公开(公告)号：US3720938A

公开(公告)日：1973-03-13

申请号：US3720938D

申请日：1971-04-19

申请人： LEMATEX INC

发明人： LEPOSAVIC W

IPC分类号： B41J5/12 ,  G06F11/08 ,  H01H13/70 ,  H01H13/702 ,  H01H13/703 ,  H01H13/785 ,  H03M11/22 ,  H04Q3/00

CPC分类号： H01H13/785 ,  B41J5/08 ,  B41J5/12 ,  G06F11/085 ,  H01H13/70 ,  H01H13/702 ,  H01H13/703 ,  H01H2201/03 ,  H01H2205/032 ,  H01H2207/012 ,  H01H2209/006 ,  H01H2209/01 ,  H01H2211/016 ,  H01H2217/016 ,  H01H2225/018 ,  H01H2239/026 ,  H03M11/22

摘要： In a mechanically operated keyboard employing keys each having a multiplicity of electrical switch contacts for providing an encoded electrical signal output corresponding to and uniquely identifying individual key stations, an electrical circuit provides a dummy load across the multiple switch contacts which varies as different keys are actuated in a manner to provide a constant load across the multiple switch contacts. The electrical circuit develops a control signal which can be employed in conjunction with associated circuits to inhibit erroneous data output signals from the keyboard in the event of improper switch closure.

摘要翻译： 在机械操作的键盘中，每个键具有多个电开关触点，用于提供对应于和唯一地识别各个关键站的编码电信号输出，电路在多个开关触点上提供虚拟负载，随着不同键被致动而变化 以便在多个开关触点之间提供恒定负载。 电路产生一个控制信号，该控制信号可以与相关的电路一起使用，以防止在关闭不正确的情况下来自键盘的错误的数据输出信号。

公开(公告)号：US3742157A

公开(公告)日：1973-06-26

申请号：US3742157D

申请日：1971-04-16

申请人： LEMATEX INC

发明人： LEPOSAVIC W

IPC分类号： B41J5/12 ,  H01H13/702 ,  H01H13/703 ,  H01H13/785 ,  H01H13/80 ,  H01H9/26

CPC分类号： H01H13/785 ,  B41J5/12 ,  H01H13/702 ,  H01H13/703 ,  H01H13/80 ,  H01H2201/004 ,  H01H2201/014 ,  H01H2201/026 ,  H01H2203/018 ,  H01H2203/022 ,  H01H2205/032 ,  H01H2207/022 ,  H01H2209/01 ,  H01H2211/03 ,  H01H2217/024 ,  H01H2221/05 ,  H01H2223/002 ,  H01H2229/008 ,  H01H2229/016 ,  H01H2229/028

摘要： A multiple switch construction for a keyboard or the like produced as a flat panel embodying laminates of electrical conductors in desired patterns, assembled as stratifications in close proximity and separated by spacers. Individual depressible means operating through resilient members urge movable switch elements into contact with fixed electrical conductors with a rotary, wiping action to insure positive electrical contact.