| 摘要 |
An optical lens assembly comprises two plastic lenses with refractive power: from the object side to the image side: a first lens with positive refractive power, and a second lens with negative refractive power. A front surface and a rear surface of the first lens is convex and aspherical, a refractive index N1 of the first lens satisfies the relation: 1.6>N1>1.5, a focal length of the first lens is f1, and a focal length of optical system is f, and they satisfy the relation: f/f1>2.0. A front surface of the second lens is concave, a rear surface of the second lens is convex, and both the front and rear surfaces is aspherical, a refractive index N2 of the second lens satisfies the relation: N2>1.55. An aperture is located in front of the first lens for controlling the brightness of the optical system.
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