发明授权
- 专利标题: Two step SMT method using masked cure
- 专利标题(中): 两步SMT方法使用掩蔽固化
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申请号: US175916申请日: 1998-10-20
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公开(公告)号: US6139661A公开(公告)日: 2000-10-31
- 发明人: John E. Cronin , Joseph D. Poole , Michael C. Weller
- 申请人: John E. Cronin , Joseph D. Poole , Michael C. Weller
- 申请人地址: NY Armonk
- 专利权人: International Business Machines Corporation
- 当前专利权人: International Business Machines Corporation
- 当前专利权人地址: NY Armonk
- 主分类号: C09J5/00
- IPC分类号: C09J5/00 ; H05K3/32 ; B32B31/28
摘要:
A method for temporarily attaching an electrical component to a pad, testing the component, removing and replacing the component if necessary, and making a final attachment of the component to the pad. The method provides for attachment and removal of components, to and from pads located on the substrate of a printed circuit board, wherein the method enables components to be easily removed prior to final assembly without damaging the circuit board or components mounted thereon. The method utilizes a layer of conductive, radiation-curable adhesive placed between the component's lead and the pad. Radiation is then directed through a mask onto a portion of the adhesive layer, which cures the portion while leaving a remaining area of the adhesive layer uncured. Because the portion of the adhesive layer that receives the radiation, and is consequently cured by the radiation, is only a limited portion of the whole adhesive layer, the component may be easily removed from the pad by applying a small mechanical force. Following such removal, the component or a replacement thereof may be attached to the remaining area. The final stage of the method cures the remaining area of uncured adhesive by exposing the remaining area to radiation.