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WO2025114331A1 - Feuille de protection électro-optique et dispositif de protection contre les rayonnements - Google Patents

Feuille de protection électro-optique et dispositif de protection contre les rayonnements Download PDF

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Publication number
WO2025114331A1
WO2025114331A1 PCT/EP2024/083702 EP2024083702W WO2025114331A1 WO 2025114331 A1 WO2025114331 A1 WO 2025114331A1 EP 2024083702 W EP2024083702 W EP 2024083702W WO 2025114331 A1 WO2025114331 A1 WO 2025114331A1
Authority
WO
WIPO (PCT)
Prior art keywords
protection device
protective screen
radiation
transmittance
frame
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/EP2024/083702
Other languages
German (de)
English (en)
Inventor
Marco Koch
Daniel BLÖCHLINGER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Optrel Holding AG
Original Assignee
Optrel Holding AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Optrel Holding AG filed Critical Optrel Holding AG
Publication of WO2025114331A1 publication Critical patent/WO2025114331A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F9/00—Methods or devices for treatment of the eyes; Devices for putting in contact-lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
    • A61F9/04—Eye-masks ; Devices to be worn on the face, not intended for looking through; Eye-pads for sunbathing
    • A61F9/06—Masks, shields or hoods for welders
    • A61F9/065—Masks, shields or hoods for welders use of particular optical filters
    • A61F9/067—Masks, shields or hoods for welders use of particular optical filters with variable transmission
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F9/00—Methods or devices for treatment of the eyes; Devices for putting in contact-lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
    • A61F9/02—Goggles
    • A61F9/022—Use of special optical filters, e.g. multiple layers, filters for protection against laser light or light from nuclear explosions, screens with different filter properties on different parts of the screen; Rotating slit-discs
    • A61F9/023—Use of special optical filters, e.g. multiple layers, filters for protection against laser light or light from nuclear explosions, screens with different filter properties on different parts of the screen; Rotating slit-discs with variable transmission, e.g. photochromic
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/10—Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses
    • G02C7/101—Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses having an electro-optical light valve
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2203/00—Function characteristic
    • G02F2203/11—Function characteristic involving infrared radiation

Definitions

  • the invention relates to an electro-optical protective screen, according to the preamble of claim 1, and to a radiation protection device, in particular a light protection device, with such a protective screen, according to the preamble of claim 9.
  • an electro-optical protective screen that covers at least the field of vision of one eye and comprises at least one liquid crystal element whose transmittance can be controlled by means of control electronics. It is also known to provide radiation sensors and to generate a control signal depending on the intensity of the incident radiation and then to control the transmittance of the protective screen as a function of the control signals from the radiation sensors.
  • the or each liquid crystal cell is preferably attached to a cover screen, which is preferably made of plastic material. At least the contacts for connection to control electronics are arranged on the protective screen.
  • EP 3 258 306 B describes a sun protection device, in particular sunglasses, with at least one optical sun protection filter having at least one liquid crystal cell, and with at least one sensor unit provided for detecting solar radiation.
  • the sun protection device also has a control and/or regulating unit provided for controlling and/or regulating a transmittance of the optical sun protection filter depending on solar radiation.
  • a sensor surface of the at least one sensor unit is at least partially covered by at least one sensor cover, which is at least partially at least substantially opaque to radiation of a visible light spectrum.
  • EP 3 223 067 A also discloses a sun protection device as explained above, comprising at least one control and/or regulating unit, which is provided to control and/or regulate a transmittance of the optical sun protection filter depending on solar radiation.
  • the control and/or regulating unit is provided to control and/or regulate the at least one liquid crystal cell of the optical sun protection filter to generate a defined transmittance profile with at least two different transmittances.
  • WO 2022/038014 A1 describes an embodiment of a sun protection device whose optical sun protection filter has at least one photochromatic protective element in addition to the optical sun protection filter.
  • US Pat. No. 5,552,841 A discloses spectacles with electronically dimmable lenses via liquid crystal cells, which darken depending on the incident radiation. Power is supplied via a film applied to the lenses. Furthermore, a rechargeable battery can be provided, and a dedicated dimming control unit with a manual adjustment knob can be arranged between the solar cell and the lens.
