Patent ID: 7110190

Claim:
An imaging lens, having an aperture diaphragm S 1 , first lens L 1 , second diaphragm S 2 , and second lens L 2 , and wherein said imaging lens is configured by positioning, in order from an object side to an image side, the aperture diaphragm S 1 , first lens L 1 , second diaphragm S 2 , and second lens L 2 ; said first lens L 1 has a meniscus shape with convex surface facing the object side, and has positive refractive power; said second lens L 2 has a meniscus shape with convex surface facing the object side, and has positive refractive power; and, both surfaces of said first lens L 1 and both surfaces of said second lens L 2 are aspherical, and satisfy the following conditions: 0.3 <f 1 /f 2 <1.0 (1) 0.4 <b f /f< 0.5 (2) 1.0 <d/f< 1.3 (3) 0.12 <D 2 /f< 0.30 (4) 2.0<F no <4.0 (5) where f is the combined focal length of the imaging lens, f 1 is the focal length of the first lens L 1 , f 2 is the focal length of the second lens L 2 , b f is the distance (in air) from the image-side surface of the second lens L 2 to the image plane, d is the distance (in air) from the object-side surface of the first lens L 1 to the image plane, D 2 is the interval between the first lens L 1 and the second lens L 2 , and F no is the F-number.