Patent ID: 8850701

Claim:
A method for manufacturing a multilayer PCB having a mounting cavity, comprising: providing a PCB substrate, the PCB substrate comprising a base and a first circuit layer attached on the base, the first circuit layer comprising a mounting portion and an adjacent laminating portion; forming a first solder-resistant layer on the mounting portion; attaching a protective adhesive film on the first solder-resistant layer; laminating a first copper foil and a first adhesive layer on the PCB substrate, wherein the first adhesive layer defines a first opening and the protective adhesive film is positioned in the first opening; etching the first copper foil to form a second circuit layer, which comprises a first window spatially corresponding to the protective adhesive film; laminating a second copper foil and a second adhesive layer on the PCB substrate in such a manner that the second adhesive layer covers the first window and is sandwiched between the second circuit layer and the second copper foil; etching the second copper foil to form a third circuit layer, which comprises a second window spatially corresponding to a boundary of the protective adhesive film; forming a second solder-resistant layer on the third circuit layer, the second window being exposed from the second solder-resistant layer; defining a second opening in the second adhesive layer through the second window, the second window, the second opening, the first window, and the first opening communicating with each other and cooperatively constituting a cavity; and removing the protective adhesive film, thereby obtaining a multilayer PCB with a cavity.