| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact imaging lens which has brightness with an F-number of 2.5 or less, and achieves a wide angle of view, at low cost.SOLUTION: The imaging lens has a configuration comprising six optical elements, and comprises, in order from the object side: a first optical element group LG1 with a positive refractive power comprising a first lens L1 with a positive refractive power whose convex surface is directed toward the object side, and a second lens L2 with a negative refractive power whose concave surface is directed toward the image side; a second optical element group LG2 with a positive refractive power comprising a third lens L3 with a positive refractive power whose convex surface is directed toward the image side; and a third optical element group LG3 with a negative refractive power comprising a fourth lens L4 with a negative refractive power whose concave surface is directed toward the image side and whose both surfaces are aspherical, and a fifth lens L5 whose concave surface is directed toward the object side and whose both surfaces are aspherical. At least one inflection point is provided on the image side surface of the fourth lens L4 at a position other than the optical axis. An aberration correction optical element NE which has substantially no refractive power and whose both surfaces are aspherical is provided between the first optical element group LG1 and the second optical element group LG2. |
