US 12,449,581 B2
Polarizing plate, method of manufacturing the same and optical apparatus
Tomu Takeda, Shimotsuke (JP)
Assigned to DEXERIALS CORPORATION, Tochigi (JP)
Appl. No. 17/999,537
Filed by DEXERIALS CORPORATION, Tochigi (JP)
PCT Filed May 21, 2021, PCT No. PCT/JP2021/019368
§ 371(c)(1), (2) Date Nov. 21, 2022,
PCT Pub. No. WO2021/241439, PCT Pub. Date Dec. 2, 2021.
Claims priority of application No. 2020-090347 (JP), filed on May 25, 2020.
Prior Publication US 2023/0204840 A1, Jun. 29, 2023
Int. Cl. G02B 5/30 (2006.01); G02B 1/14 (2015.01); G02F 1/1335 (2006.01)
CPC G02B 5/3058 (2013.01) [G02B 1/14 (2015.01); G02B 5/3066 (2013.01); G02F 1/133548 (2021.01)] 17 Claims
OG exemplary drawing
 
1. A polarizing plate having a wire grid structure, comprising:
a transparent substrate; and
a plurality of protrusions formed on a first surface of the transparent substrate, extending in a first direction, and periodically arranged apart from each other at a pitch shorter than a wavelength of light in a use band, wherein each of the plurality of protrusions includes a reflective layer, a dielectric layer, and an absorption layer in order from the transparent substrate, wherein a top surface and a side surface of each of the plurality of protrusions are coated with a protective film made of a dielectric material, and wherein the protective film has a cross-sectional area that gradually increases from a top surface side to a transparent substrate side when viewed from a cross section obtained by cutting the protrusion along a plane perpendicular to a surface of the transparent substrate and perpendicular to the first direction.