Optical system for infrared camera

Details Optical system for infrared camera Optical system for infrared camera

1997-11-13

1999-06-01

Spyrou, Cassandra

Optical: systems and elements

Having significant infrared or ultraviolet property

Lens, lens system or component

359781, 359747, G02B 1314

Patent

active

059093072

ABSTRACT:
An optical system for use in an infrared camera which includes, in order from an object side: a first lens group having a negative refractive power and a second lens group having a positive refractive power arranged a distance from the first lens group. The first lens group comprises a negative meniscus lens having a convex surface facing toward the object side and the second lens group comprising, in order from the object side: a first lens having a positive refractive power, a second lens having a negative refractive power and a third lens having a positive refractive power. The lenses comply with the following conditions: (1) 0.5.PHI.<-.PHI.f<0.7.PHI., (2) 0.55.PHI.<.PHI.r<0.87.PHI., (3) 1.55 (1/.PHI.)<d<1.98 (1/.PHI.) and (4) dr<2.1 (1/.PHI.). The conditions are defined by: .PHI.: is the overall refractive power for the overall optical system for the infrared camera, .PHI.f: is the refractive power for the first lens group, .PHI.r: is the refractive power for the second lens group, d: is the distance between principal points of the first and second lens groups and dr: is the lens separation between the most objectwise lens surface and the most imagewise lens surface in the second lens group. The first and second lens groups are made up of lenses which contain silicon or germanium.

REFERENCES:
patent: 4738518 (1988-04-01), Hilbert et al.
patent: 4781449 (1988-11-01), Hirakawa et al.

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