Coordinate detecting apparatus

Details Coordinate detecting apparatus Coordinate detecting apparatus

1985-02-27

1987-07-14

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

340365S, G08C 2100

Patent

active

046804307

ABSTRACT:
A coordinate detecting apparatus for determining the coordinate data of a point on a plane by indicating the point with a touch of a fingertip or other load to the point. The apparatus comprises a transparent resistive film forming the plane (touch panel) and a buffer circuit operating as a voltage follower circuit having substantially infinate input impedance. The buffer amplifier is operatively connected between each selected pair of facing ends of a substantially rectangular region of the resistive film, and equalizes the potentials at the ends. The change of the impedance between one of the ends and the ground is detected in accordance with the touch of the fingertip to the touch panel and is used as an original coordinate data. Further modifications concerning the avoidance of degradation in the detection quality due to fluctuations of the impedance provided by the touch of a fingertip, for example, and the methods to perform 2-dimensional coordinate detection are described.

REFERENCES:
patent: 3449516 (1969-06-01), Cameron et al.
patent: 4103252 (1978-07-01), Bobick
patent: 4435616 (1984-03-01), Kley
patent: 4550310 (1985-10-01), Yamaguchi

Affiliated with

Also associated with

Rating

Coordinate detecting apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Coordinate detecting apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coordinate detecting apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1428895