Cursor device for a capacitive coupling tablet

Details Cursor device for a capacitive coupling tablet Cursor device for a capacitive coupling tablet

1987-09-24

1991-08-20

Oberley, Alvin E.

Communications: electrical

Land vehicle alarms or indicators

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

178 18, G09G 508

Patent

active

050418203

ABSTRACT:
A cursor device for a capacitive coupling tablet used as a digitizer for inputting a figure or pattern. An index indicative of a coordinate position on a tablet to be input is displayed on a pane mounted on a window of a housing, and on the side opposite the pane are carried a detection electrode corresponding to the index and a signal transmission wire extending from the electrode. The detection electrode is capacitively coupled to a few conductors adjacent to each other within the table to detect pulses having a level related to the distance from these conductors. In this case, the level of the pulse detected from the conductors present at a position crossed to the signal transmission wire tends to relatively lower, and therefore, a shield layer distributed around the electrode is formed on the pane to solve such inconveniences.

REFERENCES:
patent: 4194084 (1980-03-01), Hetzel
patent: 4523654 (1985-06-01), Quayle et al.
patent: 4600807 (1986-07-01), Kable
patent: 4639547 (1987-01-01), Jacob-Grinschgl et al.
patent: 4705919 (1987-11-01), Dhawan

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