Polarizer switching device capable of finely adjusting angle

Abstract

The invention discloses a polarizing film switching device capable of finely adjusting an angle, and solves the problem that an existing angle modulation method can only realize imaging of a plurality of specific polarization angles or is tedious in operation. The device specifically comprises a support with a light through hole, a rotating shaft vertically arranged on the side wall of the support, a target wheel rotatably sleeving the rotating shaft, four polarization assemblies and a normal lens which are distributed on the target wheel in the circumferential direction and are the same in size, and a first driving assembly and a second driving assembly which are arranged on the support. The end face of the target wheel is parallel to the side wall of the support, and a gap is formed between the target wheel and the support. The acting end of the first driving assembly is connected with the four polarization assemblies and used for driving the four polarization assemblies to rotate at the same time. The acting end of the second driving assembly is connected with the target wheel and used for driving the target wheel to rotate so as to switch any polarization assembly or normal lens to correspond to the light passing hole.

Description

TECHNICAL FIELD

[0001] The present application relates to a polarizer switching device, in particular to a polarizer switching device with fine angle adjustment. BACKGROUND

[0002] Infrared imaging technology is an imaging technology based on the intensity characteristics of target infrared radiation, which has the characteristics of strong anti-interference and all-weather operation, and is widely used in various fields. However, when the infrared radiation intensity difference between the target and the background is small, the target and the background cannot be distinguished, and the limitation of infrared imaging technology is revealed. At this time, the polarization imaging function of the optical system is increased, and the target and the background can be enhanced due to the different polarization states. In this way, not only the infrared radiation intensity characteristics of the target scene can be obtained, but also the polarization degree and polarization angle parameters can be obtained, which increases the dimension information of the target scene and improves the infrared imaging capability.

[0003] In the design process of the traditional time-sharing infrared polarization imaging system, there are generally two methods for angle modulation: one way is to use a target wheel mechanism to carry different angle polarizers, and to select the appropriate polarizer angle by rotating the target wheel according to the actual situation during imaging. However, this scheme cannot fine-tune the polarization angle, and can only realize imaging at specific polarization angles. In actual use, fixed angles may not cover complex application requirements. The other way is to directly rotate the polarizer structure. This method has the simplest structure design, but when the target needs to be directly imaged, the removal of the polarizer requires replacing the full-transparency optical glass or relying on complex mechanical structure adjustment, which is cumbersome to operate. SUMMARY

[0004] In order to solve the technical problems that the existing angle modulation methods cannot fine-tune the polarization angle and can only realize imaging at specific polarization angles, or when the target needs to be directly imaged, the removal of the polarizer requires replacing the full-transparency optical glass or relying on complex mechanical structure adjustment, resulting in cumbersome operation, the present application provides a polarizer switching device with fine angle adjustment.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0006] A polarizer switching device with fine angle adjustment, characterized in that:

[0007] It comprises a support provided with a light hole, a rotating shaft vertically arranged on the side wall of the support, a target wheel rotatably sleeved on the rotating shaft, four polarization components of the same size distributed circumferentially on the target wheel, and a normal lens, and a first driving assembly and a second driving assembly arranged on the support.

[0008] The end face of the target wheel is parallel to the side wall of the support, and a gap is provided between the target wheel and the support.

[0009] The action end of the first driving assembly is connected with the four polarization assemblies respectively, for driving the four polarization assemblies to rotate simultaneously;

[0010] The action end of the second driving assembly is connected with the target wheel, for driving the target wheel to rotate, so as to switch any polarization assembly or normal lens corresponding to the passing light hole.

[0011] Further, the four polarization assemblies are of the same structure;

[0012] The polarization assembly comprises a polarization lens and a polarization lens frame installed on the periphery of the polarization lens;

[0013] The polarization lens frame is rotatably connected with the target wheel at one end along the axial direction, and the other end protrudes from the target wheel for connecting with the action end of the first driving assembly.

