A high-stability zoom lens and a mounting and debugging method thereof

Abstract

The present application relates to a zoom lens, in particular to a high-stability zoom lens and a mounting and debugging method thereof, which solves the problem that the internal zoom assembly of the existing zoom lens will produce irregular axial and radial movement due to the axial and radial gap between the zoom assembly and the mounting frame under the vibration environment, resulting in poor imaging stability of the zoom lens, and the present application comprises a mounting frame, a gear cylinder coaxially sleeved on the outer wall of the mounting cylinder of the mounting frame, and a zoom lens barrel coaxially arranged in the mounting cylinder; the outer wall of the gear cylinder is provided with a spiral groove, the mounting cylinder is provided with a guide straight groove in the axial direction, the outer wall of the zoom lens barrel is provided with a guide pin, the guide pin penetrates through the guide straight groove and extends into the spiral groove; one end of the gear cylinder abuts against the limiting boss of the mounting cylinder, and the other end abuts against the inner end face of the corrugated spring sheet, and the corrugated spring sheet is used for providing the gear cylinder with an axial pre-tightening force; at least two mounting grooves are provided on the outer wall of the zoom lens barrel, and radial spring sheets for providing the zoom lens barrel with radial pre-tightening force are arranged in the mounting grooves.

Description

Technical Field

[0001] This invention relates to zoom lenses, specifically to a high-stability zoom lens and its installation and adjustment method. Background Technology

[0002] In the aerospace field, high-precision zoom lenses are commonly used for observation and measurement tasks such as angle measurement. Currently, most zoom lenses consist of a zoom assembly and a mounting bracket. The zoom assembly is mounted on the mounting bracket, but there are axial and radial clearances between the zoom assembly and the mounting bracket. If there are no external environmental influences, these clearances will not affect the imaging of the zoom lens. However, the working environment of the zoom lens is usually not independent, but rather it is installed together with other equipment. When other equipment is working, it will generate vibrations. These mechanical vibrations will cause the zoom assembly to undergo irregular axial and radial movements during zooming operations due to the existence of axial and radial clearances. This will reduce the imaging stability of the entire zoom lens, resulting in large errors or even erroneous angle measurements. In severe cases, it may even cause the entire observation and measurement system to fail. Summary of the Invention

[0003] The purpose of this invention is to solve the technical problem that existing zoom lenses, under vibration, will experience irregular axial and radial movements due to the axial and radial gaps between the zoom components and the mounting bracket, resulting in poor imaging stability. The invention provides a highly stable zoom lens and its installation and adjustment method.

[0004] To address the technical problems existing in the prior art, the present invention provides the following technical solution:

[0005] A highly stable zoom lens, characterized by comprising a mounting bracket, a gear cylinder, a zoom lens barrel, a corrugated spring sheet, and a radial spring sheet;

[0006] The mounting frame includes a mounting cylinder and a fixed seat disposed on the outer wall of the mounting cylinder. A guide groove is provided on the outer wall of the mounting cylinder along the axial direction.

[0007] The gear cylinder is coaxially sleeved on the outer wall of the mounting cylinder. A spiral groove is provided on the outer wall of the gear cylinder, and an external gear ring is provided on the outer wall of the gear cylinder in the circumferential direction. A motor is provided on the outer wall of the mounting cylinder, and a drive gear is connected to the output end of the motor. The drive gear meshes with the external gear ring.

[0008] The zoom lens barrel is coaxially arranged inside the mounting tube. An optical lens is installed inside the zoom lens barrel, and a guide pin is installed on the outer wall of the zoom lens barrel. The guide pin passes through the guide straight groove and extends into the spiral groove in sequence.

[0009] One end of the gear cylinder abuts against the limiting boss on the outer wall of the mounting cylinder, and the other end abuts against the inner end face of the corrugated spring sheet. The corrugated spring sheet is coaxially sleeved on the outer wall of the mounting cylinder, and a pressure ring abuts against the outer end face of the corrugated spring sheet. The pressure ring is coaxial and threadedly connected to the outer wall of the mounting cylinder.

