Wide field, long focal length, four mirror telescope

Details Wide field, long focal length, four mirror telescope Wide field, long focal length, four mirror telescope

1995-10-20

1997-06-17

Nguyen, Thong

Optical: systems and elements

Mirror

Plural mirrors or reflecting surfaces

359366, 359729, 359731, G02B 1700, G02B 510

Patent

active

056402830

ABSTRACT:
An all reflective telescope system generally includes two spherical mirrors, one mild aspheric mirror and one aspheric mirror all centered about a common telescope axis and imaging on a focal surface for easy manufacture, very long focal length, wide field of view, high resolution, compact volume and low weight particularly well suited for space observations, and in a detailed form includes a sectional concave hyberboloidal primary mirror, a circular mild convex ellipsoidal secondary mirror, a sectional concave spherical tertiary mirror and a sectional convex spherical quaternary mirror for focusing an extended distant object onto a concave cylindrical focal surface having a linear array of charge coupled detectors for high resolution imagery, the telescope having high performance operation near diffraction limits and operating at detector resolution limits.

REFERENCES:
patent: 4189236 (1980-02-01), Hogg et al.
patent: 4598981 (1986-07-01), Hallam et al.
patent: 5142417 (1992-08-01), Brunn
patent: 5144476 (1992-09-01), Kebo
patent: 5410434 (1995-04-01), Shafer

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