Zoom lens

Details Zoom lens Zoom lens

2007-12-18

2007-12-18

Mack, Ricky (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S683000

Reexamination Certificate

active

11283549

ABSTRACT:
A zoom lens is equipped with: a first lens group having an overall negative refractive power and a second lens group having an overall positive refractive power in sequence from the object side to the image plane side. Zoom magnification is changed from a wide-angle end to a telephoto end by moving the first lens group to the image plane side and then reversing the motion to the object side while the second lens group is moved to the object side. The condition (1) 0.90<=(DG1+DG2)/fw<=2.30 and the condition (2) 0.5<=|fG1|/fG2<=1.6 are met, where DG1is the thickness of the first lens group; DG2is the thickness of the second lens group; fw is the focal length of the lens system at the wide-angle and; fG1is the focal length of the first lens group; and fG2is the focal length of the second lens group. With above structure, the power arrangements for the first and second lens groups are set appropriately providing a zoom magnification ratio of approximately 3× beside making the design of the zoon lens compact and thin.

REFERENCES:
patent: 5329402 (1994-07-01), Sato
patent: 6275342 (2001-08-01), Sakamoto et al.
patent: 2006/0238890 (2006-10-01), Nanba et al.
patent: 8-254653 (1996-10-01), None
patent: 9-166749 (1997-06-01), None
patent: 9-211325 (1997-08-01), None
patent: 10-253882 (1998-09-01), None
Patent Abstracts of Japan for JP9-166749 published Jun. 24, 1997.
Patent Abstracts of Japan for JP9-211325 published Aug. 15, 1997.
Patent Abstracts of Japan for JP8-254653 published Oct. 1, 1996.
Patent Abstracts of Japan for JP10-253882 published Sep. 25, 1998.

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