Patent ID: 9681535
Date: 2017-06-13
CPC Classifications: H05K

Claim:
1. An assembled board comprising: an insulating board including a plurality of product regions disposed in a central portion and a marginal region surrounding the central portion, the marginal region disposed in an outer peripheral portion; a conductor layer disposed on an upper surface side and a lower surface side of the insulating board corresponding to the product regions and the marginal region, the conductor layer having a volume different between the upper surface side and the lower surface side; and a solder resist layer laminated from the central portion to the outer peripheral portion of the upper and lower surfaces of the insulating board, wherein a plurality of openings are formed in the solder resist layer on a surface on a side with a smaller volume of the conductor layer so that a volume in the marginal region of the solder resist layer becomes smaller than a volume in the marginal region of the solder resist layer on a surface on an opposite side.