  • a dedicated dimming control unit with a manual adjustment knob can be arranged between the solar cell and the lens.
  • One embodiment of these spectacles provides at least one infrared sensor, the output signal of which is used to control the dimming. The dimming can extend across the height of the lens and, if necessary, can also be manually adjusted.
  • the object of the present invention was to design a device for controllable, but in any case optimized, radiation protection.
  • an electro-optical protective screen for a radiation protection device is characterized in that a partial area of the surface of the cover screen has a permanently lower and preferably constant transmittance than the remaining area of the surface of the cover screen.
  • This partial area is preferably located at the edge of the protective screen, in particular at the upper edge and centrally for the or each protective screen, in order to restrict the field of vision as little as possible and not to obstruct vision.
  • Another possibility would be the area that, when the radiation protection device is in place, is located in the area of the nose, the bridge of the nose, or the root of the nose.
  • This area can, for example, extend vertically from a nose cutout to the upper edge or, in the case of protective screens for spectacle-like embodiments, be located at the central edge area.
  • This provides a location optimally prepared for the positioning or attachment of additional components, which in any case prevents the transmission of radiation, even with a distributed design of these additional components, and ensures optimal shielding. This applies in particular to a completely opaque design of the partial area or to the highest possible blackening.
  • the best possible shading is also provided against radiation, in particular light, which enters from an angular range that deviates significantly from the optical axis of the protective screen and strikes the narrow side of the liquid crystal cell at an angle and is scattered or refracted onto the back of the protective screen into the area to be shielded.
  • the liquid crystal element has a cutout at the location and of essentially the same size as the portion of the cover plate with the lower transmittance. This enables optimal radiation protection while maintaining a low thickness of the protective plate, since all additional components can be arranged in the same plane as the liquid crystal element.
  • a further embodiment of the invention is characterized in that the partial area with a lower transmittance is formed by a layer of a material with a lower transmittance applied to the cover plate.
  • Printing is preferably provided, in particular pad printing.
  • any method that results in a reduction in the transmittance can be used, i.e., any type of coating, coating, or laser treatment.
  • the sub-area with lower transmittance itself consists of at least two sub-areas that have different and preferably constant transmittances and/or different spectral transmission characteristics.
  • the use of areas with constant transmittance results in a very simple embodiment, which avoids additional control effort for the sub-area of the protective screen.
  • Different spectral transmission characteristics enable the optimal design of the sub-area for the positioning of additional components such as sensors, photocells, or the like, whose highest sensitivity may lie in a different part of the spectrum of the incident radiation than the part that is to be shielded.
  • control electronics are also positioned within the lower transmittance section and fixed to the cover panel.
  • This allows for the production of a fully functional protective panel for installation in a wide variety of carrier systems, which is also very thin and therefore versatile.
  • a further alternative embodiment of the invention is characterized in that at least one radiation sensor connected or connectable to the control electronics is positioned within the sub-region with the lower transmittance and is fixed to the cover plate and/or the control electronics.
  • the sensor(s) is/are positioned in those sub-regions that have the highest transmittance.
  • the sensors can be positioned in a sub-region that has the highest transmittance in the spectral range of their highest sensitivity.
  • the radiation sensors preferably have their highest transmittance in the range between 400 and 1100 nm, preferably in the infrared range.
  • the sub-range preferably has its highest transmittance in this wavelength range.
  • a further embodiment of the invention is characterized in that the subregion with lower transmittance is arranged near the upper edge of the cover plate.
  • This arrangement offers the best possibility for attaching the additional components, is optimal for any radiation sensors that control the transmittance of the liquid crystal cell, and is the least disruptive to the field of view through the protective plate.
  • the subregion is also arranged in or near the sagittal plane, as this corresponds to the main viewing direction and any sensors can optimally detect the radiation incident from this direction.
  • an electro-optical radiation protection device comprises a frame and at least one protective screen according to a preceding paragraph, which is secured within this frame or formed integrally therewith.
  • the frame provides mechanical protection for the sensitive edges of the protective screen and also provides stability.
  • additional components and/or retaining arrangements for securing the protective device can be attached to the frame.
