Multilayer wiring board incorporating carbon fibers and glass fibers

1. A multilayer wiring board comprising:

a core portion including: a carbon fiber reinforced portion composed of a carbon fiber material and resin composition, and an in-core wiring portion which has a laminated structure of at least one insulating layer containing a glass fiber material and a wiring pattern composed of a conductor having an elastic modulus of 10 to 40 GPa, the in-core wiring portion being bonded to the carbon fiber reinforced portion; and

an out-core wiring portion which has a laminated structure of at least one insulating layer and a wiring pattern, the out-core wiring portion being bonded to the core portion at the in-core wiring portion,

wherein

the carbon fiber reinforced portion has a first coefficient of thermal expansion, the in-core wiring portion having a second coefficient of thermal expansion which is greater than the first coefficient of thermal expansion, the out-core wiring portion having a third coefficient of thermal expansion which is greater than the second coefficient of thermal expansion.

2. A multilayer wiring board comprising:

a core portion including: first and second in-core wiring portions each having a laminated structure of at least one insulating layer and a wiring pattern, the insulating layer containing a glass fiber material, the wiring pattern composed of a conductor having an elastic modulus of 10 to 40 GPa, and a carbon fiber reinforced portion which is composed of a carbon fiber material and resin composition and is interposed between the first in-core wiring portion and the second in-core wiring portion;

a first out-core wiring portion which has a laminated structure of at least one insulating layer and a wiring pattern and is bonded to the core portion at the first in-core wiring portion; and

a second out-core wiring portion which has a laminated structure of at least one insulating layer and a wiring pattern and is bonded to the core portion at the second in-core wiring portion,

wherein

the carbon fiber reinforced portion has a first coefficient of thermal expansion, each of the first and second in-core wiring portions having a second coefficient of thermal expansion which is greater than the first coefficient of thermal expansion, each of the first and second out-core wiring portions having a third coefficient of thermal expansion which is greater than the second coefficient of thermal expansion.

3. A multilayer wiring board comprising:

a core portion which includes: first and second carbon fiber reinforced portions each composed of a carbon fiber material and resin composition, a glass fiber reinforced portion which is composed of a glass fiber material and resin composition and is interposed between the first carbon fiber reinforced portion and the second carbon fiber reinforced portion, a first in-core wiring portion which has a laminated structure of at least one insulating layer and a wiring pattern, the insulating layer containing a glass fiber material, the wiring pattern composed of a conductor having an elastic modulus of 10 to 40 GPa, the first in-core wiring portion being bonded to the first carbon fiber reinforced portion at a side opposite from the glass fiber reinforced portion, and a second in-core wiring portion which has a laminated structure of at least one insulating layer and a wiring pattern, the insulating layer containing a glass fiber material, the wiring pattern composed of a conductor having an elastic modulus of 10 to 40 GPa, the second in-core wiring portion being bonded to the second carbon fiber reinforced portion at a side opposite from the glass fiber reinforced portion;

a first out-core wiring portion which has a laminated structure of at least one insulating layer and a wiring pattern and is bonded to the core portion at the first in-core wiring portion; and

a second out-core wiring portion which has a laminated structure of at least one insulating layer and a wiring pattern and is bonded to the core portion at the second in-core wiring portion,

wherein

the carbon fiber reinforced portion has a first coefficient of thermal expansion, each of the first and second in-core wiring portions having a second coefficient of thermal expansion which is greater than the first coefficient of thermal expansion, each of the first and second out-core wiring portions having a third coefficient of thermal expansion which is greater than the second coefficient of thermal expansion.

4. The multilayer wiring board according to claim 1 , wherein the core portion includes a through-hole via which extends in a thickness direction of the core portion and is coated with an insulating material.

5. The multilayer wiring board according to claim 1 , wherein the conductor is electrolytic copper foil or rolled copper foil.

6. The multilayer wiring board according to claim 1 , wherein the resin composition of the carbon fiber reinforced portion contains filler.

7. The multilayer wiring board according to claim 6 , wherein the content of the filler in the resin composition is 5 to 30 vol %.

8. The multilayer wiring board according to claim 6 , wherein the filler comprises SiO2, Si3N4, Al2O3, AlN, ZrO2, mullite, borosilicate glass, aluminosilicate glass, alumino-borosilicate glass, quartz glass, or carbon black.

9. The multilayer wiring board according to claim 1 , wherein the carbon fiber material is in the form of a mesh, cloth, nonwoven fabric, or chopped fiber, or has a cross-laminated structure of a unidirectional carbon fiber sheet.

10. The multilayer wiring board according to claim 1 , wherein the content of the carbon fiber material in the carbon fiber reinforced portion is 30 to 80 vol %.