Two-- and three--dimensional trackball with coordinate transformations
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United States of America Patent
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May 12, 1998
Grant Date -
N/A
app pub date -
Nov 14, 1994
filing date -
Nov 14, 1994
priority date (Note) -
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Abstract
An improved trackball includes a nonplanar retainer and tapered sensors. A method is given to measure trackball rotations about nonorthogonal axes and transform these to rotations about standard Cartesian coordinates. The large area of the ball exposed by the nonplanar retainer and the flexibility afforded in locating the sensors facilitate a trackball which can respond to both two- and three-dimensional ball rotations.
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