Design of inner focusing object lens in HUD parallax surveymeter based on multi configuration
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摘要: 根据平显视差测量原理中自动调焦的要求，设计了一个相对孔径与调焦范围均较大的内调焦物镜。针对内调焦传统设计方法的不足，在对内调焦各镜组选型后将它们组合成为一个系统，采用多重数据结构设计的方法，对不同物距下的结构进行同时优化，从而解决了近距离的成像质量难以控制的问题。所设计的内调焦物镜在不同的物距下成像质量稳定，无穷远时光学传递函数(MTF)值在空间频率为120lp/mm时轴上与轴外均达到0.4以上，物距在300mm时轴上视场MTF为0.3，轴外视场弧矢MTF在0.3以上，子午MTF达到了0.2；相对畸变均控制在1%以内，有利于后续的图像处理工作。Abstract: According to the requirement of automatic focusing in HUD parallax measuring principles, an inner focusing objective of larger relative aperture and focusing range was designed. In order to eliminate the defects in traditional design, the selected lens groups are assembled into a system and multiconfiguration method is adopted to optimize the length of different object distance. In this way, the problem of uncontrollability of short-distance imaging quality was solved. The newly designed inner focusing lens performed well and stable under different object distance, MTF values are above 0.4 both on the optical axis and off-axis in infinite distance when the spatial frequency is 120lp/mm, 0.3 on the optical axis at 300mm; the off-axial sagittal of arc is 0.3 and meridian is 0.2, and the relative distortion is confined within 1%. All achieved makes the after-treatment of the image more convenient.
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Keywords:
- optical design /
- inner focusing object lens /
- multi-configuration /
- parallax
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