Projection field blocking device and method for blocking thereof

Abstract

The present application relates to the technical field of exposure machine, especially to a projection visual field shielding device and a shielding method thereof, comprising a machine shell, a main light shielding plate, a rotating mechanism, a secondary light shielding plate and a translation mechanism, the machine shell is provided with a projection visual field area, the main light shielding plate is arranged in a fan shape, the rotating mechanism comprises a rotating ring, a first coil, a first magnet and a ball seat, the translation mechanism comprises a guide rail, a sliding block, a second coil and a second magnet, the secondary light shielding plate is arranged in a rectangular shape, the projection visual field area can be completely exposed and completely shielded, the main light shielding plate preliminarily shields the projection visual field area, forming an irregular visual field shape, the secondary light shielding plate is used for trimming the irregular visual field shape, the movement of the main light shielding plate and the movement of the secondary light shielding plate are independent and do not interfere with each other, the structure is simple, the control precision requirement of the main light shielding plate is low, the secondary light shielding plate can be arranged in a small area, the space occupation is reduced, the weight is light, and high-precision control is facilitated.

Description

Technical Field

[0001] This invention relates to the field of exposure machine technology, and in particular to a projection field of view blocking device and its blocking method. Background Technology

[0002] As display panel sizes continue to increase, the size of exposure machines, which are the main production equipment, is also increasing. Projection systems are gradually shifting from single systems to splicing multiple projection systems. Depending on the requirements of the exposure pattern, the projection field of view needs to be masked to achieve a specific size for exposure. Furthermore, based on the projection focus requirements, the distance between the projection system and the glass substrate needs to be controlled within a few millimeters. Therefore, the corresponding masking system has limited structural space, requiring a sufficiently compact and flat structure. Moreover, to ensure exposure accuracy, the masking system also needs to guarantee sufficient precision and masking range.

[0003] There are two types of existing light-shielding systems. One type, such as the manufacturing method of a circuit device disclosed in US6583854B1, has a light-shielding system for each projection system. However, the middle light-shielding system needs to be placed above the projection field of view because there is not enough space on the left and right sides. Therefore, when the system is running, the shielding plate needs to first block the entire field of view downwards, and then move to the left and right to expose part of the field of view. Each shielding plate in this way needs to be set with two degrees of freedom coupling, which requires high-precision control and has a relatively complex structure. Moreover, due to the limited space, the middle shielding plate cannot completely expose the entire field of view. Another type, such as the lithography machine blade assembly, large field-of-view lithography machine, and exposure method disclosed in patent number CN107450271B, uses two light-shielding plates to block light from three fields of view. When one of the light-shielding plates blocks the middle field of view, one side of the field of view is in a fully exposed state. Only by setting the area of ​​the light-shielding plate to be large enough can one side of the field of view be completely blocked. However, the light-shielding plates in this way are large in area and heavy in weight, which is not conducive to high-precision control. The motor heats up severely when driving the light-shielding plate to move. Moreover, when the field of view is not blocked, the light-shielding plate floats on the left and right ends of the projection system, occupying a large area. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a projection field of view occupancy device and occupancy method that occupies little space, can perform full field of view occupancy, has a simple structure and can achieve high-precision control.

[0005] The technical solution adopted in this invention is as follows:

[0006] A projection field-of-view blocking device includes a housing, a main light-shielding plate, a rotating mechanism, a secondary light-shielding plate, and a translation mechanism. The housing has a projection field-of-view area, and a boss is connected to its inner top. A bearing is sleeved on the outer side of the boss. The main light-shielding plate is fan-shaped and connected to one side of the bearing. The rotating mechanism includes a rotating ring, a first coil, a first magnet, and a ball bearing seat. The rotating ring is eccentrically positioned with respect to the bearing. A connecting rod is provided between the main light-shielding plate and the rotating ring. One end of the connecting rod is hinged to the side of the main light-shielding plate away from the bearing, and the other end is connected to a circular ring. A protruding post is connected to the upper side of the rotating ring, and the circular ring is sleeved on the outer side of the protruding post. A first annular groove is provided at the bottom of the rotating ring. The top of the ball bearing seat is located in the first annular groove, and several of them are arranged in a ring. The first magnet is located on the side of the rotating ring, and several of them are arranged in a ring. The first coil is located on the outside of the rotating ring, and several of them are arranged in a ring. The translation mechanism includes a guide rail, a slider, a second coil, and a second magnet. The auxiliary light shield is rectangular, and its lower side is connected to the slider and the second magnet respectively. Several of the second magnets are arranged in the horizontal direction. The slider is slidably connected to the guide rail. Several of the second coils are arranged in the horizontal direction and are located on the lower side of the second magnet. The first coil, the ball bearing seat, the second coil, and the guide rail are all fixed inside the housing.

