Patent ID: 7518809

Claim:
An ultra wide-angle imaging lens device comprising, in order from an object side: a negative first lens having a meniscus shape with a convex surface directed to the object side; a negative second lens having a concave surface directed to an image side and having at least one aspheric surface; a positive third lens having a convex surface directed to the object side and having at least one aspheric surface; a stop; and a positive fourth lens having a convex surface directed to the image side and having at least one aspheric surface, wherein the following conditional expression (1) is satisfied: −3.2 <L/f 34 <3.2 (1) where L denotes a distance on an optical axis from an object side surface of the first lens to an image formation surface, and f 34 denotes a composite focal length of the third and fourth lenses.