[0010] At least two mounting slots are provided on the outer wall of the zoom lens barrel. The two mounting slots are distributed circumferentially. Each mounting slot is provided with a radial spring. The top surface of the radial spring abuts against the inner wall of the mounting barrel, and the two ends abut against the bottom surface of the mounting slot.

[0011] Furthermore, a motor mounting platform is provided on the outer wall of the mounting cylinder. The top surface of the motor mounting platform has an angle of 15-20° with the horizontal plane. A strip hole is provided on the motor mounting platform. The motor is mounted on the motor mounting platform by means of adjusting bolts that cooperate with the strip hole, which is used to adjust the meshing clearance between the drive gear and the external gear ring.

[0012] Furthermore, the left end of the zoom lens barrel extends out of the mounting cylinder, and a grating ruler is provided on the outer wall of the extended portion of the zoom lens barrel.

[0013] Furthermore, it also includes axial bearings, of which two are provided. One is located between the limiting boss and the gear cylinder, and the other is located between the gear cylinder and the corrugated spring plate. The gear cylinder abuts against the inner end face of the limiting boss and the corrugated spring plate respectively through the two axial bearings. A guide bearing is sleeved on the guide pin, and the guide bearing is located in the helical groove.

[0014] Meanwhile, the present invention also provides a method for installing and adjusting a high-stability zoom lens, which is used for installing and adjusting the aforementioned high-stability zoom lens, and is characterized by including the following steps:

[0015] S1: Install the radial spring into the mounting slot on the zoom lens barrel, with both ends of the radial spring abutting against the bottom surface of the mounting slot. Then install the optical lens into the zoom lens barrel and place the zoom lens barrel into the mounting tube. At this time, the top surface of the radial spring abuts against the inner wall of the mounting tube, providing radial preload to the zoom lens barrel.

[0016] S2: Insert the gear cylinder, corrugated spring sheet, and pressure ring into the mounting cylinder one by one. One end of the gear cylinder abuts against the limiting boss on the outer wall of the mounting cylinder, and the other end abuts against the inner end face of the corrugated spring sheet. The pressure ring is threaded to the mounting cylinder and abuts against the outer end face of the corrugated spring sheet. At this time, the corrugated spring sheet will be compressed, providing axial preload to the gear cylinder. The axial preload can be adjusted by adjusting the pressure ring.

[0017] S3: After passing the guide pin through the spiral groove on the gear cylinder and the guide straight groove on the mounting cylinder in sequence, install it onto the outer wall of the zoom lens barrel.

[0018] S4: Install the motor onto the outer wall of the mounting cylinder, so that the drive gear connected to the motor output end meshes with the external gear ring on the outer wall of the gear cylinder, and adjust the meshing clearance between the drive gear and the external gear ring to complete the installation and debugging of the high-stability zoom lens.

[0019] Further, in step S4, the motor is mounted on the motor mounting platform on the outer wall of the mounting cylinder.

[0020] Furthermore, step S4 specifically includes:

[0021] S4.1: Install the motor onto the motor mounting platform on the outer wall of the mounting cylinder, so that the drive gear connected to the motor output end initially meshes with the external gear ring on the outer wall of the gear cylinder;

[0022] S4.2: Move the motor downwards along the top surface of the motor mounting platform until the drive gear and the external gear ring are engaged at their limit position;

[0023] S4.3: Move the motor upwards along the top surface of the motor mounting platform to any position on the motor mounting platform. Drive the motor to rotate clockwise through a certain angle, and then drive the motor to rotate counterclockwise through the same angle. Observe whether the gear cylinder returns to the initial clockwise position. If the gear cylinder returns to the initial clockwise position, it indicates that there is no gap between the drive gear and the external gear ring. Then tighten the adjusting bolt to fix the motor position and complete the installation and debugging of the high-stability zoom lens. If the gear cylinder does not return to the initial clockwise position, proceed to S4.4.

[0024] S4.4: Repeat step S4.3 until the gear cylinder returns to the initial forward rotation position, which indicates that there is no gap between the drive gear and the external gear ring. Then tighten the adjusting bolt to fix the motor position and complete the installation and debugging of the high-stability zoom lens.