[0014] Further, the target wheel is provided with five stepped holes for installing the four polarization assemblies and one normal lens;

[0015] The stepped hole is provided with a lens frame pressing ring;

[0016] The periphery of the polarization lens frame is provided with a lens frame protruding ring around the circumferential direction;

[0017] The lens frame protruding ring is located between the stepped surface of the stepped hole and the lens frame pressing ring in the axial direction, the outer circular sidewall of the lens frame protruding ring is in clearance fit with the inner wall of the large hole of the stepped hole, a first ball ring cavity is formed between the inner wall of the large hole, the stepped surface, the outer circular sidewall of the polarization lens frame and the rear end surface of the lens frame protruding ring, and a second ball ring cavity is formed between the inner wall of the large hole, the front end surface of the lens frame protruding ring, the outer circular sidewall of the polarization lens frame and the lens frame pressing ring; the rear end surface is the end surface close to the support; and the front end surface is the end surface away from the support;

[0018] A plurality of first balls are arranged in the first ball ring cavity;

[0019] A plurality of second balls are arranged in the second ball ring cavity;

[0020] The normal lens is pressed and installed in the corresponding stepped hole through the corresponding lens frame pressing ring.

[0021] Further, the periphery of the polarization lens frame is further sleeved with a lubricating copper gasket;

[0022] The lubricating copper gasket is located between the lens frame pressing ring and the plurality of second balls, the outer circle of the lubricating copper gasket is in clearance fit with the inner wall of the large hole of the stepped hole, and the inner circle of the lubricating copper gasket is in clearance fit with the outer circular sidewall of the polarization lens frame.

[0023] Further, the first driving assembly comprises a first motor support installed on the target wheel, a first driving motor installed on the first motor support, and a first driving gear fixedly installed on an acting end of the first driving motor.

[0024] Another end of each of the polarizer frame is provided with a frame gear ring on the outer wall.

[0025] The first driving gear is located at the center of the target wheel, coaxially arranged with the target wheel, and engaged with the four frame gear rings, and gaps are formed between the rear end surface of the first driving gear and the front end surface of the target wheel and the rotating shaft.

[0026] Further, the first motor support comprises a mounting ring and at least two L-shaped legs arranged on the outer wall of the mounting ring.

[0027] The first driving motor is installed on the mounting ring.

[0028] One end of the L-shaped leg is connected with the mounting ring, and the other end is bent towards the target wheel and detachably connected with the target wheel.

[0029] Further, the second driving assembly comprises a second motor support arranged on the support, a second driving motor installed on the second motor support, and a second driving gear fixedly installed on an acting end of the second driving motor.

[0030] The outer wall of the target wheel is provided with a target wheel gear ring.

[0031] The second driving gear is engaged with the target wheel gear ring.

[0032] Further, the rotating shaft is a bolt, one end of the shank section of the bolt is threadedly connected with the support.

[0033] The target wheel is rotatably sleeved on the head of the bolt and the other end of the shank section.

[0034] The inner wall of the central hole of the target wheel is provided with a target wheel protruding ring around the circumference thereof.

[0035] The target wheel protruding ring is located between the head and the support in the axial direction, forming a third ball ring cavity between the inner wall of the target wheel, the rear end surface of the head, the outer wall of the shank, and the front end surface of the target wheel protruding ring, and a fourth ball ring cavity between the inner wall of the target wheel, the rear end surface of the target wheel protruding ring, the outer wall of the shank, and the support.

[0036] A plurality of third balls are arranged in the third ball ring cavity.

[0037] A plurality of fourth balls are arranged in the fourth ball ring cavity.

[0038] Further, the rear end surface of the target wheel is provided with an annular protrusion coaxial therewith at the center thereof.

[0039] The target wheel convex ring is arranged on the inner wall of the annular convexity;

[0040] The target wheel, the target wheel tooth ring, the target wheel convex ring and the annular convexity are integrally arranged;

[0041] The polarizer frame, the mirror frame convex ring and the mirror frame tooth ring are integrally arranged.

