Patent ID: 8711494

Claim:
An imaging lens comprising first, second, and third lens elements arranged in order from an object side to an image side, wherein: said first lens element has a positive refracting power, and has a convex object-side surface facing toward the object side; said second lens element has a concave object-side surface facing toward the object side, and a convex image-side surface facing toward the image side; and said third lens element has an image-side surface facing toward the image side, having a concave portion in a vicinity of an optical axis of said imaging lens; wherein said third lens element is interposed between said second lens element and an image plane; wherein said imaging lens satisfies |v 1 −v 2 |<5, and |v 1 −v 3 |>20, where v 1 , v 2 , and v 3 respectively represent dispersion coefficients of said first, second, and third lens elements; wherein said imaging lens further satisfies L BF <1.072 mm, where L BF represents a shortest distance between a center point of said image-side surface of said third lens element and said image plane, with said center point of said image-side surface of said third lens element coincides with said optical axis of said imaging lens; and wherein said first lens element further has an image-side surface facing toward the image side; and said imaging lens further satisfies 0.30 mm<S 12 <0.65 mm, where S 12 represents a distance between a center point of said image-side surface of said first lens element and a center point of said object-side surface of said second lens element, the center point of said image-side surface of said first lens element and the center paint of said object-side surface of said second lens element coincides with the optical axis of said imaging lens.