Zoom lens

Details Zoom lens Zoom lens

2008-01-08

2008-01-08

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

Fluid

C359S676000, C359S683000, C359S684000, C359S685000, C359S686000, C359S689000, C359S692000, C359S708000, C359S740000, C359S721000, C359S737000, C359S713000, C359S714000, C359S715000, C359S716000, C359S717000

Reexamination Certificate

active

11077035

ABSTRACT:
In this invention, to provide a compact zoom lens having a small number of optical element groups to be driven and a simple moving mechanism, at least one of a plurality of optical element groups arranged in the lens system includes a refractive power variable element of a transmission type which has a compensation function to correct focus movement caused by zooming and a focus function to correct focus movement caused by a variation in inter-object distance. The refractive power variable element is a liquid optical element including a first liquid having a conductivity or a polarity and a second liquid which is not mixed with the first liquid, the first liquid and the second liquid being enclosed in a container fluid-tight so as to define an interface therebetween having a predetermined shape, the liquid optical element being arranged such that a refractive power thereof is adjusted by changing a curvature of the interface.

REFERENCES:
patent: 4407567 (1983-10-01), Michelet et al.
patent: 4784479 (1988-11-01), Ikemori
patent: 2002/0176148 (2002-11-01), Onuki et al.
patent: 59-116711 (1984-07-01), None
patent: 2002-350726 (2002-12-01), None
patent: 2003-098435 (2003-04-01), None

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