Patent ID: 7463433

Claim:
An optical lens assembly comprising two plastic lenses with refractive power: from the object side to the image side: a first lens with positive refractive power, a front surface and a rear surface of the first lens being convex and aspherical, a refractive index N 1 of the first lens satisfies the relation: 1.6>N 1 >1.5, a focal length of the first lens is f 1 , and a focal length of optical system is f, and they satisfy the relation: f/f 1 >2.0; a second lens with negative refractive power, a front surface of the second lens being concave, a rear surface of the second lens being convex, and both the front and rear surfaces being aspherical, a refractive index N 2 of the second lens satisfies the relation: N 2 >1.55; wherein an aperture is located in front of the first lens for controlling the brightness of the optical system; the focal length of the second lens is f 2 , and the focal length of optical system is f, and they satisfy the relation: |f/f 2 |<1.0.