Device and method for operating a device

Abstract

A device (1) is provided, comprising a sensor (2) with two light sources (3, 4), each configured to emit electromagnetic radiation (31, 41), and an array (5) of photodetectors (51, 52). The device (1) further comprises a cover (6), wherein the cover (6) is specular reflective, and the cover (6) is configured to reflect at least a portion of the electromagnetic radiation (31, 41) emitted by the light sources (3, 4) towards the array (5) of photodetectors (51, 52) for determining a local orientation of the cover (6). Furthermore, a method for operating a device is provided.

Description

[0001] Description

[0002] DEVICE AND METHOD FOR OPERATING A DEVICE

[0003] The present disclosure relates to a device and to a method for operating a device.

[0004] It is an object to provide a device, which is suitable for efficiently determining a local orientation of a cover. A further object is to provide a method for efficiently determining an orientation of a cover.

[0005] According to at least one embodiment of the device, the device comprises a sensor. The sensor can be configured to detect, measure and / or analyze a distance of the sensor to a cover of the device. The sensor can be integrated into the device, e.g. an integrated sensor, and enable force touch and / or orientation sensing. For example, the sensor is or comprises a proximity sensor, in particular an optical proximity sensor. Optical proximity detection can be used for force touch sensing as an alternative to capacitive measuring sensors, for example.

[0006] For instance, the device is or comprises a tilt sensitive proximity and / or force touch sensor. In other words, the device can be or can comprise a proximity sensor, which comprises a tilt or orientation sensitivity. For instance, the device or the sensor is configured to detect a tilt or an orientation of the cover.

[0007] The sensor can comprise a main extension direction and / or a main extension plane. For example, a direction along which the cover follows the sensor, e.g. a vertical direction, can be at least approximately perpendicular to the main extension plane of the sensor .

[0008] According to at least one embodiment of the device , the sensor comprises two light sources . In other words , the device may comprise two integrated light sources . Each light source can be configured to generate and / or emit electromagnetic radiation . For instance , the light sources can each comprise a LED or a laser . For instance , the light source can comprise Lambertian characteristics . The light sources can be configured to emit electromagnetic radiation with, for example , any wavelength or any wavelength range . This can mean that , during operation of the respective light source , the light source emits electromagnetic radiation . For instance , each light source is configured to emit electromagnetic radiation in the UV, visible or IR range .

[0009] For example , the light sources or at least one light source can comprise a single LED or a single laser . For example , the light sources can each comprise a single light-emitting surface , a single chip and / or a single active region . For example , it is possible that the light sources are not part of a pixelated light source , in particular of a common pixelated light source . For example , the two light sources can be di f ferent light sources . For example , the two light sources can be arranged spaced apart from each other .

[0010] For example , one of the two light sources emits electromagnetic radiation with a first wavelength and the other of the two light sources emits electromagnetic radiation with a second wavelength . It is possible that the first wavelength is the same or at least approximately the same as the second wavelength . However, it is also possible that the first wavelength differs from the second wavelength, for instance by at least 10 nm, at least 50 nm or at least 100 nm. The difference can be at most 300 nm, at most 200 nm, at most 100 nm, or at most 50 nm.

[0011] It is possible that intensities of the electromagnetic radiation emitted by the two light sources can be approximately equal to each other. Alternatively, the intensities can differ from each other. For instance, a difference of the intensities can be in a range from 5 % to 100 %, from 5 % to 50 %, from 5 % to 30 %, from 5 % to 20 %, or from 5 % to 10 %.

[0012] For instance, in particular in serial mode, the sources may be pulsed and measurements may be conducted in very short time frames. This may require constant pulse conditions of the electromagnetic radiation emitted by the light sources. For example, the switching flanks may differ depending on power, intensity, material and / or color of the light sources or the electromagnetic radiation emitted by the light sources. That the same materials are used for the two light sources can in particular mean that the wavelengths of the electromagnetic radiation emitted by the two light sources is equal or at least approximately equal to each other.

[0013] Thus, using the same or at least approximately the same materials for the two light sources, and / or operating the two light sources such that the intensities of the electromagnetic radiation emitted by the two light sources is equal or at least approximately equal to each other can lead to more stable conditions, for instance in terms of switching time, temperature drift or other driving conditions. Hence, for instance, in case the electromagnetic radiations emitted by the two light sources comprise the same or at least approximately the same wavelengths and / or intensities , the device may be more stable during operation .

[0014] According to at least one embodiment of the device , the sensor comprises an array of photodetectors . The array can be a 2D array . The photodetectors can be arranged in a matrixlike manner . For instance , the array can be rectangular . It is possible that the array of photodetectors is a symmetric array . For instance , the array of photodetectors is at least a 2x2 array . Alternatively, it is also possible that the array of photodetectors is an asymmetric array . In this case , the array can be at least a 2x3 array, or at least a 3x5 array, for example . For instance , in case of a 3x5 array, the array of photodetectors comprises 15 photodetectors .

[0015] Each photodetector of the array of photodetectors can be configured to detect electromagnetic radiation . For example , each photodetector is configured to detect at least a portion of the electromagnetic radiation emitted by at least one of the two light sources . It is possible , that each photodetector is configured to detect at least a portion of the electromagnetic radiation emitted by each of the light sources . For detecting electromagnetic radiation, the photodetector or each photodetector may comprise a lightsensitive area . The light-sensitive area can also be referred to as light-entry area . For instance , the light-sensitive areas of the photodetectors face the cover of the device , respectively .

