Fluidic Lens of PDMS Membrane Driven by Voice-Coil and Magnet

This letter presents a fluidic lens whose power can be rapidly adjusted. It is fabricated using a polydimethylsiloxane (PDMS) membrane combined with a ring-shaped magnet to form a single lens. The actuating force of this lens is generated by a voice-coil that exerts magnetic force onto the ring-shaped magnet, which moves upward and downward on the optical axis. It shows improved controllability that is smooth and fast, with a higher plus optical power than the current liquid lens of PDMS membrane. The focal length is measured to be 25 D, and demonstrates clearness by showing images captured by a digital camera.