Image forming optical system

Details Image forming optical system Image forming optical system

1976-07-01

1978-06-27

Clark, Conrad J.

G02B 510

Patent

active

040971252

ABSTRACT:
An optical system for forming an image of an object with extremely small aberrations at unit magnification including a concave mirror and a convex mirror having a smaller radius of curvature than that of the concave mirror and arranged in face-to-face relation to the concave mirror. To minimize the difference between the absolute values of inclination angle of the sagittal image surface and meridional image surface with respect to a common plane parallel to the optical axis at points of intersection therebetween, that is, at points where the astigmatic difference is zero, the center of the convex mirror is spaced from that of the concave mirror toward the concave mirror, whereby a light ray from an object located at a height dependent upon the axial separation between the concave and convex mirrors is reflected from the concave mirror to the convex mirror, then therefrom reflected to the concave mirror and then therefrom reflected again to form an image having a high resolution over a wide range of image width.

REFERENCES:
patent: 2684015 (1954-07-01), Grey
patent: 3748015 (1973-07-01), Offner

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