Imaging lens

An imaging lens comprising, in order from an object side:

• a first lens having a positive refractive power and having a meniscus shape with a convex surface directed to the object side thereof;
• a second lens having a concave object-side surface;
• and
• a third lens that has a negative refractive power in a vicinity of an optical axis, wherein
• each of the second and third lenses has at least one aspheric surface, and
• the following conditional expressions are satisfied:
• 0.8<f1/f<1.2 (1)
• 11<|f2/f| (2)
• f3/f<−1.6 (7)
• 0<(|R2|−R1)/(|R2|+R1)≦0.39 (5′)
• where
• f denotes a focal length of the entire system,
• f1 denotes a focal length of the first lens,
• f2 denotes a focal length of the second lens, and
• f3 denotes a focal length of the third lens,
• R1 denotes a radius of curvature of the object-side surface of the first lens in the vicinity of the optical axis, and
• R2 denotes a radius of curvature of an image-side surface of the first lens in the vicinity of the optical axis.

An imaging lens comprising, in order from an object side:

• a first lens having a positive refractive power and having a meniscus shape with a convex surface directed to the object side thereof;
• a second lens having a concave object-side surface;
• and
• a third lens that has a negative refractive power in a vicinity of an optical axis, wherein
• each of the second and third lenses has at least one aspheric surface, and
• the following conditional expressions are satisfied:
• 0.8<f1/f<1.2 (1)
• 11<|f2/f| (2)
• 1.68<Nd2 (6)
• f3/f<−1.6 (7)
• where
• f denotes a focal length of the entire system,
• f1 denotes a focal length of the first lens,
• f2 denotes a focal length of the second lens,
• f3 denotes a focal length of the third lens, and
• Nd2 denotes a refractive index of the second lens at d-line of 587.6 nm in wavelength.