Sun protection device

Abstract

The invention relates to a sun protection device (10a; 10b), in particular sunglasses (12a; 12b), having at least one optical sun protection filter (14a; 14b) with at least one liquid crystal cell (16a; 16b). According to the invention, the optical sun protection filter (14a; 14b) has at least one photochromic protective element (20a; 20b) whose transmittance changes, in particular, as a function of the amount of solar radiation.

Description

Technical Field

[0001] This invention relates to a sun protection device, particularly sunglasses. Background Technology

[0002] According to EP 3 223 067, a type of sunglasses is known which has at least one optical sun protection filter having at least one liquid crystal cell. Summary of the Invention

[0003] The object of this invention is, in particular, to provide a universal device with improved performance in terms of comfort and usability. According to the invention, this object is achieved through the features of the invention, and advantageous designs and improvements of the invention can be obtained from the invention itself.

[0004] The present invention relates to a sun protection device, particularly sunglasses, having at least one optical sun protection filter having at least one liquid crystal cell.

[0005] The proposed optical sunscreen filter has at least one photochromic protective element whose transmittance varies, in particular, depending at least on the amount of solar radiation. This advantageously ensures a high degree of adaptability of the sunscreen device to the amount of solar radiation. It advantageously ensures protection against solar radiation in a particularly simple manner. Advantageously, it allows for a particularly high level of comfort for the user of the sunscreen device.

[0006] The photochromic protective element is preferably configured to be transparent. "Photochromic protective element" should be understood in particular as a photochromic lens, a photochromic layer, or the like. Preferably, this should be understood as an element whose transmittance depends on the amount of light incident, especially solar radiation. Preferably, the photochromic protective element is configured to darken as the amount of light incident, especially solar radiation, increases, particularly by automatically darkening, thereby reducing the transmittance of the photochromic protective element. Particularly preferably, the photochromic protective element is configured to brighten as the amount of light incident on the photochromic protective element decreases, particularly by solar radiation, preferably by automatically brightening, thereby increasing the transmittance of the photochromic protective element. In particular, the photochromic protective element has maximum transmittance after a defined adaptation time when there is no activation light incident on the photochromic protective element. The defined adaptation time is preferably a maximum of 20 minutes, particularly preferably a maximum of 15 minutes. Preferably, the defined adaptation time depends on the material forming the photochromic protective element.

[0007] The photochromic protective element may, for example, be at least partially formed of a base carrier, preferably at least partially formed of glass, polycarbonate, cellulose triacetate, or other suitable plastic, wherein, particularly in at least one embodiment, silver chloride molecules or the like are embedded in the base carrier. Alternatively or additionally, organic photochromic molecules may be embedded in the base carrier. It is also conceivable that the base carrier is formed of a component or element of an optical sunscreen filter, such as a polarizing layer or the like of an optical sunscreen filter. The photochromic protective element may, for example, be arranged as the outermost layer of an optical sunscreen filter or at other locations within the optical sunscreen filter. Preferably, particularly at least in the main extending plane of the photochromic protective element, the photochromic protective element is at least partially curved. The “main extending plane” of the structural unit or element should be understood in particular as a plane parallel to the largest side surface of an imaginary cuboid that just completely surrounds the smallest possible cuboid of the structural unit, and particularly extending through the center of the cuboid. However, it is also conceivable, especially at least in the main extension plane of the photochromic protective element, that the photochromic protective element is configured to be without curvature.

[0008] Alternatively, it is conceivable that the photochromic protective element is configured as a coating or film and is applied, in particular, to a carrier element. The carrier element may be formed, for example, of at least one component or element of a sunscreen device, particularly of a liquid crystal cell, polarizing layer, and / or cellulose triacetate layer of an optical sunscreen filter. The photochromic protective element is preferably abutted against the carrier element in at least one embodiment. Particularly preferably, the photochromic protective element is fastened to the carrier element. It is also conceivable that the carrier element and the photochromic protective element are configured as a single piece. "Single piece" should be understood in particular as at least materially combined, for example by welding, bonding, injection molding, and / or other processes deemed reasonable by those skilled in the art, and / or advantageously formed as a single piece, for example by manufacturing from a casting and / or by manufacturing in a single-component or multi-component injection molding process and advantageously from a single blank. Alternatively or additionally, it is conceivable that the photochromic protective element is contained in an adhesive configured to bond at least two components or elements of the optical sunscreen filter to each other. The photochromic protective element is preferably arranged on the liquid crystal cell. The photochromic protective element preferably abuts against the liquid crystal cell. Particularly preferably, the photochromic protective element is fastened to the liquid crystal cell. It is also conceivable that the photochromic protective element and the liquid crystal cell are a single piece. Alternatively, it is conceivable that at least one additional element of an optical sunscreen filter, particularly at least one additional optical element, preferably at least one additional optical layer, is arranged between the photochromic protective element and the liquid crystal cell. Observed at least along the lateral axis of the liquid crystal cell, the photochromic protective element and the liquid crystal cell preferably at least partially, particularly preferably substantially completely overlap. "At least substantially completely" should be particularly understood as at least 50%, preferably at least 75%, and particularly preferably at least 90% of the total volume and / or total mass of the object. The lateral axis of the liquid crystal cell extends at least substantially perpendicular to the main extension plane of the liquid crystal cell. In use, the liquid crystal cell and / or the photochromic protective element are observed, particularly at least substantially parallel to the lateral axis. The term "substantially perpendicular" should be specifically defined herein as an orientation of a direction relative to a reference direction, wherein the direction and the reference direction form an angle of 90° when viewed, particularly in the projection plane, and the angle has a maximum deviation of particularly less than 8°, advantageously less than 5°, and particularly advantageously less than 2°. The term "substantially parallel" should be specifically understood herein as an orientation of a direction relative to a reference direction, particularly in a plane, wherein the direction has a deviation of particularly less than 8°, advantageously less than 5°, and particularly advantageously less than 2° relative to the reference direction. Preferably, particularly at least along the direction of hypothetical light incidence, and particularly preferably along the direction of hypothetical solar radiation, the photochromic protective element at least partially, preferably at least substantially completely, covers the liquid crystal cell. The photochromic protective element and the liquid crystal cell are particularly part of a layer composite, wherein the photochromic protective element and the liquid crystal cell each constitute a stacked layer.Alternatively, it is conceivable, preferably observed at least along the direction of hypothetical light incidence, particularly along the direction of hypothetical solar radiation, that the liquid crystal cell at least partially, preferably completely, covers the photochromic protective element. Furthermore, it is also conceivable, preferably observed at least along the lateral axis of the liquid crystal cell, that the liquid crystal cell and the photochromic protective element do not overlap. In at least one particularly preferred embodiment, the optical sunscreen filter may have at least two photochromic protective elements. Preferably, each photochromic protective element of the optical sunscreen filter is assigned to one of the user's eyes. However, it is also conceivable in principle that the optical sunscreen filter may have only one photochromic protective element for both of the user's eyes.

