An adjusting mechanism and method for precise adjustment of wedge angle direction of a wedge-shaped lens
Patent Information
- Application Number
- CN202611117988.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-07-27
- Publication Date
- 2026-10-20
AI Technical Summary
然而，在实际装调过程中，楔角的实际安装方向（即楔面最高点指向最低点的矢量方向）往往与光学设计值存在角度偏差，导致后续光路的指向性错误，直接降低系统信噪比
[0019]本发明未提及的技术均参照现有技术。
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Abstract
Description
Technical Field
[0001] This invention relates to an adjustment mechanism and method for precise adjustment of the wedge angle direction of a wedge lens, belonging to the technical field of wedge lens adjustment. Background Technology
[0002] In complex optical systems, stray light often affects optical performance (e.g., causing interference fringe distortion or measurement errors). Therefore, beam splitters are often designed in a wedge shape to reduce the influence of stray light and thus improve the accuracy and effectiveness of optical measurements.
[0003] Wedge-shaped lenses effectively utilize the spatial separation of wedge-face reflection and plane reflection. However, in actual assembly and adjustment, the actual installation direction of the wedge angle (i.e., the vector direction from the highest point of the wedge surface to the lowest point) often deviates from the optical design value, leading to directional errors in the subsequent optical path and directly reducing the system's signal-to-noise ratio. Using an altimeter to test the high and low points of the wedge lens presents the problem of excessive measurement error, making it impossible to determine the exact positions of the high and low points. Using a theodolite for assembly and adjustment suffers from drawbacks such as cumbersome testing methods, numerous steps, low efficiency, and large equipment footprint. Therefore, there is an urgent need to develop a technology to improve the accuracy of the wedge angle installation direction to meet the requirements of high-precision optical systems. Summary of the Invention
[0004] This invention provides an assembly and adjustment mechanism and method for precise adjustment of the wedge angle direction of a wedge lens, which achieves rapid and high-precision positioning of the wedge angle direction of the wedge lens and ensures that the wedge angle direction of the wedge lens is highly consistent with the design direction.
[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: An adjustment mechanism for precise adjustment of the wedge angle direction of a wedge lens includes: a clamping frame, a cubic prism, and a wedge lens assembly; The clamping frame includes a base plate, a first side plate, a second side plate, and an adjusting bolt. The first and second side plates are parallel and opposite to each other on both sides of the base plate, forming a groove structure. The upper surface of the base plate connected to the first side plate is provided with a first limiting step, and the part of the upper surface of the base plate between the first and second side plates, excluding the first limiting step, is defined as a platform. The second side plate is provided with a threaded hole, and the adjusting bolt is threaded into the threaded hole. The lower surface of the base plate is provided with a connecting boss. The cube prism is movably placed on the platform, and the bottom of one side of the cube prism is in contact with the side wall of the first limiting step; the upper surface of the cube prism and the side of the cube prism facing the second side plate (or the side of the cube prism facing the first side plate) form an orthogonal optical reference plane, which serves as the reference transmission carrier for wedge angle orientation determination. The wedge mirror assembly includes a wedge mirror base and a wedge mirror; the wedge mirror is installed inside the wedge mirror base; a second limiting step is provided on one side of the bottom of the wedge mirror base, and the part of the bottom of the wedge mirror base other than the second limiting step is a flat reference surface; the wedge mirror base is movably placed on the orthogonal optical reference surface and is movably engaged with the edge of the cube prism by the second limiting step, the flat reference surface is in contact with the upper surface of the cube prism, and the side of the second limiting step is in contact with the side wall of the cube prism, so that the flat reference surface of the wedge mirror base is parallel or perpendicular to the orthogonal optical reference surface of the cube prism; the adjusting bolt is used to push the cube prism.
[0006] The two sides of the aforementioned cubic prism, the first side plate, the second side plate, and the side of the first limiting step are all parallel to each other.
[0007] The aforementioned cubic prism and the first limiting step are fitted at right angles to ensure stability and assembly accuracy.
[0008] The aforementioned assembly and adjustment mechanism for precise adjustment of the wedge angle direction of the wedge lens is used in conjunction with a central instrument. When the central instrument is switched to the repeaterless imaging mode, the central instrument imaging screen generates an orthogonal X / Y coordinate axis reference, which is used to acquire the reflected cross image of the cube prism and the wedge surface of the wedge lens.
