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

Claim 0:
1. 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;
wherein the method for fabricating the asymmetric board further comprises the following three steps:
laying copper; in the step of fabricating the master board, laying copper on the connection areas of the master board except for the second copper layer of an outermost layer to obtain laying copper areas;
digging copper; in the step of fabricating the second sub-board, digging copper on the connection areas of the third copper layer; 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.