[0009] Preferably, in this context, photochromic protective elements, liquid crystal cells, and / or optical sunscreen filters should be understood as optical elements. In this context, the “transmittance” of an optical element should be understood, in particular, as the transmittance of sunlight through the optical element. Preferably, this should be understood, in particular, as the degree to which the visible spectrum of sunlight is absorbed and / or reflected by the optical element. Particularly preferably, this should be understood as hue.

[0010] In this context, "sunscreen device" should be understood in particular as a device configured to protect a user's eyes from the effects of solar radiation, especially interference. Preferably, this should be understood in particular as a device configured to at least reduce the amount of solar radiation. Particularly preferably, the sunscreen device is configured in at least one operating state to darken solar radiation that is particularly interfering to the user's eyes. It is conceivable that the sunscreen device can take on various configurations deemed reasonable by those skilled in the art, such as sun visors, sunglasses, ski goggles, motorcycle goggles, work safety goggles, or the like. "Configured" should be understood in particular as specifically programmed, designed, and / or equipped. An object configured for a specific function should be understood as the object performing and / or executing that specific function in at least one application and / or operating state.

[0011] Furthermore, in this context, "optical sunscreen filter" should be understood in particular as an optical filter, especially forming a protective glass and / or plastic protective glass, specifically for preventing the effects of interfering solar radiation. Preferably, this should be understood in particular as an optical protective filter with automatic dimming. Particularly preferably, the sunscreen filter has at least one liquid crystal plane with switchable transmission. In at least one particularly preferred embodiment, the optical sunscreen filter may have at least two liquid crystal cells. Preferably, each liquid crystal cell of the optical sunscreen filter is allocated to one eye of the user. However, it is also conceivable in principle that the optical sunscreen filter may have only one liquid crystal cell for both eyes of the user. Various liquid crystal cells that are considered reasonable by those skilled in the art are conceivable, such as, in particular, TN liquid crystal cells with twisted nematic technology or liquid crystal cells with 4DFFS technology. However, in principle, it is also conceivable that the liquid crystal cell may be configured in other ways that are deemed reasonable by those skilled in the art, such as STN liquid crystal cells with super-twisted nematic technology, DSTN liquid crystal cells with double super-twisted nematic technology, TSTN liquid crystal cells with triple super-twisted nematic technology, VA liquid crystal cells with vertical alignment technology, especially PVA / MVA liquid crystal cells with patterned vertical alignment technology and / or multi-domain vertical alignment technology, IPS liquid crystal cells with in-plane switching technology, FLCD liquid crystal cells, i.e., ferroelectric liquid crystal cells, and / or TN liquid crystal cells with guest-host technology. Preferably, especially at least in the main extension plane of the liquid crystal cell, the liquid crystal cell is at least partially curved. However, it is also conceivable, especially at least in the main extension plane of the liquid crystal cell, that the liquid crystal cell is configured to be without curvature.

[0012] Preferably, the sun protection device includes at least one sensor unit configured to detect the amount of solar radiation. In this context, "sensor unit" should be understood in particular as a unit configured to record at least one characteristic variable and / or physical property, wherein this recording is preferably active, for example, particularly by generating and emitting electrical measurement signals, and / or passive, for example, particularly by detecting changes in the properties of sensor components. Various sensor units that are considered reasonable by those skilled in the art for use in sun protection devices are conceivable. Preferably, the sensor unit has at least one phototube, especially a photodiode and / or especially a solar cell. Preferably, the phototube is at least configured for optical detection of sunlight and / or artificial light. Especially observed at least along the direction of hypothetical light incidence, particularly preferably along the direction of hypothetical solar radiation, the sensor unit may, for example, be arranged as the outermost or innermost element of the sun protection device, between the liquid crystal unit and the photochromic protective element on the optical sun protection filter, as the frame of the optical sun protection device, and / or at least partially arranged at other or different locations on the optical sun protection filter.

[0013] Preferably, the sun protection device includes at least one control and / or adjustment unit, which is configured to control and / or adjust the transmittance of the liquid crystal cell depending on the amount of solar radiation. In this context, "control and / or adjustment unit" should be understood in particular as a unit having at least one control electronics. "Control electronics" should be understood in particular as a unit having at least one electronic circuit, preferably consisting of a voltage and comparison adjustment module. However, in principle, the control electronics can also be constructed in a more complex manner, for example, particularly by using application-specific integrated circuits (ASICs) and / or microcontroller modules. It is conceivable that the control and / or adjustment unit, in at least one operating state, is configured to control at least one liquid crystal cell of the optical sun protection filter to generate a transmittance profile defined for the user, having at least two different transmittance profiles. In this context, "defined transmittance profile" should be understood in particular as a local profile of the transmittance of the liquid crystal cell visible to the user, especially the carrier.

