Patent ID: 6600938
Filing Date: 2003-07-29
Classification: B06B,H04R

Abstract:
A vibration actuator (37,53,57,61,63) comprising:a drive section (39) comprising a magnetic circuit (19) with a magnetic gap and a coil (29) placed in the magnetic gap; a vibrator (45) driven by said drive section; an external plate member (49,59,65,91) spaced from said vibrator (45); and a spacer (43) disposed between said vibrator (45) and said external plate member (49, 59, 65, 91) and having an end portion supporting a peripheral edge portion of said vibrator (45) and an opposite end portion supporting said external plate member (49, 59, 65, 91), wherein said spacer (43) is a tubular member so that a closed space (51) is defined by said vibrator (45), said spacer (43) and said external plate member (49, 59, 65, 91) to form an acoustic space based on the Helmholtz's resonance principle.