Patent ID: 6539097
Filing Date: 2003-03-25
Classification: B06B,H04R

Abstract:
A multi-functional vibration actuator comprising:a vibration transmitting portion forming a peripheral portion of said actuator, a magnetic circuit comprising a permanent magnet and a magnetic yoke, said magnetic circuit having a magnetic gap therein, and said magnetic curcuit having first and second surfaces opposite to each other, a vibrator member arranged at a distance from said first surface of said magnetic circuit and having an outer periphery fixed to said vibration transmitting portion, a coil arranged in said gap within said magnetic circuit at a distance from said magnetic circuit and fixedly attached to said vibrator member, and a suspension fixed to said vibration transmitting portion and flexibly supporting said magnetic circuit, wherein a cover is fixedly mounted to said vibration transmitting portion and covers said second surface of said magnetic circuit with a space left between said cover and said second surface of said magnetic circuit, wherein the distance between said vibrator member and said first surface of said magnetic circuit is greater than the space between the second surface of said magnetic circuit and said cover, and wherein said vibration transmitting portion is provided with at least one stopper for preventing said magnetic circuit from being brought into contact with said vibrator member due to an excessive amplitude.