[0009] By employing the aforementioned assembly and adjustment mechanism for precise adjustment of the wedge angle direction of the wedge lens, rapid and high-precision positioning of the wedge angle direction of the wedge lens can be achieved, ensuring that the wedge angle direction of the wedge lens is highly consistent with the design direction.
[0010] The axial direction of the aforementioned threaded hole is parallel to the upper surface of the base plate.
[0011] For ease of connection, the aforementioned connecting boss is cylindrical.
[0012] To facilitate pushing the cube prism, the threaded hole is positioned directly opposite the top of the cube prism's side wall.
[0013] To improve stability during use, the height of the first limiting step is 1-2 mm. Too high a step will cause slippage during the jacking process, while too low a step will fail to provide adequate limiting. The aforementioned height of the first limiting step refers to the height of its top surface relative to the top surface of the base plate.
[0014] To better meet the adjustment and assembly requirements, the width of the first limit step is 3~8mm.
[0015] To further improve the accuracy and precision of assembly, the surface of the cube prism is coated with a visible light reflective film to achieve a clearer image; the parallelism tolerance of the four edges of the cube prism is ≤0.02mm to achieve higher precision; the form and position tolerance of the six faces of the cube prism is ≤0.02mm to achieve higher assembly precision; the flatness tolerance of the upper surface of the base plate is ≤0.02mm, which allows for a better fit with the prism and prevents wobbling.
[0016] A method for precisely adjusting the wedge angle direction of a wedge lens includes the following steps: S1: Clamp the connecting boss at the bottom of the clamping frame onto the three-jaw chuck of the center instrument, and put the center instrument into repeaterless mode. S2: Place the cube prism on the platform of the clamping frame, with one bottom side of the cube prism in contact with the side wall of the first limiting step. Coarsely adjust the air-bearing tilting stage of the centering instrument so that the reflected cross image on the top surface of the cube prism is located in the central field of view. Record the XY coordinate values of the current cross image as the reference coordinates. S3: Rotate the adjusting bolt to tilt the cube prism toward the first side plate, observe the direction of cross image offset, rotate the air-bearing tilting stage to make the direction of cross image offset parallel to the X-axis, and eliminate small angular deviations. This step requires repeated calibration and confirmation to ensure that the previous operations were correct. S4: The wedge-shaped mirror base is movably placed on the orthogonal optical reference surface of the cube prism and is movably engaged with the edge of the cube prism through the second limiting step. The flat reference surface is attached to the upper surface of the cube prism, the side of the second limiting step is attached to the side wall of the cube prism, and the wedge-shaped mirror is embedded in the wedge-shaped mirror base. S5: Observe the reflected cross image on the wedge surface of the wedge lens within the field of view of the central instrument. Rotate the wedge lens until the cross image falls on the X-axis or Y-axis, so that the wedge angle direction is consistent with the theoretical design direction. Lock the wedge lens mount limiting structure to complete the wedge angle direction adjustment of the wedge lens. The cross image falls on the positive and negative directions of the X-axis corresponding to the left and right orientation of the wedge angle, and the cross image falls on the positive and negative directions of the Y-axis corresponding to the front and back orientation of the wedge angle. The installation and adjustment error of the wedge angle direction of the wedge mirror in S5 above is ≤0.2 arcminutes.
[0017] The center instrument comes with a 360° rotatable air-float tilting stage, a three-jaw chuck, and other features.
[0018] This application, through the central instrument setup and adjustment, rotates the lens to ensure that the line connecting the observation plane and the reflected image of the wedge surface remains parallel or perpendicular to the reference plane. When the lens is rotated to the theoretical position, the reflected image of the wedge surface is visually represented on the screen along the X-axis or Y-axis. Positive or negative values on the XY coordinate axes represent the wedge angle pointing left or right, or up or down. This ensures that the direction error between the wedge angle and the reference plane is less than 0.2 minutes.
[0019] Any techniques not mentioned in this invention are based on existing technologies.
