An optical adjustment platform for dual-axis concentric rotation adjustment

Abstract

This utility model discloses an optical adjustment platform for dual-axis concentric rotation adjustment, including a base, a dual-axis mounting base, and a mirror mount with an optical mirror. The dual-axis mounting base is hinged to the base to form a first axis, and the mirror mount is hinged to the dual-axis mounting base to form a second axis. The first axis and the second axis intersect perpendicularly. The dual-axis mounting base is equipped with a first angular adjustment unit that drives it to swing about the first axis relative to the base. The optical mirror is equipped with a second angular adjustment unit that drives it to rotate about the second axis relative to the dual-axis mounting base. Both the first and second angular adjustment units are independently mounted on the dual-axis mounting base. This achieves optical mirror angle adjustment that is "high-resolution, offset-free, compact in structure, and small in size."

Description

Technical Field

[0001] This utility model relates to the technical field of optical adjustment frame structure, and in particular to an optical adjustment platform for dual-axis concentric rotation adjustment. Background Technology

[0002] In optical systems, the angle adjustment accuracy of optical mirrors (such as mirrors, prisms, etc.) directly affects the stability of the optical path and the reliability of experimental results. Traditional optical adjustment frames generally adopt a "dual-endpoint eccentric adjustment structure," such as the support structure described in patent "CN223123288 U An Optical Adjustment Frame." Its working principle is as follows: two independent adjustment components act on two azimuth endpoints of the optical mirror (lower end and right end, or upper end and left end). During adjustment, the two endpoints drive the optical mirror to rotate around an external eccentric fulcrum (not the center of the optical mirror), thereby changing the tilt angle of the optical mirror.

[0003] Traditional adjustment frames have the following drawbacks: 1) Optical center offset: Since the adjustment point is located at the end of the optical mirror and rotates around the eccentric point, the geometric center of the optical mirror will shift laterally or longitudinally during the adjustment process, resulting in the optical path axis shifting. Repeated calibration is required, which reduces the adjustment efficiency.

[0004] 2) Low adjustment accuracy: The eccentric adjustment at both ends is a non-fixed-axis motion. The adjustment angle and the operation amount are non-linear, which easily generates cumulative errors. It is especially difficult to accurately control the angle change during fine adjustment.

[0005] 3) Poor structural stability: The end-point driven method may cause the adjustment components to loosen due to stress accumulation after long-term use, affecting the stability of the optical path.

[0006] 4) Complex operation: It is necessary to coordinate the adjustment of the two endpoints at the same time to avoid over-adjustment that may cause the optical lens to jam or be damaged, which requires a high level of operator proficiency.

[0007] To address the aforementioned issues, this invention proposes an optical adjustment frame based on "dual-axis fixed-axis adjustment," which achieves high-precision, offset-free angle adjustment of the optical mirror through innovative structural design. Utility Model Content

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide an optical adjustment frame that achieves fixed-axis adjustment through two perpendicular intersecting axes, which has the characteristics of high angle adjustment accuracy and convenient operation.

[0009] To achieve the above objectives, this utility model provides an optical adjustment platform for dual-axis concentric rotation adjustment, comprising a base, a dual-axis mounting base, and a mirror mount with an optical lens. The dual-axis mounting base is hinged to the base to form a first axis, and the mirror mount is hinged to the dual-axis mounting base to form a second axis. The first axis and the second axis intersect perpendicularly. The dual-axis mounting base is equipped with a first angular adjustment unit that drives it to swing about the first axis relative to the base. The optical lens is equipped with a second angular adjustment unit that drives it to rotate about the second axis relative to the dual-axis mounting base. Both the first and second angular adjustment units are independently mounted on the dual-axis mounting base.

[0010] Furthermore, the first axis and the second axis intersect perpendicularly at the center point C of the optical mirror.

[0011] Furthermore, a connecting shaft extending along the first axis is fixed on the base, and the dual-axis mounting base is hinged to the connecting shaft. The dual-axis mounting base is provided with at least one support portion that is slidably connected in a direction parallel to the first axis, and the bottom of the support portion is elastically in contact with the base.

[0012] Furthermore, the bottom of the support is provided with ball bearings for rolling contact with the base, and the upper part of the support is fitted with a compression spring, with the two ends of the compression spring acting on the support and the dual-axis mounting base respectively.