[0007] Preferably, it also includes a light-blocking strip, with the secondary light-blocking plate located on the upper side of the main light-blocking plate, the light-blocking strip abutting against the lower side of the secondary light-blocking plate, and a stepped shaft connected to the upper side of one end of the strip. The bottom of the secondary light-blocking plate is provided with a sliding groove, the cross-section of which is "T" shaped, and the stepped shaft is located within the sliding groove.

[0008] Preferably, the light-blocking strip is provided with a first magnetic sheet on both sides, and the main light-blocking plate is provided with a second magnetic sheet on both sides. The second magnetic sheet and the first magnetic sheet are attracted to each other through magnetic movement.

[0009] Preferably, the light-blocking strip has a shielding plate on both sides, with the two shielding plates respectively located below the two first magnetic pieces.

[0010] Preferably, the bottom of the secondary light-shielding plate is provided with an arc-shaped limiting groove, which is located on the side of the slide groove near the slider. The other end of the light-proof strip is connected to a limiting block, which is located in the arc-shaped limiting groove.

[0011] Preferably, it also includes two clamping plates symmetrically arranged on both sides of the rotating ring. The clamping plates are connected to a cylinder that drives them to move up and down. The outer side of the rotating ring is provided with a second annular groove, and the opposing sides of the two clamping plates are both arranged in the second annular groove.

[0012] Preferably, the lower side of the clamping plate is provided with a first anti-slip texture.

[0013] Preferably, the ball bearing seat includes a sleeve, a ball, and an inverted bracket with the opening facing upwards. The sleeve is located in the middle of the inverted bracket and has a spring inside. The ball is located at the top of the sleeve, and the top of the spring abuts against the ball. The lower side of the rotating ring movably abuts against the upper side of the inverted bracket.

[0014] Preferably, the upper side of the C-shaped base is provided with a second anti-slip texture.

[0015] The present invention also provides a method for blocking projection field of view using a blocking device, comprising the following steps:

[0016] S1. Place the secondary and main light-shielding plates in the initial standby position to fully expose the projection field of view.

[0017] S2. When it is necessary to block the left part of the projection field of view, the auxiliary light-blocking plate is moved along the guide rail to the right side of the projection field of view by the translation mechanism.

[0018] S3. Control the main light-shielding plate to rotate clockwise to a preset first angle through the rotating mechanism to initially block the left part of the projection field of view, so that the blocked projection field of view forms an irregular field of view shape.

[0019] S4. The auxiliary light-shielding plate is moved to the left by the translation mechanism so that the auxiliary light-shielding plate overlaps with the main light-shielding plate, thereby correcting the irregular field of view shape and achieving high-precision shading.

[0020] S5. When it is necessary to block the right part of the projection field of view, the auxiliary light-blocking plate is moved along the guide rail to the left side of the projection field of view by the translation mechanism.

[0021] S6. Control the main light shield to rotate counterclockwise to the preset second angle through the rotating mechanism to initially block the right part of the projection field of view, so that the blocked projection field of view forms an irregular field of view shape.

[0022] S7. The auxiliary light-shielding plate is moved to the right by the translation mechanism so that the auxiliary light-shielding plate overlaps with the main light-shielding plate, thereby correcting the irregular field of view shape and achieving high-precision shading.

[0023] S8. When it is necessary to completely block the projection field of view, the main light-blocking plate is controlled to rotate clockwise or counterclockwise to a preset third angle through the rotating mechanism to block the entire projection field of view.