[0042] Further, a limiting stopper is arranged on the front end surface of the target wheel;

[0043] The support is further provided with a clockwise limiting assembly and an anticlockwise limiting assembly;

[0044] The clockwise limiting assembly comprises a clockwise limiting support which is detachably connected to the support at one end and extends to the front end surface of the target wheel at the other end, and a clockwise limiting switch which is arranged on the other end of the clockwise limiting support and located on the rotating path of the limiting stopper;

[0045] The anticlockwise limiting assembly comprises an anticlockwise limiting support which is detachably connected to the support at one end and extends to the front end surface of the target wheel at the other end, and an anticlockwise limiting switch which is arranged on the other end of the anticlockwise limiting support and located on the rotating path of the limiting stopper.

[0046] The beneficial effects of the present application are:

[0047] 1. The polarizer switching device with adjustable angle provided by the present application not only is provided with the second driving assembly capable of driving the target wheel to rotate to switch different polarization states, but also is provided with the first driving assembly capable of driving each polarization component to spin, so as to solve the problem that the polarizer lens cannot complete the spin adjustment of the polarization angle in the time-sharing polarization imaging system, so that the fixed polarization state quick switching and the polarization angle fine adjustment can be satisfied at the same time, and when the fine adjustment is required, the polarizer lens does not need to be disassembled, and the operation is convenient and simple.

[0048] 2. The polarizer switching device with adjustable angle provided by the present application, four polarization components are rotatably connected with the target wheel through the respective polarizer frames, and the acting end of the first driving assembly is connected with the polarizer frame, so that the first driving assembly can drive the independent spin of each polarizer frame, and the angle fine adjustment function of each polarizer lens is realized.

[0049] 3. The polarizer switching device with angle fine adjustment provided by the application makes the other end of the polarizer frame protrude from the target wheel, and sets a frame tooth ring on the periphery of the polarizer frame, installs a first driving motor on a first motor support installed on a support, drives a first driving gear through the first driving motor, and further drives the polarizer frame engaged with the first driving gear, and further drives each polarizer piece, so as to realize angle fine adjustment of each polarizer piece without affecting the rotation of the target wheel, and the device has compact structure and is easy to realize, beneficial to system integration, easy to maintain and replace, and improves the replaceability and reliability of the product.

[0050] 4. The polarizer switching device with angle fine adjustment provided by the application sets an installation ring for installing the first driving motor on the first motor support, and sets at least two L-shaped legs outside the installation ring, which support the installation ring and leave a free rotation space for the target wheel, and the structure design is compact and ingenious.

[0051] 5. The polarizer switching device with angle fine adjustment provided by the application sets a frame convex ring on the polarizer frame, which can stabilize the polarizer frame, and form a first ball ring cavity and a second ball ring cavity for installing first and second balls, so as to enable each polarization component to be switched in a smooth and stable manner.

[0052] 6. The polarizer switching device with angle fine adjustment provided by the application sets a target wheel convex ring on the inner wall of the target wheel, which can stabilize the target wheel, and form a third ball ring cavity and a fourth ball ring cavity for installing third and fourth balls, so as to enable the target wheel to rotate in a smooth and stable manner.

[0053] 7. The polarizer switching device with angle fine adjustment provided by the application integrally sets the target wheel, the target wheel tooth ring, the target wheel convex ring and the annular protrusion, and integrally sets the polarizer frame and the frame tooth ring, which can reduce rotation error and improve the accuracy of polarization state fine adjustment.

[0054] 8. The polarizer switching device with angle fine adjustment provided by the application further sets a clockwise limiting component and a counterclockwise limiting component on the support, which can limit the clockwise rotation zero position and the counterclockwise rotation zero position of the target wheel, and facilitate quick zero setting. DETAILED DESCRIPTION

[0055] Figure 1 is a structural schematic view of an embodiment of the polarizer switching device with angle fine adjustment provided by the application;

[0056] Figure 2 is a partial sectional view of Figure 1 ;

[0057] Figure 3is a structural schematic view of the polarization assembly in the embodiment of the present application;

[0058] Figure 4 is Figure 3 an A-A cross-sectional view of

[0059] Figure 5 is Figure 1 a partial another cross-sectional view of

[0060] Figure 6 is a structural schematic view of the target wheel in the embodiment of the present application;

[0061] Figure 7 is Figure 6 an A-A cross-sectional view of

[0062] Reference signs:

