BONE CONDUCTION VIBRATOR

摘要

A bone conduction vibrator which can increase an output efficiency and achieve a wide-band frequency is disclosed. The bone conduction vibrator comprises a frame which is formed in a cylindrical shape and has opened upper and lower ends; a base plate which is fixed into the opened lower end of the frame; an amateur which includes an annular rim having a certain thickness and fixed into the opened upper end of the frame and a circular vibrating plate coupled to an inner circumference of the rim in a state of stepped down to a certain depth, and for controling a frequency band according to a diameter, thickness and material of the vibrating plate; a yoke which includes a circular body portion for supporting the amateur and an extended portion extended downwardly integrally along the outer circumference of the body portion, and for concentrating magnetic flux; a magnet which is mounted inside the extended portion of the yoke and an upper surface of which contacts integrally with a lower surface of the body portion of the yoke; an upper plate which is mounted inside the extended portion of the yoke, an upper surface of which contacts integrally with a lower surface of the magnet, and for forming a magnetic circuit with the magnet and the yoke; and a voice coil which is located in a gap between an outer circumference of the upper plate and an inner circumference of the extended portion of the yoke, and a lower end of which is mounted fixedly on the base plate. Further, circular plate-shaped cushion members adhere to an upper surface of the vibrating plate of the amateur and a lower surface of the base plate, respectively.a