[0025] Furthermore, in step S2, before the gear cylinder is inserted from one end of the mounting cylinder, an axial bearing is inserted from one end of the mounting cylinder; before the corrugated spring sheet is inserted from one end of the mounting cylinder, another axial bearing is inserted from one end of the mounting cylinder, so that the gear cylinder abuts against the limiting boss and the inner end face of the corrugated spring sheet respectively through the two axial bearings.

[0026] Further, step S3 specifically involves: first, installing a guide bearing onto the guide pin, then sequentially passing the guide pin through the spiral groove on the gear cylinder and the guide straight groove on the mounting cylinder before installing it onto the outer wall of the zoom lens barrel, with the guide bearing located within the spiral groove.

[0027] Furthermore, in steps S4.3 and S4.4, the gear cylinder is confirmed to have returned to its initial forward rotation position by observing the reading of the grating ruler.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] (1) The present invention provides a high-stability zoom lens, wherein a corrugated spring sheet is provided at one end of the gear cylinder, the inner end face of the corrugated spring sheet abuts against the gear cylinder, a pressure ring is provided on the outer end face of the corrugated spring sheet, the pressure ring is threadedly connected to the mounting cylinder, a guide pin is installed on the outer wall of the zoom lens barrel, a spiral groove is provided on the gear cylinder, and a guide straight groove is provided on the mounting cylinder. The guide pin passes through the spiral groove and extends into the guide straight groove in sequence. In this way, by tightening the pressure ring, the corrugated spring sheet applies an axial preload to the gear cylinder. The magnitude of the axial preload can be adjusted by the pressure ring, so that the gear cylinder is driven to rotate by the drive gear connected to the output end of the motor. During operation, even in a vibrating environment, axial movement will not occur. The guide pin is located in the helical groove of the gear cylinder, which also restricts axial movement. Consequently, the zoom lens barrel connected to the guide pin cannot move axially. At least two mounting slots are provided on the outer wall of the zoom lens barrel. Radial springs are installed in the mounting slots. The top surface of the radial springs abuts against the inner wall of the mounting cylinder, and the two ends of the radial springs abut against the bottom surface of the mounting slots. In this way, during the adjustment process, the radial springs apply a radial preload to the zoom lens barrel, ensuring that it will not move radially even in a vibrating environment, thus ensuring the stability of the zoom lens imaging.

[0030] (2) The high-stability zoom lens provided by the present invention has a motor mounting platform on the outer wall of the mounting cylinder, and the top surface of the motor mounting platform has an angle with the horizontal plane. The motor is mounted on the motor mounting platform through the adjustment bolt and the slotted hole. Because there will be errors in the processing and installation of the drive gear and the external gear ring, the two will not mesh tightly together when they mesh, and there will be a gap between the working surfaces of the gear teeth. Since the motor is fixed on the motor mounting platform through the slotted hole and the adjustment bolt, the motor can slide along the top surface of the motor mounting platform. During the sliding process, the gap between the working surfaces of the drive gear teeth and the working surfaces of the external gear ring teeth will gradually decrease until the two mesh without gap. When the drive gear rotates, there will be no backlash error, the angle through which the gear cylinder rotates will be more accurate, and the transmission process will be more stable.

[0031] (3) In a high-stability zoom lens provided by the present invention, a guide bearing is sleeved on the guide pin and the guide bearing is in the spiral groove. When the guide pin moves in the spiral groove, the sliding friction is converted into rolling friction through the guide bearing, the friction force is reduced, and the adjustment is smoother.

[0032] (4) In the high-stability zoom lens provided by the present invention, axial bearings are provided between the limiting boss and the gear cylinder and between the gear cylinder and the corrugated spring sheet. The axial bearings can reduce the frictional force on the gear cylinder caused by the axial preload of the corrugated spring sheet, and can ensure that the gear cylinder rotates smoothly during zooming. Attached Figure Description

[0033] Figure 1 This is a front view of an embodiment of the high-stability zoom lens of the present invention;

[0034] Figure 2 for Figure 1 The right view;

[0035] Figure 3 This is an axial sectional view of an embodiment of the high-stability zoom lens of the present invention;

[0036] Figure 4 This is a radial sectional view of an embodiment of the high-stability zoom lens of the present invention;

[0037] Figure 5 This is a front view of the radial spring in an embodiment of the high-stability zoom lens of the present invention;

[0038] Figure 6 for Figure 5 Top view.