  • an electro-optical radiation protection device also comprises a frame and at least one protective screen fastened in this frame or formed integrally therewith, but now additionally comprising control electronics and/or at least one radiation sensor, which are positioned within the partial area of the protective screen with a lower transmittance and are fastened to the frame or integrated therein. Due to the usually high stability of the frame and the higher Freedom in positioning the additional modules allows for the use of larger modules with more functionality, with higher energy consumption and/or energy supply duration or with a higher number of sensors, which also expands the areas of application of the radiation protection device.
  • the radiation sensors of the frame also preferably have their highest sensitivity in the range between 400 and 1100 nm.
  • the highest sensitivity is preferably in the infrared range from 780 nm.
  • the partial area of the protective screen in particular the areas at the location of the sensors, preferably has the highest transmittance in this wavelength range.
  • an embodiment of the invention is preferred in which the radiation sensors attached to the frame and arranged so as to overlap with the protective screen, and preferably also the control electronics arranged in the same way, are arranged adjacent to the upper edge of the cover screen.
  • This arrangement offers the best possibility for attaching the additional components, is optimal for any radiation sensors that control the transmittance of the liquid crystal cell, and is the least disruptive with regard to the field of view through the protective screen.
  • these elements are arranged in or near the sagittal plane of the radiation protection device. This corresponds to the main direction of view, so that any sensors can optimally detect the radiation incident from this direction.
  • An advantageous embodiment of a radiation protection device further provides that the frame is part of a support frame for the or each protective screen, which frame has at least one retaining element for holding the protective device on a person's head, in particular a temple, headband, or the like.
  • the protective device to be designed as glasses, sunglasses, welding goggles, sports or ski goggles, or the like.
  • a protective screen extending across the entire width of the radiation protection device and, in the case of a frame that also encompasses the or each protective screen at the lower edge, this frame also has a nose cutout in the area of the sagittal plane or the central axis of the radiation protection device, which forms an axis of symmetry. This cutout extends from the lower edge and extends over part of the height of the protective screen(s) toward the upper edge of the frame. This results in the typical spectacle contour with the best possible hold and wearing comfort.
  • the frame is part of a helmet with at least one inserted protective visor, which at least partially covers a person's head and can preferably be fixed to the head by means of at least one retaining element. This allows the protective device to be designed as a welding helmet, sports or ski helmet, or the like.
  • a "radiation protection device” is understood to mean, in particular, a device intended to protect a user's eyes from, in particular, disturbing, light or solar radiation.
  • this is understood to mean, in particular, a device intended to at least reduce solar radiation.
  • the radiation protection device is intended, in at least one operating state, to darken, in particular, disturbing, light or solar radiation on the user's eyes.
  • a visor and/or, particularly preferably, protective goggles are a visor and/or, particularly preferably, protective goggles.
  • a "protective screen” should be understood to mean, in particular, a screen made of glass and/or plastic. Its light transmittance is preferably adjustable, possibly with automatic and/or manually adjustable darkening. Particularly preferably, the protective screen has at least one liquid crystal layer with switchable transmission and at least one liquid crystal cell.
  • Various liquid crystal cells that appear appropriate to a person skilled in the art are conceivable, such as, in particular, a TN liquid crystal cell using twisted nematic technology.
  • a radiation protection device for example, photocells, in particular photodiodes and/or solar cells, which are preferably designed at least for optical detection of a limited spectral range of the incident radiation and/or artificial light.
  • the sensor surface is preferably directed forward, i.e., in particular, in the direction of a hypothetical viewing direction of a user.
  • the darkening or change of the transmission of the protective device should be such that at least 50%, preferably at least 70% and particularly preferably at least 90% of a corresponding incident radiation is absorbed and/or reflected, at least in the range of visible light, ie in particular in the wavelength range from 380 nm to 780 nm.
  • Control electronics is understood to mean, in particular, a unit with at least one electronic circuit, which preferably consists of voltage and comparison control modules. In principle, however, the control electronics can also be constructed in a more complex manner, for example by using an application-specific integrated circuit (ASIC) and/or a microcontroller module.
