US 12,453,791 B2
Optical filter used in a microbe inactivation processing device
Tatsushi Igarashi, Tokyo (JP)
Assigned to Ushio Denki Kabushiki Kaisha, Tokyo (JP)
Filed by Ushio Denki Kabushiki Kaisha, Tokyo (JP)
Filed on Aug. 9, 2022, as Appl. No. 17/818,492.
Application 17/075,138 is a division of application No. 16/232,571, filed on Dec. 26, 2018, granted, now 10,864,287, issued on Dec. 15, 2020.
Application 17/818,492 is a continuation of application No. 17/075,138, filed on Oct. 20, 2020, granted, now 11,433,151.
Claims priority of application No. 2017-251511 (JP), filed on Dec. 27, 2017.
Prior Publication US 2022/0379137 A1, Dec. 1, 2022
Int. Cl. A61L 2/10 (2006.01); A61N 5/06 (2006.01); G02B 5/20 (2006.01); G02B 5/28 (2006.01)
CPC A61L 2/10 (2013.01) [A61N 5/0624 (2013.01); G02B 5/208 (2013.01); G02B 5/283 (2013.01); A61L 2202/14 (2013.01); A61N 2005/0654 (2013.01); A61N 2005/0659 (2013.01); A61N 2005/0661 (2013.01); A61N 2005/0667 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An optical filter comprising:
a substrate; and
a film disposed on a surface of the substrate,
wherein for light incident on the optical filter at an incident angle of 0° perpendicular to the surface:
the optical filter is configured to transmit at least a part of the light having a wavelength within a range of not lower than 190 nm and not more than 230 nm,
the optical filter is configured to transmit 40% or more of at least a wavelength of the light within a range of more than 230 nm and not more than 237 nm, and
the optical filter is configured to block the light having a wavelength outside of a wavelength range of greater than 190 nm and less than 237 nm.