Patent ID: 7733582

Claim:
A compound imaging lens comprising: a first lens, a second lens, and a third lens disposed sequentially in this order, the first lens disposed toward an object, and the third lens disposed toward an image surface; wherein the first lens has a meniscus shape, a positive refraction, and a convex surface, the convex surface facing the object; the second lens has a meniscus shape and a concave surface, the concave surface facing the object; the third lens has a convex-type surface facing the object, and a concave-type aspherical surface facing the image surface, the concave-type aspherical surface configured to provide a negative refraction in a radially central portion and a positive refraction in a radially peripheral portion; and a condition 0.016 <Δ/f< 0.018 (1) is satisfied, where Δ is defined as an absolute value of longitudinal chromatic aberrations at Fraunhofer F curve and C curve wavelengths, and f is defined as a combined focal distance of the entire compound imaging lens.