IMAGING LENS

摘要

An imaging lens includes a first lens group having positive refractive power and a second lens group having negative refractive power, arranged in this order from an object side to an image plane side. The first lens group includes a first lens having positive refractive power, a second lens having positive refractive power, and a third lens having negative refractive power. The second lens group includes a fourth lens having positive refractive power, a fifth lens, and a sixth lens having negative refractive power. The first lens and second lens have specific focal lengths. The first to third lenses have specific Abbe's numbers.

主权项

1. An imaging lens comprising:
a first lens group having positive refractive power; and a second lens group having negative refractive power, arranged in this order from an object side to an image plane side, wherein said first lens group includes a first lens having positive refractive power, a second lens having positive refractive power, and a third lens having negative refractive power, said second lens group includes a fourth lens having positive refractive power, a fifth lens, and a sixth lens having negative refractive power, and said first lens has a focal length f1, said second lens has a focal length f2, said first lens has an Abbe's number νd1, said second lens has an Abbe's number νd2, and said third lens has an Abbe's number νd3 so that the following conditional expressions are satisfied:
0.3