Dual range focus element

Details Dual range focus element Dual range focus element

2008-09-25

2010-12-14

Wong, Tina M (Department: 2874)

Liquid crystal cells, elements and systems

Liquid crystal optical element

Liquid crystal lenses other than for eyewear

C359S742000

Reexamination Certificate

active

07852454

ABSTRACT:
An autofocus system is provided for image capture that includes a liquid crystal focus lens which includes a dual range liquid crystal lens with a thinner liquid crystal lens (385) and a thicker liquid crystal lens (365) separated by a single shared electrode (370). Wherein the thinner liquid crystal lens (385) has a smaller optical power and a faster response time and the thicker liquid crystal lens (365) has a larger optical power and a slower response time. The autofocus system has a focusing effect that is produced by the combined optical power of the thinner liquid crystal lens and the thicker liquid crystal lens. A method for focusing an image capture device and an image capture device are also described.

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Thesis by Emil Halstaad, Uppsala University, Acta Universitatis Uppsaliesis, Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, 1048, 71pp, ISBN 91-554-6110-7), 2004.

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