ATHERMALIZED INFRARED LENS MODULE

摘要

PURPOSE: An undegraded infrared lens module is provided to minimize a focal distance in a wide temperature range using an array structure of a lens of germanium material and a lens of zinc selenide material. CONSTITUTION: A first optic(L1) is made of zinc selenide material. A second lens(L2) is made of germanium material. A third lens(L3) is made of zinc selenide material. The three lenses minimize a focal distance in a wide temperature range. Refraction faces(D1,D2) are formed in the first lens and the third lens in which chromatic aberration is easily generated and a refractive index is high. The chromatic aberration is improved.