Wide-angle lens

摘要

A wide-angle lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, all of which are arranged in sequence from an object side to an image side along an optical axis. The first lens is with negative refractive power and includes a convex surface facing the object side. The second lens includes a convex surface facing the object side. The third lens is a biconvex lens. The fourth lens is a biconvex lens. The fifth lens is a biconcave lens. The sixth lens is a biconvex lens. The fourth lens and the fifth lens are cemented together to form a cemented lens.

主权项

1. A wide-angle lens consisting of:
a first lens which is with negative refractive power and comprises a convex surface facing the object side; a second lens which comprises a convex surface facing the object side; a third lens which is a biconvex lens; a fourth lens which is a biconvex lens; a fifth lens which is a biconcave lens; and a sixth lens which is a biconvex lens; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are arranged in sequence from an object side to an image side along an optical axis, wherein the fourth lens and the fifth lens are cemented together to form a cemented lens; wherein the sixth lens satisfies:
2.2377≦f6/f≦2.402 wherein f6 is an effective focal length of the sixth lens and f is an effective focal length of the wide-angle lens.