Optical System

Details Optical System Optical System

1998-05-13

1999-10-19

Nguyen, Thong

Optical: systems and elements

Compound lens system

Variable magnification

359353, 359365, 359421, G03B 1306, G02B 1700

Patent

active

059698608

ABSTRACT:
A dual field optical system [20] comprises an objective [A, B,] which forms an intermediate image [10] and a relay [E, F,] which transfers radiation to a focal plane [12]. The objective [A, B] comprises a primary mirror [A] and a secondary mirror [B] arranged in the form of a Cassegrain system and is rendered dual-field by the provision of an alternative primary mirror [A.sup.1 ] which is axially movable between in-use and out-of-use positions. The primary mirror [A] forms part of a housing [J] for a linear actuator [15] which is connected by co-axial rods [14] to the alternative primary mirror [A.sup.1 ] so that the system is both compact and of low mass due to symmetry.

REFERENCES:
patent: 4877317 (1989-10-01), Gibbons et al.
patent: 5113281 (1992-05-01), Mandelboum et al.
patent: 5161051 (1992-11-01), Whitney et al.
patent: 5734496 (1998-03-01), Beach

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