Stylus-input computing system with erasure

Details Stylus-input computing system with erasure Stylus-input computing system with erasure

1995-05-03

1997-08-05

Kuntz, Curtis

Telegraphy

Systems

Position coordinate determination for writing

178 19, 345179, G08C 2100, G09G 302

Patent

active

056545290

ABSTRACT:
A handheld computing device has a planar display and a superimposed, transparent digitizer. The combination is arranged to simulate writing or drawing with pencil on paper: the writing end of a passive stylus is pressed on and moved across the digitizer surface and a line on the display is produced directly under the stylus path. In order to complete the analogy to pencil and paper, display erasure is also provided. Under the display is located an inductive winding. The other end of the stylus contains a small permanent magnet. When the magnet end of the stylus is pressed against the digitizer and moved over a display line, a small voltage is induced in the inductive winding. This voltage is converted into a logic signal. The assertion of this signal together with a signal from the digitizer results in the erasure of display traces in the region inferred from the digitizer signal.

REFERENCES:
patent: 4646107 (1987-02-01), Shimizu
patent: 4670751 (1987-06-01), Enokido
patent: 4697050 (1987-09-01), Farel et al.
patent: 4711977 (1987-12-01), Miyamon
patent: 5134388 (1992-07-01), Murakami
patent: 5231578 (1993-07-01), Levin et al.
patent: 5401916 (1995-03-01), Crooks

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