Patent ID: 8373936

Claim:
An image sensing lens comprising, in an order below along a direction from an object to an image surface: an aperture stop; a first lens having a positive refracting power; a second lens having a negative refracting power; a third lens having a positive refracting power; and a fourth lens having a negative refracting power, the second lens having an image-side surface facing the image surface, the image-side surface being a concave surface, the third lens being a meniscus lens having an image-side surface facing the image surface, the image-side surface being a convex surface, the fourth lens having (i) an object-side surface facing the object, the object-side surface being a concave surface, and (ii) an image-side surface facing the image surface, the image-side surface being concave at a central portion and convex at a peripheral portion around the central portion, the image-side surface of the third lens being an aspheric surface, the object-side surface and the image-side surface of the fourth lens being each an aspheric surface, the image sensing lens satisfying Formulae (1) through (3) below, 0.51 <f 1/ f <0.78 (1) −1.63 <f 2 /f <−0.97 (2) v 1− v 2>20 (3), where f is a focal length of the image sensing lens; f 1 is a focal length of the first lens; f 2 is a focal length of the second lens; v 1 is an Abbe number of the first lens; and v 2 is an Abbe number of the second lens, wherein: the image sensing lens satisfies Formulae (4) and (5) below, 0.91 <f 3/ f< 1.89 (4) −0.9 <f 4/ f <−0.49 (5), where f 3 is a focal length of the third lens; and f 4 is a focal length of the fourth lens.