Cassette optical system secondary mirror assembly positioning apparatus and method
Patent Information
- Application Number
- CN202610902130.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-06-23
- Publication Date
- 2026-10-16
AI Technical Summary
调试步骤繁多：由于初始位置偏离理论零位过大，调试人员需要在多个自由度上（轴向、径向、倾斜）进行大范围的搜索与补偿，无法快速收敛到最佳像质点
本申请设计的卡式主次镜轴向、径向理论零位定位装置，提供了一种简单、快捷的确定次镜相对于主镜的理论零位的装调方法，提供对次镜理论设计零位（即轴向距离、径向对中及倾角均与设计值一致的理论位置）的精准标定，解决次镜相对于主镜进行精密的光学调试前，次镜相对于主镜初始安装位置和理论位置差异大的带来的调试问题，可以很大程度上减少光学精密调试前期的调试工作量，提高调试效率。
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Figure CN122923202A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of optical device technology, and in particular to a positioning device and method for a secondary mirror assembly of a cassette optical system. Background Technology
[0002] Cassegrain optical systems are widely used in optical equipment due to their ability to effectively fold the optical path. A Cassegrain optical system uses the combination of primary and secondary mirrors to create a folded optical path structure.
[0003] During the assembly and adjustment of a cassette optical system, the final spatial pose of the secondary mirror relative to the primary mirror (including axial distance, radial translation, and tilt angle) determines the imaging quality of the entire system. In the optical (imaging) debugging stage, to achieve high-precision assembly, existing technologies typically employ optical equipment such as laser interferometers to precisely adjust the axial distance, radial translation, and tilt angle between the secondary and primary mirrors.
[0004] However, before the aforementioned precision optical adjustment, the initial position of the secondary mirror relative to the primary mirror is usually determined rather arbitrarily, resulting in low positional accuracy between the secondary mirror and the primary mirror. This leads to numerous, difficult, and inefficient preliminary adjustment steps when performing optical adjustments directly.
[0005] Specifically, the current conventional practice is to roughly install the secondary mirror inside the primary mirror tube based on experience or rough mechanical positioning. Therefore, the initial position is determined rather arbitrarily, and after actual installation, the actual initial position of the secondary mirror often deviates significantly from the theoretically designed position in terms of axial deviation, radial offset, or tilt. This leads to the following problems: The debugging process is complex: because the initial position deviates too much from the theoretical zero point, the debugging personnel need to perform extensive searches and compensations in multiple degrees of freedom (axial, radial, and tilt), and cannot quickly converge to the optimal image point.
[0006] Increased debugging difficulty: Axial distance error introduces spherical aberration, and radial offset introduces coma. These aberrations are coupled with each other, increasing the complexity of judging the adjustment direction and requiring a high level of experience from the debugging personnel.
[0007] Low debugging efficiency: The entire precision debugging process requires repeated adjustments, measurements, and calculations, which consumes a lot of time and manpower, and is not conducive to mass production or rapid on-orbit reconfiguration. Summary of the Invention
[0008] To address the shortcomings of the prior art, this invention provides a positioning device and method for a secondary lens assembly in a cassette optical system, employing the following technical solution: In one aspect, a secondary mirror assembly positioning device for a cassette optical system is provided, which is used to install the secondary mirror assembly relative to the primary mirror assembly to an initial installation position at the theoretical zero position in the axial and radial directions, so as to facilitate optical adjustment; The primary mirror assembly includes a primary mirror and a primary mirror tube; the primary mirror is a concave parabolic optical lens with a light-transmitting hole in the center, and the primary mirror tube is a cavity with a truncated cone shape at one end and a cylindrical shape at the other end with an opening, used to accommodate and install the primary mirror; The secondary mirror assembly includes a secondary mirror and a secondary mirror tube; the secondary mirror is a convex optical lens. The secondary mirror assembly positioning device includes: Adjust the screw; A base is threaded to one end of the adjusting screw, and the axial height of the adjusting screw relative to the base is adjustable. The base includes a disc-shaped portion and a cylindrical portion disposed on one side of the disc-shaped portion. The cylindrical portion is provided with a side pin for optionally fixing the adjusting screw to the base. The end face of the