| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive and simple structure optical system for focusing two wavelengths, which simultaneously focuses the light of two wavelengths incident on the same one lens. SOLUTION: The optical system is equipped with a lens that transmits a visible light and an infrared light. A first coating material that reflects the infrared light and transmits the visible light is deposited in the central part of the lens, and a second coating material that reflects the visible light and transmits the infrared light is deposited in the peripheral part. The radius of curvature is different between the surfaces to which the first and the second coating materials are deposited respectively, and the infrared light and the visible light are focused on generally the same surface. COPYRIGHT: (C)2006,JPO&NCIPI |
