DE102020101373A1 - Method for producing a laminated glass unit with an optical and / or holographic function, laminated glass unit with an optical and / or holographic function - Google Patents

Abstract

The invention relates to a method for producing a laminated glass unit (10) with an optical and / or holographic function and to such a laminated glass unit (10) with an optical and / or holographic function itself. It is provided that a method for producing a laminated glass unit (10) with optical and / or holographic function is provided. Two glass plates (12, 14), at least one polyvinyl butyral layer (18, 22) and at least one photopolymer layer (20) with an optical and / or holographic function are provided. First, a separate unit (16) is created, a first polyvinyl butyral layer (18) with a layer thickness of 20 μm to 100 μm being coated on the at least one photopolymer layer (20). The separate unit (16) is then arranged between the two glass plates (12, 14), with a second polyvinyl butyral layer (22) with a layer thickness of 300 μm to 1,200 μm between at least one glass plate (12, 14) and the separate unit (16) µm is arranged.

Description

The invention relates to a method for producing a laminated glass unit with an optical and / or holographic function and to such a laminated glass unit with an optical and / or holographic function itself.

Laminated glass units are manufactured nowadays for a wide variety of purposes and industries. In addition to a pure protective function (for example against the effects of the weather), extended functions are increasingly being integrated into such laminated glass units. These extended protective functions are usually provided directly in the respective components of these laminated glass units. However, especially for special areas of use, the previously known laminated glass units are often too inflexible due, for example, to their additional weight units due to the integration of the additional functions. For example, the previous approaches from the prior art can only be used to a limited extent, if at all, for vehicle construction in particular. In the following, some examples from the prior art are presented which, in addition to a protective function, have other additional functions.

So is from the pamphlet US 5,066,525 A1 a laminated glass plate with a hologram sheet as known. In particular, this document relates to a laminated glass pane with pores of a hologram sheet therein. For example, the laminated glass pane is a vehicle windshield in which the hologram film is used as a combiner of a head-up display. The laminated glass uses either a film or two films made of polyvinyl butyral resin (PVB) as an adhesive. In the former case, the hologram film is arranged between the PVB film and one of the glass plates and shielded from the PVB film by a transparent resin or glass film that prevents the plasticizer contained in the PVB film from being transferred to the hologram. In the latter case, the hologram film is arranged between the two films made of PBB film and shielded from each PVB film by a transparent resin or glass film with the properties mentioned above. By shielding the hologram sheet from the PVB film, the diffraction wavelength of the hologram sheet does not shift significantly from the desired wavelength. In order to prevent the holographic images from being blurred, it is preferred that each transparent film has a very smooth surface for shielding purposes, at least on the side facing the PVB film.

From the pamphlet US 2008/0129073 A1 a windshield for automobiles can be seen as known. In the case of windshields for automobiles used for head-up displays, a windshield for automobiles is provided, which is characterized in that two panes of an inner side and an outer side are connected to one another using two interlayer films made by an optical functional film become. The lamination of a rotary optical element in the form of a film is incorporated into the two interlayer films, and the optical functional film has a thickness of 12 µm to 22 µm.

The invention is now based on the object of providing an alternative method for producing a laminated glass unit with an optical and / or holographic function and such a laminated glass unit with an optical and / or holographic function which enables reliable product properties.

In a preferred embodiment of the invention it is provided that a method for producing a laminated glass unit with an optical and / or holographic function is provided. Such a method comprises the following steps: providing two glass plates, providing at least one polyvinyl butyral layer, providing at least one photopolymer layer with an optical and / or holographic function. In addition, the method in this preferred embodiment comprises the following further steps: creating a separate unit, wherein a first polyvinyl butyral layer with a layer thickness of 20 μm to 100 μm is coated on the at least one photopolymer layer, arranging the separate unit between the two glass plates, with between At least one glass plate and a separate unit, a second polyvinyl butyral layer with a layer thickness of 300 µm to 1200 µm is arranged. In this way it is possible to provide a method which ensures particularly reliable production of a laminated glass unit with an optical and / or holographic function. In addition, it is possible to use the method presented to produce an optically defect-free laminated glass unit with an optical and / or holographic function. The separately produced unit is produced beforehand in such a way that this coating step already ensures sufficient quality for a reliably functioning optical and / or holographic function. The thinner the selected polyvinyl butyral layer, the greater the influence of the glass on rigidity. Optical interference can then be minimized accordingly.

In particular, this means that these layers cannot form waves during a later extended bonding process, for example in an autoclave.

