High magnification compact zoom lens

Details High magnification compact zoom lens High magnification compact zoom lens

2011-06-21

2011-06-21

Spector, David N (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000

Reexamination Certificate

active

07965452

ABSTRACT:
The present invention is directed to high magnification compact zoom lenses that are reduced in diameter of groups of lens pieces closer to the imaging plane to provide downsized lightweight zoom lenses of magnification as high as 20 diameters, with an image stabilizer or vibration compensating mechanism being also reduced in dimensions. An exemplary improved high magnification zoom lens has four groups of lens pieces, namely, the first or leading lens group G1of positive refractivity in the foremost position closer to the subject, the second lens group G2of negative refractivity, the third lens group G3of positive refractivity, and the fourth lens group G4of positive refractivity in the rearmost position closer to the imaging plane, all arranged in this order. In displacing the entire lens optics of the zoom lens from the wide-angle end to the telephoto end, the second lens group G2are moved toward the imaging plane and the fourth lens group G4are moved to compensate for a varied position of the resultant image while the first and third lens groups, G1and G3, have their respective positions fixed along the optical axis. The zoom lens satisfies the requirements as defined in the following formulae: f3/f4>2.0 and v4>65 where f3is a focal length of the third lens group G3, f4is the focal length of the fourth lens group, v4is an average of Abbe contrasts of all the convex lens pieces in the fourth lens group G4.

REFERENCES:
patent: 5612825 (1997-03-01), Horiuchi et al.
patent: 7245442 (2007-07-01), Ohtake
patent: 7248417 (2007-07-01), Miyazawa
patent: 7616386 (2009-11-01), Kimura
patent: 2007-003776 (2007-01-01), None
patent: 2007-127694 (2007-05-01), None
patent: 2007-212847 (2007-08-01), None

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