[0039] The annotations in the attached figures are explained as follows:

[0040] 1-Mounting bracket, 101-Mounting cylinder, 102-Fixed base, 103-Motor mounting platform; 2-Gear cylinder, 21-External gear ring; 3-Zoom lens barrel, 4-Optical lens, 5-Motor, 6-Drive gear, 7-Guide pin, 8-Wave spring sheet, 9-Radial spring sheet, 10-Axial bearing, 11-Pressure ring, 12-Guide bearing, 13-Grating ruler. Detailed Implementation

[0041] The present invention will be further described below with reference to the accompanying drawings and exemplary embodiments.

[0042] Reference Figures 1-6 The present invention provides a high-stability zoom lens, including a mounting frame 1. The mounting frame 1 includes a mounting cylinder 101 and a fixing seat 102 disposed on the outer wall of the mounting cylinder 101. The mounting cylinder 101 is a cylindrical structure, and a motor mounting platform 103 is disposed on its outer wall. The top surface of the motor mounting platform 103 has an angle with the horizontal plane, and a strip hole is opened on the motor mounting platform 103. The motor 5 is mounted on the motor mounting platform 103 through the strip hole and the adjusting bolt. This connection structure allows the motor 5 to slide along the top surface of the motor mounting platform 103. A drive gear 6 is connected to the output end of the motor 5.

[0043] A gear cylinder 2 is fitted on the outer wall of the mounting cylinder 101, and the gear cylinder 2 is coaxial with the mounting cylinder 101. An external gear ring 21 is provided on the outer wall of the gear cylinder 2 along the circumferential direction. The external gear ring 21 is used to mesh with the drive gear 6. A spiral groove is provided on the outer wall of the gear cylinder 2, and a guide straight groove is provided on the outer wall of the mounting cylinder 101 along the axial direction.

[0044] The zoom lens barrel 3 is coaxially arranged inside the mounting cylinder 101. The zoom lens barrel 3 contains an optical lens 4. A guide pin 7 is installed on the outer wall of the zoom lens barrel 3. The guide pin 7 passes through the guide groove on the mounting cylinder 101 and extends into the spiral groove on the gear cylinder 2. When the drive gear 6 drives the gear cylinder 2 to rotate through the outer gear ring 21, the guide pin 7 will be pushed by the spiral groove and move linearly along the axial direction in the guide groove. This can drive the zoom lens barrel 3 to move along the axial direction to achieve zooming. The whole structure is simple. Furthermore, a guide bearing 12 is also sleeved on the guide pin 7. The guide bearing 12 is located in the spiral groove. The sliding friction between the guide pin 7 and the spiral groove is changed to rolling friction by the guide bearing 12, making the rotation adjustment of the gear cylinder 2 smoother.

[0045] To prevent axial movement of the zoom lens barrel 3 when adjusting the focal length, a corrugated spring plate 8 is coaxially arranged on the outer wall of the mounting cylinder 101, and axial bearings 10 for bearing axial force are respectively arranged at both ends of the gear cylinder 2. The axial bearings 10 are thrust ball bearings, which have a simple structure and high stability. The gear cylinder 2 abuts against the limiting boss on the outer wall of the mounting cylinder 101 and the inner end face of the corrugated spring plate 8 via two axial bearings 10. The corrugated spring plate 8 provides axial preload to the gear cylinder 2. To adjust the magnitude of the axial preload, a pressure ring 11 is abutted against the outer end face of the corrugated spring plate 8. The pressure ring 11 is coaxially mounted on the outer wall of the mounting cylinder 101 and threadedly connected to the mounting cylinder 101. By rotating the pressure ring 11, the magnitude of the axial preload can be adjusted. With the limitation of the axial preload, the gear cylinder 2 cannot move axially even in a vibration environment during the adjustment process. However, while the corrugated spring plate 8 provides preload, the friction between the limiting boss and the gear cylinder 2, as well as between the gear cylinder 2 and the corrugated spring plate 8, also increases. At this time, the original sliding friction is changed to rolling friction through the axial bearings 10, making the gear cylinder 2 rotate more smoothly during the zooming process. The overall structure is simple and easy to operate. Because the guide pin 7 is located in the spiral groove on the gear cylinder 2 and is restricted by the spiral groove, when the gear cylinder 2 cannot move axially, the zoom lens barrel 3 connected to the guide pin 7 can no longer move axially.

