公开(公告)号：US5790106A

公开(公告)日：1998-08-04

申请号：US557507

申请日：1995-11-14

申请人： Shinji Hirano ,  Mikio Matsumoto ,  Shinichi Higuchi ,  Kinya Inoue ,  Yoshihisa Endo ,  Tadashi Manome

发明人： Shinji Hirano ,  Mikio Matsumoto ,  Shinichi Higuchi ,  Kinya Inoue ,  Yoshihisa Endo ,  Tadashi Manome

IPC分类号： G06F3/033 ,  G06F3/041 ,  G09G3/02 ,  G08C21/00

CPC分类号： G06F3/041 ,  G06F3/03545 ,  G06F3/044

摘要： A coordinate input apparatus which performs an input operation with high precision by use of either an operator's finger or an input pen. The input apparatus includes a tablet having a plurality of X electrodes and Y electrodes arranged in the form of a matrix on the respective top and bottom surfaces of a glass substrate. The input apparatus also has a first oscillation circuit connected to the X electrodes through an analog switch. It is further provided with an input pen containing a second oscillation circuit. When the pen is used to perform the input operation through use of coordinates, the following method of determining the coordinates designated by the pen is employed. A voltage oscillating from the pen is applied to each electrode through capacitance, and the resulting output voltage varies depending on the distance from each electrode to the pen. Based on the varied output voltages, a predetermined computation process is executed to determine the coordinates designated by the pen. On the other hand, when the operator's finger is used to perform the input operation, the analog switch is switched to the first oscillation circuit. Then, a voltage at a predetermined frequency is sequentially applied to each of the X electrodes from the first oscillation circuit, and the voltage applied across the X and Y electrodes is changed due to a decrease in the capacitance therebetween caused by the touching of the finger. Based on this change, coordinates designated by the finger is detected.

摘要翻译： 一种坐标输入装置，其通过使用操作者的手指或输入笔执行高精度的输入操作。 输入装置包括具有在玻璃基板的相应顶表面和底表面上以矩阵形式布置的多个X电极和Y电极的片剂。 输入装置还具有通过模拟开关连接到X电极的第一振荡电路。 还设置有包含第二振荡电路的输入笔。 当使用笔用于通过使用坐标来执行输入操作时，采用以下确定由笔指定的坐标的方法。 从笔上振荡的电压通过电容施加到每个电极，并且所得到的输出电压根据从每个电极到笔的距离而变化。 基于不同的输出电压，执行预定的计算处理以确定由笔指定的坐标。 另一方面，当操作者的手指用于执行输入操作时，模拟开关切换到第一振荡电路。 然后，从第一振荡电路向X电极中的每一个依次施加预定频率的电压，并且由于手指的触摸引起的电容的减小，X和Y电极两端的电压发生变化 。 基于该变化，检测由手指指定的坐标。