Coordinate position digitizing system

• US 4,571,454 A
• Filed: 11/04/1983
• Issued: 02/18/1986
• Est. Priority Date: 11/11/1982
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Yoshida, Kimiyoshi, Kitamura, Nobuo, Tamaru, Hideshi, Sakano, Akio, Shikakura, Kunio
• Primary Examiner(s): SCHREYER, STAFFORD
• Application Number:
  US06/548,766
• Time in Patent Office: 837 Days
• Field of Search: 178/18, 178/19, 178/20, 340/206
• US Class Current: 178/18.06
• CPC Class Codes: G01B 7/004 for measuring coordinates of points
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

A coordinate position digitizing system comprises a position determining plate having a plurality of first parallel strip electrodes provided on one surface of a insulating layer to form plural groups thereof each connected in common and a plurality of second parallel electrodes each having the width wider than that of each of the first electrodes and provided on the other surface of the insulating layer to extend in the direction perpendicular to the first electrodes, a detecting electrode provided to face to the surface of the insulating layer on which the first electrodes are provided and connected through a predetermined capacitance to a reference potential point for producing a signal in response to a voltage obtained thereat, driving and controlling means for supplying with a constant voltage selectively to the groups of the first electrodes one after another during a first period and also supplying with the constant voltage selectively to the second electrodes one after another during a second period, and means for producing positional data defining positions of the detecting electrode on the position determining plate in both the direction of arrangement of the first electrodes and the direction of arrangement of the second electrodes in response to the signal derived from the detecting electrode.

Claims

1. A coordinate position digitizing system comprising:

a position determining plate having a plurality of first strip electrodes provided on one surface of an insulating layer to extend parallel to one another in one direction at regularly spaced intervals and form plural groups thereof disposed successively, each of said groups having a successive fraction of the plurality of first electrodes connected in common, and a plurality of second strip electrodes provided on another surface of the insulating layer to extend parallel to one another at regularly spaced intervals in a second direction perpendicular to said first electrodes;

detecting electrode means provided to face to said one surface of the insulating layer and connected through a predetermined capacitance to a reference potential point for producing a signal in response to a voltage obtained thereat,

driving and controlling means for supplying a constant voltage selectively to said groups of the first electrodes one after another during a first period and also supplying the constant voltage selectively to said second electrodes one after another during a second period, and

means for producing positional data defining positions of said detecting electrode means on said position determining plate in both the one direction of said first electrodes and the second of said second electrodes in response to the signal derived from said detecting electrode means.

2. A coordinate position digitizing system according to claim 1, wherein each of said second electrodes is formed to have a width wider than that of each of said first electrodes.

3. A coordinate position digitizing system according to claim 2, wherein each of first electrodes is arranged with such a width as not to have shielding effect to said second electrodes in respect of said detecting electrode means.