disc-shaped portion away from the cylindrical portion is configured as a reference surface. The theoretical axial zero position of the secondary mirror relative to the primary mirror is set by the distance between the reference surface and the end face of the adjusting screw away from the base. Optionally, a locking ring is threadedly connected to the lower locking ring of the cylindrical portion; After the axial theoretical zero position is set, the adjusting screw is fixed to the base by the side top pin, the assembly of the adjusting screw and the base is passed through the main lens assembly, and the base is fixedly connected to the main lens barrel by the lower locking ring; Optionally, a locking ring is threadedly connected to the adjusting screw; The secondary mirror limiting seat is used to radially limit the installation of the secondary mirror assembly, so that it is located at the radial theoretical zero position; the secondary mirror limiting seat is optionally movably connected to the other end of the adjusting screw, and can be driven to move along the axial direction of the adjusting screw through the upper locking ring; When the highest point of the secondary lens and the end face of the adjusting screw away from the base are made to contact and engage by adjusting the upper locking ring, the secondary lens assembly and the primary lens assembly are fixedly connected by the preset connector, thus completing the positioning of the initial installation position.
[0009] In a second aspect, a method for positioning a secondary mirror assembly in a cassette optical system is provided. This method employs a secondary mirror assembly positioning device for a cassette optical system as described in the first aspect, and installs the secondary mirror assembly relative to the primary mirror assembly at an initial installation position where the axial and radial directions are theoretically zero. The method includes: S1: Measure the height from the base reference surface to the end face of the primary mirror; S2: Adjust the height between the base and the end face of the adjusting screw away from the base, so that the height between the base and the end face of the adjusting screw away from the base is equal to the sum of the height from the base reference surface to the end face of the primary mirror and the theoretical distance between the primary and secondary mirrors; S3: Securely connect the adjusting screw and the base; S4: Install the assembly that is fixedly connected to the adjusting screw and the base from bottom to top through the main lens barrel and the main lens and onto the main lens assembly. At this time, the base and the main lens barrel are in contact and fit together, and the base and the main lens barrel are fixedly connected. S5: Install the secondary mirror assembly on the secondary mirror limiting seat, and adjust the axial height of the secondary mirror limiting seat and the secondary mirror assembly installed on it until the highest point of the secondary mirror lens and the end face of the adjusting screw away from the base are in contact. S6: Fix the secondary mirror assembly and remove each component of the secondary mirror assembly positioning device in sequence.
[0010] This application has the following beneficial effects: The card-type primary and secondary mirror axial and radial theoretical zero-position positioning device designed in this application provides a simple and quick method for determining the theoretical zero position of the secondary mirror relative to the primary mirror. It provides accurate calibration of the theoretical design zero position of the secondary mirror (i.e., the theoretical position where the axial distance, radial alignment, and tilt angle are all consistent with the design values). It solves the debugging problem caused by the large difference between the initial installation position and the theoretical position of the secondary mirror relative to the primary mirror before precise optical debugging. It can greatly reduce the debugging workload in the early stage of optical precision debugging and improve debugging efficiency. Attached Figure Description
[0011] Figure 1 A perspective view of a secondary mirror assembly positioning device provided in an embodiment of this application; Figure 2 A cross-sectional view of a secondary mirror assembly positioning device provided in an embodiment of this application; Figure 3 This is a schematic diagram of the zero position of a secondary mirror assembly positioning device provided in an embodiment of this application; Figure 4 A cross-sectional view of a secondary mirror assembly positioning device and an assembly of primary and secondary mirror assemblies provided in an embodiment of this application; Figure 5 This is a schematic diagram for size calculation provided in an embodiment of this application.
