Patent ID: 11877398
Assignee: IO TECH GROUP LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 15:
16. A method for fabricating a printed circuit board (PCB) assembly, comprising:
drilling or laser engraving one or more vias in a PCB substrate from a first side of the PCB substrate, the vias not extending through an entire thickness of the PCB substrate;
depositing, by laser-assisted deposition (LAD), a metal paste over at least a first portion of the PCB substrate and into the one or more vias to a first thickness, the depositing performed by jetting metal paste from a donor film on a first carrier substrate by an incident laser beam onto the PCB substrate and into the one or more vias, curing the metal paste deposited on the at least first portion of the PCB substrate and into the one or more vias, and sintering the deposited and cured metal paste using a same laser that was used for depositing the metal paste, and repeating the depositing, curing and sintering of the metal paste, thereby forming successive thicknesses thereof on the PCB substrate and in the one or more vias, until a desired thickness of the metal paste on the PCB substrate and in the one or more vias is reached;
printing a passivation layer by LAD on the desired thickness of metal paste on the PCB substrate and in the one or more vias, the printing performed by jetting epoxy from a second carrier substrate using the same laser that was used for depositing the metal paste, and curing the passivation layer; and
forming a solder mask by LAD over the passivation layer, the solder mask being formed by jetting mask material from a third carrier substrate using the same laser that was used for depositing the metal paste, and curing the solder mask.