[0014] It is also proposed that the optical sunscreen filter has a total transmittance, which is formed at least by the transmittance of the liquid crystal cell, as mentioned above, and the transmittance of the photochromic protective element. This advantageously provides protection against particularly high levels of solar radiation. It advantageously ensures the adaptability of the sunscreen device to particularly high levels of solar radiation. Preferably, the optical sunscreen filter has a maximum total transmittance at the maximum transmittance of both the photochromic protective element and the liquid crystal cell. Preferably, the optical sunscreen filter has a minimum total transmittance at the minimum transmittance of both the photochromic protective element and the liquid crystal cell. Preferably, the transmittance of the liquid crystal cell can be adjusted depending on the transmittance of the photochromic protective element. Preferably, the transmittance of the liquid crystal cell can be adjusted by means of a control and / or adjustment unit, depending on the transmittance of the photochromic protective element. Alternatively or additionally, it is also conceivable that the transmittance of the liquid crystal cell can be adjusted independently of the transmittance of the photochromic protective element. In at least one embodiment, alternatively, it is conceivable that the transmittance of the photochromic protective element depends on the transmittance of the liquid crystal cell. The maximum transmittance of the liquid crystal cell is preferably different from, and in particular smaller or larger than, the maximum transmittance of the photochromic protective element. Alternatively, it is also conceivable that the maximum transmittance of the photochromic protective element corresponds to the maximum transmittance of the liquid crystal cell. It is conceivable that the minimum transmittance of the photochromic protective element is different from, and in particular greater than, less than, or equal to, the transmittance of the liquid crystal cell. Preferably, the photochromic protective element and / or the liquid crystal cell are each colorless at maximum transmittance. Alternatively, it is conceivable that the photochromic protective element and / or the liquid crystal cell each have a basic color tone at maximum transmittance.

[0015] It is also proposed that the sun protection device has a particularly curved protective layer arranged as the outermost layer on the optical sun protection filter, wherein a photochromic protective element is applied to or embedded in the protective layer. This advantageously ensures particularly high protection for the carrier of the sun protection device. A particularly robust optical sun protection filter can be advantageously achieved. Preferably, the protective layer forms a carrier element or base carrier for the photochromic protective element. The protective layer is particularly configured as a cellulose triacetate layer. However, it is also conceivable that the protective layer may be formed from other materials deemed reasonable by those skilled in the art. In principle, it is also conceivable that the protective layer may be arranged at other locations on the optical sun protection filter. The protective layer is preferably configured to at least protect the optical sun protection filter from damage, especially from fats, oils, aromatic hydrocarbons, solvents, and / or the like. The protective layer may, for example, be configured to be curved or without curvature. Preferably, especially at least in the main extending plane of the protective layer, the protective layer is configured to be at least partially curved. Preferably, the main extending plane of the protective layer extends at least substantially parallel to the main extending plane of the photochromic protective element in at least one embodiment, particularly in embodiments where the photochromic protective element is applied to the protective layer. Particularly preferably, the curvature of the protective layer is at least substantially the same as the curvature of the photochromic protective element. In this context, "curvature" at a point on the surface where the curvature is not zero should be understood in particular as a deviation increasing by the square of the distance from that point on the surface. Preferably, especially along the direction of hypothetical light incidence, particularly preferably along the direction of hypothetical solar radiation, the protective layer at least partially, preferably completely covers the liquid crystal cell and / or the photochromic protective element. In at least one embodiment, the photochromic protective element is arranged between the protective layer and the liquid crystal cell. However, in at least one other embodiment, it is conceivable that the protective layer is arranged between the photochromic protective element and the liquid crystal cell, wherein, preferably at least along the direction of hypothetical light incidence, particularly along the direction of hypothetical solar radiation, the protective layer is at least partially, preferably completely covered by the photochromic protective element.

[0016] It is also proposed that the optical sunscreen filter has at least one polarizing layer, particularly as previously mentioned, wherein the photochromic protective element is applied to or embedded in the polarizing layer, particularly in at least one embodiment. This advantageously ensures particularly high protection for the carrier of the sunscreen device. Advantageously, the photochromic protective element can be integrated into the sunscreen device in a particularly space-saving manner. The polarizing layer may be configured to be curved or without curvature. Preferably, particularly observed at least in the main extending plane of the polarizing layer, the polarizing layer is configured to be at least partially curved. Preferably, in at least one embodiment, particularly in the embodiment where the photochromic protective element is applied to the polarizing layer, the main extending plane of the polarizing layer extends at least substantially parallel to the main extending plane of the photochromic protective element. Particularly preferably, the curvature of the polarizing layer is at least substantially the same as the curvature of the photochromic protective element. Preferably, particularly observed at least along the direction of hypothetical light incidence, particularly preferably along the direction of hypothetical solar radiation, the polarizing layer at least partially, preferably completely covers the liquid crystal cell and / or the photochromic protective element.