A separate unit prefabricated in this way can then be functionally integrated into the final product using further process steps, for example by means of common lamination process steps. The thin separate unit is designed to be flexible and conformable so that no disruptive wave movements and wave patterns occur during further processing, which would negatively affect the optical and / or holographic function. The photopolymer layer can also be provided in the form of a film or a film composite. The optical and / or holographic functions are in each case provided beforehand in the respective photopolymer layer or are written into it. For example, only one photopolymer layer is provided. A plurality of photopolymer layers can also be provided, with a respective photopolymer layer then having a respective optical and / or holographic function which produces either a separate or a composite effect. In general, when integrating photopolymer layers or films with an optical and / or holographic function, waviness must be avoided, since this leads to a deformation of the diffracted waves.

In other words, such a waviness in the optical or holographic elements leads to disturbances in the function to be implemented. These disruptions can be reliably avoided in the products manufactured by means of the method presented, so that a particularly reliable, in particular an optically defect-free, product can be manufactured.

In a further preferred embodiment of the invention it is provided that a laminated glass unit with an optical and / or holographic function is provided. Such a laminated glass unit comprises two glass plates, at least one polyvinyl butyral layer and at least one photopolymer layer with an optical and / or holographic function. The laminated glass unit comprises a separately produced unit, this unit comprising a first polyvinyl butyral layer with a layer thickness of 20 μm to 100 μm and the at least one photopolymer layer. This unit is arranged between the two glass plates, a second polyvinyl butyral layer with a layer thickness of 300 μm to 1,200 μm being arranged between at least one of the two glass plates and the separate unit. The advantages mentioned above also apply, insofar as they can be transferred, to the laminated glass unit presented.

Further preferred embodiments of the invention emerge from the other features mentioned in the subclaims.

In a further embodiment of the invention, it is provided that the at least one photopolymer layer has a layer thickness of 20 μm to 100 μm. In this way, an optically defect-free product can be reliably manufactured.

In addition, a further embodiment of the invention provides that the first polyvinyl butyral layer is arranged between the first glass plate and the at least one photopolymer layer and the second polyvinyl butyral layer is arranged between the second glass plate and the at least one photopolymer layer. In this way, the separate unit can be integrated into the overall product in a particularly stable manner, so that a reliable, in particular optically defect-free, product can be provided.

In a further embodiment of the invention it is also provided that a first PET layer is arranged between the second polyvinyl butyral layer and the at least one photopolymer layer. The advantages mentioned above can thus be achieved even better. In addition, the PET layer chemically protects the photopolymer from the plasticizers in the PVB.

Furthermore, in a further embodiment of the invention it is provided that the first PET layer has a layer thickness of 20 μm to 100 μm. These very thin layers of the PET layer are already sufficient to achieve the advantages mentioned above. In addition, an optically defect-free product can be produced at the same time, which is therefore also suitable for special purposes. In particular, such a product can be used reliably in the vehicle industry, for example.

In addition, a further embodiment of the invention provides that an OCA layer is arranged between the first PET layer and the at least one photopolymer layer. In this way, the previously manufactured separate unit can be integrated particularly well into the overall product.

A further embodiment of the invention also provides that a second PET layer is arranged between the first polyvinyl butyral layer and the at least one photopolymer layer when creating the separate unit, this second PET layer having a layer thickness of 20 μm to 100 μm. This second PET layer is processed during the creation of the separate unit, so that the separate unit thus has additional stability for the subsequent processing steps. In this way, wave formation can also be reliably prevented. This PET layer also serves to protect the photopolymer from the plasticizers of the polyvinyl butyral layer.

Furthermore, a further embodiment of the invention provides that a maximum of three photopolymer layers are provided. In this way, the production of a particularly light product is promoted. In the case of three photopolymer layers, a high efficiency of the holographic function can also be guaranteed.

Finally, in a further embodiment of the invention it is provided that the at least one photopolymer layer has a layer thickness of 20 μm to 100 μm and the first polyvinyl butyral layer is arranged between the first glass plate and the at least one photopolymer layer and the second polyvinyl butyral layer is arranged between the second glass plate and the at least one photopolymer layer is arranged and wherein a first PET layer is arranged between the second polyvinyl butyral layer and the at least one photopolymer layer, the first PET layer having a layer thickness of 20 μm to 100 μm and wherein between the first PET layer and the at least a photopolymer layer, an OCA layer is arranged and a second PET layer is arranged between the first polyvinyl butyral layer and the at least one photopolymer layer, this second PET layer having a layer thickness of 20 μm to 100 μm. The advantages mentioned above also apply, insofar as they can be transferred, to this embodiment variant of the laminated glass unit presented.

