Patent ID: 7599131

Claim:
An imaging system comprising: in order from an object side of the imaging system, an aperture diaphragm; and an imaging lens consisting of a first lens, a second lens and a third lens, said first lens having a positive refractive power and having a convex surface on the object sides, said second lens having a negative refractive power and having a concave surface on the object side, said third lens having a meniscus shape having a convex surface on the object side in the vicinity of an optical axis thereof, the third lens having a negative refractive power in the vicinity of the optical axis thereof, each of the first lens, the second lens and the third lens having at least one aspherical surface, and the imaging lens satisfying conditional expressions: 0.9 <|f 2 /f|< 11 (1) 1.2 <|f 3 /f|< 100 (2) wherein f represents a focal length of the imaging lens; f 2 represents a focal length of the second lens; and f 3 represents a focal length of the third lens.