[0046] To prevent radial movement, this embodiment uses a mounting groove on the outer wall of the zoom lens barrel 3 and a radial spring 9 in the mounting groove to provide radial preload for the zoom lens barrel 3. At least two radial springs 9 are required to provide a stable radial preload for the zoom lens barrel 3. However, the zoom lens barrel 3 itself has a thin wall thickness. If too many mounting grooves are opened, it will affect its structural strength. Therefore, in this embodiment, only two mounting grooves are set to meet the radial preload requirement. The two mounting grooves are distributed circumferentially, and each mounting groove is provided with a radial spring 9. The top surface of the radial spring 9 abuts against the inner wall of the mounting cylinder 101, and the two ends abut against the bottom surface of the mounting groove. In this way, a radial preload is applied to the zoom lens barrel 3 through the radial spring 9. Even when zooming in a vibrating environment, there will be no radial movement. The overall structure is simple and does not significantly change the structure of the zoom lens, saving processing and manufacturing costs.

[0047] The entire zoom lens barrel 3 is driven by a motor 5. The motor 5 meshes with the outer gear ring 21 of the gear cylinder 2 via a drive gear 6 at its output end. However, due to manufacturing and installation errors, the meshing clearance between the drive gear 6 and the outer gear ring 21 is generally greater than the minimum meshing clearance. In this invention, the motor mounting platform 103 is designed to be inclined, with its top surface having an angle of 15-20° with the horizontal plane. In this embodiment, the angle between the top surface and the horizontal plane is 20°, allowing the motor 5 to slide along the top surface of the motor mounting platform 103. Furthermore, a grating ruler 13 is provided on the zoom lens barrel 3. The left end of the zoom lens barrel 3 extends out of the mounting cylinder 101, and the grating ruler 13 is located on the outer wall of the extended portion of the zoom lens barrel 3.

[0048] Meanwhile, the present invention also provides a method for installing and adjusting a high-stability zoom lens, which is used for installing and adjusting the aforementioned high-stability zoom lens, including the following steps:

[0049] S1: Install the radial spring 9 into the mounting groove on the zoom lens barrel 3. The two ends of the radial spring 9 abut against the bottom surface of the mounting groove, and install the optical lens 4 into the zoom lens barrel 3. Then, place the zoom lens barrel 3 into the mounting cylinder 101. At this time, the top surface of the radial spring 9 abuts against the inner wall of the mounting cylinder 101, providing radial preload to the zoom lens barrel 3.

[0050] S2: Insert the gear cylinder 2, the corrugated spring plate 8, and the pressure ring 11 into one end of the mounting cylinder 101 in sequence. One end of the gear cylinder 2 abuts against the limiting boss on the outer wall of the mounting cylinder 101, and the other end abuts against the inner end face of the corrugated spring plate 8. The pressure ring 11 is threaded to the mounting cylinder 101 and abuts against the outer end face of the corrugated spring plate 8. At this time, the corrugated spring plate 8 will be compressed to provide axial preload for the gear cylinder 2. The magnitude of the axial preload can be adjusted by adjusting the pressure ring 11.

[0051] S3: After passing the guide pin 7 through the spiral groove on the gear cylinder 2 and the guide straight groove on the mounting cylinder 101 in sequence, install it onto the outer wall of the zoom lens barrel 3.

[0052] S4: Install the motor 5 onto the outer wall of the mounting cylinder 101, so that the drive gear 6 connected to the output end of the motor 5 meshes with the external gear ring 21 on the outer wall of the gear cylinder 2, and adjust the meshing clearance between the drive gear 6 and the external gear ring 21 to complete the installation and debugging of the high-stability zoom lens.

