Patent ID: 8854740
Filing Date: 2014-10-07
Classification: G02B

Abstract:
1. A zoom lens, in order along an optical axis from an object side to an image side, comprising: a first lens group having positive refractive power, and including a first lens, a second lens, a third lens, and a fourth lens, wherein the first lens is a meniscus lens with negative refractive power, and a convex surface thereof faces the object side; the second lens is a flat lens; the third lens is a biconvex lens with positive refractive power, and has at least an aspheric surface; and the fourth lens is a biconvex lens with positive refractive power; a second lens group having negative refractive power, and including a fifth lens, a sixth lens, and a seventh lens, wherein the fifth lens is a biconcave lens with negative refractive power, and has at least an aspheric surfaces; the sixth lens is a biconcave lens with negative refractive power; the seventh lens is a meniscus lens with positive refractive power, and a convex surface thereof faces the object side; and the sixth lens and seventh lens are coupled together to form a compound lens; a third lens group having positive refractive power, and including an eighth lens, wherein the eighth lens is a meniscus lens with positive refractive power, and a convex surface thereof faces the object side; and the eighth lens has at least an aspheric surface; an aperture; a fourth lens group having positive refractive power, and including a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, and a thirteenth lens, wherein the ninth lens is a biconvex lens with positive refractive power, and has an aspheric surface; the tenth lens is a meniscus lens with positive refractive power, and a convex surface thereof faces the object side; the eleventh lens is a meniscus lens with negative refractive power, and a convex surface thereof faces the object side; the tenth lens and eleventh lens are coupled together to form a compound lens with positive refractive power; the twelfth lens is a biconvex lens with positive refractive power; the thirteenth lens is a biconcave lens with negative refractive power; and the twelfth lens and the thirteenth lens are coupled together to form a compound lens with positive refractive power; and a fifth lens group having positive refractive power, and including a fourteenth lens, wherein the fourteenth lens is a biconvex lens with positive refractive power, and has at least an aspheric surface; wherein the zoom lens is switched to a telephoto mode from a wide-angle mode by moving the second lens group and the fourth lens group toward the third lens group.