Pushbutton

Abstract

Push button (10), having: a cover (12) with a user-facing side (12a) and an inside facing away from the user (12b), wherein the cover (12) defines a keypad (14), wherein the cover (12) in the keypad (14) is at least partially elastically deformable, and wherein the cover (12) in the keypad (14) has an IR transmit area (15) in which the cover (12) is designed to transmit IR light, and an IR reflect area (16) in which the cover (12) is designed to reflect IR light; and a sensor device (18) arranged on the side of the inside (12b) of the cover (12) for detecting an actuation state of the keypad (14), wherein the sensor device (18) comprises: a transmitter (180) for emitting IR light (e1, e2); a first receiver (181) and a second receiver (182), each for detecting reflected IR light (ru1, ru2), which are arranged at different positions and a distance apart from each other; and an IR deflector (184) configured to deflect the IR light (e1, e2) emitted by the transmitter (180) partly (eu1) towards the IR transmit area (15) of the cover (12) and partly (eu2) towards the IR reflect area (16) of the cover (12), and to deflect IR light (r1) reflected by an object (17) on the user side (12a) of the IR transmit area (15) towards the first receiver (181) (ru1) and IR light (r2) reflected by the IR reflect area (16) towards the second receiver (182) (ru2).

Description

[0001] The present invention relates to a push button, in particular a multifunctional push button, for example for use in electronic household appliances.

[0002] Various types of operating elements with different functionalities are known for control devices. Among operating elements designed as pushbuttons, a distinction can be made between touch-sensitive and / or proximity-sensitive pushbuttons (so-called "touch controls") and pushbuttons that are actuated by force. Optical or capacitive sensor devices are most commonly used in practice to detect the actuation state of such pushbuttons.

[0003] WO 2017 / 174097 A1 discloses a multifunctional push button with an optical sensor device, in which the optical sensor device can differentiate between actuations of the keypad with different pressure forces depending on the detection location of the reflected radiation. In this design, the radiation emitted by the transmitter of the sensor device is reflected from the back of the cover plate and then detected by the receiver of the sensor device, whereby the detection location of the radiation reflected from the cover plate is evaluated in order to deduce the degree of deformation of the cover plate corresponding to different force applications on the keypad.

[0004] German patent DE 10 2020 209 194 A1 describes a multifunctional push button with an elastically deformable cover that includes both an IR transmission and an IR reflection area. An optical sensor device on the inside of the cover detects various actuation states—such as approach, touch, and pressure—by evaluating IR light reflections. The design allows for flexible symbol illumination using light-guiding and light-extraction elements that can be positioned independently of the sensor arrangement.

[0005] US patent 2011 / 0157097 A1 discloses a white LED component that integrates three light sources (red, green, and blue) on a single chip. The combination of these three colors produces a white light with high color purity and without the typical color shifts of conventional LED systems. This design reduces manufacturing costs and complexity compared to multi-chip LED solutions.

[0006] German patent DE 10 2010 024 592 A1 describes a decorative element with a gap-free opening made of infrared-transmitting material. An infrared light source positioned behind the opening emits light that, due to scattered light generated outside, re-enters the decorative element and is detected there by a sensor. This detection can trigger an operating function without the need for mechanical buttons or visible gaps. This enables an elegant, smooth surface with integrated sensors for touchless operation.

[0007] The object of the invention is to create an improved multifunctional push button that, in particular, also allows for greater variability in the design of the entire operating device.

[0008] This problem is solved by a push button having the features of claim 1. Particularly advantageous embodiments and further developments of the invention are the subject of the dependent claims.

[0009] The push button according to the invention has a cover with a user-facing side and an inner side facing away from the user, wherein the cover defines a keypad, wherein the cover in the keypad is at least partially elastically deformable, and wherein the cover in the keypad has an IR transmission area in which the cover is designed to be transparent to IR light and an IR reflection area in which the cover is designed to be reflective to IR light.The push button according to the invention is further characterized by a special sensor device for detecting an actuation state of the keypad, which is arranged on the inside side of the cover, wherein the sensor device comprises a transmitter for emitting IR light; a first receiver and a second receiver, each for detecting reflected IR light, which are arranged at different positions at a distance from each other; and an IR deflector, which is configured to deflect part of the IR light emitted by the transmitter towards the IR transmitting area of ​​the cover and another part of the IR light emitted by the transmitter towards the IR reflecting area of ​​the cover, to deflect IR light reflected by an object on the user side of the IR transmitting area towards the first receiver and to deflect IR light reflected by the IR reflecting area towards the second receiver.