[0024] The beneficial effects of this invention are as follows:

[0025] The projection field of view of this device can be completely exposed or completely blocked. The main light-shielding plate initially blocks the projection field of view, forming an irregular field shape. The secondary light-shielding plate then refines the irregular field shape. The movement of the main light-shielding plate and the movement of the secondary light-shielding plate are independent of each other and do not interfere with each other. The structure is simple, and the control precision requirements for the main light-shielding plate are low. The secondary light-shielding plate can be set to a smaller area, reducing space occupation and light weight, which facilitates high-precision control. Attached Figure Description

[0026] Figure 1 This is a schematic diagram showing the connection between the projection field blocking device and the projection equipment.

[0027] Figure 2 This is an exploded diagram of the projection field blocking device and the projection equipment.

[0028] Figure 3 This is a schematic diagram of the internal structure of the projection field-of-view blocking device.

[0029] Figure 4 A bottom view of the projection field-blocking device.

[0030] Figure 5 This is a first three-dimensional schematic diagram of the rotating mechanism and the main light-shielding plate.

[0031] Figure 6 This is a second three-dimensional schematic diagram of the rotating mechanism and the main light-shielding plate.

[0032] Figure 7 This is an exploded view of the rotating mechanism and the main light-shielding plate.

[0033] Figure 8 This is a schematic diagram of the ball bearing seat.

[0034] Figure 9 This is a three-dimensional schematic diagram of the translation mechanism and the secondary light-shielding plate.

[0035] Figure 10 for Figure 9 Enlarged diagram of point A in the middle.

[0036] Figure 11 for Figure 9 Enlarged diagram of point B in the middle.

[0037] Figure 12 for Figure 9 Enlarged diagram of point C in the middle.

[0038] Figure 13 A schematic diagram of the structure for splicing multiple projection field-blocking devices.

[0039] Figure 14 A flowchart of the blocking method for a projection field of view blocking device.

[0040] In the diagram: 1. Housing; 2. Main light shield; 3. Rotating mechanism; 301. Rotating ring; 302. First coil; 303. First magnet; 304. Ball bearing seat; 3041. Sleeve; 3042. Ball; 3043. C-shaped seat; 3044. Second anti-slip texture; 305. Connecting rod; 306. Ring; 307. Protruding post; 308. First annular groove; 309. Second annular groove; 4. Secondary light shield; 5. Translation mechanism. Mechanism; 501. Guide rail; 502. Slider; 503. Second coil; 504. Second magnet; 6. Projection field area; 7. Boss; 8. Bearing; 9. Anti-leakage strip; 10. Stepped shaft; 11. Slide groove; 12. First magnetic sheet; 13. Second magnetic sheet; 14. Arc-shaped limiting groove; 15. Limiting block; 16. Clamping piece; 17. Cylinder; 18. First anti-slip texture; 19. Projection equipment; 20. Shielding piece. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the 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.

[0042] Please see Figures 1-12This invention provides a technical solution: a projection field-of-view blocking device, comprising a housing 1, a main light-shielding plate 2, a rotating mechanism 3, a secondary light-shielding plate 4, and a translation mechanism 5. The housing 1 has a projection field-of-view area 6, and a boss 7 is connected to its inner top. A bearing 8 is sleeved on the outer side of the boss 7. The main light-shielding plate 2 is fan-shaped and connected to one side of the bearing 8. The rotating mechanism 3 includes a rotating ring 301, a first coil 302, a first magnet 303, and a ball bearing seat 304. The rotating ring 301 and the bearing 8 are eccentrically arranged. The projection field-of-view area 6 and the bearing 8 are respectively located on both sides of the center of the rotating ring 301. A connecting rod 305 is provided between the main light-shielding plate 2 and the rotating ring 301. One end of the connecting rod 305 is hinged to the side of the main light-shielding plate 2 away from the bearing 8, and the other end is connected to a ring 306. A boss 307 is connected to the upper side of the rotating ring 301, and the ring 306 is sleeved on the outer side of the boss 307. A second boss 306 is provided at the bottom of the rotating ring 301. A first annular groove 308 is provided. The top of the ball bearing seat 304 is located in the first annular groove 308 and several of them are arranged in a ring. The first magnet 303 is located on the side of the rotating ring 301 and several of them are arranged in a ring. The first coil 302 is located on the outside of the rotating ring 301 and several of them are arranged in a ring. The translation mechanism 5 includes a guide rail 501, a slider 502, a second coil 503 and a second magnet 504. The auxiliary light shield 4 is rectangular and its lower side is connected to the slider 502 and the second magnet 504 respectively. Several second magnets 504 are arranged in a horizontal direction. The slider 502 is slidably connected to the guide rail 501. Several second coils 503 are arranged in a horizontal direction and are located on the lower side of the second magnet 504. The first coil 302, the ball bearing seat 304, the second coil 503 and the guide rail 501 are all fixed in the housing 1. A projection device 19 for projection is provided on the outside of the housing 1.

