| 摘要 |
<p>PURPOSE:To provide a multilayered printed beard harder to develop resin cracks than a prior art multilayered printed board using prepreg as the insulating layer, with a low permittivity, and harder to develop barrel cracks than a prior art multilayered printed board using an impregnated coating sheet, a coating sheet, or an impregnated sheet. CONSTITUTION:A multilayered printed wiring board which is a laminate of signal circuit layers 3 and a metal core 5 or other signal circuit layers 3 by means of insulating layers 4 is so constituted as to use a filler impregnated sheet made of a foaming fluororesin sheet impregnated with a vitreous filler 6 as the above-mentioned insulating layer 4.</p> |
