IMAGING LENS

摘要

A low-cost imaging lens which corrects aberrations properly with a small F-value, ensures high performance with a larger number of constituent lenses and has a more low-profile design than before. The constituent lenses are arranged in the following order from an object side to an image side: a first lens having a convex object-side surface near an optical axis; a positive second lens; a negative third lens having a convex object-side surface near the optical axis; a fourth lens having at least one aspheric surface; a fifth lens as a double-sided aspheric lens; a sixth lens as a double-sided aspheric lens; and a seventh lens as a double-sided aspheric lens having a concave image-side surface near the optical axis. These constituent lenses are not joined to each other.

主权项

1. A fixed-focus imaging lens composed of seven lenses to form an image of an object on a solid-state image sensor, in which the lenses are arranged in order from an object side to an image side, comprising:
a first lens having a convex surface on the object side near an optical axis; a second lens with positive refractive power; a third lens with negative refractive power having a convex surface on the object side near the optical axis; a fourth lens having at least one aspheric surface; a fifth lens as a double-sided aspheric lens; a sixth lens as a double-sided aspheric lens; and a seventh lens as a double-sided aspheric lens having a concave surface on the image side near the optical axis, wherein the lenses are not joined to each other.