Patent ID: 6831628
Filing Date: 2004-12-14
Classification: G06F

Abstract:
A movable cursor control device for controlling a cursor on a display screen of a digital processing system, the device comprising:a housing comprising a base having two apertures; an electromagnetic emitting device coupled to the housing; and an electromagnetic detector coupled to the housing, the electromagnetic detector detecting reflections of signals emitted from the electromagnetic emitting device and determining when the housing has been lifted from a surface based on detection of a reflection of the signals emitted from the electromagnetic emitting device, wherein the two apertures, the electromagnetic emitting device and the electromagnetic detector are located within the housing according to a predefined geometrical arrangement, the geometrical arrangement enabling the reflection of the signals emitted from the electromagnetic emitting device to be visible to the electromagnetic detector when the housing is within a distance from the surface, the distance of the housing from the surface being defined by a size of at least one spacer attached to the base of the housing.