Optical system having a dual field of view

Details Optical system having a dual field of view Optical system having a dual field of view

1980-11-10

1982-10-19

Corbin, John K.

350443, 350444, G02B 1708

Patent

active

043547427

ABSTRACT:
An optical system having a dual field of view. The system includes a wide-angle objective comprising a lens, a concave primary mirror, and a movable convex secondary mirror having a first position and a second position. When in the first position, the secondary mirror permits the wide-angle objective to focus radiation. When in the second position, the secondary mirror prevents radiation from being focused by the wide-angle objective. The combination of the secondary mirror when in the second position and the primary mirror comprise a narrow-angle objective with the primary mirror converging radiation to the secondary mirror and the secondary mirror focusing radiation. Thus, the optical system has a wide-angle field of view whenever the secondary mirror is in the first position and a narrow-angle field of view whenever the secondary mirror is in the second position.

REFERENCES:
patent: 2761072 (1956-08-01), Wormser
patent: 2798961 (1957-07-01), Wormser
patent: 2798962 (1957-07-01), Wormser
patent: 3829192 (1974-08-01), Wheeler
patent: 3881103 (1975-04-01), Menke et al.
patent: 3941923 (1976-03-01), Wheeler

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