Patent ID: 7694415
Filing Date: 2010-04-13
Classification: H01L,H05K,Y10T

Abstract:
1. A method of manufacturing a component-embedded printed wiring board in which a plurality of electronic components are embedded, the method comprising the steps of: providing a sheet made of resin and a resin flow-speed accelerator with a hole; mounting the plurality of electronic components on a top face of a circuit board; after the mounting step, layering the resin flow-speed accelerator on the sheet such that the hole surrounds periphery of the electronic components; and after the layering step, unifying the sheet and the circuit board together by heating and pressing; wherein the unifying step compresses a unit formed by laminating the circuit board and the resin flow-speed accelerator to move bonding resin disposed between the resin flow-speed accelerator and the circuit board to the hole, so that the hole is filled up with the bonding resin; wherein the sheet includes thermosetting resin which is shaped like a board within a first temperature range, and has thermal fluidity in a second temperature range higher than the first range, and is hardened in a third temperature range higher than the second range; and wherein the unifying step includes: (a-1) a first heating step for heating the sheet to the second temperature range and softening the resin, and then (a-2) a forcible flow-in step which forcibly charges the resin into a space formed between the electronic components and the circuit board by compressing the sheet before the sheet is heated to the third temperature range, and then (a-3) a second heating step for heating the sheet to the third temperature range, wherein the temperature rises slower in the forcible flow-in step than in the first heating step.