Patent ID: 8558162

Claim:
An optical pointing device comprising a base and an actuator movable to the base, wherein the actuator comprises a reflective portion on a side facing the base, and wherein the base comprises: a light source for emitting light towards the reflective portion of the actuator, a detector comprising one or more detection units for detecting at least a part of the light reflected by the reflective portion of the actuator, a transparent element arranged between the actuator and at least one of the light source and the one or more detection units, for providing a closed transparent housing for the light source and/or the one or more detection units, means to prevent or compensate for detection of a background light originating from a non-movable constituent of the pointing device, in particular originating from a part of said base, in particular from the transparent element, wherein the sensitivity and/or threshold of the one or more detection units is arranged to be substantially proportional to an irradiance profile of the background light, and a detection circuit, wherein said detection circuit is arranged to provide a different threshold for different detection units to compensate for the background light.