[0010] This pushbutton design, featuring two distinct IR reflection paths across the IR transmittance or reflection area of ​​the cover within its keypad, allows a relatively simple optical sensor to detect multiple states of operation: touching or approaching the keypad, and pressing it. Furthermore, the sensor's unique design, which deflects both the emitted and reflected IR light, provides greater flexibility in positioning the sensor's transmitter and receiver. This allows the pushbutton to be adapted to various designs and configurations of the overall control mechanism.The push button design according to the invention can also be constructed without IR light-blocking barriers between the transmitter and receivers and furthermore allows the use of translucent covers or cover plates, which enables simple and variable symbol illumination of the push button, whereby the IR light of the sensor device and the visible light of the symbol illumination do not interfere with each other, even if they cross paths. Thus, the design according to the invention creates a multifunctional push button with several different detectable actuation states, which also allows for variable configuration of the symbol illumination and flexible adaptation to desired designs.

[0011] The transmitter of the sensor device can have one or more emitting elements for emitting IR light. The transmitter preferably emits a first light beam and a second light beam with slightly different orientations to each other in the direction of the IR deflector. In this case, the IR deflector can deflect the first emitted IR light beam towards the IR transmitting area of ​​the cover and deflect the second emitted IR light beam towards the IR reflecting area of ​​the cover. The first and second receivers of the sensor device are preferably equipped for spatially resolved detection of IR light, i.e., for detecting a detection location within the respective receiver where the IR light arrives. For this purpose, the first and second receivers can optionally each contain several receiving elements.The IR deflector performs the deflection of the emitted and reflected IR light rays, in particular through corresponding reflections of the IR light.

[0012] The transmitter of the sensor device is preferably designed and / or arranged such that it emits the IR light, or the first and second IR light beams, in a direction perpendicular to a distance direction between the transmitter and the cover of the IR deflector. For this purpose, a so-called side-emitting LED can preferably be used as the transmitter for lateral emission of the IR light. In this context, the term "perpendicular" does not require an exact perpendicular orientation to the distance direction. The precise direction of the emitted IR light beams depends in particular on the structure of the IR deflector used, which must deflect the two parts of the IR light, or the two IR light beams, in different directions.

[0013] Similarly, preferably at least one of the first and second receivers of the sensor device (preferably both receivers) is designed and / or arranged such that it receives the deflected reflected IR light from a direction perpendicular to a distance direction between the respective receiver and the cover of the IR deflector. For this purpose, so-called side LEDs can preferably be used as receivers for laterally detecting the IR light. The term "perpendicular" in this context does not require an exact perpendicular orientation to the distance direction. The precise direction of the deflected reflected IR light rays depends in particular on the structure of the IR deflector used.

[0014] In one embodiment of the invention, the IR deflector of the sensor device is configured in a substantially pyramidal shape. The lateral faces of the pyramid form the reflective surfaces for deflecting the emitted and reflected IR light rays. Preferably, different lateral faces of the pyramid are directed towards the transmitter, the first receiver, and the second receiver. The base of the pyramid is preferably triangular, square, or pentagonal; accordingly, the pyramid preferably has three, four, or five lateral faces. The base of the pyramid preferably lies in a plane transverse to the direction of the distance between the cover and the IR deflector.

[0015] Preferably, the sensor device further comprises a control unit configured to determine a distance or change in distance from the object (e.g., the user's finger) to the IR deflector and thus to the first receiver from the IR light detected by the first receiver, and to determine a distance or change in distance from the cover to the IR deflector and thus to the second receiver from the IR light detected by the second receiver.

[0016] This control device can preferably be configured to detect, depending on the measured distance or change in distance from the object to the IR deflector, contact of the keypad by an object and / or approach of an object to the keypad as possible actuation states of the keypad or pushbutton. The control device can also preferably be configured to detect, depending on the measured distance or change in distance from the cover to the IR deflector, deformation or degree of deformation of the keypad caused by pressure exerted on the keypad by an object as one or more possible actuation states of the keypad or pushbutton.Within the scope of the invention, the multifunctional push button can, depending on the configuration of the sensor device and its control unit, detect several different actuation states, which are selected, for example, from (i) touch or application of pressure, (ii) approach or touch or application of pressure, (iii) touch or slight or strong pressure, (iv) approach or touch or slight or strong pressure. Preferably, the sensor device and its control unit are configured such that they can detect at least three different actuation states of the push button.

