Coordinate input apparatus

Details Coordinate input apparatus Coordinate input apparatus

1996-08-05

1998-11-03

Wu, Xiao

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

345174, G09G 500

Patent

active

058315993

ABSTRACT:
A coordinate input apparatus capable of preventing inaccurate detection of a position caused by chattering or a disturbed timing, thereby ensuring accurate detection of a position. Open check for determining whether the resistance of contact between a first resistive film and a second resistive film exceeds a preset value for a predetermined time is carried out before and after obtaining a signal of an X-coordinate position and also before and after obtaining a signal of a Y-coordinate position. In addition, there is provided a processing circuit, which detects the signals from tablet electrodes for multiple times within a predetermined time to obtain the position signals, converts them into digital values, calculates the difference between the values, and performs arithmetic processing and output only if the difference is a reference value or less.

REFERENCES:
patent: 4600807 (1986-07-01), Kable
patent: 4728945 (1988-03-01), Kojima
patent: 4737773 (1988-04-01), Kobayashi
patent: 4893115 (1990-01-01), Blanchard
patent: 4929934 (1990-05-01), Ueda et al.
patent: 5451724 (1995-09-01), Nakazawa et al.
patent: 5527163 (1996-06-01), Hashimoto

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