Electronic component device, and main board for circuit boards

摘要

The contours of openings of a solder resist defining exposed portions of electrode pads and the contours of openings of the solder resist defining the contours of register or patterns are simultaneously formed by photolithography using the same mask pattern. As a result, the patterns for registration can be easily formed on a main board or circuit boards. Also, it is possible to increase the positional accuracy of the register or patterns relative to the positions of the electrode pads.