[0016] However, this does not necessarily mean that each photodetector detects electromagnetic radiation emitted by each of the light sources during operation of the device . It is possible , that at least one of the photodetectors of the array of photodetectors does not detect electromagnetic radiation during operation of the device or only the electromagnetic radiation generated or emitted by one of the light sources . In other words , during operation of the device , electromagnetic radiation generated or emitted by the light sources may not impinge on the light-sensitive areas of each photodetector, for example .

[0017] For instance , the photodetector is or comprises a photodiode . It is possible that the photodetector generates a photocurrent depending on the electromagnetic radiation impinging on the light-sensitive area of the photodetector .

[0018] According to at least one embodiment of the device , the device comprises a cover . For instance , the cover comprises an outer surface . The outer surface of the cover can form an outer surface of the device . The outer surface of the cover can face away from the sensor . The cover may comprise a touchable surface of the device . The cover comprises an inner surface facing the sensor . The inner surface can be radiation reflective . For instance , the inner surface of the cover is a specular surface .

[0019] For instance , the device or the sensor is configured to determine a distance and / or an orientation, for instance a local distance and / or a local orientation, between the sensor and the cover, e . g . between the sensor and the inner surface of the cover facing the sensor . The cover may be configured to move , bend, warp or being tilted during application of a force , e . g . a touch force on the cover . This can mean, for example , that the cover is flexible . The cover can be arranged above the sensor in the vertical direction. The cover can be configured to warp, to bend and / or to change its distance to the sensor when a force, in particular a touch force, is applied to the side of the cover facing away from the sensor. Alternatively or additionally, the cover can be configured to alter its orientation with respect to the main extension plane of the sensor. This can mean that the cover warps, bends or changes its distance or its orientation, during application of a force.

[0020] The cover can be at least partially glossy. For instance, the inner surface, i.e. the side of the cover facing the sensor is glossy. "Glossy" can thereby mean that the cover is specular reflective. For example, the inner surface of the cover is formed to be locally smooth so that light striking the inner surface of the cover is bounced back at the same angle, resulting in a specular reflection. For instance, the material of the cover is specular reflective. Alternatively, the cover can comprise a specular reflective coating. For instance, the cover and / or the specular reflective coating comprise a metal. It is also possible, that the cover comprises or is formed of an injection-molded part, e.g. a black in ection-molded part. For instance for enabling specular reflection, the injection-molded part can be particularly smooth, at least in places on the side of the cover facing the sensor.

[0021] According to at least one embodiment of the device, the cover, for instance the inner surface of the cover, is specular reflective. For instance, a specular reflectivity of the cover is at least 20%, for example at least 50% or at least 90%. According to at least one embodiment of the device , the cover is configured to reflect at least a portion of the electromagnetic radiation emitted by the light sources towards the array of photodetectors . This way, a local orientation, an orientation or a position of the cover may be determined . For instance , the cover is configured to specularly reflect at least a portion of the electromagnetic radiation emitted by the light sources towards the array of photodetectors . This can mean that an angle of incidence of electromagnetic radiation impinging on the cover equals an angle of reflection of electromagnetic radiation being reflected by the cover . It is also possible , that the angle of incidence is at least approximately the same as the angle of reflection . The angle of incidence and / or the angle of reflection can be understood as an angle between the electromagnetic radiation and the surface normal of the cover, respectively .

[0022] In at least one embodiment of the device , the device comprises a sensor with two light sources , each configured to emit electromagnetic radiation, and an array of photodetectors . The device can further comprise a cover, wherein the cover is specular reflective and the cover is configured to reflect at least a portion of the electromagnetic radiation emitted by the light sources towards the array of photodetectors for determining a local orientation of the cover .

[0023] An advantage of the device described herein is that an orientation, e . g . a position and / or a tilting of the cover can be detected . For instance , the device is or comprises an angular sensitive proximity sensor . With such a device , it is possible to determine or identi fy a force touch vector of a force applied to the cover . This can enable j oystick functions . For instance , the device uses triangulation, e . g . a triangulation method, for providing an improved angular detection or for determining a local orientation of the cover or a force vector of a force applied to the cover .

[0024] The device according to the present embodiment enables the detection of multiple sensing areas with only one integrated sensor . Further the sensor or the device is also able to distinguish between di f ferent force vector directions .

[0025] The present solution based on specular reflection and a 2D triangulation method enables simple , integrated optical solutions for detecting a tilt and / or a distance variation of a cover, in particular of a glossy cover, to identi fy a touch force and an orientation of the force on a cover .

[0026] According to at least one embodiment of the device , the two light sources are arranged on opposing sides of the array of photodetectors . For example , the array of photodetectors is centered between the two light sources . For instance , geometrical centers of the two light sources and a geometrical center of the detector array are arranged along one same line .

[0027] According to at least one embodiment of the device , the sensor comprises an aperture . The cover may be configured to reflect at least a portion of the electromagnetic radiation emitted by the light sources towards the array of photodetectors through the aperture .

