Two-axis cursor control apparatus

Details Two-axis cursor control apparatus Two-axis cursor control apparatus

G - Physics

06

F

G06F 3/033 (2006.01)

Patent

CA 2332712

A reduced-size cursor control apparatus includes a spherical ball; two rotors in contact with the spherical ball and two corresponding axles; two screw devices associated with each rotor-axle pair, each screw device having a continuous helical thread; and a plurality of light sensors, each associated with a screw device. When the spherical ball is rotated by the user, its motion about each axis of rotation is translated to one of the screw devices by means of the corresponding rotor-axle pair. The rotation of the screw devices causes the helical thread on each to momentarily interrupt the light beam generated by each sensor at least once during each revolution of the screw device, thereby generating a signal which is translated into two-dimensional motion of a cursor on an electronic display screen.

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