Patent ID: 7942869

Claim:
A skin treatment device for treating skin through the use of radiation, the device comprising a housing which accommodates a radiation source and which is provided with an exit opening for emitting the radiation, a detector system for detecting the presence of skin directly in front of the exit opening, said detector system comprising at least one skin presence sensor that is positioned near or in the exit opening and is configured to provide a sensor signal of a biophysical property by which the skin can be characterized, and a control unit which controls the emission of the radiation as a function of the sensor signal of the at least one skin presence sensor, wherein the control unit is constructed to determine from the sensor signal a covered portion of the exit opening that is covered by skin, wherein the covered portion is less than an entire area of the exit opening, and in that the control unit is constructed to restrict the emission of the radiation to at most said covered portion of the exit opening such that emission of radiation is possible even in cases where the exit opening is not fully covered by skin.