Patent ID: 6466377
Filing Date: 2002-10-15
Classification: G02B

Abstract:
An image pickup lens system comprising a diaphragm, a first lens which has a convex face formed on the side of an image surface in the vicinity of an optical axis and which has a positive power and radii of curvature at a center, whose signs are not opposite from each other, a second lens which has a convex face formed on the side of an object in the vicinity of the optical axis and which has a negative power and radii of curvature at a center, whose signs are not opposite from each other, and a third lens which has a convex face formed on the side of the image surface in the vicinity of the optical axis and which has a positive power, said diaphragm and said first, second and third lenses being disposed sequentially from the side of the object, the first face of at least said second lens being formed into an aspherical shape.