  • ASIC application-specific integrated circuit
  • Fig. 2 the protective screen of Fig. 1 in a view obliquely from above, with the cover screen partially cut away;
  • Fig. 3 shows a section parallel to the transverse plane in the central region of the protective screen of Fig. 1 and Fig. 2;
  • Fig. 4 is a perspective view of an embodiment of a radiation protection device according to the invention in the form of glasses with a protective screen corresponding to Figs. 1 to 3;
  • Fig. 5 shows a section parallel to the sagittal plane through another embodiment of the radiation protection device
  • Fig. 6 shows a section parallel to the sagittal plane through another embodiment of the radiation protection device
  • Fig. 7 is a view of a film with two areas of different transmittance
  • Fig. 8 is a view of a housing made of material with lower transmittance and integrated radiation sensors
  • Fig. 9 shows a cross section through the housing of Fig. 8.
  • Figure 1 shows a protective screen S for an electro-optical radiation protection device, in particular for a protective device against excessive light irradiation, for example, for use as sun protection, as sports or sunglasses, or even for self-darkening optical glasses.
  • the use of the protective screen S in welding helmets or similar protective devices is also possible.
  • the protective screen S covers at least the field of vision of one eye of the wearer and contains or supports the electro-optical element or can itself be designed as an electro-optical element.
  • the protective screen S preferably consists of a cover screen 1 made of a plastic material adapted to the intended use, ideally shatter-resistant, such as polycarbonate, or of glass.
  • the protective screen S or the cover screen 1 can itself be provided with a supporting structure, such as temples, elastic bands, etc., to enable use as a standalone radiation protection device.
  • the protective screen S preferably carries on the inside, ie facing the wearer or on the side to be protected from radiation, at least one liquid crystal element 2 with at least one, preferably with several liquid crystal cells, as can be seen in Fig. 2, in which an upper region of the cover screen 1 is cut away.
  • the liquid crystal element 2 can be arranged on the cover screen 1 in the direction of the line of sight to an object on the front or back thereof.
  • the front side faces the user of the radiation protection device, while the outer side is on the opposite side facing the object to be viewed.
  • the liquid crystal element 2 can also be an integral part of the protective screen S or attached to the outer side of the cover screen 1.
  • the liquid crystal cells of the liquid crystal element 2 are preferably each formed from a plastic liquid crystal cell.
  • the liquid crystal cells can each consist of several layers and can also follow the shape of the cover screen 1 with regard to the flat design as well as with regard to any curved shape.
  • the protective screen S is preferably brightened when the liquid crystal element 2 is activated and darkened when it is deactivated.
  • a very advantageous embodiment provides the liquid crystal cells of the liquid crystal element 2 in a mirror-symmetrical arrangement with respect to the sagittal plane (SE).
  • SE sagittal plane
  • a mirror-symmetrical arrangement of liquid crystal cells with respect to a transverse plane also has advantages, for example, in facilitating a different darkening of the protective device depending on the angle of incidence of the radiation relative to the horizontal.
  • the liquid crystal cells 2 each have a liquid crystal plane whose transmission is switchable. In principle, however, it would also be conceivable for only one liquid crystal cell to be present, which extends, in particular, across the field of vision of both eyes of the user.
  • a partial area 3 of the surface of the cover plate 1 is provided, preferably at the upper edge in the middle, i.e. in the region of the sagittal plane SE (see Fig. 2), which has a permanently lower and preferably constant transmittance, i.e. is darker, than the remaining area of the surface of the cover plate 1, at least in its non-darkened state.
  • the transmittance of the partial area 3 preferably corresponds to the lowest possible transmittance of the liquid crystal element 2 and thus of the protective plate S.
  • Another alternative is a completely opaque or black design of the partial area 3 of the protective plate S that is impermeable to the radiation to be shielded.
  • a coating for example a thin gold layer, can be provided on the cover plate 1 and/or the liquid crystal element 2 for heating the protective plate S in order to prevent or reduce fogging.
  • An additional heating device would also be suitable for this purpose.
  • the dashed line representing the upper edge of the liquid crystal element 2 the latter has a cutout 4 at the location and of essentially the size of the partial region 3 of the cover plate 1 with a lower transmittance.
  • At least one radiation sensor 5 or an arrangement of several radiation sensors 5 and/or the control electronics 6 for the liquid crystal element 2 can be arranged and preferably fixed adjacent to the rear side of the cover plate 1, as shown in Fig. 5.