[0043] The main light-shielding plate 2 is driven to rotate by the rotating mechanism 3 to initially block the projection field of view 6, forming an irregular field of view shape. The secondary light-shielding plate 4 is driven to move horizontally by the translation mechanism 5 to correct the irregular field of view shape and achieve high-precision blocking. The movements of the main light-shielding plate 2 and the secondary light-shielding plate 4 are independent of each other and do not interfere with each other. The structure is simple, and the control precision requirements for the main light-shielding plate 2 are low. The secondary light-shielding plate 4 is small in area and light in weight, which facilitates high-precision control and reduces space occupation.

[0044] To facilitate the prevention of light leakage and improve the accuracy of shading, this embodiment preferably includes a light-leakage-proof strip 9. The secondary light-shielding plate 4 is disposed on the upper side of the main light-shielding plate 2, and the light-leakage-proof strip 9 abuts against the lower side of the secondary light-shielding plate 4. A stepped shaft 10 is connected to the upper side of one end of the strip. The bottom of the secondary light-shielding plate 4 is provided with a sliding groove 11. The cross-section of the sliding groove 11 is T-shaped. The stepped shaft 10 is disposed in the sliding groove 11. The purpose is to fill the gap between the main light-shielding plate 2 and the secondary light-shielding plate 4 by the light-leakage-proof strip 9 to prevent light leakage. The stepped shaft 10 can rotate in the sliding groove 11 and slide along the sliding groove 11. Thus, the cooperation between the stepped shaft 10 and the sliding groove 11 allows the light-leakage-proof strip 9 to swing relative to the secondary light-shielding plate 4 and automatically adjust its position, thereby maintaining contact with the main light-shielding plate 2.

[0045] To facilitate maintaining close contact between the light-blocking strip 9 and the main light-shielding plate 2, in this embodiment, preferably, a first magnetic sheet 12 is provided on both sides of the light-blocking strip 9, and a second magnetic sheet 13 is provided on both sides of the main light-shielding plate 2. The second magnetic sheet 13 and the first magnetic sheet 12 are attracted to each other magnetically. The purpose is to ensure that the light-blocking strip 9 is always in close contact with the main light-shielding plate 2 through the magnetic attraction between the second magnetic sheet 13 and the first magnetic sheet 12. Furthermore, the light-blocking strip 9 can swing relative to the secondary light-shielding plate 4 to automatically adjust its position, avoiding displacement during movement and ensuring the blocking effect.

[0046] To further improve the light leakage prevention effect, in this embodiment, preferably, both sides of the light leakage prevention strip 9 are provided with shielding plates 20. The two shielding plates 20 are respectively disposed below the two first magnetic sheets 12. The purpose is that when the light leakage prevention strip 9 is attached to the main light shield 2, the shielding plates 20 can further cover the joint area between the first magnetic sheet 12 and the main light shield 2, prevent light leakage caused by minor misalignment during movement, enhance the sealing and reliability of the overall shielding, and ensure that the complete light shielding effect can still be maintained under complex movement conditions.

[0047] To facilitate limiting the movement range of the light-blocking strip 9, in this embodiment, preferably, the bottom of the secondary light-shielding plate 4 is provided with an arc-shaped limiting groove 14. The arc-shaped limiting groove 14 is located on the side of the slide groove 11 near the slider 502. The upper side of the other end of the light-blocking strip 9 is connected to a limiting block 15, which is located in the arc-shaped limiting groove 14. The purpose is to limit the swing angle of the light-blocking strip 9 by restricting the movement of the limiting block 15 within the arc-shaped limiting groove 14, thereby preventing the light-blocking strip 9 from deviating from the predetermined trajectory.

