Zoom infrared optical system, zooming device and manufacturing method thereof

Abstract

The invention relates to a zoom infrared optical system, a zooming device and a manufacturing method thereof, in particular to a multi-gear zoom infrared optical system, a linearly cut-in zooming device and a manufacturing method thereof. The zooming device comprises a long-focus lens group and a zooming lens group, wherein lens materials are both optical materials which can work on an infrared wave band; the long-focus lens group consists of a front fixed lens group and a rear fixed lens group; the zooming lens group is positioned between the front fixed lens group and the rear fixed lens group; during long-focus imaging, the zooming lens group is positioned outside a light path between the front fixed lens group and the rear fixed lens group; and during zooming imaging, the zooming lens group moves parallelly and linearly cuts in the light path between the front fixed lens group and the rear fixed lens group through a control mechanism, and the central optical axis of the zooming lens group coincides with that between the front fixed lens group and the rear fixed lens group. The zoom infrared optical system, the zooming device and the manufacturing method thereof have the advantages that: due to the adoption of the linearly cut-in zooming mode, the multi-gear zooming infrared optical system overcomes the defect of the traditional zooming mode, can effectively enhance the operating distance and the resolving capability of the system and realize multi-gear focus and field-of-view.

Description

technical field [0001] The invention relates to a zooming infrared optical system, a zooming device and a manufacturing method, in particular to a multi-level zooming infrared optical system, a straight-line cut-in zooming device and a manufacturing method. Background technique [0002] The zoom optical system uses the movement of one or more lens groups in the optical system to change the combined focal length of the system while keeping the final image plane unchanged. Since the zoom optical system can quickly change the focal length of the system within a certain range and obtain different proportions of images and fields of view, it has been widely used in the field of optical applications. The variable focal length infrared optical system uses infrared optical materials working in the infrared band as lens components to focus the infrared energy radiation from the outside and converge it into an image on the target surface of the infrared detector. The optical system i...

AI Technical Summary

Problems solved by technology

Since the zoom lens group is always in the optical path and participates in imaging, in order to take into account the imaging quality of each field of view at the same time, the system requires a large number of lenses for aberration balance and overall optimization, resulting in a large number of lenses at the telephoto end of the system. The rate is not high, which restricts the improvement of the system's working distance

[0005] (2) Image quality is affected by zoom factors

Since the zoom lens group participates in imaging in each field of view, the processing error and assembly positioning error of the zoom lens group directly have a negative impact on the imaging quality of each field of view, which restricts the improvement of the system's resolution.

[0006] (3) The field of view and the number of motion components are limited

However, due to the limitation of the movement mode, in order to avoid cutting the telephoto light by the zoom lens group, it is necessary to leave enough space between the positive and negative lenses of the zoom lens group to ensure The telephoto optical path is not affected, and the axial length of the zoom lens group is relatively long, which also limits the freedom of optical design; at the same time, because the axial length of the zoom lens group is too long, the space of the system using this zoom method is limited. In the case of the general working field of view, only two

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