OPTICAL SENSOR ARRANGEMENT FOR PROXIMITY DETECTION

摘要

An optical sensor arrangement comprises an optical barrier which is placed between a light-emitting device and a photodetector. Herein the light-emitting device and the photodetector are arranged on a first plane and are covered by a cover. The photodetector exhibits an active zone. The optical barrier exhibits an extent along a first principal axis, which is pointing parallel to the line connecting the centers of the light-emitting device and the photodetector. Herein the extent is greater than a dimension of the active zone. The optical barrier is designed to block light emitted by the light-emitting device that otherwise would be reflected by the cover by means of specular reflection and would reach the photodetector. The optical barrier is designed to pass light emitted by the light-emitting device and scattered on or above an outer surface of the cover.

主权项

1. An optical sensor arrangement comprising an optical barrier placed between a light emitting device and a photodetector, wherein
the light emitting device and the photodetector are arranged on a first plane and are covered by a cover; the photodetector exhibits an active zone; the optical barrier exhibits an extent along a first principal axis parallel to the line connecting the centers of the light emitting device and the photodetector, the extent being greater than a dimension of the active zone; the dimension of the active zone is given by a width of the active zone, that is an extent of the active zone in a direction within the first plane and perpendicular to the first principal axis; the optical barrier is designed to block light emitted by the light emitting device that otherwise would be reflected by the cover by means of specular reflection and would reach the photodetector; the optical barrier is designed to pass light emitted by the light emitting device and scattered on or above an outer surface of the cover; and the optical barrier is arranged to allow for light emitted by the light emitting device and scattered on or above the outer surface of the cover to pass around the optical barrier.