Browse Prior Art Database

Position Transducing Tablet

IP.com Disclosure Number: IPCOM000081802D
Original Publication Date: 1974-Aug-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Warwick, WA: AUTHOR

Abstract

Electronic position transducing tablets employing a tablet-stylus arrangement are well known. A typical arrangement is described in United States Patent 3,593,115.

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Position Transducing Tablet

Electronic position transducing tablets employing a tablet-stylus arrangement are well known. A typical arrangement is described in United States Patent 3,593,115.

Fig. 1, which shows four sheets in plan view, and Fig. 2, which shows an expanded sectional view, illustrate a convenient construction for a tablet structure. Top sheet A of glass has X conductors 1 of conductive epoxy or other similar material, screen or offset lithoprinted on its lower surface. X conductors 1 are connected to capacitive coupling plates 2 and 3 also printed on sheet 1. Beneath sheet 1 is located sheet B of plastics material, for example MYLAR* polyester film, 0.0003 to 0.0005 inch thick, serving to insulate conductors 1 and also serving as a capacitor dielectric.

Beneath sheet B is located copper-clad sheet C also of plastics material, for example copper-clad MYLAR polyester film of 0.0003 to 0.0005 inch thickness. Etched in the copper foil are X-driver capacitor plates 7 in register with plates 2 on sheet A, Y-driver capacitor plates 8, capacitor plates 9 in registry with plates 3 on sheet A, capacitor plates 10, and conductors 11 which lead from various ones of plates 7 to 10 to input/output connection area 12.

At the bottom of the stack is sheet D of glass or other insulating material carrying Y conductors 4 terminated in capacitor plates 5 and 6 in register with plates 8 and 10, respectively, on sheet C. Conductors 4 and capacitor plates 5 and 6 are for...