OPTICAL IMAGING LENS

摘要

Present embodiments provide for an optical imaging lens. The optical imaging lens may comprise five lens elements positioned sequentially from an object side to an image side. By controlling the convex or concave shape of the surfaces of the lens elements and designing parameters satisfying at least one inequality, the view angle of the optical imaging lens may be increased to achieve better optical characteristics.

主权项

1. An optical imaging lens, sequentially from an object side to an image side along an optical axis, comprising first, second, third, fourth and fifth lens elements, each of said first, second, third, fourth and fifth lens elements having refractive index, 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 negative refractive index, and said object-side surface thereof comprises a convex portion in a vicinity of the optical axis; said second lens element has positive refractive index, and said object-side surface thereof comprises a concave portion in a vicinity of the optical axis; said object-side surface of said third lens element comprises a convex portion in a vicinity of the optical axis; said object-side surface of said fourth lens element comprises a concave portion in a vicinity of the optical axis; said object-side surface of said fifth lens element comprises a convex portion in a vicinity of the optical axis; the optical imaging lens comprises no other lenses having refractive index beyond said five lens elements; and an air gap between said first lens element and said second lens element along the optical axis is represented by G12, an air gap between said second lens element and said third lens element along the optical axis is represented by G23, and G12 and G23 satisfy the inequality:
G12/G23≧2.05.