[0063] 1 - support, 2 - rotating shaft, 3 - target wheel, 31 - stepped hole, 311 - stepped surface, 312 - large hole, 32 - first ball, 33 - second ball, 34 - target wheel tooth ring, 35 - target wheel convex ring, 36 - third ball, 37 - fourth ball, 38 - annular protrusion, 4 - polarization assembly, 41 - polarization lens, 42 - polarization lens frame, 421 - lens frame convex ring, 422 - lens frame tooth ring, 43 - lens frame pressing ring, 44 - lubricating copper gasket, 5 - normal lens, 6 - first driving assembly, 61 - first motor support, 611 - mounting ring, 612 - L-shaped leg, 62 - first driving motor, 63 - first driving gear, 7 - second driving assembly, 71 - second motor support, 72 - second driving motor, 73 - second driving gear, 8 - clockwise limiting assembly, 81 - clockwise limiting support, 82 - clockwise limiting switch, 9 - counterclockwise limiting assembly, 91 - counterclockwise limiting support, 92 - counterclockwise limiting switch, 10 - limiting stopper. DETAILED DESCRIPTION

[0064] The technical solutions of the present application will be described clearly and completely in combination with the drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0065] The polarization lens switching device provided by the embodiment of the present application can be finely adjusted in angle, as shown in Figure 1 , comprising a support 1 provided with a light passing hole, a rotating shaft 2 vertically arranged on the side wall of the support 1, a target wheel 3 rotatably sleeved on the rotating shaft 2, four polarization assemblies 4 and a normal lens 5 which are uniformly distributed around the circumference of the target wheel 3 and have the same size, and a first driving assembly 6, a second driving assembly 7, a clockwise limiting assembly 8 and a counterclockwise limiting assembly 9 arranged on the support 1.

[0066] Firstly, in this embodiment, the front end surface is defined as the end surface away from the support 1, and the rear end surface is defined as the end surface close to the support 1.

[0067] As shown in Figure 1 and Figure 2 , the rotating shaft 2 is a bolt, one end of the shank section of the bolt is threadedly connected with the support 1; as shown in Figure 1 , Figure 6 , Figure 7 and Figure 2 , the target wheel 3 is rotatably sleeved outside the head section of the bolt and the other end of the shank section of the bolt; the end surface of the target wheel 3 is parallel to the side wall of the support 1, and a gap is provided between the target wheel 3 and the support 1; the target wheel 3 is provided with five stepped holes 31 for mounting the polarization assembly 4 and a normal lens 5; each stepped hole 31 is provided with a lens frame pressing ring 43, and the normal lens 5 is pressed and mounted in the corresponding stepped hole 31 by the corresponding lens frame pressing ring 43; the outer side wall of the target wheel 3 is provided with a target wheel gear ring 34; the center of the rear end surface of the target wheel 3 is provided with a coaxial annular protrusion 38; the inner wall of the annular protrusion 38 is provided with a target wheel convex ring 35 around the circumference thereof; as shown in Figure 2 , the target wheel convex ring 35 is located between the head section of the bolt and the support 1 in the axial direction thereof, and a third ball ring cavity is formed between the inner wall of the target wheel 3, the rear end surface of the head section of the bolt, the outer wall of the shank section of the bolt and the front end surface of the target wheel convex ring 35, and a fourth ball ring cavity is formed between the inner wall of the target wheel 3, the rear end surface of the target wheel convex ring 35, the outer wall of the shank section of the bolt and the support 1; a plurality of third balls 36 are arranged in the third ball ring cavity; a plurality of fourth balls 37 are arranged in the fourth ball ring cavity, and the third balls 36 and the fourth balls 37 can ensure the smooth rotation of the target wheel 3. In addition, the front end surface of the target wheel 3 is further provided with a limiting stopper 10,

[0068] In this embodiment, the target wheel 3, the target wheel gear ring 34, the target wheel convex ring 35 and the annular protrusion 38 are integrally arranged. In addition, the target wheel 3 is further provided with a scale line, which facilitates the assembly and ensures that the polarization lens can obtain a standard polarization angle when rotated to the optical path.

