WO2024256243A1 - Verfahren zur herstellung einer verbundscheibe für ein holographisches head-up-display, sowie verbundscheibe - Google Patents
Verfahren zur herstellung einer verbundscheibe für ein holographisches head-up-display, sowie verbundscheibe Download PDFInfo
- Publication number
- WO2024256243A1 WO2024256243A1 PCT/EP2024/065500 EP2024065500W WO2024256243A1 WO 2024256243 A1 WO2024256243 A1 WO 2024256243A1 EP 2024065500 W EP2024065500 W EP 2024065500W WO 2024256243 A1 WO2024256243 A1 WO 2024256243A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pane
- stacking sequence
- composite pane
- recording medium
- holographic recording
- 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.)
- Ceased
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Classifications
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/402—Coloured
- B32B2307/4023—Coloured on the layer surface, e.g. ink
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/41—Opaque
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/412—Transparent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/416—Reflective
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/732—Dimensional properties
- B32B2307/737—Dimensions, e.g. volume or area
- B32B2307/7375—Linear, e.g. length, distance or width
- B32B2307/7376—Thickness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2457/00—Electrical equipment
- B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2605/00—Vehicles
- B32B2605/08—Cars
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K2360/00—Indexing scheme associated with groups B60K35/00 or B60K37/00 relating to details of instruments or dashboards
- B60K2360/20—Optical features of instruments
- B60K2360/23—Optical features of instruments using reflectors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K2360/00—Indexing scheme associated with groups B60K35/00 or B60K37/00 relating to details of instruments or dashboards
- B60K2360/20—Optical features of instruments
- B60K2360/29—Holographic features
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B27/0103—Head-up displays characterised by optical features comprising holographic elements
- G02B2027/0105—Holograms with particular structures
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B2027/0192—Supplementary details
- G02B2027/0194—Supplementary details with combiner of laminated type, for optical or mechanical aspects
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/22—Processes or apparatus for obtaining an optical image from holograms
- G03H1/2249—Holobject properties
- G03H2001/2284—Superimposing the holobject with other visual information
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H2250/00—Laminate comprising a hologram layer
- G03H2250/37—Enclosing the photosensitive material
Definitions
- the present invention is in the technical field of pane production and relates to a method for producing a composite pane for a holographic head-up display, as well as a composite pane for a holographic head-up display produced by the method according to the invention.
- HUDs head-up displays
- a projector typically in the dashboard area
- images are projected onto the HUD area of the windshield, reflected there and perceived by the driver as a virtual image (as seen from the driver's perspective) behind the windshield.
- Head-up displays can therefore make a significant contribution to increasing road safety.
- hologram elements into the windshield, in which there is no light reflection, but rather a diffraction of incident light according to the recorded hologram.
- hologram elements advantageously contain a hologram that was created by holographic exposure of a holographic recording medium in such a way that the function of an optical mirror for a specific wavelength and angle of incidence of the incident light is implemented.
- This mirror function of the hologram allows any information from an imaging projector to be projected into an image plane that is visible to the viewer in a specific spatial area, commonly referred to as an "eye box". Since the holographic mirror function is actually based on the diffraction of light, the optical law that applies to reflection, according to which the angle of incidence corresponds to the angle of reflection, is not applicable. This has the advantage that the eye box can also be positioned outside of areas in which secondary images (ghost images) caused by reflection on the composite pane are visible. In addition, there is greater variability for the Installation situation of windshields, which can be installed particularly flat in a vehicle.
- Hologram elements with holograms with a mirror function that are laminated between the individual panes of a windshield can be used for head-up displays.
- Holograms with a mirror function which are also referred to as “reflection holograms”
- the holograms of a holographic head-up display are usually designed in such a way that they only respond to light in a narrow wavelength and angle range that is emitted by an internally arranged projector.
- Windshields generally consist of two panes, typically made of glass, which are firmly connected (laminated) to one another via an intermediate layer containing at least one region made of a thermoplastic. Holographic optical elements with a mirror function are typically provided in film form and laminated into the composite pane.
- a known procedure is to cover a substrate film made of a polymer with a holographic recording medium (photopolymer) applied to one surface with a cover film made of a polymer, so that the holographic recording medium between the two polymer films is well protected from mechanical and chemical influences.
- the stack of the two polymer films with holographic recording medium is laminated between the two glass panes of the windshield, with a connecting layer made of a thermoplastic typically being arranged on both sides of the stack of polymer films.
- the two polymer films with the recording medium in between are therefore embedded in thermoplastic.
- CN 114660695 A discloses a composite pane with a holographic film laminated between two thermoplastic films. Also shown is the arrangement of base layers on both sides of the holographic film.
- the object of the present invention is to avoid the disadvantages mentioned above and to provide an improved composite pane for a projection arrangement with a HUD area, which can be manufactured in industrial series production in a time- and cost-efficient manner and with high optical quality. In particular, this should be possible in a simple manner with already existing and possibly only slightly modified production systems.
