Patent ID: 7038861

Claim:
An image-pick up lens comprising: from a side of an object: an aperture stop; a biconvex positive lens; and a meniscus lens having a concave surface on the object side, wherein, when each of the lenses has at least one aspheric surface; and ‘f indicates a focal length of all systems, ‘f 1 ’ indicates a focal length of the positive lens, and ‘T’ indicates a length from the aperture stop to an image-pick up surface: 0.3 <f 1 / f <0.9 and T/f <2.4; and wherein, when at least one of the positive lens and the meniscus lens is aspheric on both surfaces and R 1 indicates a curvature radius of the positive lens on the object side, R 2 indicates a curvature radius of the positive lens on a side of an image, and R 3 indicates a curvature radius of the meniscus lens on the object side: 0< R 2 /R 1 <0.5 and 0.4< R 3 /R 2 <1.0.