[0069] The four polarization assemblies 4 have the same structure; the structure of each polarization assembly 4 is as follows:

[0070] As shown in Figure 1 , Figure 3 , Figure 4 and Figure 5As shown, the polarization assembly 4 comprises a polarizing lens 41 and a polarizing lens frame 42 mounted on the periphery of the polarizing lens 41; the polarizing lens frame 42 is rotatably connected to the target wheel 3 at one end of its axial direction, and protrudes from the target wheel 3 at the other end; a lens frame tooth ring 422 is arranged on the outer side wall of the other end of the polarizing lens frame 42; a lens frame convex ring 421 is arranged on the periphery of the middle part of the polarizing lens frame 42 in the circumferential direction; the lens frame convex ring 421 is located between the stepped surface 311 of the stepped hole 31 and the lens frame pressing ring 43 in the axial direction, the outer circular side wall of the lens frame convex ring 421 is in clearance fit with the inner wall of the large hole 312 of the stepped hole 31, and the first ball ring cavity is formed between the inner wall of the large hole 312, the stepped surface 311, the outer circular side wall of the polarizing lens frame 42 and the rear end surface of the lens frame convex ring 421, and the second ball ring cavity is formed between the inner wall of the large hole 312, the front end surface of the lens frame convex ring 421, the outer circular side wall of the polarizing lens frame 42 and the lens frame pressing ring 43; a plurality of first balls 32 are arranged in the first ball ring cavity; a plurality of second balls 33 are arranged in the second ball ring cavity. A lubricating copper gasket 44 is further sleeved on the periphery of the polarizing lens frame 42; the lubricating copper gasket 44 is located between the lens frame pressing ring 43 and the plurality of second balls 33, and the outer circle thereof is in clearance fit with the inner wall of the large hole 312 of the stepped hole 31, and the inner circle thereof is in clearance fit with the outer circular side wall of the polarizing lens frame 42. A scale line is further arranged on the front end surface of the polarizing lens frame 42 to mark the polarization angle of the polarizing lens 41; the normal lens 5 is a full transparent lens.

[0071] In this embodiment, the polarizing lens frame 42, the lens frame convex ring 421 and the lens frame tooth ring 422 are integrally arranged. The polarization angles of the four polarizing lenses 41 are 0°, 45°, 90° and 135° respectively; the first balls 32, the second balls 33, the third balls 36 and the fourth balls 37 are all 1mm steel balls.

[0072] In combination Figure 1 and Figure 2 As shown, the first driving assembly 6 is used to drive the four polarization assemblies 4 to rotate simultaneously by ±15°; the first driving assembly 6 comprises a first motor support 61 mounted on the target wheel 3, a first driving motor 62 mounted on the first motor support 61, and a first driving gear 63 fixedly mounted on the acting end of the first driving motor 62; the first driving gear 63 is located at the center of the target wheel 3 and coaxially arranged with the target wheel 3, and engages with the four lens frame tooth rings 422; at the same time, the rear end surface of the first driving gear 63 is provided with a gap between the target wheel 3 and the front end surface of the rotating shaft 2, so that the polarization state switching does not affect the rotation of the polarization assembly 4. The first motor support 61 comprises a mounting ring 611 and three L-shaped legs 612 arranged on the outer wall of the mounting ring 611; the first driving motor 62 is mounted on the mounting ring 611; one end of the L-shaped leg 612 is connected with the mounting ring 611, and the other end is bent towards the target wheel 3 and detachably connected with the target wheel 3.

[0073] As Figure 1The second driving assembly 7 is used to drive the target wheel 3 to rotate, so as to switch any polarized component 4 or normal lens 5 to correspond to the passing light hole on the support 1, and realize the switching of the polarization state. The second driving assembly 7 comprises a second motor support 71 arranged on the support, a second driving motor 72 mounted on the second motor support 71, and a second driving gear 73 fixedly mounted on the action end of the second driving motor 72. The second driving gear 73 is engaged with the target wheel gear ring 34.

