Optical pointing device having a transparent housing element
AssigneeNXP B.V.
InventorKim Phan Le
Life of this patent
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Abstract
The optical pointing device of the present invention comprises a base and an actuator movable connected 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 of more detection units for detecting at least a part of the light reflected by the reflective portion of the actuator, and a transparent element arranged between the actuator and at least one of the light source and the detection units, for providing a closed transparent housing for the light source and/or the detection units.
Claims20
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.
A pointing device comprising a base and an actuator movable connected to the base, which base comprises:
- a light source for illuminating the actuator,
- a detector comprising one or more detection units for detecting light reflected by the actuator,
- means to prevent or compensate for detection of a substantially constant background light originating from a non-movable constituent of the pointing device, 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.
A pointing device comprising a base and an actuator movable connected to the base, which base comprises:
- a light source for illuminating the actuator,
- a detector comprising one or more detection units for detecting light reflected by the actuator, and
- means to prevent or compensate for detection of a substantially constant background light originating from a non-movable constituent of the pointing device, 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, wherein the different detection units are provided with different photosensitive areas, wherein the photosensitive area of a first detection unit arranged at a first location with a high background irradiance is smaller than the photosensitive area of a second detection unit arranged at a second location with less background irradiance, in particular wherein the photosensitive areas of the first and second detection unit are arranged to provide substantially the same threshold for the first and second detection unit.
Dependencies are inferred from the claim text.