Transparent coordinate input apparatus for electrostatic capacit

Details Transparent coordinate input apparatus for electrostatic capacit Transparent coordinate input apparatus for electrostatic capacit

1990-04-16

1992-01-21

Brier, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

178 18, G09G 302

Patent

active

050831186

ABSTRACT:
A transparent coordinate input apparatus for an electrostatic capacity coupling system mounted on a CRT tube surface, an LCD display surface or the like to effect input. The transparent coordinate input apparatus comprises a tablet composed of a plurality of electrode wires arranged close to the display surface of the inptu device such as CRT, LCD, etc. and arranged in an axial direction of the axis of coordinate; a control section for sequentially applying pulse signals to the electrode wires of said tablet; a coordinate indication means electrostatic-capacity coupled to the pulse applied to each of the electrode wires of said tablet to effect signal detection; a calculation section for calculating a positional coordinate from the signal detected by said coordinate indication means, and a noise preventive means for relieving a noise from the display surface of the input device such as CRT, LCD, etc., said noise preventive means having one end of each of the electrode wires of said tablet terminated at a resistor having hundreds of ohms, a pattern of each of the electrode wires of a layer close to the tube surface of CRT being increased and the gap between the electrode wires being narrowed whereby the electrode wire not applied with pulse signals functions as a shield layer.

REFERENCES:
patent: 3974332 (1976-08-01), Abe et al.
patent: 4477877 (1984-10-01), Nakamura et al.
patent: 4492819 (1985-01-01), Rodgers et al.
patent: 4571454 (1986-02-01), Tamaru et al.
patent: 4947156 (1990-08-01), Sato et al.

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