Adjusting frame for large aperture optical lenses

Abstract

The utility model relates to a kind of adjusting frame suitable for large aperture optical lens, including machine frame, mirror frame, drive assembly, universal coupling assembly, first support assembly and second support assembly, machine frame is made by aluminium plate processing splicing;Mirror frame is used to install large aperture optical lens, and the bottom two sides are respectively equipped with first mirror frame flange and second mirror frame flange;Drive assembly is fixed on machine frame by screw, universal coupling assembly two ends are respectively connected drive assembly and mirror frame.Using two groups of drive assembly, corresponding pitch, yaw adjustment direction respectively, solve the problem that the adjustment range of prior art is limited.In addition, the spherical head rod of universal coupling assembly and spherical head flange spherical surface cooperate, the movement direction deviation of drive assembly and mirror frame can be compensated, avoid the jam in the process of adjusting, ensure smoothness of operation.

Description

Technical Field

[0001] This utility model relates to an adjustment bracket, and more particularly to an adjustment bracket suitable for large-diameter optical lenses. Background Technology

[0002] Currently, large-aperture optical lenses are widely used in astronomical observation, laser processing, and precision optical testing. Their installation and positioning accuracy directly affects the imaging quality or energy transmission efficiency of the entire optical system. Therefore, adjustment frames adapted to large-aperture optical lenses have become one of the core components of optical equipment. With the development of optical technology, market requirements for adjustment frames are gradually focusing on lightweight design, large-angle adjustment, high-precision positioning, and long-term stability. They must not only meet the load-bearing requirements of large-aperture lenses but also achieve flexible adjustment in multiple directions such as pitch and yaw, while avoiding accuracy drift caused by structural loosening after adjustment.

[0003] Existing technologies include optical angle adjustment mechanisms, such as an optical angle adjustment frame comprising a base plate, a first adjustment plate, a second adjustment plate, and two sets of drive components. Two-dimensional angle adjustment is achieved through the cooperation of a lead screw, a guide slide, and a V-groove block, and angle variation during locking is reduced by locking the guide slide. However, this structure uses leaf springs to connect and return the adjustment plates. As an elastic component, the leaf spring is prone to fatigue deformation over long-term use, leading to a decrease in positioning accuracy and making it difficult to meet the long-term stable support requirements of large-diameter lenses. Furthermore, its structural design is not optimized for the load-bearing characteristics of large-diameter lenses, resulting in insufficient support rigidity. When bearing large-diameter lenses, it is prone to slight deformation, affecting adjustment accuracy.

[0004] In addition to the above, existing adjustment frames also suffer from several common problems: some multi-degree-of-freedom adjustment structures rely on elastic components for reset or support, which are prone to decreased positioning accuracy due to elastic fatigue after long-term use; some adjustment frames have complex lens mounting structures, cumbersome replacement processes, and poor flexibility in adapting to different specifications of large-aperture lenses; and some adjustment frames have insufficient rigidity in their overall connection structure, making them prone to loosening under vibration, thus failing to guarantee the high-precision positioning stability required for large-aperture lenses. These problems limit the adaptability of existing adjustment frames in high-precision, high-stability applications for large-aperture optical lenses. Therefore, there is an urgent need for a large-aperture optical lens adjustment frame that can balance multi-directional precise adjustment, high-rigidity support, long-term stable positioning, and convenient installation. Utility Model Content

[0005] To solve the above-mentioned technical problems, the purpose of this utility model is to provide an adjustment frame suitable for large-diameter optical lenses.

[0006] This utility model discloses an adjustment frame suitable for large-aperture optical lenses, comprising a frame, a lens frame, a drive assembly, a universal coupling assembly, a first support assembly, and a second support assembly. The frame is constructed from machined and assembled aluminum plates. The lens frame is used to mount the large-aperture optical lens, and a first lens frame flange and a second lens frame flange are respectively mounted on its bottom two sides. The drive assembly is fixed to the frame with screws, and the universal coupling assembly connects the drive assembly and the lens frame at both ends. The first support assembly includes a support base and a first fisheye bearing. The support base is fixed on the frame, and the first fisheye bearing connects the support base to a first frame flange on one side of the frame. The second support assembly includes a linear guide flange, a linear guide, a linear guide seat, and an angular contact ball bearing. The linear guide flange is connected to a second mirror frame flange on the other side of the mirror frame. The linear guide seat is fixed on the frame. The linear guide is fitted onto the linear guide seat. The angular contact ball bearing is mounted on the frame and is adapted to the linear guide.