The method is suitable for producing a laminated glass unit with an optical and / or holographic function, which is suitable, for example, in any application for products in the automotive industry. Such laminated glass units can also be used in general in the transport or traffic sector. In addition, in addition to being used in the automotive industry, the presented laminated glass units can also be used in the construction sector or in general for any architectural task, particularly in interior design. For example, the laminated glass units presented can be used for transparent display devices and in connection with head-up display devices. The laminated glass units presented can also be used in connection with sensor devices and camera systems or can be provided in an integrated manner there. For example, a transparent display and a light guide in the laminated glass unit can thus be implemented using volume hologram technology. Photopolymer films or layers with optical and / or holographic functions can thus be integrated into any vehicle glazing.

The various embodiments of the invention mentioned in this application can be advantageously combined with one another, unless stated otherwise in the individual case.

• 1 eine schematische Darstellung einer Verbundglaseinheit mit optischer und/oder holografischer Funktion;
• 2 eine schematische Darstellung einer weiteren Verbundglaseinheit mit optischer und/oder holografischer Funktion;
• 3 ein Verfahrensablaufdiagramm von einem Verfahren zur Herstellung einer Verbundglaseinheit mit optischer und/oder holografischer Funktion.

The invention is explained below in exemplary embodiments with reference to the accompanying drawings. Show it:

• 1 a schematic representation of a laminated glass unit with an optical and / or holographic function;
• 2 a schematic representation of a further laminated glass unit with an optical and / or holographic function;
• 3 a process flow diagram of a method for producing a laminated glass unit with an optical and / or holographic function.

1 shows a schematic representation of a laminated glass unit 10 with optical and / or holographic function. This is a laminated glass unit 10 with respective external glass panes 12th , 14th shown. In this embodiment variant, the first glass pane 12th the same thickness as the second pane of glass 14th on. In an embodiment variant not shown in detail, the layer thicknesses of the glass panes can vary 12th , 14th also differ. For example, a pane that is on the outside during an application can be provided thicker than the other pane. Between the first and second pane of glass 12th , 14th is also a separate unit 16 shown arranged. This separate entity 16 is separate from being integrated into the laminated glass unit 10 created and includes an illustrated first polyvinyl butyral layer 18th and an illustrated photopolymer layer 20th . In an embodiment variant not shown in detail, more than one photopolymer layer can be used 20th be provided. The first layer of polyvinyl butyral 18th is in the direction of the first pane of glass 12th aligned provided and the photopolymer layer 20th is on the opposite side on the polyvinyl butyral layer 18th intended. The first layer of polyvinyl butyral 18th can for example have a layer thickness of 20 µm to 100 µm.

The one in the 1 The individual components shown are not shown true to scale. It is a purely schematic representation, which is only intended to clarify the general arrangement of the individual components with respect to one another.

The first layer of polyvinyl butyral 18th is in particular on the photopolymer layer 20th provided coated on it. In relation to the image plane is above the second pane of glass 14th a second layer of polyvinyl butyral 22nd shown. This second Polyvinyl butyral layer 22nd can also contain A-polyvinyl butyral or be made entirely of A-polyvinyl butyral. The layer thickness of this second polyvinyl butyral layer 22nd can for example be 300 µm to 1200 µm.

2 shows a schematic representation of a further laminated glass unit 10 with optical and / or holographic function. In the 2 Laminated glass unit shown 10 only provides an extended laminated glass unit 10 the in 1 laminated glass unit shown 10 represents, so that the same reference numerals are provided without these being introduced again at this point. Additionally is in the separate unit 16 a second PET layer 26th shown. This second PET layer 26th has a layer thickness of 20 µm to 100 µm, for example. There is also a first PET layer 24 shown, which is based on the image plane above the second polyvinyl butyral layer 22nd is shown. This first layer of PET 24 has a layer thickness of 20 µm to 100 µm, for example. Between this first PET layer 24 and the separate unit 16 is also an OCA layer 28 shown.

3 shows a process flow diagram 100 of a method for manufacturing a laminated glass unit 10 with optical and / or holographic function. In a first process step 110 become two panes of glass 12th , 14th provided. In a second process step 120 becomes at least one polyvinyl butyral layer 18th , 22nd provided. This polyvinyl butyral layer 18th , 22nd can also be provided in such a way that a device provided for uniform application of such a layer is provided.