[0017] In a preferred embodiment of the invention, the cover has a cover plate which is provided on its inner side outside the IR transmission range with a reflective layer. This reflective layer of the cover has one or more recesses. The cover plate is designed to be transparent to visible light at least in the area(s) of the one or more recesses. On the inner side of the cover, one or more light emitters are arranged to emit visible light, each directed towards one or more recesses in the reflective layer of the cover. In this embodiment, one or more symbolic elements can also be provided in or on the cover plate in the area(s) of the one or more recesses in the reflective layer of the cover, which are then backlit by the visible light emitted into the cover by the light emitter.The positioning of these symbol illuminations is virtually unlimited due to the inventive design of the sensor device and depends primarily only on the desired design of the entire operating device. This means that the recesses in the reflector layer and the associated light emitters can, in principle, be arranged at any location outside the IR transmission range in the keypad, i.e., in particular outside the keypad and, if necessary, also within the IR reflection range of the keypad, since the components of the sensor device do not interfere with the emitted and reflected IR light rays, the light emitters, or the visible light rays.

[0018] The above features and advantages of the invention, as well as others, will become clearer from the following description of preferred, non-limiting embodiments with reference to the accompanying drawing. This drawing shows, mostly schematically: Fig. 1 a top view of the basic scheme of a push button according to an embodiment of the present invention; Fig. 2 a perspective sectional view of the basic scheme of the push button of Fig. 1 according to a first embodiment variant; and Fig. 3 a perspective sectional view of the basic scheme of the push button of Fig. 1 according to a second design variant.

[0019] Fig. 1, Fig. 2 to Fig. Figure 3 shows the basic structure and function of a multifunctional push button according to an embodiment of the invention in various configurations. A person skilled in the art can implement specific push button designs according to the invention based on this basic structure. Identical or corresponding components are identified by the same reference numerals in all figures.

[0020] The multifunctional push button 10 has a cover 12 which defines a keypad 14 in a section that can be operated by a user. The cover 12 is elastically deformable in the area of ​​the keypad 14, so that the user can touch the keypad 14 to operate the push button 10 and, by applying pressure, slightly depress the keypad 14.

[0021] As in Fig. As shown schematically in Figure 1, the cover 12 has an IR transmission area 15 in the area of ​​the keypad 14, in which the cover 12 is transparent to IR light, and next to it an IR reflection area 16, in which the cover 12 reflects IR light.

[0022] Cover 12 has, as in Fig. 2 and Fig. Figure 3 shows a user-facing side 12a and an inner side 12b facing away from the user, and has a cover plate 122 which, except in the IR transmittance area 15, is provided with a reflector layer 124 on the inner side 12b of the cover 12. The cover plate 122 is transparent to IR light and visible light everywhere or at least at the relevant points. The cover plate 122 is made of, for example, glass, glass-ceramic, or plastic. The reflector layer 124 reflects IR light and usually also visible light. In the IR transmittance area 15, the cover plate 122 of the cover 12 is IR-transparent, and only the cover plate 122 is present. In the IR reflection area 16, the cover 12 has the reflector layer 124 in addition to its cover plate 122.

[0023] A sensor device 18 is arranged on the inside 12b of the cover 12. As shown in Fig. 1, Fig. 2 to Fig. As illustrated in Figure 3, the sensor device 18 comprises a transmitter 180, a first receiver 181, a second receiver 182 and an IR deflector 184, which may, for example, be mounted on a carrier plate (not shown) that is positioned at a distance behind the cover 12.

[0024] Transmitter 180 and IR deflector 184 lie on a first imaginary line. IR deflector 184 and receiver 181 lie on a second imaginary line. An angle η is formed between the first and second imaginary lines. IR deflector 184 and receiver 182 lie on a third imaginary line. An angle φ is formed between the first and third imaginary lines. The angles η and φ can be equal or different.

[0025] The angle η or φ is an acute, a right, or an obtuse angle. In a preferred alternative, the angle η or φ is a 180° angle, and receiver 181 and / or receiver 182 is then located on an extension of the imaginary line between transmitter 180 and IR deflector 184.

