3 results about "Low distortion" patented technology

The invention discloses a vision lens with a wide working distance and a high resolution ratio. The lens comprises a focusing group GA and a fixing group GB, wherein the focusing group GA and the fixing group GB are arranged in sequence from an objective end to an image surface; the focusing group GA comprises a first lens G1, a second lens G2, a first bonding lens group U1, a second bonding lensgroup U2 and a seventh lens G7; the focal lengths of an optical system, the focusing group GA and the fixing group GB are independently f, fGA and fGB, the combined focal length of the first lens G1,the second lens G2 and the first bonding lens group U is f(G1-G4), and the combined focal length of the second bonding lens group U2 and the seventh lens G7 is f(G5-G7), wherein the above focal lengths independently meet the following relational expression: fGA / f is greater than 1 and less than 1.4, fGB / f is greater than 3 or less than 4, f(G1-G4) / f is greater than 2.0 and less than 2.6, and f(G5-G7) / f is greater than 0.6 and less than 1.0. The lens has the characteristics of high resolution ratio and low distortion and can support the working distance from 0.1m to infinity.