Variable magnification infrared objective lens assembly

Details Variable magnification infrared objective lens assembly Variable magnification infrared objective lens assembly

1985-09-13

1986-12-30

Corbin, John K.

350427, G02B 1314, G02B 1515

Patent

active

046324984

ABSTRACT:
An infrared objective lens assembly comprises a four-component zoom system (25) which accepts from object space (22) radiation in the infrared waveband, and a one-component collecting system (26) which forms a real image (24) of that radiation. The components of the zoom (25) and collecting (26) systems are formed by lens elements (D,E,F,G,H,I) such that with respect to the collecting system (26) the first (E) and third (H,G) components of the zoom system (25) are mounted on a common carriage (41) and are selectively positionable along the optical axis (21) whereas the second (F) and fourth (I) components of the zoom system (25) are fixedly positioned on the optical axis (21) whereby the zoom system (25) is optically-compensated and of variable effective focal length. The fourth (I) zoom system component is formed by a lens element having an aspheric refractive surface (17) but the refractive surfaces (9-16) of all other lens elements (E,F,GH) of the zoom system (25) are non-aspheric.

REFERENCES:
patent: 2908199 (1959-10-01), Kaprelian
patent: 3947084 (1976-03-01), Noyes
patent: 4148548 (1979-04-01), Thompson
patent: 4196968 (1980-04-01), Itoh
patent: 4469396 (1984-09-01), Neil

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