[0026] In a particularly preferred embodiment, the two angles η and φ are right angles, as shown in Fig. Figure 1 is shown. In another preferred alternative, one of the two angles η and φ is a right angle and the other of the two angles φ and η is a 180° angle, as shown in the Fig. 2 and Fig. 3 is shown.

[0027] The IR deflector 184 is positioned in the transition zone between the IR transmission area 15 and the IR reflection area 16, behind the keypad 14 of the cover 12. In this embodiment, the IR deflector 184 has a substantially pyramidal shape with a rectangular base and, accordingly, four faces for reflecting IR light. The base of the pyramid is oriented substantially in a plane perpendicular to the distance direction 19 between the cover 12 and the IR deflector 184.

[0028] In this embodiment, the transmitter 180 is arranged outside the area of ​​the keypad 14 behind the cover 12. The transmitter 180 is preferably designed as a SideLED to emit IR light perpendicular to the direction of the distance 19 between the cover 12 and the transmitter 180 in the direction of the IR deflector 184. Preferably, the transmitter 180 emits a first IR light beam e1 and a second IR light beam e2, which strike the same side surface of the IR deflector 184 at slightly different locations.

[0029] The first IR light beam e1 is deflected by the IR deflector 184 towards the IR transmittance area 15 and passes through the cover 12 in the IR transmittance area 15. If an object 17, such as a user's finger, is present on or above the keypad 14, the deflected IR light beam eu1 is reflected by the object 17, and the IR light beam r1 reflected by the object 17 is directed back through the cover 12 in the IR transmittance area 15 to the IR deflector 184. At the IR deflector 184, the IR light beam r1 reflected by the object strikes a different side surface and is deflected by this surface in a different direction than towards the transmitter 180. A first receiver 181 for detecting IR light is arranged in the direction of this deflected reflected IR light beam ru1.In this embodiment, the first receiver 181 is arranged similarly to the transmitter 180 outside the area of ​​the keypad 14 behind the cover 12 (at a distance from the transmitter 180) and is preferably designed as a SideLED to receive IR light perpendicular to the distance direction 19 from the direction of the IR deflector 184.

[0030] The first IR light beam e1 and the deflected IR light beam eu1 form an angle α, which is preferably an obtuse angle. More preferably, the angle α between the first IR light beam e1 and the deflected IR light beam eu1 is a right angle. The reflected IR light beam r1 and the reflected IR light beam ru1 form an angle β, which is preferably an obtuse angle. More preferably, the angle β between the reflected IR light beam r1 and the reflected IR light beam ru1 is a right angle. The angles α and β can be the same or different.

[0031] The second IR light beam e2 emitted by transmitter 180 is deflected by IR deflector 184 towards the IR reflection area 16 and strikes the reflector layer 124 in the IR reflection area 15. The deflected IR light beam eu2 is reflected back to the IR deflector 184 by the IR reflector layer 124. At the IR deflector 184, the IR light beam r2 reflected by the IR reflector layer 124 strikes a different surface than the previously discussed IR light beams e1, e2, r1 and is deflected by this surface in a different direction than towards transmitter 180 and the first receiver 181. A second receiver 182 for detecting IR light is arranged in the direction of this deflected reflected IR light beam ru2.In this embodiment, the second receiver 182, like the first receiver 181, is arranged outside the area of ​​the keypad 14 behind the cover 12 (at a distance from the transmitter 180 and the first receiver 181) and is preferably designed as a SideLED to receive the deflected reflected IR light ru2 perpendicular to the direction of distance 19 from the direction of the IR deflector 184. For the sake of clarity, in . Fig. 1 The deflected IR light rays eu1 and eu2 as well as the reflected IR light rays r1 and r2 are not shown.

[0032] The second IR light beam e2 and the deflected IR light beam eu2 form an angle γ, which is preferably an obtuse angle. More preferably, the angle γ between the second IR light beam e2 and the deflected IR light beam eu2 is a right angle. The reflected IR light beam r2 and the reflected IR light beam ru2 form an angle δ, which is preferably an obtuse angle. More preferably, the angle δ between the reflected IR light beam r2 and the reflected IR light beam ru2 is a right angle. The angles γ and δ can be the same or different.

[0033] In contrast to other sensor device designs, this sensor device 18 of the push button 10 according to the invention does not require any barriers to block IR light between the transmitter 180 and the receivers 181, 182. Furthermore, the positions of the transmitter 180 and the receivers 181, 182 can be selected with relative variability in order to flexibly adapt the design of the sensor device 18 to the design of the respective operating device.

