Patent ID: 9103963
Filing Date: 2015-08-11
Classification: G02B,H04N

Abstract:
1. A rod lens array configured by arranging a plurality of rod lenses each having a gradient index in a radial direction in one row with an interval of arrangement pitch 2R so that optical axes of the rod lenses are parallel to each other, wherein, when a relation between R and r 0 is set to be R≧r 0 ≧0.8R and the gradient index of the rod lens is approximate to n(r) 2 =n 0 2 {1−(g·r) 2 }, an overlap degree m defined by m=X 0 /2R is more than 2.5 and an aperture angle of the rod lens represented by n 0 ·g·r 0 is 0.1 or more and less than 0.22, and wherein r represents a distance from an optical axis, n(r) represents a refractive index at a position of the distance r from the optical axis, n