Patent ID: 11971565
Assignee: PTOT (SUZHOU) INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 6:
7. The absorption type near-infrared filter according to claim 1, wherein the difference between the thickness of the first multilayer film and the thickness of the second multilayer film is greater than 3800 nm, and in the ultraviolet band, the difference of 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 falls in the range between 3 nm and 13 nm, and the difference of 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 falls in the range between −15 nm and 0 nm.