Patent ID: 8917457

Claim:
An imaging lens system comprising, in order from an object side, a positive first lens element, a positive second lens element convex to the object side, a negative third lens element, a fourth lens element, a fifth lens element, and a sixth lens element having at least one aspherical surface, wherein conditional formulae (A1), (A2), and (A3) below are fulfilled: 0.1 <Ton/Dopn< 7 (A1) 0.1<( Rona−Ronb )/( Rona+Ronb )<1.5 (A2) 0.3 <Y′/TL< 0.9 (A3) where Ton represents an axial thickness of a most object-side negative lens element; Dopn represents an axial distance between the most object-side negative lens element and a positive lens element located to an object side of and next to that negative lens element; Rona represents a paraxial radius of curvature of an object-side surface of the most object-side negative lens element; Ronb represents a paraxial radius of curvature of an image-side surface of the most object-side negative lens element; Y′ represents a maximum image height; and TL represents an axial distance from a vertex of a most object-side lens surface to an image surface, or where a parallel-plane plate is included, an air equivalent length.