[0013] Furthermore, the first angular adjustment unit includes a first drive unit, a rocker arm shaft, and a rocker arm. The rocker arm shaft is fixedly connected to the output end of the first drive unit along a direction parallel to the first axis, and rotates around its own axis under the drive of the first drive unit. The rocker arm is rigidly connected to the rocker arm shaft along the radial direction, and swings synchronously with the rotation of the rocker arm shaft. A fixed rod is fixedly provided on the base, and the fixed rod and the rocker arm form a contact fit, so that the fixed rod and the rocker arm together form a lever transmission pair to realize the transmission of angular displacement. A backlash spring that provides continuous preload is assembled between the base and the dual-axis mounting seat to ensure that the fixed rod and the rocker arm are always in contact during the movement and do not disengage.

[0014] Furthermore, the base is fixedly provided with a first spring connecting rod for connecting one end of the hysteresis spring, and the dual-axis mounting base is fixedly provided with a second spring connecting rod for connecting the other end of the hysteresis spring.

[0015] Furthermore, the second angular adjustment unit includes a second driving unit, and the mirror mount is fixed to the output end of the second driving unit, causing the mirror mount to rotate around the second axis under the drive of the second driving unit.

[0016] Furthermore, a preload torsion spring that provides continuous preload force is assembled between the dual-axis mounting base and the mirror base, wherein the two ends of the preload torsion spring respectively engage with the dual-axis mounting base and the mirror base.

[0017] Furthermore, one end of the pre-tensioned torsion spring is provided with a ball that makes rolling contact with the mirror base.

[0018] The utility model adopts the above-mentioned solution, and its beneficial effects are as follows: 1) The optical mirror rotates around a second axis passing through its own center and swings around a first axis perpendicular to the second axis. During the adjustment, the center offset is negligible, which fundamentally eliminates the optical path offset problem of traditional adjustment; 2) The angle change is linearly related to the operation amount through the dual-axis fixed-axis transmission, which effectively improves the adjustment accuracy. Therefore, the optical adjustment frame of this utility model solves the core defects of the traditional optical adjustment frame and realizes the optical mirror angle adjustment of "high resolution, no offset, compact structure and small size". Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the optical adjustment frame for an embodiment.

[0020] Figure 2-3 This is a schematic diagram of the optical adjustment frame in an embodiment.

[0021] Figure 4 for Figure 3 The sectional view of EE in the image.

[0022] Figure 5-6 This is a schematic diagram of the optical adjustment frame in an embodiment.

[0023] Figure 7 for Figure 6 The sectional view of FF in the image.

[0024] Figure 8 This is a schematic diagram of the base for an embodiment.

[0025] Figure 9 This is a schematic diagram of a dual-axis mounting base as an example.

[0026] Among them, 1-base, 13-coupling, 14-support, 141-ball bearing, 142-compression spring, 2-dual-axis mounting base, 21-stop bar, 22-preload torsion spring, 213-optical mirror, 31-mirror mount, a-first axis, b-second axis, 4-first angle adjustment unit, 41-first drive unit, 42-rocker arm shaft, 43-rocker arm, 44-fixed rod, 45-return spring, 451-first spring connecting rod, 452-second spring connecting rod, 5-second angle adjustment unit, 51-second drive unit. Detailed Implementation

[0027] To more fully illustrate this utility model, a detailed description will be provided below in conjunction with the accompanying drawings. The drawings depict preferred embodiments of this utility model. However, it is worth noting that this utility model is not limited to these specific forms and can be implemented in various ways. These embodiments are provided to enable the reader to gain a deeper understanding of this utility model.

[0028] See appendix Figure 1-9 As shown in this embodiment, an optical adjustment platform for dual-axis concentric rotation adjustment includes a base 1, a dual-axis mounting base 2, and a mirror mount 31 with an optical lens 3. The base 1 serves as the mounting foundation for the entire optical adjustment frame and the supporting carrier for the dual-axis mounting base 2. It can be installed on a chassis or other equipment. Its fixing method can achieve a stable connection through bolt fixing or welding, etc. No specific limitation is made here, and the installation method can be selected as needed.

[0029] In this embodiment, the dual-axis mounting base 2 serves as an intermediate component connecting the base 1 and the lens mount 31. It is connected to the base 1 via a hinge structure, allowing the optical lens 3 and the lens mount 31 to be flexibly adjusted synchronously within a certain angle range along with the dual-axis mounting base 2. Specifically, the dual-axis mounting base 2 and the base 1 are hinged together to form a first axis a. A connecting shaft 13 extending along the first axis a is fixed on the base 1. The dual-axis mounting base 2 is hinged to the connecting shaft 13 via a bushing, thereby realizing the synchronous rotational adjustment function of the dual-axis mounting base 2, the lens mount 31, and the optical lens 3 around the first axis a. At the same time, the dual-axis mounting base 2 serves as a carrier for the optical lens 3 and the lens mount 31, providing a stable support foundation for the optical lens 3 and ensuring that the optical lens 3 remains stable during adjustment.

