Thermal stress relieving substrate
First Claim
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1. A chip carrier comprising:
- a substrate with a coefficient of thermal expansion compensation plate having means to provide a variable in-plane stiffness to accommodate thermal expansion mismatch between elements on the substrate to either side of the compensation plate.
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Abstract
A substrate for connecting one element having a first coefficient of thermal expansion to another element having a differing coefficient of thermal expansion that will alleviate interconnection problems due to thermal mismatch.
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Citations
13 Claims
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1. A chip carrier comprising:
- a substrate with a coefficient of thermal expansion compensation plate having means to provide a variable in-plane stiffness to accommodate thermal expansion mismatch between elements on the substrate to either side of the compensation plate.
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2. A chip carrier comprises:
- a substrate with a coefficient of thermal expansion plate having means to provide a variable in-plane stiffness to accommodate thermal expansion mismatch of elements attached to said substrate.
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3. A thermal stress relieving device comprising:
- a plate constructed so as to have a variable in-plane stiffness from its inner areas to its outer periphery.
- View Dependent Claims (4, 5, 6, 7, 8)
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9. A method to reduce the thermal expansion mismatch between one element and a second element, said method comprising the steps of:
- constructing a substrate using a low coefficient of thermal expansion plate, determining the coefficient of thermal expansion of said one element and said second element, selectively removing portions of the plate so that the in-plane stiffness of said plate will constrain the thermal expansion of the substrate differently in respective areas of attachment of said one element and said second element.
- View Dependent Claims (10, 11, 12, 13)
Specification