Optical system

Details Optical system Optical system

1997-02-19

1999-09-14

Nguyen, Thong

Optical: systems and elements

Compound lens system

Variable magnification

359365, 359421, G03B 1306, G02B 1700, G02B 2300

Patent

active

059531550

ABSTRACT:
An optical system having a selected one of a pair of fields of view. The optical system includes a primary reflector; a secondary reflector; a refractive optical system; and a drive. The drive orients the secondary reflector to a first region in optical alignment with the primary reflector to provide the optical system with one of the pair of fields of view and for reorienting the secondary reflector to a second region out of optical alignment with the primary reflector and orienting the refractive optical system at the first region to provide a refractive optical system with a second one of the pair of fields of view. The optical system includes a detector and a second refractive optical system disposed between the first region and the detector. The detector comprises an array of detector elements. A processor is provided for processing energy from pixels formed by plurality of detector elements having a smaller area when the energy is directed through the secondary reflector than when the energy is directed through the first-mentioned refractive optical system. The secondary reflector and the first-mentioned refractive optical system are mounted to a common support and the drive rotates the support to orientated and reorient the secondary reflector.

REFERENCES:
patent: 4354742 (1982-10-01), Abel et al.
patent: 4366377 (1982-12-01), Notthopp et al.
patent: 4877347 (1989-10-01), Gibbons et al.
patent: 5113281 (1992-05-01), Mandelboum et al.
patent: 5229880 (1993-07-01), Spencer et al.

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