A composite strip 10 windable to form a helical pipe is disclosed. An anode lead is also electrically connected to the anode body and extends therefrom, The capacitor and leadframe are enclosed and hermetically sealed within a ceramic housing in the presence of an inert gas. When output values obtained when a document on AF line is read by a line sensor are represented by LS1, LS2, LS3,. The third pan member is coupled to the first and second pan members.