公开(公告)号：WO1982001100A1

公开(公告)日：1982-04-01

申请号：PCT/US1981001214

申请日：1981-09-09

Applicant: NCR CORP

Inventor： NCR CORP ,  SEARS R ,  GROSS J

IPC: H01H13/70

CPC classification number: H01H13/80 ,  H01H13/702 ,  H01H2201/008 ,  H01H2209/014 ,  H01H2215/002 ,  H01H2215/008 ,  H01H2217/02 ,  H01H2221/042 ,  H01H2227/002 ,  H01H2229/018 ,  H01H2229/042

Abstract: A keyboard includes a resilient foam layer (28) having an array of holes (30) therein with the layer (28) being sandwiched between a flexible sheet having dome-shaped areas (34) aligned with said holes and a dielectric member (38), the flexible sheet and dielectric member having electrodes (36, 40) thereon which are arranged to complete a circuit associated with a hole (30) when the flexible sheet and member are moved toward each other. A snap action of the dome-shaped areas (34) in the switch movement provides for improved tactile response and switch travel and reduced switch actuating force. Additional foam layers enhance the operating characteristics of the embodiments. A method of production of the keyboard entails determining the operating parameters of a desired keyboard and selecting the relative density and thicknesses of various resilient layers and flexible sheets in the keyboard to determine the switch actuating force, the extent of travel of the switch, and the location of the "makepoint" of the switch at a position between the start and end of switch travel.

Abstract translation: 键盘包括弹性泡沫层（28），弹性泡沫层（28）具有孔阵列（30），其中所述层（28）被夹在具有与所述孔对准的圆顶形区域（34）的柔性片材和电介质构件（38）之间， 所述柔性片和电介质构件具有电极（36,40），当所述柔性片和构件彼此相对移动时，所述柔性片和电介质构件布置成完成与孔（30）相关联的电路。 开关运动中圆顶形区域（34）的快速动作提供了改善的触觉响应和开关行程以及降低的开关致动力。 附加的泡沫层增强了实施例的操作特性。 制作键盘的方法需要确定期望的键盘的操作参数，并且选择键盘中的各种弹性层和柔性片材的相对密度和厚度以确定开关致动力，开关的行程范围和 开关的“makepoint”位于开关行程开始和结束之间的位置。