发明授权
- 专利标题: Spring structure with stress-balancing layer
- 专利标题(中): 弹簧结构应力平衡层
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申请号: US09976394申请日: 2001-10-12
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公开(公告)号: US06794737B2公开(公告)日: 2004-09-21
- 发明人: Linda T. Romano , David K. Fork
- 申请人: Linda T. Romano , David K. Fork
- 主分类号: H01L2150
- IPC分类号: H01L2150
摘要:
A stress-balancing layer formed over portions of a spring metal finger that remain attached to an underlying substrate to counter internal stresses inherently formed in the spring metal finger. The (e.g., positive) internal stress of the spring metal causes the claw (tip) of the spring metal finger to bend away from the substrate when an underlying release material is removed. The stress-balancing pad is formed on an anchor portion of the spring metal finger, and includes an opposite (e.g., negative) internal stress that counters the positive stress of the spring metal finger. A stress-balancing layer is either initially formed over the entire spring metal finger and then partially removed (etched) from the claw portion, or selectively deposited only on the anchor portion of the spring metal finger. An interposing etch stop layer is used when the same material composition is used to form both the spring metal and stress-balancing layers.
公开/授权文献
- US20030071330A1 Spring structure with strees-balancing layer 公开/授权日:2003-04-17
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