[0028] According to at least one embodiment of the device , the aperture is defined by a non-transparent material . The non- transparent material can be arranged to cover the array of photodetectors at least in places . The aperture can be formed in places in which no non-transparent material is arranged . It is possible that the non-transparent material is nontransparent and / or non-transmissive for the electromagnetic radiation generated and / or emitted by the light sources . It is also possible for the aperture to be filled with a radiation-transmissive material . Hence , the aperture can be seen as an opening of a layer formed by the non-transparent material .

[0029] The non-transparent material and the aperture can be arranged between the array of photodetectors and the cover . For instance , the aperture overlaps with the array of photodetectors . It is possible , that the aperture , for example a center of the aperture , overlaps with a center of the array of photodetectors . For example , only one or exactly one aperture is arranged between the array sensor or the array of photodetectors and the cover .

[0030] For instance , the non-transparent material covers the array of photodetectors between the array of photodetector and the cover completely except for the region of the aperture . This can mean that only electromagnetic radiation passing through the aperture can impinge on the array of photodetectors and, for example , can be detected by at least one of the photodetectors . A si ze of the aperture can be at least the si ze of one photodetector, e . g . of one pixel of the array of photodetectors .

[0031] The aperture may be distant to the array of photodetectors .

[0032] It is possible , that a molding material , in particular a clear molding material encapsulates the array of photodetectors and / or the light source / s . Thereby, the space between the array of photodetector and / or the light source / s is not completely filled by the molding material . For example , the aperture may be formed on the side of the molding material facing the cover . It is possible that the non-transparent material is printed onto the molding material .

[0033] The aperture can be configured to form or shape an irradiance pattern on the array of photodetectors . For instance , while at least one light source emits electromagnetic radiation, the electromagnetic radiation reflected by the cover is partially prevented from impinging on the array of photodetectors by the non-transparent material .

[0034] The array of photodetectors between the light sources or in the center between the light sources allows for a two- dimensional analysis of the irradiance pattern, that is defined by the aperture . For instance , a perpendicular force on the cover can cause a shi ft of the irradiance pattern in a x direction . Thereby, the perpendicular force can be understood as a force , which is applied onto the cover, for instance in the center of the cover, and is perpendicular to the cover . For instance , a perpendicular force means any force which does not cause a tilting of the cover, at least locally, for instance in a region above the array of photodetectors . A tilt of the cover can variate the pattern in the x direction and / or in a y direction . For instance , the cover may be at least locally tilted by a force acting perpendicular on the cover in a region outside the center of the cover . This can mean that the force is asymmetrically applied to the cover . Alternatively or additionally, a force acting obliquely on the cover can lead to a tilting of the cover .

[0035] For example , in case only one light source is used, a tilt and a distance variation of the cover may disadvantageously generate a similar shi ft of the irradiance pattern .

[0036] By using two light sources arranged on opposing sides of the array of photodetectors as well as the aperture , the tilt and distance variation of the cover can be clearly identi fied by comparing the images obtained for the two light sources . A tilt of the cover can shi ft the irradiance pattern parallel , and a distance variation may variate the distance between the irradiance patterns of both light sources . Thus , from the irradiance spots of the two light sources , the distance variation and / or the tilt of the cover can be di f ferentiated .

[0037] According to at least one embodiment of the device , a lateral extension and / or a cross section of the aperture is smaller than a lateral extension and / or a cross section of the array of photodetectors , respectively . For instance , the aperture is configured to generate a light spot on the array of photodetectors . In other words , the irradiance pattern formed by the aperture during operation of the device can be a light spot . The si ze of the light spot , e . g . the lateral extension of the light sport , can be chosen such that not all photodetectors are illuminated simultaneously . This way, a shi ft of the irradiance pattern or the light spot can be easily detected, analyzed or interpolated by the array of photodetectors .

[0038] According to at least one embodiment of the device , the aperture comprises a circular shape . Alternatively, the aperture can comprise a rectangular shape or any other shape, e.g. a free form. For example, the aperture is arranged spaced apart from the array of photodetectors along a vertical direction.

[0039] According to at least one embodiment of the device, the array of photodetectors comprises at least four photodetectors forming at least a 2 x 2 array. It is also possible that the array of photodetectors comprises at least 15 photodetectors forming at least a 3x5 array. With such an array of photodetectors, a shift of the irradiance patterns of the two light sources on the array of photodetectors can be efficiently detected. The number of the photodetectors can be from 4 to 225, from 4 to 100, from 4 to 64, from 4 to 36, from 4 to 16, or from 15 to 225, from 15 to 100, from 15 to 64 or from 15 to 36.

[0040] It is further possible to apply a plurality of photodetectors in the array of photodetectors. An increased number of photodetectors may improve a resolution of the device. However, an increased number of photodetectors may increase the effort for data processing and / or data analysis.

[0041] According to at least one embodiment of the device, the cover is flexible. It is possible, that the cover is configured to be deformed under application of a force onto the cover. A deformation of the cover can at least locally change the orientation of the cover, e.g. the tilt of the cover or the distance between the cover and the sensor. This change in the orientation can be detected by the sensor. With this, for example, the force vector can be determined. According to at least one embodiment of the device , a light barrier is arranged between the light sources and the array of photodetectors , respectively . The light barrier can be a black barrier . For instance , the light barrier is configured to prevent , can prevent or can at least reduce a direct cross-talk between the light sources and the photodetectors of the array of photodetectors . For this , the light barrier can be non-transparent or non-transmissive for the electromagnetic radiation generated or emitted by the light sources .

