Device for graphic communication

A device for sending or receiving graphic information comprising:

• a. a plate of dielectric material on which writing paper may be affixed;
• b. a first stylus for writing graphic information, said stylus being made to radiate an RF signal;
• c. a movable electrode assembly located underneath said dielectric plate and arranged to sense said RF signal radiated by said first stylus;
• d. servo systems arranged to move said electrode assembly in the x and y-directions in response to signals received by said electrode assembly, and in such a way as to follow said first stylus;
• e. potentiometers connected to said servo systems via linkages and arranged to produce electrical signals corresponding to positions of said electrode assembly;
• f. a first set of two shafts connected to said servo systems via linkages and arranged to be accessible through slots cut on each side of said dielectric plate, said shafts being arranged to move along said slots when one of said servo systems is operated and said shafts being arranged to rotate about their axes when another of said servo systems is operated;
• g. a stylus holding assembly comprising a second stylus for reproducing graphic information, said assembly being removably attached to said first set of shafts so that when said first set of shafts rotates and/or moves along said slots said second stylus moves in the x and/or y-directions, said stylus holding assembly providing means for lowering and lifting said second stylus on and off said paper;
• h. means for converting said signals produced by said potentiometers into suitable form for transmission through telephone line and/or into binary data for feeding into a computer or into signals capable of being recorded on and retrieved from a magnetic tape;
• i. means for converting signals received from a computer, tape recorder, or from another similar device into signals suitable for operating said servo systems.