[OPTICAL REVIEW Vol. 12, No. 3 (2005) 255-259]
© 2005 The Optical Society of Japan
Electrowetting-Based Variable-Focus Lens for Miniature Systems
B. H. W. HENDRIKS, S. KUIPER, M. A. J. VAN AS, C. A. RENDERS and T. W. TUKKER
Philips Research Laboratories, Prof. Holstlaan 4, 5656 AA Eindhoven, The Netherlands
(Received October 12, 2004; Accepted April 8, 2005)
The meniscus between two immiscible liquids of different refractive indices can be used as a lens. A change in curvature of this meniscus by electrostatic control of the solid/liquid interfacial tension leads to a change in focal distance. It is demonstrated that two liquids in a tube form a self-centred variable-focus lens. The optical properties of this lens were investigated experimentally. We designed and constructed a miniature camera module based on this variable lens suitable for mobile applications. Furthermore, the liquid lens was applied in a Blu-ray Disc optical recording system to enable dual layer disc reading/writing.
Key words: liquid lens, electrowetting, camera, optical recording