Optical thin film light filter with high signal-to-noise ratio

• Main Authors: WANG RUISHENG, ZHAO SHUAIFENG, YIN XIAOJUN, CAO YI, GAO PENG, FEI SHUGUO
• Format: Patent
• Language: Chinese; English
• Published: 25.07.2012
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

The utility model belongs to the field of photoselective devices, and in particular relates to an optical thin film light filter with high signal-to-noise ratio. The thin film light filter comprises a light filter body (1) and is characterized in that an all-region membrane layer (2) is plated on a light passing surface of a substrate of the light filter body (1); an extinction dielectric layer (3) is smeared on the side wall of the light filter body (1); a dull black shell is arranged outside the light filter body (1); the dull black shell comprises a shell (4) with an L-shaped longitudinal cross section, and a packaging ring (5); the packaging ring (5) is arranged at the upper part of the shell (4); and the longitudinal cross section of the packaging ring (5) is of an L shape. The thin film light filter with high signal-to-noise ratio, provided by the utility model, has the advantages that transmissivity of a transmission band is high and optical density of a rejection zone is high.