Lens module

摘要

A lens module is disclosed. A lens module in accordance with an embodiment of the present invention includes a first lens, a second lens, a third lens, and a fourth lens that are arranged successively in the direction from an object side to an imaging surface, wherein the first lens has a positive refractive index, the second lens a negative refractive index, the third lens a positive refractive index, and the fourth lens a negative refractive index, wherein the third lens includes a first sub-lens, a second sub-lens, and a third sub-lens that have a positive refractive index, wherein the fourth lens includes a center portion surrounding an optical axis and a peripheral portion surrounding the center portion, wherein the center portion on the imaging surface side is formed in a concave shape and the peripheral portion on the imaging surface side is formed in a convex shape.

主权项

1. A lens module, comprising a first lens, a second lens, a third lens, and a fourth lens that are successively arranged in the direction from an object side to an imaging surface,
wherein the first lens has a positive refractive index, wherein the second lens has a negative refractive index, wherein the third lens has a positive refractive index, wherein the fourth lens has a negative refractive index, wherein the third lens comprises a first sub-lens that has a positive refractive index, a second sub-lens that has a positive refractive index, and a third sub-lens that has a positive refractive index, wherein the fourth lens comprises a center portion surrounding an optical axis and a peripheral portion surrounding the center portion, wherein the center portion on the imaging surface side is formed in a concave shape, and the peripheral portion on the imaging surface side is formed in a convex shape, wherein both surfaces of the first lens are convex, wherein an object side surface of the second lens is convex, and wherein both surfaces of the second sub-lens are convex.