Patent ID: 9678306
Date: 2017-06-13
CPC Classifications: G02B

Claim:
1. An imaging lens composed of six optical elements which forms an image of an object on a solid-state image sensor, in which the elements are arranged in order from an object side to an image side, the imaging lens comprising: a first optical element group with positive refractive power including: a second optical element group with positive refractive power including a fourth lens with positive refractive power having a convex surface on the image side as a fourth optical element; and a third optical element group with negative refractive power including a double-sided aspheric fifth lens with negative refractive power having a concave surface on the image side as a fifth optical element, wherein at least one pole-change point is formed off an optical axis on the image-side surface of the fifth lens; and a double-sided aspheric aberration correction optical element which has a flat surface near the optical axis with virtually no refractive power as a sixth optical element is located in an air gap nearer to an image plane than the first optical element group.