fork arm (511) and a swing arm (512). The fork arm (511) is connected to the drive arm (230). The swing shaft (520) is located at the far end of the swing arm (512) and extends through the substrate (100) to the second side. The two blades (300) are respectively provided with elongated through slots corresponding to the swing shaft (520). The swing shaft (520) passes through the two elongated through slots. The state detection component includes a photoelectric sensor (600) and a flexible circuit board (610). The photoelectric sensor (600) is disposed on the second side of the substrate (100) and located on the far side of one of the blades (300). The flexible circuit board (610) is electrically connected to the photoelectric sensor (600) and is used to detect the actual opening and closing state of the blade (300) in real time.

2. The aperture shutter assembly with state detection and buffer structure according to claim 1, characterized in that: The base plate (100) is provided with a first through groove (120) corresponding to the position of the drive arm (230). The end of the drive arm (230) is provided with a drive pin (231). The drive pin (231) extends through the first through groove (120) to the second side. The fork arm (511) extends to the second side along the axial direction of the third fixed post (430) and is provided with a U-shaped fork (513) at its end. The drive pin (231) is placed in the U-shaped fork (513).

3. The aperture shutter assembly with state detection and buffer structure according to claim 1, characterized in that: The base plate (100) is provided with a fourth fixed post (440) next to the third fixed post (430), and a hook (514) is provided on the swing arm (512). An elastic buffer is provided between the fourth fixed post (440) and the hook (514).

4. An aperture shutter assembly with state detection and buffer structure according to claim 3, characterized in that: The first side of the substrate (100) is recessed to form an assembly groove (130), the third fixing post (430) is disposed in the assembly groove (130), the intermediate transmission member (510) is accommodated in the assembly groove (130), and the groove wall of the assembly groove (130) limits the rotation angle of the intermediate transmission member (510).

5. An aperture shutter assembly with state detection and buffer structure according to claim 4, characterized in that: The fourth fixed post (440) is located at the edge of the assembly groove (130), the hook (514) is integrally formed on the swing arm (512), the elastic buffer is a spring, one end of the spring is hooked on the fourth fixed post (440), and the other end is hooked on the hook (514), which is used to provide a restoring force or buffering force for the intermediate transmission component (510).

6. The aperture shutter assembly with state detection and buffer structure according to claim 1, characterized in that: The blade (300) includes a first blade (310) and a second blade (320). The first blade (310) has a detection notch (330) at its distal end. The photoelectric sensor (600) is fixed to the second side of the substrate (100) and faces the movement trajectory of the first blade (310). The detection notch (330) passes through the detection area of ​​the photoelectric sensor (600) as the first blade (310) swings. The photoelectric sensor (600) outputs a corresponding electrical signal by detecting the position change of the detection notch (330).

7. An aperture shutter assembly with state detection and buffer structure according to claim 6, characterized in that: The second blade (320) has a notched blocking end (340) at the far edge of the photoelectric sensor (600). The blocking end (340) passes through the detection area of ​​the photoelectric sensor (600) as the second blade (320) swings. The photoelectric sensor (600) outputs a corresponding electrical signal by detecting the position change of the blocking end (340).

8. An aperture shutter assembly with state detection and buffer structure according to claim 7, characterized in that: The photoelectric sensor (600) is a transmission type photoelectric sensor; When the two blades (300) move to the closed position of the central light-transmitting hole (110), the detection notch (330) of the first blade (310) is directly opposite the detection area of ​​the photoelectric sensor (600), and the blocking end (340) of the second blade (320) is offset from the detection area. When the two blades (300) move to the open position of the central light-transmitting hole (110), the detection notch (330) of the first blade (310) deviates from the detection area, and the blocking end (340) of the second blade (320) faces the detection area and blocks the light path of the photoelectric sensor (600). The photoelectric sensor (600) identifies whether the detection area is in a notched, light-transmitting state or a solid, blocked state, and outputs a corresponding electrical signal to distinguish the opening and closing state of the central light-transmitting hole (110).

9. An aperture shutter assembly with state detection and buffer structure according to claim 1, characterized in that: A second through groove (140) is provided on the substrate (100) corresponding to the position of the photoelectric sensor (600). After the flexible circuit board (610) passes through the second through groove (140) from the first side of the substrate (100), a fixed end is formed on the second side of the substrate (100). The photoelectric sensor (600) is welded or bonded to the fixed end.

10. An aperture shutter assembly with state detection and buffer structure according to claim 1, characterized in that: The drive unit (200) also includes a coil (240) wound around the U-shaped electromagnet (210), the U-shaped electromagnet (210) having an opening, the rotor (220) being disposed in the opening, and the rotor (220) rotating in the opening under the action of a magnetic field.

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