Component-embedded printed wiring board

Abstract

A component-embedded printed wiring board (PWB) is disclosed. This PWB includes (a) a fluid-resin embedding section formed at a location corresponding to electronic components such that the embedding section covers the electronic components, (b) a resin flow-speed accelerator placed in parallel with a top face of a circuit board and surrounding the embedding section, and (c) bonding resin placed at least between the accelerator and the circuit board. The fluid resin embedding section is filled up with the same resin as the bonding resin. This structure allows the accelerator to compress the resin with pressure applied to the PWB, so that the resin tends to flow along the circuit board. As a result, the fluid-resin embedding section is thoroughly filled up with the resin without leaving any air, and the reliable PWB is thus obtainable.

1 . A component-embedded printed wiring board comprising:
 a circuit board;   an electronic component mounted to a top face of the circuit board;   a component embedding layer covering the electronic component and provided to the top face of the circuit board; and   a conductive pattern provided on the component embedding layer,   wherein the component embedded printed wiring board is formed by pressing the circuit board, the component embedding layer, and the conductive pattern together,   wherein the component embedding layer includes:
 a fluid-resin embedding section formed at a place corresponding to the electronic component for covering the electronic component; 
 a resin flow-speed accelerator provided in parallel with the top face of the circuit board and surrounding the fluid-resin embedding section; and 
 bonding resin disposed between the accelerator and the circuit board, and 
   wherein the fluid-resin embedding section is filled up with resin identical to the bonding resin.   
   
   
       2 . The component embedded printed wiring board of  claim 1 , wherein the resin flow-speed accelerator shapes like a board. 
   
   
       3 . The component embedded printed wiring board of  claim 2  further comprising a substrate-included resin section having a plurality of layers of the accelerators, wherein the substrate-included resin section has a resin layer formed of the bonding resin between the plurality of the accelerators. 
   
   
       4 . The component embedded printed wiring board of  claim 1 , wherein the accelerator is formed of one of woven fabric and non-woven fabric.