Multi-layer circuit board with thermal diffusion and method of fabricating the same
First Claim
1. A multi-layer circuit board having a stacked-layer structure, comprising:
- an outer layer;
a first inner layer; and
a second inner layer, which comprises the same material as the first inner layer, a third layer disposed between said first and second inner layers, the third inner layer comprising a different material than said first and second inner layers;
wherein the first inner layer and the second inner layer have a different thickness from each other.
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Accused Products
Abstract
A multi-layer circuit board having an improved heat spreading performance is described. In a multi-layer circuit board structure configured such that insulating layers and interconnection conductive layers are alternately stacked, the interconnection conductive layers include a top interconnection conductive layer having a main surface on which circuit elements are mounted, a bottom interconnection conductive layer as a bottom surface layer facing the top interconnection conductive layer, an inner power conductive layer having a predetermined thickness, disposed between the top interconnection conductive layer and the bottom interconnection conductive layer, with some of the insulating layers interposed between the top and bottom interconnection conductive layers. The interconnection conductive layers can be of various thicknesses to facilitate heat diffusion. Heat diffusion can be accomplished with variations in thickness of either the insulating layers or electrically conductive layers. Heat diffusion performance is improved in comparison with a conventional circuit board assembly, thereby minimizing or reducing sizes of elements of a heat diffuser, or omitting the installation of a heat diffuser.
20 Citations
39 Claims
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1. A multi-layer circuit board having a stacked-layer structure, comprising:
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an outer layer;
a first inner layer; and
a second inner layer, which comprises the same material as the first inner layer, a third layer disposed between said first and second inner layers, the third inner layer comprising a different material than said first and second inner layers;
wherein the first inner layer and the second inner layer have a different thickness from each other. - View Dependent Claims (2, 3, 4, 5, 8, 9, 10)
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6. A multi-layer circuit board comprising:
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an outer layer composed of a conductive material;
a first inner layer composed of a conductive material; and
a second inner layer composed of a conductive material, wherein the first inner layer'"'"'s continuous cross sectional thickness is greater than the second inner layer'"'"'s continuous cross sectional thickness.
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7. A multi-layer circuit board comprising:
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an outer layer comprising a conductive material;
a first inner layer comprising a conductive material; and
a second inner layer comprising a conductive material, wherein the first inner layer'"'"'s minimum thickness is greater than the second inner layer'"'"'s minimum thickness.
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11. A multi-layer circuit board comprising:
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a first outer layer composed of a conductive material;
a first inner layer composed of a conductive material;
a second inner layer composed of a conductive material;
a second outer layer composed of a conductive material;
a third inner layer composed of a conductive material; and
a fourth inner layer composed of a conductive material, wherein the first inner layer is thicker than the second inner layer, and the fourth inner layer is thicker than the third inner layer. - View Dependent Claims (12)
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13. A multi-layer circuit board comprising:
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a first inner layer for transmitting power; and
a second inner layer for transmitting signals, wherein the first inner layer is thicker than the second inner layer. - View Dependent Claims (14)
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15. A multi-layer circuit board comprising:
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a first inner layer for transmitting power;
a second inner layer for transmitting signals;
a third inner layer for transmitting signals; and
a fourth inner layer for transmitting power, wherein the first inner layer is thicker than the second inner layer, and the fourth inner layer is thicker than the third inner layer.
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16. A method of fabricating a multi-layer circuit board comprising:
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forming a first inner layer, comprising a conductive material, with a predetermined thickness; and
forming a second inner layer, comprising a conductive material, with a thickness smaller than that of the first inner layer.
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17. A printed circuit board having a memory module mounted thereon comprising:
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an outer layer;
a first inner layer; and
a second inner layer comprising the same material as the first inner layer, wherein the first inner layer and the second inner layer have different thicknesses. - View Dependent Claims (18, 19, 20, 27, 28)
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21. A printed circuit substrate having a memory module mounted thereon comprising:
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an outer layer comprised of a conductive material;
a first inner layer comprised of a conductive material; and
a second inner layer comprised of a conductive material, wherein the first inner layer is thicker than the second inner layer.
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22. A multi-layer circuit board structure configured such that insulating layers and interconnection conductive layers are alternately stacked, wherein
among the interconnection conductive layers, at least one inner interconnection conductive layers, is of a different thickness than at least one other inner conductive layer which are disposed under an outer interconnection conductive layer having a main surface on which circuit elements are capable of being mounted.
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24. A multi-layer circuit board structure configured such that insulating layers and interconnection conductive layers are alternately stacked, wherein
the interconnection conductive layers comprise: -
a top interconnection conductive layer having a main surface to which circuit elements are operatively connected;
a bottom interconnection conductive layer facing the top interconnection conductive layer;
an inner power conductive layer, having a predetermined thickness, disposed between the top interconnection conductive layer and the bottom interconnection conductive layer; and
an inner signal routing conductive layer, having a thickness less than that of the inner power conductive layer, disposed between the inner power conductive layer and the bottom interconnection conductive layer. - View Dependent Claims (25)
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26. A method of fabricating a multi-layer circuit board configured such that insulating layers and interconnection conductive layers are alternately stacked, comprising forming inner interconnection conductive layers between outer conductive layers, wherein at least one inner interconnection conductive layers is formed thicker than at least one other inner interconnection conductive layers, thereby improving heat spreading performance of the multi-layer circuit board.
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29. A multi-layer circuit board structure configured such that insulating layers and interconnection conductive layers are alternately stacked, wherein
the interconnection conductive layers comprise: -
a top interconnection conductive layer having a main surface on which circuit elements are capable of being mounted;
a bottom interconnection conductive layer as a bottom surface layer facing the top interconnection conductive layer;
an inner power conductive layer having a first predetermined thickness, disposed between the top interconnection conductive layer and the bottom interconnection conductive layer, with insulating layers interposed between the top and bottom interconnection conductive layers; and
an inner signal routing conductive layer disposed between the inner power conductive layer and the bottom interconnection conductive layer, having a second predetermined thickness greater than said first predetermined thickness. - View Dependent Claims (30, 31)
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32. A multi-chip module structure having electronic circuit elements mounted thereon and using a multi-layer circuit board configured such that insulating layers and interconnection conductive layers are alternately stacked, comprising:
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outer interconnection conductive layer having a main surface on which the electronic circuit elements are mounted;
inner interconnection conductive layers disposed under said outer interconnection conductive layer, wherein at least one thickness of an inner interconnection layer has a thickness different from at least one other inner interconnection layer;
a heat diffuser installed between a surface of a package of some of the electronic circuit elements and a surface of the multi-layer circuit board, for diffusing heat generated by operation of the electronic circuit elements out of the circuit board. - View Dependent Claims (33, 34, 35, 36)
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37. A method of forming a multi-layered circuit board comprising:
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determining the number of conductive and insulating layers in the multi-layered circuit board;
forming selected layers to be of a relatively different thickness than other layers. - View Dependent Claims (38, 39)
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Specification