- a method for producing a composite pane, preferably a laminated glass pane, for a projection arrangement with a holographic HUD region is shown.
- HUD area refers to an area of the composite pane that is intended to be illuminated with the light (image) of a projector in a projection arrangement so that a head-up display image can be displayed in the HUD area.
- the HUD area is therefore arranged in an area of the composite pane that is at least partially transparent with a light transmission factor (according to ISO 9050:2003) of preferably at least 50%, particularly preferably at least 70%. If the composite pane is, for example, a windshield in a car, the HUD area is an area through which a viewer (for example the driver) can look at the road.
- the composite pane has a peripheral edge, which particularly preferably comprises an upper edge and a lower edge, as well as two side edges running between them with a left and a right side edge (when looking at the composite pane from the inside).
- the upper edge refers to the edge that is intended to point upwards in the installation position.
- the lower edge refers to the edge that is intended to point downwards in the installation position.
- the upper edge is often also referred to as the roof edge and the lower edge as the motor edge.
- the composite pane can have any suitable geometric shape and/or curvature.
- the composite pane comprises an outer pane and an inner pane, which are firmly connected to one another by an intermediate layer containing two or more connecting layers made of a thermoplastic.
- the intermediate layer can be divided into various connecting layers made of a thermoplastic, whereby the connecting layers made of a thermoplastic can also be connected (fused) to one another. Even in the case of an intermediate layer made of several (fused) connecting layers, areas of the intermediate layer that correspond to the respective connecting layers can be individualized, at least in theory.
- the intermediate layer preferably extends over the entire surface of the composite pane, i.e. is arranged flatly between the outer pane and the inner pane.
- a holographic recording medium is embedded in the intermediate layer and in thermoplastic (preferably completely), which is located between a substrate film made of a polymer material and a cover film made of a polymer material.
- the polymer material(s) of the substrate and cover film can in principle be chosen arbitrarily, provided that they can be thermally welded (i.e. by heating above a (highest or respective) melting temperature) so that the substrate and cover film or areas thereof can be firmly connected to one another by the action of externally supplied heat. In other words, the polymer material(s) of the substrate and cover film can be firmly connected to one another by thermal melting and subsequent cooling.
- the polymer material(s) of the substrate film and cover film are preferably different from the thermoplastic of the connecting layers.
- At least one holographically active zone with a mirror function for at least one wavelength and at least one angle of incidence realized by light diffraction can be generated by holographic exposure (holographic recording), which typically comprises a light beam and a reference beam.
- the holographically active zone corresponds to the area of the recording medium that has been provided with a hologram by holographic exposure.
- the mirror function of the hologram is implemented in the hologram for a narrow wavelength range and a small range of the angle of incidence of the incident light.
- the holographic recording medium is a material that is suitable for recording a hologram with a mirror function. Suitable materials for this are known to those skilled in the art.
- the holographic recording medium typically contains or consists of a photopolymer.
- the holographic recording medium can have a single holographically active zone (i.e. a single hologram) in one area of the holographic recording medium or several holographically active zones (i.e. several holograms) in different areas of the holographic recording medium.
- the holographic recording medium can be provided with at least one hologram with a mirror function, i.e. with at least one holographically active zone, before or after integration into the composite pane by holographic exposure.
- the holographic exposure of the holographic recording medium to produce at least one hologram with a mirror function takes place before the holographic recording medium is integrated into the composite pane.
- the at least one holographically active zone contains a hologram (i.e. holographic recording) and can also be referred to as a hologram element.
- the method according to the invention for producing a composite pane for a projection arrangement with a HUD area comprises the following steps, which are carried out, for example, in the order given according to alphabetical sequence, whereby the sequence of the steps can also be different or steps can be carried out simultaneously:
- a first stacking sequence containing a substrate film made of a thermally weldable polymer material (polymer film), wherein a holographic recording medium is arranged flatly on a surface of the substrate film, wherein at least one holographically active zone with a mirror function for at least one wavelength and at least one angle of incidence can be produced or has already been produced in the holographic recording medium by holographic exposure, a cover film made of a thermally weldable polymer material (polymer film) arranged on the substrate film, wherein the holographic recording medium is arranged between the substrate film and the cover film.
- the substrate film and cover film are bonded to one another.
- the substrate film and cover film are bonded to one another only in an area in which there is no holographic recording medium. In other words, in the thermally welded connection area, there is no holographically active recording medium between the substrate film and cover film.
- the predetermined size results from the respective conditions of the composite pane and can be selected according to the circumstances.
- step b) for thermally welding the substrate and cover film of the first stacking sequence takes place before or at the same time as step c) for cutting the first stacking sequence with thermally welded connection area to a predetermined size.
