Objective lens design of image guide fiber bundle with large field and low distortion
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摘要: 在大截面传像束前置光学系统设计中，采用负-正型式的像方远心光路结构，在像差校正过程中引入偶次非球面和弯月形厚透镜，可较好地解决镜头轴外像差校正与像面照度均匀性问题，同时使镜头结构紧凑、小型化。通过理论计算和优化，给出工作在660 nm，焦距f=1.22 mm，相对孔径D/f=1∶3，视场角2为60的镜头设计实例。设计结果表明：该镜头各视场在40lp/mm空间频率处的MTF值超过0.8，全视场畸变小于0.05%，场曲低于50m，像面照度均匀，像质优良，满足像方远心光路要求，可用于实际观察和测量。Abstract: In the design of front lens for the large cross-section image guide fiber bundle, the negative-positive structure with telecentric structure in image space, even aspheric surface and crescent thick lens were applied for solving the problems on off-axial aberrations and illumination uniformity on the image plane, as well as keeping the lens compact and small. After theoretical calculation and optimization, the design was developed whose operating wavelength, focal length, angle of view and relative aperture were 660 nm, 1.22 mm, 60 and 1∶3, respectively. The results showed that the MTF value of the lens was higher than 0.8 at the spatial frequency of 40 lp/mm, the relative distortion of the lens in the largest field was less than 0.05% and the field curvature was lower than 50 m. With the fine quality of imaging, the lens could be used for observation and measurement.
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Keywords:
- applied optics /
- front lens /
- aspheric surface /
- telecentric structure
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