Wide-spectrum apochromatic optical imaging lens

Abstract

The invention relates to the technical field of lenses. The invention discloses a wide-spectrum apochromatic optical imaging lens. Nine lenses are sequentially arranged along an optical axis from an object side to an image side: the first lens is a convex-concave lens with a negative refractive index; the second lens and the fourth lens are convex lenses with positive refraction; the third lens isa concave lens with negative refractive index; the fifth lens element with negative refractive index has a concave image-side surface; the sixth lens is a concave-convex lens with a positive refractive index; the seventh lens is a concave-convex lens with a negative refractive index; the eighth lens is a concave-convex or plano-convex lens with a positive refractive index; and the ninth lens is aconcave-convex lens with a negative refractive index, wherein the first lens to the fifth lens form a negative lens group of a reverse telephoto objective lens, and the sixth lens to the ninth lens form a positive lens group of the reverse telephoto objective lens. The lens has the advantages of wide spectrum design, good confocal property, good chromatic aberration correction, high imaging quality, more acquired spectrum channels, small size, light weight and good relative illuminance uniformity in a view field range.

Description

technical field [0001] The invention belongs to the field of lens technology, and in particular relates to a wide-spectrum apochromatic optical imaging lens for multi-spectral imaging technology. Background technique [0002] Thanks to the development and perfection of UAV technology, the application of UAV-borne multispectral technology in the civilian field has shown a substantial and comprehensive development, and it is widely used in many fields such as resource inspection, geological exploration, disaster investigation, and surveying and mapping. In agricultural applications, drone-borne multispectral technology can assist in the monitoring of information such as pest monitoring, soil fertility, and crop growth. Through remote sensing and multispectral imaging technology, it provides farmers with the ability to monitor crop health. [0003] Existing multispectral cameras used in the field of multispectral technology mainly include the following three types: [0004] Mu...

AI Technical Summary

Problems solved by technology

However, after many times of light splitting and reflection, more energy is lost. At the same time, it is required to have good imaging quality in a wide spectrum, and the lens design is more difficult.

[0007] Three kinds of spectral cameras, each with its own advantages and disadvantages: the beam splitting type sacrifices imaging quality to obtain higher overlapping accuracy; while the multi-lens and multi-camera type has higher imaging quality, but poor overlapping

[0008] As the application of multi-spectral technology becomes more and more common, its requirements for optical imaging lenses are also getting higher and higher. However, the optical imaging lenses for multi-spectral technology currently on the market still have many shortcomings, such as the simultaneous acquisition of spectral channels is relatively limited. , which limits the application; the lens size is large, and the application load of the drone is large; the confocal and chromatic aberration corrections are general, and it is difficult to use filters such as double peaks and triple peaks, etc. Therefore, it is necessary to improve them to meet Consumers' increasing demands

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