Two-mirror systems for periscopic rearward viewing

Details Two-mirror systems for periscopic rearward viewing Two-mirror systems for periscopic rearward viewing

1975-05-21

1977-07-05

Evans, F. L.

350294, 350301, 350320, G02B 510

Patent

active

040336786

ABSTRACT:
An optical system comprised of two cylindrically concave mirrors provides an advantageous rearward viewing device. Light rays from the object field to the rear proceed to a first mirror at the side of or above the observer, then to a second mirror forward of the observer, and then to the eyes of the observer. The mirror orientations and shapes are so determined as to produce cooperatively a suitably sharp, undistorted, and unreversed view to the rear over a usefully large angular extent. Comfortable binocular vision is obtainable along with latitude for movement of the observer's head. The system is particularly suited for use as a rearview periscope for vehicles. Examples of its use are given, along with procedures for determining the system designs which are applicable to a wide range of installation requirements.

REFERENCES:
patent: 1785347 (1930-12-01), Herrschaft
patent: 2193217 (1940-03-01), Allen
patent: 2296943 (1942-09-01), Okolicsany
patent: 2942522 (1960-06-01), Merriam
patent: 3224330 (1965-12-01), Kompfner
patent: 3353893 (1967-11-01), Bamberger et al.
patent: 3762794 (1973-10-01), Arnaud

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