| 摘要 |
PURPOSE:To obtain pattern layout of a printed board on a manufacturing standard length which is free of plating variability affected by the position of each printed board when gold-plating a matrix printed board to be used for a telephone exchange system. CONSTITUTION:In a manufacturing standard length of a printed board which comprises a plurality of identical matrix circuits 1 to 4 which are laid out in parallel to each other and laminate a plurality of patterns, forming a through hole at their intersecting points, the standard length is horizontally divided into two sections or virtual regions A and B by a linear boarder line of the manufacturing standard length. The matrix circuits are divided into two groups, say, 1 and 2:3 and 4 and laid out in each virtual region A and B respectively so that the matrix circuits may be symmetric respectively with regards to a specific point S on the boarder line. |
