Imaging lens, and electronic apparatus including the same

摘要

An imaging lens includes first to fifth lens elements arranged from an object side to an image side in the given order. Through designs of surfaces of the lens elements and relevant lens parameters, a short system length of the imaging lens may be achieved while maintaining good optical performance.

主权项

1. An imaging lens comprising an aperture stop, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element arranged in order from an object side to an image side along an optical axis of said imaging lens, each of said first lens element, said second lens element, said third lens element, said fourth lens element and said fifth lens element having a refractive power, an object-side surface facing toward the object side, and an image-side surface facing toward the image side, wherein:
said first lens element has a positive refractive power, and said object-side surface of said first lens element is a convex surface that has a convex portion in a vicinity of the optical axis and a convex portion in a vicinity of a periphery of said first lens element; said second lens element has a negative refractive power, and said object-side surface of said second lens element has a concave portion in a vicinity of a periphery of said second lens element; said image-side surface of said third lens element has a concave portion in a vicinity of the optical axis; said object-side surface of said fourth lens element has a concave portion in a vicinity of a periphery of said fourth lens element, said fourth lens element has a positive refractive power, and said image-side surface of said fourth lens element has a convex portion in a vicinity of the optical axis; said object-side surface of said fifth lens element has a convex portion in a vicinity of the optical axis, and said image-side surface of said fifth lens element has a concave portion in a vicinity of the optical axis, and a convex portion in a vicinity of a periphery of said fifth lens element; said imaging lens does not include any lens element with a refractive power other than said first lens element, said second lens element, said third lens element, said fourth lens element and said fifth lens element; said imaging lens satisfies T4/G34≧1.60, where T4 represents a thickness of said fourth lens element at the optical axis, and G34 represents an air gap width between said third lens element and said fourth lens element at the optical axis; and said imaging lens further satisfies T4/G23≧3.00, where G23 represents an air gap width between said second lens element and said third lens element at the optical axis.