Patent 6903883 was granted and assigned to Olympus Group on June, 2005 by the United States Patent and Trademark Office.
Lenses 11, 12, and 13 having a power are layered in an optical axis direction such that flange section 11d and 12d are cemented so as to form an air interval between the lens 11 and the lens 12. A space between the lens 12 and the lens 13 are cemented together. A preferable interval is disposed in the optical axis direction by a positioning section which is disposed in each flange section.