- the thermal welding of the substrate and cover film in the connection area surrounding the holographic recording medium or the at least one holographically active zone can advantageously prevent optical impairment of the composite pane in the area of the holographic recording medium caused by delamination.
- the mechanical action when cutting the first stacking sequence will cause micro-mechanical damage to the substrate and cover film, which causes delamination and subsequently produces undesirable optical defects in the composite pane.
- the present invention thus advantageously shows a new way of easily avoiding optical defects caused by delamination in the area of the substrate and cover film. This is a great advantage of the present invention.
- the first stacking sequence is cut to a predetermined size before the thermal welding of the substrate and cover film of the first stacking sequence, i.e. step c) is carried out before step b).
- step c the first stacking sequence is cut to a predetermined size before the thermal welding of the substrate and cover film of the first stacking sequence, i.e. step c) is carried out before step b).
- the cutting of the first stacking sequence to a predetermined size and the thermal welding of the substrate and cover film of the first stacking sequence are carried out simultaneously, ie steps b) and c) are carried out simultaneously.
- a hot cutting tool such as a hot cutting knife.
- the first stacking sequence is not only cut, but during cutting, the substrate and cover film are cut by the hot cutting tool, particularly in the Cutting area (cutting edges) thermally welded.
- This design is particularly preferred due to its time and cost efficiency. Optical defects due to delamination of the composite pane can be reliably and safely avoided.
- the cutting of the first stacking sequence to a predetermined size takes place after the thermal welding of the substrate and cover film of the first stacking sequence, wherein the cutting of the first stacking sequence takes place within the connection region or on a side of the connection region that faces away from the at least one holographically active zone.
- the two polymer films of the first stacking sequence are thermally welded in a connecting region that surrounds the holographic recording medium or the at least one holographically active zone (preferably completely).
- the connecting region preferably surrounds the holographic recording medium or the at least one holographically active zone completely.
- the holographic recording medium or the at least one holographically active zone is preferably completely embedded between the substrate film and the cover film and is surrounded exclusively by material from the substrate film and cover film.
- Common machines and methods used in the series production of composite panes can be used particularly advantageously for this purpose (e.g. plotters for introducing wires into PVB layers by heating).
- the surrounding connecting region is particularly advantageously a surrounding edge region of the first stacking sequence (or of the substrate and cover film).
- the substrate and cover film contain or consist of polyethylene terephthalate (PET), polyethylene (PE), polymethyl methacrylate (PMMA), polycarbonate (PC), polyamide (PA), polyvinyl chloride (PVC) and/or cellulose triacetate (TAC), preferably polycarbonate (PC).
- PET polyethylene terephthalate
- PE polyethylene
- PMMA polymethyl methacrylate
- PC polycarbonate
- PA polyamide
- PVC polyvinyl chloride
- TAC cellulose triacetate
- PC polycarbonate
- the polymer materials of the substrate and cover film can be the same or different from one another. These materials can be bonded together by thermal welding. For example, the thickness of a polymer film is between 20 and 100 pm. The size of the substrate and cover film depends on the specific conditions of the composite pane and must be selected according to the circumstances.
- the size and shape of the at least one holographic-active zone are independent of the size and shape of the holographic recording medium, provided that the holographic-active zone is formed in the holographic recording medium and therefore cannot be larger than the holographic recording medium.
- an area occupied by the holographic-active zone is smaller than an area occupied by the holographic recording medium on the substrate film. This has the particular advantage that the holographic-active zone, which defines the HUD area, can have significantly smaller dimensions than the holographic recording medium.
- the holographic-active zone can have usual dimensions for a HUD area, such as 210 x 210 mm for a HUD area in the "extended reality” application, also referred to as "augmented reality", or 50 x 150 mm for a smaller field of view in which only a small amount of information is to be displayed.
- a HUD area such as 210 x 210 mm for a HUD area in the "extended reality” application, also referred to as "augmented reality", or 50 x 150 mm for a smaller field of view in which only a small amount of information is to be displayed.
- the holographic recording medium can also completely cover an optically transparent see-through area of the composite pane (e.g. windshield).
- This has the advantage that the edge of the holographic recording medium lies outside the see-through area of the composite pane, so that an edge of the recording medium that may be visually disturbing is avoided.
- the holographic recording medium completely covers an optically transparent see-through area of the composite pane.
- the size of the two polymer films of the substrate and cover film is accordingly, for example, so large that an optically transparent see-through area of the composite pane is completely covered.
- the size and shape of the holographic recording medium are independent of the size and shape of the substrate film or cover film.
- the holographic recording medium completely covers the substrate film except for a peripheral edge zone which is thermally welded into the composite pane in the connection region.
- the size and shape of the holographic recording medium are substantially smaller than the size and shape of the substrate film or cover film.
- the substrate and cover foils are of the same size, but their sizes may also be different from each other as long as it is ensured that the holographic recording medium (as viewed vertically through the substrate foil) is completely covered by the cover foil.
