| 摘要 |
PROBLEM TO BE SOLVED: To accurately form an aperture part without deviations on a surface protective layer, for the purpose of connecting an electronic component, a connector and the like. SOLUTION: This surface protection layer 7 of a circuit substrate is formed while a part of a resist layer 3, to be used for formation of a circuit wiring pattern 2A, is used as a mask 5A for an aperture part 6 of the surface protective layer 7 used for the circuit wiring pattern 2A. An exposure mask 4 for exposing the resist layer 3 is formed in such a manner that the light transmittance of the part corresponding to the aperture part 6 of the surface protection layer 7 and the light transmittance of the part corresponding to the circuit wiring pattern 2A are different. |
