Zoom optical system

Details Zoom optical system Zoom optical system

2006-06-27

2008-11-04

Choi, William C (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S672000, C359S689000

Reexamination Certificate

active

07446946

ABSTRACT:
At least one exemplary embodiment is directed to a zoom optical system which includes a plurality of optical groups with variable optical power arranged along an optical axis; and at least one optical group arranged along the optical axis, and where the system is zoomed by changing the power of at least one of the plurality of the optical groups with variable optical power, where the plurality of the optical groups with variable optical power each includes a rotationally asymmetric surface and each has a plurality of optical devices, which change the power within the respective optical groups by moving the respective optical devices in a direction different from the optical axis, and the system at a telephoto end satisfies the condition: |φdt|≦|φst|, where |φdt| is the absolute value of the power total sum of a plurality of the optical groups with variable optical power, and |φst| is the absolute value of the power total sum of the at least one optical group.

REFERENCES:
patent: 3305294 (1967-02-01), Alvarez
patent: 3583790 (1971-06-01), Baker
patent: 6850372 (2005-02-01), Stenton
patent: 02-119103 (1990-05-01), None
Keisuke Araki, “Paraxial Analysis for Off-Axial Optical Systems”, Japanese Journal of Optics, vol. 29, No. 3, 2000.

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