The present invention is directed to a method of call rejection provided for use in connection with a data network. Next, a p-type region is formed immediately below the recess by implanting impurities into an imaging region using the hard mask material film as a mask. , by irradiating only one laser beam. Each heat pipe comprises three portions, respectively orderly sandwiched between the base and the heat dissipating fins, sandwiched between the cover and the heat dissipating fins and thermally extending in the cooling fins.