Optical unit, image taking apparatus and optical finder

Details Optical unit, image taking apparatus and optical finder Optical unit, image taking apparatus and optical finder

2007-09-04

2007-09-04

Spector, David N. (Department: 2873)

Optical: systems and elements

Lens

Fluid

C359S665000

Reexamination Certificate

active

11214756

ABSTRACT:
An optical unit capable of freely changing the refractive power and operating with a reduced deterioration in performance, an image taking apparatus having an image taking lens using the optical unit, and an optical finder using the optical unit. The optical unit includes a lens body having an electromagnetic field generator which changes the focal length of the lens body by moving, by an electromagnetic force, a dispersoid which is dispersed in a light-transmissive dispersion medium enclosed in a container, which is light-transmissive, and which has a refractive index different from the refractive index of the dispersion medium. The optical unit also includes a focal length changing section which changes the focal length of the lens body in three steps by controlling an electromagnetic field generated by the electromagnetic field generator.

REFERENCES:
patent: 7180678 (2007-02-01), Kato et al.
patent: 7212329 (2007-05-01), Ito et al.
patent: 7215480 (2007-05-01), Ito et al.
patent: 2006/0044448 (2006-03-01), Kato et al.
patent: 2006/0050402 (2006-03-01), Ito et al.
patent: 2006/0056008 (2006-03-01), Ito et al.
patent: 2002-341311 (2002-11-01), None
“Philips Fluid Lenses”, Digital Photography Review, www.dpreview.com, 2 pages.

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