Graphics table particularly for a telewriting system

Details Graphics table particularly for a telewriting system Graphics table particularly for a telewriting system

G - Physics

06

K

340/135.1

G06K 11/02 (2006.01) G06F 3/033 (2006.01)

Patent

CA 1101961

Graphics Table Particularly For A Telewritinq System Abstract of the Disclosure A graphic table comprising a non-conductive plate supporting two crossing layers of wires and a pen for writing on a sheet disposed on the plate. The wires are successively scanned by an electric current which creates a field to be detected by the pen. The electric current is a current of high frequency, for example of the order of ten megahertz, and the wires are switched at a frequency of for example one hundred kilohertz. The pen is followed by a selective amplifier of ten megahertz, by a filter, by a detector, and by a circuit for determining the instant when the picked up signal passes through a peak. Notably useful in telewriting systems.

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