Zoom lens system and image-taking apparatus having the same

Details Zoom lens system and image-taking apparatus having the same Zoom lens system and image-taking apparatus having the same

2007-03-20

2007-03-20

Spector, David N. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S683000

Reexamination Certificate

active

11185232

ABSTRACT:
A zoom lens system includes plural optical units each of which includes plural optical elements each having a rotationally asymmetrical surface, and changes optical power as the optical elements in each of the plural optical units move in directions different from an optical axis, wherein the plural optical units have first and second units, and when the optical power of the first unit changes from positive to negative, the second unit changes from negative to positive, wherein a variation range of the optical power of an entire system includes a point where the first and second units have the same optical power, and wherein the point shifts to a side where optical power is greater than a center of the variation range of the optical power of the entire system.

REFERENCES:
patent: 3305294 (1967-02-01), Alvarez
patent: 3583790 (1971-06-01), Baker
patent: 4925281 (1990-05-01), Baker
patent: 5644374 (1997-07-01), Mukaiyama et al.
patent: 6850372 (2005-02-01), Stenton
patent: 7149037 (2006-12-01), Yoshida et al.
patent: 64-35964 (1989-02-01), None
Keisuke Araki,Paraxial Analysis for Off-Axial Optical Systems, Optics Technology Research Laboratories, Canon Inc., 3-30-2, Shimomaruko, Ohta-ku, Tokyo 146-8501.

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