24-01-2019 дата публикации
Номер: US20190029121A1
Принадлежит:
The proposed masking dam protects ball grid array integrated circuit components from conformal coating overflow, preventing joint breakage and thermal mismatch. The masking dam includes a frame with an integrated seal, a cover, and a fastening mechanism. The frame is sealed to a circuit board surround a component, the cover is attached to the frame, and the masking dam is secured to protect the component. 1. A masking dam comprising:a removable cover configured to protect a component; and a seal embedded in the frame, the seal configured to sealingly engage the removable cover and a circuit board;', 'a mounting feature configured to attach the frame to the circuit board; and', 'a securing feature configured to attach the frame to the removable cover., 'a frame comprising2. The masking dam of claim 1 , wherein the securing feature comprises a second seal between the frame and the removable cover.3. The masking dam of claim 1 , wherein the securing feature comprises a lip feature configured to lock the removable cover onto the frame.4. The masking dam of claim 1 , wherein the removable cover comprises a feature configured to hold the removable cover down on the frame and the circuit board.5. The masking dam of claim 1 , wherein the removable cover is made of a material selected from the group consisting of aluminum claim 1 , carbon fiber claim 1 , ceramic claim 1 , metal filament mixes claim 1 , fiberglass claim 1 , FR4 claim 1 , nylon 6-6 claim 1 , PBT polyester claim 1 , polyphenylene sulfide claim 1 , polyetherimide claim 1 , liquid-crystal polymers claim 1 , and combinations thereof.6. The masking dam of claim 1 , wherein the frame is made of a material selected from the group consisting of aluminum claim 1 , carbon fiber claim 1 , ceramic claim 1 , metal filament mixes claim 1 , nylon 6-6 claim 1 , PBT polyester claim 1 , polyphenylene sulfide claim 1 , polyetherimide claim 1 , liquid-crystal polymers claim 1 , and combinations thereof.7. The masking dam of claim ...
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