[0053] In step S2, before the gear cylinder 2 is inserted from one end of the mounting cylinder 101, an axial bearing 10 is inserted from one end of the mounting cylinder 101; before the corrugated spring plate 8 is inserted from one end of the mounting cylinder 101, another axial bearing 10 is inserted from one end of the mounting cylinder 101, so that the gear cylinder 2 abuts against the limiting boss and the inner end face of the corrugated spring plate 8 respectively through the two axial bearings 10.

[0054] By using two axial bearings 10, the sliding friction between the gear cylinder 2 and the limiting boss, as well as between the gear cylinder 2 and the corrugated spring plate 8, is transformed into rolling friction, which allows for smoother rotation of the gear cylinder 2.

[0055] Step S3 is as follows: First, a guide bearing 12 is fitted onto the guide pin 7. Then, the guide pin 7 is passed through the spiral groove on the gear cylinder 2 and the guide straight groove on the mounting cylinder 2 in sequence and installed on the outer wall of the zoom lens barrel 3, with the guide bearing 12 located in the spiral groove.

[0056] The guide bearing 12 can convert the sliding friction between the guide pin 7 and the gear cylinder 2 into rolling friction, so that the guide pin 7 can move more smoothly in the spiral straight groove on the gear cylinder 2.

[0057] Because the outer wall of the mounting cylinder 101 is provided with a motor mounting platform 103 for mounting the motor 5, and the motor 5 can slide along the top surface of the motor mounting platform 103, in step S4, the motor 5 is mounted on the motor mounting platform 103 on the outer wall of the mounting cylinder 101.

[0058] Because there are errors in the machining and installation of the drive gear 6 and the external gear ring 21, they will not mesh tightly when engaged. There will be a gap between the working surfaces of their teeth. When the motor 5 rotates forward, the teeth of the two gears are tightly meshed. The gear cylinder 2 driven by the external gear ring 21 will rotate by the same angle as the drive gear 6 rotates. However, when the motor 5 rotates in reverse, due to this gap, the gear cylinder 2 driven by the external gear ring 21 will not rotate by the same angle when the motor 5 rotates by a certain angle. This is called return error. Return error will affect the focus adjustment accuracy and the stability of the transmission process. Therefore, step S4 is as follows:

[0059] S4.1: Install the motor 5 onto the motor mounting platform 103 on the outer wall of the mounting cylinder 101, so that the drive gear 6 connected to the output end of the motor 5 initially meshes with the external gear ring 21 on the outer wall of the gear cylinder 2;

[0060] S4.2: Move the motor 5 downwards along the top surface of the motor mounting platform 103 until the drive gear 6 and the external gear ring 21 are engaged at their limit position;

[0061] S4.3: Move motor 5 upwards along the top surface of motor mounting platform 103 to any position on motor mounting platform 103, drive motor 5 to rotate clockwise through a certain angle, and then drive motor 5 to rotate counterclockwise through the same angle. Observe whether gear cylinder 2 returns to the initial position of clockwise rotation. If gear cylinder 2 returns to the initial position of clockwise rotation, it indicates that there is no gap between drive gear 6 and external gear ring 21. Then tighten the adjusting bolt to fix the position of motor 5 and complete the installation and debugging of high-stability zoom lens. If gear cylinder 2 does not return to the initial position of clockwise rotation, proceed to S4.4.

[0062] S4.4: Repeat step S4.3 until gear cylinder 2 returns to the initial forward rotation position, which indicates that there is no gap between drive gear 6 and external gear ring 21. Then tighten the adjusting bolt to fix the position of motor 5 and complete the installation and debugging of the high-stability zoom lens.

