Stepwise variable zoom lens system

Details Stepwise variable zoom lens system Stepwise variable zoom lens system

2006-12-05

2006-12-05

Schwartz, Jordan M. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S683000

Reexamination Certificate

active

07145731

ABSTRACT:
A stepwise variable zoom lens system for creating an image of a scene on an image sensor includes a first lens unit which has a positive refracting power, an aperture, a second lens unit which has a positive refracting power, and a third lens unit which has a negative refracting power. Each of the first, the second and the third lens units is constructed from a single block. The third lens unit is fixed. The first and the second lens units are selectively positioned in a first position and a second position, and the position is changed from one to the other by moving the first and the second lens units in opposite direction.

REFERENCES:
patent: 5087988 (1992-02-01), Nakayama
patent: 6853503 (2005-02-01), Nomura et al.
patent: 2002/0191305 (2002-12-01), Nagatoshi

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