Abstract
A multilayer colored thermoplastic intermediate layer, includes a first thermoplastic layer with a wedge-shaped cross-section; and a second thermoplastic layer having a substantially constant thickness, wherein the first thermoplastic layer is colorless and the second thermoplastic layer is colored with a dye.
Claims
1. A multilayer colored thermoplastic intermediate layer, comprising: a first thermoplastic layer with a wedge-shaped cross-section; and a second thermoplastic layer having a substantially constant thickness, wherein the first thermoplastic layer is colorless and the second thermoplastic layer is colored with a dye.
2. The multilayer colored thermoplastic intermediate layer according to claim 1, wherein the light transmittance through the multilayer colored thermoplastic intermediate layer is constant over its entire area.
3. The multilayer colored thermoplastic intermediate layer according to claim 1, wherein the multilayer colored thermoplastic intermediate layer has a wedge angle in the range from 0.1 mrad to 1.0 mrad.
4. The multilayer colored thermoplastic intermediate layer according to claim 1, wherein the first thermoplastic layer contains at least polyvinyl butyral (PVB), or ethylene vinyl acetate (EVA), or polyurethane (PU), or mixtures or copolymers or derivatives thereof, and the second thermoplastic layer contains a dye and at least polyvinyl butyral (PVB), or ethylene vinyl acetate (EVA), or polyurethane (PU), or mixtures or copolymers or derivatives thereof.
5. The multilayer colored thermoplastic intermediate layer according to claim 1, additionally including an acoustically damping layer having a substantially constant thickness, wherein the acoustically damping layer is arranged between the first thermoplastic layer and the second thermoplastic layer and is colorless or colored with a dye.
6. The multilayer colored thermoplastic intermediate layer according to claim 1, additionally including a third thermoplastic layer that is colorless and has a wedge-shaped cross-section, wherein the second thermoplastic layer is arranged between the first thermoplastic layer and the third thermoplastic layer.
7. The multilayer colored thermoplastic intermediate layer according to claim 6, wherein the second thermoplastic layer is a layer having acoustically damping properties.
8. A composite pane, at least comprising a first pane, a second pane, and a multilayer colored thermoplastic intermediate layer according to claim 1 arranged between the first pane and the second pane.
9. The composite pane according to claim 8, additionally comprising at least one additional intermediate layer that is arranged between the first pane and the multilayer colored thermoplastic intermediate layer or between the second pane and the multilayer colored thermoplastic intermediate layer and has a substantially constant thickness.
10. The composite pane according to claim 8, wherein the composite pane is a vehicle pane.
11. A projection arrangement for a head-up display for displaying information for a viewer in an HUD region, comprising: a composite pane according to claim 8, and a projector aimed at the HUD region.
12. A method for producing a multilayer colored thermoplastic intermediate layer according to claim 1, comprising: co-extrusion of at least one colorless first thermoplastic layer with a wedge-shaped cross-section and a dye-colored second thermoplastic layer with substantially constant thickness.
13. A method for producing a multilayer colored thermoplastic intermediate layer according to claim 1, comprising: providing a colorless first thermoplastic layer having a wedge-shaped cross-section; extruding a dye-colored second thermoplastic layer having a substantially constant thickness; arranging the colorless first thermoplastic layer and the dye-colored second thermoplastic layer one above the other in a planar manner; joining the colorless first thermoplastic layer and the dye-colored second thermoplastic layer at least in a circumferential edge region.
14. The method according to claim 13, additionally comprising embossing indentations in at least one of surfaces of the colorless first thermoplastic layer and in at least one of surfaces of the dye-colored second thermoplastic layer.
15. A method comprising providing a multilayer colored thermoplastic intermediate layer according to claim 1 in a vehicle pane in a vehicle of locomotion for travel on land, in the air, or on water.
16. The multilayer colored thermoplastic intermediate layer according to claim 3, wherein the wedge angle is in the range from 0.3 mrad to 0.6 mrad.
