Zoom Lens Design for a Slim Mobile Camera Using Liquid Lens

Abstract

In this study, we have designed a two-group inner-focus zoom lens system using a prism and a liquid lens and we evaluated that zoom system. By xing the rst group, the inner-focus zoom system has the same total track at all zoom positions and the advantage of mechanical size, which is useful for a slim mobile camera. To acquire a slim and compact zoom system, we directly inserted a right-angle prism of 5.5 mm in thickness in front of the rst lens group. Specially, the second group of the zoom system is placed into a liquid lens whose power is varied to maintain the image plane at di erent magni cations. This variable power can be acquired by changing the curvature between the oil and the water in a passive device. In conclusion, the focal length range of this zoom lens is 4.3 mm to 12.90 mm and the aperture is F/3 at a wide position and F/5 at a tele position. This design procedure resulted in a slim zoom lens system useful for a mobile camera.