[0012] Reference numerals: 1. Primary mirror; 2. Primary mirror tube; 3. Secondary mirror; 4. Secondary mirror tube; 5. Adjusting screw; 6. Base; 7. Side top pin; 8. Lower locking ring; 9. Upper locking ring; 10. Secondary mirror limit seat; 11. Connecting piece. Detailed Implementation
[0013] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, the technical solutions in the embodiments of this application are clearly described. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art are within the scope of protection of this application.
[0014] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.
[0015] The steps described in this application and the flowcharts in the accompanying drawings are not necessarily strictly executed according to the step numbers; the execution order of the steps can be changed. Furthermore, certain steps can be omitted, multiple steps can be combined into one step, and / or one step can be broken down into multiple steps.
[0016] This specification provides a positioning device for a secondary lens assembly of a cassette optical system, and also relates to a positioning method for a secondary lens assembly of a cassette optical system. The following detailed description is provided in conjunction with the accompanying drawings and preferred embodiments.
[0017] Please see Figure 1-5 This application provides a secondary mirror assembly positioning device for a cassette optical system, used to install the secondary mirror assembly relative to the primary mirror assembly to the initial installation position of the theoretical zero position in the axial and radial directions, so as to facilitate optical adjustment; The primary mirror assembly includes a primary mirror 1 and a primary mirror tube 2. The primary mirror 1 is a concave parabolic optical lens with a light-transmitting hole in the center. The primary mirror tube 2 is a cavity with a truncated cone shape at one end and a cylindrical shape at the other end, which is used to accommodate and install the primary mirror 1. The secondary mirror assembly includes a secondary mirror 3 and a secondary mirror tube 4; the secondary mirror 3 is a convex optical lens. The secondary mirror 3 component positioning device includes: Adjusting screw 5; A base 6 is threaded to one end of the adjusting screw 5, and the axial height of the adjusting screw 5 relative to the base 6 is adjustable. The base 6 includes a disc-shaped portion and a cylindrical portion disposed on one side of the disc-shaped portion. The cylindrical portion is provided with a side pin 7 for optionally fixing the adjusting screw 5 to the base 6. The end face of the disc-shaped portion away from the cylindrical portion is configured as a reference surface. The theoretical axial zero position of the secondary mirror 3 relative to the primary mirror 1 is set by the distance between the reference surface and the end face of the adjusting screw 5 away from the base 6. Optionally, a lower locking ring 8 is threadedly connected to the cylindrical portion; After the axial theoretical zero position is set, the adjusting screw 5 and the base 6 are fixed by the side top screw 7, the assembly of the adjusting screw 5 and the base 6 is passed through the main lens 1 assembly, and the base 6 and the main lens barrel 2 are fixedly connected by the lower locking ring 8. Optionally, a locking ring 9 is threadedly connected to the adjusting screw 5; Secondary mirror limiting seat 10 is used to radially limit the installation of the secondary mirror 3 assembly, so that it is located at the radial theoretical zero position; the secondary mirror limiting seat 10 is optionally movably connected to the other end of the adjusting screw 5, and can be driven to move along the axial direction of the adjusting screw 5 by the upper locking ring 9; When the upper locking ring 9 is adjusted so that the highest point of the secondary mirror 3 and the end face of the adjusting screw 5 away from the base 6 are in contact, the secondary mirror 3 assembly and the main mirror 1 assembly are fixedly connected by the preset connector 11, thus completing the positioning of the initial installation position.
[0018] Furthermore, the secondary mirror limiting seat 10 has a limiting groove that fits with the edge clearance of the secondary mirror barrel 4 to achieve radial centering limiting.
[0019] Furthermore, the connector 11 is configured as a plate structure and is fixedly connected to the secondary lens barrel 4 and the main lens barrel 2 by screws.
[0020] Furthermore, the end face of the adjusting screw 5 away from the base 6 is provided with lens paper to prevent scratching the lens.
