Optical focusing system with two ellipsoidal mirrors

Details Optical focusing system with two ellipsoidal mirrors Optical focusing system with two ellipsoidal mirrors

1979-05-16

1980-12-16

Henry, Jon W.

G02B 510

Patent

active

042393426

ABSTRACT:
An optical focusing system having two mirrors with reflecting surfaces in the shape of ellipsoids of revolution. They are positioned relative to each other so that the second mathematical focal point of the first ellipsoid coincides with the first mathematical focal point of the second ellipsoid, counting the focal points in the direction of passage of the light, and the entrance pupil of the system lies at the first mathematical focal point of the first ellipsoid. The ratio of the length of the major axis to the length of the minor axis of the second ellipsoid is selected so that the isoplanasie condition for elimination of coma of third order is satisfied.

REFERENCES:
patent: 2819649 (1958-01-01), McLeod et al.
patent: 2944156 (1960-07-01), Davy et al.

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