[0020] This invention relates to an assembly and adjustment mechanism and method for precise adjustment of the wedge angle direction of a wedge lens. It achieves rapid and high-precision positioning of the wedge angle direction of the wedge lens, ensuring that the wedge angle direction of the wedge lens is highly consistent with the design direction. It is simple, easy to operate, has a clear process, is easy to standardize, has low cost, high efficiency, high precision, and an error of less than 0.2 arcminutes. Attached Figure Description
[0021] Figure 1 This is a perspective view of the mounting and adjusting mechanism for precise adjustment of the wedge angle direction of a wedge lens according to the present invention; Figure 2 A cross-sectional view of the assembly and adjustment mechanism for precise adjustment of the wedge angle direction of a wedge lens according to the present invention; Figure 3 The cross-shaped image reflected from the wedge surface of the wedge-shaped lens within the field of view of the central instrument; In the figure, 1 is the clamping frame, 11 is the base plate, 12 is the first side plate, 13 is the second side plate, 14 is the first limiting step, 15 is the connecting boss, 2 is the cubic prism, 3 is the wedge-shaped mirror base, 31 is the second limiting step, 4 is the wedge-shaped mirror, and 5 is the adjusting bolt. Detailed Implementation
[0022] To better understand the present invention, the following embodiments further illustrate the content of the present invention, but the content of the present invention is not limited to the following embodiments.
[0023] The directional terms used in this application, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," are based on the orientation or positional relationship shown in the accompanying drawings or in the usage state, and are only for the convenience of describing this application. They are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application.
[0024] Example 1
[0025] like Figure 1-2 As shown, an adjustment mechanism for precise adjustment of the wedge angle direction of a wedge lens includes: a clamping frame, a cubic prism, and a wedge lens assembly; The clamping frame includes a base plate, a first side plate, a second side plate, and an adjusting bolt. The first and second side plates are parallel and opposite to each other on both sides of the base plate, forming a groove structure. The upper surface of the base plate connected to the first side plate is provided with a first limiting step, and the part of the upper surface of the base plate between the first and second side plates, excluding the first limiting step, is defined as a platform. The second side plate is provided with a threaded hole, and the adjusting bolt is threaded into the threaded hole. The lower surface of the base plate is provided with a connecting boss. The cube prism is movably placed on the platform, and the bottom of one side of the cube prism is in contact with the side wall of the first limiting step; the upper surface of the cube prism and the side facing the second side plate constitute an orthogonal optical reference plane, which serves as the reference transmission carrier for wedge angle orientation determination. The wedge mirror assembly includes a wedge mirror base and a wedge mirror; the wedge mirror is installed inside the wedge mirror base; a second limiting step is provided on one side of the bottom of the wedge mirror base, and the part of the bottom of the wedge mirror base other than the second limiting step is a flat reference surface; the wedge mirror base is movably placed on the orthogonal optical reference surface and is movably engaged with the edge of the cube prism by the second limiting step, the flat reference surface is in contact with the upper surface of the cube prism, and the side of the second limiting step is in contact with the side wall of the cube prism, so that the flat reference surface of the wedge mirror base is parallel or perpendicular to the orthogonal optical reference surface of the cube prism; the adjusting bolt is used to push the cube prism.
[0026] Example 2
[0027] Based on Example 1, the following improvements were made: an adjustment mechanism for precise adjustment of the wedge angle direction of the wedge lens is used in conjunction with a central instrument. When the central instrument is switched to the repeaterless imaging mode, the central instrument imaging screen generates an orthogonal X / Y coordinate axis reference, which is used to acquire the reflected cross image of the cube prism and the wedge surface of the wedge lens.
[0028] Example 3
[0029] Based on Embodiment 2, the following improvements were made: the axial direction of the threaded hole is parallel to the upper surface of the base plate, and the threaded hole is directly opposite the top of the side wall of the cubic prism. For ease of connection, the connecting boss is cylindrical.
[0030] Example 4
[0031] Based on Example 3, the following improvements were made: To improve stability, the height of the first limiting step is 1.5mm. Too high a step will cause slippage during the jacking process, while too low a step will not provide adequate limiting. The aforementioned height of the first limiting step refers to the height of the top surface of the first limiting step relative to the upper surface of the base plate.
[0032] To better meet the adjustment requirements, the width of the first limiting step is 4.5mm. The height of the second limiting step is 2mm, and the width is 15mm.
[0033] In this example, the surface of the cube prism is coated with a visible light reflective film; the parallelism tolerance of the four edges of the cube prism is ≤0.02mm; the form and position tolerances of the six faces of the cube prism are all ≤0.02mm; and the flatness tolerance of the upper surface of the base plate is ≤0.02mm.
