Downsize, high performance, and wide range magnification...

Details Downsize, high performance, and wide range magnification... Downsize, high performance, and wide range magnification...

2008-05-27

2008-05-27

Hasan, M. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S684000, C359S693000

Reexamination Certificate

active

07379249

ABSTRACT:
A zoom lens includes a first lens band having a positive focal length, a second lens band having a negative focal length, and at least third to fifth lens bands having positive focal lengths. An aperture diaphragm is located in the vicinity of the third lens band. When magnification i.e., zooming is performed from short to long focal point ends, the second lens band smoothly moves toward the third lend band and the fourth lens band simultaneously moves from the fifth lens band side toward a long focal point end so as to shear a magnification function together with the second lens band.

REFERENCES:
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patent: 5610766 (1997-03-01), Aoki et al.
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Office Action of the Japanese Patent Office, JP 2000-352498.
Office Action of the Japanese Patent Office, JP 2001-037445.

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