[0042] It is possible that the light barrier is formed in one piece and / or completely surrounds the array of photodetectors in the lateral directions . Alternatively, two light barriers can be arranged between the array of photodetectors and one of the two light sources , respectively . The light barrier / s can be surrounded by the molding material or embedded into the molding material . For instance , the light barrier / s can be referred to as integrated light barrier / s .

[0043] According to at least one embodiment of the device , the light barrier and a non-transparent material defining an aperture and covering the array of photodetectors at least in places are formed in one piece . For instance , the light barrier is formed of the non-transparent material .

[0044] According to at least one embodiment of the device , a shape of at least one photodetector of the array of photodetectors is rectangular, triangular or hexagonal .

[0045] According to at least one embodiment of the device , the sensor of the device is an integrated touch sensor . The cover may form an outer surface of the device . The sensor can be configured to sense a touch and a direction, position and / or movement of the touch on the cover .

[0046] Furthermore , a method for operating a device is provided . The method for operating a device can preferably be performed to operate the device described herein . This means all features disclosed for the device are also disclosed for the method for operating a device , and vice-versa .

[0047] According to at least one embodiment of the method for operating a device , the method comprises providing a device . The device can be a device described herein . In other words , the method for operating a device is configured to operate a device described herein .

[0048] According to at least one embodiment , the method for operating a device comprises emitting electromagnetic radiation from the two light sources towards the cover . For instance , at least a portion of the electromagnetic radiation is specular reflected towards the array of photodetectors . In particular, the specular reflected electromagnetic radiation passes through an aperture located between the array of photodetectors and the cover prior to impinging on at least one of the photodetectors of the array of photodetectors .

[0049] According to at least one embodiment of the method for operating a device , a force is applied on the cover . The force can be applied by a user of the device . For example , the force is applied on the cover from a side of the cover facing away from the sensor .

[0050] According to at least one embodiment , the method comprises determining a local orientation of the cover from the signals of the array of photodetectors . That a local orientation is determined can mean that a tilt and / or a distance variation of a distance between the cover and the sensor are determined from the signals of the array of photodetectors .

[0051] According to at least one embodiment , the method for operating a device comprises : providing a device ; emitting electromagnetic radiation from the two light sources towards the cover, wherein at least a portion of the electromagnetic radiation is specular reflected towards the array of photodetectors ; applying a force on the cover ; and determining a local orientation of the cover from the signals of the array of photodetectors .

[0052] The signals , e . g . the photocurrents , generated by the photodetectors of the array of photodetectors can be read out . With the irradiance spot information of both light sources , the distance variation and / or the tilt of the cover can be ef ficiently determined .

[0053] According to at least one embodiment of the method for operating a device , the two light sources are operated simultaneously . This can mean that an irradiance pattern on the array of photodetectors comprises two light spots . The two light spots can be arranged spaced apart from each other . However, it is also possible , that the two light spots overlap .

[0054] According to at least one embodiment of the method for operating a device , the two light sources are operated sequentially . This can mean that initially one of the light sources emits electromagnetic radiation generating a light spot on the array of photodetectors . Then, the signal generated by the light spot of the light source can be read out . Subsequently, the other one of the light sources may emit electromagnetic radiation generating another light spot on the array of photodetectors . Then, the signal generated by the other light spot of the other light source can be read out . By operating the light sources sequentially, the number of required photodetectors in the array of photodetectors can be decreased, for example .

[0055] According to at least one embodiment of the method for operating a device , the tilt and / or the distance variation is determined by comparing the images obtained with the array of photodetectors for the respective light sources .

[0056] Further advantages and advantageous designs and further developments of the device and the method for operating a device will become apparent from the following exemplary embodiments , which are described below in association with the figures .

[0057] Figures 1 , 2A, 2B, 2C, 3A, 3B, 3C, 4 , 5 , 6 , 7A, 7B, 7C, 8A, 8B, 8C, 9A, 9B, 9C, 10A, 10B, 10C, 11 , 12 and 13 show schematic and / or detailed views of di f ferent exemplary embodiments of a device or of a method for operating a device .

[0058] Figure 14 shows a schematic view of a device according to a comparative example .

[0059] Identical , similar or equivalent elements are marked with the same reference signs in the figures . The figures and the proportions of the elements represented in the figures among each other are not to be considered as true to scale . Rather, individual elements may be oversi zed for better representability and / or comprehensibility . Identical or ef fectively identical components and parts might be described only with respect to the figures where they occur first . Their description is not necessarily repeated in successive figures .

[0060] Figure 1 shows a schematic view of a device 1 according to an exemplary embodiment . The device 1 comprises a sensor 2 and a cover 6 . The sensor 2 comprises two light sources 3 , 4 . Each light source 3 , 4 is configured to generate and / or emit electromagnetic radiation 31 , 41 , for instance first electromagnetic radiation 31 or second electromagnetic radiation 41 , respectively . The first electromagnetic radiation 31 and the second electromagnetic radiation 41 can comprise electromagnetic radiation with the same or at least approximately the same wavelength . Alternatively, the wavelengths of the first electromagnetic radiation 31 and the second electromagnetic radiation 41 can di f fer from each other .