[0034] The sensor device 18 further comprises a control unit 185, which is coupled to the transmitter 180 and the first and second receivers 181, 182. The control unit 185 can be mounted on the same carrier plate as the transmitter 180 and receivers 181, 182 of the sensor device 18.

[0035] As in Fig. 1, Fig. 2 to Fig. As illustrated in Figure 3, the IR light eu1 deflected by the IR deflector 184 towards the IR transmittance area 15 passes through the cover 12 and can be reflected by an object 17, such as a user's finger, outside the cover 12. The IR light r1 reflected by the object 17 again passes through the IR transmittance area 15 of the cover 12, encounters the IR deflector 184, and is deflected towards the first receiver 181. The detection location and / or the luminous intensity of the deflected reflected IR light ru1 at the first receiver 181 depend on the distance of the object 17 to the cover 12, and thus to the IR deflector 184 and the first receiver 181.The control unit 185 can then determine the distance and, optionally, the change in distance between the object 17 and the cover 12 based on the measurement signal from the first receiver 181. Based on this determination, it can then define a touch of the keypad 14 by the object 17 as an activation state of the keypad 14. Optionally, in addition to determining a touch of the keypad 14, the control unit 25 can also define an approach of an object 17 to the keypad 14 as another activation state of the keypad 14.

[0036] As also in Fig. 1, Fig. 2 to Fig. As illustrated in Figure 3, the IR light eu2, deflected by the IR deflector 184 towards the IR reflection area 16, strikes the reflector layer 124 on the inner side 12b of the cover 12 and is reflected. The IR light r2 reflected by the reflector layer 124 strikes the IR deflector 184 and is deflected towards the second receiver 182. When a user presses the keypad 14, the cover 12 is slightly deformed in the area of ​​the keypad 14 and pressed inwards towards the inner side 12b. This also changes the distance from the reflector layer 124 to the IR deflector 184 and to the second receiver 182, and consequently the detection location and / or the luminous intensity of the deflected reflected IR light ru2 at the second receiver 182. Based on the measurement signal from the second receiver 182, the control unit 185 can then determine the distance and, optionally, the change in distance between the cover 12 and the IR deflector 184.The second receiver 182 determines the value of the keypad 14, and then, based on this determination, defines an actuation state of the keypad 14 as an impression by the object 17. Optionally, the control unit 185 can also define different impression dimensions of the keypad 14 as different actuation states of the keypad 14.

[0037] In addition to the described sensor device 18, this multifunctional push button 10 also has a symbol illumination system to display symbols for informational purposes to the user on the user side 12a of the cover using visible light. Such symbol illumination can, for example, clarify the position and function of the keypad 14 for the user.

[0038] The symbol illumination system includes one or more light emitters 20 for emitting visible light, which are arranged on the user-side 12b of the cover 12 behind the cover 12. Unlike the transmitters 180 and receivers 181, 182 of the sensor device 18, the light emitters 20 are, for example, designed as top LEDs and emit the visible light o1, o2 in the direction of the cover 12. The light emitters 20 can be mounted on a carrier plate (not shown) like the components 180-184 of the sensor device 18 and can be coupled to the same control unit 185 or a different control unit.

[0039] The reflector layer 124 of the cover 12 has one or more recesses 22 in the areas corresponding to the light emitters 20, so that the visible light o1, o2 emitted by the light emitters 20 can pass through the cover 12. The recesses 22 and the light emitters 20 can be positioned in any area of ​​the cover 12, except in the area of ​​the IR transmission zone 15 in the keypad 14.

[0040] Symbol illumination can be used, for example, in the display of Fig. 1 be placed in the entire area of ​​the cover 12 outside the keypad 14 or outside the IR pass-through area 15 of the keypad 14.

[0041] Depending on the application and the desired design of the symbol illumination, a symbol element 24 can be provided in / on the cover plate 122 of the cover 12 in the area of ​​the recesses 22 of the reflector layer 124, which is backlit by the visible light o1, o2.

