| 摘要 |
PROBLEM TO BE SOLVED: To provide a thin filter holding mechanism that can fix a filter lens into a filter frame without generating distortions, and has a large effective diameter.SOLUTION: A caulking tongue part fitted and held to the rear of a filter lens front edge frame and holding a filter lens on a rear surface forms a ring-shaped cylindrical annular body by a support edge outer peripheral part. The cylindrical annular body of the caulking tongue part covers the chamfer part contact surface of the filter lens and has a length covering an antireflection coating surface edge part subjected to coating on the rear surface of the filter lens. |
