Patent ID: 7212242
Filing Date: 2007-05-01
Classification: G02B

Abstract:
1. An electronic image pickup system comprising a zoom lens and an electronic image pickup device located on an image plane side of said zoom lens, wherein said zoom lens comprises, in order from an object side, a first lens group comprising two lens components and having negative power as a whole and a second lens group comprising two lens components and having positive power as a whole wherein an air space between said first lens group and said second lens group is varied to vary focal length of the zoom lens, a total number of lens groups in the zoom lens is only two of the first lens group and the second lens group, a total number of lens components in the first lens group is two, a total number of lens components in the second lens group is two, wherein each of said lens components in the first lens group and the second lens group is a single lens, wherein said first lens group includes at least one surface in which the outermost periphery of an effective refracting surface portion is of concave shape in a direction opposite to a direction with a paraxial center of curvature found in said surface, and following conditions (d),(g),(j),(l) and (m) are satisfied: where A is equal to 43.2/L wherein L is a diagonal length of an effective image pickup area of the electronic image pickup device, t D f f R