[0048] To improve the stability and positioning accuracy of the rotating mechanism 3, this embodiment preferably includes two clamping plates 16 symmetrically arranged on both sides of the rotating ring 301. The clamping plates 16 are connected to cylinders 17 that drive them to move up and down. The outer side of the rotating ring 301 is provided with a second annular groove 309. The opposing sides of the two clamping plates 16 are both arranged in the second annular groove 309. The purpose is to lock the rotating mechanism 3 by driving the clamping plates 16 downward to clamp the rotating ring 301 when precise positioning is required, thereby preventing the rotating mechanism 3 from moving accidentally, improving stability, and ensuring accurate positioning of the main light shield 2.

[0049] In order to improve the clamping effect and further improve the stability of the rotating mechanism 3, in this embodiment, preferably, the lower side of the clamping plate 16 is provided with a first anti-slip texture 18. The purpose is to increase the friction between the clamping plate 16 and the rotating ring 301 through the first anti-slip texture 18, prevent slippage, and ensure a firm clamping.

[0050] To facilitate smooth rotational support and increase clamping friction by forming a friction surface during locking, in this embodiment, preferably, the ball bearing seat 304 includes a sleeve 3041, a ball 3042, and an upward-facing inverted U-shaped seat 3043. The sleeve 3041 is located in the middle of the inverted seat 3043 and contains a spring (not shown in the figure). The ball 3042 is located at the top of the sleeve 3041, and the top of the spring abuts against the ball 3042. The lower side of the rotating ring 301 movably abuts against the upper side of the inverted seat 3043. The purpose is that, in the unlocked rotational state, the spring preload keeps the ball 3042 in contact with the first annular groove 308 at the bottom of the rotating ring 301. Contact ensures smooth rotation of the rotating ring 301. When locking is required, the clamping plate 16 is driven downward by the cylinder 17 to clamp the rotating ring 301. At this time, the rotating ring 301 is pressed down, pressing the ball 3042 down and compressing the spring in the sleeve 3041, so that the lower side of the rotating ring 301 is in close contact with the upper side of the shaped seat 3043, so that the upper and lower sides of the rotating ring 301 are effectively locked by friction, further preventing the rotating ring 301 from rotating in an uncommanded state. The ring 306 can rotate and slide up and down relative to the protrusion 307. When the rotating ring 301 is pressed down, the protrusion 307 slides down relative to the ring 306.

[0051] To further prevent slippage, in this embodiment, preferably, the upper side of the C-shaped base 3043 is provided with a second anti-slip texture 3044.

[0052] To facilitate the stitching and exposure of multiple projection fields of view and effectively reduce system cost and complexity, in this embodiment, preferably, multiple projection field of view blocking devices are modularly stitched together to construct a unified multi-field of view blocking system, for example, such as... Figure 13As shown, four main light-shielding plates 2 and four secondary light-shielding plates 4 can be set to block four projection fields of view. The two secondary light-shielding plates 4 can cooperate with different main light-shielding plates 2 to block different projection fields of view.

[0053] Please see Figure 14 The present invention also provides a method for blocking projection field of view using a blocking device, comprising the following steps:

[0054] S1. Place the secondary light shield 4 and the main light shield 2 in the initial standby position to fully expose the projection field of view 6.

[0055] S2. When it is necessary to block the left part of the projection field of view 6, the auxiliary light shield 4 is moved along the guide rail 501 to the right side of the projection field of view 6 by the translation mechanism 5.

[0056] S3. The main light-shielding plate 2 is controlled to rotate clockwise to a preset first angle by the rotating mechanism 3, so as to initially block the left part of the projection field area 6, so that the projection field area 6 forms an irregular field shape.

[0057] S4. The auxiliary light-shielding plate 4 is moved to the left by the translation mechanism 5, so that the auxiliary light-shielding plate 4 and the main light-shielding plate 2 are overlapped, thereby correcting the irregular field of view shape and achieving high-precision shading.

[0058] S5. When it is necessary to block the right part of the projection field of view 6, the auxiliary light shield 4 is moved along the guide rail 501 to the left side of the projection field of view 6 by the translation mechanism 5.

[0059] S6. The main light-shielding plate 2 is controlled to rotate counterclockwise to a preset second angle by the rotating mechanism 3, so as to initially block the right part of the projection field area 6, so that the projection field area 6 forms an irregular field shape.

