Long-focal length apochromatic optical lens applicable to long-distance imaging

Abstract

The invention relates to the optical lens technical field and relates to a long-focal length apochromatic optical lens applicable to long-distance imaging. The optical lens includes a first lens group, an aperture diaphragm, a second lens group, a third lens group and an image plane which are distributed sequentially along the incident direction of light; the first lens group includes a first refraction positive lens, a first refraction negative lens, a second refraction positive lens and a second refraction negative lens which are distributed sequentially; the second lens group includes a third refraction positive lens and a third refraction negative lens; and the third lens group includes a fourth refraction positive lens and a fourth refraction negative lens. According to the meter-scale apochromatic optical lens of the invention is realized based on a simple Petzval structure. The apochromatic optical lens has the advantages of large relative aperture, small relative distortion, excellent on-axis and off-axis imaging quality, high consistency and the like.

Description

technical field [0001] The invention relates to the technical field of optical lenses, and specifically discloses a long focal length apochromatic optical lens suitable for long-distance imaging. Background technique [0002] In many application fields, in order to obtain high resolution and good image plane illumination, the optical imaging system is required to have a large aperture and a long focal length; in addition, due to the development and progress of detection devices, the spectral response range is getting wider and wider. Put forward the demand of wide spectrum band. For long-focal-length high-resolution optical imaging lenses based on the principle of refraction, the secondary spectrum is an important factor restricting the imaging quality, and its correction is the focus and difficulty in optical design. [0003] For the catadioptric optical system, its total reflection front group has the inherent advantage of chromatic aberration correction and can share mos...

AI Technical Summary

Problems solved by technology

However, the field of view of the total reflection system is difficult to enlarge, the processing is difficult, the cost is high, or there are factors such as central occlusion that affect the imaging quality and detection ability

The advantage of the refraction system is that there is no obstruction, it is easy to achieve a large field of view, the processing and adjustment methods are conventional, the system is stable, and the stray light is easy to control; the disadvantage is that the size is limited and the secondary spectrum correction is difficult

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