[0074] In the embodiment, the first driving gear 63 and the second driving gear 73 are both pinions with a module of 0.2, so as to ensure the adjustment accuracy of the polarized plate and the accuracy of the initial position. If the polarized lens is self-rotated by a certain angle and then the polarization state is switched, the control system is self-rotated to the home position in advance.

[0075] The clockwise limiting assembly 8 comprises a clockwise limiting support 81 which is detachably connected to the support 1 at one end and extends to the front end face of the target wheel 3 at the other end, and a clockwise limiting switch 82 arranged on the other end of the clockwise limiting support 81 and located on the rotation path of the limiting block 10, for clockwise zero-limiting.

[0076] The counterclockwise limiting assembly 9 comprises a counterclockwise limiting support 91 which is detachably connected to the support 1 at one end and extends to the front end face of the target wheel 3 at the other end, and a counterclockwise limiting switch 92 arranged on the other end of the counterclockwise limiting support 91 and located on the rotation path of the limiting block 10, for counterclockwise zero-limiting.

[0077] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any change or replacement within the technical scope disclosed in the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A polarizer switching device capable of fine angle adjustment, characterized in that: it comprises a support (1) provided with a light passing hole, a rotating shaft (2) vertically arranged on the side wall of the support (1), a target wheel (3) rotatably sleeved on the rotating shaft (2), four polarizing assemblies (4) of the same size distributed around the target wheel (3), and a normal lens (5), and a first driving assembly (6) and a second driving assembly (7) arranged on the support (1); the end surface of the target wheel (3) is parallel to the side wall (1) of the support, and a gap is provided between the target wheel (3) and the support (1); the acting end of the first driving assembly (6) is connected with the four polarizing assemblies (4) respectively, for driving the four polarizing assemblies (4) to rotate simultaneously; the acting end of the second driving assembly (7) is connected with the target wheel (3), for driving the target wheel (3) to rotate, so as to switch any polarizing assembly (4) or the normal lens (5) corresponding to the passing light hole.

2. The polarizer switching device capable of fine angle adjustment according to claim 1, characterized in that: the four polarizing assemblies (4) are of the same structure; the polarizing assembly (4) comprises a polarizing lens (41) and a polarizing lens frame (42) mounted on the periphery of the polarizing lens (41); the polarizing lens frame (42) is rotatably connected with the target wheel (3) at one end along the axial direction, and the other end protrudes from the target wheel (3) for connecting with the acting end of the first driving assembly (6).

3. The polarizer switching device capable of fine angle adjustment according to claim 2, characterized in that: the target wheel (3) is provided with five stepped holes (31) for mounting the four polarizing assemblies (4) and the normal lens (5); the stepped hole (31) is provided with a lens frame pressing ring (43); the periphery of the polarizing lens frame (42) is provided with a lens frame protruding ring (421) around the circumferential direction; the lens frame protruding ring (421) is located between the stepped surface (311) of the stepped hole (31) and the lens frame pressing ring (43) in the axial direction, the outer circular side wall of the lens frame protruding ring (421) is in clearance fit with the inner wall of the large hole (312) of the stepped hole (31), a first ball ring cavity is formed between the inner wall of the large hole (312), the stepped surface (311), the outer circular side wall of the polarizing lens frame (42) and the rear end surface of the lens frame protruding ring (421), and a second ball ring cavity is formed between the inner wall of the large hole (312), the front end surface of the lens frame protruding ring (421), the outer circular side wall of the polarizing lens frame (42) and the lens frame pressing ring (43); the rear end surface is the end surface close to the support (1); the front end surface is the end surface away from the support (1); a plurality of first balls (32) are arranged in the first ball ring cavity; a plurality of second balls (33) are arranged in the second ball ring cavity; the normal lens (5) is press-fitted in the corresponding stepped hole (31) through the corresponding lens frame pressing ring (43).

4. The polarizer switching device capable of fine angle adjustment according to claim 3, characterized in that: a lubricating copper gasket (44) is further sleeved on the periphery of the polarizing lens frame (42). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The lubricating copper gasket (44) is located between the mirror frame pressing ring (43) and the plurality of second rolling balls (33), the outer ring is in clearance fit with the inner wall of the large hole (312) of the stepped hole (31), and the inner ring is in clearance fit with the outer circular sidewall of the polarizing mirror frame (42).

