| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem of a conventional printed circuit board that has deteriorated in signal transmission due to reflection in a part where an inter-line distance of a pair of differential signals and a part of surface mount terminals of a connector because of their high characteristic impedance although strict precision of the characteristic impedance of the printed circuit board is required. SOLUTION: A coadint film of a dielectric body 5 is applied to a part 33 that is an extended part of the inter-line distance to adjust the length of lines for a pair of differential signals so as to reduce the characteristic impedance of the coated part thereby suppressing deterioration in the signal transmission due to reflection. Furthermore, label forming onto a side of a printed circuit board and forming of a coating film for impedance adjustment are conducted by one silk printing process so as to prevent the manufacturing cost from being increased due to the addition of the coating film forming for the characteristic impedance adjustment.
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