公开(公告)号：US5861583A

公开(公告)日：1999-01-19

申请号：US680127

申请日：1996-07-15

申请人： Richard R. Schediwy ,  Jeffrey O. Pritchard ,  Ting Kao ,  Timothy P. Allen ,  John C. Platt

发明人： Richard R. Schediwy ,  Jeffrey O. Pritchard ,  Ting Kao ,  Timothy P. Allen ,  John C. Platt

IPC分类号： G06F3/033 ,  G06F3/041 ,  G06F3/044 ,  G06F3/048 ,  G06K9/00 ,  G08C21/00 ,  G09G5/00

CPC分类号： G06F3/044 ,  G06F3/041 ,  G06K9/00335 ,  G06F2203/04101 ,  G06F2203/04808

摘要： An object proximity sensor includes a capacitive touch-sensitive transducer including row conductive lines insulated from column conductive lines to from a matrix. An insulating layer is disposed over the matrix and has a thickness selected to achieve significant capacitive coupling between an object placed on its surface and the matrix. Circuitry first drives each of the row conductive lines to a fixed voltage and then simultaneously injects a known amount of charge onto each of the row conductive lines, and then senses for each row conductive line a row-sense voltage created by the known amount of charge injected onto each of the row conductive lines, and, simultaneous with injected the known amount of charge, changes the voltage on all of the column conductive lines in the same direction as the row-sense voltage by an amount no greater than about twice the difference between the fixed voltage and an average of all row-sense voltage in the transducer. Circuitry first drives each of the column conductive lines to a fixed voltage and then simultaneously injects a known amount of charge onto each of the column conductive lines, and then senses for each column conductive line a column-sense voltage created by the known amount of charge injected onto each of the column conductive lines, and, simultaneous with injecting the known amount of charge, changes the voltage on all of the row conductive lines in the same direction as the column-sense voltages by an amount no greater than about twice the difference between the fixed voltage and an average of all column-sense voltages in the transducer. A set of object-sensed electrical signals related to all of the row-sense voltages and all of the column-sense voltages is produced.

摘要翻译： 物体接近传感器包括电容式触敏传感器，其包括从列导电线与矩阵绝缘的行导线。 绝缘层设置在矩阵之上，并且具有选择的厚度，以在放置在其表面上的物体与矩阵之间实现显着的电容耦合。 电路首先将每行行导线驱动到固定电压，然后同时将已知数量的电荷注入到每行行导线上，然后感测每行行导线由已知电荷量产生的行感应电压 注入到每行行导线上，同时注入已知的电荷量，将所有列导电线上的电压与行检测电压沿相同的方向改变不大于两倍的差值 在固定电压和传感器中的所有行感应电压的平均值之间。 电路首先将每个列导电线驱动到固定电压，然后同时将已知量的电荷注入到每个列导电线上，然后感测每个列导电线由已知电荷量产生的列检测电压 注入到每个列导电线上，并且同时注入已知的电荷量，将所有行导电线上的电压与列检测电压沿相同的方向改变不大于两倍的差值 在固定电压和传感器中所有列检测电压的平均值之间。 产生与所有行检测电压和所有列检测电压相关的一组物体感测电信号。