Printed wiring board substrates for ceramic chip carriers
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United States of America Patent
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Mar 9, 1982
Grant Date -
N/A
app pub date -
Feb 9, 1981
filing date -
Feb 9, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A composite printed wiring board is provided wherein the surface of the board is fabricated from conventional fiber reinforced plastic laminates such as glass fiber reinforced epoxy laminates and that laminate is secured by means of a thermoset adhesive to a support member which is fabricated from graphite filament reinforced thermoset resin having a low coefficient of thermal expansion approaching zero. The unrestrained coefficient of thermal expansion of the printed wiring board is significantly greater than that of the support member. However, in the composite assembly, the apparent coefficient of thermal expansion of the printed wiring board is greatly reduced and can approximate the coefficient of thermal expansion of a ceramic chip carrier. The coefficient of thermal expansion of the printed wiring board in its thickness direction is only slightly reduced in the composite assembly.
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