Pickup lens

A pickup lens, mounted in an image pickup device comprising a solid-state image pickup element, the length of the diagonal line in the rectangular light-receiving area of which is 2Y,

• comprising an aperture diaphragm S1, a first lens L1, a second lens L2, and a third lens L3, and being configured by arranging in order, from an object side to an image side, said aperture diaphragm S1, said first lens L1, said second lens L2, and said third lens L3, and
• wherein said first lens L1 is a lens having positive refractive power, in a meniscus shape with a convex surface directed toward the object side;
• said second lens L2 is a lens having negative refractive power, in a meniscus shape with a convex surface directed toward the image side;
• said third lens L3 is a lens having negative refractive power, in a meniscus shape with a convex surface directed toward the object side;
• both surfaces of said first lens L1 are aspherical, both surfaces of said second lens L2 are aspherical, and both surfaces of said third lens L3 are aspherical;
• and
• the following conditions are satisfied:
• 0.57<f1/f<0.65 (1)
• 0.01≦r2/r3≦0.05 (2)
• 0.1≦d3/f<0.15 (3)
• 0.6<L/2Y<0.9 (4)
• where,
• f:
• combined focal length of said pickup lens
• f1:
• focal length of said first lens L1
• r2:
• radius of curvature of the object-side surface of said first lens L1 in the vicinity of the optical axis (radius of curvature at the optical axis)
• r3:
• radius of curvature of the image-side surface of said first lens L1 in the vicinity of the optical axis (radius of curvature at the optical axis)
• d3:
• interval between said first lens L1 and said second lens L2 along the optical axis
• L:
• distance in air along the optical axis from the object-side surface of said first lens L1 to the image plane (optical length)
• 2Y:
• length of a diagonal line of the rectangular light-receiving area of the solid-state image pickup element installed in the image plane of said pickup lens.