Computer trackball
Files
Published version
Date
1997-04-15
DOI
Authors
Blonder, Greg
Version
Published version
OA Version
Citation
Greg Blonder. "Computer trackball." U.S. Patent 5,620,371-A.
Abstract
A computer trackball comprises a transparent outer sphere inside of which is disposed a second inner sphere. The outer diameter of the inner sphere is a little bit smaller than the inner diameter of the outer sphere. Disposed on the outer surface of the inner sphere, at one "end" thereof is a logo or other graphical image. The inner sphere tends to maintain itself in a predetermined orientation--e.g., with the graphical image pointing directly "up" relative to the keyboard or other housing fin which the trackball is held--notwithstanding rotation of the outer sphere by a user in the course of operating the trackball.