Invention Grant
- Patent Title: Multilayer printed wiring board production method, adhesive layer-equipped metal foil, metal-clad laminate, and multilayer printed wiring board
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Application No.: US15751218Application Date: 2016-08-10
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Publication No.: US10893616B2Publication Date: 2021-01-12
- Inventor: Hitoshi Onozeki , Tsubasa Inoue , Katsuji Yamagishi , Hiroshi Shimizu
- Applicant: HITACHI CHEMICAL COMPANY, LTD.
- Applicant Address: JP Tokyo
- Assignee: HITACHI CHEMICAL COMPANY, LTD.
- Current Assignee: HITACHI CHEMICAL COMPANY, LTD.
- Current Assignee Address: JP Tokyo
- Agency: Fitch, Even, Tabin & Flannery, LLP
- Priority: JP2015-158992 20150811,JP2015-158994 20150811
- International Application: PCT/JP2016/073513 WO 20160810
- International Announcement: WO2017/026501 WO 20170216
- Main IPC: H05K3/38
- IPC: H05K3/38 ; G03F7/20 ; H05K3/46 ; H05K3/00 ; C09J163/00 ; G03F7/26 ; H05K3/06 ; H05K3/18 ; H05K3/42 ; G03F7/038 ; H05K1/11

Abstract:
Disclosed is a production method of a multi-layered printed wiring board, including the following steps 1 to 3: Step 1: a step of laminating, on a substrate with inner layer circuit, a metal foil with adhesive layer including a support, a metal foil having a thickness of 3 μm or less and ⅙ or less relative to the thickness of the inner layer circuit, and an organic adhesive layer having a thickness of 10 μm or less in this order, via an organic insulating resin layer such that the organic insulating resin layer and the organic adhesive layer are opposed to each other, and then releasing the support to form a laminated sheet (a) having the metal foil as an outer layer metal foil layer; Step 2: a step of irradiating the laminated sheet (a) with a laser to bore the outer layer metal foil layer, the organic adhesive layer, and the organic insulating resin layer to form a bored laminated sheet (b) having a blind via hole; and Step 3: a step of forming an outer layer circuit connected with the inner layer circuit through the following steps 3-1 to 3-4: Step 3-1: a step of etching removing the outer layer metal foil layer of the bored laminated sheet (b) formed in the step 2 and then forming an outer layer copper layer having a thickness of 2 μm or less on the bored laminated sheet (b); Step 3-2: a step of forming a resist pattern by a resist applied on the outer layer copper layer; Step 3-3: a step of forming a circuit layer on the surface of the outer layer copper layer on which the resist pattern is not formed, by electrolytic copper plating; and Step 3-4: a step of removing the resist pattern and then removing the exposed outer layer copper layer by etching, thereby forming an outer layer circuit connected with the inner layer circuit.
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