[0030] Furthermore, to improve the stability of the dual-axis mounting base 2 relative to the base 1 during rotational adjustment, the dual-axis mounting base 2 in this embodiment is provided with at least one support portion 14 that is slidably connected along a direction parallel to the first axis a. Preferably, two support portions 14 are used. Specifically, the dual-axis mounting base 2 in this embodiment has two limiting sliding holes extending along a direction parallel to the first axis a. The two limiting sliding holes allow the two support portions 14 to slide one-to-one, thereby allowing the support portion 14 to slide axially relative to the limiting sliding hole and rotate axially around the limiting sliding hole. Secondly, the bottom of the support portion 14 is elastically engaged with the base 1. The engagement between the support portion 14 and the base 1 provides elastic support, thereby improving the stability of the dual-axis mounting base 2 during rotation. In addition, the bottom of the support part 14 is provided with a ball bearing 141 for rolling contact with the base 1, which reduces the friction between the support part 14 and the base 1, making the rotation adjustment of the dual-axis mounting seat 2 smoother; the upper part of the support part 14 is fitted with a compression spring 142, and the two ends of the compression spring 142 act on the lower part of the support part 14 and the bottom surface of the dual-axis mounting seat 2 respectively, so that the bottom of the support part 14 (equivalent to the ball bearing 141) always elastically presses the base 1, reducing the gap and fluctuation during the rotation adjustment process; in this embodiment, the connecting shaft 13 and the two support parts 14 are arranged in a triangular manner, which in particular ensures that when the dual-axis mounting seat 2 swings around the first axis a, the two support parts 14 are always in contact with the base 1, avoiding tilting caused by the "single point suspension" of the connecting shaft 13, thereby effectively improving stability.

[0031] In this embodiment, the lens mount 31 is hinged to the dual-axis mounting base 2 to form a second axis b. The lens mount 31 is hinged to the dual-axis mounting base 2 via a rotating shaft extending along the second axis b, allowing the lens mount 31 and the optical lens 3 to be independently rotated and adjusted around the second axis b on the dual-axis mounting base 2. Furthermore, the lens mount 31 can be designed with a suitable mounting groove or snap-fit ​​structure according to the shape and structural characteristics of the optical lens 3 to ensure that the optical lens 3 is securely installed and easy to disassemble and maintain. No specific limitations are made here; those skilled in the art can design flexibly according to actual needs.

[0032] In this embodiment, the second axis b is the rotation axis of the optical mirror 3. The second axis b passes through the center point C of the optical mirror 3 along the reflecting surface, ensuring that the optical mirror 3 rotates around its own central axis and avoiding center offset during rotation.

[0033] In this embodiment, the first axis a is the swing axis of the dual-axis mounting base 2, extending in a direction perpendicular to the second axis b, and the first axis a intersects the second axis b perpendicularly. The intersection point of the two is located at the geometric center point C of the optical mirror 3, thereby realizing dual-axis coordinated adjustment with the center of the optical mirror 3 as the common rotation origin, ensuring that the rotation and swing of the optical mirror 3 are fixed-axis movements during the adjustment process, and improving the stability and accuracy of the optical mirror 3 during the adjustment process.

[0034] In this embodiment, the dual-axis mounting base 2 is equipped with a first angular position adjustment unit 4 that drives it to swing about a fixed axis a relative to the base 1, and the optical mirror 3 is equipped with a second angular position adjustment unit 5 that drives it to rotate about a fixed axis b relative to the dual-axis mounting base 2; the first angular position adjustment unit 4 and the second angular position adjustment unit 5 are both independently provided on the dual-axis mounting base 2.