- a further connecting layer made of a thermoplastic is provided, typically in film form, which is provided with an internal cutout.
- the first stacking sequence is arranged within the cutout of the further connecting layer so that it surrounds the first stacking sequence in the manner of a paspartout (frame).
- the further connecting layer which surrounds the first stacking sequence in the form of a frame, can at least largely prevent the effect of mechanical forces on the first stacking sequence when laminating the second stacking sequence to produce the composite pane.
- At least one connecting layer of the at least two connecting layers made of a thermoplastic material is arranged between the first stacking sequence and the inner pane and at least one further connecting layer of the at least two connecting layers made of a thermoplastic material is arranged between the first stacking sequence and the outer pane.
- a minimum thickness of the connecting layer of the at least two connecting layers, which is located between the first stacking sequence and the inner pane is less than a minimum thickness of a further connecting layer of the at least two connecting layers, which is located between the first stacking sequence and the outer pane.
- the at least one connecting layer between the first stacking sequence and the inner pane is thinner than the at least one further connecting layer between the first stacking sequence and the outer pane.
- the at least one connecting layer between the first stacking sequence and the inner pane has a minimum thickness in the range from 0.05 mm to less than 0.38 mm and the at least one connecting layer between the first stacking sequence and the Outer pane has a minimum thickness in the range of 0.38 mm to 1 mm.
- the at least one connecting layer between the first stacking sequence and the outer pane can have a standard thickness of 0.38 mm or 0.76 mm, which is common in the automotive sector for windshields.
- connecting layers are basically flat and extended.
- the term "thickness” refers to the dimension of a connecting layer perpendicular to the flat extension or area of the connecting layer.
- the thickness is considered to be the smallest or smallest thickness (i.e. dimension) perpendicular to the surface of the connecting layer, which applies in particular to wedge-shaped connecting layers whose thickness is variable. It goes without saying that a connecting layer can always have the same or constant thickness.
- the invention further extends to a composite pane produced by the method according to the invention for a projection arrangement with a HUD area (H).
- the composite pane comprises an inner pane and an outer pane, which are firmly connected to one another by an intermediate layer containing at least two connecting layers made of a thermoplastic.
- a first stacking sequence which comprises a substrate film made of polymer material with a holographic recording medium applied thereto and a cover film made of a polymer material which is arranged on the substrate film.
- the holographic recording medium is arranged between the substrate film and the cover film.
- At least one holographically active zone with a mirror function can be produced or is produced in the holographic recording medium by holographic exposure, the HUD region (H) being formed by the at least one holographically active zone.
- the substrate film and the cover film are integrally connected to one another by thermal welding in a connecting region which (preferably) completely surrounds the holographically active zone.
- the composite pane is designed to separate the interior from the outside environment in an opening in a surrounding structure, e.g. in a window opening in a vehicle.
- the outer pane is arranged closer to the outside environment than the inner pane.
- the two panes each have an outside surface and an inside surface and a circumferential side edge running between them.
- the term "outside surface” refers to the main surface that is intended to face the outside environment when installed.
- inside surface refers to the main surface that is intended to face the interior when installed.
- the interior surface of the outer pane and the outside surface of the inner pane face each other and are connected to each other by the intermediate layer.
- side I for the outside surface of the outer pane, "side II” for the inside surface of the outer pane, "side III” for the outside surface of the inner pane and “side IV” for the inside surface of the inner pane are also common.
- the two panes of the composite pane can in principle have any chemical composition known to the person skilled in the art.
- the two panes preferably contain or consist of glass, particularly preferably flat glass, float glass, quartz glass, borosilicate glass, soda-lime glass or aluminosilicate glass. It is also conceivable that the two panes contain or consist of a clear plastic, preferably a rigid clear plastic, in particular polyethylene, polypropylene, polycarbonate, polymethyl methacrylate, polystyrene, polyamide, polyester, polyvinyl chloride and/or mixtures thereof.
- the composite pane contains or consists of glass.
- the thickness of each individual pane of the composite pane can vary widely and be adapted to the requirements of the individual case.
- panes with standard thicknesses of 0.5 mm to 25 mm and preferably 0.5 mm to 5 mm are used.
- the size of the panes can vary widely and depends on their use.
- the composite pane can have any three-dimensional shape and can be planar or curved in one or more directions of space.
- the two panes of the composite pane are firmly connected to one another by an intermediate layer, the intermediate layer containing two or more connecting layers made of a thermoplastic material, corresponding to the connecting layers typically provided in film form that are used to laminate the composite pane.
- the intermediate layer can also contain a connecting layer made of a thermoplastic material, which surrounds the stacking sequence of substrate film and cover film with the intermediate holographic recording medium in a frame-like manner. It is understood that the connecting layers provided in film form fuse during lamination, so that the resulting connecting layers of the Composite panes can also be bonded (fused) together, with a bonding layer made of thermoplastic material on both sides of the stacking sequence.