[0060] S7. The auxiliary light-shielding plate 4 is moved to the right by the translation mechanism 5 so that the auxiliary light-shielding plate 4 overlaps with the main light-shielding plate 2, thereby correcting the irregular field of view shape and achieving high-precision shading.

[0061] S8. When it is necessary to completely block the projection field of view 6, the main light shield 2 is controlled to rotate clockwise or counterclockwise to a preset third angle by the rotating mechanism 3 to block the entire area of ​​the projection field of view 6.

[0062] The working principle and usage process of this invention: Place the secondary light shield 4 and the main light shield 2 in the initial standby position to fully expose the projection field of view 6;

[0063] When it is necessary to block the left part of the projection field of view 6, the auxiliary light-shielding plate 4 is moved along the guide rail 501 to the right side of the projection field of view 6 by the translation mechanism 5, and the main light-shielding plate 2 is rotated clockwise to a preset first angle by the rotation mechanism 3 to initially block the left part of the projection field of view 6, so that the projection field of view 6 forms an irregular field of view shape. After the main light-shielding plate 2 blocks the projection field of view 6, the clamping plate 16 is driven by the cylinder 17 to clamp the rotating ring 301 downward. At this time, the rotating ring 301 is pressed down and moves downward, pressing the ball 3042 and compressing the spring in the sleeve 3041, causing the lower side of the rotating ring 301 to move downward. The surface of the rotating ring 301 is in close contact with the upper side of the C-shaped base 3043, so that the upper and lower sides of the rotating ring 301 are effectively locked by friction, ensuring the stable positioning of the main light shield 2. The auxiliary light shield 4 is moved to the left by the translation mechanism 5, so that the auxiliary light shield 4 and the main light shield 2 are overlapped, thereby correcting the irregular field of view shape and achieving high-precision blocking. During the process of the translation mechanism 5 controlling the movement of the auxiliary light shield 4 to make the auxiliary light shield 4 and the main light shield 2 overlap, the light leakage prevention strip 9 swings relative to the auxiliary light shield 4 and is held in place by magnetic attraction at the side of the main light shield 2, thereby filling the gap between the auxiliary light shield 4 and the main light shield 2 and preventing light leakage.

[0064] When it is necessary to block the right side of the projection field of view 6, the translation mechanism 5 controls the auxiliary light-shielding plate 4 to move along the guide rail 501 to the left side of the projection field of view 6. The rotation mechanism 3 controls the main light-shielding plate 2 to rotate counterclockwise to a preset second angle, initially blocking the right side of the projection field of view 6, making the projection field of view 6 form an irregular field shape. After the main light-shielding plate 2 blocks the projection field of view 6, the cylinder 17 drives the clamping plate 16 to clamp the rotating ring 301 downward. At this time, the rotating ring 301 moves downward under pressure, pressing the ball 3042 downward and compressing the spring in the sleeve 3041, causing the lower side of the rotating ring 301 to... The surface of the rotating ring 301 is in close contact with the upper side of the C-shaped base 3043, so that the upper and lower sides of the rotating ring 301 are effectively locked by friction, ensuring the stable positioning of the main light shield 2. The secondary light shield 4 is moved to the right by the translation mechanism 5, so that the secondary light shield 4 and the main light shield 2 are overlapped, thereby correcting the irregular field of view shape and achieving high-precision blocking. During the process of the translation mechanism 5 controlling the movement of the secondary light shield 4 to make the secondary light shield 4 and the main light shield 2 overlap, the light leakage prevention strip 9 swings relative to the secondary light shield 4 and is held in place by magnetic attraction at the side of the main light shield 2, thereby filling the gap between the secondary light shield 4 and the main light shield 2 and preventing light leakage.

[0065] When it is necessary to completely block the projection field of view 6, the main light-shielding plate 2 is controlled to rotate clockwise or counterclockwise to a preset third angle by the rotating mechanism 3 to block the entire projection field of view 6. After the main light-shielding plate 2 blocks the projection field of view 6, the clamping plate 16 is driven by the cylinder 17 to clamp the rotating ring 301 downward. At this time, the rotating ring 301 is pressed down, pressing the ball 3042 to move down and compressing the spring in the sleeve 3041, so that the lower side of the rotating ring 301 is tightly abutted against the upper side of the C-shaped seat 3043, so that the upper and lower sides of the rotating ring 301 are effectively locked by friction, ensuring that the main light-shielding plate 2 is positioned stably.

