Patent ID: 9735097
Date: 2017-08-15
CPC Classifications: H01L

Claim:
1. A method for making a package substrate comprising: providing a substrate comprising of a supporting plate, a resistant layer connected to at least one surface of the supporting plate, and a first copper layer connected to each resistant layer; etching each first copper layer by a hybrid etching process to form a first conductive wire layer having a first end portion adjacent to the resistant layer and a second end portion opposite to the first end portion, a width of the first end portion being greater than that of the second end portion; covering each first conductive wire layer with a copper substrate comprising an isolating layer and a second copper layer, the isolating layer filling in gaps formed by the first conductive wire layer, thereby embedding the first conductive wire layer within the isolating layer; thinning each second copper layer by a half etching process, and defining a plurality of blind holes in the thinned second copper layer to expose the first conductive layer; forming a copper plating layer on each thinned second copper layer, the copper plating layer being filled in the plurality of blind holes to form conductive portions; etching each copper plating layer and a portion of the second copper layer positioned under the copper plating layer by a hybrid etching process to form a second conductive wire layer having a third end portion facing the second end portion and a fourth end portion opposite to the third end portion, a width of the third end portion being greater than that of the fourth end portion, the second conductive wire layer being electrically connected to the first conductive wire layer by the conductive portions; removing each resistance layer and the supporting plate; and forming two solder mask layers on the first conductive wire layer and the second conductive wire layer, and defining a plurality of openings in each solder mask layer to expose the first end portion and the fourth end portion, thereby forming the package substrate.