[0017] It is also proposed that the sun protection device, in particular at least in one embodiment, has a sensor unit and a sensor cover, as previously mentioned, wherein the sensor cover at least partially covers the sensor surface of the sensor unit and is at least partially formed of a photochromic material. This can advantageously ensure high accuracy when the optical sun protection filter is adapted to solar radiation, while ensuring particularly high robustness of the sun protection device. In this context, "sensor cover" should be particularly understood as preferably covering, in particular, elements of the sensor unit at least partially along the detection direction of the sensor unit. Preferably, this should be understood as at least partially covering, in particular, elements of the sensor surface of the sensor unit. Preferably, this should be understood as preferably covering, in particular, the sensor unit at least partially along the detection direction of the sensor unit, especially for protection against impacts such as collisions. Particularly preferably, this should be understood as preferably covering, in particular, the sensor unit integrated into the sensor unit so that it is not visible from the outside to an observer. Furthermore, in this context, "sensor surface" of the sensor unit should be particularly understood as the detection surface of the sensor unit. Preferably, this should be understood as a surface such that the sensor unit can detect the amount of light incident, especially solar radiation, on which the sensor unit can detect the amount of light incident. Particularly preferably, this should be understood as the unit surface of the sensor unit. Preferably, the sensor surface is oriented forward, i.e., particularly along the user's imagined viewing direction. Preferably, the sensor surface extends substantially parallel to the front side of the sun protection device. In the context, "the sensor cover at least partially covers the sensor surface of the sensor unit" should be understood in particular as at least 10%, preferably at least 30%, and particularly preferably at least 50% of all surface normals of the sensor surface intersecting the sensor cover in a direction away from the orientation of the sensor unit. Preferably, the sensor cover is formed of a material corresponding to the material of the photochromic protective element. Preferably, the sensor cover is arranged to be spaced apart from the photochromic protective element. Alternatively, it is conceivable that the sensor cover is formed of the photochromic protective element. In particular, the sensor cover has a maximum thickness preferably observed at least along the transverse axis of the sensor cover, which corresponds to the maximum thickness of the photochromic protective element observed at least along the transverse axis of the photochromic protective element. Preferably, the lateral axis of the sensor cover extends at least substantially perpendicular to the main extension plane of the sensor cover. Preferably, the lateral axis of the photochromic protective element extends at least substantially perpendicular to the main extension plane of the photochromic protective element. Alternatively, it is conceivable that the sensor cover is formed of a photochromic material different from the material forming the photochromic protective element. Alternatively, it is conceivable that the maximum thickness of the sensor cover, preferably observed at least along the lateral axis of the sensor cover, is different from the maximum thickness of the photochromic protective element, preferably observed at least along the lateral axis of the photochromic protective element.Preferably, the transmittance of the sensor cover corresponds to the transmittance of the photochromic protective element. Preferably, the dependence of the transmittance of the sensor cover on the amount of solar radiation corresponds to the dependence of the transmittance of the photochromic protective element on the amount of solar radiation.

[0018] It is also proposed that the sun protection device, in particular at least in one embodiment, has a sensor unit, as previously mentioned, which is at least partially arranged between the photochromic protective element and the liquid crystal cell. This advantageously allows for a particularly simple structure of the sun protection device while achieving particularly high accuracy in adapting the optical sun protection filter to the amount of solar radiation. Preferably, the sensor unit is configured to detect the amount of solar radiation after passing through the photochromic protective element. Preferably, at least along the transverse axis of the photochromic protective element, the sensor surface, as previously mentioned, at least partially overlaps with the photochromic protective element. Preferably, at least along the detection direction of the sensor unit, the photochromic protective element at least partially, preferably completely, covers the sensor surface.

[0019] It is also proposed that the sun protection device includes, in particular, the eyeglass frame already mentioned, configured to house an optical sun protection filter. The configuration of the sun protection device can be advantageously realized. A sun protection device that can be reliably positioned on a user's face can be advantageously provided. An eyeglass-like configuration of the sun protection device can be advantageously provided. Preferably, the eyeglass frame has at least one, preferably at least two, storage areas, each provided with a liquid crystal cell and / or photochromic protective element for housing the optical sun protection filter. In this context, "eyeglass frame" should be understood in particular as a frame configured for positioning the sun protection device on a user's face. Preferably, the frame is configured for positioning the sun protection device over the user's nose and ears. Particularly preferably, the eyeglass frame is formed from an eyeglass frame. It is conceivable that a sensor cover, particularly in at least one embodiment, is integrally formed with the eyeglass frame.

[0020] The present invention also relates to a method for operating a sun protection device, particularly the one mentioned above. It is proposed that the transmittance of the liquid crystal cell is adjusted, at least in one method step, depending on the transmittance of the photochromic protective element. This advantageously allows for a particularly precise adaptation of the optical sun protection filter to the amount of solar radiation. Advantageously, it provides a high level of comfort for the user of the sun protection device. Preferably, the transmittance of the liquid crystal cell is adjusted, at least in one method step, depending on the amount of solar radiation. More preferably, the transmittance of the liquid crystal cell is adjusted, at least in one method step, depending on the amount of solar radiation, by means of a control and / or adjustment unit. It is conceivable that the liquid crystal cell of the optical sun protection filter is controlled and / or adjusted to generate a transmittance profile defined for the user. The amount of solar radiation is preferably detected by means of a sensor unit. The amount of solar radiation is preferably detected after passing through the photochromic protective element. Particularly in at least one embodiment, it is also conceivable that the amount of solar radiation is detected after passing through a sensor cover.

[0021] A method for manufacturing, in particular, the aforementioned sun protection device is also proposed. Preferably, in at least one method step, the photochromic protective element and the liquid crystal cell are manufactured as a single piece using injection molding. Preferably, in at least one method step, the photochromic protective element and the protective layer are manufactured as a single piece using injection molding. Alternatively or additionally, in at least one method step, the sensor cover and the eyeglass frame are manufactured as a single piece using injection molding. This allows for the advantageously simple manufacture of the sun protection device.

