Piezoelectric speaker

Abstract

Abstract PURPOSE:To ensure the insulation of lead wires, to improve sound pressure and to facilitate a connection by laminating alternately a dish type diaphragm having its rising part near its circumference and a flat diaphragm with a piezoelectric element clipped inbetween, forming a throughhole to the rising part of the dish diaphragm and forming a projection to the flat diaphragm for use of an electric connection terminal. CONSTITUTION:A throughole 7 is provided to the rising part 4 of the dish diaphragm 6 having a flange 5. Moreover, a flat metal-made diaphragm 9 having a projection 8 at a part of the outer circumference smaller in diameter than that of the dish diaphragm 6 is provided. Both the diaphragms 6, 9 are laminated so as to make three piezoelectric elements 3 adjacent to each other alternately in a way that the notch for throughhole 7 and projection 8 are made correspondent to each other, Then the exposed electrode 2 of the piezoelectric element 3 at both outer faces and the other diaphragm at one interval are connected by lead wires 11a, 11b and lead wires 12, 13 are connected to both the diaphragms 6, 9 to constitute a multi-layer sounding body. Thus, the lead wires are connected easily without incurring careless short-circuit.

Inventors

• 👤 Kazuaki Hirai

Bibliographic Details