公开(公告)号：US4527021A

公开(公告)日：1985-07-02

申请号：US576872

申请日：1984-02-03

申请人： Yoshitsugu Morikawa ,  Kiyoshi Nomoto ,  Kenichi Okada

发明人： Yoshitsugu Morikawa ,  Kiyoshi Nomoto ,  Kenichi Okada

IPC分类号： H01H13/712 ,  G06F3/02 ,  H01H13/52 ,  H01H13/702 ,  H01H13/703 ,  H01H13/70

CPC分类号： H01H13/702 ,  H01H13/703 ,  H01H2203/02 ,  H01H2203/054 ,  H01H2209/002 ,  H01H2211/028 ,  H01H2213/002 ,  H01H2217/024

摘要： A key-board switching unit for electronic instruments is constructed with a printed circuit board provided with a plural number of pairs of fixed contact points on the surface and an insulating covering sheet member mounted on or above the printed circuit board and provided on the bottom surface with movable contact points to face the fixed contact points. Different from conventional units in which exact correspondence in the positions of the fixed and movable contact points is required with time- and labor-consuming assembling works, the movable contact points in multiple numbers distributed over the whole bottom surface of the covering sheet member in such a manner that, when the covering sheet member is pushed and depressed at the switching position, the fixed contact points forming a pair of the counter-electrodes are contacted and electrically connected with at least one movable contact point even without exact positioning of the covering sheet member and the printed circuit board to give a great advantage of the increased productivity in the works of assembling. In particular, the movable contact points are formed of a pressure-sensitive electroconductive rubber.

摘要翻译： 用于电子仪器的键盘切换单元由印刷电路板构成，印刷电路板在表面上设置多个固定接触点，绝缘覆盖片部件安装在印刷电路板上或上方，并设置在底面上 具有可动接触点以面对固定接触点。 与传统的单元不同，在传统的单元中，需要在固定和可移动的接触点的位置上精确的对应而且花费时间的组装工作，多个数量的可移动的接触点分布在覆盖片构件的整个底表面上 当覆盖片材在切换位置处被按压时，形成一对对电极的固定接触点即使没有精确定位的覆盖片也与至少一个可动接触点接触并电连接 成员和印刷电路板，大大提高了组装工作效率。 特别地，可动接触点由压敏导电橡胶形成。