A small-size uncooled dual-field infrared optical system

Abstract

The invention provides a small size uncooled dual-field-of-view infrared optical system which comprises a first positive meniscus lens and a detector. A biconcave lens, a second positive meniscus lens, a negative meniscus lens and a third positive meniscus lens are sequentially arranged from the first positive meniscus lens to the detector along the optical axis; the first positive meniscus lens, the second positive meniscus lens and the third positive meniscus lens each have positive diopter, and the biconcave lens and the negative meniscus lens each have negative diopter. Both the curved surface S3 of the biconcave lens and the curved surface S7 of the negative meniscus lens are aspheric surfaces, and the aspheric surface S7 is further provided with a binary diffraction surface. The lenses of different types are reasonably arranged and the positive diopter and the negative diopter of the lenses are selected, so that the whole dual-field-of-view infrared optical system has a smaller size and a larger zooming ratio, has a larger zooming range under the switching conditions of a narrow field of view and a wide field of view, and is suitable for occasions with small size requirements for infrared optical systems.

Description

technical field [0001] The present invention relates to a small-sized uncooled dual-field infrared optical system, more specifically, to a small-sized non-cooled infrared optical system that distributes positive meniscus lenses, biconcave lenses and negative meniscus lenses rationally and selects their positive and negative diopters. Cooled dual-field infrared optical system. Background technique [0002] The infrared thermal imaging system uses the principle that all objects with a temperature higher than absolute zero (-273°C) in nature radiate infrared rays at all times, and at the same time this infrared radiation carries the characteristic information of the object, and then through the photoelectric Conversion, electrical signal processing and other means to convert the temperature distribution image of the target object into a high-tech product of video image. [0003] Because it does not require refrigeration and is cheap, the uncooled infrared system is currently w...

AI Technical Summary

Problems solved by technology

In recent years, there have been some designs of uncooled dual-field infrared systems, such as the invention patent document CN201010516394.8 announced on May 18, 2011, which discloses an uncooled dual-field infrared system whose focal length Switch between 56.7㎜ and 114.3㎜ focal lengths, and the length reaches 232㎜. Such a large volume is inconvenient or unusable for some occasions.

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