| 摘要 |
PURPOSE:To provide a multi-layer board in which the inspections, whether inner layers constituting the multi-layer board is of a proper combination or not, the alignment is proper or not etc., can be mode easily. CONSTITUTION:In a multi-layer board where copper-foil layers 4a, 4b, 4c, and 4d and insulation material layers 5a, 5b, and 5c are laminated alternately and conductor patterns 7a, 7b, and 7c are placed on each copper-foil layer, characters 10b and 10c for check which are used as a pattern for check are provided at an unused portion of the copper-foil layer 4b and 4c at an inside of the multi-layer board, thus enabling the patterns 10b and 10c for board to be visually inspected from the outside of the multi-layer board. |
