Metal substrated printed circuit
First Claim
Patent Images
1. An electronic metal printed circuit board structure including in combination:
- a metal substrate;
an electrical insulation layer of plastic film having first and second sides;
conductive foil means bonded to the first side of said plastic film, said conductive foil means having a first predetermined thickness;
a heat dissipating conductor plate having a thickness greater than said first predetermined thickness attached to at least a portion of said conductive foil means;
semiconductor means mounted in heat exchanging proximity to said conductor plate;
bonding means selected from the group consisting of polyetherimide, polysulphone and polyethersulphone bonding the second side of said plastic film to said metal substrate, the combined thickness of said plastic film and said bonding means being less than twenty microns, and substantially less than the thickness of said conductor plate and said metal substrate, to permit heat dissipation into said metal substrate from said foil means and said conductor plate while providing electrical insulation between said substrate and said conductive foil means.
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Abstract
A semiconductor fabrication having thermal characteristics comparable to hybrid ceramic packages comprises a flexible copper foil printed circuit on a thin polyimide film layer thermally laminated to a metal surface, such as aluminum, with a high temperature thermal plastic, such as polyetherimide. A semiconductor die is attached to a relatively thick metal heat spreader which in turn is attached to at least a portion of the copper foil. The resultant structure is a semiconductor package which has a thermal performance comparable to that of typical hybrid ceramic packages.
123 Citations
44 Claims
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1. An electronic metal printed circuit board structure including in combination:
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a metal substrate; an electrical insulation layer of plastic film having first and second sides; conductive foil means bonded to the first side of said plastic film, said conductive foil means having a first predetermined thickness; a heat dissipating conductor plate having a thickness greater than said first predetermined thickness attached to at least a portion of said conductive foil means; semiconductor means mounted in heat exchanging proximity to said conductor plate; bonding means selected from the group consisting of polyetherimide, polysulphone and polyethersulphone bonding the second side of said plastic film to said metal substrate, the combined thickness of said plastic film and said bonding means being less than twenty microns, and substantially less than the thickness of said conductor plate and said metal substrate, to permit heat dissipation into said metal substrate from said foil means and said conductor plate while providing electrical insulation between said substrate and said conductive foil means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. An electronic metal printed circuit board structure including in combination:
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a metal substrate board; a polyimide film having first and second sides; a flexible, conductive foil printed circuit bonded to said first side of said polyimide film; bonding means selected from the group consisting of polyetherimide, polysulphone and polyethersulphone bonding the second side of said polyimide film to the surface of said metal substrate board, the thickness of said polyimide film and said bonding means being less than twenty microns to permit substantial heat dissipation into said metal substrate board from said conductive foil printed circuit while providing electrical insulation between said foil printed circuit and said board. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38)
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39. An electronic metal printed circuit board structure including in combination:
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a carrier layer of electrically insulating plastic film having first and second sides; a heat dissipating metal plate providing the structural rigidity for said structure, said plate having a thickness substantially greater than the thickness of said plastic film; bonding means selected from the group consisting of polyetherimide, polysulphone and polyethersulphone bonding said first side of said plastic film to said heat dissipating metal plate, the combined thickness of said bonding means and said plastic film being less than twenty microns; and at least one electrical conductor bonded to said second side of said plastic film opposite said metal plate, the thickness of said plastic film and said bonding means permitting substantial heat transfer therethrough from said second side thereof to said metal plate. - View Dependent Claims (40, 41, 42, 43, 44)
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Specification