| 摘要 |
PURPOSE:To finish a graphic original, etc., in soft tone so as to be easily visible without patching a screen by installing a bag-like body subjected to white screen processing on a pressure plate and setting the dot density of the white screen within a specific range. CONSTITUTION:The bag-like body 4 is installed on the surface of the pressure plate 2, and the original O to be subjected to a white dot screen can be attached and detached out of said bag-like body 4. The white screen processing, that is, white dot screen processing is applied on the outer surface of said body 4, and the density of the white dot of the screen is 4-8/mm, which means high density compared with a conventional density of 2-3/mm. The reason why to do so is that the density approximates the critical resolution of a copying device in the range of a space frequency of 4-8/mm. As a result, the density becomes higher, and a density drop will not occur, because a white dot is smeared in a black character and a black painted part. |
