| 摘要 |
PURPOSE:To make a titled lens lightweight and small-sized, and to correct satisfactorily a chromatic aberration by enclosing a liquid whose Abbe number is greatly different from that of a material of a plastic lens, into a lens-shaped vessel connected to said plastic lens, and using both the plastic lens and a liquid lens. CONSTITUTION:A titled lens is constituted by enclosing a liquid whose Abbe number nud is greatly different from that of a material of lenses 1, 10, 11, 20 and 21, into vessels 2, 13 and 22 which are connected to the plastic lenses 1, 10, 11, 20 and 21 and have a lens shape, and combining the lenses 1, 10, 11, 20 and 21, and liquid lenses 3, 14 and 23. Also, a pressure adjusting part 6 of the liquid is provided on a part of the vessel for forming the liquid lens. For instance, the lenses 1, 10, 11, 20 and 21 are formed by an acryl material, and as for the liquid, phenoxyethanol is used. A composite lens consisting of such an acryl convex lens and a liquid concave lens is capable of correcting a chromatic aberration because the dispersion value is greatly different. Also, since the pressure adjusting part is provided, a capacity variation caused by a temperature variation can be avoided, and the composite lens can be made lightweight and small-sized. |
