Pen input device

Details Pen input device Pen input device

1993-09-20

1995-08-22

Chin, Stephen

Telegraphy

Systems

Position coordinate determination for writing

345166, G08C 2100, G09G 302

Patent

active

054441935

ABSTRACT:
A pen input device is provided with a tablet having a top surface and a plurality of reference lines provided at a constant pitch on the top surface in mutually perpendicular directions, and a pointing device having a tip end, a first device for irradiating light on the tablet via the tip end, and a second device for detecting a moving direction and a moving quantity of the tip end of the pointing device on the tablet and a distance between the tip end of the pointing device and the top surface of the tablet based on scattered light received from the tablet.

REFERENCES:
patent: 4546347 (1985-10-01), Kirsch
patent: 4764885 (1988-08-01), Greanias et al.
patent: 4794634 (1988-12-01), Torihata et al.
patent: 4977315 (1990-12-01), Durcell
patent: 5086197 (1992-02-01), Liou

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