THREE-MIRROR OPTICAL SYSTEM WITHOUT SCREENING Russian patent published in 2008 - IPC G02B17/06 

FIELD: physics.

SUBSTANCE: three-mirror system is off-axis and decentralises on the aperture as well as on the field angle, and consists of mirrors, formed by rotational surfaces with a common axis. The reflecting surface of the primary mirror is a segment of a concaved hyperboloid with focal power, close to that of the whole system. The secondary mirror has a convex spherical shape. The reflecting surface of the tertiary mirror is a segment of a concave flattened ellipsoid. The distance between the primary and the secondary mirrors is less than the focal distance of the primary mirror. The centres of the reflecting surfaces of all mirrors are at the top of a triangle, the plane of which includes a common axis for the mirrors, and from different sides relative this axis. The top of the primary and tertiary mirrors is combined. To simplify construction and adjustment, the lateral and rear surfaces of the primary and tertiary mirrors rest of common support surfaces. All mirrors can be made from material with high radiation-optical resistance to the effect of cosmic radiation of high power.

EFFECT: simple construction and adjustment of a mirror system without screening.

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