Light guide plate
Provided is a light guide plate which, when used as a light guide plate of a glasses-type device such as a wearable device for AR/MR, is capable of enhancing color reproducibility of an image. A light guide plate 10 includes a glass plate 1 , and a resin layer 2 formed at a main surface of the glass plate 1 . The difference in Abbe number νd between the glass plate 1 and the resin layer 2 is less than 10. The refractive indices nd of the glass plate 1 and the resin layer 2 are 1.7 or greater and the difference between the refractive indices nd is 1.0 or less.
1 . A light guide plate comprising:
a glass plate; and
a resin layer formed at a main surface of the glass plate, wherein
a difference in Abbe number vd between the glass plate and the resin layer is less than 10,
refractive indices nd of the glass plate and the resin layer are 1.7 or greater and a difference between the refractive indices nd is 1.0 or less,
the main surface of the glass plate has a surface roughness Ra of 5 nm or less, and
the glass plate comprises as a glass composition, in terms of mass %, 1% to 45% of SiO 2 , 0% to 10% of B 2 O 3 , 0% to 60% of La 2 O 3 , 0% to 40% of Nb 2 O 3 , 0% to 20% of Gd 2 O 3 , 0% to 10% of Y 2 O 3 , 5% to 40% of TiO 2 , and 1% to 10% of ZrO 2 .
2 . The light guide plate according to claim 1 , wherein
the glass plate has a thickness of from 0.1 mm to 1 mm and the resin layer has a thickness of 1 μm or less.
3 . The light guide plate according to claim 1 , wherein
the light guide plate has an internal transmittance of 70% or greater at a wavelength of from 450 nm to 650 nm when the glass plate has a thickness of 10 mm.
4 . The light guide plate according to claim 1 , wherein
a difference between external transmittances at wavelengths of 450 nm and 650 nm of the light guide plate is 5% or less.
5 . The light guide plate according to claim 1 , wherein
an uneven structure is formed at a surface of the resin layer.
6 . The light guide plate according to claim 1 , wherein
the resin layer is made of a photocurable resin.
7 . A wearable device for AR/MR, the wearable device comprising the light guide plate according to claim 1 .
8 . The light guide plate according to claim 1 , wherein the resin layer has a first surface and a second surface opposite the first surface, the first surface being in contact with the main surface of the glass plate and the second surface having a square-wave shape.
9 . The light guide plate according to claim 1 , wherein
the resin layer comprises a first resin layer and a second resin layer,
the first resin layer is located at a first end of the glass plate and is configured to diffract incident light and pass the diffracted incident light into the glass plate, and
the second resin layer is located at a second end of the glass plate opposite to the first end of the glass plate and configured to further diffract the diffracted incident light exiting from the glass plate.