Variable-focus lens and image taking apparatus

Details Variable-focus lens and image taking apparatus Variable-focus lens and image taking apparatus

2007-05-08

2007-05-08

Spector, David N. (Department: 2873)

Optical: systems and elements

Lens

Fluid

C359S665000

Reexamination Certificate

active

11213741

ABSTRACT:
The present invention provides a variable-focus lens capable of freely changing the refractive power and operating with a reduced deterioration in performance and an image taking apparatus having a focal-length-variable image taking lens including the variable-focus lens. The variable-focus lens includes: a lens body having an electromagnetic field generator which changes the focal length of the light passage region by moving, by an electromagnetic force, light-transmissive nanoparticles which are dispersed in a light-transmissive dispersion medium enclosed in a container having the shape of a lens, and which have a refractive index different from the refractive index of the dispersion medium; a moving mechanism which moves the lens body in an optical axis direction; and a focal length adjustment section which changes the focal length of the lens body by controlling an electromagnetic field generated by the electromagnetic field generator.

REFERENCES:
patent: 7180678 (2007-02-01), Kato et al.
patent: 2006/0044448 (2006-03-01), Kato et al.
patent: 2006/0050412 (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 Bring Things Into Focus, Digital Photography Review, www.dpreview.com, Mar. 3, 2004.

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