Absorption formula optical low pass filter

The utility model discloses an absorption formula optical low pass filter, including quartzy substrate, one side of quartzy substrate is equipped with the glue coated layer that has visible light absorption characteristic on the surface, is equipped with antireflection film layer on the glue coated layer, the opposite side of quartzy substrate is equipped with infraredly by the rete on the surface. The utility model discloses an adoption sets up the glue coated layer on quartzy substrate, overcome that blue glass combination quartz plate constitutes that optical low pass filter brought was with high costs, the inefficiency is difficult to shortcomings such as miniaturation, has the advantage that the angle interdependence is little when eliminating moire fringe. 本实用新型公开了种吸收式光学低通滤波器，包括水晶基片，所述水晶基片的侧表面上设有具有可见光吸收特性的涂覆胶层，涂覆胶层上设有减反射膜层，所述水晶基片的另侧表面上设有红外截止膜层。本实用新型通过采用在水晶基片上设置涂覆胶层，克服了蓝玻璃组合水晶片构成的光学低通滤波器所带来的成本高，效率低，难以微型化等缺点，消除莫尔条纹的同时具有角度依存性小的优点。