Quote:<div>It’s the first time I see such an “electric lens” patent from Sony. It describes a zoom lens having normal optical elements and in the center two liquid crystal lenses. The liquid crystal lenses can change the “refractive index” with the use of electric signal. Sony writes:
 
To achieve miniaturization of the optical system, it is conceivable to use what is called a liquid crystal lens, in which liquid crystal is disposed between two planar lens substrates. This is because by applying an electrical signal to the liquid crystal to vary the refractive index of the liquid crystal, it becomes possible to vary the focal length of the lens without moving the lens itself.