Copper clad laminate for forming of embedded capacitor layer, multilayered printed wiring board, and manufacturing method of multilayered printed wiring board
A material for forming of the capacitor layer which generates no crack in drilling on the dielectric layer of the capacitor in manufacturing of a highly multilayered printed wiring board embedded a capacitor circuit. Copper clad laminate for forming of an embedded capacitor layer of a multilayered printed wiring board including an embedded capacitor circuit having a layer structure of copper layer/dielectric layer of the capacitor/copper layer in an inner layer characterized in that the composite elastic modulus Er of the resin film constituting the dielectric layer of the capacitor along the thickness direction is less than 6.1 GPa is employed.
1. A multilayered printed wiring board embedded a capacitor circuit comprising a through-hole bored by drilling and an embedded capacitor layer including an embedded capacitor circuit,
characterized in that a composite elastic modulus Er measured by a nanoindentation method of a resin film constituting a dielectric layer of the capacitor in the embedded capacitor circuit along the thickness direction is less than 6.1 GPa
wherein
the dielectric layer of the capacitor constituting the embedded capacitor layer has a layer structure of resin layer/resin film layer/resin layer,
a thickness of the resin film layer is within a range of 0.5 μm to 25 μm, and
a thickness of the resin layer is in a range of 0.1 μm to 10 μm.
2. The multilayered printed wiring board embedded a capacitor circuit according to claim 1 , wherein
the electrode circuits provided on both sides of the dielectric layer of the capacitor is 18 μm to 105 μm thick copper layer.
3. The multilayered printed wiring board embedded a capacitor circuit according to claim 1 , wherein
thickness of the dielectric layer of the capacitor is 30 μm or less.
4. The multilayered printed wiring board embedded a capacitor circuit according to claim 1 , wherein
the multilayered printed wiring board embedded a capacitor circuit has total thickness of 1.8 mm or more and 8 or more layers.
5. The multilayered printed wiring board according to claim 1 , wherein the composite elastic modulus is measured by a nanoindentation method with an assumed Poisson's ratio of 0.3.
6. The multilayered printed wiring board according to claim 1 , wherein a copper layer is provided on each side of the dielectric layer.
7. The multilayered printed wiring board according to claim 1 , wherein a thickness of the dielectric layer of the capacitor is 30 μm or less.
8. The multilayered printed wiring board according to claim 1 , wherein a thickness of the dielectric layer of the capacitor is from 12 μm to 30 μm.
9. The multilayered printed wiring board according to claim 1 , wherein a thickness of the resin film layer is thicker than a sum of the thicknesses of the two resin layers.
10. The multilayered printed wiring board according to claim 1 , wherein the thickness of the resin film layer is within a range of 2 μm to 20 μm.
11. The multilayered printed wiring board according to claim 1 , wherein the thickness of the resin layer is within a range of 2 μm to 7 μm.