Coordinate detecting device

Details Coordinate detecting device Coordinate detecting device

1994-05-09

1996-06-25

Chin, Stephen

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

055302106

ABSTRACT:
There is disclosed a position detecting apparatus capable of operating with a high electric power efficiency, which can be configured only with digital circuits without analog switches. The position detecting apparatus includes a plurality of loop coils (2-1, 2-2, 2-3), and a plurality of three-state drivers (5-1, 5-2, 5-3) wherein one end of each loop coil is connected to corresponding one of three-state drivers. The other ends of the plurality of loop coils (2-1, 2-2, 2-3) are connected in common to a three-state driver (6). One of three-state drivers (5-1, 5-2, 5-3) is selected and connected to a NOR gate (4), while the other three-state drivers are maintained in a high impedance state, and the three-state driver (6) is grounded, whereby a signal generated by an oscillator (3) is applied to the selected loop coil so as to generate a radio wave. On the other hand, when the three-state driver (6) is in a high impedance state, it is possible to detect a voltage induced by a radio wave reflected from a position indicator (1).

REFERENCES:
patent: 4700022 (1987-10-01), Salvador et al.
patent: 4837716 (1989-06-01), Chia-Hua
patent: 4878553 (1989-11-01), Yamanami et al.
patent: 4999461 (1991-03-01), Murakami et al.

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