Telautograph system
First Claim
1. A terminal comprising(a) first large area conductive means provided with at least three spaced apart localized electrode connections thereto,(b) means under control of recording information for injecting current into a point in the first conductive means for flow in the first conductive means and for dividing among said at least three electrodes and supplying a separate portion of the current to each of said at least three electrodes, and(c) signal processing means, supplied with the separate current portions from at least the three electrodes, for processing the at least three current portions and deriving a pair of signals representative of the coordinates of the injection point.
1 Assignment
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Accused Products
Abstract
The position (XY coordinate) of a pointed stylus on a conductive sheet is determined by injecting current from the stylus into the sheet and measuring the current responses at three or more spaced apart electrodes connected to the sheet.
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Citations
8 Claims
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1. A terminal comprising
(a) first large area conductive means provided with at least three spaced apart localized electrode connections thereto, (b) means under control of recording information for injecting current into a point in the first conductive means for flow in the first conductive means and for dividing among said at least three electrodes and supplying a separate portion of the current to each of said at least three electrodes, and (c) signal processing means, supplied with the separate current portions from at least the three electrodes, for processing the at least three current portions and deriving a pair of signals representative of the coordinates of the injection point.
Specification