High aperture catoptric system

Details High aperture catoptric system High aperture catoptric system

1975-02-18

1976-11-30

Sacher, Paul A.

G02B 1702

Patent

active

039945731

ABSTRACT:
A catoptric system adapted for X-ray fluoroscopic photography comprises a spherical concave reflector disposed to reflect fluorescence light coming from the object plane to a field flattener of positive power positioned in front of a photographic film. In one embodiment of the invention, the reflector is constituted by a negative meniscus lens having a primary surface facing the object plane and with the secondary surface being mirrored. In order to facilitate minimization of the reflector diameter, there is provided a positive meniscus lens, having a concave surface facing the object plane, positioned between the reflector and field flattener to thereby assist in converging the rays of light from the object plane before impingement on the reflector.

REFERENCES:
patent: 2739257 (1956-03-01), Sheldon
patent: 3191497 (1965-06-01), Matsui

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