In this paper, we proposed an ultra slim optical zoom system with Alvarez freeform lenses. A 3X optical zoom system with two pairs of Alvarez lenses was developed. Alvarez lenses are fabricated by precise injection molding and the movable elements are actuated by voice coil motors. A slim camera module was fabricated with a size of 25 mm(width)×25 mm(length)×6 mm(height). The zooming and imaging capabilities of this Alvarez zoom system are demonstrated experimentally. The prototype exhibits a promising future for space-constrained application such as mobile phone camera module, wearable imaging system and endoscopic system.
This study focuses on the corrosion resistance of Cobalt–Chromium (Co–Cr) alloy coated with Silver/Zirconium (Ag/Zr) nanocomposite coatings, using plasma spraying. The Ag/Zr nanocomposite materials are processed into nanoparticles with a range of diameters from 22 μm
to 58 μm, because small particle size increases the adhesion between the anti-corrosion Ag/Zr nanocomposite coating and the Co–Cr alloy substrate, which can prevent oxygen from penetrating into the Co–Cr alloy substrate. The samples of Ag/Zr nanocomposite coating effectively
diminished the number of microholes and cracks, as well as preserved the substrate's flexibility. We recommend using the Ag8Zr2 coating for medical applications because it had the highest corrosion resistance of all the samples we tested.
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