Wide depth-of-field telescopic optical system based on positive lens focusing

Abstract

The invention provides a wide-depth-of-field telescopic optical system based on positive lens focusing. The wide-depth-of-field telescopic optical system comprises a front fixing group, a rear fixing group, a positive lens, a single positive lens and an eyepiece which are sequentially arranged along an optical path, the fixed group adopts a combined lens group form, and on the basis of an original single glued lens group, two groups of glued lenses are additionally arranged for aberration correction and light beam integration, so that the requirements of a high-performance theodolite and similar observation equipment can be met; meanwhile, the single positive lens is adopted as the focusing lens group, so that the focusing structure is greatly simplified, the adjustment cost is reduced, the installation and adjustment time is shortened, and the convenience of the single positive lens moving back and forth along the optical axis of the positive lens during focusing is also improved; the invention can be applied to telescopic systems such as aiming orientation, astronomical observation and the like, can be widely applied to the field needing ultra-short-distance telescopic observation, and can realize wide depth-of-field adjustment of infinite-distance collimation imaging and close-range photography imaging.

Description

technical field [0001] The invention belongs to the technical field of optical systems, in particular to a telescopic optical system with wide depth of field and focusing based on a positive mirror. Background technique [0002] Focusing telescopic system is a typical optical system to achieve scene observation within a certain range, generally composed of objective lens group and eyepiece group. The objective lens group is used to image the scene on the focal plane of the eyepiece, and then project it to the human eye through the eyepiece to observe the scene. The objective lens group of the focusing telescope is composed of a fixed combination focusing group. The fixed group keeps its position unchanged during the observation process, while the focusing group needs to move back and forth according to the distance of the observed scene, so as to realize the focusing and imaging of the scene at different distances. The distance at which the optical system can clearly observ...

AI Technical Summary

Problems solved by technology

However, there is no publicly available wide depth of field telephoto optical system design that can achieve this focusing range.

[0003] The usual internal focusing telescope is one of the most classic telescopic systems. Its fixed group uses a positive lens group, while the focusing group uses a negative lens group. The advantage of this design is that it can shorten the total length of the system, but its focusing The range is small, and the δ=f:l=1:20 that can generally be realized cannot meet the observation requirements such as high-precision electronic theodolite

[0004] And some public design types, such as in 2012, Liu Kai and others disclosed the design of a set of positive focusing lens group, which further improved the focusing range of the telephoto system. 3m, the δ has only reached 1:12; at the same time, because its fixed group uses a single cemented lens group, the potential for optical performance optimization is also limited, so its focusing range still cannot meet the observation requirements of a high-performance electronic theodolite

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