Dual-field-of-view lens

Abstract

The invention discloses a dual-field-of-view lens, which comprises an optical path steering assembly, a first lens group, a second lens group and a field-of-view switching assembly, wherein the firstlens group and the second lens group are not equal in equivalent focal length; the optical path steering assembly is used for receiving incident light of a first field of view and reflecting the incident light of the first field of view to the first lens group; and the field-of-view switching assembly is used for being inserted into an optical path during switching of the first field of view and asecond field of view and reflecting the received converging light of the switched field of view. The dual-field-of-view lens adopts two lens groups with unequal equivalent focal length to perform imaging on two different fields of view, there is no shared lens, the focal length of each lens group can be independently designed, and the image quality does not need to compromise; and a reflecting action of the inserted field-of-view switching assembly is utilized during switching of the field of view, so that only the parallelism of an optical axis needs to be considered, the coaxiality is not required to be considered, and thus the adjustment difficulty of the lens is reduced.

Description

technical field [0001] The invention relates to the field of imaging technology, in particular to a dual-view lens. Background technique [0002] With the continuous optimization and upgrading of the field of video surveillance, the unique advantages of thermal imaging technology in the fields of night vision, fire protection, and temperature monitoring are increasingly recognized. Meet more and more diverse usage needs. Among them, the dual field of view lens can meet the needs of large scene search and quickly (within 1 second) zoom in on suspicious targets, and has been widely acclaimed in the fields of border defense and forest fire prevention. [0003] Such as figure 1 As shown, it is a schematic diagram of the structure of the currently used dual-field of view lens. When switching from a wide-angle field of view (short focus) to a long-focus field of view, a switching lens group is added, so that the switching lens group can be added The power of the entire optical ...

AI Technical Summary

Problems solved by technology

However, at the beginning of the design of the dual field of view lens with the above structure, it is necessary to comprehensively consider the focal power allocation of each lens group under the two focal lengths, which will complicate the solution and increase the manufacturing cost; and, considering that the two lenses are compatible The image quality of one of the lenses at a certain focal length will inevitably be compromised, and the image quality is not good

In addition, when changing the field of view, the position of the lens is strictly required, and multiple parameters such as parallelism, lens group spacing, and lens group coaxiality need to be taken into account at the same time. Therefore, lens adjustment is difficult.

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