  • the radiation sensors 5 and/or the control electronics 6 can be encapsulated or enclosed in a potting compound.
  • At least one electrical contact element 7 of the liquid crystal element 2 is guided into the partial region 3 in order to establish electrical contact with the radiation sensors 5 and/or the control electronics 6.
  • contact elements 7 are guided from both sides of the cutout 4 into the free space of the cutout 4 located in front of or behind the partial region 3.
  • no adhesives or the like in particular no optically clear adhesives (OCA) and/or no polarizer, are provided in the contact area.
  • OCA optically clear adhesives
  • the interface between the liquid crystal element 2 and the cover panel 1 can be colored, for example, by a colored coating, colored printing, or a thin colored frame.
  • the cover plate 1 could also be made thinner in each surface area corresponding to the partial area 3 with a lower transmittance than in the remaining area, as shown in Fig. 6. This could make it possible, with a substantially congruent liquid crystal element 2, to form an insertion area between the cover plate 1 and the liquid crystal element 2, into which the control electronics 6 and/or the at least one radiation sensor 5 can be inserted.
  • These elements can be fixed and mechanically protected in the insertion area, preferably by gluing or potting.
  • either at least one of the side walls of the insertion area can be provided with a coating of a material with a lower transmittance, or a support structure for the inserted control electronics 6 and/or the at least one radiation sensor 5 can be provided by a material with a lower transmittance.
  • the partial area 3 with a lower transmittance is preferably formed by a layer 8 of a material with a lower and preferably constant transmittance applied to the cover plate 1. If no cutout is present in the liquid crystal element 2, this layer 8 is located between the cover plate 1 and the liquid crystal element 2, embedded between these components in the form of a sandwich arrangement.
  • a preferred method for applying the layer 8 is to print the cover plate 1 with an opaque or dark printing compound.
  • cover plate 1 and thus typically the entire protective plate S is curved at least about a vertical axis, preferably away from the frontal plane of the protective plate S
  • pad printing is preferably used. This printing method allows the three-dimensional shape of the partial area 3 to be coated precisely and evenly with the material intended for the layer 8. It is also conceivable to apply the layer 8 to the outer front side of the cover plate 1, ie on the side of the protective plate 8 facing the incident radiation. However, all methods can be used which result in a reduction in the degree of transmission, ie any type of coating, coating or laser treatment.
  • the layer 8 for achieving the lower transmittance of the partial area 3 could also be a plastic film that is glued or welded onto the cover plate 3 and/or the liquid crystal element 2, if the latter does not have a cutout 4. This film could also simultaneously serve as a carrier for the control electronics 6 and/or the or each radiation sensor 5, thereby fixing them to the protective plate S.
  • the film could preferably completely enclose the aforementioned components, similar to an envelope, be hermetically sealed, and thus protect the components against contamination, moisture, and mechanical stress.
  • Further alternative possibilities for applying the layer 8 include injection molding of a material with a low transmittance onto the cover plate 1 or co-extrusion of the material of the cover plate 1 and the material for the partial area 3.
  • a preferred embodiment of the partial area 3 with a lower transmittance provides for a further subdivision of this area 3.
  • it can itself consist of at least two sub-areas 3a, 3b, which have different, but both preferably constant, transmittances and consist of layers 8, 9 of different thicknesses and/or different materials.
  • Fig. 7 shows an example of a pre-cut or pre-cut film as layer 8 with lower transmittance and layer 9 with higher transmittance, for application to the cover plate 1 and/or the liquid crystal element 2.
  • the sub-regions 3a and 3b can also have different spectral transmission characteristics. For example, it is possible to enable transmission in the sub-region 3b only for that wavelength range of the radiation in which the radiation sensor 5 located behind it has its highest sensitivity, or to permit transmission to such an extent that this radiation sensor 5 still delivers sufficiently strong signals to the control electronics 6 so that the latter controls the liquid crystal element 2 as desired. It is also possible to keep the sensor surfaces of the radiation sensors 5 completely clear and thus allow any incoming radiation to pass through, or to design the layer 9 with higher transmission or with a range of different spectral transmission characteristics tailored to the spectral sensitivity of the radiation sensors 5.
