Variable-magnification image-forming optical system

Details Variable-magnification image-forming optical system Variable-magnification image-forming optical system

1997-11-26

1999-10-05

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359683, 359686, 359687, 359688, 359729, 396379, 396382, G02B 1514, G02B 1700, G03B 1306, G03B 1310

Patent

active

059633760

ABSTRACT:
A variable-magnification image-forming optical system having at least four lens units including a decentered optical system. The decentered optical system has at least one curved surface with a rotationally asymmetric surface configuration having no axis of rotational symmetry in nor out of the surface. Rotationally asymmetric aberrations due to decentration are corrected by the rotationally asymmetric surface configuration. A magnification change is effected by changing at least one of the spacings between the four lens units.

REFERENCES:
patent: 3810221 (1974-05-01), Plummer
patent: 3836931 (1974-09-01), Plummer
patent: 4650292 (1987-03-01), Baker et al.
patent: 4804835 (1989-02-01), Ando
patent: 4925281 (1990-05-01), Baker
patent: 5274406 (1993-12-01), Tejima et al.

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