Electronic blackboard apparatus

Details Electronic blackboard apparatus Electronic blackboard apparatus

1987-01-09

1987-12-08

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

047119772

ABSTRACT:
An electronic blackboard apparatus comprises an electronic blackboard unit, a writing instrument, a position-detecting control unit, and an output section. When video information such as characters and figures is depicted on a writing surface by means of the writing instrument, a magnetic bias with a locus corresponding to the video information is simultaneously applied to a position-detecting tablet of the electronic blackboard unit. Position coordinates thereof are computed by the position-detecting control unit and converted into electric signals. Similarly, when the video information on the writing surface is erased by means of the eraser, a magnetic bias with a locus corresponding to the erased video informaton is simultaneously applied to the position-detecting tablet. Position coordinates thereof are calculated by the position-detecting control unit and converted into electric signals. On the basis of these electric signals, the video information on the writing surface is output from the output section as a hard-copy image or as a display image.

REFERENCES:
patent: 3761620 (1973-09-01), Graven
patent: 4634973 (1987-01-01), Murakami

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