ERECTING EQUAL-MAGNIFICATION LENS ARRAY UNIT, IMAGE READING APPARATUS, AND IMAGE FORMING APPARATUS

摘要

PROBLEM TO BE SOLVED: To expand the depth of field of the whole erecting equal-magnification lens array unit.SOLUTION: An erecting equal-magnification lens array unit 13 has a first lens array 17 and a second lens array 18. The first lens array 17 has a plurality of first lenses 20. The plurality of first lenses are arranged in a first direction in the first lens array 17. The first direction is perpendicular to the optical axis of the first lens 20. The second lens array 18 has a plurality of second lenses. The optical axis of the second lens is overlapped with the optical axis of the first lens. The plurality of second lenses are arranged in the first direction in the second lens array 18. The first lens 20 and the second lens having optical axes overlapping each other form an optical system.