[0063] The meshing clearance between the teeth of the drive gear 6 and the teeth of the external gear ring 21 is very small, making it difficult to directly observe with the naked eye whether the gear cylinder 2 has returned to the initial forward rotation position. Therefore, in steps S4.3 and S4.4, the reading of the grating ruler 13 is used to confirm whether the gear cylinder 2 has returned to the initial forward rotation position. When the gear cylinder 2 rotates, it will drive the zoom lens barrel 3 to move along the axial direction. If the gear cylinder 2 returns to the initial forward rotation position after rotating forward and backward, the zoom lens barrel 3 will also return to the initial position. In this way, the grating ruler 13 can be used to indirectly know whether the gear cylinder 2 has returned to the initial forward rotation position. Moreover, the measurement of the grating ruler 13 is more accurate, and it is more convenient and faster to observe by reading its value.

[0064] The embodiments described above are merely illustrative of specific implementations of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A highly stable zoom lens, characterized in that: Includes mounting bracket (1), gear cylinder (2), zoom lens barrel (3), corrugated spring sheet (8) and radial spring sheet (9); The mounting frame (1) includes a mounting cylinder (101) and a fixing seat (102) disposed on the outer wall of the mounting cylinder (101). A guide groove is provided on the outer wall of the mounting cylinder (101) along the axial direction. The gear cylinder (2) is coaxially sleeved on the outer wall of the mounting cylinder (101). A spiral groove is provided on the outer wall of the gear cylinder (2), and an external gear ring (21) is provided on the outer wall of the gear cylinder (2) in the circumferential direction. A motor (5) is provided on the outer wall of the mounting cylinder (101). The output end of the motor (5) is connected to a drive gear (6), and the drive gear (6) meshes with the external gear ring (21). The zoom lens barrel (3) is coaxially arranged inside the mounting tube (101). An optical lens (4) is provided inside the zoom lens barrel (3), and a guide pin (7) is installed on the outer wall of the zoom lens barrel (3). The guide pin (7) passes through the guide straight groove and extends into the spiral groove. One end of the gear cylinder (2) abuts against the limiting boss on the outer wall of the mounting cylinder (101), and the other end abuts against the inner end face of the corrugated spring sheet (8). The corrugated spring sheet (8) is coaxially sleeved on the outer wall of the mounting cylinder (101). A pressure ring (11) abuts against the outer end face of the corrugated spring sheet (8). The pressure ring (11) is coaxial and threadedly connected to the outer wall of the mounting cylinder (101). The axial preload can be adjusted by adjusting the pressure ring (11). At least two mounting slots are provided on the outer wall of the zoom lens barrel (3). The two mounting slots are distributed along the circumference. Each mounting slot is provided with a radial spring (9). The radial spring (9) has an arc-shaped structure. Its top surface abuts against the inner wall of the mounting barrel (101), and its two ends abut against the bottom surface of the mounting slot respectively. The mounting cylinder (101) is provided with a motor mounting platform (103) on its outer wall. The top surface of the motor mounting platform (103) has an angle of 15-20° with the horizontal plane. A strip hole is provided on the motor mounting platform (103). The motor (5) is mounted on the motor mounting platform (103) by adjusting the bolts and the strip hole, which is used to adjust the meshing clearance between the drive gear (6) and the external gear ring (21). It also includes an axial bearing (10), two axial bearings (10) are provided, one of which is located between the limiting boss and the gear cylinder (2), and the other is located between the gear cylinder (2) and the corrugated spring plate (8). The gear cylinder (2) abuts against the inner end face of the limiting boss and the corrugated spring plate (8) respectively through the two axial bearings (10); the guide pin (7) is fitted with a guide bearing (12), and the guide bearing (12) is located in the spiral groove.

2. The high-stability zoom lens according to claim 1, characterized in that: The zoom lens barrel (3) extends out of the mounting tube (101) at its left end, and a grating ruler (13) is provided on the outer wall of the extended part of the zoom lens barrel (3).