[0061] The sensor 2 further comprises an array 5 of photodetectors 51 , 52 . The photodetectors 51 , 52 of the array 5 may be integrated into a common chip 16 . The sensor 2 may further comprise a carrier 11 . For instance , the light sources 3 , 4 and / or the array 5 of photodetectors 51 , 52 are arranged on the carrier 11 . For example , the light sources 3 , 4 and / or the array 5 of photodetectors 51 , 52 are arranged between the carrier 11 and the cover 6 .

[0062] The two light sources 3 , 4 of the sensor 2 are arranged on opposing sides of the array 5 of photodetectors 51 , 52 . It is possible that the array 5 of photodetectors 51 , 52 is centered between the two light sources 3 , 4 .

[0063] The array 5 of photodetectors 51 , 52 may comprise at least four photodetectors 51 , 52 forming at least a 2 x 2 array 5 . For example , shown here , five photodetectors 51 , 52 are arranged along a first lateral direction x . The first lateral direction x is at least approximately perpendicular to a second lateral direction y and to a vertical direction z . For instance , the vertical direction z is at least approximately perpendicular to a main extension plane of the sensor 2 or the array 5 of photodetectors 51 , 52 . The first and second lateral directions x, y can extend at least approximately in parallel to the main extension plane of the sensor 2 or of the array 5 of photodetectors 51 , 52 .

[0064] A shape of at least one of the photodetectors 51 , 52 of the array 5 of photodetectors 51 , 52 may be rectangular, triangular or hexagonal .

[0065] The cover 6 of the device 1 may be specular reflective . It is possible that the cover 6 comprises a reflective surface 13 , in particular a specularly reflective surface 13 . In particular, the cover 6 can be specular reflective at least on the side of the cover 6 facing the sensor 2 . For instance , the reflective surface 13 can be at least partially arranged on or form the side of the cover 6 facing the sensor 2 . This can mean that the cover 6 is configured to reflect at least a portion of the electromagnetic radiation 31 , 41 emitted by the light sources 3 , 4 towards the array 5 of photodetectors 51 , 52 . This way, for example , a local orientation of the cover 6 can be determined . For instance , for changing its local orientation, the cover 6 may be flexible . It is possible that the cover 6 is configured to be deformed under application of a force F onto the cover 6. The force F is applied from a side of the cover 6 facing away from the sensor 2, for example. The force F can be applied by an user of the device 1, e.g. by a finger of the user. This can mean that the device 1 is configured for detecting or analysing a touch on the cover 6. For example, the sensor 2 of the device 1 is an integrated touch sensor. The cover 6 may form or comprise an outer surface of the device 1. This way, the sensor 2 can be configured to sense a touch, a direction and / or a position of the touch on the cover 6.

[0066] The device 1 can further comprise an aperture 8. The aperture 8 is located between the array 5 of photodetectors 51, 52 and the cover 6. For example, the aperture 8 overlaps with a center of the array 5 of photodetectors 51, 52. The aperture 8 can be defined by a non-transparent material 7. That the aperture 8 is defined by the non-transparent material 7 can mean that the aperture 8 is formed in a region in which no non-transparent material 7 is arranged. For instance, the non-transparent material 7 surrounds, e.g. completely surrounds the aperture 8 laterally, e.g. along the lateral directions x, y.

[0067] The non-transparent material 7 can be arranged to cover the array 5 of photodetectors 51, 52 at least in places. It is possible, that the non-transparent material 7 is arranged between the array 5 of photodetectors 51, 52 and the cover 6.

[0068] The aperture 8 can comprise a lateral extension, e.g. a small lateral extension. For instance, a lateral extension of the aperture is at most 250 nm, for example at most 150 nm, at most 100 nm or at most 50 nm . The lateral extension can be understood as an extension of the aperture 8 along at least one of the lateral directions x, y or along both lateral directions x, y . For example , the lateral extension of the aperture 8 is smaller than a lateral extension of the array 5 of photodetectors 51 , 52 . By the aperture 8 comprising a small lateral extension, the aperture 8 may generate a light spot 9 on the array 5 of photodetectors 51 , 52 . In other words , the aperture 8 can be configured to generate a light spot 9 on the array 5 of photodetectors 51 , 52 . That the aperture 8 generates a light spot 9 can be understood such that the electromagnetic radiation 31 , 41 emitted by at least one of the light sources 3 , 4 and reflected by the cover 6 can impinge on the array 5 of photodetectors 51 , 52 only after passing through the aperture 8 . This way, a light spot 9 on the array 5 can be created .

[0069] The aperture 8 can be arranged spaced apart from the array 5 of photodetectors 51 , 52 along the vertical direction z . This can mean that the non-transparent material 7 defining the aperture 8 is not in direct contact with the array 5 of photodetectors 51 , 52 .

[0070] For example , the aperture 8 comprises a circular shape . In particular, the aperture 8 can comprise the circular shape in top view, e . g . from the side of the aperture 8 at which the cover 6 is arranged . The lateral extension of the aperture 8 can then correspond to a diameter of the aperture 8 . However, also other shapes are possible . For instance , the aperture 8 can also comprise a rectangular, triangular or hexagonal shape or a combination thereof . A light barrier 10 can be arranged between the first light source 3 and the array 5 of photodetectors 51 , 52 . It is also possible that the light barrier 10 or a further light barrier 10 is arranged between the second light source 4 and the array 5 of photodetectors 51 , 52 . For instance , the respective light barriers 10 are only arranged on the side of the array 5 of photodetectors 51 , 52 facing one of the light sources 3 , 4 . Alternatively, the light barrier 10 may surround the array 5 of photodetectors 51 , 52 on a side of the array 5 at which no light source is arranged . It is possible that the light barrier 10 surrounds the array 5 of photodetectors 51 , 52 laterally . In other words , the light barrier 10 can completely surround the array of photodetectors laterally, e . g . in lateral directions x, y .

