| 摘要 |
<p>Flat electro-luminescent screens etc., are produced by vacuum deposition, through masks, of a number of different layers. The sample to be coated is located in a carrier, which can be rotated in a vacuum chamber. On the carrier is mounted a disc, around which the masks are cut. When the carrier is stopped, in the right position in the chamber, a rod may be engaged with the axis carrying the disc. The disc can then be rotated to position the required mask over the sample. The rod is retracted and the mask is held against the sample by a spring. It is located by an indexing peg on the carrier engaging in a hole in the disc. Changing masks without releasing the vacuum and opening the chamber considerably reduces changers of pollution at the interfaces of the layers. It also saves time.</p> |
