Patent ID: 11054630

Abstract:
Camera lens system for an endoscope, method for producing same and endoscope. The system includes at least three lenses. Starting from object side, first lens is a negative lens, and lenses moving toward an image side are positive lenses, with features: 45<V1d<75; |V1d−V2d|<10; |V1d−V3d|<10; |V2d−V3d|<10; 1.45<n1d<1.75; |n1d−n2d|<0.1; |n1d−n3d|<0.1; |n2d−n3d|<0.1; diagonal field of view from 80°-100°; 0.4<f<0.7; −3<f1/f<−2; 1.1<f2/f<1.3; 2.5<f3/f<3.5, the three lenses having V1d, V2d, and V3d Abbe numbers, n1d, n2d, and n3d refractive indices, f1, f2, and f3 focal lengths, respectively, and f is focal length of the objective of the system.