[0034] A method for precisely adjusting the wedge angle direction of a wedge lens includes the following steps: S1: Clamp the connecting boss at the bottom of the clamping frame onto the three-jaw chuck of the center instrument, and put the center instrument into repeaterless mode. S2: Place the cube prism on the platform of the clamping frame, with one bottom side of the cube prism in contact with the side wall of the first limiting step. Coarsely adjust the air-bearing tilting stage of the centering instrument so that the reflected cross image on the top surface of the cube prism is located in the central field of view. Record the XY coordinate values of the current cross image as the reference coordinates. S3: Rotate the adjusting bolt to tilt the cube prism toward the first side plate, observe the direction of cross image offset, rotate the air-bearing tilting stage to make the direction of cross image offset parallel to the X-axis, and eliminate small angular deviations. This step requires repeated calibration and confirmation to ensure that the previous operations were correct. S4: The wedge-shaped mirror base is movably placed on the orthogonal optical reference surface of the cube prism and is movably engaged with the edge of the cube prism through the second limiting step. The flat reference surface is attached to the upper surface of the cube prism, the side of the second limiting step is attached to the side wall of the cube prism, and the wedge-shaped mirror is embedded in the wedge-shaped mirror base. S5: Observe the reflected cross image on the wedge surface of the wedge lens within the field of view of the central instrument. Rotate the wedge lens until the cross image falls on the X-axis or Y-axis, so that the wedge angle direction is consistent with the theoretical design direction. Lock the wedge lens mount limiting structure to complete the wedge angle direction adjustment of the wedge lens. The cross image falls on the positive and negative directions of the X-axis corresponding to the left and right orientation of the wedge angle, and the cross image falls on the positive and negative directions of the Y-axis corresponding to the front and back orientation of the wedge angle.
[0035] The continuous assembly of 50 Φ38.1mm planar wedge beam splitters resulted in an average wedge angle error of 0.08 arcminutes and a maximum error of 0.13 arcminutes. The average assembly and adjustment time per splitter was 1.4 minutes. The average attenuation of stray light in the optical path was 42.3%. Efficiency was improved by 90%, and the difficulty of operation was reduced by 90%. Accuracy was improved by 2 times.
[0036] Comparative Example 1
[0037] Unlike Example 4, S1 is omitted, and the rest is the same as in Example 4. This will cause the mirror mount to tilt or loosen, making it impossible to find the reflected image or causing the reference position to move during operation.
[0038] Comparative Example 2
[0039] Unlike Example 4, S2 is omitted, and the rest is the same as in Example 4. This will result in a lack of reference for subsequent assembly and adjustment, making it impossible to make the reflected image of the wedge lens coincide with the crosshair on the screen of the eccentricity instrument, and making it impossible to determine whether the movement direction of the reflected image is consistent with the X-axis direction.
[0040] Comparative Example 3
[0041] Unlike Example 4, S3 is omitted, and the rest is the same as in Example 4. Subsequently, it was not possible to find a suitable position so that the direction of movement of the reflected image of the wedge lens was parallel to the X-axis.
[0042] Comparative Example 4
[0043] The difference from Example 4 is that the design of the second limiting step and related steps in S4 are omitted, while the rest are the same as in Example 4. This will result in a lack of continuity in the reference, with the initial reference not coinciding with the mirror base reference, causing the assembly and adjustment to fail.
[0044] Comparative Example 5
[0045] The difference from Example 4 is that S5 is omitted, and the rest are the same as in Example 4. If the reflected image of the wedge mirror is not on the X-axis or Y-axis, it will cause the wedge angle direction to be neither perpendicular nor parallel to the reference direction. If the reflected image of the wedge mirror is on the X-axis or Y-axis but is opposite in sign to the theoretical value, it will cause the wedge angle direction of the wedge mirror to be opposite to the required theoretical value direction.
[0046] As can be seen from the above, each step in this application is indispensable and is a concise and necessary step. Furthermore, it is necessary to confirm whether there are any errors in the operation during the process.
Claims
1. An adjustment mechanism for precise adjustment of the wedge angle direction of a wedge lens, characterized in that: It can control the orthogonal direction of the wedge angle with respect to the mirror mount, including: a clamping frame, a cubic prism, and a wedge mirror assembly; The clamping frame includes a base plate, a first side plate, a second side plate, and an adjusting bolt. The first and second side plates are parallel and opposite to each other on both sides of the base plate, forming a groove structure. The upper surface of the base plate connected to the first side plate is provided with a first limiting step. The upper surface of the base plate between the first and second side plates, excluding the first limiting step, is defined as a platform. The second side plate is provided with a threaded hole, and the adjusting bolt is threaded into the threaded hole. The lower surface of the base plate is provided with a connecting boss. The cube prism is movably placed on the platform, and the bottom of one side of the cube prism is in contact with the side wall of the first limiting step; the upper surface of the cube prism and the side facing the second side plate or the first side plate constitute an orthogonal optical reference plane, which serves as a reference transmission carrier for wedge angle orientation determination. The wedge mirror assembly includes a wedge mirror base and a wedge mirror; the wedge mirror is installed inside the wedge mirror base; a second limiting step is provided on one side of the bottom of the wedge mirror base, and the part of the bottom of the wedge mirror base other than the second limiting step is a flat reference surface; the wedge mirror base is movably placed on the orthogonal optical reference surface and is movably engaged with the edge of the cube prism by the second limiting step, the flat reference surface is in contact with the upper surface of the cube prism, and the side of the second limiting step is in contact with the side wall of the cube prism, so that the flat reference surface of the wedge mirror base is parallel or perpendicular to the orthogonal optical reference surface of the cube prism; the adjusting bolt is used to push the cube prism.
