| 摘要 |
PURPOSE:To contrive the decrease in a cost through reduction of the number of parts and assembling processes, by a method wherein an impact force is storaged and the one end of a hammer spring for guiding a voltage to the outside is protruded from a cylindrical case. CONSTITUTION:An impact pad 4, a piezo-electric element 2 and a support metal 3 are inserted through one end of a cylindrical case 9 to secure them therein. A hammer 5, having a hammer pin 6, is inserted through the other end of the cylindrical case, and a hammer spring 10 having a voltage fetching part 10a, which guides a voltage to the cylindrical case 9 and is projected from the case 9, is inserted therein, and the end, on the voltage fetching part 10a side of the hammer spring 10, of the case 9 is attached to a piezo-electric device mounting part 11. This enables fetching of a voltage without using a voltage fetching plate, enables elimination of the voltage fetching plate and a process, in which the voltage fetching plate is inserted, and permits reduction of a cost. |
