Zoom lens

Details Zoom lens Zoom lens

2008-01-08

2008-01-08

Thompson, Timothy J. (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S772000

Reexamination Certificate

active

07317584

ABSTRACT:
A zoom lens for imaging an image onto a photosensitive element includes a first lens group, a second lens group, a third lens group and a fourth lens group. The second lens group is located and suitable for moving between the first lens group and the third lens group; the fourth lens group is located and suitable for moving between the third lens group and the photosensitive element. The first lens group, the second lens group, the third lens group, and the fourth lens group have a positive refractive power, a negative refractive power, a positive refractive power and a positive refractive power, respectively. Besides, the third lens group includes at least a hybrid lens and the second lens group includes at least an aspheric lens, the number of the aspheric lens is smaller than or equal to 2. Thus, manufacturing cost of the zoom lens mentioned above is lower.

REFERENCES:
patent: 6259508 (2001-07-01), Shigematsu
patent: 6718132 (2004-04-01), Nishina
patent: 2006/0072213 (2006-04-01), Shibayama et al.

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