AN INFRARED LENS

摘要

The present invention relates to an infrared lens which is coated with an optical film. The substrate (2) is made of germanium material, the first film (3) coated on the substrate (2) is made of zinc sulfide material, the second film (4) is made of germanium material, the third film (5) is made of zinc sulfide material, the fourth film (6) is made of ytterbium fluoride material and the fifth film (7) is made of zinc sulfide material on the lens (1).