[0021] See Figure 5 The principle of this application is as follows: First, measure the height dimension (dimension 2) from the reference surface (bottom surface) of base 6 to the end face of primary mirror 1 using a height gauge. Then, adjust the height dimension (dimension 3) between the end face (top surface) of base 6 and adjusting screw 5 away from base 6, so that dimension 3 is equal to the sum of dimension 2 and the theoretical distance between the primary and secondary mirrors 3. After adjusting the dimensions, tighten adjusting screw 5 and base 6 using the side screws. At this point, the assembly of adjusting screw 5 and base 6 has completed the axial zero-position dimension adjustment. Install this assembly from bottom to top through the primary mirror barrel 2 and primary mirror 1 onto the primary mirror 1 assembly. At this point, base 6 and primary mirror barrel 2 are in contact and engaged. Install the lower locking ring 8 to connect and secure base 6 and primary mirror barrel 2. Next, install the locking ring 9 and the secondary mirror limiting seat 10 in sequence, and install the secondary mirror 3 assembly on the secondary mirror limiting seat 10. By rotating the upper locking ring, the secondary mirror limiting seat 10 and the secondary mirror 3 assembly installed on it are moved axially (the secondary mirror barrel 4 can be slightly manually moved to keep it stable in the secondary mirror limiting seat 10). The highest point of the secondary mirror 3 lens and the top surface of the adjusting screw 5 are completely in contact. At this time, the initial theoretical positions (i.e., axial and radial theoretical zero positions) of the distance, eccentricity, and deflection angle of the secondary mirror 3 relative to the primary mirror 1 are all adjusted. Fix the secondary mirror 3 assembly with the connector 11 and screws, and finally disassemble the various parts of the secondary mirror 3 assembly positioning device in sequence.
[0022] This application provides a method for positioning a secondary mirror assembly in a cassette optical system. The method uses the aforementioned secondary mirror assembly positioning device to install the secondary mirror assembly relative to the primary mirror assembly at an initial installation position where the axial and radial directions are theoretically zero. The method includes: Step S1: Measure the height from the reference surface of base 6 to the end face of primary mirror 1; Step S2: Adjust the height between the base 6 and the adjusting screw 5 at the end face away from the base 6, so that the height between the base 6 and the adjusting screw 5 at the end face away from the base 6 is equal to the sum of the height from the base 6 reference surface to the end face of the primary mirror 1 and the theoretical distance between the primary and secondary mirrors 3; Step S3: Securely connect the adjusting screw 5 and the base 6; Step S4: The assembly that is fixedly connected to the adjusting screw 5 and the base 6 is installed from bottom to top through the main lens barrel 2 and the main lens 1 and onto the main lens 1 assembly. At this time, the base 6 is in contact with the main lens barrel 2 and the base 6 and the main lens barrel 2 are fixedly connected. Step S5: Install the secondary mirror 3 assembly on the secondary mirror limiting seat 10. Adjust the axial height of the secondary mirror limiting seat 10 and the secondary mirror 3 assembly installed on it until the highest point of the secondary mirror 3 lens and the end face of the adjusting screw 5 away from the base 6 are in contact. Step S6: Fix the secondary mirror 3 assembly and disassemble each component of the secondary mirror 3 assembly positioning device in sequence.
[0023] Based on the above technical solution, this application has the following outstanding substantive features and significant progress: 1. The assembly and adjustment fixture described in this application can be used to achieve zero-position positioning of the theoretical design of the primary mirror 1 and secondary mirror 3 of the cassette optical system.
[0024] 2. The assembly and adjustment fixture designed in this application has a simple structure, is easy to process, and has a simple and quick assembly and adjustment process.
[0025] 3. By using the assembly and adjustment method described in this application, the axial and radial zero-position positioning accuracy of the primary mirror 1 and the secondary mirror 3 can reach the micrometer level, realizing the theoretical design zero-position positioning of the primary mirror 1 and the secondary mirror 3 of the cassette optical system, which facilitates the subsequent precise adjustment using interferometer instruments.
[0026] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.
[0027] It is understood that the embodiments of this application have been described above in conjunction with the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. As those skilled in the art will know, various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, those skilled in the art, under the guidance or instruction of this application, can modify these features and embodiments to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, this invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this invention.
