Patent ID: 11917769
Assignee: SHENZHEN KINWONG ELECTRONIC CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 14:
15. A method for fabricating an asymmetric board, comprising:
fabricating a master board, wherein the master board comprises at least one first sub-board, each first sub-board comprises a first insulating layer, and a first copper layer and a second copper layer disposed on opposite sides of the first insulating layer;
fabricating a second sub-board, wherein the second sub-board comprises a second insulating layer, and a third copper layer and a fourth copper layer disposed on opposite sides of the second insulating layer, and material of the first insulating layer is different from that of the second insulating layer;
thermal compression bonding, laminating the master board and the second sub-board after placing a prepreg between the master board and the second sub-board, wherein the third copper layer is located on a side of the second sub-board away from the master board, the second copper layer is located on a side of the first sub-board away from the second sub-board, and the asymmetric board is formed by thermal compression bonding the master board and the second sub-board; a plurality of sub-boards are formed on the asymmetric board, and the plurality of sub-boards are connected; each sub-board comprises a plurality of secondary sub-boards, connection areas are correspondingly formed between one sub-board and another sub-board, between one secondary sub-board and another secondary sub-board, as well as between the secondary sub-board and a board edge of the asymmetric board on each of the first copper layer, the second copper layer, the third copper layer, and the fourth copper layer; and
milling the asymmetric board, performing milling at the connection areas between one sub-board and another sub-board, the connection areas between the sub-board and the board edge, and the connection areas between one secondary sub-board and another secondary sub-board, to obtain the plurality of sub-boards, and each sub-board comprises a plurality of secondary sub-boards connected to each other; and
after the step of milling the asymmetric board, on each of the sub-boards, performing depth control milling at the connection areas between one secondary sub-board and another secondary sub-board from a side of the second sub-board to obtain a depth control groove.