发明授权
- 专利标题： Keyboard membrane switch having threshold force structure
- 专利标题（中）： 键盘薄膜开关具有临界力结构
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申请号： US613254申请日： 1975-09-15
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公开(公告)号： US4017697A公开(公告)日： 1977-04-12
- 发明人: Willis August Larson
- 申请人： Willis August Larson
- 申请人地址： WI Milwaukee
- 专利权人： Globe-Union Inc.
- 当前专利权人： Globe-Union Inc.
- 当前专利权人地址： WI Milwaukee
- 主分类号： G06F3/02
- IPC分类号： G06F3/02 ; H01H13/702 ; H01H13/703 ; H01H13/712 ; H01H35/00 ; H01H13/52 ; H01H1/50
摘要：
A keyboard membrane switch including the standard three layer resilient flexible diaphragm switch construction. Threshold pressure is applied to the membrane prior to engagement of the membrane contact with at least one fixed contact. This phenomenon is achieved by applying variable thicknesses of nonconductive threshold paint or glass to the substrate, flexible membrane, a first layer of threshold material or any combination thereof.
公开/授权文献
- US5668668A Zoom lens with five lens groups 公开/授权日：1997-09-16