Extended Tab Mechanical Seal for Mcm Module
Original Publication Date: 1987-Jan-01
Included in the Prior Art Database: 2005-Jan-31
This article describes a clamping device for a thermally efficient cap and substrate assembly. The device will maintain a good seal over significant environmental ranges of temperature, humidity, etc. The extended tab mechanical seal is useful when the cap material and the substrate material present a thermal mismatch in the final module assembly which precludes the use of a bonded seal. The extended tab configuration acts like an adjustable "C" clamp to develop a tight mechanical joint between cap and substrate. The dimensions are chosen so as to present the least amount of stress to the cap and substrate assembly, which could cause warping of the cap. Dimensions "A" and "B" in Fig. 1 should be as large as possible but not to exceed approximately 50% of the total cap dimension.