CIRCUIT BOARD AND PACKAGE SUBSTRATE COMPRISING SAME

    公开(公告)号:US20240138077A1

    公开(公告)日:2024-04-25

    申请号:US18271544

    申请日:2021-04-25

    IPC分类号: H05K3/46 H05K1/11 H05K3/00

    摘要: A circuit board according to an embodiment includes a first insulating layer; a second insulating layer disposed on the first insulating layer and including a cavity; a pad disposed on the first insulating layer and having a top surface exposed through the cavity; wherein the cavity of the second insulating layer includes: a bottom surface positioned higher than the top surface of the first insulating layer; and an inner wall extending from the bottom surface, wherein the inner wall includes: a first inner wall extending from the bottom surface and having a first inclination angle; and a second inner wall extending from the first inner wall and having a second inclination angle different from the first inclination angle.

    Method for fabricating asymmetric board

    公开(公告)号:US11917769B2

    公开(公告)日:2024-02-27

    申请号:US17768665

    申请日:2021-03-04

    IPC分类号: H05K3/46 H05K1/02 H05K3/00

    摘要: The present application relates to the technical field of circuit board fabricating, and provides a method for fabricating an asymmetric board, the method includes fabricating a master board, fabricating a second sub-board, thermal compression bonding the master board and the second sub-board, and milling an asymmetric board; further includes at least one of the following three steps: laying copper on the connection areas of the master board except for the second copper layer of an outermost layer to obtain laying copper area, removing 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 from a side of the second sub-board on each sub-board to obtain a depth control groove.

    PRINTED WIRING BOARD
    4.
    发明申请

    公开(公告)号:US20190215959A1

    公开(公告)日:2019-07-11

    申请号:US16245396

    申请日:2019-01-11

    申请人: IBIDEN CO., LTD.

    IPC分类号: H05K1/11 H05K3/46 H05K3/40

    摘要: A printed wiring board includes a core substrate, a first build-up layer, and a second build-up layer. The core substrate includes a core layer, through-hole conductors and through-hole lands. Metal foils of the through-hole lands in the core substrate have mat surfaces at interfaces of the core layer in the core substrate, metal foils of via lands in the build-up layers have inner mat surfaces at interfaces of insulating layers, and metal foils of outermost conductor layers in the build-up layers have outermost mat surfaces at interfaces of outermost insulating layers. Ten-point average roughness (RzI1) of the inner first mat surface is smaller than each of ten-point average roughness (Rz1, Rz2) of the mat surfaces and ten-point average roughness (RzO1, RzO2) of the outermost mat surfaces. Ten-point average roughness (RzI2) of the inner second mat surface is smaller than each of the ten-point average roughness (Rz1, Rz2, RzO1, RzO2).