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

Claim 9:
10. 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 less than 1000 nm, in the infrared band, the difference of between the wavelength with the transmittance at 80% of the infrared absorption film and the wavelength with the reflectivity at 80% of the first multilayer film falls in the range between 130 nm and 137 nm, the difference of between the wavelength with the transmittance at 50% of the infrared absorption film and the wavelength with the reflectivity at 50% of the first multilayer film falls in the range between 77 nm and 85 nm, and the difference of between the wavelength with the transmittance at 20% of the infrared absorption film and the wavelength with the reflectivity at 20% of the first multilayer film falls in the range between 30 nm and 42 nm.