Patent · US Expired

Systems of objectives with optical athermalization

US5202792A · kind A · utility

37Cited by
6References
12Claims
0Family size

Assignee

Inventor

Key dates

Filing dateOct 3, 1991
Grant dateApr 13, 1993
Priority date—
Expiry dateOct 3, 2011

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG02B13/14
  • WIPO fieldOptics
  • WIPO sectorInstruments

Abstract

An infrared objective device with optical achromatization and athermalization comprises a front convergent assembly having at least one divergent lens acting as a port and one convergent lens, and a rear divergent assembly comprising at least one divergent lens. These three lenses are chosen so as to be made of three different materials of the type that can be used in the 8 to 12 .mu.m spectral band. They may notably be made, respectively, of germanium, chalcogenide and zinc sulphide.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.