Miniature zoom lens

Details Miniature zoom lens Miniature zoom lens

2006-11-14

2006-11-14

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S680000

Reexamination Certificate

active

07136232

ABSTRACT:
A miniature zoom lens has, sequentially from an object side, a first lens group G1having negative refractive power, a second lens group G2having positive refractive power and including a diaphragm, and a third lens group G3having positive refractive power. The first lens group G1is formed from a single negative lens L1. The second lens group G2is formed from, sequentially from the object side, a single positive lens L2and a single negative lens L3.The third lens group G3is formed form a single positive lens L4. The first lens group G1is immovable and the second lens group G2and the third lens group G3move in an optical axis direction at variable power. The miniature zoom lens provides a large zoom ratio while keeping a constant total length.

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Patent Abstracts of Japan, vol. 2002, No. 07, Jul. 3, 2002 & JP 2002 072095 A (Minolta Co. Ltd.), Mar. 12, 2002.
Patent Abstracts of Japan, vol. 2003, No. 12, Dec. 5, 2003 & JP 2004 070235 A (Minolta Co. Ltd.) Mar. 4, 2004.

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