US Patent 9880441 Electrochromic systems for head-worn computer systems

Embodiments include a head-worn computer, comprising: a removable lens, wherein the removable lens comprises an electrochromic layer adapted to transition between at least two states of transparency level dependent on an electrical condition applied to the electrochromatic layer; a variable-power magnetic-electrode mounted on the head-worn computer; and a magnetic element mounted in the removable lens, wherein the magnetic element is positioned behind the electrochromic layer and aligned to mate with the variable-power magnetic-electrode such that, when the lens is mounted, the variable-power magnetic-electrode and the magnetic element physically attract to one another making an electrical connection between the variable-power magnetic-electrode and an electrically conductive layer of the electrochromic layer.