The invention discloses a large-image-surface and high-resolution video conference
optical imaging system. The large-image-surface and high-resolution video conference
optical imaging system sequentially comprises a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6 and a seventh lens 7 from the object surface to the image surface, wherein the first lensis a negative-focal-length lens, the object side of the first lens 1 is a convex surface, and the image side of the first lens 1 is a
concave surface; the second lens 2 is a positive-focal-length lens, the object side of the second lens 2 is a convex surface, and the image side of the second lens 2 is a
concave surface; the third lens 3 is a positive-focal-length lens, and both the object side and image side of the third lens 3 are convex surfaces; the sixth lens 6 is a positive-focal-length crescent lens, the object side of the sixth lens 6 is a
concave surface, and the image side of the sixth lens 6 is a convex surface; the seventh lens 7 is a negative-focal-length lens, the object surface and the image surface of the seventh lens 7 are nonspherical surfaces, and the image surface of the seventh lens 7 is provided with at least one inflexion point. The large-image-surface and high-resolution video conference
optical imaging system has the advantages that the seven lenses combining nonspherical, spherical and adhering lens are adopted, the height of a
photographic plate is IMC, the total
focal length of the optical lenses is f, 0.4<f / IMC<0.5, and IMC>17mm; large-dimension imagingrequirements are satisfied, high-resolution imaging of 21 million pixels is achieved, and clear imaging is achieved.