Coordinate reading device

Details Coordinate reading device Coordinate reading device

1985-07-23

1987-06-02

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

330 1K, G08C 2100

Patent

active

046706275

ABSTRACT:
A coordinate reading device has a coordinate indicator which generates certain signals; a drive circuit which drives the coordinate indicator; plural sense-line electrodes which detect the signal generated from the coordinate indicator; an analogue circuit which amplifies and wave-forms the signal detected by the sense-line electrodes; an A/D converter which converts the analogue signal from the analogue circuit into digital signals; a scanning circuit which scans the sense-line electrodes; and a control circuit which sends the scanning address to the scanning circuit and which determines the position of the coordinate indicator in accordance with the signal from the A/D converter. A pair of resistance elements is provided at the amplification portion of the analogue circuit, and a switching element is connected to one of the resistance elements in series. The control circuit controls the switching element with the scanning address and changes the amplification factor of the analogue circuit.

REFERENCES:
patent: 4039747 (1977-08-01), Muller
patent: 4568799 (1986-02-01), Kobayashi et al.

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