US Patent 10231873 Auto darkening mask

An auto darkening mask which has a weld cap and a filter mechanism, wherein the filter mechanism includes a lens module, a connecting line and a regulating system; and the weld cap is provided with a visible window. The lens module is assembled inside the weld cap and is opposite to the visible window of the weld cap. The regulating system protrudes out of an outer side of the weld cap and is connected with the weld cap, and the lens module is connected with and controlled by the regulating system through the connecting line.