Patent ID: 8133031

Claim:
A lightning protection device of a windmill blade comprising: a lightning receptor set at an outer surface of the blade; a connection equipment including lead wires laid through an inside of the blade and a windmill body or bypass brushes for conducting a lightning current from the receptor through the connection equipment and discharging the lightning current into the ground; a base plate made of an electrically conductive material embedded in an internal space of a tip end part of the blade; and an adhesive filled in the internal space of the tip end part of the blade for embedding the base plate therein; wherein the receptor is fixed to the base plate piercing through side shells of the blade and the adhesive such that a part of the receptor is exposed at the outer surface of the blade, the lead wires are connected to the base plate via a connection terminal part, and the internal space of the blade filled with the adhesive is an inside space between a belly side shell and a back side shell of the tip end part of the blade in which a main beam frame for reinforcement is not present, the main beam frame being embedded in the blade to extend in a lengthwise direction of the blade from a root part of the blade, and air in the inside space of the blade is removed by the adhesive in the inside space.