Patent ID: 9578743
Date: 2017-02-21
CPC Classifications: H01L,H05K,Y02P

Claim:
1. A circuit board comprising: a multilayer body including a plurality of resin insulating layers and a plurality of conductor layers that are alternately stacked, wherein an outermost conductor layer of the plurality of conductor layers includes a plurality of terminals for connecting an electronic component to the circuit board by flip-chip bonding, wherein an outermost resin insulating layer of the plurality of resin insulating layers, at which the terminals are exposed, has an inner side adjacent to another one of the plurality of resin insulating layers, the outermost resin insulating layer defining a first opening exposing a first bottom surface and a second opening exposing a second bottom surface, wherein the terminals include a power supply terminal, a ground terminal, and a signal terminal, wherein the first opening of the outermost resin insulating layer also exposes a single terminal selected from the power supply terminal and the ground terminal, the terminal exposed by the first opening having a portion projecting from the first bottom surface, wherein the second opening of the outermost resin insulating layer also exposes two or more of the terminals including at least the signal terminal, wherein the outermost resin insulating layer further includes a reinforcing portion that defines the second bottom surface, the reinforcing portion having a height smaller than or equal to a height of the terminals exposed by the second opening and covering side surfaces of the terminals exposed by the second opening, wherein a surface of the outermost resin insulating layer or a surface of the another one of the resin insulating layers that is on the inner side of the outermost resin insulating layer defines the first bottom surface, and wherein a height of the portion of the terminal exposed by the first opening is greater than a difference between the height of the terminals exposed by the second opening and the height of the reinforcing portion.