[0022] In this document, the sun protection device according to the present invention, the method for operating the sun protection device according to the present invention, and / or the method for manufacturing the sun protection device according to the present invention should not be limited to the applications and embodiments described above. In particular, the sun protection device according to the present invention, the method for operating the sun protection device according to the present invention, and / or the method for manufacturing the sun protection device according to the present invention may have a different number of elements, components, and units than those mentioned herein to perform the functional modes described herein. Furthermore, in the case of numerical ranges given in this disclosure, values ​​within the mentioned limits should also be considered public and freely usable. Attached Figure Description

[0023] Further advantages are evident in the following description of the accompanying drawings. Two embodiments of the invention are illustrated in the drawings. The drawings, description, and claims contain numerous combinations of features. Those skilled in the art will consider these features individually and combine them into more meaningful combinations. In the drawings:

[0024] Figure 1 A schematic front view illustrates a sun protection device according to a first embodiment of the present invention and a user wearing the sun protection device according to the present invention;

[0025] Figure 2A partial cross-section of the sun protection device with an optical sun protection filter according to the present invention is shown in a schematic cross-sectional view.

[0026] Figure 3 A schematic flow diagram of a method for operating a sun protection device according to the present invention is shown.

[0027] Figure 4 A schematic flow diagram of a method for manufacturing a sun protection device according to the present invention is shown;

[0028] Figure 5 A schematic front view illustrates a sun protection device according to a second embodiment of the present invention and a user wearing the sun protection device according to the present invention; and

[0029] Figure 6 A schematic cross-sectional view shows a partial cross-section of a sun protection device with an optical sun protection filter according to a second embodiment of the present invention. Detailed Implementation

[0030] Figure 1 A sun protection device 10a is shown. The sun protection device 10a is formed from sunglasses 12a. Alternatively, it is conceivable that the sun protection device 10a may be configured as a sunshade, ski goggles, motorcycle goggles, work safety goggles, etc. The sunglasses 12a automatically darken in response to the amount of solar radiation. However, other designs of the sun protection device 10a that are deemed reasonable by those skilled in the art are also conceivable in principle. The sun protection device 10a is configured in at least one operating state to darken the eyes of the user 36a from solar radiation.

[0031] The sun protection device 10a includes at least one eyeglass frame 26a. The eyeglass frame 26a is formed from an eyeglass rim. The eyeglass frame 26a is substantially made of plastic. However, other materials deemed reasonable by those skilled in the art, such as wood, metal, and / or fiber composites, are also conceivable in principle. The eyeglass frame 26a has a base 38a and two temples movably supported on the base 38a. The base 38a has a nose notch 40a for resting on the nose of a user 36a. The temples are both positioned for resting on the ears of the user 36a. The base 38a consists of two frame parts. However, it is also conceivable in principle that the base 38a could be a single piece. Each of the two frame parts is formed from a housing portion. A first frame part is arranged on the front side, and a second frame part is arranged on the rear side. The frame parts are bonded together, wherein the cavity between the frame parts is sealed. Components disposed within the base 38a are inserted into the frame parts before bonding.

[0032] The sun protection device 10a includes at least one optical sun protection filter 14a. A base 38a is provided for housing the optical sun protection filter 14a. The optical sun protection filter 14a is housed in an eyeglass frame 26a. The light transmittance of the optical sun protection filter 14a is adjustable. The optical sun protection filter 14a is configured to be substantially transparent, wherein the transmittance of the optical sun protection filter 14a is configured to be at least partially electrically variable. The optical sun protection filter 14a has at least one liquid crystal cell 16a. The liquid crystal cell 16a is housed in the eyeglass frame 26a. The base 38a of the eyeglass frame 26a has a recess in which the liquid crystal cell 16a is housed.

[0033] The liquid crystal cell 16a has a liquid crystal plane 50a whose transmittance is switchable during transmission. The liquid crystal cell 16a of the optical sunscreen filter 14a is formed of a plastic liquid crystal cell. The liquid crystal cell 16a consists of multiple layers (see...). Figure 2 In this document, the number of layers is merely exemplary and can be varied in principle. The liquid crystal cell 16a is formed from a TN liquid crystal cell. Therefore, the liquid crystal cell 16a is based on the twisted-nematic technique. However, it is also conceivable in principle that the liquid crystal cell 16a may be designed in other ways that are reasonable to those skilled in the art. The liquid crystal plane 50a is formed from a semi-transparent liquid crystal plane. The liquid crystal plane 50a has a liquid crystal layer 52a. A large number of crystal molecules and spacers are present in the liquid crystal layer 52a. Polyimide layers 54a are arranged on both sides of the liquid crystal layer 52a. The polyimide layers 54a are specifically used for the orientation of the crystal molecules. Electrode layers 56a are arranged on the side of the polyimide layer 54a facing away from the liquid crystal layer 52a. The electrode layers 56a are all formed from transparent indium tin oxide layers. Furthermore, polarizing layers 58a are present on both sides of the liquid crystal plane 50a. The polarizing layers 58a are used for the polarization of incident light. Disk-shaped members 60a are arranged on the side of the polarizing layer 58a facing away from the liquid crystal plane 50a. The disk-shaped members 60a are made of polycarbonate. An anti-reflective layer 62a and a hard layer 64a are applied to the outer side of the disk-shaped members 60a. The liquid crystal cell 16a of the optical sunscreen filter 14a is configured to be bent over the entire extension.

