Optical imaging lens

Abstract

An optical imaging lens includes a first lens element to a ninth lens element. An optical axis region of an image-side surface of the first lens element is concave, the fifth lens element has positive refracting power, and an optical axis region of an image-side surface of the seventh lens element is convex. The optical imaging lens includes only the above nine lens elements and further satisfies the following conditions: an Abbe number of the second lens element is smaller than an Abbe number of the sixth lens element, an Abbe number of the second lens element is smaller than an Abbe number of the seventh lens element, an Abbe number of the sixth lens element is smaller than or equal to an Abbe number of the ninth lens element, a thickness of the first lens element along the optical axis is greater than an air gap between the sixth lens element and the seventh lens element along the optical axis, and a thickness of the first lens element along the optical axis is greater than an air gap between the seventh lens element and the eighth lens element along the optical axis.

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