17. The multilayer colored thermoplastic intermediate layer according to claim 4, wherein the first thermoplastic layer contains polyvinyl butyral (PVB) and plasticizer, and the second thermoplastic layer contains a dye and polyvinyl butyral (PVB) and plasticizer.
18. The composite pane according to claim 9, wherein the at least one additional intermediate layer is an infrared-radiation-absorbing layer, an infrared-radiation-reflecting layer, a UV-radiation-absorbing layer, a barrier layer, an intermediate layer having acoustically damping properties, or a combination of these.
19. The composite pane according to claim 10, wherein the vehicle pane is a windshield for a motor vehicle.
20. The method according to claim 15, wherein the vehicle pane is a windshield that is used as a projection surface of a projection arrangement for a head-up display.
Description
[0120] They depict:
[0121] FIG. 1 the cross-section of one embodiment of a multilayer colored thermoplastic intermediate layer according to the invention,
[0122] FIG. 2 the cross-section of another embodiment of a multilayer colored thermoplastic intermediate layer according to the invention:
[0123] FIG. 3 the cross-section of another embodiment of a multilayer colored thermoplastic intermediate layer according to the invention;
[0124] FIG. 4 the cross-section of another embodiment of a multilayer colored thermoplastic intermediate layer according to the invention;
[0125] FIG. 5 the cross-section of another embodiment of a multilayer colored thermoplastic intermediate layer according to the invention;
[0126] FIG. 6 the cross-section of one embodiment of a composite pane according to the invention;
[0127] FIG. 7 the cross-section of another embodiment of a composite pane according to the invention;
[0128] FIG. 8 the cross-section of another embodiment of a composite pane according to the invention;
[0129] FIG. 9 the cross-section of one embodiment of a projection arrangement according to the invention;
[0130] FIG. 10 a flow chart of one embodiment of a method according to the invention;
[0131] FIG. 11 a flow chart of another embodiment of a method according to the invention.
[0132] FIG. 1 depicts one embodiment of a multilayer colored thermoplastic intermediate layer 1 according to the invention in cross-section. In the embodiment depicted in FIG. 1, the multilayer colored thermoplastic intermediate layer 1 consists of a first thermoplastic layer 2 with a wedge-shaped cross-section and a second thermoplastic layer 3 of constant thickness. The first thermoplastic layer thus has a thicker first end and a thinner second end. The increase in thickness from the second end to the first end of the first thermoplastic layer 2 and thus also the increase in thickness from the second end to the first end of the multilayer colored thermoplastic intermediate layer 1 is continuously linear in the embodiment depicted in FIG. 1. The first thermoplastic layer 2 is colorless and the second thermoplastic layer 3 is colored, for example, with an ink. The second thermoplastic layer 3 is, for example, green colored. However, in principle, any other color is also possible, with typical colors for the automobile market being green, blue, and gray.
[0133] In the embodiment depicted in FIG. 1, the first thermoplastic layer 2 and thus also the multilayer colored thermoplastic intermediate layer 1 has a wedge angle of 0.5 mrad.
[0134] The first thermoplastic layer 2 is, for example, 0.38 mm thick at its thinner second end, and the second thermoplastic layer 3 is 0.38 mm thick. Consequently, in the embodiment depicted in FIG. 1, the multilayer colored thermoplastic intermediate layer 1 is 0.76 mm thick at its thinner second end.
[0135] In the embodiment depicted in FIG. 1, the first thermoplastic layer 2 and the second thermoplastic layer 3 are, for example, made of PVB, with the second thermoplastic layer 3 colored with an ink as described above.
[0136] FIG. 2 depicts another embodiment of a multilayer colored thermoplastic intermediate layer 1 according to the invention in cross-section. The embodiment depicted in FIG. 2 differs from that depicted in FIG. 1 only in that the first thermoplastic layer 2 and thus also the multilayer colored thermoplastic intermediate layer 1 has a plateau at the thicker first end in cross-section.
