| 摘要 |
<p>A coordinate sensing device uses electric currents to energise a conducting member (16) which has a major surface (18) and preferably is made of a mesh material. Electrical currents are sequentially applied to create alternate non-coincident electrical fields so that when a probe (22) is applied to the surface, the obtained electrical potentials can be compared to a reference potential. The resulting potential differences may then be conveniently converted to appropriate signals. The conducting member is not limited as to shape or construction; hence, it may also act as an anti-glare device for a cathode-ray tube. The fields created by the electrical currents need not be uniform. This device permits the user to communicate with a computer by means of a display device.</p> |
