Design of fish eye lens with large target surface and heat dissipation difference
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摘要: 为了满足信息化时代对高清鱼眼镜头的应用需求，利用CODE V和Zemax光学软件设计了一款匹配16 mm（1英寸）CCD的大孔径玻塑混合鱼眼镜头。该系统可在光谱为486 nm～656 nm以及850 nm范围内清晰成像，视场角为210°，F数2.0，焦距为4.1 mm，F-Theta畸变小于7%，边缘照度大于68%。常温下，该系统在奈奎斯特频率91 lp/mm处0.707视场MTF大于0.5，全视场MTF大于0.35。−40 ℃～+75 ℃状态下0.707视场MTF大于0.3，全视场MTF大于0.2，满足高低温环境下的使用要求。系统采用7片式玻塑混合的结构形式，具备大视场角、大靶面、大光圈等特征，可广泛应用于高清摄像、安防监控、工业生产等领域。Abstract: In order to meet the application requirements of high-definition fish eye lens in the information age, a large-aperture glass plastic hybrid fish eye lens optical system matching a 16 mm (1") CCD was designed by using CODE V and ZEMAX optical software. The system provides clear imaging in the spectrum range of 486 nm~656 nm and 850 nm. The field angle is 210°, the F number is 2.0, the focal length is 4.1 mm, the F-Theta distortion is less than 7%, and the edge illumination is more than 68%. At normal temperature, the MTF of 0.707 field of view is greater than 0.5 and the MTF of full field of view is greater than 0.35 at the Nyquist frequency of 91 lp/mm. At −40 ℃~75 ℃, the MTF of 0.707 field of view is greater than 0.3, and the MTF of full field of view is greater than 0.2, which can meet the requirements of high and low temperature environment. The design adopts a 7-piece glass plastic hybrid structure, which has the characteristics of large field of view angle, large target surface and large aperture. It can be widely used in high-definition camera, security monitoring, industrial production and other fields.
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Key words:
- optical design /
- fish eye lens /
- large target surface /
- heat dissipation difference
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表 1 大靶面消热差鱼眼镜头设计指标
Table 1 Design indexes of fish eye lens with large target surface and heat dissipation difference
参数 指标 工作波段/nm 486～656，850 F数 2.0 视场角/（°） 210 像元尺寸/µm 5.5×5.5 分辨率/pixels 2 048×2 048 相对照度/% ≥45 工作温度/℃ −40～+75 
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表 2 光学系统玻璃和塑料材料参数
Table 2 Optical system glass and plastic material parameters
镜片 材料 Nd Vd 1 H-ZLAF69 1.816 46.54 2 H-LAK53A 1.755 52.33 3 K26R 1.535 55.71 4 H-ZLAF52A 1.806 41.01 5 K26R 1.535 55.71 6 EP8000 1.661 20.38 7 K26R 1.535 55.71
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