[0007] Furthermore, in the aforementioned adjustment frame suitable for large-aperture optical lenses, the drive assembly includes a handwheel, a worm gear, a drive shaft, a bushing, and a support frame; the handwheel is connected to the worm gear via a drive mechanism, the power output end of the worm gear is connected to the drive shaft, and the end of the drive shaft away from the worm gear is connected to a universal coupling assembly; the bushing is fitted onto the outside of the drive shaft, and the support frame is fixed to the frame by screws and provides support for the worm gear and the drive shaft; the worm gear is a self-locking worm gear.

[0008] Furthermore, in the aforementioned adjustment frame suitable for large-aperture optical lenses, the number of driving components is two, corresponding to the pitch adjustment direction and the yaw adjustment direction of the lens, respectively; one driving component is used to push one end of the frame to move up and down to achieve pitch adjustment, and the other driving component is used to push the other end of the frame to move left and right to achieve yaw adjustment.

[0009] Furthermore, in the aforementioned adjustment frame suitable for large-aperture optical lenses, a deep groove ball bearing is installed at the mating point between the support frame and the drive shaft. The inner ring of the deep groove ball bearing is fixed to the drive shaft, and the outer ring is fixed to the support frame.

[0010] Furthermore, in the aforementioned adjustment frame suitable for large-aperture optical lenses, the universal coupling assembly includes a coupling, a ball joint rod, and a ball flange; one end of the coupling is fixedly connected to the drive shaft of the drive assembly, and the other end is connected to the ball joint rod; one end of the ball flange is connected to the ball joint rod through a spherical fit, and the other end is fixed to the lens frame.

[0011] Furthermore, in the aforementioned adjustment frame suitable for large-aperture optical lenses, the inner side of the frame is provided with an elastic retaining ring for axially fixing the lens, and the elastic retaining ring is detachably connected to the frame by screws.

[0012] Furthermore, in the aforementioned adjustment bracket suitable for large-diameter optical lenses, the inner ring of the first fisheye bearing of the first support assembly is fixed with an interference fit to the first lens frame flange, and the outer ring of the first fisheye bearing is fixed with a clearance fit to the support seat.

[0013] Furthermore, in the aforementioned adjustment frame suitable for large-aperture optical lenses, the second support assembly further includes a second fisheye bearing, and the second frame flange is connected to the linear guide flange via the second fisheye bearing.

[0014] Furthermore, in the aforementioned adjustment frame suitable for large-aperture optical lenses, the drive assembly, universal coupling assembly, first support assembly, and second support assembly are all rigidly connected to the frame or lens frame via screws.

[0015] Furthermore, in the aforementioned adjustment frame suitable for large-aperture optical lenses, the aluminum plate splicing joint of the frame is provided with a positioning pin, which passes through the corresponding pin holes of two adjacent aluminum plates.

[0016] By means of the above solution, this utility model has at least the following advantages: 1. The frame employs a rigid structure with dual positioning pins for splicing, combined with fully rigid screw connections between the drive assembly, support assembly, frame, and mirror frame. This completely eliminates the use of springs and other elastic components in existing technologies, effectively preventing fatigue damage from long-term use. Simultaneously, the positioning pins and screws at the frame splicing points work together to ensure the overall frame's bending strength and torsional stiffness, significantly improving the long-term stability and service life of the adjustment frame.

[0017] 2. Two sets of drive components are adopted, corresponding to the pitch and yaw adjustment directions respectively. This achieves high-precision control with 0.5mm axial displacement of the drive shaft and 0.01° angle adjustment of the lens for every one revolution of the handwheel. The screw length design allows for an adjustment range of ±12°, solving the problem of limited adjustment range in existing technologies. In addition, the ball joint rod of the universal coupling assembly and the ball joint flange spherical fit can compensate for the deviation of the movement direction between the drive component and the lens frame, avoid jamming during adjustment, and ensure smooth operation.

[0018] 3. The lens is axially clamped on the inside of the frame using an elastic retaining ring and removable screws. Meanwhile, the inner diameter of the frame can be flexibly designed to accommodate different large-diameter lenses, and the frame height is controlled between 15-20mm to ensure that the light transmission range is not obstructed, adapting to the installation needs of various large-diameter optical lenses.

[0019] 4. By rationally controlling the thickness and flatness of individual plates, the frame achieves a lightweight design while ensuring the accuracy of the installation reference, meeting the weight requirements of optical equipment. The drive components support flexible replacement of power inputs, allowing for the selection of handwheels or stepper motors as needed, making it widely applicable.

[0020] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of an adjustment frame suitable for large-diameter optical lenses.

[0022] Figure 2 This is a schematic diagram of the back structure of an adjustment bracket suitable for large-diameter optical lenses.

