Compact zoom lens system

Details Compact zoom lens system Compact zoom lens system

2007-05-01

2007-05-01

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S680000, C359S682000, C359S683000, C359S684000, C359S685000, C359S686000, C359S715000, C359S740000, C359S741000, C359S743000, C359S753000, C359S781000, C359S783000

Reexamination Certificate

active

11463231

ABSTRACT:
A compact zoom lens system includes, from the object side to the image side, a negative first lens group (1), a positive second lens group (2), a positive third lens group (3) and a positive fourth lens group (4). The first lens group is stationary, and both the second and third lens groups are movable for effecting focal length change. The fourth lens group is also movable to compensate for image plane shift due to focal length change and thereby maintain the position of the image plane. The compact zoom lens system has a significantly reduced lens count and thus has an overall length of only 20 mm while achieving an approximately 3× zoom ratio. Sufficient back focal length is ensured even for such a short overall length. By employing aspheric lenses (10, 20, 301, 31, 41) for aberration correction, a high level of optical performance can be ensured.

REFERENCES:
patent: 6191896 (2001-02-01), Itoh
patent: 6233099 (2001-05-01), Itoh
patent: 6650486 (2003-11-01), Chen
patent: 6816320 (2004-11-01), Wada
patent: 6885506 (2005-04-01), Yoneyama
patent: 2003/0012567 (2003-01-01), Itoh
patent: 2004/0012860 (2004-01-01), Wada

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