[0066] The rotating mechanism 3 achieves precise rotation of the rotating ring 301 through electromagnetic drive. The first coil 302 is fixed inside the housing 1 in a ring arrangement, serving as the stator. The first magnet 303 is fixed to the side of the rotating ring 301, also in a ring arrangement, serving as the rotor. Several first magnets 303 are spaced apart with alternating N and S poles. When a control current is applied to the first coil 302, a changing magnetic field is generated. This magnetic field interacts with the permanent magnetic field of the first magnet 303. According to the Lorentz force principle, a force is generated in the tangential direction of the rotating ring 301. Electromagnetic torque is generated, thereby driving the rotating ring 301 to rotate around its center. The rotational motion of the rotating ring 301 is transmitted to the main light-shielding plate 2 through the connecting rod 305, causing the main light-shielding plate 2 to rotate around the bearing 8, thereby achieving initial shading of the projection field area 6. The ball seat 304 provides support and guidance, and the ball 3042 at its top rolls in the first annular groove 308, reducing frictional resistance and ensuring smooth and high-precision rotation. In addition, by controlling the magnitude and direction of the current of the first coil 302, the rotation angle and speed can be precisely adjusted to meet different shading requirements.

[0067] The translation mechanism 5 achieves the horizontal movement of the auxiliary light-shielding plate 4 through the linear electromagnetic drive principle. The second coil 503 is fixed inside the housing 1 and arranged horizontally as the stator. The second magnet 504 is fixed to the lower side of the auxiliary light-shielding plate 4 and arranged horizontally as the mover. Several second magnets 504 are arranged in an alternating N and S pole manner. When a control current is applied to the second coil 503, a traveling wave magnetic field or a pulse magnetic field is generated. This magnetic field interacts with the permanent magnetic field of the second magnet 504 to generate an electromagnetic thrust in the horizontal direction, driving the second magnet 504 and the auxiliary light-shielding plate 4 to move linearly along the guide rail 501. The slider 502 is slidably connected to the guide rail 501 to ensure the linearity and stability of the movement process and reduce offset and vibration. By adjusting the current phase and amplitude of the second coil 503, the moving position and speed of the auxiliary light-shielding plate 4 can be precisely controlled to achieve high-precision correction of irregular field shapes. This linear drive method has a compact structure, fast response, no mechanical contact, long life and low noise.

[0068] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A projection field stop device, characterized by: The utility model provides a projection device, including casing (1), main light shield (2), rotating mechanism (3), vice light shield (4) and translation mechanism (5), the casing (1) is equipped with projection visual field area (6) on, and its inside top is connected with the boss (7), the boss (7) is sleeved with bearing (8) outside, main light shield (2) is arranged in the fan shape, and it is connected in one side of bearing (8), rotating mechanism (3) includes rotating ring (301), first coil (302), first magnet (303) and ball seat (304), rotating ring (301) is arranged eccentric with bearing (8), and the connecting rod (305) is equipped between main light shield (2) and rotating ring (301), the connecting rod (305) one end is articulated with the side of main light shield (2) away from bearing (8), and its other end is connected with the circular ring (306), the upper side of rotating ring (301) is connected with the convex column (307), the circular ring (306) is sleeved in the convex column (307) outside, the bottom of rotating ring (301) is equipped with first annular groove (308), the top of ball seat (304) is arranged in first annular groove (308), and it is annularly arranged with several, first magnet (303) is arranged on the side of rotating ring (301), and it is annularly arranged with several, first coil (302) is arranged outside rotating ring (301), and it is annularly arranged with several, translation mechanism (5) includes guide rail (501), sliding block (502), second coil (503) and second magnet (504), vice light shield (4) is arranged in the rectangle, and its downside is connected with sliding block (502) and with second magnet (504) respectively, second magnet (504) is arranged along the horizontal direction with several, sliding block (502) is connected with guide rail (501) slidingly, second coil (503) is arranged along the horizontal direction with several, and it is arranged in the downside of second magnet (504), first coil (302), ball seat (304), second coil (503) and guide rail (501) are all fixed in the casing (1) inside.