[0034] The optical sunscreen filter 14a includes at least one photochromic protective element 20a. The photochromic protective element 20a is housed in a recess in the eyeglass frame 26a. The photochromic protective element 20a is configured as a coating or film. The photochromic protective element 20a is at least partially composed of silver chloride molecules, organic photochromic molecules, and / or similar substances. The sunscreen device 10a includes at least one protective layer 22a on which the photochromic protective element 20a is applied. Alternatively, it is contemplated that the photochromic protective element 20a is embedded in the protective layer 22a. It is also contemplated in principle that the photochromic protective element 20a is embedded / applied to / on other components or elements of the optical sunscreen filter 14a. Furthermore, it is contemplated that the photochromic protective element 20a is included in an adhesive configured to bond at least two components or elements of the optical sunscreen filter 14a to each other. The protective layer 22a is configured as a cellulose triacetate layer 66a. However, it is also conceivable that the protective layer 22a may be formed of other materials deemed reasonable by those skilled in the art. The protective layer 22a is disposed as the outermost layer on the optical sunscreen filter 14a (see...). Figure 2 In principle, it is also conceivable that the protective layer 22a may be arranged at other locations within the optical sunscreen filter 14a. The protective layer 22a is configured to at least protect the optical sunscreen filter 14a from damage, particularly from greases, oils, aromatic hydrocarbons, solvents, and / or the like. The protective layer 22a is configured to be curved, although in principle it is also conceivable that, at least as observed in the main extending plane of the protective layer 22a, the protective layer 22a is configured to be without curvature. The main extending plane of the protective layer 22a extends at least substantially parallel to the main extending plane of the photochromic protective element 20a. The curvature of the protective layer 22a is at least substantially the same as the curvature of the photochromic protective element 20a. The transmittance of the photochromic protective element 20a varies at least depending on the amount of solar radiation. The photochromic protective element 20a is configured to be transparent and constitutes a photochromic layer. The photochromic protective element 20a is configured to automatically darken as the amount of incident light increases, especially as the amount of solar radiation increases, thereby reducing the transmittance of the photochromic protective element 20a. The photochromic protective element 20a is also configured to brighten as the amount of solar radiation decreases, thereby increasing the transmittance of the photochromic protective element 20a. The photochromic protective element 20a has maximum transmittance after a defined adaptation time when there is no incident activation light on the photochromic protective element 20a. The defined adaptation time is a maximum of 15 minutes. The defined adaptation time depends on the material forming the photochromic protective element 20a.

[0035] Photochromic protection element 20a is arranged on liquid crystal cell 16a (see Figure 2The photochromic protective element 20a abuts against the liquid crystal cell 16a. The photochromic protective element 20a is fastened to the liquid crystal cell 16a. It is also conceivable that the photochromic protective element 20a and the liquid crystal cell 16a are a single piece. Alternatively, it is conceivable that at least one additional element of the optical sunscreen filter 14a, particularly at least one additional optical element, preferably at least one additional optical layer, is arranged between the photochromic protective element 20a and the liquid crystal cell 16a. The photochromic protective element 20a at least substantially completely overlaps the liquid crystal cell 16a, at least as observed along the lateral axis of the liquid crystal cell 16a. The lateral axis of the liquid crystal cell 16a extends at least substantially perpendicular to the main extension plane of the liquid crystal cell 16a. In use, the liquid crystal cell 16a and the photochromic protective element 20a are observed at least substantially parallel to the lateral axis. The photochromic protective element 20a at least substantially completely covers the liquid crystal cell 16a, at least as observed along the direction of hypothetical solar radiation. A portion of a composite material is formed by a photochromic protective element 20a and a liquid crystal cell 16a, wherein the photochromic protective element 20a and the liquid crystal cell 16a each constitute a superimposed layer.

[0036] As observed at least along the direction of hypothetical light incidence, particularly preferably along the direction of hypothetical solar radiation, the protective layer 22a at least partially, preferably completely, covers the liquid crystal cell 16a and the photochromic protective element 20a. The photochromic protective element 20a is disposed between the protective layer 22a and the liquid crystal cell 16a. However, in at least one other embodiment, it is conceivable that the protective layer 22a is disposed between the photochromic protective element 20a and the liquid crystal cell 16a, wherein, as observed at least along the direction of hypothetical light incidence, particularly along the direction of hypothetical solar radiation, the protective layer 22a is at least partially, preferably completely, covered by the photochromic protective element 20a.

[0037] Furthermore, the sun protection device 10a includes a sensor unit 18a. The sensor unit 18a is configured to detect the amount of solar radiation. The sensor unit 18a has a sensor surface 42a configured to detect the amount of solar radiation. The sensor unit 18a has one or more photodiodes formed by phototubes. However, it is also conceivable in principle that the sensor unit 18a may have, for example, a solar cell. Furthermore, it is conceivable, for example, that at least a portion of the sensor unit 18a, such as the individual photodiodes, may be arranged as strips in the end region of the sun protection device 10a.

[0038] Furthermore, the sun protection device 10a has at least one control and / or adjustment unit 44a. The control and / or adjustment unit 44a is configured to control the transmittance of the optical sun protection filter 14a depending on the amount of solar radiation. For this purpose, the control and / or adjustment unit 44a is invisibly connected to the sensor unit 18a. Additionally, the control and / or adjustment unit 44a is invisibly connected to the liquid crystal unit 16a of the optical sun protection filter 14a. The control and / or adjustment unit 44a is electrically connected (not shown) to the electrode layer 56a of the liquid crystal unit 16a. The control and / or adjustment unit 44a is arranged in the eyeglass frame 26a. The control and / or adjustment unit 44a is located above the nasal notch 40a and is arranged in the base frame 38a of the eyeglass frame 26a. The control and / or adjustment unit 44a is integrated into the eyeglass frame 26a. The control and / or adjustment unit 44a is arranged in the storage area of ​​the base frame 38a. The storage area of ​​the base frame 38a is arranged above the nose recess 40a. The storage area of ​​the base frame 38a is formed by a recess. However, other arrangements of the control and / or adjustment unit 44a that are deemed reasonable by those skilled in the art are also conceivable in principle.

