IMAGING LENS

摘要

A compact high-resolution imaging lens which meets the demands for low-profileness, a low F-value and a wide field of view and corrects aberrations properly. It includes, in order from the object side: a first positive lens having a convex object-side surface; a second negative lens having a convex object-side surface; a third lens; a fourth positive lens; and a fifth negative double-sided aspheric lens having a concave image-side surface. When Fno denotes F-number, ih maximum image height, TTL total track length, f45 the composite focal length of the fourth and fifth lenses, r5 and r6 the curvature radii of the third lens object-side and image-side surfaces, r7 and r8 the curvature radii of the fourth lens object-side and image-side surfaces, and r9 and r10 the curvature radii of the fifth lens object-side and image-side surfaces, respectively, it satisfies the following conditions: Fno≦2.4; TTL/2ih<0.9; f45<0; 0

主权项

1. An imaging lens which forms an image of an object on a solid-state image sensor, comprising, in order from an object side to an image side:
a first lens with positive refractive power having a convex surface on the object side; a second lens with negative refractive power having a convex surface on the object side; a third lens with positive or negative refractive power; a fourth lens with positive refractive power; and a fifth lens with negative refractive power as a double-sided aspheric lens having a concave surface on the image side, wherein conditional expressions (1) to (6) below are satisfied:
Fno≦2.4  (1)TTL/2ih<0.9  (2)f45<0  (3)0f45: composite focal length of the fourth lens and the fifth lensr5: curvature radius of the object-side surface of the third lensr6: curvature radius of the image-side surface of the third lensr7: curvature radius of the object-side surface of the fourth lensr8: curvature radius of the image-side surface of the fourth lensr9: curvature radius of the object-side surface of the fifth lensr10: curvature radius of the image-side surface of the fifth lens.