[0137] FIG. 3 depicts another embodiment of a multilayer colored thermoplastic intermediate layer 1 according to the invention in cross-section. The embodiment depicted in FIG. 3 differs from that depicted in FIG. 1 only in that in the case of the first thermoplastic layer 2 and thus also in the case of the multilayer colored thermoplastic intermediate layer 1, the wedge angle varies in the progression from the thinner second end to the thicker first end.
[0138] FIG. 4 depicts another embodiment of a multilayer colored thermoplastic intermediate layer 1 according to the invention in cross-section. The embodiment depicted in FIG. 4 differs from that depicted in FIG. 1 in that the multilayer colored thermoplastic intermediate layer 1 has, in addition to the first thermoplastic layer 2 and the second thermoplastic layer 3, an acoustically damping layer 4 that is arranged between the first thermoplastic layer 2 and the second thermoplastic layer 3. In the embodiment depicted in FIG. 4, this acoustically damping layer has a constant thickness of 100 μm (microns), is colorless, and contains PVB and plasticizer.
[0139] FIG. 5 depicts another embodiment of a multilayer colored thermoplastic intermediate layer 1 according to the invention in cross-section. The embodiment depicted in FIG. 5 differs from that depicted in FIG. 1 in that the multilayer colored thermoplastic intermediate layer 1 has, in addition to the first thermoplastic layer 2 and the second thermoplastic layer 3, a third thermoplastic layer 5 that is colorless and has a wedge-shaped cross-section. In the embodiment depicted in FIG. 5, the second thermoplastic layer 3 is arranged between the first thermoplastic layer 2 and the third thermoplastic layer 5. The wedge angle of the first thermoplastic layer 2 and the wedge angle of the third thermoplastic layer 5 are, in the embodiment depicted in FIG. 5, for example, 0.2 mrad in each case such that the multilayer colored thermoplastic intermediate layer 1 in the embodiment depicted in FIG. 5 has a wedge angle of 0.4 mrad. In the embodiment depicted in FIG. 5, the thickness of the first thermoplastic layer 2 is, for example, 0.33 mm, and the thickness of the third thermoplastic layer 5 is, for example, 0.33 mm, at the thinner end in each case. In the embodiment depicted in FIG. 5, the second thermoplastic layer 3 is, for example, an acoustically damping layer with a thickness of 100 μm, yielding a thickness of the multilayer colored thermoplastic intermediate layer 1 of 0.76 mm at the thinner second end. The first thermoplastic layer 2 and the third thermoplastic layer 5 contain, for example, PVB; and the second thermoplastic layer 3 contains, for example, PVB and plasticizer and a dye.
[0140] FIG. 6 depicts the cross-section of one embodiment of a composite pane 6 according to the invention. This comprises a first pane 7 and a second pane 8 joined to one another via a multilayer colored thermoplastic intermediate layer 1. The multilayer colored thermoplastic intermediate layer 1 is constructed as depicted in FIG. 1 and thus includes a first thermoplastic layer 2 and a second thermoplastic layer 3. In the embodiment depicted in FIG. 6, the first pane 7 and the second pane 8 are, for example, made of soda lime glass and have a thickness in each case of 2.1 mm. However, it is also possible for the first pane 7 and the second pane 8 to have different thicknesses. In the embodiment depicted in FIG. 6, the first pane 7 and the second pane 8 have no wedge angle. However, it is also possible for the first pane 7 and/or the second pane 8 to have a wedge angle, i.e., a wedge-shaped cross-section. In the embodiment depicted in FIG. 6, in the installed position, the first pane 7 is the outer pane, and the second pane 8 is the inner pane of the composite pane 6. However, it is also possible for the first pane 7 to be the inner pane and the second pane 8 to be the outer pane.
[0141] FIG. 7 depicts the cross-section of another embodiment of a composite pane 6 according to the invention. This differs from the embodiment depicted in FIG. 6 only in that the multilayer colored thermoplastic intermediate layer 1 is constructed as depicted in FIG. 4.