3. A method for installing and adjusting a high-stability zoom lens, used for installing and adjusting the high-stability zoom lens according to any one of claims 1-2, characterized in that, Includes the following steps: S1: Install the radial spring (9) into the mounting groove on the zoom lens barrel (3), with both ends of the radial spring (9) abutting against the bottom surface of the mounting groove respectively, and install the optical lens (4) into the zoom lens barrel (3), and then place the zoom lens barrel (3) into the mounting tube (101). At this time, the top surface of the radial spring (9) abuts against the inner wall of the mounting tube (101) to provide radial preload for the zoom lens barrel (3); S2: Insert the gear cylinder (2), the corrugated spring plate (8) and the pressure ring (11) into one end of the mounting cylinder (101) in sequence. One end of the gear cylinder (2) abuts against the limiting boss on the outer wall of the mounting cylinder (101), and the other end abuts against the inner end face of the corrugated spring plate (8). The pressure ring (11) is threaded to the mounting cylinder (101) and abuts against the outer end face of the corrugated spring plate (8). At this time, the corrugated spring plate (8) will be compressed to provide axial preload to the gear cylinder (2). The axial preload can be adjusted by adjusting the pressure ring (11). S3: After passing the guide pin (7) through the spiral groove opened on the gear cylinder (2) and the guide straight groove opened on the mounting cylinder (101) in sequence, install it onto the outer wall of the zoom lens barrel (3); S4: Install the motor (5) onto the outer wall of the mounting cylinder (101), so that the drive gear (6) connected to the output end of the motor (5) meshes with the outer gear ring (21) on the outer wall of the gear cylinder (2), and adjust the meshing gap between the drive gear (6) and the outer gear ring (21) to complete the installation and debugging of the high-stability zoom lens.

4. The installation and debugging method for a high-stability zoom lens according to claim 3, characterized in that: In step S4, the motor (5) is mounted on the motor mounting platform (103) on the outer wall of the mounting cylinder (101).

5. The installation and debugging method for a high-stability zoom lens according to claim 4, characterized in that, Step S4 is as follows: S4.1: Install the motor (5) onto the motor mounting platform (103) on the outer wall of the mounting cylinder (101) so that the drive gear (6) connected to the output end of the motor (5) initially meshes with the external gear ring (21) on the outer wall of the gear cylinder (2); S4.2: Move the motor (5) downward along the top surface of the motor mounting platform (103) to the limit position where the drive gear (6) and the external gear ring (21) mesh; S4.3: Move the motor (5) upward along the top surface of the motor mounting platform (103) to any position on the motor mounting platform (103), drive the motor (5) to rotate forward by a certain angle, and then drive the motor (5) to rotate backward by the same angle. Observe whether the gear cylinder (2) returns to the initial position of forward rotation. If the gear cylinder (2) returns to the initial position of forward rotation, it indicates that there is no gap between the drive gear (6) and the external gear ring (21). Then tighten the adjusting bolt to fix the position of the motor (5) and complete the installation and debugging of the high-stability zoom lens. If the gear cylinder (2) does not return to the initial position of forward rotation, then execute S4.

4. S4.4: Repeat step S4.3 until the gear cylinder (2) returns to the initial position of forward rotation, which indicates that there is no gap between the drive gear (6) and the outer gear ring (21). Then tighten the adjusting bolt to fix the position of the motor (5) and complete the installation and debugging of the high-stability zoom lens.

6. The installation and debugging method for a high-stability zoom lens according to claim 5, characterized in that: In step S2, before the gear cylinder (2) is inserted from one end of the mounting cylinder (101), an axial bearing (10) is inserted from one end of the mounting cylinder (101); before the corrugated spring sheet (8) is inserted from one end of the mounting cylinder (101), another axial bearing (10) is inserted from one end of the mounting cylinder (101), so that the gear cylinder (2) abuts against the limiting boss and the inner end face of the corrugated spring sheet (8) respectively through the two axial bearings (10).

7. The installation and debugging method for a high-stability zoom lens according to claim 6, characterized in that, Step S3 is as follows: First, a guide bearing (12) is fitted onto the guide pin (7). Then, the guide pin (7) is passed through the spiral groove opened on the gear cylinder (2) and the guide straight groove opened on the mounting cylinder (101) and installed on the outer wall of the zoom lens barrel (3), with the guide bearing (12) located in the spiral groove.

8. The installation and debugging method of the high-stability zoom lens according to claim 7, characterized in that: In steps S4.3 and S4.4, the gear cylinder (2) is confirmed to have returned to the initial forward rotation position by observing the reading of the grating ruler (13).

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