[0035] Specifically, the first angle adjustment unit 4 in this embodiment includes a first drive unit 41, a rocker arm shaft 42, a rocker arm 43, and a backlash spring 45. The first drive unit 41 is a stepper motor equipped with a reduction gearbox, and its output end is connected to the rocker arm shaft 42 (generally, the rocker arm shaft 42 is fitted onto the output end via a key). The rocker arm shaft 42 is fixedly connected to the output end of the first drive unit 41 along a direction parallel to the first axis a. The first drive unit 41 is mounted above the dual-axis mounting base 2, while the rocker arm shaft 42 is located below the dual-axis mounting base 2, with the output end of the first drive unit 41 passing through the dual-axis mounting base 2 to connect to the rocker arm shaft 42. Thus, under the drive of the first drive unit 41, the rocker arm shaft 42 rotates around its own axis. The rocker arm 43 is rigidly connected to the rocker arm shaft 42 along the radial direction of the rocker arm shaft 42, and the rocker arm 43 swings synchronously with the rotation of the rocker arm shaft 42. A fixed rod 44 is fixedly installed on the base 1. The fixed rod 44 and the rocker arm 43 form a contact engagement, so that the fixed rod 44 and the rocker arm 43 together form a lever transmission pair (the rocker arm 43 is the driving arm, and the fixed rod 44 is the fulcrum) to realize the transmission of angular displacement. That is, the rotational motion of the rocker arm shaft 4262 is converted into the angular displacement adjustment of the dual-axis mounting base 2 around the first axis a by the swinging contact motion between the rocker arm 43 and the fixed rod 44. Secondly, a backlash spring 45 that provides continuous preload is assembled between the base 1 and the dual-axis mounting base 2 to ensure that the fixed rod 44 and the rocker arm 43 are always in contact and do not disengage during the movement. The base 1 is fixedly provided with a first spring connecting rod 451 for one end of the backlash spring 45 to be connected, and the dual-axis mounting base 2 is fixedly provided with a second spring connecting rod 452 for the other end of the backlash spring 45 to be connected, ensuring that the rocker arm 43 and the fixed rod 44 have no gap contact.

[0036] Based on this, a lever transmission pair is formed by the fixed rod 44 and the rocker arm 43. Specifically, the contact position between the fixed rod 44 and the rocker arm 43 serves as the fulcrum of the lever transmission pair; the distance from the axis of the rocker arm shaft 42 to the contact end (fulcrum) of the rocker arm 43 serves as the active arm (the point of application of power is the axis of the rocker arm shaft 42); and the distance from the first axis a to the contact point (fulcrum) of the fixed rod 44 serves as the resistance arm (the point of application of resistance is the first axis a). Furthermore, the length of the resistance arm is greater than the active arm (the lever arm ratio can be adjusted according to actual accuracy requirements). The angular displacement is amplified by setting a lever arm ratio of 1:5. For example, when the ratio of the active arm L1 to the resistance arm L2 is 1:5, according to the principle of linear displacement conservation in lever transmission, the swing angle (θ1) of the rocker arm 43 and the swing angle (θ2) of the dual-axis mounting base 2 satisfy: θ2=θ1×(L1 / L2). Therefore, the swing angle θ2=θ1×1 / 5, that is, when the rocker arm 43 swings 0.5°, the dual-axis mounting base 2 swings θ2=0.5°×1 / 5=0.1° around the first axis a, and the angular displacement is reduced to 1 / 5 of the input. In summary, by setting a preset lever arm ratio, the rotational input of the first drive unit 41 is reduced and converted into the angular displacement of the dual-axis mounting base 2. In particular, the "larger input angle" of the drive unit is converted into the "small and precise angular displacement" of the optical mirror 3, realizing the fine adjustment of "large input angle and small output angle", improving the resolution of angle adjustment and meeting the fine adjustment requirements of high-precision optical systems. Secondly, the use of a long resistance arm and a short active arm can reduce the influence of vibration and fluctuation on angular displacement adjustment.

[0037] Specifically, in this embodiment, the second angular adjustment unit 5 drives the mirror mount 31 and the optical mirror 3 to rotate synchronously around the second axis b. The specific structure is as follows: The second angular adjustment unit 5 includes a second drive unit 51, which is fixed to the side of the pre-protrusion structure on the top surface of the dual-axis mounting base 2, and its output end is directly connected to the mirror mount 31. Furthermore, in this embodiment, the second axis b passes horizontally through the center point of the optical mirror 3, and correspondingly, the first axis a passes through the center point of the optical mirror 3.

