Graphics table particularly for a telewriting system

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

1978-12-04

1980-09-30

Robinson, Thomas A.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

042257506

ABSTRACT:
A graphics table comprises 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 has a 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 time when the picked up signal passes through a peak. The invention is notably useful in a telewriting system.

REFERENCES:
patent: 3992579 (1976-11-01), Dymerae
patent: 3999012 (1976-12-01), Dym
patent: 4039747 (1977-08-01), Muller
patent: 4054746 (1977-10-01), Kamm
patent: 4080515 (1978-03-01), Anderson
patent: 4088842 (1978-05-01), Ikedo
patent: 4138592 (1979-02-01), Capehart et al.
"The Electronic Blackboard", Kegel, Tijdschrift van het Nederlands Elektronica, Jun. 1973, pp. 133-137.
"A Writing Tablet for Converting Current Handwriting into Electrical Signals", Nieuwkerk, Tijdschrift . . . Elektronica, Jun. 1973, pp. 139-143.
"The Display of an Electronic Blackboard System", Koudstaal, Tijdschrfit . . . Elektronica, Jun. 1973, pp. 145-155.
"Inductive Transducers for Graphical Input Devices", Ivaschenko et al., Sov. Jour. of Inst. & Cont., #8, Aug. 1969, pp. 22-25.

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