Large-view field wide-spectrum afocal optical system

Abstract

The invention discloses a large-view field wide-spectrum afocal optical system. Incident light and emergent light are parallel light beams, and the system sequentially comprises, from an object side to an image side, a first lens group with a negative focal length, a second lens group with a negative focal length, and a third lens group with a positive focal length. Specifically, the lens of the first lens group is made of glass with a refractive index nd of greater than 1.6 and chromatic dispersion vd of smaller than 50, an incident surface of the first lens group closest to the object side is a convex surface, an emergent surface closest to the image side is a concave surface; the lens of the second lens group is made of glass with a refractive index nd of smaller than 1.6 and chromaticdispersion vd of greater than 50, and an incident surface of the second lens group closest to the object side is a convex surface, an emergent surface closest to the image side is a concave surface; the lens of the third lens group is made of glass with a refractive index nd of smaller than 1.6 and dispersion vd of greater than 50, an incident surface of the third lens group closest to the objectside is a convex surface, and an emergent surface of the third lens group closest to the image side is a convex surface. According to the invention, an ideal imaging quality is achieved in a relatively wide wave band and large view field range.

Description

Technical field

[0001] The invention relates to the field of optical lenses and optical design, in particular to a large-field wide-spectrum afocal optical system. Background technique

[0002] The imaging spectrometer can not only obtain the spatial dimension information of the observed target, but also provide its distinguished spectral dimension information, and then obtain key information such as its chemical composition by analyzing the spectral characteristics of the measured target. However, the imaging spectrometer products on the market cannot meet the needs of every user, especially for the individual users who have higher requirements for the field of view, most of the products currently on the market cannot meet their requirements. Therefore, by developing and supporting an afocal optical lens that can broaden its field of view, it has become an effective way to meet its needs. Summary of the invention

[0003] The purpose of the present invention is to provide a larg...

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