Telegraphy – Systems – Position coordinate determination for writing
Patent
1993-01-21
1996-12-24
Chin, Wellington
Telegraphy
Systems
Position coordinate determination for writing
178 19, 178 20, 345156, 345157, 345173, 345174, 345175, 345179, 345180, G08C 2100, G09G 302
Patent
active
055875580
ABSTRACT:
A coordinate input device includes a coordinate detector which may include an acceleration detector for accurate determination of the spatial coordinates of a coordinate indicator. A three-dimensional acceleration in a first coordinate system is detected by a first acceleration detecting unit and is converted into an input coordinate system in accordance with the attitude of the coordinate indicator. The effect of gravity is removed and the acceleration is integrated to obtain the spatial coordinates of the coordinate indicator. Even if the coordinate indicator is tilted, accurate coordinate input can be performed.
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patent: 5247137 (1993-09-01), Epperson
patent: 5248855 (1993-09-01), Cambridge
Chin Wellington
Seiko Instruments Inc.
Shankar Vijay
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