Unit magnification relay systems

Details Unit magnification relay systems Unit magnification relay systems

1979-10-15

1981-06-09

Henry, Jon W.

350 45, 350 55, G02B 1708

Patent

active

042721520

ABSTRACT:
The radii of two concave and two convex mirrors have the same absolute value. The two concave mirrors are placed back to back and have a central aperture. The two convex mirrors face the concave mirrors and also have a central aperture. An image at the apex of one of the convex mirrors will be imaged at unit magnification at the vertex of the other convex mirror if the spacing between the concave and convex mirrors is 0.866 times the absolute value of their radius. This system is corrected for all aberrations except astigmatism. Astigmatism is corrected by a double convex thin lens at the intermediate image at the vertices of the concave mirrors. Petzval curvature introduced by the field lens may be corrected by plano-concave lenses near the object and image planes. Alternatively identical shell lenses may be placed on either side of the intermediate image to correct for both astigmatism and Petzval curvature. The lenses may be achromatic doublets to correct for chromatic variation of field aberrations. The mirrors may be formed on the outer surfaces of transparent objects for stability and convenience. High indices of refraction of the transparent objects increase the f number speed of the systems.

REFERENCES:
patent: 3206603 (1965-09-01), Mauro
patent: 3244073 (1966-04-01), Bollwers et al.
patent: 3274886 (1966-09-01), Rosin
patent: 3455623 (1969-07-01), Harris
patent: 3748015 (1973-07-01), Offner
Rosin, Seymour, "Inverse Cassegrainian Systems", Applied Optics, vol. 7, No. 8, pp. 1483-1497.

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