Browse Prior Art Database

Extended Tab Mechanical Seal for Mcm Module

IP.com Disclosure Number: IPCOM000038531D
Original Publication Date: 1987-Jan-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

Courtney, MG: AUTHOR [+2]

Abstract

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.

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Extended Tab Mechanical Seal for Mcm Module

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. Dimensions "E" and "F" are critical in maintaining the proper strength in the "C" clamp assembly. "C" and "D" dimensions are nominal values chosen for the specific application. The locator can be sized to pick up a corner of the substrate for locating purposes or the substrate can be notched, as shown in Fig. 2, to prevent the extended tab mechanical seal from being off location. In the final application, two of these devices are required per module, and on opposite sides of the substrate. The design of the

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mechanical seal is such that it can be removed and re-used, if desired. It is dimensioned such that the finished product wil...