2. The adjustment mechanism for precise adjustment of the wedge angle direction of a wedge lens according to claim 1, characterized in that: When used with a central instrument, the central instrument switches to the repeaterless imaging mode, and the central instrument imaging screen generates an orthogonal X / Y coordinate axis reference, which is used to acquire the reflected cross image of the cube prism and the wedge surface of the wedge mirror.
3. The adjustment mechanism for precise adjustment of the wedge angle direction of a wedge lens according to claim 1 or 2, characterized in that: The axial direction of the threaded hole on the second side plate is parallel to the upper surface of the base plate.
4. The mounting and adjusting mechanism for precise adjustment of the wedge angle direction of a wedge lens according to claim 1 or 2, characterized in that: The threaded hole is directly opposite the top of the side wall of the cube prism.
5. The adjustment mechanism for precise adjustment of the wedge angle direction of a wedge lens according to claim 1 or 2, characterized in that: The connecting boss is cylindrical.
6. The mounting and adjusting mechanism for precise adjustment of the wedge angle direction of a wedge lens according to claim 1 or 2, characterized in that: The height of the first limiting step is 1~2mm.
7. The mounting and adjusting mechanism for precise adjustment of the wedge angle direction of a wedge lens according to claim 1 or 2, characterized in that: The width of the first limiting step is 3~8mm.
8. The surface of the cube prism is coated with a visible light reflective film; the parallelism tolerance of the four edges of the cube prism is ≤0.02mm; the form and position tolerances of the six faces of the cube prism are all ≤0.02mm; the flatness tolerance of the upper surface of the base plate is ≤0.02mm.
9. A method for adjusting a wedge lens using the adjusting mechanism for precise adjustment of the wedge angle direction as described in any one of claims 2-8, characterized in that, Includes the following steps: S1: Clamp the connecting boss at the bottom of the clamping frame onto the three-jaw chuck of the center instrument, and put the center instrument into repeaterless mode. S2: Place the cube prism on the platform of the clamping frame, with one bottom side of the cube prism in contact with the side wall of the first limiting step. Coarsely adjust the air-bearing tilting stage of the centering instrument so that the reflected cross image on the top surface of the cube prism is located in the central field of view. Record the XY coordinate values of the current cross image as the reference coordinates. S3: Rotate the adjusting bolt to tilt the cube prism toward the first side plate, observe the direction of cross image offset, and rotate the air-bearing tilting stage to move the direction of cross image offset along the positive or negative X-axis and onto the X-axis to eliminate small angular deviations. S4: The wedge-shaped mirror base is movably placed on the orthogonal optical reference surface of the cube prism and is movably engaged with the edge of the cube prism through the second limiting step. The flat reference surface is attached to the upper surface of the cube prism, the side of the second limiting step is attached to the side wall of the cube prism, and the wedge-shaped mirror is embedded in the wedge-shaped mirror base. S5: Observe the reflected cross image on the wedge surface of the wedge lens within the field of view of the central instrument. Rotate the wedge lens until the cross image falls on the X-axis or Y-axis, so that the wedge angle direction is consistent with the theoretical design direction. Lock the wedge lens mount limiting structure to complete the wedge angle direction adjustment of the wedge lens. Among them, the cross image falls on the positive and negative directions of the X-axis corresponding to the left and right orientation of the wedge angle, and the cross image falls on the positive and negative directions of the Y-axis corresponding to the front and back orientation of the wedge angle.
10. The assembly and adjustment method for precise adjustment of the wedge angle direction of a wedge lens according to claim 9, characterized in that: The installation and adjustment error of the wedge angle direction of the S5 wedge mirror is ≤0.2 arcminutes.