[0071] The light barrier 10 and the non-transparent material 7 defining the aperture 8 and covering the array 5 of photodetectors 51 , 52 at least in places can be formed in one piece .

[0072] The device 1 or the sensor 2 can comprise a molding material 14 , in particular a clear molding material 14 . The molding material 14 can form a molded body . The molding material 14 may encapsulate the array of photodetectors and / or the light source / s of the sensor 2 . For example , the molding material 14 is translucent , transmissive or transparent for the first electromagnetic radiation 31 and the second electromagnetic radiation 41 emitted or generated by the respective light sources 3 , 4 . For instance , the molding material 14 comprises or consists of an epoxy .

[0073] The molding material 14 may not be in direct contact with the cover 6 . This way, it can be ensured that the cover 6 can be deformed or change its orientation, at least its local orientation under application of a force F .

[0074] During operation of the device 1 , the first light source 3 and / or the second light source 4 may emit electromagnetic radiation 31 , 41 towards the cover 6 . At least a portion of the electromagnetic radiation 31 , 14 impinging on the cover 6 , in particular on the reflective surface 13 of the cover, e . g . the specular reflective surface 13 , is reflected, for instance specularly reflected, towards the array 5 of photodetectors 51 , 52 .

[0075] A force F may be applied to the cover 6 , in particular from a side of the cover 6 facing away from the sensor 2 . This force F can lead to a tilting or a local tilting of the cover 6 with respect to the main extension plane of the sensor 2 , a deformation of the cover 6 and / or a change in distance of a distance D between the cover 6 and the sensor 2 at least locally, e . g . in the region in which the force F is applied to the cover 6 . This may shi ft the position of the light spot / s 9 of the electromagnetic radiation 31 , 41 on the array 5 of photodetectors 51 , 52 .

[0076] Figures 2A, 2B and 2C show a device 1 according to an exemplary embodiment in which a force F is applied perpendicular to the main extension plane of the sensor 2 . The orientation of the cover 6 can be parallel or at least approximately parallel to the main extension plane of the sensor 2 , at least locally . Figure 2A shows that the force F is a perpendicular force , which can also be referred to as symmetric force . Figure 2B shows a device 1 comprising a housing 12 . The cover 6 comprises an outer surface of the device 1 . This means that the cover 6 is at least partially free of the housing 12 on a side of the cover 6 facing away from the sensor 2 .

[0077] It is indicated by the arrow in Figure 2C that pushing or moving the cover 6 or the reflective surface 13 closer to the sensor 2 may cause a movement of the light spots 9 along the first lateral direction x . In particular, the light spot 9 generated by the first light source 3 moves further away from the first light source 3 . The light spot 9 resulting from the electromagnetic radiation 41 emitted by the second light source 4 moves further away from the second light source 4 . For instance , the angle of incidence of the electromagnetic radiation 31 , 41 passing through the aperture 8 increases with decreasing distance D between the cover 6 and the sensor 2 . Thus , a distance variation of the distance D between the cover 6 and the sensor 2 can be determined by comparing the images obtained with the array 5 of photodetectors 51 , 52 for the respective light sources 3 , 4 .

[0078] The exemplary embodiment of the device 1 or the method for operating a device 1 shown in Figures 3A, 3B and 3C di f fers from the exemplary embodiment shown in Figures 2A, 2B and 2C in that an asymmetric force is applied to the cover 6 of the device 1 . In this case , as indicated by the arrow in Figure 3C, the light spots 9 may both be shi fted more towards the side of the array 5 at which the second light source 4 is arranged . For instance , an irradiance pattern of the light spots 9 is moved in parallel , e . g . along the first lateral direction x . This can mean that a distance between the light spots 9 remains equal or at least approximately equal . Figures 4, 5 and 6 show different representations of a device 1 according to an exemplary embodiment. For instance, in the exemplary embodiment shown here, only the first light source 3 emits electromagnetic radiation 31. For instance, the two light sources 3, 4 of the device 1 are operated sequentially.

[0079] In Figure 5, possible extension and / or distances between parts of the device 1 according to an exemplary embodiment are shown. On the x- , y- and z-axis the positions are shown in nm. For instance, shown here, the aperture 8 overlaps with the center of the array 5 of photodetectors 51, 52. The array 5 of photodetectors 51, 52 can be asymmetric, e.g. a 5 x 3 array. A distance between the aperture 8 and the sensor 2 can be approximately 700 nm. The distance D between the cover 6 and the sensor 2 can be approximately 3200 nm. Shown here, further apertures 15 can be arranged between the respective light source 3, 4 and the cover 6. For example, a field of view of the light source / s 3, 4 can be limited, restricted and / or tilted by at least one further aperture 15. For instance, the further aperture 15 or each further aperture 15 overlaps with one of the light sources 3, 4. It is possible that the further aperture 15 or each further aperture 15 protrudes the light source 3, 4 in a direction towards the array 5 of photodetectors 51, 52.

