公开(公告)号：US3853564A

公开(公告)日：1974-12-10

申请号：US23086672

申请日：1972-03-01

Applicant: FOTEL INC

Inventor： BAKER E

IPC: H05K3/00 ,  G03C5/04

CPC classification number: H05K3/0002 ,  H05K2201/09936 ,  H05K2203/056

Abstract: A master grid layout sheet and methods of manufacture associated therewith are disclosed for use in graphic art work such as the layout and reproduction of printed circuits and the like. In typical printed circuit work precision art work and subsequent photographic reproduction thereof are normal intermediate processing steps. The master sheet includes a pattern, usually of orthogonal reference lines, printed thereon in a predetermined critical gray or neutral monotone. The monotone has a visual density such that the reference line pattern is visible to a draftsman but the light transmission density or opacity thereof is insufficient to cause the pattern to be reproduced in a controlled photographic reproduction of the master sheet.

Abstract translation: 公开了主网格布局表和与之相关联的制造方法用于图形艺术作品中，例如印刷电路的布局和再现等。 在典型的印刷电路工作中，精密艺术作品及其随后的照相再现是正常的中间处理步骤。 母片包括通常以正交参考线的图案，其印刷在预定的临界灰色或中性单调体中。 单调子具有视觉密度，使得参考线图案对于绘图员是可见的，但是其透光密度或不透明度不足以在母版的受控照相再现中导致图案再现。