Patent ID: 6018414
Filing Date: 2000-01-25
Classification: G08B

Abstract:
An infrared lens assembly operative in the near and far infrared wavebands, comprising:a focusing component positioned along an optical axis to receive infrared radiation, the focusing component comprising at least one focusing lens formed from a material that has a minimal change in Abbe V-number between the far and near infrared wavebands;a collecting component positioned along the optical axis in optical communication with the focusing component, the collecting component comprising at least one collecting lens formed from the material;a diffracting component positioned along the optical axis in optical communication with the focusing and collecting components, the diffracting component comprising at least one diffractive surface to correct color aberrations associated with an infrared waveband; andthe focusing and collecting components cooperating with the diffracting component to focus infrared radiation at an image plane of an infrared detector.