  • the transmission of layer 8 can be kept significantly lower and even approach zero.
  • radiation sensors 5 are often used whose highest sensitivity is preferably in the infrared range, but in any case in the range between 400 and 1100 nm.
  • a material is selected for the layer 8 or 9 there whose spectral transmission characteristics are optimized for this wavelength range.
  • the material of layers 8 and 9 is preferably selected or designed such that visible light is at least largely blocked.
  • control electronics 6 are positioned within the sub-area 3 with lower transmittance and, in this particular embodiment, are fixed to the cover plate 1, for example, glued or welded thereto, or screwed or fastened by press or snap connections.
  • control electronics 6 are typically located in the lower sub-area 3a with a very low transmittance.
  • the radiation sensors 5 are also preferably fixed to the cover plate 1 in this embodiment of the protective plate S, whereby the same connection methods can be used.
  • Fig. 8 and Fig. 9 show a further embodiment for creating a partial area with a lower transmittance in the protective pane S.
  • the control electronics 6 and/or the radiation sensors 5 are accommodated in a housing 13 which is made of a material with a low transmittance.
  • This complete assembly comprising the housing 13, the control electronics 6 and at least one radiation sensor 5 can be fixed to the cover pane 1 or the liquid crystal element 2 by any desired connection method, preferably also replaceably, and thereby forms the partial area 3 with a lower transmittance of the protective pane S.
  • the housing 13 can also be inserted into the cutout 4 of the liquid crystal element 2 or into a slit-like or trough-like receiving space between the cover pane 1 and the liquid crystal element 2 and fixed there, now also for example by means of a potting material.
  • the housing 13 can be made of a material that ensures the lowest possible transmission for the radiation to be shielded, but can have a better, higher transmittance in the spectral sensitivity range of the radiation sensors 5. Such an effect can also be achieved by at least one housing section 14 made of material with a higher transmittance, which is arranged in front of the sensors 5.
  • the housing 13 can consist of several parts that are joined together using suitable connection methods, but it can also be formed in one piece, with a hinged or elastically deflectable cover that can be locked, for example, by means of a snap closure 15, as shown in Fig. 9.
  • At least one electrical contact element 7 of the liquid crystal element 2 is guided into the partial area 3 in order to establish electrical contact with the radiation sensors 5 and/or the control electronics 6.
  • Contact elements 7 are preferably guided from both sides of the cutout 4 into the free space of the cutout 4 located in front of or behind the partial area 3. Otherwise, no adhesives or the like, in particular no optically clear adhesives (OCA) and/or no polarizer, are provided in the contact area.
  • OCA optically clear adhesives
  • the interface between the liquid crystal element 2 and the The front lens 1 can be colored, for example by a color coating, color printing or a thin colored frame.
  • the cover plate 1 could also be made thinner in each surface area corresponding to the partial area 3 with a lower transmittance than in the remaining area, as shown in Fig. 6. This could make it possible, with a substantially congruent liquid crystal element 2, to form an insertion area between the cover plate 1 and the liquid crystal element 2, into which the control electronics 6 and/or the at least one radiation sensor 5 can be inserted.
  • These elements can be fixed and mechanically protected in the insertion area, preferably by gluing or potting.
  • either at least one of the side walls of the insertion area can be provided with a coating of a material with a lower transmittance, or a support structure for the inserted control electronics 6 and/or the at least one radiation sensor 5 can be provided by a material with a lower transmittance.
  • Figs. 4, 5, and 6 show an exemplary embodiment of a radiation protection device according to the invention in the form of sunglasses.
  • the protective screen S is inserted into a frame 10 and fixed therein in a possibly replaceable manner. This is particularly easy to achieve with a frame 10 that is open at the bottom and is connected or connectable to the protective screen S only in the area of the upper edge of the latter, at most up to the lateral area of the frame 10.
  • the frame 10 can also hold the protective screen S only at the lower edge, surround it on all sides, or only in certain sections of the peripheral edge.
  • the frame 10 is an integral component of the protective screen S, in particular of the cover screen 1.
  • the frame 10 is part of a complete support frame, which also has the typical temples 11 of glasses, a headband that preferably elastically surrounds the head, or other conventional fastening means.
