Computer graphics processing and selective visual display system – Display peripheral interface input device – Cursor mark position control device
Patent
1994-11-14
1998-05-12
Hjerpe, Richard
Computer graphics processing and selective visual display system
Display peripheral interface input device
Cursor mark position control device
345164, G09G 508
Patent
active
057512752
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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Hjerpe Richard
Tran Vui T.
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