| 摘要 |
An impression body for depicting microstructures comprises a copy layer 2 with an overlying contrast-enhancing optical layer 1, the copy layer being a dried soluble film of cellulose triacetate, homogeneously dispersed in a solvent such as acetone, having a thickness of 1 to 15 mu m and rigidly connected to a support 3. Preferably, the homogeneous dispersion is obtained by swelling the film material in the solvent, freeze-cooling the mixture and then bringing to room temperature whilst agitating; the film is applied to the microstructured surface by spraying, painting or splashing and then allowed to dry; a plate, disc or roll support is formed or applied, and the resulting impression body lifted away. The optical layer of metal or metal alloy is applied by sputtering, vacuum evaporation or chemical deposition. A single support can carry the microstructure impressions on both sides, Fig 3. Stated uses are when impressions are needed for micro-fissured mechanically loaded large area components, and for microstructured large area data carriers. <IMAGE> |
