Patent attributes
An objective lens for an endoscope, comprising a first lens group having a negative power, an aperture stop, and a second lens group having a positive power arranged in this order from an object side, wherein the first lens group comprises at least a negative front group lens having a concave surface facing an image side, and a positive front group lens having a convex surface facing the image side arranged in this order from the object side, and the second lens group comprises at least a positive rear group lens having a convex surface facing the image side and a cemented lens formed by cementing together a negative lens and a positive lens being arranged in this order from the object side, and wherein the objective lens for an endoscope is configured to satisfy a predetermined condition.
