The application provides a large-aperture middle-wave
infrared continuous
zoom optical
system capable of realizing
electromagnetic shielding, comprising a first front lens, a second front lens, a
zoom lens, a compensation lens, a focusing lens, a first
relay lens, a second
relay lens and a third
relay lens arranged in sequence along the
optical axis direction from the object side to the image side; the first and second front lenses are
meniscus positive lenses with convex surfaces facing the object side, the
zoom lens is a double-concave
silicon negative lens, the compensation lens is a double-convex
silicon positive lens, and the first, second and third relay lenses are a double-convex
silicon positive lens, a double-concave
germanium negative lens and a double-convex silicon positive lens in sequence. The secondary imaging configuration designed by the application improves the
optical axis consistency precision in the
full field of view during optical mechanical adjustment, and realizes clear imaging of an
infrared dim
small target with a large optical aperture. The outer side of the
light transmission area of each optical element extends outward with a modified extension structure, a
metal electrode is plated on the surface, and an antireflection film is plated on the
light transmission area, so that the imaging
system is suitable for a strong
electromagnetic environment.