  • the embodiment with a frame 10 around the protective screen S also allows a construction of the radiation protection device in which the protective screen S only consists of the cover plate 1 with the partial area 3 with lower transmittance and the contacts 7 for Control electronics 6 and/or radiation sensors 5.
  • the control electronics 6 and the radiation sensors 5 are attached to the frame 10 directly or indirectly via support structures or are integrated therein, but are arranged such that they are positioned within the partial area 3 with a lower transmittance of the protective screen S.
  • the radiation sensors 5 and preferably also the control electronics 6 are also arranged in a frame 10 adjacent to the upper edge of the cover screen 1 and preferably in or near the sagittal plane of the radiation protection device (see Fig. 2).
  • These radiation sensors 5 also preferably have their highest sensitivity in the infrared range from 780 nm or at least in the range between 400 and 1100 nm. If sub-regions 3b are present with a higher transmittance or different spectral transmission characteristic than that of the sub-region 3 in general or the sub-region 3a, an aligned arrangement of the radiation sensor 5 and the sub-region 3b is ensured.
  • an embodiment of the protective screen S and thus also of the radiation protection device can be designed such that the protective screen S extends over the entire width of the radiation protection device.
  • the protective screen S and, in the case of a frame 10 also surrounding the or each protective screen S at the lower edge - as in Fig. 4 - this frame also preferably has, in the region of the sagittal plane SE or the central axis of the radiation protection device forming an axis of symmetry, a nose recess 12 starting from the lower edge and extending over part of the height of the protective screen S in the direction of the upper edge of the frame 10.
  • each eye is assigned its own protective screen S.
  • the liquid crystal elements 2, both protective screens S are controlled by only one common control electronics 6.
  • completely independent protective screens S, each with its own radiation sensors 5 and its own control electronics 6, are also conceivable, the transmittance of which can then be controlled separately and independently of one another. Even with such protective screens S, Partial areas 3 with lower transmittance or other spectral transmission characteristics are provided.
  • the frame 10 is part of a helmet or a visor with at least one inserted protective screen S.
  • the helmet or visor at least partially covers the head, at least in the facial area, and can preferably be fixed to the head by means of at least one holding element or support frame.
  • the visor can be pivotably or otherwise movably connected to a helmet or support frame.
  • the or each protective screen S can have at least two, but preferably three radiation sensors 5, preferably arranged in a line next to one another along or parallel to a transverse axis of the protective screen S or parallel to the width of the protective screen S.
  • the planes of the sensor surfaces of the radiation sensors 5 can enclose an obtuse angle with one another.
  • Each of the radiation sensors 5 generates a signal as a function of the intensity of the incident radiation, from which a control signal for the liquid crystal element 2 is determined in the control electronics 6 in order to control its transmittance and thus also the transmittance of the protective screen S or the radiation protection device as a whole as a function of the radiation intensity.
  • the control electronics 6 is preferably designed to determine an average value from the signals of all radiation sensors 5 and to control the transmittance of the liquid crystal element 2 as a function of this average value. This also attracts obliquely incident radiation in order to form an average value of the intensity of the radiation striking the protective screen S. As an alternative to the design of the control electronics 6 just described, it could also be designed to control the transmittance of the liquid crystal cell 2 depending on the respective highest control signal of all calibration sensors 5.
  • the radiation sensors 5 can be conventional sensors of suitable design or implemented as photodiodes, preferably operated in photovoltaic mode.
  • the output voltage or current can be fed into the control electronics 6 as a control signal, as well as used to supply power to the control electronics 6 and/or the liquid crystal element 2.
  • Additional photodiodes and/or photovoltaic elements could be provided to support or completely take over the energy supply for the control electronics 6 and/or for the liquid crystal cells 2.
  • Photovoltaic elements such as typical solar cells, could also be used as radiation sensors 5 if they can emit a signal proportional to the incident radiation intensity to the control electronics 6.
  • contacting can be achieved by printed conductors and contact elements.
  • the control electronics 6 can be expanded with various modules and functionalities, particularly if the space available is relatively large due to positioning in the frame 10 or in a support frame.
  • modules for receiving and displaying various information could be integrated, for example, distances to objects in the field of view, the speed of the wearer of the protective device, but also general information from weather services, warning services, or the like.
