| 摘要 |
This invention relates to a method for preparing a lens or a lens array and apparatus for carrying out the method. The method comprises directing, in line of sight in a vacuum, the vapor of a substance, which is solid and transparent at ambient temperature, from a source of that vapor through a hole in a mask to form a deposit on a substrate. The mask is so positioned between the vapor source and the substrate that obscuration by the solid portions of the mask around the hole causes the deposit to assume a curved surface and function as a lens.
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