[0038] In addition, in this embodiment, a preload torsion spring 22 is assembled between the dual-axis mounting base 2 and the mirror base 31 to provide a continuous preload force. The two ends of the preload torsion spring 22 are respectively in contact with the dual-axis mounting base 2 and the mirror base 31. That is, the top surface of the dual-axis mounting base 2 is formed with a stop bar 21 for one end of the preload torsion spring 22 to contact with it. The other end of the preload torsion spring 22 is fixed with a ball 221 and elastically rolls with the circumference of the mirror base 31 through the ball 221 (which reduces the frictional resistance between the end of the preload torsion spring 22 and the mirror base 31). Thus, the preload torsion spring 22 provides a preload torque to the mirror base 31, reducing the impact of the shaking of the mirror base 31 during the flip adjustment process on the angle adjustment.

[0039] In summary, to facilitate understanding of the optical adjustment frame in this embodiment, the following explanation will further elaborate on its specific working principle.

[0040] First, in conjunction with the appendix Figure 4 and 7 As shown, rotation around the first axis a is defined as horizontal angular adjustment, and rotation around the second axis b is defined as vertical angular adjustment.

[0041] Specifically, the angular displacement adjustment of the dual-axis mounting base 2 around the first axis a is as follows: the first drive unit 41 outputs power to the rocker arm shaft 42 to generate driving torque. Then, the rocker arm shaft 42 drives the rocker arm 43 to swing so that the rocker arm 43 applies pressure to the fixed rod 44. Thus, by using the lever transmission pair formed by the rocker arm 43 and the fixed rod 44, with the fixed rod 44 as a fixed fulcrum, the pressure is converted into a rotational driving force on the dual-axis mounting base 2 around the first axis a, thereby realizing the smooth swing adjustment of the dual-axis mounting base 2 relative to the base 1 around the first axis a. At the same time, the elastic force applied by the backlash spring 45 ensures that the rocker arm 43 and the fixed rod 44 always remain in contact.

[0042] Specifically, the angular displacement adjustment of the lens mount 31 is adjusted around the second axis b: the second drive unit 51 outputs power to the lens mount 31, and then the lens mount 31 and the optical mirror 3 rotate synchronously around the second axis b, thereby realizing the angular displacement adjustment of the optical mirror 3. At the same time, the pre-tensioning torsion spring 22 releases the pre-tensioning torque in real time during the rotation to avoid the shaking and vibration of the lens mount 31.

[0043] Based on this, the adjustment around the first axis a and the adjustment around the second axis b are independent orthogonal movements (the axes intersect perpendicularly at the center point of the optical mirror 3). They are mechanically decoupled through the dual-axis mounting base 2: adjustment of the first axis a only changes the orientation of the dual-axis mounting base 2, without affecting the rotation center of the mirror mount 31 around the second axis b; adjustment of the second axis b only drives the mirror mount 31 to rotate, without interfering with the position of the dual-axis mounting base 2. This collaborative design ensures that the dual-axis rotation center and the center point of the optical mirror 3 always coincide during two-dimensional angle adjustment, avoiding the "eccentric displacement" problem of traditional adjustment frames and meeting the alignment requirements of high-precision optical systems.

[0044] Furthermore, both the first drive unit 41 and the second drive unit 51 described above adopt a combination structure of a stepper motor and a gearbox. The gearbox can be equipped with gear sets of different transmission ratios according to actual needs, further achieving high-precision output, speed reduction, and torque increase. This approach further reduces the specification requirements of the stepper motor, especially making it an optimal drive method for miniaturized optical adjustment frames. Secondly, for those skilled in the art, the structure and principle of stepper motors and gearboxes are common knowledge, and components that meet actual needs can be selected; therefore, further details are omitted here.

[0045] Based on the above embodiments, a comparison is made between the traditional optical adjustment frame (dual-endpoint eccentric adjustment) and the proposed optical adjustment frame (dual-axis fixed-axis adjustment). The fundamental problem with the traditional adjustment frame is the uncontrollable motion caused by the lack of a fixed axis. This invention, through its dual-axis fixed-axis design, ensures that both rotation and oscillation trajectories are predictable circular / arc movements (rather than the traditional irregular curves), facilitating optical path calibration and error compensation. Furthermore, during the adjustment of the optical mirror 3 in this application, its optical center will not shift, especially addressing the issue that the shift of the traditional optical adjustment frame cannot be preset and requires real-time calibration. A detailed comparison is shown in the table below: Through the above structural design and working principle, this embodiment fundamentally solves the core defects of traditional optical adjustment frames, and realizes "high resolution, no offset, compact structure and small size" optical mirror 3-angle adjustment. It has advantages such as high adjustment accuracy, smooth movement, fast response and strong reliability, and is especially suitable for scenarios with strict requirements for optical path stability, such as laser alignment, interferometry, and optical detection.

