Fast folded wide angle large reflective unobscured system

Details Fast folded wide angle large reflective unobscured system Fast folded wide angle large reflective unobscured system

1992-12-11

1994-07-19

Look, Edward K.

Optical: systems and elements

Mirror

Plural mirrors or reflecting surfaces

359861, G02B 1706, G02B 2306

Patent

active

053314700

ABSTRACT:
A wide angle large reflective unobscured system (10) has a primary (12), secondary (14), tertiary (18) and fold (16) mirror. The primary (12) and secondary (14) mirrors act as a non-reimaging afocal telescope of the Galilean type and relay a virtual entrance pupil to the fold mirror (16) which is positioned at the system aperture stop. The fold mirror (16) directs the energy to the tertiary mirror (18) which acts to direct and focus the energy at a viewing plane. The resulting telescope provides a wide two dimensional field of view which can exceed 20.degree..times.40.degree., and operates at optical speeds about F/1.0.

REFERENCES:
patent: 4240707 (1980-12-01), Wetherell et al.
patent: 4265510 (1981-05-01), Cook
patent: 4598981 (1986-07-01), Hallam et al.
patent: 4733955 (1988-03-01), Cook
patent: 4804258 (1989-02-01), Kebo
patent: 4834517 (1989-05-01), Cook
patent: 5144476 (1992-09-01), Kebo
patent: 5170284 (1992-12-01), Cook

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