In other words, this is provided polyvinyl butyral layer 18th , 22nd for example provided in one piece or as a layer which can be applied in one piece. In a third process step 130 becomes at least one photopolymer layer 20th provided with an optical and / or holographic function. In a fourth process step 140 becomes a separate entity 16 created, with a first layer of polyvinyl butyral 18th with a layer thickness of 20 μm to 100 μm on the at least one photopolymer layer 20th is coated. In a fifth process step 150 becomes this separate entity 16 between the two glass plates 12th , 14th arranged, between at least one glass plate 12th , 14th and separate unit 16 a second layer of polyvinyl butyral 22nd is arranged with a layer thickness of 300 µm to 1,200 µm.

In a particularly specialized variant of the method presented, a PET layer is used 24 with a polyvinyl butyral layer 22nd coated. This is done on the PET side without the polyvinyl butyral layer 22nd the application of the photopolymer layer in one to three steps 20th , which is exposed or written on directly after the application.

List of reference symbols

10

Laminated glass unit

12th

first pane of glass

14th

second pane of glass

16

separate unit

18th

first layer of polyvinyl butyral

20th

Photopolymer layer

22nd

second layer of polyvinyl butyral

24

first PET layer

26th

second PET layer

28

OCA layer

100

Process flow diagram

110

first procedural step

120

second procedural step

130

third process step

140

fourth procedural step

150

fifth procedural step

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• US 5066525 A1 [0003]
• US 2008/0129073 A1 [0004]

Claims (10)

A method for producing a laminated glass unit (10) with an optical and / or holographic function, comprising the following steps: • providing two glass plates (12, 14); • providing at least one polyvinyl butyral layer (18, 22); · Provision of at least one photopolymer layer (20) with an optical and / or holographic function, characterized in that the method comprises the following further steps: • Creation of a separate unit (16), a first polyvinyl butyral layer (18) with a layer thickness of 20 μm to 100 μm is coated onto the at least one photopolymer layer (20); • Arranging the separate unit (16) between the two glass plates (12, 14), a second polyvinyl butyral layer (22) with a layer thickness of 300 μm to 1,200 μm being arranged between at least one glass plate (12, 14) and separate unit (16) will. Procedure according to Claim 1 wherein the at least one photopolymer layer (20) has a layer thickness of 20 μm to 100 μm. Method according to one of the preceding claims, wherein the first polyvinyl butyral layer (18) is arranged between the first glass plate (12) and the at least one photopolymer layer (20) and the second polyvinyl butyral layer (22) is arranged between the second glass plate (14) and the at least one photopolymer layer (20) is arranged. Procedure according to Claim 3 wherein a first PET layer (24) is arranged between the second polyvinyl butyral layer (22) and the at least one photopolymer layer (20). Procedure according to Claim 4 , the first PET layer (24) having a layer thickness of 20 μm to 100 μm. Procedure according to one of the previous ones Claims 4 until 5 wherein an OCA layer (28) is arranged between the first PET layer (24) and the at least one photopolymer layer (20). Method according to one of the preceding claims, wherein when creating the separate unit (16) between the first polyvinyl butyral layer (18) and the at least one photopolymer layer (20), a second PET layer (26) is arranged, this second PET layer (26 ) has a layer thickness of 20 µm to 100 µm. Method according to one of the preceding claims, a maximum of three photopolymer layers (20) being provided. Laminated glass unit (10) with an optical and / or holographic function comprising two glass plates (12, 14), at least one polyvinyl butyral layer (18, 22) and at least one photopolymer layer (20) with an optical and / or holographic function, characterized in that the laminated glass unit ( 10) comprises a separately produced unit (16), this unit (16) comprising a first polyvinyl butyral layer (18) with a layer thickness of 20 μm to 100 μm and the at least one photopolymer layer (20), and this unit (16) between the two glass plates (12, 14) is arranged, wherein between at least one of the two glass plates (12, 14) and the separate unit (16) a second polyvinyl butyral layer (22) with a layer thickness of 300 μm to 1,200 μm is arranged. Laminated glass unit (10) according to Claim 9 wherein the at least one photopolymer layer (20) has a layer thickness of 20 µm to 100 µm and wherein the first polyvinyl butyral layer (18) is arranged between the first glass plate (12) and the at least one photopolymer layer (20) and the second polyvinyl butyral layer (22) is arranged between the second glass plate (14) and the at least one photopolymer layer (20) and wherein a first PET layer (24) is arranged between the second polyvinyl butyral layer (22) and the at least one photopolymer layer (20), the first PET layer being arranged Layer (24) has a layer thickness of 20 µm to 100 µm and wherein an OCA layer (28) is arranged between the first PET layer (24) and the at least one photopolymer layer (20) and wherein between the first polyvinyl butyral layer (18) and a second PET layer (26) is arranged on the at least one photopolymer layer (20), this second PET layer (26) having a layer thickness of 20 μm to 100 μm is.

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