[0046] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the utility model in any way. Any modifications or alterations made by those skilled in the art to the technical solution of this utility model without departing from its scope are equivalent embodiments of this utility model. Therefore, all equivalent changes made based on the concept of this utility model without departing from its scope should be covered within the protection scope of this utility model.

Claims

1. An optical adjustment platform for dual-axis concentric rotation adjustment, characterized in that: The system includes a base (1), a dual-axis mounting base (2), and a mirror mount (31) with an optical lens (3). The dual-axis mounting base (2) is hinged to the base (1) to form a first axis (a), and the mirror mount (31) is hinged to the dual-axis mounting base (2) to form a second axis (b). The first axis (a) and the second axis (b) intersect perpendicularly. The dual-axis mounting base (2) is equipped with a first angular adjustment unit (4) that drives it to swing about the first axis (a) relative to the base (1). The optical lens (3) is equipped with a second angular adjustment unit (5) that drives it to rotate about the second axis (b) relative to the dual-axis mounting base (2). The first angular adjustment unit (4) and the second angular adjustment unit (5) are both independently mounted on the dual-axis mounting base (2).

2. The optical adjustment platform for dual-axis concentric rotation adjustment according to claim 1, characterized in that: The first axis (a) intersects the second axis (b) perpendicularly at the center point C of the optical mirror (3).

3. The optical adjustment platform for dual-axis concentric rotation adjustment according to claim 1, characterized in that: The base (1) is fixed with a connecting shaft (13) extending along the first axis (a), and the dual-axis mounting base (2) is hinged to the connecting shaft (13). The dual-axis mounting base (2) is provided with at least one support part (14) that is slidably connected in a direction parallel to the first axis (a). The bottom of the support part (14) is elastically abutting against the base (1).

4. The optical adjustment platform for dual-axis concentric rotation adjustment according to claim 3, characterized in that: The bottom of the support part (14) is provided with a ball (141) for rolling contact with the base (1), and a compression spring (142) is sleeved on the upper part of the support part (14), and the two ends of the compression spring (142) act on the support part (14) and the dual-axis mounting base (2) respectively.

5. The optical adjustment platform for dual-axis concentric rotation adjustment according to claim 1, characterized in that: The first angular adjustment unit (4) includes a first drive unit (41), a rocker arm shaft (42), and a rocker arm (43). The rocker arm shaft (42) is fixedly connected to the output end of the first drive unit (41) in a direction parallel to the first axis (a). The rocker arm shaft (42) rotates around its own axis under the drive of the first drive unit (41). The rocker arm (43) is rigidly connected to the rocker arm shaft (42) in the radial direction along the rocker arm shaft (42), and the rocker arm (43) is rigidly connected to the rocker arm shaft (42) in the radial direction. 3) It swings synchronously with the rotation of the rocker arm shaft (42); the base (1) is fixedly provided with a fixed rod (44), which is in contact with the rocker arm (43), so that the fixed rod (44) and the rocker arm (43) together form a lever transmission pair to realize the transmission of angular displacement; a backlash spring (45) that provides continuous preload is assembled between the base (1) and the dual-axis mounting seat (2) to ensure that the fixed rod (44) and the rocker arm (43) are always in contact and do not separate during the movement.

6. The optical adjustment platform for dual-axis concentric rotation adjustment according to claim 1, characterized in that: The base (1) is fixedly provided with a first spring link (451) for connecting one end of the backlash spring (45), and the dual-axis mounting base (2) is fixedly provided with a second spring link (452) for connecting the other end of the backlash spring (45).

7. The optical adjustment platform for dual-axis concentric rotation adjustment according to claim 1, characterized in that: The second angle adjustment unit (5) includes a second drive unit (51), and the mirror mount (31) is fixed to the output end of the second drive unit (51), so that the mirror mount (31) rotates around the second axis (b) under the drive of the second drive unit (51).

8. The optical adjustment platform for dual-axis concentric rotation adjustment according to claim 1, characterized in that: A preload torsion spring (22) that provides continuous preload force is assembled between the dual-axis mounting base (2) and the mirror base (31), wherein the two ends of the preload torsion spring (22) respectively engage with the dual-axis mounting base (2) and the mirror base (31).

9. The optical adjustment platform for dual-axis concentric rotation adjustment according to claim 1, characterized in that: One end of the pre-tensioned torsion spring is provided with a ball (221) that rolls in contact with the mirror base (31).

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