Linear vibrator
View Patent ↗There is provided a linear vibrator including: a housing having an internal space formed therein; a magnetic field unit including a yoke disposed in the internal space, a magnet mounted on a surface of the yoke, and a yoke plate formed on a surface opposite to a contact surface between the magnet and the yoke; a coil interacting with the magnetic field unit to allow the magnetic field unit to move linearly when power is applied thereto, and forming a movement space for the magnetic field unit; magnetic fluid provided in a clearance between the magnetic field unit and the coil and alleviating contact impact between the magnetic field unit and the coil; and a contact avoiding unit formed on at least one of the magnetic field unit and the coil and avoiding a contact between the magnetic field unit and the coil due to an external impact.
1. A linear vibrator comprising:
a housing having an internal space formed therein;
a magnetic field unit including a yoke disposed in the internal space, a magnet mounted on a surface of the yoke, and a yoke plate formed on a surface opposite to a contact surface between the magnet and the yoke;
a coil interacting with the magnetic field unit to allow the magnetic field unit to move linearly when power is applied thereto, and forming a movement space for the magnetic field unit;
magnetic fluid provided in a clearance between the magnetic field unit and the coil and alleviating contact impact between the magnetic field unit and the coil; and
a contact avoiding unit formed on at least one of the magnetic field unit and the coil and avoiding a contact between the magnetic field unit and the coil due to an external impact.
2. The linear vibrator of claim 1 , wherein the contact avoiding unit is formed by chamfering the yoke plate, and
a length of the contact surface between the yoke plate and the magnet is longer than that of a non-contact surface opposite to the contact surface.
3. The linear vibrator of claim 1 , wherein the housing includes a cylindrical upper case of which a lower portion is open and a bracket closing the lower portion of the upper case and having a coil mounted thereon.
4. The linear vibrator of claim 3 , wherein a movement space of the coil corresponding to a position of the yoke plate is larger than a vibration space in which the coil is formed at a position corresponding to a lower portion of the yoke plate in a vibration stop state.
5. The linear vibrator of claim 1 , wherein the yoke comprises:
a flat part having the magnet mounted thereon;
a mass body fixing part being bent from the flat part in a mounting direction of the magnet to fix a mass body; and
a claw part being bent from the mass body fixing part to support a bottom of the mass body.
6. The linear vibrator of claim 1 , wherein the housing includes a damper formed on a surface thereof, the damper preventing the magnetic field unit from contacting the housing due to vibration.