Patent ID: 7106506

Claim:
A lenticular lens sheet comprising a light-emission surface provided with lens elements, a black strip portion being provided at each border between the lens elements, wherein each lens element is connected to the side wall via a portion of connection that, when viewed in a cross section perpendicular to the lens element, has a width A which is greater than 0 and which is equal to or less than 15 μm, and wherein said portion of connection is defined by two border portions, one of which is a point at which a curvature imparted to the lens element ends and the other of which is a point at which a flat plane of the side wall ends, wherein when it is assumed that P represents the pitch of the lens element; and H represents the width of the black stripe portion when viewed in a cross section perpendicular to the lens element, the difference F in height between the black stripe portion and the lens element is set to have a range that is expressed by the inequality: 0.098 P≦F ≦( P−H )/2 tan (π/3) and wherein the width B as measured from an apex portion of the black stripe portion in regard to a colored portion on a side wall of the black ships portion is set to have a range that is expressed by the inequality: 0.30 F≦B≦0.89 F.