Patent ID: 9360656
Filing Date: 2016-06-07
CPC Classification: G02B,H04N

Claim Text:
1. An imaging lens comprising: a first lens having negative power, a second lens having negative power, a third lens having positive power, and a fourth lens having positive power arranged in order from an object side toward an image side, wherein the fourth lens is a cemented lens composed of an object side lens having negative power and an image side lens having positive power, and is provided with a resin adhesive layer bonding the object side lens and the image side lens together; an image side lens surface of the object side lens and an object side lens surface of the image side lens have different aspheric shapes; and following conditional expressions (1) and (2) are satisfied, where D represents a thickness of the adhesive resin layer along an optical axis, Sg1H represents sag at height H in an effective diameter of the image side lens surface of the object side lens in a direction orthogonal to the optical axis, and Sg2H represents sag in an object side lens surface of the image side lens at height H.