Patent ID: 7903341

Claim:
A lens array of an erecting unit magnification system, comprising: a first planar-shaped lens array plate that includes a plurality of a first outside lenses, which are regularly arranged on one side thereof, and a plurality of a first inside lenses, which are regularly arranged on the other side thereof; and a second planar-shaped lens array plate that includes a plurality of a second outside lenses, which are regularly arranged on one side thereof, and a plurality of a second inside lenses, which are regularly arranged on the other side thereof, wherein the first and the second planar-shaped lens array plates are stacked so that the first inside lens and the second inside lens are mutually faced, and each of the first and the second inside lenses has a first aspherical shape and is formed based on predetermined function so as to decrease the optical aberration of on-optical axis and off-optical axis, wherein the first aspherical shape is formed based on curvature correlation function f 1 ( ) between section radius r H and characteristic value, sin η, that correspond to predetermined viewing angle θ, where η is the angle between the tangential line of the first aspherical shape in the cross section of optical axis direction of the first aspherical shape and the vertical direction line with respect to the optical axis direction therein; r H is the section radius of the vertical direction to the optical axis direction of the first aspherical shape; and θ is the viewing angle provided for the first and the second planar-shaped lens array plates.