Claims
1. A positioning device for a secondary lens assembly of a cassette optical system, characterized in that, Used to install the secondary mirror assembly relative to the primary mirror assembly to the initial installation position at the theoretical zero position in the axial and radial directions, so as to facilitate optical adjustment; The primary mirror assembly includes a primary mirror and a primary mirror tube; the primary mirror is a concave parabolic optical lens with a light-transmitting hole in the center, and the primary mirror tube is a cavity with a truncated cone shape at one end and a cylindrical shape at the other end with an opening, used to accommodate and install the primary mirror; The secondary mirror assembly includes a secondary mirror and a secondary mirror tube; the secondary mirror is a convex optical lens. The secondary mirror assembly positioning device includes: Adjust the screw; A base is threaded to one end of the adjusting screw, and the axial height of the adjusting screw relative to the base is adjustable. The base includes a disc-shaped portion and a cylindrical portion disposed on one side of the disc-shaped portion. The cylindrical portion is provided with a side pin for optionally fixing the adjusting screw to the base. The end face of the disc-shaped portion away from the cylindrical portion is configured as a reference surface. The theoretical axial zero position of the secondary mirror relative to the primary mirror is set by the distance between the reference surface and the end face of the adjusting screw away from the base. Optionally, a locking ring is threadedly connected to the lower locking ring of the cylindrical portion; After the axial theoretical zero position is set, the adjusting screw is fixed to the base by the side top pin, the assembly of the adjusting screw and the base is passed through the main lens assembly, and the base is fixedly connected to the main lens barrel by the lower locking ring; Optionally, a locking ring is threadedly connected to the adjusting screw; The secondary mirror limiting seat is used to radially limit the installation of the secondary mirror assembly, so that it is located at the radial theoretical zero position; the secondary mirror limiting seat is optionally movably connected to the other end of the adjusting screw, and can be driven to move along the axial direction of the adjusting screw through the upper locking ring; When the highest point of the secondary lens and the end face of the adjusting screw away from the base are made to contact and engage by adjusting the upper locking ring, the secondary lens assembly and the primary lens assembly are fixedly connected by the preset connector, thus completing the positioning of the initial installation position.
2. The secondary lens assembly positioning device for a cassette optical system according to claim 1, characterized in that, The secondary mirror limiting seat has a limiting groove that fits with the edge of the secondary mirror barrel to achieve radial centering limiting.
3. The secondary lens assembly positioning device for a cassette optical system according to claim 1, characterized in that, The connector is configured as a plate structure and is fixedly connected to the secondary lens barrel and the primary lens barrel by screws.
4. The secondary lens assembly positioning device for a cassette optical system according to claim 1, characterized in that, The end face of the adjusting screw away from the base is provided with lens paper to prevent scratching the lens.
5. A method for positioning a secondary mirror assembly in a cassette optical system, characterized in that, Using the secondary mirror assembly positioning device of the cassette optical system as described in any one of claims 1-4, the secondary mirror assembly is installed relative to the primary mirror assembly at the initial installation position of theoretical zero position in the axial and radial directions, comprising: S1: Measure the height from the base reference surface to the end face of the primary mirror; S2: Adjust the height between the base and the end face of the adjusting screw away from the base, so that the height between the base and the end face of the adjusting screw away from the base is equal to the sum of the height from the base reference surface to the end face of the primary mirror and the theoretical distance between the primary and secondary mirrors; S3: Securely connect the adjusting screw and the base; S4: Install the assembly that is fixedly connected to the adjusting screw and the base from bottom to top through the main lens barrel and the main lens and onto the main lens assembly. At this time, the base and the main lens barrel are in contact and fit together, and the base and the main lens barrel are fixedly connected. S5: Install the secondary mirror assembly on the secondary mirror limiting seat, and adjust the axial height of the secondary mirror limiting seat and the secondary mirror assembly installed on it until the highest point of the secondary mirror lens and the end face of the adjusting screw away from the base are in contact. S6: Fix the secondary mirror assembly and remove each component of the secondary mirror assembly positioning device in sequence.