Patent ID: 9366841
Filing Date: 2016-06-14
CPC Classification: G02B

Claim Text:
1. An imaging lens comprising: a first lens having positive refractive power; a second lens having negative refractive power; a third lens having positive refractive power; a fourth lens having negative refractive power; a fifth lens having positive refractive power; and a sixth lens having negative refractive power, arranged in this order from an object side to an image plane side, wherein said first lens is formed in a shape so that an object side surface thereof is convex toward the object side near an optical axis thereof, said second lens is formed in a meniscus shape so that an object side surface thereof is convex toward the object side near an optical axis thereof, said third lens is formed in a shape so that an object side surface thereof is convex toward the object side near an optical axis thereof, and an image plane side surface thereof is convex toward the image plane side near the optical axis thereof, said fourth lens is formed in a meniscus shape so that an object side surface thereof is concave toward the object side near an optical axis thereof, and an image plane side surface thereof is convex toward the image plane side near the optical axis thereof, said fifth lens is formed in a shape so that an object side surface thereof has an aspheric shape having an inflexion point, said sixth lens is formed in a shape so that an image plane side surface thereof has an aspheric shape having an inflexion point, and each of said first lens, said second lens, said third lens, and said fourth lens has refractive power weaker than that of each of the fifth lens and the sixth lens.