Chinese Optics, Volume. 17, Issue 4, 921(2024)
Design of large zoom ratio compact microscope based on coaxial Kohler illumination
Figures & Tables(19)
Fig. 1. Imaging principle diagram of the positive group compensation zoom optical system
Fig. 4. 2D structural diagram of the 10× continuous zoom microscope
Fig. 10. Structural parameters of the Kohler illumination optical system
Table 1. Design parameters of zoom microscope optical system
View tableView in ArticleTable 1. Design parameters of zoom microscope optical system
参数 数值 变倍比 10× 放大率 −0.6~−6.0 工作距/mm 60 工作波段/nm 480~660 相机分辨率/pixel 2448×2048 像素尺寸/µm 3.45×3.45 照明方式 同轴柯勒照明
Table 2. Focal lengths of the four groups in the initial structure
View tableView in ArticleTable 2. Focal lengths of the four groups in the initial structure
组元 前固定组 变焦组 补偿组 后固定组 焦距/mm 40.7 −29.3 54.4 1001.9
Table 3. Spacing between the four groups
View tableView in ArticleTable 3. Spacing between the four groups
放大倍率β 组元距离 −l1/mm d12/mm d23/mm d34/mm l4ʹ/mm −0.6 60.0 36.02 98.06 36.75 49.17 −1.5 60.0 51.88 53.13 65.82 49.17 −6.0 60.0 82.53 3.20 85.10 49.17
Table 4. Object-side resolution of the zoom microscope
View tableView in ArticleTable 4. Object-side resolution of the zoom microscope
放大倍率 物方NA 物方分辨率 β=−0.6 0.038 9.0 µm β=−1.5 0.073 4.6 µm β=−6.0 0.192 1.75 µm
Table 5. Tolerance distribution of the zoom microscope
View tableView in ArticleTable 5. Tolerance distribution of the zoom microscope
公差项 数值 光圈/fringe ≤3 元件厚度/mm ±0.02 表面偏心/mm ±0.01 元件倾斜/(°) ±0.01 元件偏心/mm ±0.01 表面不规则度/fringe ≤0.3 折射率 ±0.001 阿贝数/% ±0.5
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Qi WANG, Guo-fang ZHANG. Design of large zoom ratio compact microscope based on coaxial Kohler illumination[J]. Chinese Optics, 2024, 17(4): 921
Paper Information
Received: Dec. 30, 2023
Accepted: Apr. 15, 2024
Published Online: Aug. 9, 2024
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