A U-shaped folding infrared optical system mirror adjusting device
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- KUNMING NORTH INFRARED TECH CO LTD
- Filing Date
- 2025-10-29
- Publication Date
- 2026-08-07
AI Technical Summary
这些现有方案虽然能够实现装调功能，但它们普遍存在一个共性缺陷：需要借助多台高精度测量设备（如自准直仪、经纬仪）及光学元件（如五棱镜）协同建立多个临时基准，导致装调系统构成复杂、操作步骤繁琐，且多个基准之间的对准误差会不可避免地累积到最终装调结果中，不仅对操作人员技能要求高，也制约了装调效率与精度的进一步提升
与现有技术相比，本实用新型采用了“基准传递”的设计原理，通过以热像仪壳体第一透镜安装面为唯一基准，利用可调姿的调节板将这一基准高精度地传递至反射镜组上方，实现了装调过程的优化。首先，基于单一基准的装调方法从源头上避免了多基准引入的误差累积，确保了最终的装调精度；其次，通过调节板上基准的平移，能够直接测量出两块反射镜共同引入的综合光路偏差，实现了反射镜组的整体装调，省去了对单块反射镜反复调试的繁琐步骤，显著提升了装调效率；最后，由调节栓和带弹簧的支撑钉构成的调平机构，为基准的精确传递提供了可靠的机械保障，确保了调节板姿态调整的精细度与稳定性。这种将基准传递、整体装调和精密调姿融为一体的方案，有效解决了传统装调方法中的关键技术难题。
Smart Images
Figure CN224609322U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of optical instrument assembly and adjustment technology, specifically relating to an assembly and adjustment device for a U-shaped folding infrared optical system reflector. Background Technology
[0002] In optical systems such as infrared thermal imagers, a U-shaped optical path folding layout is commonly used to reduce overall size and achieve miniaturization and integration. This layout utilizes two plane mirrors to reflect the light path twice, achieving a 180° fold, thus changing the system's external shape from a slender elongated shape to a more compact, short and stout one. However, ensuring that the light path can still be transmitted accurately and coaxially after two reflections places extremely high demands on the spatial angle and relative position of the two mirrors (i.e., the mirror assembly). Therefore, the precise assembly and adjustment of the mirror assembly has always been a core challenge and key step in the manufacturing process of this type of product.
[0003] Currently, various solutions have been proposed both domestically and internationally for the assembly and adjustment of such folding optical path systems. While these existing solutions can achieve the assembly and adjustment function, they generally share a common drawback: they require the collaborative establishment of multiple temporary references using multiple high-precision measuring devices (such as autocollimators and theodolites) and optical components (such as pentaprisms). This results in a complex assembly and adjustment system, cumbersome operation steps, and the inevitable accumulation of alignment errors between multiple references in the final assembly and adjustment result. This not only demands high skill levels from operators but also restricts further improvements in assembly and adjustment efficiency and accuracy. Utility Model Content
[0004] To solve the above-mentioned technical problems, this utility model provides a U-shaped folding infrared optical system reflector assembly and adjustment device, which has a simple structure, is easy to operate, and achieves overall assembly and adjustment with a single reference, thus avoiding error accumulation.
[0005] The U-shaped folding infrared optical system reflector mounting and adjusting device of this utility model includes a bracket, which is fixed to the centering instrument worktable by a mounting base at the bottom. The top of the bracket is connected to a flange outer spherical bearing seat via a fixed shaft, the center of the bearing seat is connected to a support shaft, and the bottom of the support shaft is connected to the center of gravity of the adjustment plate via a connecting shaft. The bracket is also threaded with two adjusting bolts, the ends of which contact the upper surface of the adjusting plate. The bracket is also provided with a support pin. One end of the support pin is connected to the sleeve through a spring. The sleeve is fixed to the top of the bracket. The other end of the support pin contacts the upper surface of the adjustment plate and provides elastic preload to the adjustment plate. The bracket also has connection holes on its front side.
[0006] The adjustment plate has mounting holes.
