Abstract: An absorption type near-infrared filter comprising a first multilayer film, a second multilayer film, and an absorption film, wherein in the ultraviolet band, the difference of between the wavelength with the transmittance at 80% of the absorbing film and the wavelength with the reflectivity at 80% of the first multilayer film falls in the range between 25 nm and 37 nm, the difference of between the wavelength with the transmittance at 50% of the absorbing film and the wavelength with the reflectivity at 50% of the first multilayer film falls in the range between 6 nm and 14 nm, and the difference of between the wavelength with the transmittance at 20% of the absorbing film and the wavelength with the reflectivity at 20% of the first multilayer film falls in the range between ?6 nm and 2.5 nm.
Type:
Grant
Filed:
May 26, 2022
Date of Patent:
April 30, 2024
Assignees:
PTOT (SUZHOU) INC., PLATINUM OPTICS TECHNOLOGY INC.
Inventors:
Chung-Han Lu, Hsiao-Ching Shen, Chun-Cheng Hsieh, Ming-Zhan Wang
Abstract: An absorption type near-infrared filter comprising a first multilayer film, a second multilayer film, and an absorption film, wherein in the ultraviolet band, the difference of between the wavelength with the transmittance at 80% of the absorbing film and the wavelength with the reflectivity at 80% of the first multilayer film falls in the range between 25 nm and 37 nm, the difference of between the wavelength with the transmittance at 50% of the absorbing film and the wavelength with the reflectivity at 50% of the first multilayer film falls in the range between 6 nm and 14 nm, and the difference of between the wavelength with the transmittance at 20% of the absorbing film and the wavelength with the reflectivity at 20% of the first multilayer film falls in the range between ?6 nm and 2.5 nm.
Type:
Application
Filed:
May 26, 2022
Publication date:
September 8, 2022
Applicants:
PTOT (SUZHOU) INC., PLATINUM OPTICS TECHNOLOGY INC.
Inventors:
Chung-Han LU, Hsiao-Ching SHEN, Chun-Cheng HSIEH, Ming-Zhan WANG
Abstract: An absorption type near-infrared filter comprising a first multilayer film, a second multilayer film, and an absorption film comprising an infrared absorbing dye with a weight percentage between 1% and 3%, wherein in the infrared band, the difference between the wavelength with the transmittance at 80% of the absorption film and the wavelength with the reflectivity at 80% of the first multilayer film ranges between 130 nm and 145 nm; the difference between the wavelength with the transmittance at 50% of the absorption film and the wavelength with the reflectivity at 50% of the first multilayer film ranges between 75 nm and 90 nm; the difference between the wavelength with the transmittance at 20% of the absorption film and the wavelength with the reflectivity at 20% of the first multilayer film ranges between 25 nm and 45 nm.
Type:
Grant
Filed:
December 18, 2018
Date of Patent:
July 5, 2022
Assignees:
PTOT (SUZHOU) INC., PLATINUM OPTICS TECHNOLOGY INC.
Inventors:
Chung-Han Lu, Hsiao-Ching Shen, Chun-Cheng Hsieh, Ming-Zhan Wang