| 主权项 |
1. A wireless input device without internal power supply comprising:
a plurality of RFID tag units, each said RFID tag unit being coupled with at least two conductive wires respectively; wherein, only when said at least two conductive wires are in a closed-loop status, said RFID tag unit is capable of generating a responsive RF signal corresponding to a scanning signal generated by an external host device; wherein, the responsive RF signal generated by each said RFID tag unit is unique and is different from other responsive RF signals generated by other RFID tag units; and a plurality of keys, each said key being formed with a switching mechanism connectable to said conductive wires of at least one of said RFID tag units; wherein, when any one of the keys is pressed, the conductive wires connectable to said pressed key will be switched to said closed-loop status from an open-loop status, and when that pressed key is released, the conductive wires connectable to said released key will be switched back to said open-loop status; wherein the keys are substantially arranged in a form of an array having “n” columns and “m” rows, such that said keys can be named according to their positions in the array as KEY(1,1), KEY(1,2), KEY(1,3), . . . KEY(1,n), KEY(2,1), KEY(2,2), KEY(2,3), . . . K(m,n), respectively; wherein both m and n are integral; wherein the RFID tag units comprises “n” number of column-tags which can be named as TAG(X1), TAG(X2), TAG(X3), . . . TAG(Xn) respectively and “m” number of row-tags which can be named as TAG(Y1), TAG(Y2), TAG(Y3), . . . , TAG(Ym) respectively; wherein, the two conductive wires of each one of said column-tags are connectable to all of the keys belong to the same column, that is, the two conductive wires of TAG(X1) are connectable to the KEY(1,1), KEY(2,1), KEY(3,1), . . . and KEY(m,1); wherein, the two conductive wires of each one of said row-tags are connectable to all of the keys belong to the same row, that is, the two conductive wires of TAG(Y1) is connectable to the KEY(1,1), KEY(1,2), KEY(1,3), . . . and KEY(1,n); wherein when one of said keys is pressed, the conductive wires of at least two different RFID tag units will be switched to said closed-loop status; that is, when any one of said keys is pressed, the switching mechanism of said pressed key becomes a closed-loop between the set of conductive wires of the column-tag which is belong to the same column as the pressed key, in addition, the switching mechanism of said pressed key also becomes a closed-loop between the set of conductive wires of the row-tag which is belong to the same row as the pressed key. |