- Each connecting layer made of a thermoplastic material preferably contains or consists of polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), thermoplastic polyurethane (TPU), polyethylene terephthalate (PET), or mixtures or copolymers or derivatives thereof, particularly preferably PVB.
- PVB polyvinyl butyral
- EVA ethylene vinyl acetate
- TPU thermoplastic polyurethane
- PET polyethylene terephthalate
- mixtures or copolymers or derivatives thereof particularly preferably PVB.
- the composite pane contains an acoustically damping layer.
- This typically comprises at least two outer polymer layers and at least one inner polymer layer lying between them, the inner polymer layer having greater plasticity or elasticity than the outer polymer layers. This results in an acoustically damping layer that has a softer core, while the rigidity of the layer structure increases from the core to the edge.
- the inner polymer layer has a thickness of 0.05 mm to 0.40 mm, for example, and the outer polymer layers have a thickness of 0.20 mm to 0.60 mm, for example.
- Acoustically damping layers are known in the art, see e.g. WO 2017/055470 A1, so there is no need to go into them in more detail here.
- the composite pane contains an infrared radiation (IR) reflecting layer, an infrared radiation (IR) absorbing layer, a UV radiation (UV) reflecting layer, a UV radiation (UV) absorbing layer and/or an electrically heatable coating.
- IR infrared radiation
- UV UV radiation
- UV UV radiation
- electrically heatable coating Such layers are known in the art and are used as standard, e.g. in vehicle windows, so that further explanations are unnecessary.
- the two panes of the composite pane and/or the intermediate layer or one or more connecting layers of the intermediate layer can be clear and colorless, but also tinted or colored.
- “transparent” means that the total transmission of the composite pane complies with the legal requirements in the European Union for windscreens and front side windows and preferably has a transmittance of more than 70% and in particular more than 75% for visible light.
- “transparent” can also mean 10% to 70% light transmission. Accordingly, "opaque” means a light transmission of less than 15%, preferably less than 5%, especially 0%.
- the HUD area is formed by at least one holographically active zone of the holographic recording medium.
- the holographically active zone therefore serves as a holographic mirror for the incident light with a specific wavelength and angle of incidence, i.e. for the image projected onto the HUD area. Since these optical processes are based on diffraction, the angles of incidence and reflection do not have to be the same, which allows for a large variety of possible shapes of the composite panes and their installation situations, in particular very flatly installed windshields.
- the composite pane is preferably a windshield of a motor vehicle.
- the holographically active zone of the holographic recording medium is designed to "mirror" an image projected by a projector onto the holographically active zone.
- the light suitable for the hologram can be generated by conventional HUD projectors.
- the HUD projector is, for example, a liquid crystal (LCD) display, thin film transistor (TFT) display, light emitting diode (LED) display, organic light emitting diode (OLED) display or electroluminescent (EL) display and can also contain laser diodes, in particular with MEMS technology for controlling the laser light.
- the projector irradiates light in the visible wavelength range from 380 nm to 780 nm, provided that the hologram has a mirror function at the wavelength and angle of incidence used.
- the diffraction efficiency describes the proportion of radiation diffracted ("mirrored") in the holographically active zone to the total incident radiation. It is given in % (based on 100% incident radiation) or as a unitless number from 0 to 1 (normalized to the incident radiation).
- the diffraction efficiency is advantageously in the range from 1 to 50%, especially in the range from 5 to 20%.
- the at least one holographically active zone preferably extends over a maximum of 50%, particularly preferably a maximum of 40%, in particular a maximum of 20%, of the area of the Composite pane.
- the HUD area is arranged in an area of the composite pane which is at least partially transparent with a light transmission level (according to ISO 9050:2003) of preferably at least 50%, particularly preferably at least 70%.
- the HUD area is an area of the windshield through which a viewer (for example the driver) can look at the road.
- the at least one holographically active zone is arranged in a (main) viewing area of the composite pane (zone A).
- the composite pane produced by the method according to the invention can be part of a projection arrangement, whereby the HUD area of the composite pane can be illuminated with a projector.
- the projector projects light onto the HUD area (i.e. onto the holographically active zone), which is "mirrored".
- the projector preferably faces the interior-side surface of the inner pane. If the composite pane is installed (for example as a windshield in a vehicle), the projector illuminates the HUD area from an interior (vehicle interior). If the projection arrangement is part of a vehicle, the projector is preferably arranged in the dashboard of the vehicle. The light projected by the projector onto the HUD area of the composite pane is diffracted into the vehicle interior, for example into the field of vision of an occupant.
- Known processes for producing a composite pane can be used to laminate the composite pane.
- so-called autoclave processes can be carried out at an increased pressure of around 1 bar to 15 bar and temperatures of 100 °C to 145 °C for around 2 hours.
