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Abstract

An miniature three-piece optical imaging lens with short back focal length, along an optical axis from the object side to the image side including: a first lens of positive refractive power that is a meniscus aspherical lens having a convex surface on the object side, an aperture stop, a second lens of negative refractive power that is a meniscus aspherical lens having a convex surface on the image side, a third lens of negative refractive power that is an aspherical lens whose center is on the optical axis, while on the lens center the convex surface is on the object side and the concave surface is on the image side. Moreover, from the center of the third lens element toward the edge, the refractive power changes from negative power, through an inflection point, to positive power. Furthermore, the optical imaging lens further satisfies conditions:wherein bf is back focal length, TL is total distance on the optical axis from the object side of the first lens to the image plane. Thereby, the imaging lens achieves effective aberration correction, high resolution and minimum total length.

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First Claim