Dual field of view catadioptric optical system

Details Dual field of view catadioptric optical system Dual field of view catadioptric optical system

1987-02-27

1989-10-31

Arnold, Bruce Y.

G02B 1502, G02B 2304

Patent

active

048773174

ABSTRACT:
A dual field of view catadioptric optical system is disclosed which includes a narrow field of view (FOV) and a wide FOV. The narrow field of view includes an apertured stationary primary reflector and a secondary reflector which may be pivoted into a common optical path for blocking radiant energy for the wide field of view during operation in the narrow field of view and pivoted out of the common optical path for operation in the wide field of view. In another embodiment, the secondary reflector is replaced by a transparent/reflector which is always located in the common optical path. The element is transparent to radiant energy until heated at which time it becomes reflective. Thus, when transparent, the system operates in the wide field of view mode and when reflective, the system operates in the narrow field of view mode.

REFERENCES:
patent: 4283113 (1981-08-01), Eden

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