[0007] The two adjusting bolts are symmetrically arranged on opposite sides of the support shaft, and the support pin is located on the symmetrical center line of the two adjusting bolts, forming a stable three-point support structure.
[0008] During the assembly and adjustment process, the mounting surface of the first lens of the infrared optical system is used as the sole angular reference.
[0009] The beneficial effects of this utility model are: Compared with existing technologies, this invention adopts the design principle of "reference transfer." By using the mounting surface of the first lens on the thermal imager housing as the sole reference, an adjustable adjustment plate is used to transfer this reference with high precision to the top of the mirror assembly, thus optimizing the assembly and adjustment process. First, the assembly and adjustment method based on a single reference avoids the accumulation of errors introduced by multiple references from the outset, ensuring the final assembly and adjustment accuracy. Second, by shifting the reference on the adjustment plate, the combined optical path deviation introduced by the two mirrors can be directly measured, achieving overall assembly and adjustment of the mirror assembly, eliminating the tedious steps of repeatedly adjusting individual mirrors, and significantly improving assembly and adjustment efficiency. Finally, the leveling mechanism, consisting of an adjustment bolt and a spring-loaded support pin, provides reliable mechanical protection for the precise transfer of the reference, ensuring the precision and stability of the adjustment plate's attitude adjustment. This integrated solution, which combines reference transfer, overall assembly and adjustment, and precise attitude adjustment, effectively solves the key technical problems in traditional assembly and adjustment methods. Attached Figure Description
[0010] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments are briefly introduced below.
[0011] Figure 1 This is a schematic diagram of the overall structure of the assembly and adjustment device in the embodiment.
[0012] Figure 2 This is a schematic diagram of the support shaft composition of the assembly and adjustment device in the embodiment.
[0013] Figure 3 This is a cross-sectional view of the support shaft of the assembly and adjustment device in the embodiment.
[0014] Figure 4 This is a schematic diagram of the assembly and adjustment device connected to the thermal imager housing in the embodiment.
[0015] Figure 5 This is a schematic diagram illustrating the establishment of the reference for the mounting surface of the first lens of the thermal imager in this embodiment.
[0016] Figure 6 This is a schematic diagram of the reference transfer and leveling of the adjustment plate in the embodiment.
[0017] Figure 7 This is a schematic diagram of the comprehensive error measurement and correction of the reflector group in the embodiment.
[0018] In the attached diagram, the structural names represented by each number are as follows: 1-Bracket, 101-Mounting base, 2-Adjusting plate, 201-Mounting hole, 3-Adjusting bolt, 4-Support shaft, 401-Connecting shaft, 5-Flange outer spherical bearing seat, 6-Fixed shaft, 7-Support pin, 701-Sleeve, 702-Spring, 8-Thermal imager housing, 9-First lens mounting surface, 10-Centerer worktable, 11-Centerer measuring head, 12-First reflecting mirror, 13-Second reflecting mirror, 14-Parallel flat crystal A, 15-Parallel flat crystal B. Detailed Implementation
[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0020] Example 1 See Figures 1 to 4 As shown, a U-shaped folding infrared optical system reflector mounting and adjusting device is provided. The device mainly consists of a bracket 1, a support shaft 4 assembly, an adjusting plate 2, and a leveling mechanism.
[0021] The bracket 1 serves as the supporting base for the entire device, and its bottom is equipped with a mounting base 101 for fixing the entire device to the centering instrument stage 10. The front of the bracket 1 has a connection hole and is connected to the thermal imager housing 8 by bolts.
[0022] The support shaft assembly includes a fixed shaft 6, a flange outer spherical bearing housing 5, a support shaft 4, and a connecting shaft 401. The fixed shaft 6 is connected to the top of the bracket 1, extends downwards, and connects to the flange outer spherical bearing housing 5. The center of the bearing housing is connected to the support shaft 4, and the bottom of the support shaft 4 is connected to the center of gravity of the adjusting plate 2 via the connecting shaft 401. This ensures that the adjusting plate 2 can achieve multi-degree-of-freedom micro-rotation with the support shaft 4 as the center.
