Patent ID: 7142377

Claim:
A lens-attached light-emitting element for structuring a light-emitting element array arranged in one dimension, comprising: a light-emitting element having an approximately U-shaped light-emitting area; and an approximately U-shaped composite lens including a combination of at least two cylindrical lenses arranged side by side in a direction of the one dimension and a plurality of partial spherical lenses, the composite lens being composed of a base portion having a fixed thickness and curved surface portions each upper surface thereof being curved in a predetermined radius of curvature; wherein when the width in a direction of the one dimension of the light-emitting area is p, the thickness of the base portion of the composite lens is in the range of 0–0.71 p, a radius of curvature of each of the cylindrical lens and partial spherical lens is in the range of 0.20 p–0.47 p, and a center-to-center distance between the at least two cylindrical lenses is in the range of 0.35 p–0.89 p.