A Japanese blogger, called Egami, has allowed us to become aware of a new patent Canon , which has for its object the creation of a lens “liquid” . The idea is not innovative in itself (for example, there are industrial applications, such as those Varioptic): have already been presented solutions that use two liquids, so as to form a lens through the use of the barrier that is created between the two fluids. Modulating the intensity of the electrical current, applied to fluids, it is possible to modify the curvature of the liquid lens, thereby obtaining, as a result, the operation useful within a camera.
The solution developed by Canon, although based on the same principle (referred electrowetting ), differs considerably from the above: the patent involves the use of a series of parallel electrodes , places around the edges of the lens . These electrodes form a sort of micro-pumps individually controllable . Piloting selectively micro-pumps you can get a much more accurate on the curvature of the lens, allowing also to achieve greater stability.
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The system has a function substantially binary (on / off), and its effectiveness based on the use of the desired number of micro-pumps in succession, which makes this solution also very fast. Looking at the patent can be seen that Canon seems to have well-developed this idea , having also thought to solutions developed for the design of the lenses (for example, micro-pumps with equilateral triangular according to a concentric ring). At the moment among the applications most likely are those in the branch of video surveillance or as part of smartphones.
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