[0023] The adjusting plate 2 is connected to the support shaft 4 via a connecting shaft 401, and has mounting holes 201 for mounting a parallel optical plane. The position of the adjusting plate 2 covers the reflector area of the thermal imager housing 8, which facilitates reference transfer and error measurement.
[0024] The leveling mechanism includes two adjusting bolts 3 and one support pin 7. The two adjusting bolts 3 are symmetrically threaded onto the bracket 1, located on opposite sides of the support shaft 4, with ball-head ends that contact the upper surface of the adjusting plate 2. The support pin 7 is positioned on the extended line of the center of symmetry of the two adjusting bolts 3 and is connected to the inside of a sleeve 701 fixed to the adjusting plate 2 via a spring 702. This provides a continuous elastic preload to the adjusting plate 2, forming a three-point leveling mechanism that ensures the adjusting plate 2 maintains stable contact with the ends of the adjusting bolts 3, eliminating movement gaps. By coordinating the screw-in depth of the two adjusting bolts 3, the deflection angle of the adjusting plate 2 around the axis of the support shaft 4 can be precisely controlled.
[0025] The assembly and adjustment process is as follows: First, establish assembly and adjustment standards. (See...) Figure 5 As shown, bracket 1 is mounted on centering stage 10 via mounting base 101. Then, thermal imager housing 8, containing the mirror assembly (first mirror 12, second mirror 13), is mounted on the front of bracket 1 using bolts. A parallel flat crystal A14 is placed on the first lens mounting surface 9. The centering instrument is turned on, and the tilt of the centering stage 10 is adjusted so that the angular error of the parallel flat crystal A14 measured by the centering instrument measuring head 11 is zero, thus establishing the first lens mounting surface 9 as the sole reference.
[0026] Next, the reference transfer is performed. (See also...) Figure 6 As shown, remove the parallel flat crystal A14 and place the reflective parallel flat crystal B15 in the mounting hole 201 of the adjusting plate 2. Observe the angle error displayed by the centering instrument, and alternately adjust the two adjusting bolts 3. By changing the tilt posture of the adjusting plate 2, the angle error of the parallel flat crystal B15 is adjusted to zero, thus completing the accurate transfer of the reference from the first lens mounting surface 9 to the adjusting plate 2.
[0027] Finally, perform comprehensive error correction. (See also...) Figure 7 As shown, the parallel flat crystal B15 is moved to directly above the second reflector 13, and the combined optical path deviation introduced by the first reflector 12 and the second reflector 13 is measured. Based on the error characteristics, metal shims are inserted at the corresponding reflector mounting positions, and the combined error is corrected by changing the reflector tilt angle until the optical design requirements are met.
[0028] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not describe all details exhaustively, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification.
Claims
1. A U-shaped folding infrared optical system reflector mounting and adjusting device, characterized in that, Includes a bracket (1), the bottom of which is provided with a mounting base (101) for fixing the device to the centering instrument worktable (10). The top of the bracket (1) is connected downward to a flange outer spherical bearing seat (5) via a fixed shaft (6), the center of the bearing seat is connected to a support shaft (4), and the bottom of the support shaft (4) is connected to the center of gravity of the adjusting plate (2) via a connecting shaft (401). The bracket (1) is also threaded with two adjusting bolts (3), the ends of which are in contact with the upper surface of the adjusting plate (2); The bracket (1) is also provided with a support nail (7). One end of the support nail (7) is connected to the sleeve (701) through a spring (702). The sleeve (701) is fixed to the top of the bracket (1). The other end of the support nail (7) contacts the upper surface of the adjusting plate (2) and provides elastic preload to the adjusting plate (2). The bracket (1) also has a connection hole on its front side.
2. The U-shaped folding infrared optical system reflector mounting and adjusting device according to claim 1, characterized in that: The adjustment plate (2) has a mounting hole (201).
3. The U-shaped folding infrared optical system reflector mounting and adjusting device according to claim 1, characterized in that: The two adjusting bolts (3) are symmetrically arranged on opposite sides of the support shaft (4), and the support nail (7) is located on the symmetrical center line of the two adjusting bolts (3). The three together form a stable three-point support structure.