Two- and three-dimensional trackball with enhanced measurement optics
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United States of America Patent
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Dec 29, 1998
Issued Date -
N/A
app pub date -
Nov 16, 1995
filing date -
Nov 14, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A cursor control device for computers includes a ball whose surface is marked with a regular pattern based on the Platonic solids. The ball surface is illuminated and the rotations are measured precisely from the observed motions of the Platonic solids. The precision of measurement enables the rotation to be measured about other axes and transformed to the desired coordinates without undue deterioration of accuracy. In one embodiment, a nonplanar retainer exposes adjacent faces of a trackball for three components of rotation. In another embodiment, the ball rotation is measured inside a mouse, and the high accuracy of detection of rotation enables collection of transformed rotations from a sensor mounted to the side for a more compact design.
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