the irradiation epilator shown in fig1 comprises a base part 18 as well as a hand piece 19 , which comprises a working head 1 or which is embodied as working head 1 , respectively . see fig1 . in the illustrated embodiment , a light source 20 , in particular in the form of a laser source , the light irradiation of which is guided via a light conductor 21 to the hand piece 19 , which is connected to the base part 18 through said light conductor 21 , is thereby arranged in the base part 18 . as an alternative to this configuration , the light source 20 could also be integrated into the hand piece 19 or the hand piece 19 could be combined with the base part 18 to form a common device component , respectively . at the working head 1 , the light , which is fed or generated , respectively , is emitted via an irradiating device 2 , which can comprise corresponding optical elements and which , in the illustrated embodiment , comprises a preferably slot - shaped light emission area 23 , which can also be embodied in other emission geometries , via which the laser irradiation can be emitted to irradiate the skin , which is to be treated . said light emission area 23 is surrounded by a bead - shaped closed ring 24 , which , in its entirety , defines a projecting contour and which defines the pressure and / or sound chamber 6 in its interior , in which the light emission area 23 is arranged , wherein the pressure and / or sound chamber 6 can be coupled to the skin surface , which is to be treated , in a bell - like manner . the front side of the ring 24 thereby forms a contact surface 3 , by means of which the working head 1 can be attached to the skin surface , which is to be treated , in a conventional manner . said contact surface 3 is thereby embodied so as to be pressure - resistant and contour - fittable so that it can adapt to the body parts , which are contoured in a relief - like manner . in an undeformed embodiment , the contact surface 3 defines a plane surface , which , however , can adapt to peaks and troughs in the body surface . in the alternative , the contact surface 3 , however , can also define a concave or convex surface . due to the fact that many geometrically problematic body parts are formed in a convex or concave manner ( in particular the legs , the ankle regions or the forearm region ), a concave or convex contact surface 3 , respectively , can support a close support on such convex or concave skin surfaces , respectively . the ring 24 can thereby be embodied as a removable attachment so that , depending on the use , an operator can chose for instance between a ring 24 comprising a plane contact surface 3 and a ring 24 comprising a concave or convex contact surface 3 . for this , the ring 24 as a whole can be embodied according to the type of an elastic tube . in the embodiment illustrated in fig1 , the base section of the ring 24 is embodied according to the type of a bellows , see fig1 . in the alternative or in addition , the front section of the ring 24 can be embodied from a pressure - resistant material , which can be deformed in a foam - like manner . in particular , the ring 24 can have an inner cavity . this inner cavity can be connected to the pressure and / or sound chamber by means of openings , which are located in the interior at the annular bead so that this inner cavity of the ring 24 is a chamber , which is connected to the pressure and / or sound chamber and which is thus a part of the pressure and / or sound chamber . the ring can be made of an elastomer material so as to ensure the required pressure resistance . to record the support of the contact surface 3 on the body part , which is to be treated , and to identify a gap formation between the contact surface 3 and the skin surface , a recording device 5 , which is part of safety device 4 and comprises an impermeability sensor device 7 , is assigned to the working head 1 . in the embodiment illustrated in fig1 , said impermeability sensor device 7 comprises a pressurization device 8 in the form of an air flow generator 9 , the air outlet 25 of which can be seen in fig1 and which opens into the pressure or sound chamber 6 , respectively , within the ring 24 . a pressure sensor 10 , by means of which the over - pressure , which builds up by means of the supplied airstream , can be recorded , is furthermore arranged in the pressure or sound chamber 6 , respectively , which is defined by the ring 24 . as an alternative to the illustrated embodiment , the air outlet 25 and / or the pressure sensor 10 can be arranged below a ring 24 , which is formed so as to be hollow . air can thereby then flow from openings located on the inside of the ring 24 , which are typically not covered by the skin in response to a close contact , so that the hollow interior of the ring 24 is a part of the pressure and / or sound chamber , because a pressure balance is established between the hollow interior and the chamber surrounded by the ring 24 in response to a close contact . the signals of the pressure sensor 10 are fed to an evaluation unit 14 , which compares the resulting pressure changes to corresponding threshold values by means of a comparator unit 1 . in the event that an excessive pressure drop is determined , which always results when the contact surface 3 is not correctly supported on the skin surface , the light source 20 is immediately lowered ( meaning that its intensity is reduced or turned off ) by means of a control device 15 , which is connected to the evaluation unit 13 , so as to exclude a danger potential by means of the irradiation , which is emitted by the irradiating device 2 . the pressure sensor 10 can thereby measure the pressure prevailing in the pressure and / or sound chamber 6 as relative pressure to the ambient pressure so that the pressure measurement must not detect changes of an absolute pressure and is independent of the ambient pressure ratios . in the alternative or in addition to such a pressure or pressure change recording device , the working head 1 can also have a sound permeability recording device , as is shown in the embodiment of the working head 1 illustrated in fig2 . a sound generator 11 can hereby in particular be arranged at the working head 1 outside of the pressure and / or sound chamber 6 , that is , on the outside of the ring 24 , while , on the other hand , provision is made in the pressure and / or sound chamber 6 for a sound detector 12 , for example in the form of a microphone . advantageously , the sound generator 11 is thereby arranged in such a manner that the sound generated by it is emitted to the contact surface 3 . even though fig2 only shows one such sound generator 11 , provision can be made for a plurality of sound generators 11 and / or for a plurality of sound detectors 12 . in particular , they can be arranged so as to be distributed across the periphery of the ring 24 . in the rectangular embodiment of the ring 24 illustrated in fig2 , it would lend itself to position a sound generator 11 at each of the four limbs of the ring 24 . optionally , the at least one sound generator 11 , however , can also be arranged at the base part 18 , for example . the sound detector 12 is also connected to the evaluation unit 13 of the control device 15 , which compares the sound level drop between the sound generator 11 and the sound detector 12 to corresponding threshold values by means of the comparator unit 14 , for instance . in the event that the contact surface 3 rests correctly on the skin , which is to be treated , a substantial amplitude drop will occur from the sound generator 11 to the sound detector 12 , while this amplitude drop will be considerably less when a gap is present at the corresponding contact surface 3 . in this case , when a sufficient sound level drop does not occur , the control device 15 can also immediately lower the light source 20 so as to avoid danger . provision can furthermore be made on the working head 1 for a skin recording sensor 16 , which is arranged , for instance , between the light emission area 23 and the ring 24 , as it is shown in fig1 and 2 . by means of the skin recording sensor 16 it is determined whether the surface resting on the contact surface 3 is a skin surface . in the event that this is not the case , for example when the working head 1 is moved across a piece of textile or a piece of clothing , respectively , the control device 15 , which is connected to the skin recording sensor 16 , can also lower the light source 20 ( meaning that its intensity is reduced or turned off ). said skin recording sensor 16 can operate in a capacitive manner and / or can be embodied in an optical manner . fig1 and 2 furthermore show a motion sensor 17 , which records the movement of the working head 1 across the surface , which is to be treated , and in particular the speed thereof according to the type of a pc mouse sensor . the control device 15 , which is connected to the motion sensor 17 , can control the light source 20 as a function of the recorded movement speed , in particular lower the light source 20 as soon as a minimum speed is undershot . the motion sensor 17 can also be embodied in different ways . provision can be made , for example , for a sensor , which operates in a mechanical manner . in the alternative or in addition , provision can be made for a motion sensor 17 , which operates in an optical and / or capacitive manner .