| 摘要 |
PURPOSE:To suppress unnecessary parasitic vibrations by curving the center part of a metallic thin piece which supports an optical lens elastically and has spiral winds around an optical axis. CONSTITUTION:An optical lens is fitted to a ring 32 and between rings 32 and 31, three spring pieces 33 are provided spirally. Each spring piece 33 swells up at its center part to form a curved part 41 continuing smoothly from flat parts 42 at both ends. This curved part absorbs the energy of parasitic vibrations efficiently and new parasitic vibrations of high order are never entailed because of the smooth succession of the curved part 41 to both the ends. |
