Patent ID: 9063318
Filing Date: 2015-06-23
Classification: G02B

Abstract:
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 with positive refractive power having a convex surface on the object side near an optical axis; a second lens with positive refractive power having convex surfaces on the object side and the image side near the optical axis; a third lens with negative refractive power having a concave surface on the image side near the optical axis; a fourth lens having at least one aspheric surface; a meniscus fifth lens having a concave surface on the object side near the optical axis; a sixth lens as a double-sided aspheric lens; and a seventh lens as a double-sided aspheric lens with negative refractive power having a concave surface on the image side near the optical axis, wherein the lenses are not joined to each other.