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SYSTEM FOR CONVERTING GRAPHIC INFORMATION APPLIED WITH A WRITER ON A WRITING PLATE TO ELECTRICAL SIGNALS DETERMINING THE LOCATION OF THE WRITER.
SYSTEM FOR CONVERTING GRAPHIC INFORMATION APPLIED WITH A WRITER ON A WRITING PLATE TO ELECTRICAL SIGNALS DETERMINING THE LOCATION OF THE WRITER.
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机译:用于将应用于书写板上的书写器的图形信息转换为用于确定书写器位置的电信号的系统。
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摘要
A two-dimensional graphic data entry tablet for transforming a positional information into a digital input to a computer system. The tablet structure consists of two continuous resistance lines superimposed on each other. Each of these lines being in the form of a grid and representing position in one of said two dimensions. A voltage differential is applied to each of the grids in order to create a voltage gradient along the path of the grid wires. An analog positional information is created by sensing grid voltage with a capacitively coupled stylus. By having the stylus viewing area cover a plurality of wires, the sensed potential averages out and represents a position directly related to the center location of the stylus on the faceplate of the tablet. The resistive grid lines provide the dual function of resistive bleeding and presenting a potential gradient to a capacitively coupled stylus.
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