Ultra wide-angle imaging lens device and imaging apparatus

摘要

An ultra wide-angle imaging lens device 1 includes, in order from an object side: a negative first lens L1 having a meniscus shape with a convex surface directed to the object side; a negative second lens L2 having a concave surface directed to an image side and having at least one aspheric surface; a positive third lens L3 having a convex surface directed to the object side and having at least one aspheric surface; a stop; and a positive fourth lens L4 having a convex surface directed to the image side and having at least one aspheric surface. The following conditional expression (1) is satisfied: <?in-line-formulae description="In-line Formulae" end="lead"?>-3.2<L/f34<3.2 (1)<?in-line-formulae description="In-line Formulae" end="tail"?> where L denotes a distance on an optical axis from an object side surface of the first lens to an image formation surface, and f34 denotes a composite focal length of the third and fourth lenses L3 and L4.