[0023] Figure 3 This is a schematic diagram of the driving component.

[0024] Figure 4 This is a structural schematic diagram of a universal coupling assembly.

[0025] Figure 5 This is a structural schematic diagram of the first support component.

[0026] Figure 6 This is a structural diagram of the supporting component.

[0027] The meanings of the labels in the figures are as follows.

[0028] Detailed Implementation The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0029] like Figures 1 to 6This adjustment frame, suitable for large-aperture optical lenses, includes a frame 1, a lens frame 2, a drive assembly 3, a universal coupling assembly 4, a first support assembly 5, and a second support assembly 6. Its unique feature is that the frame 1 is made of 6061-T6 aluminum alloy plates, CNC milled and then assembled. The thickness of each aluminum plate is set to 15-20mm according to the load-bearing requirements, and the flatness of the machined aluminum plates is controlled within 0.01mm to ensure installation accuracy. Simultaneously, 8mm diameter locating pin holes can be machined at the joints before inserting locating pins. The length of the locating pins is 2-3mm longer than the total thickness of the two adjacent aluminum plates. After passing through the pin holes in the two aluminum plates, the aluminum plates are fixed with M8 socket head cap screws to form an integral frame. This structure ensures the bending strength of the frame 1. Furthermore, the lens frame 2 is a ring-shaped frame structure, which can also be made of aluminum alloy through integral forging and CNC milling. Its inner diameter matches the outer diameter of the large-aperture optical lens. For example, if the lens diameter is 200mm, the inner diameter of frame 2 is set to 200.05mm. The frame height is 15-20mm to ensure that it does not obstruct the light transmission range of the lens. The first frame flange 51 and the second frame flange 61 are fixed to the bottom sides of frame 2 respectively with M6 socket head cap screws. Both flanges are circular plates with a gap of ≤0.01mm when fitting with the bottom of frame 2 to avoid wobbling after connection. During processing, four M5 threaded holes (hole spacing 90°) are evenly opened along the circumference of the inner side of frame 2, and a 65Mn spring steel elastic pressure ring with a thickness of 3mm and an inner diameter of 198mm is installed. A waist-shaped hole is opened at the position of the threaded hole on the elastic pressure ring, and the elastic pressure ring is fixed to the inner side of frame 2 with M5 socket head cap countersunk screws. In this way, when the screw is tightened, the elastic pressure ring will produce a slight deformation of 0.1-0.2mm, which can axially press the lens and prevent the lens from loosening. Furthermore, the screws are removable, making it easy to install and replace the lens.

[0030] According to a preferred embodiment of this utility model, two sets of drive components 3 are used, respectively installed at the upper and lower ends of the frame 1, corresponding to the tilt and yaw adjustment directions of the lens. Each set of drive components 3 may include a handwheel 35, a worm gear 31, a drive shaft 33, a bushing 32, a support frame 34, and a deep groove ball bearing, as needed. Specifically, the handwheel 35 is a circular disc made of ABS engineering plastic, and its center is fixed to the worm end of the worm gear 31 via a key connection. Anti-slip textures can be provided on the edge of the handwheel 35 to facilitate the operator's rotation. At the same time, the worm gear 31 is a self-locking structure, and the center of the worm gear is fixed to one end of the drive shaft 33 via a flat key to ensure lossless power transmission. Furthermore, the length of the drive shaft 33 is set to 100-150mm according to the adjustment range, and the bushing 32 is fitted on the outside of the drive shaft 33, with one end fitting into the inner hole of the support frame 34, and the other end extending to the connection end between the drive shaft 33 and the coupling 41, serving as a guide and dustproof function.

[0031] Furthermore, the support frame 34 used in this invention has a U-shaped structure. Its bottom is fixed to the pre-set mounting surface of the frame 1 by M8 hexagon socket head cap screws. Bearing holes are respectively opened on the top and side for installing deep groove ball bearings. The inner ring of the deep groove ball bearing is interference-fitted with the drive shaft 33, and the outer ring is clearance-fitted with the bearing hole of the support frame 34. This reduces frictional loss when the drive shaft 33 rotates. At the same time, the drive shaft 33 of the upper drive assembly 3 is axially vertical. After power output, it pushes the upper end of the lens frame 2 to move up and down, realizing the pitch adjustment of the lens within a range of ±10°. The drive shaft 33 of the lower drive assembly 3 is axially horizontal. After power output, it pushes the lower end of the lens frame 2 to move left and right, realizing the yaw adjustment of the lens within a range of ±10°.

