US 12,372,783 B2
Laminated glazing for projecting an image from a head-up display (HUD)
Tokihiko Aoki, Gosselies (BE)
Assigned to AGC GLASS EUROPE, Louvain-la-Neuve (BE)
Appl. No. 17/780,876
Filed by AGC GLASS EUROPE, Louvain-la-Neuve (BE)
PCT Filed Nov. 25, 2020, PCT No. PCT/EP2020/083419
§ 371(c)(1), (2) Date May 27, 2022,
PCT Pub. No. WO2021/105241, PCT Pub. Date Jun. 3, 2021.
Claims priority of application No. 19212607 (EP), filed on Nov. 29, 2019.
Prior Publication US 2023/0016592 A1, Jan. 19, 2023
Int. Cl. B32B 17/10 (2006.01); G02B 27/01 (2006.01)
CPC G02B 27/0101 (2013.01) [B32B 17/10036 (2013.01); B32B 17/10348 (2013.01); B32B 17/10568 (2013.01); B32B 17/10761 (2013.01); B32B 17/1077 (2013.01); B32B 17/10788 (2013.01); B32B 17/10899 (2013.01); B32B 2307/102 (2013.01); B32B 2307/732 (2013.01); B32B 2457/20 (2013.01); B32B 2605/006 (2013.01); G02B 2027/0194 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A laminated glazing for a head-up display (HUD), comprising:
an outer pane and an inner pane, which are bonded to one another via a thermoplastic intermediate layer,
the laminated glazing having an upper edge (U) and a lower edge (L),
a HUD region (H) wherein a virtual image is generated by a HUD-projector,
wherein the laminated windshield is provided along its edges with a band of enamel (M), with bands of enamel (M1, M2) respectively in the lower edge (L) and the upper edge (U) of the laminated windshield, the enamel band (M1, M2) has each an inner edge (N1,N2) being in contact with a zone free of enamel (F),
a virtual horizontal line (Z1,Z2) respectively parallel to the lower and upper band of enamel (M1, M2) being distant from the inner edges (N1, N2) of the enamel (M1, M2) by a distance Y equal to 50 mm,
vertical course (C) from the upper edge (U) and the lower edge (L) and passing through the HUD region (H),
a virtual point P1 taken at the intersection between the horizontal virtual line (Z1) and the vertical course (C)
a virtual point P2 taken at the intersection between the horizontal virtual line (Z2) and the vertical course (C),
the virtual points P1 and P2 are separated by a virtual vertical line (d) along the vertical course (c) in the zone free of enamel (F),
a thickness of the interlayer has a wedge angle (a) increasing monotonically in the vertical course (c) between the virtual points P1 and P2 with a thickness at P2 point higher than a thickness at P1 point, wherein the intermediate layer along the laminated windshield has a minimum thickness of 900 μm between P1 and P2 in the zone free of enamel (F) area along the vertical course (c),
the thickness profile of the intermediate layer in the vertical course (C) is defined by a series of n values (V) defined by a position (d(n)) and a thickness (Tk(n)) measured from the virtual points P1 to P2 along the virtual line (d) separating the points P1 and P2, to compute a surface area(S), and wherein
the calculated surface area (S) is surrounded by a straight line connecting a first value V1 defined by a position (d(1)) and a thickness (Tk(1)) of the virtual point P1 and a last value V2 defined by a position (d(2)) and a thickness (Tk(2)) of the virtual point P2 and the thickness profile defined by the series of n values (V), and is above 10.000 mm×μm.