2. The projection field stop device of claim 1, wherein: It also includes the light leakage baffle (9), vice light shield (4) is arranged in the upside of main light shield (2), the light leakage baffle (9) is abutted in the downside of vice light shield (4), and its one end upside is connected with the stepped shaft (10), the bottom of vice light shield (4) is equipped with the sliding slot (11), the section of sliding slot (11) is arranged in the '' T '' shape, the stepped shaft (10) is arranged in sliding slot (11).

3. The projection field stop device of claim 2, wherein: The both sides of light leakage baffle (9) are equipped with first magnetic sheet (12), the both sides of main light shield (2) are equipped with second magnetic sheet (13), second magnetic sheet (13) and first magnetic sheet (12) are attracted through magnetic activity.

4. The projection field stop device of claim 3, wherein: The both sides of light leakage baffle (9) are equipped with the baffle piece (20), two baffle pieces (20) are arranged below two first magnetic sheets (12) respectively.

5. The projection field stop device of claim 2, wherein: The bottom of the auxiliary light-shielding plate (4) is provided with an arc-shaped limiting groove (14), which is arranged on the side of the sliding groove (11) close to the sliding block (502). The other end of the light leakage prevention blocking strip (9) is connected with a limiting block (15) on the upper side, and the limiting block (15) is arranged in the arc-shaped limiting groove (14).

6. The projection field stop device of claim 1, wherein: Further comprising two clamping pieces (16) symmetrically arranged on both sides of the rotating ring (301), the clamping pieces (16) are connected with air cylinders (17) for driving the clamping pieces (16) to ascend and descend, and the outer side of the rotating ring (301) is provided with a second annular groove (309), and the opposite sides of the two clamping pieces (16) are arranged in the second annular groove (309).

7. The projection field stop device of claim 6, wherein: The lower side of the clamping piece (16) is provided with a first anti-skid pattern (18).

8. The projection field stop device of claim 6, wherein: The ball seat (304) comprises a sleeve (3041), a ball (3042) and a D-shaped seat (3043) with an upward opening. The sleeve (3041) is arranged in the middle of the D-shaped seat (3043), and a spring is arranged in the sleeve (3041). The ball (3042) is arranged on the top of the sleeve (3041), the top of the spring abuts against the ball (3042), and the lower side of the rotating ring (301) movably abuts against the upper side of the D-shaped seat (3043).

9. The projection field stop device of claim 8, wherein: The upper side of the D-shaped seat (3043) is provided with a second anti-skid pattern (3044).

10. A method of obscuring based on the projection field obscuring device according to any one of claims 1 to 9, characterized in that, The method comprises the following steps: S1, placing the auxiliary light-shielding plate (4) and the main light-shielding plate (2) in an initial standby position to completely expose the projection visual field area (6); S2, when it is needed to shield the left part of the projection visual field area (6), the auxiliary light-shielding plate (4) is moved to the right side of the projection visual field area (6) along the guide rail (501) through the translation mechanism (5); S3, the main light-shielding plate (2) is rotated clockwise to a preset first angle through the rotating mechanism (3) to preliminarily shield the left part of the projection visual field area (6), so that the projection visual field area (6) forms an irregular visual field shape; S4, the auxiliary light-shielding plate (4) is moved to the left through the translation mechanism (5), so that the auxiliary light-shielding plate (4) and the main light-shielding plate (2) form an overlapping state, and then the irregular visual field shape is trimmed to realize high-precision shielding; S5, when it is needed to shield the right part of the projection visual field area (6), the auxiliary light-shielding plate (4) is moved to the left side of the projection visual field area (6) along the guide rail (501) through the translation mechanism (5); S6, the main light-shielding plate (2) is rotated counterclockwise to a preset second angle through the rotating mechanism (3) to preliminarily shield the right part of the projection visual field area (6), so that the projection visual field area (6) forms an irregular visual field shape; S7, the auxiliary light-shielding plate (4) is moved to the right through the translation mechanism (5), so that the auxiliary light-shielding plate (4) and the main light-shielding plate (2) form an overlapping state, and then the irregular visual field shape is trimmed to realize high-precision shielding; S8, when the projection visual field area (6) needs to be completely blocked, the main light shield (2) is controlled to rotate clockwise or counterclockwise to a preset third angle by the rotating mechanism (3), so as to block all areas of the projection visual field area (6).

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