| Summary: | 碩士 === 國立交通大學 === 光電工程學系 === 99 === An electrically-tunable optical zoom system using composite liquid crystal (LC) lenses is demonstrated. The main mechanism of electrically tunable focal length of composite LC lenses results from the gradient distribution of refractive indices owning to the orientations of LC directors. In this thesis, we start from analyzing the imaging conditions and the magnification of the optical zoom system. Based on the developed relation between the focusing properties of LC lenses and zoom ratio of the optical zoom system, we developed a composite LC lens consisting of a sub-LC lens and a built-in planar polymeric lens in order to shift negative lens power when the composite LC lens is operated as a negative lens. The electrically-tunable optical zoom system using composite LC lenses has high zoom ratio (~7.9:1), short system length (<10cm) and the object can be zoomed in or zoomed out continuously at the objective distance of infinity to 10 cm. The applications of the optical zoom system using composite LC lenses are also demonstrated in this thesis, such as pico-projectors and webcams.
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