[0032] In practical implementation, the universal coupling assembly 4 connects the drive assembly 3 and the mirror frame 2. Each assembly includes a coupling 41, a ball joint rod 42, and a ball joint flange 43, used to compensate for deviations in the movement direction of the two components and prevent jamming. Simultaneously, one end of the coupling 41 is fixed to the end of the drive shaft 33 away from the worm gear 31 using an internal hexagonal screw, and the other end is fixed to the rod of the ball joint rod 42 using an internal hexagonal screw. Furthermore, the claw part of the coupling 41 is preferably made of 45# steel combined with a nitrile rubber buffer pad to reduce transmission impact. The ball joint rod 42 has a ball head diameter of 15mm, and the ball joint flange 43 is an L-shaped plate with an inner spherical groove at one end, which mates with the spherical surface of the ball head of the ball joint rod 42, allowing the ball joint rod 42 to rotate at multiple angles within a range of ±5° relative to the ball joint flange 43. The other end of the ball joint flange 43 is fixed to the side of the mirror frame 2 using an M6 internal hexagonal head screw, ensuring smooth power transmission.

[0033] Meanwhile, the first support assembly 5 is installed on the left side of the frame 1, including a support base 53 and a first fisheye bearing 52, used to support the mirror frame 2 and provide rotational freedom. Specifically, the support base 53 is a cuboid structure, its bottom is fixed to the frame 1 by M6 socket head cap screws, and a stepped hole is opened at the top for installing the first fisheye bearing 52. The inner ring of the first fisheye bearing 52 is interference-fitted with the first mirror frame flange 51, and the outer ring is clearance-fitted with the stepped hole at the top of the support base 53. The inner ring of the first fisheye bearing 52 moves synchronously with the first mirror frame flange 51, and the outer ring is fixed to the support base 53. In this way, the translational movement of the mirror frame 2 in the horizontal and vertical directions is restricted, while the rotation of the mirror frame 2 around the axis of the first fisheye bearing 52 is allowed, providing the necessary degree of freedom for adjustment.

[0034] Furthermore, the second support assembly 6 is installed on the right side of the frame 1, including a linear guide flange 63, a linear guide 64, a linear guide seat 65, an angular contact ball bearing 66, and a second fisheye bearing (62), used to support the mirror frame 2 and cooperate with the first support assembly 5 to achieve smooth adjustment. Specifically, the selected linear guide seat 65 is a long strip structure, with the bottom fixed to the frame 1 by M6 hexagon socket head cap screws, and a sliding groove on the top to cooperate with the linear guide 64. At the same time, the second mirror frame flange (61) is connected to the linear guide flange (63) through the second fisheye bearing (62). The angular contact ball bearing 66 is installed on the frame 1 through a bearing seat, with the outer ring of the bearing in contact with the side of the linear guide 64, forming lateral support for the linear guide 64 during the sliding process, preventing the linear guide 64 from tilting, and ensuring support stability.

[0035] With the above structure, the second support component 6 cooperates with the first support component 5 to allow the frame 2 to rotate around the axis of the first fisheye bearing 52 of the first support component 5. At the same time, the sliding of the linear guide 64 adapts to the pitch and yaw displacement of the frame 2, avoiding structural interference during adjustment.

[0036] Considering the overall stability of the connections, in this invention, the support frame 34 of the drive assembly 3, the support seat 53 of the first support assembly 5, and the linear guide seat 65 of the second support assembly 6 are all fixed to the frame 1 with screws. The ball joint flange 43 of the universal coupling assembly 4, the first fisheye bearing 52 of the first support assembly 5, and the linear guide flange 63 of the second support assembly 6 are all fixed to the frame 2 with screws. All connections are rigid connections, without springs, rubber, or other elastic connecting parts, avoiding fatigue damage to elastic components after long-term use.

[0037] During use, the adjustment range is determined by the screw length of the worm gear 31 in the drive assembly 3. When the screw length is 120mm, the pitch and yaw adjustment ranges both reach ±12°. The adjustment accuracy is determined by the transmission ratio of the worm gear 31: the transmission ratio is 1:40, and for every 360° rotation of the handwheel 35, the axial displacement of the drive shaft 33 is 0.5mm, corresponding to an angle adjustment accuracy of 0.01° for the lens, meeting the precision adjustment requirements of large-aperture optical lenses.

[0038] Furthermore, the power input of drive component 3 is replaceable. By removing handwheel 35 and connecting a stepper motor via a coupling, the motor signal terminal can be connected to a PLC controller to achieve automated adjustment. The adjustment efficiency is increased to more than 5 times that of manual adjustment, making it suitable for mass production or automated optical system applications.