[0039] In one operating state, sensor unit 18a is configured to at least partially provide energy to liquid crystal unit 16a for controlling optical sunscreen filter 14a. During operation of sunscreen device 10a, sensor unit 18a is configured to fully provide energy to liquid crystal unit 16a for controlling optical sunscreen filter 14a. During operation of sunscreen device 10a, sensor unit 18a is configured to fully generate the energy required for controlling liquid crystal unit 16a of optical sunscreen filter 14a. Sunscreen device 10a is configured to be battery-free.

[0040] The optical sunscreen filter 14a has a total transmittance formed by at least the transmittance of the liquid crystal cell 16a and the transmittance of the photochromic protective element 20a. The optical sunscreen filter 14a has a maximum total transmittance at both the maximum transmittance of the photochromic protective element 20a and the maximum transmittance of the liquid crystal cell 16a. The transmittance of the liquid crystal cell 16a can be adjusted depending on the transmittance of the photochromic protective element 20a. The transmittance of the liquid crystal cell 16a can be adjusted by means of the control and / or adjustment unit 44a, depending on the transmittance of the photochromic protective element 20a. Alternatively or additionally, it is also conceivable that the transmittance of the liquid crystal cell 16a may be adjusted independently of the transmittance of the photochromic protective element 20a. The maximum transmittance of the liquid crystal cell 16a differs from the maximum transmittance of the photochromic protective element 20a, particularly being smaller or larger. Alternatively, it is also conceivable that the maximum transmittance of the liquid crystal cell 16a corresponds to the maximum transmittance of the photochromic protective element 20a. This similarly applies to the minimum transmittance of the liquid crystal cell 16a and the photochromic protective element 20a. The photochromic protective element 20a and the liquid crystal cell 16a are colorless at maximum transmittance. Alternatively, it is conceivable that the photochromic protective element 20a and / or the liquid crystal cell 16a have a basic color tone at maximum transmittance.

[0041] Sensor unit 18a is at least partially disposed between photochromic protective element 20a and liquid crystal unit 16a. Sensor unit 18a is at least configured to detect the amount of solar radiation after passing through photochromic protective element 20a. As observed at least along the transverse axis of photochromic protective element 20a, sensor surface 42a at least partially overlaps with photochromic protective element 20a. As observed at least along the detection direction of sensor unit 18a, photochromic protective element 20a completely covers sensor surface 42a.

[0042] Figure 3 A flowchart of a method 28a for operating a sunscreen device 10a is shown. In at least one method step 46a, the amount of solar radiation is detected by means of a sensor unit 18a. In at least one method step 30a, the transmittance of a liquid crystal cell 16a is adjusted depending on the amount of solar radiation. The transmittance of the liquid crystal cell 16a is controlled and / or adjusted by means of a control and / or adjustment unit 44a, at least in method step 30a. It is conceivable that the liquid crystal cell 16a is controlled and / or adjusted at least in method step 30a to generate a transmittance profile defined for the user 36a. In at least method step 30a, the transmittance of the liquid crystal cell 16a is adjusted at least depending on the transmittance of a photochromic protective element 20a. The amount of solar radiation is detected at least in method step 46a after passing through at least one photochromic protective element 20a, particularly by means of the sensor unit 18a. Figure 4A method 32a for manufacturing a sun protection device 10a is schematically illustrated. In at least one step 48a of method 32a, a photochromic protective element 20a is present, separate from the liquid crystal cell 16a and / or the protective layer 22a. In at least one additional step 34a, the photochromic protective element 20a is applied to the protective layer 22a, particularly by a coating method, or manufactured as a single piece with the protective layer 22b. It is conceivable that the sensor unit 18a is encapsulated by an optical sun protection filter 14a at least in method step 34a.

[0043] Figure 5 and Figure 6 Another embodiment of the invention is illustrated. The following description and drawings are essentially limited to the differences between embodiments, wherein, for components with the same name, especially for components having the same reference numerals, reference may also be made in principle to the drawings and / or other embodiments, especially... Figures 1 to 4 The description of the embodiments. To distinguish the embodiments, the letter 'a' is placed... Figures 1 to 4 Following the reference numerals in the accompanying drawings of the Chinese embodiments. Figure 5 and Figure 6 In the embodiments described, the letter 'a' is replaced by the letter 'b'. In particular, the method for another embodiment is performed similarly to the previously described method, wherein the difference between these methods may be the differences in technical design between the sun protection device of the other embodiment and the previously described embodiment.

[0044] Figure 5 A sun protection device 10b is shown. The sun protection device 10b is formed from sunglasses 12b. The sun protection device 10b includes at least one eyeglass frame 26b. The sun protection device 10b includes at least one optical sun protection filter 14b. The optical sun protection filter 14b has two liquid crystal cells 16b. The liquid crystal cells 16b are configured to be mirror-symmetrical to each other. The liquid crystal cells 16b are housed within the eyeglass frame 26b. The base 38b of the eyeglass frame 26b has two recesses in which the liquid crystal cells 16b are housed. The liquid crystal cells 16b are arranged on opposite sides of a nasal notch 40b. Each liquid crystal cell 16b is assigned to a corresponding monocular of the user 36b. The optical sun protection filter 14b includes two photochromic protective elements 20b. The photochromic protective elements 20b are arranged similarly to the liquid crystal cells 16b. The transmittance of each photochromic protective element 20b changes at least depending on the amount of solar radiation.

[0045] Photochromic protective elements 20b are all arranged on one of the liquid crystal cells 16b. Observed at least along the lateral axis of the respective liquid crystal cell 16a, each of the photochromic protective elements 20b at least substantially completely overlaps with each of the liquid crystal cells 16b. The lateral axis of the respective liquid crystal cell 16b extends at least substantially perpendicular to the main extending plane of the respective liquid crystal cell 16. Observed at least along the direction of hypothetical solar radiation, each of the photochromic protective elements 20b at least substantially completely covers each of the liquid crystal cells 16b. Observed at least in the main extending plane of the respective photochromic protective elements 20b, each of the photochromic protective elements 20b is at least partially bent.

