US 11,994,709 B2
Optical member, and backlight unit and image display device using said optical member
Takahiro Yoshikawa, Ibaraki (JP); Daisuke Hattori, Ibaraki (JP); Ryota Morishima, Ibaraki (JP); and Atsushi Kishi, Ibaraki (JP)
Assigned to NITTO DENKO CORPORATION, Ibaraki (JP)
Appl. No. 17/914,043
Filed by NITTO DENKO CORPORATION, Ibaraki (JP)
PCT Filed Mar. 25, 2021, PCT No. PCT/JP2021/012444
§ 371(c)(1), (2) Date Sep. 23, 2022,
PCT Pub. No. WO2021/193789, PCT Pub. Date Sep. 30, 2021.
Claims priority of application No. 2020-055923 (JP), filed on Mar. 26, 2020.
Prior Publication US 2023/0152509 A1, May 18, 2023
Int. Cl. F21V 8/00 (2006.01)
CPC G02B 6/0055 (2013.01) 15 Claims
OG exemplary drawing
 
1. An optical member, comprising:
a light guide plate having an end surface that light from a light source enters and an emitting surface from which the entered light is emitted; and
a reflective plate bonded to a side of the light guide plate opposite to the emitting surface via a double-sided pressure-sensitive adhesive film,
wherein the double-sided pressure-sensitive adhesive film includes a first pressure-sensitive adhesive layer, a low-refractive index layer, and a second pressure-sensitive adhesive layer from a light guide plate side,
wherein the optical member further comprises a surface-treated layer formed on a side of the reflective plate opposite to the double-sided pressure-sensitive adhesive film, and
the first pressure-sensitive adhesive layer has a storage modulus of elasticity of 1.2×105 (Pa) or more and the second pressure-sensitive adhesive layer has a storage modulus of elasticity of 9.0×104 (Pa) or less.