IMAGING LENS AND IMAGING DEVICE USING THE SAME

摘要

Provided is an imaging lens composed of four lenses, which is compact (small and thin), low-cost and is applicable to high pixel imaging elements of megapixel or more to be mounted in small mobile products such as a cellular phone and the like.  An imaging lens (7) is provided with, in the following order from the object side toward the image side, an aperture stop (5), a first lens (1) having a positive power, a second lens (2) which has a negative power and is composed of a meniscus lens having a concave lens surface on the image side, a third lens (3) which has a positive power and is composed of a meniscus lens having a convex lens surface on the image side, and a fourth lens (4) which has a negative power and aspheric lens surfaces on the both sides with a concave lens surface at the vicinity of the optical axis on the image side.  On one lens surface of the first lens (1) or on one lens surface of the second lens (2), a diffraction optical element is formed.