Position input apparatus encluding a position detector input app

Details Position input apparatus encluding a position detector input app Position input apparatus encluding a position detector input app

1988-12-20

1991-01-29

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

338 99, 178 18, G03G 1500

Patent

active

049890409

ABSTRACT:
A position detector outputs an electrical signal of a level corresponding to a pressed position. The detector has at least three reference points, each reference region begin set therebetween. When the position detector is pressed, the region to which the pressed position belongs is discriminated, and the pressed position is operated relative to the two reference points defining the region, on the basis of the previously stored outputs from the reference points and the output from the pressed position. The position detector has a strip of upper and lower electrode both with wiring members and a grounded conductor provided under the lower electrode. The upper and lower electrodes and the wiring members for the electrodes are disposed so that they are positioned inwardly of the periphery of the conductor at least by the distance equal to that from the upper surface of the upper electrode to the upper surface of the conductor. The electromagnetic effects to the apparatus are absorbed in the grounded conductor, protecting the electrodes and wiring members from noise. On the upper surface of the upper electrode is attached are a plurality of touch protrusions.

REFERENCES:
patent: 3974332 (1976-08-01), Abe et al.
patent: 4570149 (1986-02-01), Thornburg et al.
patent: 4679927 (1987-07-01), Sogo et al.

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