Teletext and display apparatus for general surface

Details Teletext and display apparatus for general surface Teletext and display apparatus for general surface

1981-02-17

1982-11-30

Robinson, Thomas A.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

043617255

ABSTRACT:
The apparatus comprises a wire sheet graphics tablet and a display apparatus, particularly a cathode ray tube, for receiving the signals transmitted by the graphics tablet. Alternating current flows through wires (5,6) of the tablet. The non-conducting plate (4) of the tablet is transparent and the wire sheets (5,6) are made up of transparent electrical conductors or of small conducting wires, which makes them practically invisible. The tablet is placed on the screen of the display apparatus. Between the screen of the cathode ray tube and the lower side of the graphics tablet, a transparent conducting and non-magnetic coating (8) is provided. In one variation, the current flowing through the layers of wire (5,6) is a high frequency current. The pen for the graphics tablet may be a metallic rod covered by a sheath of insulating material.

REFERENCES:
patent: 3671668 (1972-06-01), Reiffel
patent: 3758718 (1973-09-01), Fletcher et al.
patent: 4066855 (1978-01-01), Zenk
patent: 4220815 (1980-09-01), Gibson et al.
patent: 4225750 (1980-09-01), Rahuel et al.
IBM Technical Disclosure Bulletin, vol. 22, No. 8B, Jan. 1980, "Computer Interface Device", pp. 3542-3543.
Control Engineering, vol. 23, No. 7, Jul. 1976, "CRT Touch Panels Provide Maximum Flexibility in Computer Interaction", pp. 33-34.
IBM Technical Disclosure Bulletin, vol. 17, No. 3, Aug. 1974, "Position Transducing Tablet", pp. 748-749.

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