- Known vacuum bag or vacuum ring processes work at around 200 mbar and 130 °C to 145 °C, for example.
- the two panes can also be pressed into a composite pane in a calender between at least one pair of rollers.
- Systems of this type are known for producing composite panes and normally have at least one heating tunnel in front of a press. The temperature during the pressing process is, for example, between 40 °C and 150 °C. Combinations of calender and autoclave processes have proven particularly effective in practice.
- vacuum laminators can be used. These consist of one or more heatable and evacuatable chambers in which the first disc and the second disc are heated within, for example, about 60 minutes at a reduced pressure of 0.01 mbar to 800 mbar and temperatures of 80°C to 170°C. This is well known to the expert, so it does not need to be discussed in more detail here
- the invention further extends to the use of the composite pane according to the invention in buildings or in means of transport for traffic on land, in the air or on water, in particular in motor vehicles, for example as a windshield, rear window, side windows and/or roof window.
- motor vehicles for example as a windshield, rear window, side windows and/or roof window.
- the use of the composite pane in motor vehicles is preferred, particularly preferably as a windshield or roof window.
- Figure 1 shows an embodiment of the composite pane according to the invention in a
- Figure 2 shows a projection arrangement with an embodiment of the
- Figure 3 is an enlarged cross-sectional view of a region of the composite pane containing the HUD region H in the projection arrangement of Figure 2
- Figure 4A shows a first stacking sequence of holographic medium and substrate and cover foil in a top view
- Figure 4B shows the first stacking sequence of Figure 4A in a cross-sectional view according to section line B-B'
- FIG. 5 is a flow chart of the method according to the invention.
- Figure 6 shows a second stacking sequence containing the first stacking sequence, as well as disks and connecting layers.
- Figures 1 to 6 illustrate by way of example the composite pane 1 according to the invention and its production.
- Figure 1 shows an embodiment of the composite pane 1, which is a windshield for a vehicle.
- the composite pane 1 is shown in a plan view, looking at an interior-side surface IV of the composite pane 1.
- Figure 2 shows an embodiment of the composite pane 1 as a component of a projection arrangement 100 according to the invention in a cross-sectional view, wherein the projection arrangement 100 is installed in a vehicle.
- the cross-sectional view of Figure 2 corresponds to the section line A-A' of the composite pane 1, as indicated in Figure 1.
- Figure 3 shows an enlarged section of the projection arrangement 100 from Figure 2, wherein the enlarged section shows an area of the composite pane 1 which contains the HUD area H.
- Figures 4A and 4B show a stacking sequence 6 with a holographic recording medium between the substrate and cover foil in a top view ( Figure 4A) and in a cross-sectional view along the section line B-B'.
- Figure 5 shows a flow chart of the method according to the invention.
- Figure 6 illustrates a second stacking sequence 19 containing the first stacking sequence 6, as well as the two disks 2, 3 and the connecting layers 18, 18', 18".
- the composite pane 1 has an upper edge and a lower edge as well as two side edges connecting the upper edge and the lower edge (all together this results in a circumferential edge of the composite pane 1).
- the lower edge (also called the engine edge) of the composite pane 1 refers to the edge which faces the ground in the installed position.
- the upper edge (also called the roof edge) of the composite pane 1 refers to the edge which faces the vehicle roof in the installed position in a vehicle.
- the composite pane 1 comprises an outer pane 2, an inner pane 3 and an intermediate layer 4 arranged between the outer pane 2 and the inner pane 3.
- the outer pane 2 has an outer surface I facing away from the intermediate layer 4 and an interior surface II facing the intermediate layer 4.
- the inner pane 3 has an outer surface III facing the intermediate layer 4 and an interior surface IV facing away from the intermediate layer 4.
- the outer surface I of the outer pane 2 is simultaneously the surface of the composite pane 1 which faces the external environment 13, and the interior surface IV of the inner pane 3 is simultaneously the surface of the composite pane 1 which faces the interior 12 of the vehicle.
- the composite pane 1 has, for example, a shape and curvature that is usual for windshields.
- the outer pane 2 and the inner pane 3 are each made of glass, preferably thermally tempered soda-lime glass, and are transparent to visible light.
- the outer pane 2 has a thickness of 2.1 mm, for example, and the inner pane 3 has a thickness of 1.5 mm, for example.
- An opaque masking layer 5 is applied to the interior surface II of the outer pane 2.
- the masking layer 5 extends along the peripheral edge of the composite pane 1 and is applied in the edge region 7 directly adjacent to the lower edge of the composite pane 1.
- the masking layer 5 is opaque and prevents the view of structures arranged on the inside or outside of the composite pane 1, for example an adhesive bead for gluing the composite pane 1 into a vehicle body.
- the masking layer 5 consists of an electrically non-conductive material conventionally used for black printing, for example a black-colored screen printing ink that is baked in.
- the composite pane 1 has a HUD area H, which is intended to display a head-up display image for a driver or passenger of the vehicle.
