在一些环境比较恶劣的情况下,需要密封使用的变倍望远镜,经常会将转像及变焦集成到目镜上,这样更有利于整体进行密封设计。因此设计了一种在可见光波段具有实像面转像变焦目镜的方案。通过对目镜初始结构的分析,高斯光学的计算,运用Zemax软件对选定结构进行优化设计,得到三组元4倍变焦目镜。目镜在变焦时入瞳的位置保持不变,出瞳位置的变化在3 mm之内。传递函数曲线、畸变和倍率色差均符合目视光学系统的设计要求。根据动态光学理论,用Matlab软件设计了凸轮曲线,使得变焦的过程中像面比较稳定,调焦平滑。虽然目镜结构略显复杂,但光学镜片均采用球面,降低了整体目镜的成本,而且便于加工装配。

In some cases of harsh environment, we need to seal zoom telescope in use, and the functions of reversed image and zoom are often integrated into the eyepiece. Which is more conducive to the overall seal design. Therefore, a scheme of the zoom eyepiece of the reversed real image plane in the visible light band is designed. Through the analysis of the initial structure of the eyepiece and the calculation of Gaussian optics, the selected structure is optimized by Zemax software to obtain the zoom eyepiece with three-group and 4×zoom. The position of the entrance pupil keeps constant when the eyepiece is zooming and the exit pupil position changes within 3 mm. The transfer function curve, distortion and chromatic difference of magnification are consistent with the design requirements of the visual optical system. According to the dynamic optical theory, the cam curve is designed with Matlab software, which makes the image plane relatively stable and the focusing smooth in the process of zooming. Although the eyepiece structure is slightly complex, but the optical lenses are spherical, which reduces the overall cost of the eyepiece and makes it easy to process the assembly.