| 摘要 |
<p>1335624 Photo-printing masters R C A CORPORATION 20 May 1971 [21 May 1970] 16102/71 Heading G2M Matching photo-printing masters each having an array of uniform elemental areas, in which the areas in each master are in exact mutual alignment but differ in size or size and shape from those in other masters, are prepared by (1) making an original master containing opaque outlines of the areas required for each printing master arranged in the desired pattern, and (2) photographically printing replicas from each outline while masking off the other outlines. Specifically the masters are matched pairs of dots of different radii for making shadow masks for colour television tubes.</p> |