  • Such data can also come from a mobile phone transmitted via Bluetooth or a similar protocol if the electro-optical protective device is equipped with a corresponding data interface.
  • a mobile radio module could also be integrated into the control electronics 6 or frame 10 or be present in the support frame or in the protective screen S.
  • control of the liquid crystal element 2 or the retrieval of certain functions of the control electronics 6 can also be carried out by actuating elements on the protective glass S or on the frame 10 or on the support frame, at least in a supplementary or bridging manner.

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  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Biomedical Technology (AREA)
  • Engineering & Computer Science (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Optics & Photonics (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • General Physics & Mathematics (AREA)
  • Liquid Crystal (AREA)

Abstract

L'invention concerne une feuille de protection électro-optique (S) pour un dispositif de protection contre les rayonnements, en particulier un dispositif de protection contre la lumière, comprenant une feuille orientée vers l'avant (1), de préférence en matière plastique, et au moins un élément à cristaux liquides (2) ayant un degré de transmission régulable sur au moins un côté de la feuille orientée vers l'avant (1). Au moins un système électronique de commande (6) pour l'au moins un élément à cristaux liquides (2) est également prévu, ou au moins un contact (7) est présent pour une connexion à un tel système électronique de commande (6). Une partie (3) de la surface de la feuille orientée vers l'avant (1) au bord de la feuille orientée vers l'avant (1) présente un degré de transmission qui est de préférence constant, et est en permanence inférieur à celui du reste de la surface de la feuille orientée vers l'avant (1).
PCT/EP2024/083702 2023-11-27 2024-11-27 Feuille de protection électro-optique et dispositif de protection contre les rayonnements Pending WO2025114331A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA50956/2023 2023-11-27
AT509562023 2023-11-27

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Publication Number Publication Date
WO2025114331A1 true WO2025114331A1 (fr) 2025-06-05

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5552841A (en) 1993-10-06 1996-09-03 A B G S.R.L. Liquid crystal eyeglasses
US20150272260A1 (en) * 2012-11-13 2015-10-01 Alphamicron Incorporated Attachable optical element arrangements and methods
EP3223067A1 (fr) 2016-03-23 2017-09-27 Optrel Ag Dispositif de protection solaire
US20170357108A1 (en) * 2016-06-14 2017-12-14 Optrel Ag Sun protection device
CN110231718A (zh) * 2019-02-13 2019-09-13 董达智 嵌入式安装电子部件的力学光学双重防护眼镜片的护目镜
WO2021144684A1 (fr) * 2020-01-14 2021-07-22 Out Of S.R.L. Masque oculaire de protection pour la pratique des sports d'hiver
WO2022038014A1 (fr) 2020-08-21 2022-02-24 Optrel Holding AG Dispositif à écran solaire
WO2023047271A1 (fr) * 2021-09-21 2023-03-30 Out Of S.R.L. Lunettes de protection à cristaux liquides de type gh et cadre structural de recouvrement

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5552841A (en) 1993-10-06 1996-09-03 A B G S.R.L. Liquid crystal eyeglasses
US20150272260A1 (en) * 2012-11-13 2015-10-01 Alphamicron Incorporated Attachable optical element arrangements and methods
EP3223067A1 (fr) 2016-03-23 2017-09-27 Optrel Ag Dispositif de protection solaire
US20170357108A1 (en) * 2016-06-14 2017-12-14 Optrel Ag Sun protection device
EP3258306A1 (fr) 2016-06-14 2017-12-20 Optrel Ag Dispositif de protection solaire
CN110231718A (zh) * 2019-02-13 2019-09-13 董达智 嵌入式安装电子部件的力学光学双重防护眼镜片的护目镜
WO2021144684A1 (fr) * 2020-01-14 2021-07-22 Out Of S.R.L. Masque oculaire de protection pour la pratique des sports d'hiver
WO2022038014A1 (fr) 2020-08-21 2022-02-24 Optrel Holding AG Dispositif à écran solaire
WO2023047271A1 (fr) * 2021-09-21 2023-03-30 Out Of S.R.L. Lunettes de protection à cristaux liquides de type gh et cadre structural de recouvrement

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