| 摘要 |
PROBLEM TO BE SOLVED: To provide a lens array which comprises afocal optical systems and is capable of producing an unblurred optical image of an object. ! SOLUTION: A lens array 1 comprises distributed refractive index lenses 21 (afocal optical systems 2) having negative angular magnification, which are two-dimensionally arrayed on a plane perpendicular to an optical axis, each distributed refractive index lens 21 having a shielding mask 3 provided in contact with an exit end face 21b thereof. Each shielding mask 3 comprises a transmissive section 31 and shielding section 32, the shielding section 32 having a diameter Dom that equals a diameter Dol of the exit end face 21b of the respective distributed refractive index lens 21, and the transmissive section 31 having a diameter Da that is half the diameter Dom. Each shielding mask 3 is positioned in contact with the exit end face 21b of the respective distributed refractive index lens 21, which produces an aperture 22 Each aperture 22 has a diameter Da tha |