[0142] FIG. 8 depicts the cross-section of another embodiment of a composite pane 6 according to the invention. This differs from the embodiment depicted in FIG. 6 only in that the multilayer colored thermoplastic intermediate layer 1 is constructed as depicted in FIG. 5.
[0143] FIG. 9 depicts the cross-section of a projection arrangement 9 according to the invention. The projection arrangement 9 comprises a composite pane 6, in particular the windshield of a passenger car, with an upper edge O and a lower edge U and two side edges not shown in FIG. 9. In the projection arrangement 9 depicted in FIG. 9, the composite pane 6 corresponds to the composite pane depicted in FIG. 6. The projection arrangement 9 further comprises a projector 11, which is aimed at a region B of the composite pane 6. In the region B, which is commonly referred to as the HUD region, images can be generated by the projector 11, which are perceived by a viewer 10 (vehicle driver) as virtual images on the side of the composite pane 6 facing away from him, when his eyes are situated within the so-called eye box E.
[0144] FIG. 10 depicts a flow chart of one embodiment of a method according to the invention for producing a multilayer colored thermoplastic intermediate layer 1 according to the invention.
[0145] The embodiment of a method according to the invention depicted in FIG. 10 comprises, as a first step I, the providing of a colorless first thermoplastic layer 2 with a wedge-shaped cross-section. The providing of the colorless first thermoplastic layer 2 having a wedge-shaped cross-section can be done by extruding a wedge-shaped layer. However, it is also possible for the colorless first thermoplastic layer 2 having a wedge-shaped cross-section to be provided by extruding a colorless thermoplastic layer of constant thickness and subsequent stretching of the layer.
[0146] In a second step II, the embodiment of a method according to the invention depicted in FIG. 10 includes providing a dye-colored second thermoplastic layer 3 having a substantially constant thickness by extrusion.
[0147] The steps I and II can also be carried out in reverse order.
[0148] In a third step III, in the embodiment depicted in FIG. 10 of a method according to the invention, the first thermoplastic layer 2 and the second thermoplastic layer 3 are arranged one above another in a planar manner.
[0149] In a fourth step IV, the embodiment depicted in FIG. 10 of a method according to the invention includes joining the first thermoplastic layer 2 and the second thermoplastic layer 3, at least in an edge region. The joining of the first thermoplastic layer 2 and the second thermoplastic layer 3 at least in an edge region can, for example, be carried out by heating to a temperature above 40° C., for example, 80° C., or by means of a chemical, such as an alcohol, in particular ethanol or isopropanol.
[0150] FIG. 11 depicts a flow chart of another embodiment of a method according to the invention for producing a multilayer colored thermoplastic intermediate layer 1 according to the invention.
[0151] The embodiment depicted in FIG. 11 of a method according to the invention differs from that depicted in FIG. 10 only in that it has the additional step IIa. In step IIa, indentations are embossed in at least one of the surfaces of the first thermoplastic layer 2 and in at least one of the surfaces of the second thermoplastic layer 3. If indentations are in each case embossed in only one surface of the first thermoplastic layer 2 and the second thermoplastic layer 3, the first thermoplastic layer 2 and the second thermoplastic layer 3 are preferably arranged, in step III, one above another in a planar manner such that the embossed surfaces are arranged directly adjacent one another. The embossed indentations improve deaeration in step IV and prevent clouding of the multilayer colored thermoplastic intermediate layer 1.
LIST OF REFERENCE CHARACTERS
[0152] 1 multilayer colored thermoplastic intermediate layer [0153] 2 first thermoplastic layer [0154] 3 second thermoplastic layer [0155] 4 acoustically damping layer [0156] 5 third thermoplastic layer [0157] 6 composite pane [0158] 7 first pane [0159] 8 second pane [0160] 9 projection arrangement [0161] 10 viewer, vehicle driver [0162] 11 projector [0163] B HUD region of the composite pane 6 [0164] E eye box, eye box window [0165] O upper pane edge/upper edge/roof edge of the composite pane [0166] U lower pane edge/lower edge/engine edge of the composite pane