[0080] Figure 6 shows a top view of the sensor 2 of the device 1 according to an exemplary embodiment. The first light source 3 emits electromagnetic radiation 31, resulting in the light spot 9 impinging on the array 5 of photodetectors 51, 52. The second light source 4 does not emit electromagnetic radiation. Thus, only one or exactly one light spot 9 may be detected by the array 5 of photodetectors 51, 52. Figures 7A, 7B and 7C show a device 1 according to an exemplary embodiment . The device 1 shown here di f fers from the device 1 of the exemplary embodiment of Figures 5 and 6 in that both light sources 3 , 4 emit electromagnetic radiation 31 , 41 . It is possible that the two light sources 3 , 4 are operated simultaneously . Alternatively, the representation shown here can also be an overlap of two states , wherein the light sources 3 , 4 are operated sequentially and wherein in each state only one light source of the light sources 3 , 4 emits electromagnetic radiation .

[0081] As shown in Figure 7B, the distance D between the cover 6 and the sensor 2 can be approximately 4200 nm . Figure 7C shows that this can result in a distance between the centers of the two light spots 9 of approximately 200 nm .

[0082] The device 1 shown in Figures 8A, 8B and 8C di f fers from the device 1 shown in Figures 7A, 7B and 7C in that the distance D between the cover 6 and the sensor 2 is decreased, e . g . by the application of the force F, Figure 8A. It can be derived from Figure 8B that the distance D is approximately 2300 nm . Such a distance D can result in a distance between the centers of the two light spots 9 of approximately 600 nm, Figure 8C .

[0083] Figures 9A, 9B and 9C show a case in which a tilting force F is applied to the cover 6 of the device 1 according to an exemplary embodiment . A tilt of the cover 6 can lead to a parallel shi ft of the light spots 9 along the first lateral direction x and the second lateral direction y . The tilt of the cover 6 can be determined by comparing the images obtained with the array 5 of photodetectors 51 , 52 for the respective light sources 3 , 4 , in particular for the electromagnetic radiation 31, 41 emitted by the respective light sources 3, 4.

[0084] In the exemplary embodiment shown in Figures 10A, 10B and 10C, the cover 6 is more tilted compared to the exemplary embodiment of Figures 9A, 9B and 9C. This results in a larger shift of the light spots 9 along the lateral directions x, y, namely the first lateral direction x and the second lateral direction y.

[0085] Figure 11 shows a sensor 2 according to an exemplary embodiment. The sensor 2 shown in Figure 11 comprises a carrier 11. A chip 16 comprising the array 5 of photodetectors 51, 52 is arranged on the carrier 11. The two light sources 3, 4 are arranged on the carrier 11 on opposing sides of the array 5. A component 18, e.g. a glass block, is arranged on the chip 16, covering the array 5 of photodetectors 51, 52. The component 18 can be transparent, transmissive or translucent for the electromagnetic radiation emitted by the light source / s 3, 4. The non-transparent material 7 defining the aperture 8 is arranged on the component 18. For instance, the aperture 8 is formed or defined by a black pattern on a cover block or cover plate, e.g. the component 18.

[0086] The sensor 2 comprises a packaging material 19. The packaging material 19 can comprise or consist of or form a packaging film. For instance, the packaging material comprises a transmissivity of at most 30%, for example at most 20%, at most 10% or a most 5%. In particular, the transmissivity of the packaging material can be less than 1%. For instance, the packaging material comprises a moldable material, e.g. a black mold material. The packaging material may comprise or form a lid or a cap.

[0087] The packaging material 19 surrounds or encapsulates, e.g. seals or hermetically seals, the array 5 of photodetectors 51, 52 and / or the light sources 3, 4 at least partially. The packaging material 19 can comprise the further apertures 15, arranged above the light sources 3, 4. A cover glass 17 can be arranged in the further apertures 15 of the packaging material 19.

[0088] The packaging material 19 can overlap with the nontransparent material 7 at least in an edge region of the component 18. The packaging material 19 can be different from the transparent material 7. The packaging material 19 can surround, e.g. completely surround, the cover glass / es 17, the non-transparent material 7, the component 18, the chip 16 and / or the light sources 3, 4 in the lateral directions x, y.

[0089] Figure 12 shows a sensor 2 according to a further exemplary embodiment. The sensor 2 shown in Figure 12 differs from the sensor 2 shown in Figure 11 in that the aperture 8 is defined or restricted by the packaging material 19. This can mean that the packaging material 19 equals the non-transparent material 7 or forms the non-transparent material 7. No additional non-transparent material 7 may be present in the sensor 2. In this case, the packaging material 19 covers the component 18 on a side of the component 18 facing away from the array 5 in places. In particular the packaging material 19 completely covers the side of the component 18 facing away from the array 5 except in the region of the aperture 8. Figure 13 shows a sensor 2 according to another exemplary embodiment. The sensor 2 shown here may correspond to the sensor 2 shown in Figure 1. The sensor 2 differs from the sensors 2 of Figures 11 and 12 in that the light sources 3, 4 as well as the array 5 of photodetectors 51, 52 are encapsulated by a clear molding material 14. The nontransparent material 7 defining the aperture 8 is arranged on a top side of the molding material 14, e.g. the side of the molding material 14 facing away from the carrier 11.