5. The angle-tunable polarizer switching device according to claim 3 or 4, characterized in that: The first driving assembly (6) comprises a first motor support (61) mounted on the target wheel (3), a first driving motor (62) mounted on the first motor support (61), and a first driving gear (63) fixedly mounted on the acting end of the first driving motor (62); The other end of each polarizing mirror frame (42) is provided with a mirror frame tooth ring (422) on the outer sidewall; The first driving gear (63) is located at the center of the target wheel (3) and coaxially arranged with the target wheel (3), and meshes with the four mirror frame tooth rings (422), and the rear end face of the first driving gear (63) is provided with a gap between the front end face of the target wheel (3) and the rotating shaft (2).

6. The angle-tuneable polariser switching device according to claim 5, characterised in that: The first motor support (61) comprises a mounting ring (611) and at least two L-shaped legs (612) arranged on the outer wall of the mounting ring (611); The first driving motor (62) is mounted on the mounting ring (611); One end of the L-shaped leg (612) is connected with the mounting ring (611), and the other end is bent towards the target wheel (3) and detachably connected with the target wheel (3).

7. The angle-tunable polarizer switching device according to claim 6, characterized in that: The second driving assembly (7) comprises a second motor support (71) arranged on the support (1), a second driving motor (72) mounted on the second motor support (71), and a second driving gear (73) fixedly mounted on the acting end of the second driving motor (72); The outer sidewall of the target wheel (3) is provided with a target wheel tooth ring (34); The second driving gear (73) meshes with the target wheel tooth ring (34).

8. The angle-tunable polarizer switching device according to claim 7, characterized in that: The rotating shaft (2) adopts a bolt, one end of the shank section of the bolt is threadedly connected with the support (1); The target wheel (3) is rotatably sleeved on the shank of the bolt and the other end of the shank section; The target wheel (3) is provided with a target wheel protruding ring (35) on the inner wall of the middle hole in the circumferential direction; The target wheel protruding ring (35) is located between the shank and the support (1) in the axial direction, and a third rolling ball ring cavity is formed between the inner wall of the target wheel (3), the rear end face of the shank, the outer wall of the shank section and the front end face of the target wheel protruding ring (35), and a fourth rolling ball ring cavity is formed between the inner wall of the target wheel (3), the rear end face of the target wheel protruding ring (35), the outer wall of the shank section and the support (1); A plurality of third rolling balls (36) are arranged in the third rolling ball ring cavity; A plurality of fourth rolling balls (37) are arranged in the fourth rolling ball ring cavity.

9. The angle-tunable polarizer switching device according to claim 8, characterized in that: The rear end face of the target wheel (3) is provided with an annular protrusion (38) coaxial with it; The target wheel convex ring (35) is arranged on the inner wall of the annular convex (38); The target wheel (3), the target wheel tooth ring (34), the target wheel convex ring (35) and the annular convex (38) are arranged integrally; The polarizer frame (42), the mirror frame convex ring (421) and the mirror frame tooth ring (422) are arranged integrally.

10. The angle-adjustable polarizer switching device according to claim 9, characterized in that: A limiting block (10) is arranged on the front end surface of the target wheel (3); The support (1) is further provided with a clockwise limiting assembly (8) and an anticlockwise limiting assembly (9); The clockwise limiting assembly (8) comprises a clockwise limiting support (81) which is detachably connected to the support (1) at one end and extends to the front end surface of the target wheel (3) at the other end, and a clockwise limiting switch (82) which is arranged on the other end of the clockwise limiting support (81) and located on the rotating path of the limiting block (10); The anticlockwise limiting assembly (9) comprises an anticlockwise limiting support (91) which is detachably connected to the support (1) at one end and extends to the front end surface of the target wheel (3) at the other end, and an anticlockwise limiting switch (92) which is arranged on the other end of the anticlockwise limiting support (91) and located on the rotating path of the limiting block (10).

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