Piezo-electric push button switch

A piezo-electric push button switch comprising:

• a housing having a plurality of terminals embedded therein;
• a depressing member which is movably mounted in said housing;
• a flexible printed circuit board in said housing which electrically is conductively secured to said terminals for being mounted thereon;
• an electrically conductive plate in said housing between said circuit board and said depressing member and having a plate part and a lead part, said lead part being electrically conductively secured to said flexible printed circuit board;
• a piezo-electric plate which has electrodes on both surfaces thereof and is polarized in the direction of the thickness thereof, said piezo-electric plate being fixedly secured to the surface of said electrically conductive plate which is toward said circuit board;
• a further lead part between said flexible printed circuit board and said electrode on said piezo-electric plate which is toward said flexible circuit board and mechanically and electrically conductively connecting said electrode and said circuit board;
• and
• striking means constituted by a dome-shaped metal spring and interposed between said depressing member and said electrically conductive plate and which is deformed by depression of said depressing member to thereby strike a blow on said electrically conductive plate.