[0042] The symbol illumination, in combination with the sensor device 18 of the push button 10 according to the invention, offers particularly high variability, allowing the push button to be very flexibly adapted to the desired design of the respective operating device. This variability is particularly evident because the crossing of visible light o1, o2 with any IR light rays e1, e2, ru1, ru2 poses no problem, and because the sensor device 18 does not need to contain any opaque barriers. Reference number list 10 Pushbutton 12 Cover 12a User page 12b Inside 122 Cover plate 124 Reflector layer 125 recess 14 Keypad 15 IR transmission range 16 IR reflection range 17 objects 18 Sensor device 180 channels 181 first recipient 182 second recipient 184 IR deflectors 185 Control unit 19 Distance direction 20 light emitters 22 recess 24 Symbolic element e1 emitted IR light in the direction of the IR deflector e2 emitted IR light in the direction of the IR deflector eu1 deflected IR light towards the IR transmission range eu2 deflected IR light towards the IR reflection area r1 IR light reflected from object r2 IR light reflected from the reflector layer ru1 deflected reflected IR light in the direction of the first receiver ru2 deflected reflected IR light towards second receiver o1 emitted visible light O2 emitted visible light

Claims

[1] Push button (10), having: a cover (12) with a user-facing side (12a) and an inside facing away from the user (12b), wherein the cover (12) defines a keypad (14), wherein the cover (12) in the keypad (14) is at least partially elastically deformable, and wherein the cover (12) in the keypad (14) has an IR transmit area (15) in which the cover (12) is designed to transmit IR light, and an IR reflect area (16) in which the cover (12) is designed to reflect IR light; and a sensor device (18) arranged on the side of the inside (12b) of the cover (12) for detecting an actuation state of the keypad (14), wherein the sensor device (18) comprises: a transmitter (180) for emitting IR light (e1, e2); a first receiver (181) and a second receiver (182), each for detecting reflected IR light (ru1, ru2), which are arranged at different positions and a distance apart from each other; and an IR deflector (184) configured to deflect the IR light (e1, e2) emitted by the transmitter (180) partly (eu1) towards the IR transmit area (15) of the cover (12) and partly (eu2) towards the IR reflect area (16) of the cover (12), and to deflect IR light (r1) reflected by an object (17) on the user side (12a) of the IR transmit area (15) towards the first receiver (181) (ru1) and IR light (r2) reflected by the IR reflect area (16) towards the second receiver (182) (ru2). [2] Push button according to claim 1, in which the transmitter (180) of the sensor device (18) is designed and / or arranged to emit the IR light (e1, e2) in a direction transverse to a distance direction (19) between the transmitter (180) and the cover (12) to the IR deflector (184). [3] Push button according to claim 1 or 2, wherein at least one of the first receiver (181) and the second receiver (182) of the sensor device (18) is configured and / or arranged to receive the deflected reflected IR light (ru1, ru2) from a direction transverse to a distance direction (19) between the respective receiver (181, 182) and the cover (12) from the IR deflector (184). [4] Push button according to one of the preceding claims, wherein the IR deflector (184) of the sensor device (18) is designed in a pyramid shape, with different side faces of the pyramid shape facing the transmitter (180), the first receiver (181) and the second receiver (182). [5] Push button according to one of the preceding claims, wherein the sensor device (18) further comprises a control device (185) which is configured to determine a distance or change of distance from the object (17) to the IR deflector (184) from the IR light (ru1) detected by the first receiver (181) and to determine a distance or change of distance from the cover (12) to the IR deflector (184) from the IR light (ru2) detected by the second receiver (182). [6] Push button according to claim 5, in which the control device (185) is further configured to detect, depending on the determined distance (change) from the object (17) to the IR deflector (184), a touching of the keypad (14) by an object (17) and / or an approach of an object (17) to the keypad (14). [7] Pushbutton according to claim 5 or 6, in which the control device (185) is further configured to detect, depending on the determined distance (change) from the cover (12) to the IR deflector (184), a deformation or degree of deformation of the keypad (14) by an object (17) acting on the keypad (14). [8] Push button according to one of the preceding claims, wherein the cover (12) has a cover plate (122) which is provided on the inside (12b) outside the IR transmission area (15) with a reflector layer (124), the reflector layer (124) of the cover (12) has one or more recesses (22), the cover plate (122) is designed to be transparent to visible light at least in the area(s) of the one or more recesses (22), and on the side of the inside (12b) of the cover (12) one or more light emitters (20) for emitting visible light (o1, o2) are arranged in the direction of one or more recesses (22) in the reflector layer (124) of the cover (12). [9] Push button according to claim 8, in which one or more symbol elements (24) are provided in or on the cover plate (122) of the cover (12) in the area or areas of the one or more recesses (22) in the reflector layer (124) of the cover (12).

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