Telegraphy – Systems – Position coordinate determination for writing
Patent
1993-03-29
1994-02-01
Kuntz, Curtis
Telegraphy
Systems
Position coordinate determination for writing
2502521, 356141, 364560, G08C 2100, G02B 508
Patent
active
052833968
ABSTRACT:
This invention is a method for calibrating a two beam rotationally scanned light beam interruption coordinate data input device. In particular, four reference objects which can be sensed by the effectively rotating directional sensor are disposed at measured equal interval distances along an essentially straight line. The four reference objects are positioned relative to the effectively rotating directional sensor so that each of the objects can be essentially individually sensed in turn in the course of effective rotation of the sensor. The effective angular velocity and effective center of rotation of the sensor is then determined from the known distance between adjacent reference objects and the measured time intervals between detection of adjacent pairs of reference objects by the effectively rotating directional sensor. The effective angular velocity is first determined and then the effective center of rotation of the sensor is determined from the angular velocity, distance between reference objects, and measured time intervals.
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Donner Marc D.
Feig Ephraim
Ellett, Jr. J. David
International Business Machines - Corporation
Kuntz Curtis
Loomis Paul
Morris Daniel P.
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