Adaptive Lens Inspired by Bio-Visual Systems
Final rept. 20 Aug 2002-19 Aug 2004
CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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During the DARPA BOSS I program, the UCSD team has made substantial progress in the following areas a We have identified and demonstrated the merits of PDMS elastomer for lens membranes. The PDMS-based fluidic lens process has been proven to be simple, controllable, and scalable to form lenses from 10 urn to several centimeters in diameter. b We have demonstrated fluidic tunable lenses with an exceedingly wide tuning range and strong lens power. Most tunable lenses that have been demonstrated today can only achieve a large f-number or weak lens powerin the order of 10 to 15. Our tunable lens is the first and only device that can achieve an f-number of 0.7 and an extremely wide tuning range from f 0.7 to 100. The strong lens power and the wide tuning range are the keys to many superior and unique functions of imaging systems. c We have successfully extended the single-chamber fluidic lens structure into multi-chamber lens structures. As a result, one can not only achieve a wide tuning range in focal distance, f-number, and numerical aperture, but also obtain the extreme structure can be transformed into any of the following structures plano-convex, plano-concave, double-convex, double-concave, positive-meniscus, and negative-miniscus, reversibly.