[0039] Furthermore, the directions or positional relationships described in this utility model are based on the directions or positional relationships shown in the accompanying drawings. They are only for the purpose of facilitating the description of this utility model and simplifying the description, and are not intended to indicate or imply that the device or structure referred to must have a specific orientation, or to operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An adjustment frame suitable for large-diameter optical lenses, comprising a frame (1), a lens frame (2), a drive assembly (3), a universal coupling assembly (4), a first support assembly (5), and a second support assembly (6), characterized in that: The frame (1) is made of aluminum plates; the lens frame (2) is used to install large-diameter optical lenses, and the bottom two sides are respectively equipped with a first lens frame flange (51) and a second lens frame flange (61); the drive assembly (3) is fixed to the frame (1) by screws, and the two ends of the universal coupling assembly (4) are respectively connected to the drive assembly (3) and the lens frame (2). The first support assembly (5) includes a support base (53) and a first fisheye bearing (52). The support base (53) is fixed on the frame (1), and the first fisheye bearing (52) connects the support base (53) and the first frame flange (51) on one side of the frame (2). The second support assembly (6) includes a linear guide flange (63), a linear guide (64), a linear guide seat (65), and an angular contact ball bearing (66). The linear guide flange (63) is connected to the second mirror frame flange (61) on the other side of the mirror frame (2). The linear guide seat (65) is fixed on the frame (1). The linear guide (64) is fitted on the linear guide seat (65). The angular contact ball bearing (66) is mounted on the frame (1) and adapted to the linear guide (64).

2. The adjustment frame for large-aperture optical lenses according to claim 1, characterized in that: The drive assembly (3) includes a handwheel (35), a worm gear (31), a drive shaft (33), a bushing (32), and a support frame (34). The handwheel (35) is connected to the worm gear (31) for transmission. The power output end of the worm gear (31) is connected to the drive shaft (33). The end of the drive shaft (33) away from the worm gear (31) is connected to the universal coupling assembly (4). The bushing (32) is fitted on the outside of the drive shaft (33). The support frame (34) is fixed to the frame (1) by screws and provides support for the worm gear (31) and the drive shaft (33). The worm gear (31) is a self-locking worm gear.

3. The adjustment frame for large-aperture optical lenses according to claim 2, characterized in that: The number of drive components (3) is two, corresponding to the pitch adjustment direction and the yaw adjustment direction of the lens respectively; one drive component (3) is used to push one end of the frame (2) to move up and down to achieve pitch adjustment, and the other drive component (3) is used to push the other end of the frame (2) to move left and right to achieve yaw adjustment.

4. The adjustment frame for large-aperture optical lenses according to claim 2, characterized in that: A deep groove ball bearing is installed at the joint between the support frame (34) and the drive shaft (33). The inner ring of the deep groove ball bearing is fixed to the drive shaft (33), and the outer ring is fixed to the support frame (34).

5. The adjustment frame for large-aperture optical lenses according to claim 1, characterized in that: The universal coupling assembly (4) includes a coupling (41), a ball joint rod (42), and a ball joint flange (43); one end of the coupling (41) is fixedly connected to the drive shaft (33) of the drive assembly (3), and the other end is connected to the ball joint rod (42); one end of the ball joint flange (43) is connected to the ball joint rod (42) through a spherical fit, and the other end is fixed to the mirror frame (2).

6. The adjustment frame for large-aperture optical lenses according to claim 1, characterized in that: The inner side of the frame (2) is provided with an elastic pressure ring for axially fixing the lens. The elastic pressure ring is detachably connected to the frame (2) by screws.

7. The adjustment frame for large-aperture optical lenses according to claim 1, characterized in that: The inner ring of the first fisheye bearing (52) of the first support assembly (5) is fixed with the first mirror frame flange (51) by interference fit, and the outer ring of the first fisheye bearing (52) is fixed with the support seat (53) by clearance fit.

8. The adjustment frame for large-aperture optical lenses according to claim 1, characterized in that: The second support assembly (6) also includes a second fisheye bearing (62), and the second mirror frame flange (61) is connected to the rail flange (63) through the second fisheye bearing (62).

9. The adjustment frame for large-aperture optical lenses according to claim 1, characterized in that: The drive assembly (3), universal coupling assembly (4), first support assembly (5) and second support assembly (6) are all rigidly connected to the frame (1) or the mirror frame (2) by screws.

10. The adjustment frame for large-aperture optical lenses according to claim 1, characterized in that: The aluminum plate splicing joint of the frame (1) is provided with a positioning pin, which passes through the corresponding pin hole of two adjacent aluminum plates.

Images