- the HUD area H is arranged in the see-through area of the composite pane 1, so that an image projected onto the HUD area H can be perceived by an observer as if it were appearing behind the composite pane 1 (i.e. in the external environment 13).
- the HUD area H is formed by a holographically active zone 8, which is embedded between a substrate film 15 and a cover film 16, for example made of polycarbonate.
- the holographic recording medium 17 containing the holographic-active zone 8, as well as the substrate film 15 and cover film 16 together form a first stacking sequence 6.
- the holographic-active zone 8 therefore implements a mirror function for light of a narrow wavelength range incident at a specific angle, corresponding to the hologram recorded in the holographic-active zone 8.
- the holographic-active zone 8 is, for example, suitably designed to diffract incident light with a diffraction efficiency in the range of 5 to 20%.
- a projector 10 is arranged on a dashboard 14 of the vehicle, which projects a virtual image in the form of visible radiation (light) 11 onto the HUD area H of the composite pane 1.
- the angle of incidence a1 is the angle at which the radiation 11 of the projector 10 strikes the holographically active zone 8 (see Figure 3).
- the HUD area H irradiated by the projector 10 is indicated by a dashed area with a trapezoidal shape in the composite pane 1 of Figure 1.
- the radiation 11 of the projector 10 is diffracted at the holographically active zone 8 and the diffracted radiation 1 T is visually perceived by an observer (for example the driver of the vehicle).
- the diffraction angle a2 is different from the angle of incidence a1, but can also be the same.
- the diffraction angle a2 and the incidence angle a1 are different, whereby the diffraction angle a2 is preferably selected such that no secondary images (ghost images) are visible in the eye box of the observer.
- the projector 10 illuminates the HUD area H of the composite pane 1, creating a HUD image (head-up display image) for the viewer.
- the first stacking sequence 6 is first produced from the substrate film 15 having the holographic recording medium 17 and the cover film 16 lying above it.
- the holographically active zone 8 with a mirror function for at least one wavelength and at least one angle of incidence has already been created by holographic exposure (step a).
- the holographic recording medium 17 is located between the substrate film 15 and the cover film 16.
- the substrate film 15 comprising the holographic recording medium 17 and the cover film 16 are placed in a holographically active zone 8. area is thermally welded, thereby producing a thermally welded connection area 9 (step b).
- Figure 4A shows the first stacking sequence 6 with holographic recording medium between substrate film 15 and cover film 16 in a top view.
- Figure 4B shows a cross-sectional view of the first stacking sequence 6 along the section line B-B'.
- the substrate film 15 and the cover film 16 are clearly visible, which are thermally welded together in the connection area 9.
- the holographic recording medium 17 is completely embedded between the substrate film 15 and the cover film 16.
- the holographic recording medium 17 has a holographically active zone 8, here with a rectangular shape, for example, the area of which is smaller than the area of the holographic recording medium 17, for example.
- the HUD area H is formed by the holographically active zone 8.
- the area occupied by the holographically active zone 8 is smaller than an area occupied by the holographic recording medium 17.
- the area of the holographic recording medium 17 could completely cover an optically transparent see-through area of the composite pane 1, so that there is no potentially optically disturbing edge in the see-through area.
- the holographic recording medium 17 completely covers the substrate film 15 except for a circumferential edge zone, which here corresponds to the thermally welded connection region 9.
- step c the stacking sequence 6 with thermally welded connection region 9 of substrate film 15 and cover film 16 is cut to a predetermined size.
- the outer pane 2 and the inner pane 3, as well as two connecting layers 18, 18' are made of a thermoplastic (in film form).
- the first stacking sequence 6 is inserted into the cutout 20 of a further connecting layer 18" (in film form), which surrounds the first stacking sequence 6 in the form of a frame in the manner of a passpartout.
- the first stacking sequence 6 is thus inserted into a cutout 20 of the further connecting layer 18" (step d).
- step f the second stack sequence 19 is laminated, thereby producing the composite pane 1 (step f).
- the above method produces a composite pane 1 for a projection arrangement 100 with a HUD area (H), which has an inner pane 3 and an outer pane 3, which are firmly connected to one another by an intermediate layer 4 containing three connecting layers 18, 18', 18" made of a thermoplastic.
- the three connecting layers 18, 18', 18" made of a thermoplastic are provided in film form before lamination and fuse together through lamination, but can also be individualized, at least conceptually, after lamination.
- the first stacking sequence 6 of substrate film 15 and cover film 16 with the intermediate holographic recording medium 17, in which the holographically active zone 8 with mirror function for at least one wavelength and at least one angle of incidence is written, is embedded in the intermediate layer 4 and in particular in thermoplastic material.
- the substrate film 15 and cover film 16 are thermally welded in the connection area 9, which can be seen on the finished composite pane 1.
