Laminated glass and head-up display system
A laminated glass includes a first glass plate, a second glass plate, and an interlayer disposed between the first glass plate and the second glass plate to bond the first glass plate and the second glass plate; the laminated glass partly having a first area configured to be used by a head-up display; the first glass plate having a 4th surface disposed on an opposite side of the interlayer, and a 3rd surface facing the interlayer; the second glass plate having a 2nd surface facing the interlayer and a 1st surface disposed on an opposite side of the interlayer; the first area having a P-polarized light reflective layer disposed on the 4th surface and a light-absorbing layer disposed at a position closer to the 1st surface than the P-polarized light reflective layer; the laminated glass being configured such that the formula of A≥85% is satisfied wherein the total of a visible light transmittance of the P-polarized light reflective layer and a visible light transmittance of the light-absorbing layer is Tv %, the total of a visible light reflectance of the P-polarized light reflective layer and a visible light reflectance of the light absorbing layer is Rv %, and an absorption A is equal to “100−Tv−Rv” (%); and the laminated glass being configured such that the formula of Rvp≥5% is satisfied wherein the total of a P-polarized light reflectance of the P-polarized light reflective layer and a P-polarized light reflectance of the light-absorbing layer is Rvp % when P-polarized light is incident on the surface of the laminated glass facing the P-polarized light reflective layer at an incident angle of 57 deg.
1 . A laminated glass comprising:
a first glass plate, a second glass plate, and an interlayer disposed between the first glass plate and the second glass plate to bond the first glass plate and the second glass plate;
the laminated glass partly having a first area configured to be used by a head-up display;
the first glass plate having a 4th surface disposed on an opposite side of the interlayer, and a 3rd surface facing the interlayer;
the second glass plate having a 2nd surface facing the interlayer and a 1st surface disposed on an opposite side of the interlayer;
the first area having a P-polarized light reflective layer disposed on the 4th surface and a light-absorbing layer disposed at a position closer to the 1st surface than the P-polarized light reflective layer; and
the laminated glass being configured such that the formula of A≥85% is satisfied wherein the total of a visible light transmittance of the P-polarized light reflective layer and a visible light transmittance of the light-absorbing layer is Tv %, the total of a visible light reflectance of the P-polarized light reflective layer and a visible light reflectance of the light absorbing layer is Rv %, and an absorption A is equal to “100−Tv−Rv” (%); and
the laminated glass being configured such that the formula of Rvp≥5% is satisfied wherein the total of a P-polarized light reflectance of the P-polarized light reflective layer and a P-polarized light reflectance of the light-absorbing layer is Rvp % when P-polarized light is incident on the surface of the laminated glass facing the P-polarized light reflective layer at an incident angle of 57 deg.
2 . The laminated glass according to claim 1 , wherein the laminated glass is configured such that the formula of a*≤10 and the formula of b*≤10 are satisfied wherein light reflected on the P-polarized light reflective layer and on the light-absorbing layer has a chromaticity of a*, b* when the P-polarized light is incident on the P-polarized light reflective layer at an incident angle of 57 deg.
3 . The laminated glass according to claim 1 , wherein the light-absorbing layer is disposed on the 2nd surface.
4 . The laminated glass according to claim 3 , wherein the 2nd surface has an optically shielding layer disposed thereon in a strip form along a peripheral edge portion thereof; and
wherein the optically shielding layer is partly widened so as to form the light-absorbing layer.
5 . The laminated glass according to claim 1 , wherein the light-absorbing layer comprises a colored ceramic layer.
6 . The laminated glass according to claim 1 , wherein the first glass plate is curved so as to be convex toward the interlayer.
7 . The laminated glass according to claim 1 , wherein at least one of the first glass plate, the second glass plate or the interlayer has a wedge-shaped area in cross section such that the wedge-shaped area has a thickness gradually increasing from a lower side to an upper side of the laminated glass in a state that the laminated glass is mounted to a vehicle.
8 . The laminated glass according to claim 7 , wherein the wedge-shaped area in cross section includes a second area configured to be used by the head-up display.
9 . A head-up display system comprising:
the laminated glass recited in claim 1 , comprising a light source emitting P-polarized visible light such that the P-polarized visible light is incident on the P-polarized light reflective layer;
wherein a ghost image is apparently displayed on a vehicle outer side of the laminated glass.
10 . The head-up display system according to claim 9 , configured such that light from the light source is incident on the P-polarized light reflective layer at an incident angle larger than 57 deg.
11 . The head-up display system according to claim 9 , configured such that light from the light source is incident on the P-polarized light reflective layer at an incident angle of at most 47 deg, or at least 62 deg.