Patent ID: 8237891

Claim:
A micro lens array in which a plurality of micro lenses, each formed from an aspheric lens, is disposed two-dimensionally on a substrate, wherein for each micro lens, the focal distance f of the micro lens and distance Ts from a main surface of the micro lens to a substrate surface upon which light is incident meet the following relationships: X=Ts/ √{square root over (2)} P Y=f/ √{square root over (2)} P where P is a pitch of the micro lenses and is X and Y are within an X-Y coordinate system surrounded by point sets (0.75, 1.00), (0.75, 1.25), (1.00, 1.75), (1.75, 2.50), (2.25, 2.50), (2.25, 2.00), (1.50, 1.25), (1.00, 1.00) so that a distance k from the end of an area where a domain takes place is within a range of ⅓ to ⅕ of the pitch P so that no light will enter the domain-occurring area.