- the thickness of the connecting layer 18 made of a thermoplastic material, which is located between the first stacking sequence 6 and the inner pane 3, is smaller than the thickness of the further connecting layer 18' made of a thermoplastic material between the first stacking sequence 6 and the outer pane 2.
- the thickness of the connecting layer 18 made of a thermoplastic material, which is located between the first stacking sequence 6 and the inner pane 3, is in a value range from 0.05 mm to less than 0.38 mm
- the thickness of the connecting layer 18' made of a thermoplastic material, which is located between the first stacking sequence 6 and the outer pane 2 is in a value range from 0.38 mm to 1 mm.
- the composite pane 1 can have further layers (not shown), in particular an acoustically dampening layer, an IR-reflecting and/or IR-absorbing layer, a UV-reflecting and/or UV-absorbing layer, - an electrically heatable layer.
- the invention provides an improved method for producing a composite pane, by means of which optical impairment of the composite pane in the area of the holographic recording medium caused by delamination can be avoided.
- the composite pane can be produced cost- and time-efficiently using industrially used production systems, whereby the production of the composite pane can be implemented in a simple manner using common manufacturing processes.
- H HUD area a1 incident angle a2 diffraction angle
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Optics & Photonics (AREA)
- Holo Graphy (AREA)
- Instrument Panels (AREA)
- Joining Of Glass To Other Materials (AREA)
Abstract
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202480037207.8A CN121263303A (zh) | 2023-06-15 | 2024-06-05 | 用于生产用于全息抬头显示器的层合嵌板的方法及层合嵌板 |
| KR1020267000372A KR20260018158A (ko) | 2023-06-15 | 2024-06-05 | 홀로그램 헤드업 디스플레이용 적층 판유리 제조 방법 및 적층 판유리 |
| EP24737006.7A EP4727769A1 (de) | 2023-06-15 | 2024-06-05 | Verfahren zur herstellung einer verbundscheibe für ein holographisches head-up-display, sowie verbundscheibe |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP23179618.6 | 2023-06-15 | ||
| EP23179618 | 2023-06-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024256243A1 true WO2024256243A1 (de) | 2024-12-19 |
Family
ID=86861966
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2024/065500 Ceased WO2024256243A1 (de) | 2023-06-15 | 2024-06-05 | Verfahren zur herstellung einer verbundscheibe für ein holographisches head-up-display, sowie verbundscheibe |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4727769A1 (de) |
| KR (1) | KR20260018158A (de) |
| CN (1) | CN121263303A (de) |
| WO (1) | WO2024256243A1 (de) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012156124A1 (de) | 2011-05-16 | 2012-11-22 | Robert Bosch Gmbh | Hud mit holographischen optischen elementen |
| WO2017055470A1 (de) | 2015-10-01 | 2017-04-06 | Saint-Gobain Glass France | Verbundglas mit dünner innenscheibe und schalldämpfender thermoplastischer zwischenschicht |
| DE102017212451A1 (de) | 2017-07-20 | 2019-01-24 | Robert Bosch Gmbh | Projektionsvorrichtung |
| US20190056596A1 (en) | 2015-05-04 | 2019-02-21 | Thalmic Labs Inc. | Systems, devices, and methods for angle- and wavelength-multiplexed holographic optical elements |
| CN114660695A (zh) | 2022-03-15 | 2022-06-24 | 福耀玻璃工业集团股份有限公司 | 全息显示玻璃及其加工方法和车辆 |
-
2024
- 2024-06-05 EP EP24737006.7A patent/EP4727769A1/de active Pending
- 2024-06-05 CN CN202480037207.8A patent/CN121263303A/zh active Pending
- 2024-06-05 KR KR1020267000372A patent/KR20260018158A/ko active Pending
- 2024-06-05 WO PCT/EP2024/065500 patent/WO2024256243A1/de not_active Ceased
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012156124A1 (de) | 2011-05-16 | 2012-11-22 | Robert Bosch Gmbh | Hud mit holographischen optischen elementen |
| US20190056596A1 (en) | 2015-05-04 | 2019-02-21 | Thalmic Labs Inc. | Systems, devices, and methods for angle- and wavelength-multiplexed holographic optical elements |
| WO2017055470A1 (de) | 2015-10-01 | 2017-04-06 | Saint-Gobain Glass France | Verbundglas mit dünner innenscheibe und schalldämpfender thermoplastischer zwischenschicht |
| DE102017212451A1 (de) | 2017-07-20 | 2019-01-24 | Robert Bosch Gmbh | Projektionsvorrichtung |
| CN114660695A (zh) | 2022-03-15 | 2022-06-24 | 福耀玻璃工业集团股份有限公司 | 全息显示玻璃及其加工方法和车辆 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP4727769A1 (de) | 2026-04-22 |
| KR20260018158A (ko) | 2026-02-06 |
| CN121263303A (zh) | 2026-01-02 |
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