Patent ID: 11902644
Assignee: AVARY HOLDING (SHENZHEN) CO., LIMITED.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  G | IPC H

Claim 10:
11. The method of claim 10, wherein providing a circuit board assembly comprises:
providing a double-sided copper clad laminate, the double-sided copper clad laminate comprising the first dielectric layer and two first copper layers on both surfaces of the first dielectric layer;
forming two first inner wiring layers from the two first copper layers to obtain the first inner wiring substrate, each of the two first inner wiring layers comprising a plurality of areas, each of the plurality of areas comprising one of the plurality of coils;
forming two second inner wiring layers from the two first copper layers to obtain the second inner wiring substrate;
laminating a first single-sided copper clad laminate onto one of the two first inner wiring layers and one of the two second inner wiring layers which are on a same surface of the first dielectric layer, the first single-sided copper clad laminate comprising a second dielectric layer and a second copper layer on a surface of the second dielectric layer; and
etching the second copper layer to form an outer wiring layer, thereby obtaining the outer wiring substrate.