Patent ID: 11874484
Assignee: DEXERIALS CORPORATION
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A polarizing plate having a wire grid structure, the polarizing plate comprising:
a transparent substrate;
grid protrusions provided over the transparent substrate, arranged in an array having a pitch shorter than a wavelength of light in a band to be used, and extending in a predetermined direction; and
a protective film made of a dielectric material and covering a surface of the polarizing plate, the surface being configured to receive incident light,
the grid protrusions having a reflective layer, a first dielectric layer, an absorptive layer, and a second dielectric layer that are disposed in this order in a direction away from the transparent substrate, and
the reflective layer having a width that is smaller than each of a width of the first dielectric layer, a width of the second dielectric layer, and a width of the absorptive layer,
wherein the width of the first dielectric layer, the width of the second dielectric layer, and the width of the absorptive layer are substantially equal to one another,
wherein an absorption axis reflectance of the polarizing plate is minimized in the wavelength of light in the band to be used,
wherein the first dielectric layer, the second dielectric layer, and the absorptive layer each have a thickness such that, in response to the width of the reflective layer being equal to the width of the first dielectric layer, the width of the second dielectric layer, and the width of the absorptive layer, the absorption axis reflectance of the polarizing plate is minimized in a wavelength shorter than the wavelength of light in the band to be used, and
wherein a surface of the second dielectric layer is in contact with the protective film.