Patent ID: 7457053

Claim:
A subminiature imaging optical system comprising: a first lens having a positive refractive power and comprising a first lens part having a convex object-side surface, a second lens part having an object-side surface in contact with an image-side surface of the first lens part, and a third lens part having an object-side surface in contact with an image-side surface of the second lens part and a concave image-side surface, about an optical axis; and a second lens comprising a fourth lens part having an object-side surface with a convex center and a concave peripheral portion, a fifth lens part having an object-side surface in contact with an image-side surface of the fourth lens part, and a sixth lens part having an object-side surface in contact with an image-side surface of the fifth lens part, the sixth lens part having an image-side surface with a concave center and a convex peripheral portion, about the optical axis.