[0046] A control and / or adjustment unit 44b is disposed in the base 38b of the eyeglass frame 26b, between recesses for the liquid crystal unit 16b. The sun protection device 10b includes at least one sensor unit 18b and a sensor cover 24b. The sensor cover 24b at least partially covers the sensor surface 42b of the sensor unit 18b. The sensor surface 42b extends at least substantially parallel to the end side of the sun protection device 10b. The sensor cover 24b at least substantially completely covers the sensor surface 42b. The sensor unit 18b is disposed in the eyeglass frame 26b. The sensor unit 18b is disposed in the base 38b of the eyeglass frame 26b, above the nasal notch 40b. The sensor unit 18b is integrated into the eyeglass frame 26b. The base 38b of the eyeglass frame 26b has a receiving area above the nasal notch 40b, the receiving area being formed by a recess. The sensor unit 18b is disposed in the receiving area of ​​the base 38b. Sensor cover 24b covers the storage area of ​​the base 38b of the eyeglass frame 26b. Sensor cover 24b is formed of a plate-like cover. Sensor cover 24b is at least partially formed of a photochromic material. Sensor cover 24b is formed of a material corresponding to that of the photochromic protective element 20b. Sensor cover 24b is arranged spaced apart from the photochromic protective element 20b. Sensor cover 24b has a maximum thickness observed at least along its lateral axis, which corresponds to the maximum thickness of the photochromic protective element 20b observed at least along its lateral axis. The lateral axis of sensor cover 24b extends at least substantially perpendicular to the main extension plane of sensor cover 24b. The corresponding lateral axis of photochromic protective element 20b extends at least substantially perpendicular to the main extension plane of the corresponding photochromic protective element 20b. Alternatively, it can be envisioned that the maximum thickness observed in the sensor cover 24b, at least along its lateral axis, differs from the maximum thickness observed in the photochromic protective element 20b, at least along its corresponding lateral axis. The transmittance of the sensor cover 24b corresponds to the transmittance of the photochromic protective element 20b. The dependence of the transmittance of the sensor cover 24b on the amount of solar radiation corresponds to the dependence of the transmittance of the photochromic protective element 20b on the amount of solar radiation.

[0047] The optical sunscreen filter 14b includes at least one polarizing layer 58b (see Figure 6At least one polarizing layer 58b is disposed on each of the liquid crystal cells 16b. Photochromic protection elements 20b are embedded in one of the polarizing layers 58b. Alternatively, it is conceivable that the photochromic protection elements 20b are applied to one of the polarizing layers 58b. At least in the main extending plane of the respective polarizing layer 58b, it is observed that the polarizing layer 58b is configured to be at least partially curved. However, in principle, it is also conceivable that the polarizing layer 58b is configured to be without curvature. Particularly observed at least along the direction of hypothetical light incidence, and particularly preferably along the direction of hypothetical solar radiation, the polarizing layers 58b at least partially, preferably completely, cover the liquid crystal cell 16b.

Claims

1. A sun protection device (10a; 10b) having at least one optical sun protection filter (14a; 14b) with at least one liquid crystal cell (16a; 16b), at least one photochromic protective element (20a; 20b) whose transmissivity changes at least in dependence on the amount of solar radiation, a sensor unit (18a; 18b) which is at least provided for detecting the amount of solar radiation, and a control and / or regulating unit (44a) which is at least provided for controlling and / or regulating the transmissivity of the liquid crystal cell (16a; 16b) in dependence on the amount of solar radiation, characterized in that The sensor unit (18a; 18b) is arranged to detect the amount of solar radiation after passing through the photochromic protective element (20a; 20b), wherein the sunscreen device (10a; 10b) further comprises a sensor cover (24a; 24b) covering a sensor surface (42a; 42b) of the sensor unit (18a; 18b) and having a transmittance corresponding to the transmittance of the photochromic protective element (20a; 20b), and wherein the liquid crystal cell (16a; 16b) does not cover the sensor surface (42a; 42b).

2. The solar protection device (10a; 10b) according to claim 1, characterized in that The optical sunscreen filter (14a; 14b) has a total transmittance formed at least by the transmittance of the liquid crystal cell (16a; 16b) and the transmittance of the photochromic protective element (20a; 20b).

3. The solar protection device (10a; 10b) according to claim 1, characterized in that a curved protective layer (22a) arranged as an outermost layer on the optical sunscreen filter (14a), wherein the photochromic protective element (20a) is applied to or embedded in the protective layer (22a).

4. The solar protection device (10a; 10b) according to claim 1, characterized in that The optical sunscreen filter (14a; 14b) has at least one polarizing layer (58a; 58b), wherein the photochromic protective element (20b) is applied to or embedded in the polarizing layer (58b).

5. The solar protection device (10a; 10b) according to claim 1, characterized in that a sensor unit (18a) arranged at least partially between the photochromic protective element (20a) and the liquid crystal cell (16a).

6. The solar protection device (10a, 10b) according to claim 1, characterized in that a spectacle frame (26a; 26b) arranged for receiving the optical sunscreen filter (14a; 14b).

7. A method (28a; 28b) for operating a sun protection device (10a; 10b) according to any one of the preceding claims, characterized in that, The transmittance of the liquid crystal cell (16a; 16b) is adjusted in at least one method step (30a; 30b) depending at least on the transmittance of the photochromic protective element (20a; 20b).

8. A method (32a; 32b) for manufacturing a sunscreen device (10a; 10b) according to any one of claims 1 to 6.

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