Patent ID: 8743478

Claim:
A plurality of optical lenses for image pickup, sequentially arranged from an object side to an image side, with no intervening lenses, comprising: a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power; a third lens element with refractive power; a fourth lens element with positive refractive power having a convex object-side surface and a convex image-side surface, at least one of the object-side surface and the image-side surface being aspheric, and made of plastic; and a fifth lens element with negative refractive power having a concave image-side surface, and at least one of the object-side surface and the image-side surface being aspheric, having at least one inflection point, and made of plastic; wherein, R 7 is a curvature radius of the object-side surface of the fourth lens element, R 8 is a curvature radius of the image-side surface of the fourth lens element, and the following relation is satisfied: −1.0 <R 7 /R 8 <0.