Wireless pen tablet

Telegraphy – Systems – Position coordinate determination for writing

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375239, G08C 2100

Patent

active

055042791

ABSTRACT:
A wireless communication apparatus sends X and Y coordinate position signals of a pen on a tablet using position modulation of three pulses, the time separation between the first and second pulses being proportional to the X position and the time spacing between the second and third pulses being proportional to the Y position. At a receiver, the three-pulse wireless signal is received and the X and Y coordinate information is determined therefrom.

REFERENCES:
patent: 3670103 (1972-06-01), Baxter et al.
patent: 4886911 (1989-12-01), Davis et al.
patent: 5113041 (1992-05-01), Blonder et al.
patent: 5138118 (1992-08-01), Russell
patent: 5908351 (1995-04-01), Hucng

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