DENSIFIED FOAM FOR THERMAL INSULATION IN ELECTRONIC DEVICES
First Claim
1. A heat spreading and insulating material comprising:
- an insulating layer formed from a densified sheet of polyimide open cell foam, said densified sheet having a first density between 25-60 kg/m3, said densified sheet having an outwardly facing surface and an oppositely located inwardly facing surface, said outwardly facing surface being spaced from said inwardly facing surface to define a first thickness;
said insulating layer having further densified areas where said outwardly facing surface is spaced from said inwardly facing surface to define a second thickness, said second thickness being smaller than said first thickness;
a first adhesive layer having a first adhesive surface and an oppositely located second adhesive surface, said inwardly facing surface of said insulating layer adheredly contacting said first adhesive surface;
a heat spreading layer formed from a material that conducts heat and having an adhesive facing surface and an oppositely located component facing surface, said adhesive facing surface separated from said component facing surface to define a thickness, said adhesive facing surface adheredly contacting said second adhesive surface of said first adhesive layer.
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Accused Products
Abstract
A heat spreading and insulating material using densified foam is provided that has a heat spreading layer that is adhered to an insulating layer. The material is designed to be used with mobile devices that generate heat adjacent to heat sensitive components. The insulating layer is formed from a compressed layer of polyimide foam to increase its density. The polyimide foam retains a significant amount of insulating properties through the densification process. In some embodiments, an EMI shielding layer is added to improve electrical properties of the device. The heat spreading layer is commonly a graphite material with anisotropic heat properties that preferentially conduct heat in-plane. The material may also include pressure sensitive layers to permanently apply the material to the mobile device.
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Citations
15 Claims
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1. A heat spreading and insulating material comprising:
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an insulating layer formed from a densified sheet of polyimide open cell foam, said densified sheet having a first density between 25-60 kg/m3, said densified sheet having an outwardly facing surface and an oppositely located inwardly facing surface, said outwardly facing surface being spaced from said inwardly facing surface to define a first thickness; said insulating layer having further densified areas where said outwardly facing surface is spaced from said inwardly facing surface to define a second thickness, said second thickness being smaller than said first thickness; a first adhesive layer having a first adhesive surface and an oppositely located second adhesive surface, said inwardly facing surface of said insulating layer adheredly contacting said first adhesive surface; a heat spreading layer formed from a material that conducts heat and having an adhesive facing surface and an oppositely located component facing surface, said adhesive facing surface separated from said component facing surface to define a thickness, said adhesive facing surface adheredly contacting said second adhesive surface of said first adhesive layer. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A heat spreading and insulating material comprising:
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an insulating layer formed from a densified sheet of polyimide closed cell foam, said densified sheet having a first density between 25-60 kg/m3, said densified sheet having an outwardly facing surface and an oppositely located inwardly facing surface, said outwardly facing surface being spaced from said inwardly facing surface to define a first thickness; a first adhesive layer having a first adhesive surface and an oppositely located second adhesive surface, said inwardly facing surface of said insulating layer adheredly contacting said first adhesive surface; a heat spreading layer formed from a material that conducts heat and having an adhesive facing surface and an oppositely located component facing surface, said adhesive facing surface separated from said component facing surface to define a thickness, said adhesive facing surface adheredly contacting said second adhesive surface of said first adhesive layer. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification