Telegraphy – Systems – Position coordinate determination for writing
Patent
1994-05-06
1996-03-05
Chin, Stephen
Telegraphy
Systems
Position coordinate determination for writing
345174, G08C 2100
Patent
active
054969743
ABSTRACT:
In an apparatus for detecting a coordinate position of a contact point in a touch panel, a resistance layer having a pair of electrodes opposed in a X direction and another resistance layer having a pair of electrodes opposed in a Y direction are opposed in a Z direction. The apparatus includes the following units. A unit for applying a voltage to the pair of electrodes of one resistance layer when the apparatus is in an input stand-by state. A resistance connecting an electrode of the other resistance layer to earth when the apparatus is in the input stand-by state. A unit for detecting a voltage induced to the other electrode of the other resistance layer when the resistance layers contact with each other in an event of a depressing operation. A unit for controlling the transition from the input stand-by state to another state in which an operation for detecting the coordination position is executed, when the voltage is induced to the other electrode of the other resistance layer.
REFERENCES:
patent: 4306110 (1981-12-01), Nelson et al.
patent: 5072076 (1991-12-01), Camp, Jr.
patent: 5245139 (1993-09-01), Protheroe et al.
Akebi Kazuhiko
Taki Kensuke
Chin Stephen
Gunze Limited
Loomis Paul
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