[0090] Figure 14 shows a device 1 according to a comparative example. The device 1 comprises a light source 3, in particular only one light source 3, a photodiode 51, in particular only one photodiode 51 and a cover 6. The cover 6 is diffusely reflective. With such a device 1 it is only possible to detect one single point force F applied to the cover 6. It is not possible to determine the position or a movement of the force F. For this, multiple sensors 2 would be required in the device 1.

[0091] The invention described herein is not limited by the description given with reference to the embodiments. Rather, the invention encompasses any novel feature and any combination of features, including in particular any combination of features in the claims, even if this feature or this combination is not itself explicitly indicated in the claims or embodiments.

[0092] This patent application claims the priority of German patent application 10 2024 117 428.5, the disclosure content of which is hereby incorporated by reference. References

[0093] 1 device

[0094] 2 sensor

[0095] 3 first light source

[0096] 31 first electromagnetic radiation

[0097] 4 second light source

[0098] 41 second electromagnetic radiation

[0099] 5 array of photodetectors

[0100] 51 first photodetector

[0101] 52 further photodetector

[0102] 6 cover

[0103] 7 non-transparent material

[0104] 8 aperture

[0105] 9 light spot

[0106] 10 light barrier

[0107] 11 carrier

[0108] 12 housing

[0109] 13 reflective surface

[0110] 14 molding material

[0111] 15 further aperture

[0112] 16 chip

[0113] 17 cover glass

[0114] 18 component

[0115] 19 packaging material

[0116] F force x first lateral direction y second lateral direction z vertical direction

Claims

Claims1. Device (1) comprising- a sensor (2) with- two light sources (3, 4) , each configured to emit electromagnetic radiation (31, 41) , and- an array (5) of photodetectors (51, 52) , and- a cover (6) , wherein- the cover (6) is specular reflective, and- the cover (6) is configured to reflect at least a portion of the electromagnetic radiation (31, 41) emitted by the light sources (3, 4) towards the array (5) of photodetectors (51, 52) for determining a local orientation of the cover (6) .

2. The device (1) according to the previous claim, wherein the two light sources (3, 4) are arranged on opposing sides of the array (5) of photodetectors (51, 52) , and the array(5) of photodetectors (51, 52) is centered between the two light sources (3, 4) .

3. The device (1) according to one of the previous claims, wherein the sensor comprises an aperture (8) and the cover(6) is configured to reflect at least a portion of the electromagnetic radiation (31, 41) emitted by the light sources (3, 4) towards the array (5) of photodetectors (51, 52) through the aperture (8) .

4. The device (1) according to the previous claim, wherein the aperture (8) is defined by a non-transparent material(7) , the non-transparent material (7) is arranged to cover the array (5) of photodetectors (51, 52) at least in places, wherein the non-transparent material (7) and the aperture (8)are arranged between the array (5) of photodetectors (51, 52) and the cover (6) , and wherein the aperture overlaps with a center of the array (5) of photodetectors (51, 52) .

5. The device (1) according to one of the claims 3 to 4, wherein a lateral extension of the aperture (8) is smaller than a lateral extension of the array (5) of photodetectors (51, 52) , and the aperture (8) is configured to generate a light spot (9) on the array (5) of photodetectors (51, 52) .

6. The device (1) according to one of the claims 3 to 5, wherein the aperture (8) comprises a circular shape and is arranged spaced apart from the array (5) of photodetectors along a vertical direction (z) .

7. The device (1) according to one of the previous claims, wherein the array (5) of photodetectors (51, 52) comprises at least four photodetectors (51, 52) forming at least a 2 x 2 array ( 5 ) .

8. The device (1) according to one of the previous claims, wherein the cover (6) is flexible and configured to be deformed under application of a force (F) onto the cover (6) .

9. The device (1) according to one of the previous claims, wherein a light barrier (10) is arranged between the light sources (3, 4) and the array (5) of photodetectors (51, 52) , respectively .

10. The device (1) according to the previous claim, wherein the light barrier (10) and a non-transparent material (7) defining an aperture (8) and covering the array (5) ofphotodetectors (51, 52) at least in places are formed in one piece .

11. The device (1) according to one of the previous claims, wherein a shape of at least one photodetector (51, 52) of the array (5) of photodetectors (51, 52) is rectangular, triangular or hexagonal.

12. The device (1) according to one of the previous claims, wherein the sensor (2) of the device (1) is an integrated touch sensor and the cover (6) forms an outer surface of the device (1) , wherein the sensor (2) is configured to sense a touch and a direction or position of the touch on the cover (6) .

13. Method for operating a device (1) , comprising:- providing a device (1) according to one of the claims 1 to 12,- emitting electromagnetic radiation (31, 41) from the two light sources (3, 4) towards the cover (6) , wherein at least a portion of the electromagnetic radiation (31a, 41a) is specular reflected towards the array (5) of photodetectors (51, 52) ,- applying a force (F) on the cover (6) , and- determining a local orientation of the cover (6) from the signals of the array (5) of photodetectors (51, 52) .

14. The method for operating a device (1) according to the previous claim, wherein the two light sources (3, 4) are operated simultaneously.

15. The method for operating a device (1) according to claim 13, wherein the two light sources (3, 4) are operated sequentially .

16. The method for operating a device (1) according to the previous claim, wherein a tilt and / or a distance variation is determined by comparing the images obtained with the array (5) of photodetectors (51, 52) for the respective light sources ( 3 , 4 ) .

Images