| 摘要 |
PURPOSE:To form very small cylindrical lenses of the refractive index type in a given arrangement in a base plate in high accuracy, by diffusing an ion to increase a refractive index through a slit-shaped opening of a mask to positions of the glass base plate, then the opposite ion to other positions. CONSTITUTION:The top face of the glass base plate 1 is covered with the ion transmission preventing mask 2, and the mask 2 is provided with the plural thin and long slit- shaped opening parts 3 in a given arrangement. The mask face is brought into contact with a molten salt containing an ion having high electron polarizability, the salt and the base plate 1 are heated, an electric field is applied to the mask face as a positive electrode and the ion in the salt is diffused through the opening parts 3 into the base plate 1 to form the part 4 having a high refractive index. The mask 2 is then removed, the part 4 having high refractive index is provided with the mask 5, brought into contact with a molten salt containing an ion opposite to the above-mentioned ion, and an electric field in the opposite direction from the mask 5 is applied to it, to diffuse the ion in the salt to parts free form the mask 5. Thus the cylindrical part 6 having a high refractive index is formed, and the refractive index distribution is smoothed by heating. |
